Merge branch 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs updates from David Sterba:
 "The changes range through all types: cleanups, core chagnes, sanity
  checks, fixes, other user visible changes, detailed list below:

   - deprecated: user transaction ioctl

   - mount option ssd does not change allocation alignments

   - degraded read-write mount is allowed if all the raid profile
     constraints are met, now based on more accurate check

   - defrag: do not reset compression afterwards; the NOCOMPRESS flag
     can be now overriden by defrag

   - prep work for better extent reference tracking (related to the
     qgroup slowness with balance)

   - prep work for compression heuristics

   - memory allocation reductions (may help latencies on a loaded
     system)

   - better accounting for io waiting states

   - error handling improvements (removed BUGs)

   - added more sanity checks for shared refs

   - fix readdir vs pagefault deadlock under some circumstances

   - fix for 'no-hole' mode, certain combination of compressed and
     inline extents

   - send: fix emission of invalid clone operations

   - fixup file mode if setting acls fail

   - more fixes from fuzzing

   - oher cleanups"

* 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (104 commits)
  btrfs: submit superblock io with REQ_META and REQ_PRIO
  btrfs: remove unnecessary memory barrier in btrfs_direct_IO
  btrfs: remove superfluous chunk_tree argument from btrfs_alloc_dev_extent
  btrfs: Remove chunk_objectid parameter of btrfs_alloc_dev_extent
  btrfs: pass fs_info to btrfs_del_root instead of tree_root
  Btrfs: add one more sanity check for shared ref type
  Btrfs: remove BUG_ON in __add_tree_block
  Btrfs: remove BUG() in add_data_reference
  Btrfs: remove BUG() in print_extent_item
  Btrfs: remove BUG() in btrfs_extent_inline_ref_size
  Btrfs: convert to use btrfs_get_extent_inline_ref_type
  Btrfs: add a helper to retrive extent inline ref type
  btrfs: scrub: simplify scrub worker initialization
  btrfs: scrub: clean up division in scrub_find_csum
  btrfs: scrub: clean up division in __scrub_mark_bitmap
  btrfs: scrub: use bool for flush_all_writes
  btrfs: preserve i_mode if __btrfs_set_acl() fails
  btrfs: Remove extraneous chunk_objectid variable
  btrfs: Remove chunk_objectid argument from btrfs_make_block_group
  btrfs: Remove extra parentheses from condition in copy_items()
  ...

39 files changed, 1502 insertions, 1409 deletions

diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c
index 8d8370ddb6b2..1ba49ebe67da 100644
--- a/fs/btrfs/acl.c
+++ b/fs/btrfs/acl.c
@@ -114,13 +114,17 @@ out:
 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 {
 	int ret;
+	umode_t old_mode = inode->i_mode;
 
 	if (type == ACL_TYPE_ACCESS && acl) {
 		ret = posix_acl_update_mode(inode, &inode->i_mode, &acl);
 		if (ret)
 			return ret;
 	}
-	return __btrfs_set_acl(NULL, inode, acl, type);
+	ret = __btrfs_set_acl(NULL, inode, acl, type);
+	if (ret)
+		inode->i_mode = old_mode;
+	return ret;
 }
 
 /*
diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c
index ff0b0be92d61..e00c8a9fd5bb 100644
--- a/fs/btrfs/async-thread.c
+++ b/fs/btrfs/async-thread.c
@@ -75,18 +75,18 @@ void btrfs_##name(struct work_struct *arg)				\
 }
 
 struct btrfs_fs_info *
-btrfs_workqueue_owner(struct __btrfs_workqueue *wq)
+btrfs_workqueue_owner(const struct __btrfs_workqueue *wq)
 {
 	return wq->fs_info;
 }
 
 struct btrfs_fs_info *
-btrfs_work_owner(struct btrfs_work *work)
+btrfs_work_owner(const struct btrfs_work *work)
 {
 	return work->wq->fs_info;
 }
 
-bool btrfs_workqueue_normal_congested(struct btrfs_workqueue *wq)
+bool btrfs_workqueue_normal_congested(const struct btrfs_workqueue *wq)
 {
 	/*
 	 * We could compare wq->normal->pending with num_online_cpus()
diff --git a/fs/btrfs/async-thread.h b/fs/btrfs/async-thread.h
index 1f9597355c9d..fc957e00cef1 100644
--- a/fs/btrfs/async-thread.h
+++ b/fs/btrfs/async-thread.h
@@ -82,7 +82,7 @@ void btrfs_queue_work(struct btrfs_workqueue *wq,
 void btrfs_destroy_workqueue(struct btrfs_workqueue *wq);
 void btrfs_workqueue_set_max(struct btrfs_workqueue *wq, int max);
 void btrfs_set_work_high_priority(struct btrfs_work *work);
-struct btrfs_fs_info *btrfs_work_owner(struct btrfs_work *work);
-struct btrfs_fs_info *btrfs_workqueue_owner(struct __btrfs_workqueue *wq);
-bool btrfs_workqueue_normal_congested(struct btrfs_workqueue *wq);
+struct btrfs_fs_info *btrfs_work_owner(const struct btrfs_work *work);
+struct btrfs_fs_info *btrfs_workqueue_owner(const struct __btrfs_workqueue *wq);
+bool btrfs_workqueue_normal_congested(const struct btrfs_workqueue *wq);
 #endif
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index f723c11bb763..b517ef1477ea 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -18,6 +18,7 @@
 
 #include <linux/mm.h>
 #include <linux/rbtree.h>
+#include <trace/events/btrfs.h>
 #include "ctree.h"
 #include "disk-io.h"
 #include "backref.h"
@@ -26,11 +27,6 @@
 #include "delayed-ref.h"
 #include "locking.h"
 
-enum merge_mode {
-	MERGE_IDENTICAL_KEYS = 1,
-	MERGE_IDENTICAL_PARENTS,
-};
-
 /* Just an arbitrary number so we can be sure this happened */
 #define BACKREF_FOUND_SHARED 6
 
@@ -40,269 +36,11 @@ struct extent_inode_elem {
 	struct extent_inode_elem *next;
 };
 
-/*
- * ref_root is used as the root of the ref tree that hold a collection
- * of unique references.
- */
-struct ref_root {
-	struct rb_root rb_root;
-
-	/*
-	 * The unique_refs represents the number of ref_nodes with a positive
-	 * count stored in the tree. Even if a ref_node (the count is greater
-	 * than one) is added, the unique_refs will only increase by one.
-	 */
-	unsigned int unique_refs;
-};
-
-/* ref_node is used to store a unique reference to the ref tree. */
-struct ref_node {
-	struct rb_node rb_node;
-
-	/* For NORMAL_REF, otherwise all these fields should be set to 0 */
-	u64 root_id;
-	u64 object_id;
-	u64 offset;
-
-	/* For SHARED_REF, otherwise parent field should be set to 0 */
-	u64 parent;
-
-	/* Ref to the ref_mod of btrfs_delayed_ref_node */
-	int ref_mod;
-};
-
-/* Dynamically allocate and initialize a ref_root */
-static struct ref_root *ref_root_alloc(void)
-{
-	struct ref_root *ref_tree;
-
-	ref_tree = kmalloc(sizeof(*ref_tree), GFP_NOFS);
-	if (!ref_tree)
-		return NULL;
-
-	ref_tree->rb_root = RB_ROOT;
-	ref_tree->unique_refs = 0;
-
-	return ref_tree;
-}
-
-/* Free all nodes in the ref tree, and reinit ref_root */
-static void ref_root_fini(struct ref_root *ref_tree)
-{
-	struct ref_node *node;
-	struct rb_node *next;
-
-	while ((next = rb_first(&ref_tree->rb_root)) != NULL) {
-		node = rb_entry(next, struct ref_node, rb_node);
-		rb_erase(next, &ref_tree->rb_root);
-		kfree(node);
-	}
-
-	ref_tree->rb_root = RB_ROOT;
-	ref_tree->unique_refs = 0;
-}
-
-static void ref_root_free(struct ref_root *ref_tree)
-{
-	if (!ref_tree)
-		return;
-
-	ref_root_fini(ref_tree);
-	kfree(ref_tree);
-}
-
-/*
- * Compare ref_node with (root_id, object_id, offset, parent)
- *
- * The function compares two ref_node a and b. It returns an integer less
- * than, equal to, or greater than zero , respectively, to be less than, to
- * equal, or be greater than b.
- */
-static int ref_node_cmp(struct ref_node *a, struct ref_node *b)
-{
-	if (a->root_id < b->root_id)
-		return -1;
-	else if (a->root_id > b->root_id)
-		return 1;
-
-	if (a->object_id < b->object_id)
-		return -1;
-	else if (a->object_id > b->object_id)
-		return 1;
-
-	if (a->offset < b->offset)
-		return -1;
-	else if (a->offset > b->offset)
-		return 1;
-
-	if (a->parent < b->parent)
-		return -1;
-	else if (a->parent > b->parent)
-		return 1;
-
-	return 0;
-}
-
-/*
- * Search ref_node with (root_id, object_id, offset, parent) in the tree
- *
- * if found, the pointer of the ref_node will be returned;
- * if not found, NULL will be returned and pos will point to the rb_node for
- * insert, pos_parent will point to pos'parent for insert;
-*/
-static struct ref_node *__ref_tree_search(struct ref_root *ref_tree,
-					  struct rb_node ***pos,
-					  struct rb_node **pos_parent,
-					  u64 root_id, u64 object_id,
-					  u64 offset, u64 parent)
-{
-	struct ref_node *cur = NULL;
-	struct ref_node entry;
-	int ret;
-
-	entry.root_id = root_id;
-	entry.object_id = object_id;
-	entry.offset = offset;
-	entry.parent = parent;
-
-	*pos = &ref_tree->rb_root.rb_node;
-
-	while (**pos) {
-		*pos_parent = **pos;
-		cur = rb_entry(*pos_parent, struct ref_node, rb_node);
-
-		ret = ref_node_cmp(cur, &entry);
-		if (ret > 0)
-			*pos = &(**pos)->rb_left;
-		else if (ret < 0)
-			*pos = &(**pos)->rb_right;
-		else
-			return cur;
-	}
-
-	return NULL;
-}
-
-/*
- * Insert a ref_node to the ref tree
- * @pos used for specifiy the position to insert
- * @pos_parent for specifiy pos's parent
- *
- * success, return 0;
- * ref_node already exists, return -EEXIST;
-*/
-static int ref_tree_insert(struct ref_root *ref_tree, struct rb_node **pos,
-			   struct rb_node *pos_parent, struct ref_node *ins)
-{
-	struct rb_node **p = NULL;
-	struct rb_node *parent = NULL;
-	struct ref_node *cur = NULL;
-
-	if (!pos) {
-		cur = __ref_tree_search(ref_tree, &p, &parent, ins->root_id,
-					ins->object_id, ins->offset,
-					ins->parent);
-		if (cur)
-			return -EEXIST;
-	} else {
-		p = pos;
-		parent = pos_parent;
-	}
-
-	rb_link_node(&ins->rb_node, parent, p);
-	rb_insert_color(&ins->rb_node, &ref_tree->rb_root);
-
-	return 0;
-}
-
-/* Erase and free ref_node, caller should update ref_root->unique_refs */
-static void ref_tree_remove(struct ref_root *ref_tree, struct ref_node *node)
-{
-	rb_erase(&node->rb_node, &ref_tree->rb_root);
-	kfree(node);
-}
-
-/*
- * Update ref_root->unique_refs
- *
- * Call __ref_tree_search
- *	1. if ref_node doesn't exist, ref_tree_insert this node, and update
- *	ref_root->unique_refs:
- *		if ref_node->ref_mod > 0, ref_root->unique_refs++;
- *		if ref_node->ref_mod < 0, do noting;
- *
- *	2. if ref_node is found, then get origin ref_node->ref_mod, and update
- *	ref_node->ref_mod.
- *		if ref_node->ref_mod is equal to 0,then call ref_tree_remove
- *
- *		according to origin_mod and new_mod, update ref_root->items
- *		+----------------+--------------+-------------+
- *		|		 |new_count <= 0|new_count > 0|
- *		+----------------+--------------+-------------+
- *		|origin_count < 0|       0      |      1      |
- *		+----------------+--------------+-------------+
- *		|origin_count > 0|      -1      |      0      |
- *		+----------------+--------------+-------------+
- *
- * In case of allocation failure, -ENOMEM is returned and the ref_tree stays
- * unaltered.
- * Success, return 0
- */
-static int ref_tree_add(struct ref_root *ref_tree, u64 root_id, u64 object_id,
-			u64 offset, u64 parent, int count)
-{
-	struct ref_node *node = NULL;
-	struct rb_node **pos = NULL;
-	struct rb_node *pos_parent = NULL;
-	int origin_count;
-	int ret;
-
-	if (!count)
-		return 0;
-
-	node = __ref_tree_search(ref_tree, &pos, &pos_parent, root_id,
-				 object_id, offset, parent);
-	if (node == NULL) {
-		node = kmalloc(sizeof(*node), GFP_NOFS);
-		if (!node)
-			return -ENOMEM;
-
-		node->root_id = root_id;
-		node->object_id = object_id;
-		node->offset = offset;
-		node->parent = parent;
-		node->ref_mod = count;
-
-		ret = ref_tree_insert(ref_tree, pos, pos_parent, node);
-		ASSERT(!ret);
-		if (ret) {
-			kfree(node);
-			return ret;
-		}
-
-		ref_tree->unique_refs += node->ref_mod > 0 ? 1 : 0;
-
-		return 0;
-	}
-
-	origin_count = node->ref_mod;
-	node->ref_mod += count;
-
-	if (node->ref_mod > 0)
-		ref_tree->unique_refs += origin_count > 0 ? 0 : 1;
-	else if (node->ref_mod <= 0)
-		ref_tree->unique_refs += origin_count > 0 ? -1 : 0;
-
-	if (!node->ref_mod)
-		ref_tree_remove(ref_tree, node);
-
-	return 0;
-}
-
-static int check_extent_in_eb(struct btrfs_key *key, struct extent_buffer *eb,
-				struct btrfs_file_extent_item *fi,
-				u64 extent_item_pos,
-				struct extent_inode_elem **eie)
+static int check_extent_in_eb(const struct btrfs_key *key,
+			      const struct extent_buffer *eb,
+			      const struct btrfs_file_extent_item *fi,
+			      u64 extent_item_pos,
+			      struct extent_inode_elem **eie)
 {
 	u64 offset = 0;
 	struct extent_inode_elem *e;
@@ -344,9 +82,9 @@ static void free_inode_elem_list(struct extent_inode_elem *eie)
 	}
 }
 
-static int find_extent_in_eb(struct extent_buffer *eb, u64 wanted_disk_byte,
-				u64 extent_item_pos,
-				struct extent_inode_elem **eie)
+static int find_extent_in_eb(const struct extent_buffer *eb,
+			     u64 wanted_disk_byte, u64 extent_item_pos,
+			     struct extent_inode_elem **eie)
 {
 	u64 disk_byte;
 	struct btrfs_key key;
@@ -383,26 +121,44 @@ static int find_extent_in_eb(struct extent_buffer *eb, u64 wanted_disk_byte,
 	return 0;
 }
 
+struct preftree {
+	struct rb_root root;
+	unsigned int count;
+};
+
+#define PREFTREE_INIT	{ .root = RB_ROOT, .count = 0 }
+
+struct preftrees {
+	struct preftree direct;    /* BTRFS_SHARED_[DATA|BLOCK]_REF_KEY */
+	struct preftree indirect;  /* BTRFS_[TREE_BLOCK|EXTENT_DATA]_REF_KEY */
+	struct preftree indirect_missing_keys;
+};
+
 /*
- * this structure records all encountered refs on the way up to the root
+ * Checks for a shared extent during backref search.
+ *
+ * The share_count tracks prelim_refs (direct and indirect) having a
+ * ref->count >0:
+ *  - incremented when a ref->count transitions to >0
+ *  - decremented when a ref->count transitions to <1
  */
-struct __prelim_ref {
-	struct list_head list;
-	u64 root_id;
-	struct btrfs_key key_for_search;
-	int level;
-	int count;
-	struct extent_inode_elem *inode_list;
-	u64 parent;
-	u64 wanted_disk_byte;
+struct share_check {
+	u64 root_objectid;
+	u64 inum;
+	int share_count;
 };
 
+static inline int extent_is_shared(struct share_check *sc)
+{
+	return (sc && sc->share_count > 1) ? BACKREF_FOUND_SHARED : 0;
+}
+
 static struct kmem_cache *btrfs_prelim_ref_cache;
 
 int __init btrfs_prelim_ref_init(void)
 {
 	btrfs_prelim_ref_cache = kmem_cache_create("btrfs_prelim_ref",
-					sizeof(struct __prelim_ref),
+					sizeof(struct prelim_ref),
 					0,
 					SLAB_MEM_SPREAD,
 					NULL);
@@ -416,6 +172,134 @@ void btrfs_prelim_ref_exit(void)
 	kmem_cache_destroy(btrfs_prelim_ref_cache);
 }
 
+static void free_pref(struct prelim_ref *ref)
+{
+	kmem_cache_free(btrfs_prelim_ref_cache, ref);
+}
+
+/*
+ * Return 0 when both refs are for the same block (and can be merged).
+ * A -1 return indicates ref1 is a 'lower' block than ref2, while 1
+ * indicates a 'higher' block.
+ */
+static int prelim_ref_compare(struct prelim_ref *ref1,
+			      struct prelim_ref *ref2)
+{
+	if (ref1->level < ref2->level)
+		return -1;
+	if (ref1->level > ref2->level)
+		return 1;
+	if (ref1->root_id < ref2->root_id)
+		return -1;
+	if (ref1->root_id > ref2->root_id)
+		return 1;
+	if (ref1->key_for_search.type < ref2->key_for_search.type)
+		return -1;
+	if (ref1->key_for_search.type > ref2->key_for_search.type)
+		return 1;
+	if (ref1->key_for_search.objectid < ref2->key_for_search.objectid)
+		return -1;
+	if (ref1->key_for_search.objectid > ref2->key_for_search.objectid)
+		return 1;
+	if (ref1->key_for_search.offset < ref2->key_for_search.offset)
+		return -1;
+	if (ref1->key_for_search.offset > ref2->key_for_search.offset)
+		return 1;
+	if (ref1->parent < ref2->parent)
+		return -1;
+	if (ref1->parent > ref2->parent)
+		return 1;
+
+	return 0;
+}
+
+void update_share_count(struct share_check *sc, int oldcount, int newcount)
+{
+	if ((!sc) || (oldcount == 0 && newcount < 1))
+		return;
+
+	if (oldcount > 0 && newcount < 1)
+		sc->share_count--;
+	else if (oldcount < 1 && newcount > 0)
+		sc->share_count++;
+}
+
+/*
+ * Add @newref to the @root rbtree, merging identical refs.
+ *
+ * Callers should assume that newref has been freed after calling.
+ */
+static void prelim_ref_insert(const struct btrfs_fs_info *fs_info,
+			      struct preftree *preftree,
+			      struct prelim_ref *newref,
+			      struct share_check *sc)
+{
+	struct rb_root *root;
+	struct rb_node **p;
+	struct rb_node *parent = NULL;
+	struct prelim_ref *ref;
+	int result;
+
+	root = &preftree->root;
+	p = &root->rb_node;
+
+	while (*p) {
+		parent = *p;
+		ref = rb_entry(parent, struct prelim_ref, rbnode);
+		result = prelim_ref_compare(ref, newref);
+		if (result < 0) {
+			p = &(*p)->rb_left;
+		} else if (result > 0) {
+			p = &(*p)->rb_right;
+		} else {
+			/* Identical refs, merge them and free @newref */
+			struct extent_inode_elem *eie = ref->inode_list;
+
+			while (eie && eie->next)
+				eie = eie->next;
+
+			if (!eie)
+				ref->inode_list = newref->inode_list;
+			else
+				eie->next = newref->inode_list;
+			trace_btrfs_prelim_ref_merge(fs_info, ref, newref,
+						     preftree->count);
+			/*
+			 * A delayed ref can have newref->count < 0.
+			 * The ref->count is updated to follow any
+			 * BTRFS_[ADD|DROP]_DELAYED_REF actions.
+			 */
+			update_share_count(sc, ref->count,
+					   ref->count + newref->count);
+			ref->count += newref->count;
+			free_pref(newref);
+			return;
+		}
+	}
+
+	update_share_count(sc, 0, newref->count);
+	preftree->count++;
+	trace_btrfs_prelim_ref_insert(fs_info, newref, NULL, preftree->count);
+	rb_link_node(&newref->rbnode, parent, p);
+	rb_insert_color(&newref->rbnode, root);
+}
+
+/*
+ * Release the entire tree.  We don't care about internal consistency so
+ * just free everything and then reset the tree root.
+ */
+static void prelim_release(struct preftree *preftree)
+{
+	struct prelim_ref *ref, *next_ref;
+
+	rbtree_postorder_for_each_entry_safe(ref, next_ref, &preftree->root,
+					     rbnode)
+		free_pref(ref);
+
+	preftree->root = RB_ROOT;
+	preftree->count = 0;
+}
+
 /*
  * the rules for all callers of this function are:
  * - obtaining the parent is the goal
@@ -448,19 +332,19 @@ void btrfs_prelim_ref_exit(void)
  *
  * - column 1, 3: we've the parent -> done
  * - column 2:    we take the first key from the block to find the parent
- *                (see __add_missing_keys)
+ *                (see add_missing_keys)
  * - column 4:    we use the key to find the parent
  *
  * additional information that's available but not required to find the parent
  * block might help in merging entries to gain some speed.
  */
-
-static int __add_prelim_ref(struct list_head *head, u64 root_id,
-			    struct btrfs_key *key, int level,
-			    u64 parent, u64 wanted_disk_byte, int count,
-			    gfp_t gfp_mask)
+static int add_prelim_ref(const struct btrfs_fs_info *fs_info,
+			  struct preftree *preftree, u64 root_id,
+			  const struct btrfs_key *key, int level, u64 parent,
+			  u64 wanted_disk_byte, int count,
+			  struct share_check *sc, gfp_t gfp_mask)
 {
-	struct __prelim_ref *ref;
+	struct prelim_ref *ref;
 
 	if (root_id == BTRFS_DATA_RELOC_TREE_OBJECTID)
 		return 0;
@@ -503,13 +387,37 @@ static int __add_prelim_ref(struct list_head *head, u64 root_id,
 	ref->count = count;
 	ref->parent = parent;
 	ref->wanted_disk_byte = wanted_disk_byte;
-	list_add_tail(&ref->list, head);
+	prelim_ref_insert(fs_info, preftree, ref, sc);
+	return extent_is_shared(sc);
+}
 
-	return 0;
+/* direct refs use root == 0, key == NULL */
+static int add_direct_ref(const struct btrfs_fs_info *fs_info,
+			  struct preftrees *preftrees, int level, u64 parent,
+			  u64 wanted_disk_byte, int count,
+			  struct share_check *sc, gfp_t gfp_mask)
+{
+	return add_prelim_ref(fs_info, &preftrees->direct, 0, NULL, level,
+			      parent, wanted_disk_byte, count, sc, gfp_mask);
+}
+
+/* indirect refs use parent == 0 */
+static int add_indirect_ref(const struct btrfs_fs_info *fs_info,
+			    struct preftrees *preftrees, u64 root_id,
+			    const struct btrfs_key *key, int level,
+			    u64 wanted_disk_byte, int count,
+			    struct share_check *sc, gfp_t gfp_mask)
+{
+	struct preftree *tree = &preftrees->indirect;
+
+	if (!key)
+		tree = &preftrees->indirect_missing_keys;
+	return add_prelim_ref(fs_info, tree, root_id, key, level, 0,
+			      wanted_disk_byte, count, sc, gfp_mask);
 }
 
 static int add_all_parents(struct btrfs_root *root, struct btrfs_path *path,
-			   struct ulist *parents, struct __prelim_ref *ref,
+			   struct ulist *parents, struct prelim_ref *ref,
 			   int level, u64 time_seq, const u64 *extent_item_pos,
 			   u64 total_refs)
 {
@@ -599,11 +507,10 @@ next:
  * resolve an indirect backref in the form (root_id, key, level)
  * to a logical address
  */
-static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
-				  struct btrfs_path *path, u64 time_seq,
-				  struct __prelim_ref *ref,
-				  struct ulist *parents,
-				  const u64 *extent_item_pos, u64 total_refs)
+static int resolve_indirect_ref(struct btrfs_fs_info *fs_info,
+				struct btrfs_path *path, u64 time_seq,
+				struct prelim_ref *ref, struct ulist *parents,
+				const u64 *extent_item_pos, u64 total_refs)
 {
 	struct btrfs_root *root;
 	struct btrfs_key root_key;
@@ -681,52 +588,90 @@ out:
 	return ret;
 }
 
+static struct extent_inode_elem *
+unode_aux_to_inode_list(struct ulist_node *node)
+{
+	if (!node)
+		return NULL;
+	return (struct extent_inode_elem *)(uintptr_t)node->aux;
+}
+
 /*
- * resolve all indirect backrefs from the list
+ * We maintain three seperate rbtrees: one for direct refs, one for
+ * indirect refs which have a key, and one for indirect refs which do not
+ * have a key. Each tree does merge on insertion.
+ *
+ * Once all of the references are located, we iterate over the tree of
+ * indirect refs with missing keys. An appropriate key is located and
+ * the ref is moved onto the tree for indirect refs. After all missing
+ * keys are thus located, we iterate over the indirect ref tree, resolve
+ * each reference, and then insert the resolved reference onto the
+ * direct tree (merging there too).
+ *
+ * New backrefs (i.e., for parent nodes) are added to the appropriate
+ * rbtree as they are encountered. The new backrefs are subsequently
+ * resolved as above.
  */
-static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
-				   struct btrfs_path *path, u64 time_seq,
-				   struct list_head *head,
-				   const u64 *extent_item_pos, u64 total_refs,
-				   u64 root_objectid)
+static int resolve_indirect_refs(struct btrfs_fs_info *fs_info,
+				 struct btrfs_path *path, u64 time_seq,
+				 struct preftrees *preftrees,
+				 const u64 *extent_item_pos, u64 total_refs,
+				 struct share_check *sc)
 {
 	int err;
 	int ret = 0;
-	struct __prelim_ref *ref;
-	struct __prelim_ref *ref_safe;
-	struct __prelim_ref *new_ref;
 	struct ulist *parents;
 	struct ulist_node *node;
 	struct ulist_iterator uiter;
+	struct rb_node *rnode;
 
 	parents = ulist_alloc(GFP_NOFS);
 	if (!parents)
 		return -ENOMEM;
 
 	/*
-	 * _safe allows us to insert directly after the current item without
-	 * iterating over the newly inserted items.
-	 * we're also allowed to re-assign ref during iteration.
+	 * We could trade memory usage for performance here by iterating
+	 * the tree, allocating new refs for each insertion, and then
+	 * freeing the entire indirect tree when we're done.  In some test
+	 * cases, the tree can grow quite large (~200k objects).
 	 */
-	list_for_each_entry_safe(ref, ref_safe, head, list) {
-		if (ref->parent)	/* already direct */
-			continue;
-		if (ref->count == 0)
+	while ((rnode = rb_first(&preftrees->indirect.root))) {
+		struct prelim_ref *ref;
+
+		ref = rb_entry(rnode, struct prelim_ref, rbnode);
+		if (WARN(ref->parent,
+			 "BUG: direct ref found in indirect tree")) {
+			ret = -EINVAL;
+			goto out;
+		}
+
+		rb_erase(&ref->rbnode, &preftrees->indirect.root);
+		preftrees->indirect.count--;
+
+		if (ref->count == 0) {
+			free_pref(ref);
 			continue;
-		if (root_objectid && ref->root_id != root_objectid) {
+		}
+
+		if (sc && sc->root_objectid &&
+		    ref->root_id != sc->root_objectid) {
+			free_pref(ref);
 			ret = BACKREF_FOUND_SHARED;
 			goto out;
 		}
-		err = __resolve_indirect_ref(fs_info, path, time_seq, ref,
-					     parents, extent_item_pos,
-					     total_refs);
+		err = resolve_indirect_ref(fs_info, path, time_seq, ref,
+					   parents, extent_item_pos,
+					   total_refs);
 		/*
 		 * we can only tolerate ENOENT,otherwise,we should catch error
 		 * and return directly.
 		 */
 		if (err == -ENOENT) {
+			prelim_ref_insert(fs_info, &preftrees->direct, ref,
+					  NULL);
 			continue;
 		} else if (err) {
+			free_pref(ref);
 			ret = err;
 			goto out;
 		}
@@ -735,68 +680,65 @@ static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
 		ULIST_ITER_INIT(&uiter);
 		node = ulist_next(parents, &uiter);
 		ref->parent = node ? node->val : 0;
-		ref->inode_list = node ?
-			(struct extent_inode_elem *)(uintptr_t)node->aux : NULL;
+		ref->inode_list = unode_aux_to_inode_list(node);
 
-		/* additional parents require new refs being added here */
+		/* Add a prelim_ref(s) for any other parent(s). */
 		while ((node = ulist_next(parents, &uiter))) {
+			struct prelim_ref *new_ref;
+
 			new_ref = kmem_cache_alloc(btrfs_prelim_ref_cache,
 						   GFP_NOFS);
 			if (!new_ref) {
+				free_pref(ref);
 				ret = -ENOMEM;
 				goto out;
 			}
 			memcpy(new_ref, ref, sizeof(*ref));
 			new_ref->parent = node->val;
-			new_ref->inode_list = (struct extent_inode_elem *)
-							(uintptr_t)node->aux;
-			list_add(&new_ref->list, &ref->list);
+			new_ref->inode_list = unode_aux_to_inode_list(node);
+			prelim_ref_insert(fs_info, &preftrees->direct,
+					  new_ref, NULL);
 		}
+
+		/*
+		 * Now it's a direct ref, put it in the the direct tree. We must
+		 * do this last because the ref could be merged/freed here.
+		 */
+		prelim_ref_insert(fs_info, &preftrees->direct, ref, NULL);
+
 		ulist_reinit(parents);
+		cond_resched();
 	}
 out:
 	ulist_free(parents);
 	return ret;
 }
 
-static inline int ref_for_same_block(struct __prelim_ref *ref1,
-				     struct __prelim_ref *ref2)
-{
-	if (ref1->level != ref2->level)
-		return 0;
-	if (ref1->root_id != ref2->root_id)
-		return 0;
-	if (ref1->key_for_search.type != ref2->key_for_search.type)
-		return 0;
-	if (ref1->key_for_search.objectid != ref2->key_for_search.objectid)
-		return 0;
-	if (ref1->key_for_search.offset != ref2->key_for_search.offset)
-		return 0;
-	if (ref1->parent != ref2->parent)
-		return 0;
-
-	return 1;
-}
-
 /*
  * read tree blocks and add keys where required.
  */
-static int __add_missing_keys(struct btrfs_fs_info *fs_info,
-			      struct list_head *head)
+static int add_missing_keys(struct btrfs_fs_info *fs_info,
+			    struct preftrees *preftrees)
 {
-	struct __prelim_ref *ref;
+	struct prelim_ref *ref;
 	struct extent_buffer *eb;
+	struct preftree *tree = &preftrees->indirect_missing_keys;
+	struct rb_node *node;
 
-	list_for_each_entry(ref, head, list) {
-		if (ref->parent)
-			continue;
-		if (ref->key_for_search.type)
-			continue;
+	while ((node = rb_first(&tree->root))) {
+		ref = rb_entry(node, struct prelim_ref, rbnode);
+		rb_erase(node, &tree->root);
+
+		BUG_ON(ref->parent);	/* should not be a direct ref */
+		BUG_ON(ref->key_for_search.type);
 		BUG_ON(!ref->wanted_disk_byte);
+
 		eb = read_tree_block(fs_info, ref->wanted_disk_byte, 0);
 		if (IS_ERR(eb)) {
+			free_pref(ref);
 			return PTR_ERR(eb);
 		} else if (!extent_buffer_uptodate(eb)) {
+			free_pref(ref);
 			free_extent_buffer(eb);
 			return -EIO;
 		}
@@ -807,73 +749,33 @@ static int __add_missing_keys(struct btrfs_fs_info *fs_info,
 			btrfs_node_key_to_cpu(eb, &ref->key_for_search, 0);
 		btrfs_tree_read_unlock(eb);
 		free_extent_buffer(eb);
+		prelim_ref_insert(fs_info, &preftrees->indirect, ref, NULL);
+		cond_resched();
 	}
 	return 0;
 }
 
 /*
- * merge backrefs and adjust counts accordingly
- *
- *    FIXME: For MERGE_IDENTICAL_KEYS, if we add more keys in __add_prelim_ref
- *           then we can merge more here. Additionally, we could even add a key
- *           range for the blocks we looked into to merge even more (-> replace
- *           unresolved refs by those having a parent).
- */
-static void __merge_refs(struct list_head *head, enum merge_mode mode)
-{
-	struct __prelim_ref *pos1;
-
-	list_for_each_entry(pos1, head, list) {
-		struct __prelim_ref *pos2 = pos1, *tmp;
-
-		list_for_each_entry_safe_continue(pos2, tmp, head, list) {
-			struct __prelim_ref *ref1 = pos1, *ref2 = pos2;
-			struct extent_inode_elem *eie;
-
-			if (!ref_for_same_block(ref1, ref2))
-				continue;
-			if (mode == MERGE_IDENTICAL_KEYS) {
-				if (!ref1->parent && ref2->parent)
-					swap(ref1, ref2);
-			} else {
-				if (ref1->parent != ref2->parent)
-					continue;
-			}
-
-			eie = ref1->inode_list;
-			while (eie && eie->next)
-				eie = eie->next;
-			if (eie)
-				eie->next = ref2->inode_list;
-			else
-				ref1->inode_list = ref2->inode_list;
-			ref1->count += ref2->count;
-
-			list_del(&ref2->list);
-			kmem_cache_free(btrfs_prelim_ref_cache, ref2);
-			cond_resched();
-		}
-
-	}
-}
-
-/*
  * add all currently queued delayed refs from this head whose seq nr is
  * smaller or equal that seq to the list
  */
-static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
-			      struct list_head *prefs, u64 *total_refs,
-			      u64 inum)
+static int add_delayed_refs(const struct btrfs_fs_info *fs_info,
+			    struct btrfs_delayed_ref_head *head, u64 seq,
+			    struct preftrees *preftrees, u64 *total_refs,
+			    struct share_check *sc)
 {
 	struct btrfs_delayed_ref_node *node;
 	struct btrfs_delayed_extent_op *extent_op = head->extent_op;
 	struct btrfs_key key;
-	struct btrfs_key op_key = {0};
-	int sgn;
+	struct btrfs_key tmp_op_key;
+	struct btrfs_key *op_key = NULL;
+	int count;
 	int ret = 0;
 
-	if (extent_op && extent_op->update_key)
-		btrfs_disk_key_to_cpu(&op_key, &extent_op->key);
+	if (extent_op && extent_op->update_key) {
+		btrfs_disk_key_to_cpu(&tmp_op_key, &extent_op->key);
+		op_key = &tmp_op_key;
+	}
 
 	spin_lock(&head->lock);
 	list_for_each_entry(node, &head->ref_list, list) {
@@ -886,36 +788,40 @@ static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
 			WARN_ON(1);
 			continue;
 		case BTRFS_ADD_DELAYED_REF:
-			sgn = 1;
+			count = node->ref_mod;
 			break;
 		case BTRFS_DROP_DELAYED_REF:
-			sgn = -1;
+			count = node->ref_mod * -1;
 			break;
 		default:
 			BUG_ON(1);
 		}
-		*total_refs += (node->ref_mod * sgn);
+		*total_refs += count;
 		switch (node->type) {
 		case BTRFS_TREE_BLOCK_REF_KEY: {
+			/* NORMAL INDIRECT METADATA backref */
 			struct btrfs_delayed_tree_ref *ref;
 
 			ref = btrfs_delayed_node_to_tree_ref(node);
-			ret = __add_prelim_ref(prefs, ref->root, &op_key,
-					       ref->level + 1, 0, node->bytenr,
-					       node->ref_mod * sgn, GFP_ATOMIC);
+			ret = add_indirect_ref(fs_info, preftrees, ref->root,
+					       &tmp_op_key, ref->level + 1,
+					       node->bytenr, count, sc,
+					       GFP_ATOMIC);
 			break;
 		}
 		case BTRFS_SHARED_BLOCK_REF_KEY: {
+			/* SHARED DIRECT METADATA backref */
 			struct btrfs_delayed_tree_ref *ref;
 
 			ref = btrfs_delayed_node_to_tree_ref(node);
-			ret = __add_prelim_ref(prefs, 0, NULL,
-					       ref->level + 1, ref->parent,
-					       node->bytenr,
-					       node->ref_mod * sgn, GFP_ATOMIC);
+
+			ret = add_direct_ref(fs_info, preftrees, ref->level + 1,
+					     ref->parent, node->bytenr, count,
+					     sc, GFP_ATOMIC);
 			break;
 		}
 		case BTRFS_EXTENT_DATA_REF_KEY: {
+			/* NORMAL INDIRECT DATA backref */
 			struct btrfs_delayed_data_ref *ref;
 			ref = btrfs_delayed_node_to_data_ref(node);
 
@@ -927,42 +833,53 @@ static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
 			 * Found a inum that doesn't match our known inum, we
 			 * know it's shared.
 			 */
-			if (inum && ref->objectid != inum) {
+			if (sc && sc->inum && ref->objectid != sc->inum) {
 				ret = BACKREF_FOUND_SHARED;
-				break;
+				goto out;
 			}
 
-			ret = __add_prelim_ref(prefs, ref->root, &key, 0, 0,
-					       node->bytenr,
-					       node->ref_mod * sgn, GFP_ATOMIC);
+			ret = add_indirect_ref(fs_info, preftrees, ref->root,
+					       &key, 0, node->bytenr, count, sc,
+					       GFP_ATOMIC);
 			break;
 		}
 		case BTRFS_SHARED_DATA_REF_KEY: {
+			/* SHARED DIRECT FULL backref */
 			struct btrfs_delayed_data_ref *ref;
 
 			ref = btrfs_delayed_node_to_data_ref(node);
-			ret = __add_prelim_ref(prefs, 0, NULL, 0,
-					       ref->parent, node->bytenr,
-					       node->ref_mod * sgn, GFP_ATOMIC);
+
+			ret = add_direct_ref(fs_info, preftrees, 0, ref->parent,
+					     node->bytenr, count, sc,
+					     GFP_ATOMIC);
 			break;
 		}
 		default:
 			WARN_ON(1);
 		}
-		if (ret)
+		/*
+		 * We must ignore BACKREF_FOUND_SHARED until all delayed
+		 * refs have been checked.
+		 */
+		if (ret && (ret != BACKREF_FOUND_SHARED))
 			break;
 	}
+	if (!ret)
+		ret = extent_is_shared(sc);
+out:
 	spin_unlock(&head->lock);
 	return ret;
 }
 
 /*
  * add all inline backrefs for bytenr to the list
+ *
+ * Returns 0 on success, <0 on error, or BACKREF_FOUND_SHARED.
  */
-static int __add_inline_refs(struct btrfs_path *path, u64 bytenr,
-			     int *info_level, struct list_head *prefs,
-			     struct ref_root *ref_tree,
-			     u64 *total_refs, u64 inum)
+static int add_inline_refs(const struct btrfs_fs_info *fs_info,
+			   struct btrfs_path *path, u64 bytenr,
+			   int *info_level, struct preftrees *preftrees,
+			   u64 *total_refs, struct share_check *sc)
 {
 	int ret = 0;
 	int slot;
@@ -1012,14 +929,18 @@ static int __add_inline_refs(struct btrfs_path *path, u64 bytenr,
 		int type;
 
 		iref = (struct btrfs_extent_inline_ref *)ptr;
-		type = btrfs_extent_inline_ref_type(leaf, iref);
+		type = btrfs_get_extent_inline_ref_type(leaf, iref,
+							BTRFS_REF_TYPE_ANY);
+		if (type == BTRFS_REF_TYPE_INVALID)
+			return -EINVAL;
+
 		offset = btrfs_extent_inline_ref_offset(leaf, iref);
 
 		switch (type) {
 		case BTRFS_SHARED_BLOCK_REF_KEY:
-			ret = __add_prelim_ref(prefs, 0, NULL,
-						*info_level + 1, offset,
-						bytenr, 1, GFP_NOFS);
+			ret = add_direct_ref(fs_info, preftrees,
+					     *info_level + 1, offset,
+					     bytenr, 1, NULL, GFP_NOFS);
 			break;
 		case BTRFS_SHARED_DATA_REF_KEY: {
 			struct btrfs_shared_data_ref *sdref;
@@ -1027,21 +948,15 @@ static int __add_inline_refs(struct btrfs_path *path, u64 bytenr,
 
 			sdref = (struct btrfs_shared_data_ref *)(iref + 1);
 			count = btrfs_shared_data_ref_count(leaf, sdref);
-			ret = __add_prelim_ref(prefs, 0, NULL, 0, offset,
-					       bytenr, count, GFP_NOFS);
-			if (ref_tree) {
-				if (!ret)
-					ret = ref_tree_add(ref_tree, 0, 0, 0,
-							   bytenr, count);
-				if (!ret && ref_tree->unique_refs > 1)
-					ret = BACKREF_FOUND_SHARED;
-			}
+
+			ret = add_direct_ref(fs_info, preftrees, 0, offset,
+					     bytenr, count, sc, GFP_NOFS);
 			break;
 		}
 		case BTRFS_TREE_BLOCK_REF_KEY:
-			ret = __add_prelim_ref(prefs, offset, NULL,
-					       *info_level + 1, 0,
-					       bytenr, 1, GFP_NOFS);
+			ret = add_indirect_ref(fs_info, preftrees, offset,
+					       NULL, *info_level + 1,
+					       bytenr, 1, NULL, GFP_NOFS);
 			break;
 		case BTRFS_EXTENT_DATA_REF_KEY: {
 			struct btrfs_extent_data_ref *dref;
@@ -1055,23 +970,16 @@ static int __add_inline_refs(struct btrfs_path *path, u64 bytenr,
 			key.type = BTRFS_EXTENT_DATA_KEY;
 			key.offset = btrfs_extent_data_ref_offset(leaf, dref);
 
-			if (inum && key.objectid != inum) {
+			if (sc && sc->inum && key.objectid != sc->inum) {
 				ret = BACKREF_FOUND_SHARED;
 				break;
 			}
 
 			root = btrfs_extent_data_ref_root(leaf, dref);
-			ret = __add_prelim_ref(prefs, root, &key, 0, 0,
-					       bytenr, count, GFP_NOFS);
-			if (ref_tree) {
-				if (!ret)
-					ret = ref_tree_add(ref_tree, root,
-							   key.objectid,
-							   key.offset, 0,
-							   count);
-				if (!ret && ref_tree->unique_refs > 1)
-					ret = BACKREF_FOUND_SHARED;
-			}
+
+			ret = add_indirect_ref(fs_info, preftrees, root,
+					       &key, 0, bytenr, count,
+					       sc, GFP_NOFS);
 			break;
 		}
 		default:
@@ -1087,11 +995,13 @@ static int __add_inline_refs(struct btrfs_path *path, u64 bytenr,
 
 /*
  * add all non-inline backrefs for bytenr to the list
+ *
+ * Returns 0 on success, <0 on error, or BACKREF_FOUND_SHARED.
  */
-static int __add_keyed_refs(struct btrfs_fs_info *fs_info,
-			    struct btrfs_path *path, u64 bytenr,
-			    int info_level, struct list_head *prefs,
-			    struct ref_root *ref_tree, u64 inum)
+static int add_keyed_refs(struct btrfs_fs_info *fs_info,
+			  struct btrfs_path *path, u64 bytenr,
+			  int info_level, struct preftrees *preftrees,
+			  struct share_check *sc)
 {
 	struct btrfs_root *extent_root = fs_info->extent_root;
 	int ret;
@@ -1121,34 +1031,32 @@ static int __add_keyed_refs(struct btrfs_fs_info *fs_info,
 
 		switch (key.type) {
 		case BTRFS_SHARED_BLOCK_REF_KEY:
-			ret = __add_prelim_ref(prefs, 0, NULL,
-						info_level + 1, key.offset,
-						bytenr, 1, GFP_NOFS);
+			/* SHARED DIRECT METADATA backref */
+			ret = add_direct_ref(fs_info, preftrees,
+					     info_level + 1, key.offset,
+					     bytenr, 1, NULL, GFP_NOFS);
 			break;
 		case BTRFS_SHARED_DATA_REF_KEY: {
+			/* SHARED DIRECT FULL backref */
 			struct btrfs_shared_data_ref *sdref;
 			int count;
 
 			sdref = btrfs_item_ptr(leaf, slot,
 					      struct btrfs_shared_data_ref);
 			count = btrfs_shared_data_ref_count(leaf, sdref);
-			ret = __add_prelim_ref(prefs, 0, NULL, 0, key.offset,
-						bytenr, count, GFP_NOFS);
-			if (ref_tree) {
-				if (!ret)
-					ret = ref_tree_add(ref_tree, 0, 0, 0,
-							   bytenr, count);
-				if (!ret && ref_tree->unique_refs > 1)
-					ret = BACKREF_FOUND_SHARED;
-			}
+			ret = add_direct_ref(fs_info, preftrees, 0,
+					     key.offset, bytenr, count,
+					     sc, GFP_NOFS);
 			break;
 		}
 		case BTRFS_TREE_BLOCK_REF_KEY:
-			ret = __add_prelim_ref(prefs, key.offset, NULL,
-					       info_level + 1, 0,
-					       bytenr, 1, GFP_NOFS);
+			/* NORMAL INDIRECT METADATA backref */
+			ret = add_indirect_ref(fs_info, preftrees, key.offset,
+					       NULL, info_level + 1, bytenr,
+					       1, NULL, GFP_NOFS);
 			break;
 		case BTRFS_EXTENT_DATA_REF_KEY: {
+			/* NORMAL INDIRECT DATA backref */
 			struct btrfs_extent_data_ref *dref;
 			int count;
 			u64 root;
@@ -1161,23 +1069,15 @@ static int __add_keyed_refs(struct btrfs_fs_info *fs_info,
 			key.type = BTRFS_EXTENT_DATA_KEY;
 			key.offset = btrfs_extent_data_ref_offset(leaf, dref);
 
-			if (inum && key.objectid != inum) {
+			if (sc && sc->inum && key.objectid != sc->inum) {
 				ret = BACKREF_FOUND_SHARED;
 				break;
 			}
 
 			root = btrfs_extent_data_ref_root(leaf, dref);
-			ret = __add_prelim_ref(prefs, root, &key, 0, 0,
-					       bytenr, count, GFP_NOFS);
-			if (ref_tree) {
-				if (!ret)
-					ret = ref_tree_add(ref_tree, root,
-							   key.objectid,
-							   key.offset, 0,
-							   count);
-				if (!ret && ref_tree->unique_refs > 1)
-					ret = BACKREF_FOUND_SHARED;
-			}
+			ret = add_indirect_ref(fs_info, preftrees, root,
+					       &key, 0, bytenr, count,
+					       sc, GFP_NOFS);
 			break;
 		}
 		default:
@@ -1197,15 +1097,15 @@ static int __add_keyed_refs(struct btrfs_fs_info *fs_info,
  * indirect refs to their parent bytenr.
  * When roots are found, they're added to the roots list
  *
- * NOTE: This can return values > 0
- *
  * If time_seq is set to SEQ_LAST, it will not search delayed_refs, and behave
  * much like trans == NULL case, the difference only lies in it will not
  * commit root.
  * The special case is for qgroup to search roots in commit_transaction().
  *
- * If check_shared is set to 1, any extent has more than one ref item, will
- * be returned BACKREF_FOUND_SHARED immediately.
+ * @sc - if !NULL, then immediately return BACKREF_FOUND_SHARED when a
+ * shared extent is detected.
+ *
+ * Otherwise this returns 0 for success and <0 for an error.
  *
  * FIXME some caching might speed things up
  */
@@ -1213,7 +1113,7 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
 			     struct btrfs_fs_info *fs_info, u64 bytenr,
 			     u64 time_seq, struct ulist *refs,
 			     struct ulist *roots, const u64 *extent_item_pos,
-			     u64 root_objectid, u64 inum, int check_shared)
+			     struct share_check *sc)
 {
 	struct btrfs_key key;
 	struct btrfs_path *path;
@@ -1221,15 +1121,16 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
 	struct btrfs_delayed_ref_head *head;
 	int info_level = 0;
 	int ret;
-	struct list_head prefs_delayed;
-	struct list_head prefs;
-	struct __prelim_ref *ref;
+	struct prelim_ref *ref;
+	struct rb_node *node;
 	struct extent_inode_elem *eie = NULL;
-	struct ref_root *ref_tree = NULL;
+	/* total of both direct AND indirect refs! */
 	u64 total_refs = 0;
-
-	INIT_LIST_HEAD(&prefs);
-	INIT_LIST_HEAD(&prefs_delayed);
+	struct preftrees preftrees = {
+		.direct = PREFTREE_INIT,
+		.indirect = PREFTREE_INIT,
+		.indirect_missing_keys = PREFTREE_INIT
+	};
 
 	key.objectid = bytenr;
 	key.offset = (u64)-1;
@@ -1257,18 +1158,6 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
 again:
 	head = NULL;
 
-	if (check_shared) {
-		if (!ref_tree) {
-			ref_tree = ref_root_alloc();
-			if (!ref_tree) {
-				ret = -ENOMEM;
-				goto out;
-			}
-		} else {
-			ref_root_fini(ref_tree);
-		}
-	}
-
 	ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 0);
 	if (ret < 0)
 		goto out;
@@ -1304,45 +1193,14 @@ again:
 				goto again;
 			}
 			spin_unlock(&delayed_refs->lock);
-			ret = __add_delayed_refs(head, time_seq,
-						 &prefs_delayed, &total_refs,
-						 inum);
+			ret = add_delayed_refs(fs_info, head, time_seq,
+					       &preftrees, &total_refs, sc);
 			mutex_unlock(&head->mutex);
 			if (ret)
 				goto out;
 		} else {
 			spin_unlock(&delayed_refs->lock);
 		}
-
-		if (check_shared && !list_empty(&prefs_delayed)) {
-			/*
-			 * Add all delay_ref to the ref_tree and check if there
-			 * are multiple ref items added.
-			 */
-			list_for_each_entry(ref, &prefs_delayed, list) {
-				if (ref->key_for_search.type) {
-					ret = ref_tree_add(ref_tree,
-						ref->root_id,
-						ref->key_for_search.objectid,
-						ref->key_for_search.offset,
-						0, ref->count);
-					if (ret)
-						goto out;
-				} else {
-					ret = ref_tree_add(ref_tree, 0, 0, 0,
-						     ref->parent, ref->count);
-					if (ret)
-						goto out;
-				}
-
-			}
-
-			if (ref_tree->unique_refs > 1) {
-				ret = BACKREF_FOUND_SHARED;
-				goto out;
-			}
-
-		}
 	}
 
 	if (path->slots[0]) {
@@ -1356,42 +1214,48 @@ again:
 		if (key.objectid == bytenr &&
 		    (key.type == BTRFS_EXTENT_ITEM_KEY ||
 		     key.type == BTRFS_METADATA_ITEM_KEY)) {
-			ret = __add_inline_refs(path, bytenr,
-						&info_level, &prefs,
-						ref_tree, &total_refs,
-						inum);
+			ret = add_inline_refs(fs_info, path, bytenr,
+					      &info_level, &preftrees,
+					      &total_refs, sc);
 			if (ret)
 				goto out;
-			ret = __add_keyed_refs(fs_info, path, bytenr,
-					       info_level, &prefs,
-					       ref_tree, inum);
+			ret = add_keyed_refs(fs_info, path, bytenr, info_level,
+					     &preftrees, sc);
 			if (ret)
 				goto out;
 		}
 	}
-	btrfs_release_path(path);
 
-	list_splice_init(&prefs_delayed, &prefs);
+	btrfs_release_path(path);
 
-	ret = __add_missing_keys(fs_info, &prefs);
+	ret = add_missing_keys(fs_info, &preftrees);
 	if (ret)
 		goto out;
 
-	__merge_refs(&prefs, MERGE_IDENTICAL_KEYS);
+	WARN_ON(!RB_EMPTY_ROOT(&preftrees.indirect_missing_keys.root));
 
-	ret = __resolve_indirect_refs(fs_info, path, time_seq, &prefs,
-				      extent_item_pos, total_refs,
-				      root_objectid);
+	ret = resolve_indirect_refs(fs_info, path, time_seq, &preftrees,
+				    extent_item_pos, total_refs, sc);
 	if (ret)
 		goto out;
 
-	__merge_refs(&prefs, MERGE_IDENTICAL_PARENTS);
+	WARN_ON(!RB_EMPTY_ROOT(&preftrees.indirect.root));
 
-	while (!list_empty(&prefs)) {
-		ref = list_first_entry(&prefs, struct __prelim_ref, list);
+	/*
+	 * This walks the tree of merged and resolved refs. Tree blocks are
+	 * read in as needed. Unique entries are added to the ulist, and
+	 * the list of found roots is updated.
+	 *
+	 * We release the entire tree in one go before returning.
+	 */
+	node = rb_first(&preftrees.direct.root);
+	while (node) {
+		ref = rb_entry(node, struct prelim_ref, rbnode);
+		node = rb_next(&ref->rbnode);
 		WARN_ON(ref->count < 0);
 		if (roots && ref->count && ref->root_id && ref->parent == 0) {
-			if (root_objectid && ref->root_id != root_objectid) {
+			if (sc && sc->root_objectid &&
+			    ref->root_id != sc->root_objectid) {
 				ret = BACKREF_FOUND_SHARED;
 				goto out;
 			}
@@ -1442,24 +1306,16 @@ again:
 			}
 			eie = NULL;
 		}
-		list_del(&ref->list);
-		kmem_cache_free(btrfs_prelim_ref_cache, ref);
+		cond_resched();
 	}
 
 out:
 	btrfs_free_path(path);
-	ref_root_free(ref_tree);
-	while (!list_empty(&prefs)) {
-		ref = list_first_entry(&prefs, struct __prelim_ref, list);
-		list_del(&ref->list);
-		kmem_cache_free(btrfs_prelim_ref_cache, ref);
-	}
-	while (!list_empty(&prefs_delayed)) {
-		ref = list_first_entry(&prefs_delayed, struct __prelim_ref,
-				       list);
-		list_del(&ref->list);
-		kmem_cache_free(btrfs_prelim_ref_cache, ref);
-	}
+
+	prelim_release(&preftrees.direct);
+	prelim_release(&preftrees.indirect);
+	prelim_release(&preftrees.indirect_missing_keys);
+
 	if (ret < 0)
 		free_inode_elem_list(eie);
 	return ret;
@@ -1475,7 +1331,7 @@ static void free_leaf_list(struct ulist *blocks)
 	while ((node = ulist_next(blocks, &uiter))) {
 		if (!node->aux)
 			continue;
-		eie = (struct extent_inode_elem *)(uintptr_t)node->aux;
+		eie = unode_aux_to_inode_list(node);
 		free_inode_elem_list(eie);
 		node->aux = 0;
 	}
@@ -1503,7 +1359,7 @@ static int btrfs_find_all_leafs(struct btrfs_trans_handle *trans,
 		return -ENOMEM;
 
 	ret = find_parent_nodes(trans, fs_info, bytenr, time_seq,
-				*leafs, NULL, extent_item_pos, 0, 0, 0);
+				*leafs, NULL, extent_item_pos, NULL);
 	if (ret < 0 && ret != -ENOENT) {
 		free_leaf_list(*leafs);
 		return ret;
@@ -1525,9 +1381,9 @@ static int btrfs_find_all_leafs(struct btrfs_trans_handle *trans,
  *
  * returns 0 on success, < 0 on error.
  */
-static int __btrfs_find_all_roots(struct btrfs_trans_handle *trans,
-				  struct btrfs_fs_info *fs_info, u64 bytenr,
-				  u64 time_seq, struct ulist **roots)
+static int btrfs_find_all_roots_safe(struct btrfs_trans_handle *trans,
+				     struct btrfs_fs_info *fs_info, u64 bytenr,
+				     u64 time_seq, struct ulist **roots)
 {
 	struct ulist *tmp;
 	struct ulist_node *node = NULL;
@@ -1546,7 +1402,7 @@ static int __btrfs_find_all_roots(struct btrfs_trans_handle *trans,
 	ULIST_ITER_INIT(&uiter);
 	while (1) {
 		ret = find_parent_nodes(trans, fs_info, bytenr, time_seq,
-					tmp, *roots, NULL, 0, 0, 0);
+					tmp, *roots, NULL, NULL);
 		if (ret < 0 && ret != -ENOENT) {
 			ulist_free(tmp);
 			ulist_free(*roots);
@@ -1571,7 +1427,8 @@ int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
 
 	if (!trans)
 		down_read(&fs_info->commit_root_sem);
-	ret = __btrfs_find_all_roots(trans, fs_info, bytenr, time_seq, roots);
+	ret = btrfs_find_all_roots_safe(trans, fs_info, bytenr,
+					time_seq, roots);
 	if (!trans)
 		up_read(&fs_info->commit_root_sem);
 	return ret;
@@ -1580,26 +1437,32 @@ int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
 /**
  * btrfs_check_shared - tell us whether an extent is shared
  *
- * @trans: optional trans handle
- *
  * btrfs_check_shared uses the backref walking code but will short
  * circuit as soon as it finds a root or inode that doesn't match the
  * one passed in. This provides a significant performance benefit for
  * callers (such as fiemap) which want to know whether the extent is
  * shared but do not need a ref count.
  *
+ * This attempts to allocate a transaction in order to account for
+ * delayed refs, but continues on even when the alloc fails.
+ *
  * Return: 0 if extent is not shared, 1 if it is shared, < 0 on error.
  */
-int btrfs_check_shared(struct btrfs_trans_handle *trans,
-		       struct btrfs_fs_info *fs_info, u64 root_objectid,
-		       u64 inum, u64 bytenr)
+int btrfs_check_shared(struct btrfs_root *root, u64 inum, u64 bytenr)
 {
+	struct btrfs_fs_info *fs_info = root->fs_info;
+	struct btrfs_trans_handle *trans;
 	struct ulist *tmp = NULL;
 	struct ulist *roots = NULL;
 	struct ulist_iterator uiter;
 	struct ulist_node *node;
 	struct seq_list elem = SEQ_LIST_INIT(elem);
 	int ret = 0;
+	struct share_check shared = {
+		.root_objectid = root->objectid,
+		.inum = inum,
+		.share_count = 0,
+	};
 
 	tmp = ulist_alloc(GFP_NOFS);
 	roots = ulist_alloc(GFP_NOFS);
@@ -1609,14 +1472,18 @@ int btrfs_check_shared(struct btrfs_trans_handle *trans,
 		return -ENOMEM;
 	}
 
-	if (trans)
-		btrfs_get_tree_mod_seq(fs_info, &elem);
-	else
+	trans = btrfs_join_transaction(root);
+	if (IS_ERR(trans)) {
+		trans = NULL;
 		down_read(&fs_info->commit_root_sem);
+	} else {
+		btrfs_get_tree_mod_seq(fs_info, &elem);
+	}
+
 	ULIST_ITER_INIT(&uiter);
 	while (1) {
 		ret = find_parent_nodes(trans, fs_info, bytenr, elem.seq, tmp,
-					roots, NULL, root_objectid, inum, 1);
+					roots, NULL, &shared);
 		if (ret == BACKREF_FOUND_SHARED) {
 			/* this is the only condition under which we return 1 */
 			ret = 1;
@@ -1631,10 +1498,13 @@ int btrfs_check_shared(struct btrfs_trans_handle *trans,
 		bytenr = node->val;
 		cond_resched();
 	}
-	if (trans)
+
+	if (trans) {
 		btrfs_put_tree_mod_seq(fs_info, &elem);
-	else
+		btrfs_end_transaction(trans);
+	} else {
 		up_read(&fs_info->commit_root_sem);
+	}
 	ulist_free(tmp);
 	ulist_free(roots);
 	return ret;
@@ -1649,7 +1519,7 @@ int btrfs_find_one_extref(struct btrfs_root *root, u64 inode_objectid,
 	struct btrfs_key key;
 	struct btrfs_key found_key;
 	struct btrfs_inode_extref *extref;
-	struct extent_buffer *leaf;
+	const struct extent_buffer *leaf;
 	unsigned long ptr;
 
 	key.objectid = inode_objectid;
@@ -1806,7 +1676,7 @@ int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical,
 	u64 flags;
 	u64 size = 0;
 	u32 item_size;
-	struct extent_buffer *eb;
+	const struct extent_buffer *eb;
 	struct btrfs_extent_item *ei;
 	struct btrfs_key key;
 
@@ -1870,15 +1740,17 @@ int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical,
  * helper function to iterate extent inline refs. ptr must point to a 0 value
  * for the first call and may be modified. it is used to track state.
  * if more refs exist, 0 is returned and the next call to
- * __get_extent_inline_ref must pass the modified ptr parameter to get the
+ * get_extent_inline_ref must pass the modified ptr parameter to get the
  * next ref. after the last ref was processed, 1 is returned.
  * returns <0 on error
  */
-static int __get_extent_inline_ref(unsigned long *ptr, struct extent_buffer *eb,
-				   struct btrfs_key *key,
-				   struct btrfs_extent_item *ei, u32 item_size,
-				   struct btrfs_extent_inline_ref **out_eiref,
-				   int *out_type)
+static int get_extent_inline_ref(unsigned long *ptr,
+				 const struct extent_buffer *eb,
+				 const struct btrfs_key *key,
+				 const struct btrfs_extent_item *ei,
+				 u32 item_size,
+				 struct btrfs_extent_inline_ref **out_eiref,
+				 int *out_type)
 {
 	unsigned long end;
 	u64 flags;
@@ -1908,7 +1780,10 @@ static int __get_extent_inline_ref(unsigned long *ptr, struct extent_buffer *eb,
 
 	end = (unsigned long)ei + item_size;
 	*out_eiref = (struct btrfs_extent_inline_ref *)(*ptr);
-	*out_type = btrfs_extent_inline_ref_type(eb, *out_eiref);
+	*out_type = btrfs_get_extent_inline_ref_type(eb, *out_eiref,
+						     BTRFS_REF_TYPE_ANY);
+	if (*out_type == BTRFS_REF_TYPE_INVALID)
+		return -EINVAL;
 
 	*ptr += btrfs_extent_inline_ref_size(*out_type);
 	WARN_ON(*ptr > end);
@@ -1921,7 +1796,7 @@ static int __get_extent_inline_ref(unsigned long *ptr, struct extent_buffer *eb,
 /*
  * reads the tree block backref for an extent. tree level and root are returned
  * through out_level and out_root. ptr must point to a 0 value for the first
- * call and may be modified (see __get_extent_inline_ref comment).
+ * call and may be modified (see get_extent_inline_ref comment).
  * returns 0 if data was provided, 1 if there was no more data to provide or
  * <0 on error.
  */
@@ -1937,7 +1812,7 @@ int tree_backref_for_extent(unsigned long *ptr, struct extent_buffer *eb,
 		return 1;
 
 	while (1) {
-		ret = __get_extent_inline_ref(ptr, eb, key, ei, item_size,
+		ret = get_extent_inline_ref(ptr, eb, key, ei, item_size,
 					      &eiref, &type);
 		if (ret < 0)
 			return ret;
@@ -2034,8 +1909,8 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
 
 	ULIST_ITER_INIT(&ref_uiter);
 	while (!ret && (ref_node = ulist_next(refs, &ref_uiter))) {
-		ret = __btrfs_find_all_roots(trans, fs_info, ref_node->val,
-					     tree_mod_seq_elem.seq, &roots);
+		ret = btrfs_find_all_roots_safe(trans, fs_info, ref_node->val,
+						tree_mod_seq_elem.seq, &roots);
 		if (ret)
 			break;
 		ULIST_ITER_INIT(&root_uiter);
diff --git a/fs/btrfs/backref.h b/fs/btrfs/backref.h
index 9c41fbac3009..e410335841aa 100644
--- a/fs/btrfs/backref.h
+++ b/fs/btrfs/backref.h
@@ -68,10 +68,20 @@ int btrfs_find_one_extref(struct btrfs_root *root, u64 inode_objectid,
 			  u64 start_off, struct btrfs_path *path,
 			  struct btrfs_inode_extref **ret_extref,
 			  u64 *found_off);
-int btrfs_check_shared(struct btrfs_trans_handle *trans,
-		       struct btrfs_fs_info *fs_info, u64 root_objectid,
-		       u64 inum, u64 bytenr);
+int btrfs_check_shared(struct btrfs_root *root, u64 inum, u64 bytenr);
 
 int __init btrfs_prelim_ref_init(void);
 void btrfs_prelim_ref_exit(void);
+
+struct prelim_ref {
+	struct rb_node rbnode;
+	u64 root_id;
+	struct btrfs_key key_for_search;
+	int level;
+	int count;
+	struct extent_inode_elem *inode_list;
+	u64 parent;
+	u64 wanted_disk_byte;
+};
+
 #endif
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index d87ac27a5f2b..eccadb5f62a5 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -179,9 +179,14 @@ struct btrfs_inode {
 	unsigned reserved_extents;
 
 	/*
-	 * always compress this one file
+	 * Cached values of inode properties
 	 */
-	unsigned force_compress;
+	unsigned prop_compress;		/* per-file compression algorithm */
+	/*
+	 * Force compression on the file using the defrag ioctl, could be
+	 * different from prop_compress and takes precedence if set
+	 */
+	unsigned defrag_compress;
 
 	struct btrfs_delayed_node *delayed_node;
 
@@ -207,7 +212,7 @@ struct btrfs_inode {
 
 extern unsigned char btrfs_filetype_table[];
 
-static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
+static inline struct btrfs_inode *BTRFS_I(const struct inode *inode)
 {
 	return container_of(inode, struct btrfs_inode, vfs_inode);
 }
@@ -231,7 +236,7 @@ static inline void btrfs_insert_inode_hash(struct inode *inode)
 	__insert_inode_hash(inode, h);
 }
 
-static inline u64 btrfs_ino(struct btrfs_inode *inode)
+static inline u64 btrfs_ino(const struct btrfs_inode *inode)
 {
 	u64 ino = inode->location.objectid;
 
diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
index fb07e3c22b9a..7d5a9b51f0d7 100644
--- a/fs/btrfs/check-integrity.c
+++ b/fs/btrfs/check-integrity.c
@@ -791,12 +791,12 @@ static int btrfsic_process_superblock_dev_mirror(
 	dev_bytenr = btrfs_sb_offset(superblock_mirror_num);
 	if (dev_bytenr + BTRFS_SUPER_INFO_SIZE > device->commit_total_bytes)
 		return -1;
-	bh = __bread(superblock_bdev, dev_bytenr / 4096,
+	bh = __bread(superblock_bdev, dev_bytenr / BTRFS_BDEV_BLOCKSIZE,
 		     BTRFS_SUPER_INFO_SIZE);
 	if (NULL == bh)
 		return -1;
 	super_tmp = (struct btrfs_super_block *)
-	    (bh->b_data + (dev_bytenr & 4095));
+	    (bh->b_data + (dev_bytenr & (BTRFS_BDEV_BLOCKSIZE - 1)));
 
 	if (btrfs_super_bytenr(super_tmp) != dev_bytenr ||
 	    btrfs_super_magic(super_tmp) != BTRFS_MAGIC ||
@@ -1728,7 +1728,7 @@ static int btrfsic_test_for_metadata(struct btrfsic_state *state,
 	num_pages = state->metablock_size >> PAGE_SHIFT;
 	h = (struct btrfs_header *)datav[0];
 
-	if (memcmp(h->fsid, fs_info->fsid, BTRFS_UUID_SIZE))
+	if (memcmp(h->fsid, fs_info->fsid, BTRFS_FSID_SIZE))
 		return 1;
 
 	for (i = 0; i < num_pages; i++) {
@@ -2753,7 +2753,7 @@ int btrfsic_submit_bh(int op, int op_flags, struct buffer_head *bh)
 	    (op == REQ_OP_WRITE) && bh->b_size > 0) {
 		u64 dev_bytenr;
 
-		dev_bytenr = 4096 * bh->b_blocknr;
+		dev_bytenr = BTRFS_BDEV_BLOCKSIZE * bh->b_blocknr;
 		if (dev_state->state->print_mask &
 		    BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH)
 			pr_info("submit_bh(op=0x%x,0x%x, blocknr=%llu (bytenr %llu), size=%zu, data=%p, bdev=%p)\n",
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index d2ef9ac2a630..883ecc58fd0d 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -825,7 +825,7 @@ static void free_workspace(int type, struct list_head *workspace)
 	int *free_ws			= &btrfs_comp_ws[idx].free_ws;
 
 	spin_lock(ws_lock);
-	if (*free_ws < num_online_cpus()) {
+	if (*free_ws <= num_online_cpus()) {
 		list_add(workspace, idle_ws);
 		(*free_ws)++;
 		spin_unlock(ws_lock);
@@ -1047,3 +1047,36 @@ int btrfs_decompress_buf2page(const char *buf, unsigned long buf_start,
 
 	return 1;
 }
+
+/*
+ * Compression heuristic.
+ *
+ * For now is's a naive and optimistic 'return true', we'll extend the logic to
+ * quickly (compared to direct compression) detect data characteristics
+ * (compressible/uncompressible) to avoid wasting CPU time on uncompressible
+ * data.
+ *
+ * The following types of analysis can be performed:
+ * - detect mostly zero data
+ * - detect data with low "byte set" size (text, etc)
+ * - detect data with low/high "core byte" set
+ *
+ * Return non-zero if the compression should be done, 0 otherwise.
+ */
+int btrfs_compress_heuristic(struct inode *inode, u64 start, u64 end)
+{
+	u64 index = start >> PAGE_SHIFT;
+	u64 end_index = end >> PAGE_SHIFT;
+	struct page *page;
+	int ret = 1;
+
+	while (index <= end_index) {
+		page = find_get_page(inode->i_mapping, index);
+		kmap(page);
+		kunmap(page);
+		put_page(page);
+		index++;
+	}
+
+	return ret;
+}
diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
index 87f6d3332163..3b1b0ac15fdc 100644
--- a/fs/btrfs/compression.h
+++ b/fs/btrfs/compression.h
@@ -100,7 +100,6 @@ enum btrfs_compression_type {
 	BTRFS_COMPRESS_ZLIB  = 1,
 	BTRFS_COMPRESS_LZO   = 2,
 	BTRFS_COMPRESS_TYPES = 2,
-	BTRFS_COMPRESS_LAST  = 3,
 };
 
 struct btrfs_compress_op {
@@ -129,4 +128,6 @@ struct btrfs_compress_op {
 extern const struct btrfs_compress_op btrfs_zlib_compress;
 extern const struct btrfs_compress_op btrfs_lzo_compress;
 
+int btrfs_compress_heuristic(struct inode *inode, u64 start, u64 end);
+
 #endif
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 3f4daa9d6e2c..6d49db7d86be 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -4650,7 +4650,7 @@ void btrfs_truncate_item(struct btrfs_fs_info *fs_info,
 	btrfs_mark_buffer_dirty(leaf);
 
 	if (btrfs_leaf_free_space(fs_info, leaf) < 0) {
-		btrfs_print_leaf(fs_info, leaf);
+		btrfs_print_leaf(leaf);
 		BUG();
 	}
 }
@@ -4679,7 +4679,7 @@ void btrfs_extend_item(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
 	data_end = leaf_data_end(fs_info, leaf);
 
 	if (btrfs_leaf_free_space(fs_info, leaf) < data_size) {
-		btrfs_print_leaf(fs_info, leaf);
+		btrfs_print_leaf(leaf);
 		BUG();
 	}
 	slot = path->slots[0];
@@ -4687,7 +4687,7 @@ void btrfs_extend_item(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
 
 	BUG_ON(slot < 0);
 	if (slot >= nritems) {
-		btrfs_print_leaf(fs_info, leaf);
+		btrfs_print_leaf(leaf);
 		btrfs_crit(fs_info, "slot %d too large, nritems %d",
 			   slot, nritems);
 		BUG_ON(1);
@@ -4718,7 +4718,7 @@ void btrfs_extend_item(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
 	btrfs_mark_buffer_dirty(leaf);
 
 	if (btrfs_leaf_free_space(fs_info, leaf) < 0) {
-		btrfs_print_leaf(fs_info, leaf);
+		btrfs_print_leaf(leaf);
 		BUG();
 	}
 }
@@ -4757,7 +4757,7 @@ void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
 	data_end = leaf_data_end(fs_info, leaf);
 
 	if (btrfs_leaf_free_space(fs_info, leaf) < total_size) {
-		btrfs_print_leaf(fs_info, leaf);
+		btrfs_print_leaf(leaf);
 		btrfs_crit(fs_info, "not enough freespace need %u have %d",
 			   total_size, btrfs_leaf_free_space(fs_info, leaf));
 		BUG();
@@ -4767,7 +4767,7 @@ void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
 		unsigned int old_data = btrfs_item_end_nr(leaf, slot);
 
 		if (old_data < data_end) {
-			btrfs_print_leaf(fs_info, leaf);
+			btrfs_print_leaf(leaf);
 			btrfs_crit(fs_info, "slot %d old_data %d data_end %d",
 				   slot, old_data, data_end);
 			BUG_ON(1);
@@ -4811,7 +4811,7 @@ void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
 	btrfs_mark_buffer_dirty(leaf);
 
 	if (btrfs_leaf_free_space(fs_info, leaf) < 0) {
-		btrfs_print_leaf(fs_info, leaf);
+		btrfs_print_leaf(leaf);
 		BUG();
 	}
 }
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 3f3eb7b17cac..2add002662f4 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -470,8 +470,8 @@ struct btrfs_block_rsv {
 
 /*
  * free clusters are used to claim free space in relatively large chunks,
- * allowing us to do less seeky writes.  They are used for all metadata
- * allocations and data allocations in ssd mode.
+ * allowing us to do less seeky writes. They are used for all metadata
+ * allocations. In ssd_spread mode they are also used for data allocations.
  */
 struct btrfs_free_cluster {
 	spinlock_t lock;
@@ -558,7 +558,6 @@ struct btrfs_block_group_cache {
 	u64 bytes_super;
 	u64 flags;
 	u64 cache_generation;
-	u32 sectorsize;
 
 	/*
 	 * If the free space extent count exceeds this number, convert the block
@@ -968,7 +967,7 @@ struct btrfs_fs_info {
 
 	struct reloc_control *reloc_ctl;
 
-	/* data_alloc_cluster is only used in ssd mode */
+	/* data_alloc_cluster is only used in ssd_spread mode */
 	struct btrfs_free_cluster data_alloc_cluster;
 
 	/* all metadata allocations go through this cluster */
@@ -1072,8 +1071,6 @@ struct btrfs_fs_info {
 	/* next backup root to be overwritten */
 	int backup_root_index;
 
-	int num_tolerated_disk_barrier_failures;
-
 	/* device replace state */
 	struct btrfs_dev_replace dev_replace;
 
@@ -1261,12 +1258,17 @@ struct btrfs_root {
 	 */
 	int send_in_progress;
 	struct btrfs_subvolume_writers *subv_writers;
-	atomic_t will_be_snapshoted;
+	atomic_t will_be_snapshotted;
 
 	/* For qgroup metadata space reserve */
 	atomic64_t qgroup_meta_rsv;
 };
 
+struct btrfs_file_private {
+	struct btrfs_trans_handle *trans;
+	void *filldir_buf;
+};
+
 static inline u32 btrfs_inode_sectorsize(const struct inode *inode)
 {
 	return btrfs_sb(inode->i_sb)->sectorsize;
@@ -1435,7 +1437,7 @@ do {                                                                   \
 #define BTRFS_INODE_ROOT_ITEM_INIT	(1 << 31)
 
 struct btrfs_map_token {
-	struct extent_buffer *eb;
+	const struct extent_buffer *eb;
 	char *kaddr;
 	unsigned long offset;
 };
@@ -1469,18 +1471,19 @@ static inline void btrfs_init_map_token (struct btrfs_map_token *token)
 			   sizeof(((type *)0)->member)))
 
 #define DECLARE_BTRFS_SETGET_BITS(bits)					\
-u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr,	\
-			       unsigned long off,			\
-                              struct btrfs_map_token *token);		\
-void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr,	\
+u##bits btrfs_get_token_##bits(const struct extent_buffer *eb,		\
+			       const void *ptr, unsigned long off,	\
+			       struct btrfs_map_token *token);		\
+void btrfs_set_token_##bits(struct extent_buffer *eb, const void *ptr,	\
 			    unsigned long off, u##bits val,		\
 			    struct btrfs_map_token *token);		\
-static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \
+static inline u##bits btrfs_get_##bits(const struct extent_buffer *eb,	\
+				       const void *ptr,			\
 				       unsigned long off)		\
 {									\
 	return btrfs_get_token_##bits(eb, ptr, off, NULL);		\
 }									\
-static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
+static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,\
 				    unsigned long off, u##bits val)	\
 {									\
        btrfs_set_token_##bits(eb, ptr, off, val, NULL);			\
@@ -1492,7 +1495,8 @@ DECLARE_BTRFS_SETGET_BITS(32)
 DECLARE_BTRFS_SETGET_BITS(64)
 
 #define BTRFS_SETGET_FUNCS(name, type, member, bits)			\
-static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s)	\
+static inline u##bits btrfs_##name(const struct extent_buffer *eb,	\
+				   const type *s)			\
 {									\
 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
 	return btrfs_get_##bits(eb, s, offsetof(type, member));		\
@@ -1503,7 +1507,8 @@ static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,	\
 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
 	btrfs_set_##bits(eb, s, offsetof(type, member), val);		\
 }									\
-static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \
+static inline u##bits btrfs_token_##name(const struct extent_buffer *eb,\
+					 const type *s,			\
 					 struct btrfs_map_token *token)	\
 {									\
 	BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);	\
@@ -1518,9 +1523,9 @@ static inline void btrfs_set_token_##name(struct extent_buffer *eb,	\
 }
 
 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)		\
-static inline u##bits btrfs_##name(struct extent_buffer *eb)		\
+static inline u##bits btrfs_##name(const struct extent_buffer *eb)	\
 {									\
-	type *p = page_address(eb->pages[0]);				\
+	const type *p = page_address(eb->pages[0]);			\
 	u##bits res = le##bits##_to_cpu(p->member);			\
 	return res;							\
 }									\
@@ -1532,7 +1537,7 @@ static inline void btrfs_set_##name(struct extent_buffer *eb,		\
 }
 
 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)		\
-static inline u##bits btrfs_##name(type *s)				\
+static inline u##bits btrfs_##name(const type *s)			\
 {									\
 	return le##bits##_to_cpu(s->member);				\
 }									\
@@ -1799,7 +1804,6 @@ static inline u32 btrfs_extent_inline_ref_size(int type)
 	if (type == BTRFS_EXTENT_DATA_REF_KEY)
 		return sizeof(struct btrfs_extent_data_ref) +
 		       offsetof(struct btrfs_extent_inline_ref, offset);
-	BUG();
 	return 0;
 }
 
@@ -1857,7 +1861,7 @@ static inline unsigned long btrfs_node_key_ptr_offset(int nr)
 		sizeof(struct btrfs_key_ptr) * nr;
 }
 
-void btrfs_node_key(struct extent_buffer *eb,
+void btrfs_node_key(const struct extent_buffer *eb,
 		    struct btrfs_disk_key *disk_key, int nr);
 
 static inline void btrfs_set_node_key(struct extent_buffer *eb,
@@ -1886,28 +1890,28 @@ static inline struct btrfs_item *btrfs_item_nr(int nr)
 	return (struct btrfs_item *)btrfs_item_nr_offset(nr);
 }
 
-static inline u32 btrfs_item_end(struct extent_buffer *eb,
+static inline u32 btrfs_item_end(const struct extent_buffer *eb,
 				 struct btrfs_item *item)
 {
 	return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
 }
 
-static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
+static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr)
 {
 	return btrfs_item_end(eb, btrfs_item_nr(nr));
 }
 
-static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
+static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
 {
 	return btrfs_item_offset(eb, btrfs_item_nr(nr));
 }
 
-static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
+static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr)
 {
 	return btrfs_item_size(eb, btrfs_item_nr(nr));
 }
 
-static inline void btrfs_item_key(struct extent_buffer *eb,
+static inline void btrfs_item_key(const struct extent_buffer *eb,
 			   struct btrfs_disk_key *disk_key, int nr)
 {
 	struct btrfs_item *item = btrfs_item_nr(nr);
@@ -1943,8 +1947,8 @@ BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
 			 transid, 64);
 
-static inline void btrfs_dir_item_key(struct extent_buffer *eb,
-				      struct btrfs_dir_item *item,
+static inline void btrfs_dir_item_key(const struct extent_buffer *eb,
+				      const struct btrfs_dir_item *item,
 				      struct btrfs_disk_key *key)
 {
 	read_eb_member(eb, item, struct btrfs_dir_item, location, key);
@@ -1952,7 +1956,7 @@ static inline void btrfs_dir_item_key(struct extent_buffer *eb,
 
 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
 					  struct btrfs_dir_item *item,
-					  struct btrfs_disk_key *key)
+					  const struct btrfs_disk_key *key)
 {
 	write_eb_member(eb, item, struct btrfs_dir_item, location, key);
 }
@@ -1964,8 +1968,8 @@ BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
 		   generation, 64);
 
-static inline void btrfs_free_space_key(struct extent_buffer *eb,
-					struct btrfs_free_space_header *h,
+static inline void btrfs_free_space_key(const struct extent_buffer *eb,
+					const struct btrfs_free_space_header *h,
 					struct btrfs_disk_key *key)
 {
 	read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
@@ -1973,7 +1977,7 @@ static inline void btrfs_free_space_key(struct extent_buffer *eb,
 
 static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
 					    struct btrfs_free_space_header *h,
-					    struct btrfs_disk_key *key)
+					    const struct btrfs_disk_key *key)
 {
 	write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
 }
@@ -2000,25 +2004,25 @@ static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
 	disk->objectid = cpu_to_le64(cpu->objectid);
 }
 
-static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
-				  struct btrfs_key *key, int nr)
+static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb,
+					 struct btrfs_key *key, int nr)
 {
 	struct btrfs_disk_key disk_key;
 	btrfs_node_key(eb, &disk_key, nr);
 	btrfs_disk_key_to_cpu(key, &disk_key);
 }
 
-static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
-				  struct btrfs_key *key, int nr)
+static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb,
+					 struct btrfs_key *key, int nr)
 {
 	struct btrfs_disk_key disk_key;
 	btrfs_item_key(eb, &disk_key, nr);
 	btrfs_disk_key_to_cpu(key, &disk_key);
 }
 
-static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
-				      struct btrfs_dir_item *item,
-				      struct btrfs_key *key)
+static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb,
+					     const struct btrfs_dir_item *item,
+					     struct btrfs_key *key)
 {
 	struct btrfs_disk_key disk_key;
 	btrfs_dir_item_key(eb, item, &disk_key);
@@ -2050,7 +2054,7 @@ BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
 			 nritems, 32);
 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
 
-static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
+static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag)
 {
 	return (btrfs_header_flags(eb) & flag) == flag;
 }
@@ -2069,7 +2073,7 @@ static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
 	return (flags & flag) == flag;
 }
 
-static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
+static inline int btrfs_header_backref_rev(const struct extent_buffer *eb)
 {
 	u64 flags = btrfs_header_flags(eb);
 	return flags >> BTRFS_BACKREF_REV_SHIFT;
@@ -2089,12 +2093,12 @@ static inline unsigned long btrfs_header_fsid(void)
 	return offsetof(struct btrfs_header, fsid);
 }
 
-static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
+static inline unsigned long btrfs_header_chunk_tree_uuid(const struct extent_buffer *eb)
 {
 	return offsetof(struct btrfs_header, chunk_tree_uuid);
 }
 
-static inline int btrfs_is_leaf(struct extent_buffer *eb)
+static inline int btrfs_is_leaf(const struct extent_buffer *eb)
 {
 	return btrfs_header_level(eb) == 0;
 }
@@ -2128,12 +2132,12 @@ BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
 			 rtransid, 64);
 
-static inline bool btrfs_root_readonly(struct btrfs_root *root)
+static inline bool btrfs_root_readonly(const struct btrfs_root *root)
 {
 	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
 }
 
-static inline bool btrfs_root_dead(struct btrfs_root *root)
+static inline bool btrfs_root_dead(const struct btrfs_root *root)
 {
 	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
 }
@@ -2190,51 +2194,51 @@ BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
 /* struct btrfs_balance_item */
 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
 
-static inline void btrfs_balance_data(struct extent_buffer *eb,
-				      struct btrfs_balance_item *bi,
+static inline void btrfs_balance_data(const struct extent_buffer *eb,
+				      const struct btrfs_balance_item *bi,
 				      struct btrfs_disk_balance_args *ba)
 {
 	read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
 }
 
 static inline void btrfs_set_balance_data(struct extent_buffer *eb,
-					  struct btrfs_balance_item *bi,
-					  struct btrfs_disk_balance_args *ba)
+				  struct btrfs_balance_item *bi,
+				  const struct btrfs_disk_balance_args *ba)
 {
 	write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
 }
 
-static inline void btrfs_balance_meta(struct extent_buffer *eb,
-				      struct btrfs_balance_item *bi,
+static inline void btrfs_balance_meta(const struct extent_buffer *eb,
+				      const struct btrfs_balance_item *bi,
 				      struct btrfs_disk_balance_args *ba)
 {
 	read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
 }
 
 static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
-					  struct btrfs_balance_item *bi,
-					  struct btrfs_disk_balance_args *ba)
+				  struct btrfs_balance_item *bi,
+				  const struct btrfs_disk_balance_args *ba)
 {
 	write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
 }
 
-static inline void btrfs_balance_sys(struct extent_buffer *eb,
-				     struct btrfs_balance_item *bi,
+static inline void btrfs_balance_sys(const struct extent_buffer *eb,
+				     const struct btrfs_balance_item *bi,
 				     struct btrfs_disk_balance_args *ba)
 {
 	read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
 }
 
 static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
-					 struct btrfs_balance_item *bi,
-					 struct btrfs_disk_balance_args *ba)
+				 struct btrfs_balance_item *bi,
+				 const struct btrfs_disk_balance_args *ba)
 {
 	write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
 }
 
 static inline void
 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
-			       struct btrfs_disk_balance_args *disk)
+			       const struct btrfs_disk_balance_args *disk)
 {
 	memset(cpu, 0, sizeof(*cpu));
 
@@ -2254,7 +2258,7 @@ btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
 
 static inline void
 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
-			       struct btrfs_balance_args *cpu)
+			       const struct btrfs_balance_args *cpu)
 {
 	memset(disk, 0, sizeof(*disk));
 
@@ -2322,7 +2326,7 @@ BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
 			 uuid_tree_generation, 64);
 
-static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
+static inline int btrfs_super_csum_size(const struct btrfs_super_block *s)
 {
 	u16 t = btrfs_super_csum_type(s);
 	/*
@@ -2337,8 +2341,8 @@ static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
  * this returns the address of the start of the last item,
  * which is the stop of the leaf data stack
  */
-static inline unsigned int leaf_data_end(struct btrfs_fs_info *fs_info,
-					 struct extent_buffer *leaf)
+static inline unsigned int leaf_data_end(const struct btrfs_fs_info *fs_info,
+					 const struct extent_buffer *leaf)
 {
 	u32 nr = btrfs_header_nritems(leaf);
 
@@ -2363,7 +2367,7 @@ BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
 			 struct btrfs_file_extent_item, compression, 8);
 
 static inline unsigned long
-btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
+btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e)
 {
 	return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
 }
@@ -2397,8 +2401,9 @@ BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
  * size of any extent headers.  If a file is compressed on disk, this is
  * the compressed size
  */
-static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
-						    struct btrfs_item *e)
+static inline u32 btrfs_file_extent_inline_item_len(
+						const struct extent_buffer *eb,
+						struct btrfs_item *e)
 {
 	return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
 }
@@ -2406,9 +2411,9 @@ static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
 /* this returns the number of file bytes represented by the inline item.
  * If an item is compressed, this is the uncompressed size
  */
-static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
-					       int slot,
-					       struct btrfs_file_extent_item *fi)
+static inline u32 btrfs_file_extent_inline_len(const struct extent_buffer *eb,
+					int slot,
+					const struct btrfs_file_extent_item *fi)
 {
 	struct btrfs_map_token token;
 
@@ -2430,8 +2435,8 @@ static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
 
 
 /* btrfs_dev_stats_item */
-static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb,
-					struct btrfs_dev_stats_item *ptr,
+static inline u64 btrfs_dev_stats_value(const struct extent_buffer *eb,
+					const struct btrfs_dev_stats_item *ptr,
 					int index)
 {
 	u64 val;
@@ -2561,6 +2566,17 @@ static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
 
 /* extent-tree.c */
 
+enum btrfs_inline_ref_type {
+	BTRFS_REF_TYPE_INVALID =	 0,
+	BTRFS_REF_TYPE_BLOCK =		 1,
+	BTRFS_REF_TYPE_DATA =		 2,
+	BTRFS_REF_TYPE_ANY =		 3,
+};
+
+int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
+				     struct btrfs_extent_inline_ref *iref,
+				     enum btrfs_inline_ref_type is_data);
+
 u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes);
 
 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_fs_info *fs_info,
@@ -2670,8 +2686,7 @@ int btrfs_read_block_groups(struct btrfs_fs_info *info);
 int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr);
 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
 			   struct btrfs_fs_info *fs_info, u64 bytes_used,
-			   u64 type, u64 chunk_objectid, u64 chunk_offset,
-			   u64 size);
+			   u64 type, u64 chunk_offset, u64 size);
 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
 				struct btrfs_fs_info *fs_info,
 				const u64 chunk_offset);
@@ -2772,8 +2787,8 @@ int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
 					 struct btrfs_fs_info *fs_info);
 int __get_raid_index(u64 flags);
-int btrfs_start_write_no_snapshoting(struct btrfs_root *root);
-void btrfs_end_write_no_snapshoting(struct btrfs_root *root);
+int btrfs_start_write_no_snapshotting(struct btrfs_root *root);
+void btrfs_end_write_no_snapshotting(struct btrfs_root *root);
 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
 void check_system_chunk(struct btrfs_trans_handle *trans,
 			struct btrfs_fs_info *fs_info, const u64 type);
@@ -2973,8 +2988,8 @@ int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
 		       struct btrfs_fs_info *fs_info,
 		       u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
 		       const char *name, int name_len);
-int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
-		   const struct btrfs_key *key);
+int btrfs_del_root(struct btrfs_trans_handle *trans,
+		   struct btrfs_fs_info *fs_info, const struct btrfs_key *key);
 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 		      const struct btrfs_key *key,
 		      struct btrfs_root_item *item);
@@ -3135,21 +3150,6 @@ noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
 			      u64 *orig_start, u64 *orig_block_len,
 			      u64 *ram_bytes);
 
-/* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
-#if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
-#define ClearPageChecked ClearPageFsMisc
-#define SetPageChecked SetPageFsMisc
-#define PageChecked PageFsMisc
-#endif
-
-/* This forces readahead on a given range of bytes in an inode */
-static inline void btrfs_force_ra(struct address_space *mapping,
-				  struct file_ra_state *ra, struct file *file,
-				  pgoff_t offset, unsigned long req_size)
-{
-	page_cache_sync_readahead(mapping, ra, file, offset, req_size);
-}
-
 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index);
 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
@@ -3229,7 +3229,6 @@ long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 int btrfs_ioctl_get_supported_features(void __user *arg);
 void btrfs_update_iflags(struct inode *inode);
-void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
 int btrfs_is_empty_uuid(u8 *uuid);
 int btrfs_defrag_file(struct inode *inode, struct file *file,
 		      struct btrfs_ioctl_defrag_range_args *range,
diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index 8ae409b5a61d..19e4ad2f3f2e 100644
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -1727,6 +1727,7 @@ int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
 
 		if (over)
 			return 1;
+		ctx->pos++;
 	}
 	return 0;
 }
diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index bee3edeea7a3..7a93a3e1a847 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -639,11 +639,39 @@ static void btrfs_dev_replace_update_device_in_mapping_tree(
 	write_unlock(&em_tree->lock);
 }
 
+/*
+ * Read progress of device replace status according to the state and last
+ * stored position. The value format is the same as for
+ * btrfs_dev_replace::progress_1000
+ */
+static u64 btrfs_dev_replace_progress(struct btrfs_fs_info *fs_info)
+{
+	struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
+	u64 ret = 0;
+
+	switch (dev_replace->replace_state) {
+	case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
+	case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
+		ret = 0;
+		break;
+	case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
+		ret = 1000;
+		break;
+	case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
+	case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
+		ret = div64_u64(dev_replace->cursor_left,
+				div_u64(btrfs_device_get_total_bytes(
+						dev_replace->srcdev), 1000));
+		break;
+	}
+
+	return ret;
+}
+
 void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
 			      struct btrfs_ioctl_dev_replace_args *args)
 {
 	struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
-	struct btrfs_device *srcdev;
 
 	btrfs_dev_replace_lock(dev_replace, 0);
 	/* even if !dev_replace_is_valid, the values are good enough for
@@ -656,21 +684,7 @@ void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
 		atomic64_read(&dev_replace->num_write_errors);
 	args->status.num_uncorrectable_read_errors =
 		atomic64_read(&dev_replace->num_uncorrectable_read_errors);
-	switch (dev_replace->replace_state) {
-	case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
-	case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
-		args->status.progress_1000 = 0;
-		break;
-	case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
-		args->status.progress_1000 = 1000;
-		break;
-	case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
-	case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
-		srcdev = dev_replace->srcdev;
-		args->status.progress_1000 = div64_u64(dev_replace->cursor_left,
-			div_u64(btrfs_device_get_total_bytes(srcdev), 1000));
-		break;
-	}
+	args->status.progress_1000 = btrfs_dev_replace_progress(fs_info);
 	btrfs_dev_replace_unlock(dev_replace, 0);
 }
 
@@ -795,25 +809,19 @@ static int btrfs_dev_replace_kthread(void *data)
 {
 	struct btrfs_fs_info *fs_info = data;
 	struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
-	struct btrfs_ioctl_dev_replace_args *status_args;
 	u64 progress;
 
-	status_args = kzalloc(sizeof(*status_args), GFP_KERNEL);
-	if (status_args) {
-		btrfs_dev_replace_status(fs_info, status_args);
-		progress = status_args->status.progress_1000;
-		kfree(status_args);
-		progress = div_u64(progress, 10);
-		btrfs_info_in_rcu(fs_info,
-			"continuing dev_replace from %s (devid %llu) to %s @%u%%",
-			dev_replace->srcdev->missing ? "<missing disk>" :
-			rcu_str_deref(dev_replace->srcdev->name),
-			dev_replace->srcdev->devid,
-			dev_replace->tgtdev ?
-			rcu_str_deref(dev_replace->tgtdev->name) :
-			"<missing target disk>",
-			(unsigned int)progress);
-	}
+	progress = btrfs_dev_replace_progress(fs_info);
+	progress = div_u64(progress, 10);
+	btrfs_info_in_rcu(fs_info,
+		"continuing dev_replace from %s (devid %llu) to %s @%u%%",
+		dev_replace->srcdev->missing ? "<missing disk>"
+			: rcu_str_deref(dev_replace->srcdev->name),
+		dev_replace->srcdev->devid,
+		dev_replace->tgtdev ? rcu_str_deref(dev_replace->tgtdev->name)
+			: "<missing target disk>",
+		(unsigned int)progress);
+
 	btrfs_dev_replace_continue_on_mount(fs_info);
 	clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
 
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 4f428a48d513..46329524dd5f 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -529,7 +529,7 @@ static int check_tree_block_fsid(struct btrfs_fs_info *fs_info,
 				 struct extent_buffer *eb)
 {
 	struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
-	u8 fsid[BTRFS_UUID_SIZE];
+	u8 fsid[BTRFS_FSID_SIZE];
 	int ret = 1;
 
 	read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
@@ -1343,7 +1343,7 @@ static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
 	atomic_set(&root->log_batch, 0);
 	atomic_set(&root->orphan_inodes, 0);
 	refcount_set(&root->refs, 1);
-	atomic_set(&root->will_be_snapshoted, 0);
+	atomic_set(&root->will_be_snapshotted, 0);
 	atomic64_set(&root->qgroup_meta_rsv, 0);
 	root->log_transid = 0;
 	root->log_transid_committed = -1;
@@ -2694,8 +2694,8 @@ int open_ctree(struct super_block *sb,
 	btrfs_init_balance(fs_info);
 	btrfs_init_async_reclaim_work(&fs_info->async_reclaim_work);
 
-	sb->s_blocksize = 4096;
-	sb->s_blocksize_bits = blksize_bits(4096);
+	sb->s_blocksize = BTRFS_BDEV_BLOCKSIZE;
+	sb->s_blocksize_bits = blksize_bits(BTRFS_BDEV_BLOCKSIZE);
 
 	btrfs_init_btree_inode(fs_info);
 
@@ -3035,15 +3035,10 @@ retry_root_backup:
 		btrfs_err(fs_info, "failed to read block groups: %d", ret);
 		goto fail_sysfs;
 	}
-	fs_info->num_tolerated_disk_barrier_failures =
-		btrfs_calc_num_tolerated_disk_barrier_failures(fs_info);
-	if (fs_info->fs_devices->missing_devices >
-	     fs_info->num_tolerated_disk_barrier_failures &&
-	    !(sb->s_flags & MS_RDONLY)) {
+
+	if (!(sb->s_flags & MS_RDONLY) && !btrfs_check_rw_degradable(fs_info)) {
 		btrfs_warn(fs_info,
-"missing devices (%llu) exceeds the limit (%d), writeable mount is not allowed",
-			fs_info->fs_devices->missing_devices,
-			fs_info->num_tolerated_disk_barrier_failures);
+		"writeable mount is not allowed due to too many missing devices");
 		goto fail_sysfs;
 	}
 
@@ -3058,11 +3053,9 @@ retry_root_backup:
 	if (IS_ERR(fs_info->transaction_kthread))
 		goto fail_cleaner;
 
-	if (!btrfs_test_opt(fs_info, SSD) &&
-	    !btrfs_test_opt(fs_info, NOSSD) &&
+	if (!btrfs_test_opt(fs_info, NOSSD) &&
 	    !fs_info->fs_devices->rotating) {
-		btrfs_info(fs_info, "detected SSD devices, enabling SSD mode");
-		btrfs_set_opt(fs_info->mount_opt, SSD);
+		btrfs_set_and_info(fs_info, SSD, "enabling ssd optimizations");
 	}
 
 	/*
@@ -3321,7 +3314,7 @@ int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
 	if (bytenr + BTRFS_SUPER_INFO_SIZE >= i_size_read(bdev->bd_inode))
 		return -EINVAL;
 
-	bh = __bread(bdev, bytenr / 4096, BTRFS_SUPER_INFO_SIZE);
+	bh = __bread(bdev, bytenr / BTRFS_BDEV_BLOCKSIZE, BTRFS_SUPER_INFO_SIZE);
 	/*
 	 * If we fail to read from the underlying devices, as of now
 	 * the best option we have is to mark it EIO.
@@ -3378,19 +3371,17 @@ struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
 }
 
 /*
- * this should be called twice, once with wait == 0 and
- * once with wait == 1.  When wait == 0 is done, all the buffer heads
- * we write are pinned.
+ * Write superblock @sb to the @device. Do not wait for completion, all the
+ * buffer heads we write are pinned.
  *
- * They are released when wait == 1 is done.
- * max_mirrors must be the same for both runs, and it indicates how
- * many supers on this one device should be written.
+ * Write @max_mirrors copies of the superblock, where 0 means default that fit
+ * the expected device size at commit time. Note that max_mirrors must be
+ * same for write and wait phases.
  *
- * max_mirrors == 0 means to write them all.
+ * Return number of errors when buffer head is not found or submission fails.
  */
 static int write_dev_supers(struct btrfs_device *device,
-			    struct btrfs_super_block *sb,
-			    int wait, int max_mirrors)
+			    struct btrfs_super_block *sb, int max_mirrors)
 {
 	struct buffer_head *bh;
 	int i;
@@ -3408,57 +3399,33 @@ static int write_dev_supers(struct btrfs_device *device,
 		    device->commit_total_bytes)
 			break;
 
-		if (wait) {
-			bh = __find_get_block(device->bdev, bytenr / 4096,
-					      BTRFS_SUPER_INFO_SIZE);
-			if (!bh) {
-				errors++;
-				continue;
-			}
-			wait_on_buffer(bh);
-			if (!buffer_uptodate(bh))
-				errors++;
+		btrfs_set_super_bytenr(sb, bytenr);
 
-			/* drop our reference */
-			brelse(bh);
+		crc = ~(u32)0;
+		crc = btrfs_csum_data((const char *)sb + BTRFS_CSUM_SIZE, crc,
+				      BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
+		btrfs_csum_final(crc, sb->csum);
 
-			/* drop the reference from the wait == 0 run */
-			brelse(bh);
+		/* One reference for us, and we leave it for the caller */
+		bh = __getblk(device->bdev, bytenr / BTRFS_BDEV_BLOCKSIZE,
+			      BTRFS_SUPER_INFO_SIZE);
+		if (!bh) {
+			btrfs_err(device->fs_info,
+			    "couldn't get super buffer head for bytenr %llu",
+			    bytenr);
+			errors++;
 			continue;
-		} else {
-			btrfs_set_super_bytenr(sb, bytenr);
-
-			crc = ~(u32)0;
-			crc = btrfs_csum_data((const char *)sb +
-					      BTRFS_CSUM_SIZE, crc,
-					      BTRFS_SUPER_INFO_SIZE -
-					      BTRFS_CSUM_SIZE);
-			btrfs_csum_final(crc, sb->csum);
-
-			/*
-			 * one reference for us, and we leave it for the
-			 * caller
-			 */
-			bh = __getblk(device->bdev, bytenr / 4096,
-				      BTRFS_SUPER_INFO_SIZE);
-			if (!bh) {
-				btrfs_err(device->fs_info,
-				    "couldn't get super buffer head for bytenr %llu",
-				    bytenr);
-				errors++;
-				continue;
-			}
+		}
 
-			memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
+		memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
 
-			/* one reference for submit_bh */
-			get_bh(bh);
+		/* one reference for submit_bh */
+		get_bh(bh);
 
-			set_buffer_uptodate(bh);
-			lock_buffer(bh);
-			bh->b_end_io = btrfs_end_buffer_write_sync;
-			bh->b_private = device;
-		}
+		set_buffer_uptodate(bh);
+		lock_buffer(bh);
+		bh->b_end_io = btrfs_end_buffer_write_sync;
+		bh->b_private = device;
 
 		/*
 		 * we fua the first super.  The others we allow
@@ -3466,9 +3433,10 @@ static int write_dev_supers(struct btrfs_device *device,
 		 */
 		if (i == 0) {
 			ret = btrfsic_submit_bh(REQ_OP_WRITE,
-						REQ_SYNC | REQ_FUA, bh);
+				REQ_SYNC | REQ_FUA | REQ_META | REQ_PRIO, bh);
 		} else {
-			ret = btrfsic_submit_bh(REQ_OP_WRITE, REQ_SYNC, bh);
+			ret = btrfsic_submit_bh(REQ_OP_WRITE,
+				REQ_SYNC | REQ_META | REQ_PRIO, bh);
 		}
 		if (ret)
 			errors++;
@@ -3477,6 +3445,50 @@ static int write_dev_supers(struct btrfs_device *device,
 }
 
 /*
+ * Wait for write completion of superblocks done by write_dev_supers,
+ * @max_mirrors same for write and wait phases.
+ *
+ * Return number of errors when buffer head is not found or not marked up to
+ * date.
+ */
+static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
+{
+	struct buffer_head *bh;
+	int i;
+	int errors = 0;
+	u64 bytenr;
+
+	if (max_mirrors == 0)
+		max_mirrors = BTRFS_SUPER_MIRROR_MAX;
+
+	for (i = 0; i < max_mirrors; i++) {
+		bytenr = btrfs_sb_offset(i);
+		if (bytenr + BTRFS_SUPER_INFO_SIZE >=
+		    device->commit_total_bytes)
+			break;
+
+		bh = __find_get_block(device->bdev,
+				      bytenr / BTRFS_BDEV_BLOCKSIZE,
+				      BTRFS_SUPER_INFO_SIZE);
+		if (!bh) {
+			errors++;
+			continue;
+		}
+		wait_on_buffer(bh);
+		if (!buffer_uptodate(bh))
+			errors++;
+
+		/* drop our reference */
+		brelse(bh);
+
+		/* drop the reference from the writing run */
+		brelse(bh);
+	}
+
+	return errors < i ? 0 : -1;
+}
+
+/*
  * endio for the write_dev_flush, this will wake anyone waiting
  * for the barrier when it is done
  */
@@ -3504,7 +3516,7 @@ static void write_dev_flush(struct btrfs_device *device)
 	init_completion(&device->flush_wait);
 	bio->bi_private = &device->flush_wait;
 
-	submit_bio(bio);
+	btrfsic_submit_bio(bio);
 	device->flush_bio_sent = 1;
 }
 
@@ -3524,20 +3536,10 @@ static blk_status_t wait_dev_flush(struct btrfs_device *device)
 	return bio->bi_status;
 }
 
-static int check_barrier_error(struct btrfs_fs_devices *fsdevs)
+static int check_barrier_error(struct btrfs_fs_info *fs_info)
 {
-	int dev_flush_error = 0;
-	struct btrfs_device *dev;
-
-	list_for_each_entry_rcu(dev, &fsdevs->devices, dev_list) {
-		if (!dev->bdev || dev->last_flush_error)
-			dev_flush_error++;
-	}
-
-	if (dev_flush_error >
-	    fsdevs->fs_info->num_tolerated_disk_barrier_failures)
+	if (!btrfs_check_rw_degradable(fs_info))
 		return -EIO;
-
 	return 0;
 }
 
@@ -3592,7 +3594,7 @@ static int barrier_all_devices(struct btrfs_fs_info *info)
 		 * to arrive at the volume status. So error checking
 		 * is being pushed to a separate loop.
 		 */
-		return check_barrier_error(info->fs_devices);
+		return check_barrier_error(info);
 	}
 	return 0;
 }
@@ -3626,60 +3628,6 @@ int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags)
 	return min_tolerated;
 }
 
-int btrfs_calc_num_tolerated_disk_barrier_failures(
-	struct btrfs_fs_info *fs_info)
-{
-	struct btrfs_ioctl_space_info space;
-	struct btrfs_space_info *sinfo;
-	u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
-		       BTRFS_BLOCK_GROUP_SYSTEM,
-		       BTRFS_BLOCK_GROUP_METADATA,
-		       BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
-	int i;
-	int c;
-	int num_tolerated_disk_barrier_failures =
-		(int)fs_info->fs_devices->num_devices;
-
-	for (i = 0; i < ARRAY_SIZE(types); i++) {
-		struct btrfs_space_info *tmp;
-
-		sinfo = NULL;
-		rcu_read_lock();
-		list_for_each_entry_rcu(tmp, &fs_info->space_info, list) {
-			if (tmp->flags == types[i]) {
-				sinfo = tmp;
-				break;
-			}
-		}
-		rcu_read_unlock();
-
-		if (!sinfo)
-			continue;
-
-		down_read(&sinfo->groups_sem);
-		for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
-			u64 flags;
-
-			if (list_empty(&sinfo->block_groups[c]))
-				continue;
-
-			btrfs_get_block_group_info(&sinfo->block_groups[c],
-						   &space);
-			if (space.total_bytes == 0 || space.used_bytes == 0)
-				continue;
-			flags = space.flags;
-
-			num_tolerated_disk_barrier_failures = min(
-				num_tolerated_disk_barrier_failures,
-				btrfs_get_num_tolerated_disk_barrier_failures(
-					flags));
-		}
-		up_read(&sinfo->groups_sem);
-	}
-
-	return num_tolerated_disk_barrier_failures;
-}
-
 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
 {
 	struct list_head *head;
@@ -3732,12 +3680,12 @@ int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
 		btrfs_set_stack_device_io_width(dev_item, dev->io_width);
 		btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
 		memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
-		memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
+		memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_FSID_SIZE);
 
 		flags = btrfs_super_flags(sb);
 		btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
 
-		ret = write_dev_supers(dev, sb, 0, max_mirrors);
+		ret = write_dev_supers(dev, sb, max_mirrors);
 		if (ret)
 			total_errors++;
 	}
@@ -3760,7 +3708,7 @@ int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
 		if (!dev->in_fs_metadata || !dev->writeable)
 			continue;
 
-		ret = write_dev_supers(dev, sb, 1, max_mirrors);
+		ret = wait_dev_supers(dev, max_mirrors);
 		if (ret)
 			total_errors++;
 	}
@@ -3995,7 +3943,6 @@ void close_ctree(struct btrfs_fs_info *fs_info)
 	__btrfs_free_block_rsv(root->orphan_block_rsv);
 	root->orphan_block_rsv = NULL;
 
-	mutex_lock(&fs_info->chunk_mutex);
 	while (!list_empty(&fs_info->pinned_chunks)) {
 		struct extent_map *em;
 
@@ -4004,7 +3951,6 @@ void close_ctree(struct btrfs_fs_info *fs_info)
 		list_del_init(&em->list);
 		free_extent_map(em);
 	}
-	mutex_unlock(&fs_info->chunk_mutex);
 }
 
 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
@@ -4053,7 +3999,7 @@ void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
 					 fs_info->dirty_metadata_batch);
 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
 	if (btrfs_header_level(buf) == 0 && check_leaf(root, buf)) {
-		btrfs_print_leaf(fs_info, buf);
+		btrfs_print_leaf(buf);
 		ASSERT(0);
 	}
 #endif
@@ -4173,7 +4119,7 @@ static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info)
 		ret = -EINVAL;
 	}
 
-	if (memcmp(fs_info->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
+	if (memcmp(fs_info->fsid, sb->dev_item.fsid, BTRFS_FSID_SIZE) != 0) {
 		btrfs_err(fs_info,
 			   "dev_item UUID does not match fsid: %pU != %pU",
 			   fs_info->fsid, sb->dev_item.fsid);
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 0a634d3ffc16..7f7c35d6347a 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -25,6 +25,14 @@
 #define BTRFS_SUPER_MIRROR_MAX	 3
 #define BTRFS_SUPER_MIRROR_SHIFT 12
 
+/*
+ * Fixed blocksize for all devices, applies to specific ways of reading
+ * metadata like superblock. Must meet the set_blocksize requirements.
+ *
+ * Do not change.
+ */
+#define BTRFS_BDEV_BLOCKSIZE	(4096)
+
 enum btrfs_wq_endio_type {
 	BTRFS_WQ_ENDIO_DATA = 0,
 	BTRFS_WQ_ENDIO_METADATA = 1,
@@ -142,8 +150,6 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
 int btree_lock_page_hook(struct page *page, void *data,
 				void (*flush_fn)(void *));
 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
-int btrfs_calc_num_tolerated_disk_barrier_failures(
-	struct btrfs_fs_info *fs_info);
 int __init btrfs_end_io_wq_init(void);
 void btrfs_end_io_wq_exit(void);
 
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index e3b0b4196d3d..e2d7e86b51d1 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1148,6 +1148,64 @@ static int convert_extent_item_v0(struct btrfs_trans_handle *trans,
 }
 #endif
 
+/*
+ * is_data == BTRFS_REF_TYPE_BLOCK, tree block type is required,
+ * is_data == BTRFS_REF_TYPE_DATA, data type is requried,
+ * is_data == BTRFS_REF_TYPE_ANY, either type is OK.
+ */
+int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
+				     struct btrfs_extent_inline_ref *iref,
+				     enum btrfs_inline_ref_type is_data)
+{
+	int type = btrfs_extent_inline_ref_type(eb, iref);
+	u64 offset = btrfs_extent_inline_ref_offset(eb, iref);
+
+	if (type == BTRFS_TREE_BLOCK_REF_KEY ||
+	    type == BTRFS_SHARED_BLOCK_REF_KEY ||
+	    type == BTRFS_SHARED_DATA_REF_KEY ||
+	    type == BTRFS_EXTENT_DATA_REF_KEY) {
+		if (is_data == BTRFS_REF_TYPE_BLOCK) {
+			if (type == BTRFS_TREE_BLOCK_REF_KEY)
+				return type;
+			if (type == BTRFS_SHARED_BLOCK_REF_KEY) {
+				ASSERT(eb->fs_info);
+				/*
+				 * Every shared one has parent tree
+				 * block, which must be aligned to
+				 * nodesize.
+				 */
+				if (offset &&
+				    IS_ALIGNED(offset, eb->fs_info->nodesize))
+					return type;
+			}
+		} else if (is_data == BTRFS_REF_TYPE_DATA) {
+			if (type == BTRFS_EXTENT_DATA_REF_KEY)
+				return type;
+			if (type == BTRFS_SHARED_DATA_REF_KEY) {
+				ASSERT(eb->fs_info);
+				/*
+				 * Every shared one has parent tree
+				 * block, which must be aligned to
+				 * nodesize.
+				 */
+				if (offset &&
+				    IS_ALIGNED(offset, eb->fs_info->nodesize))
+					return type;
+			}
+		} else {
+			ASSERT(is_data == BTRFS_REF_TYPE_ANY);
+			return type;
+		}
+	}
+
+	btrfs_print_leaf((struct extent_buffer *)eb);
+	btrfs_err(eb->fs_info, "eb %llu invalid extent inline ref type %d",
+		  eb->start, type);
+	WARN_ON(1);
+
+	return BTRFS_REF_TYPE_INVALID;
+}
+
 static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset)
 {
 	u32 high_crc = ~(u32)0;
@@ -1417,12 +1475,18 @@ static noinline u32 extent_data_ref_count(struct btrfs_path *path,
 	struct btrfs_extent_data_ref *ref1;
 	struct btrfs_shared_data_ref *ref2;
 	u32 num_refs = 0;
+	int type;
 
 	leaf = path->nodes[0];
 	btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
 	if (iref) {
-		if (btrfs_extent_inline_ref_type(leaf, iref) ==
-		    BTRFS_EXTENT_DATA_REF_KEY) {
+		/*
+		 * If type is invalid, we should have bailed out earlier than
+		 * this call.
+		 */
+		type = btrfs_get_extent_inline_ref_type(leaf, iref, BTRFS_REF_TYPE_DATA);
+		ASSERT(type != BTRFS_REF_TYPE_INVALID);
+		if (type == BTRFS_EXTENT_DATA_REF_KEY) {
 			ref1 = (struct btrfs_extent_data_ref *)(&iref->offset);
 			num_refs = btrfs_extent_data_ref_count(leaf, ref1);
 		} else {
@@ -1583,6 +1647,7 @@ int lookup_inline_extent_backref(struct btrfs_trans_handle *trans,
 	int ret;
 	int err = 0;
 	bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA);
+	int needed;
 
 	key.objectid = bytenr;
 	key.type = BTRFS_EXTENT_ITEM_KEY;
@@ -1674,6 +1739,11 @@ again:
 		BUG_ON(ptr > end);
 	}
 
+	if (owner >= BTRFS_FIRST_FREE_OBJECTID)
+		needed = BTRFS_REF_TYPE_DATA;
+	else
+		needed = BTRFS_REF_TYPE_BLOCK;
+
 	err = -ENOENT;
 	while (1) {
 		if (ptr >= end) {
@@ -1681,7 +1751,12 @@ again:
 			break;
 		}
 		iref = (struct btrfs_extent_inline_ref *)ptr;
-		type = btrfs_extent_inline_ref_type(leaf, iref);
+		type = btrfs_get_extent_inline_ref_type(leaf, iref, needed);
+		if (type == BTRFS_REF_TYPE_INVALID) {
+			err = -EINVAL;
+			goto out;
+		}
+
 		if (want < type)
 			break;
 		if (want > type) {
@@ -1873,7 +1948,12 @@ void update_inline_extent_backref(struct btrfs_fs_info *fs_info,
 	if (extent_op)
 		__run_delayed_extent_op(extent_op, leaf, ei);
 
-	type = btrfs_extent_inline_ref_type(leaf, iref);
+	/*
+	 * If type is invalid, we should have bailed out after
+	 * lookup_inline_extent_backref().
+	 */
+	type = btrfs_get_extent_inline_ref_type(leaf, iref, BTRFS_REF_TYPE_ANY);
+	ASSERT(type != BTRFS_REF_TYPE_INVALID);
 
 	if (type == BTRFS_EXTENT_DATA_REF_KEY) {
 		dref = (struct btrfs_extent_data_ref *)(&iref->offset);
@@ -3158,6 +3238,7 @@ static noinline int check_committed_ref(struct btrfs_root *root,
 	struct btrfs_extent_item *ei;
 	struct btrfs_key key;
 	u32 item_size;
+	int type;
 	int ret;
 
 	key.objectid = bytenr;
@@ -3199,8 +3280,9 @@ static noinline int check_committed_ref(struct btrfs_root *root,
 		goto out;
 
 	iref = (struct btrfs_extent_inline_ref *)(ei + 1);
-	if (btrfs_extent_inline_ref_type(leaf, iref) !=
-	    BTRFS_EXTENT_DATA_REF_KEY)
+
+	type = btrfs_get_extent_inline_ref_type(leaf, iref, BTRFS_REF_TYPE_DATA);
+	if (type != BTRFS_EXTENT_DATA_REF_KEY)
 		goto out;
 
 	ref = (struct btrfs_extent_data_ref *)(&iref->offset);
@@ -4199,9 +4281,9 @@ static u64 btrfs_space_info_used(struct btrfs_space_info *s_info,
 
 int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes)
 {
-	struct btrfs_space_info *data_sinfo;
 	struct btrfs_root *root = inode->root;
 	struct btrfs_fs_info *fs_info = root->fs_info;
+	struct btrfs_space_info *data_sinfo = fs_info->data_sinfo;
 	u64 used;
 	int ret = 0;
 	int need_commit = 2;
@@ -4215,10 +4297,6 @@ int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes)
 		ASSERT(current->journal_info);
 	}
 
-	data_sinfo = fs_info->data_sinfo;
-	if (!data_sinfo)
-		goto alloc;
-
 again:
 	/* make sure we have enough space to handle the data first */
 	spin_lock(&data_sinfo->lock);
@@ -4236,7 +4314,7 @@ again:
 
 			data_sinfo->force_alloc = CHUNK_ALLOC_FORCE;
 			spin_unlock(&data_sinfo->lock);
-alloc:
+
 			alloc_target = btrfs_data_alloc_profile(fs_info);
 			/*
 			 * It is ugly that we don't call nolock join
@@ -4264,9 +4342,6 @@ alloc:
 				}
 			}
 
-			if (!data_sinfo)
-				data_sinfo = fs_info->data_sinfo;
-
 			goto again;
 		}
 
@@ -4425,8 +4500,7 @@ static int should_alloc_chunk(struct btrfs_fs_info *fs_info,
 			      struct btrfs_space_info *sinfo, int force)
 {
 	struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
-	u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly;
-	u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved;
+	u64 bytes_used = btrfs_space_info_used(sinfo, false);
 	u64 thresh;
 
 	if (force == CHUNK_ALLOC_FORCE)
@@ -4438,7 +4512,7 @@ static int should_alloc_chunk(struct btrfs_fs_info *fs_info,
 	 * global_rsv, it doesn't change except when the transaction commits.
 	 */
 	if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA)
-		num_allocated += calc_global_rsv_need_space(global_rsv);
+		bytes_used += calc_global_rsv_need_space(global_rsv);
 
 	/*
 	 * in limited mode, we want to have some free space up to
@@ -4448,11 +4522,11 @@ static int should_alloc_chunk(struct btrfs_fs_info *fs_info,
 		thresh = btrfs_super_total_bytes(fs_info->super_copy);
 		thresh = max_t(u64, SZ_64M, div_factor_fine(thresh, 1));
 
-		if (num_bytes - num_allocated < thresh)
+		if (sinfo->total_bytes - bytes_used < thresh)
 			return 1;
 	}
 
-	if (num_allocated + SZ_2M < div_factor(num_bytes, 8))
+	if (bytes_used + SZ_2M < div_factor(sinfo->total_bytes, 8))
 		return 0;
 	return 1;
 }
@@ -4904,9 +4978,14 @@ struct reserve_ticket {
 	wait_queue_head_t wait;
 };
 
-static int flush_space(struct btrfs_fs_info *fs_info,
+/*
+ * Try to flush some data based on policy set by @state. This is only advisory
+ * and may fail for various reasons. The caller is supposed to examine the
+ * state of @space_info to detect the outcome.
+ */
+static void flush_space(struct btrfs_fs_info *fs_info,
 		       struct btrfs_space_info *space_info, u64 num_bytes,
-		       u64 orig_bytes, int state)
+		       int state)
 {
 	struct btrfs_root *root = fs_info->extent_root;
 	struct btrfs_trans_handle *trans;
@@ -4931,7 +5010,7 @@ static int flush_space(struct btrfs_fs_info *fs_info,
 		break;
 	case FLUSH_DELALLOC:
 	case FLUSH_DELALLOC_WAIT:
-		shrink_delalloc(fs_info, num_bytes * 2, orig_bytes,
+		shrink_delalloc(fs_info, num_bytes * 2, num_bytes,
 				state == FLUSH_DELALLOC_WAIT);
 		break;
 	case ALLOC_CHUNK:
@@ -4949,16 +5028,16 @@ static int flush_space(struct btrfs_fs_info *fs_info,
 		break;
 	case COMMIT_TRANS:
 		ret = may_commit_transaction(fs_info, space_info,
-					     orig_bytes, 0);
+					     num_bytes, 0);
 		break;
 	default:
 		ret = -ENOSPC;
 		break;
 	}
 
-	trace_btrfs_flush_space(fs_info, space_info->flags, num_bytes,
-				orig_bytes, state, ret);
-	return ret;
+	trace_btrfs_flush_space(fs_info, space_info->flags, num_bytes, state,
+				ret);
+	return;
 }
 
 static inline u64
@@ -5060,11 +5139,7 @@ static void btrfs_async_reclaim_metadata_space(struct work_struct *work)
 
 	flush_state = FLUSH_DELAYED_ITEMS_NR;
 	do {
-		struct reserve_ticket *ticket;
-		int ret;
-
-		ret = flush_space(fs_info, space_info, to_reclaim, to_reclaim,
-				  flush_state);
+		flush_space(fs_info, space_info, to_reclaim, flush_state);
 		spin_lock(&space_info->lock);
 		if (list_empty(&space_info->tickets)) {
 			space_info->flush = 0;
@@ -5074,8 +5149,6 @@ static void btrfs_async_reclaim_metadata_space(struct work_struct *work)
 		to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info,
 							      space_info,
 							      false);
-		ticket = list_first_entry(&space_info->tickets,
-					  struct reserve_ticket, list);
 		if (last_tickets_id == space_info->tickets_id) {
 			flush_state++;
 		} else {
@@ -5120,8 +5193,7 @@ static void priority_reclaim_metadata_space(struct btrfs_fs_info *fs_info,
 	spin_unlock(&space_info->lock);
 
 	do {
-		flush_space(fs_info, space_info, to_reclaim, to_reclaim,
-			    flush_state);
+		flush_space(fs_info, space_info, to_reclaim, flush_state);
 		flush_state++;
 		spin_lock(&space_info->lock);
 		if (ticket->bytes == 0) {
@@ -6664,19 +6736,20 @@ fetch_cluster_info(struct btrfs_fs_info *fs_info,
 		   struct btrfs_space_info *space_info, u64 *empty_cluster)
 {
 	struct btrfs_free_cluster *ret = NULL;
-	bool ssd = btrfs_test_opt(fs_info, SSD);
 
 	*empty_cluster = 0;
 	if (btrfs_mixed_space_info(space_info))
 		return ret;
 
-	if (ssd)
-		*empty_cluster = SZ_2M;
 	if (space_info->flags & BTRFS_BLOCK_GROUP_METADATA) {
 		ret = &fs_info->meta_alloc_cluster;
-		if (!ssd)
+		if (btrfs_test_opt(fs_info, SSD))
+			*empty_cluster = SZ_2M;
+		else
 			*empty_cluster = SZ_64K;
-	} else if ((space_info->flags & BTRFS_BLOCK_GROUP_DATA) && ssd) {
+	} else if ((space_info->flags & BTRFS_BLOCK_GROUP_DATA) &&
+		   btrfs_test_opt(fs_info, SSD_SPREAD)) {
+		*empty_cluster = SZ_2M;
 		ret = &fs_info->data_alloc_cluster;
 	}
 
@@ -6755,7 +6828,7 @@ static int unpin_extent_range(struct btrfs_fs_info *fs_info,
 		if (!readonly && return_free_space &&
 		    global_rsv->space_info == space_info) {
 			u64 to_add = len;
-			WARN_ON(!return_free_space);
+
 			spin_lock(&global_rsv->lock);
 			if (!global_rsv->full) {
 				to_add = min(len, global_rsv->size -
@@ -6841,7 +6914,7 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
 		if (ret) {
 			const char *errstr = btrfs_decode_error(ret);
 			btrfs_warn(fs_info,
-				   "Discard failed while removing blockgroup: errno=%d %s\n",
+			   "discard failed while removing blockgroup: errno=%d %s",
 				   ret, errstr);
 		}
 	}
@@ -6969,7 +7042,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
 					  "umm, got %d back from search, was looking for %llu",
 					  ret, bytenr);
 				if (ret > 0)
-					btrfs_print_leaf(info, path->nodes[0]);
+					btrfs_print_leaf(path->nodes[0]);
 			}
 			if (ret < 0) {
 				btrfs_abort_transaction(trans, ret);
@@ -6978,7 +7051,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
 			extent_slot = path->slots[0];
 		}
 	} else if (WARN_ON(ret == -ENOENT)) {
-		btrfs_print_leaf(info, path->nodes[0]);
+		btrfs_print_leaf(path->nodes[0]);
 		btrfs_err(info,
 			"unable to find ref byte nr %llu parent %llu root %llu  owner %llu offset %llu",
 			bytenr, parent, root_objectid, owner_objectid,
@@ -7015,7 +7088,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
 			btrfs_err(info,
 				  "umm, got %d back from search, was looking for %llu",
 				ret, bytenr);
-			btrfs_print_leaf(info, path->nodes[0]);
+			btrfs_print_leaf(path->nodes[0]);
 		}
 		if (ret < 0) {
 			btrfs_abort_transaction(trans, ret);
@@ -9193,7 +9266,7 @@ int btrfs_drop_snapshot(struct btrfs_root *root,
 	if (err)
 		goto out_end_trans;
 
-	ret = btrfs_del_root(trans, tree_root, &root->root_key);
+	ret = btrfs_del_root(trans, fs_info, &root->root_key);
 	if (ret) {
 		btrfs_abort_transaction(trans, ret);
 		goto out_end_trans;
@@ -9952,11 +10025,8 @@ btrfs_create_block_group_cache(struct btrfs_fs_info *fs_info,
 	cache->key.offset = size;
 	cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
 
-	cache->sectorsize = fs_info->sectorsize;
 	cache->fs_info = fs_info;
-	cache->full_stripe_len = btrfs_full_stripe_len(fs_info,
-						       &fs_info->mapping_tree,
-						       start);
+	cache->full_stripe_len = btrfs_full_stripe_len(fs_info, start);
 	set_free_space_tree_thresholds(cache);
 
 	atomic_set(&cache->count, 1);
@@ -10192,8 +10262,7 @@ next:
 
 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
 			   struct btrfs_fs_info *fs_info, u64 bytes_used,
-			   u64 type, u64 chunk_objectid, u64 chunk_offset,
-			   u64 size)
+			   u64 type, u64 chunk_offset, u64 size)
 {
 	struct btrfs_block_group_cache *cache;
 	int ret;
@@ -10205,7 +10274,8 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
 		return -ENOMEM;
 
 	btrfs_set_block_group_used(&cache->item, bytes_used);
-	btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid);
+	btrfs_set_block_group_chunk_objectid(&cache->item,
+					     BTRFS_FIRST_CHUNK_TREE_OBJECTID);
 	btrfs_set_block_group_flags(&cache->item, type);
 
 	cache->flags = type;
@@ -11001,14 +11071,14 @@ int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range)
 }
 
 /*
- * btrfs_{start,end}_write_no_snapshoting() are similar to
+ * btrfs_{start,end}_write_no_snapshotting() are similar to
  * mnt_{want,drop}_write(), they are used to prevent some tasks from writing
  * data into the page cache through nocow before the subvolume is snapshoted,
  * but flush the data into disk after the snapshot creation, or to prevent
- * operations while snapshoting is ongoing and that cause the snapshot to be
+ * operations while snapshotting is ongoing and that cause the snapshot to be
  * inconsistent (writes followed by expanding truncates for example).
  */
-void btrfs_end_write_no_snapshoting(struct btrfs_root *root)
+void btrfs_end_write_no_snapshotting(struct btrfs_root *root)
 {
 	percpu_counter_dec(&root->subv_writers->counter);
 	/*
@@ -11019,9 +11089,9 @@ void btrfs_end_write_no_snapshoting(struct btrfs_root *root)
 		wake_up(&root->subv_writers->wait);
 }
 
-int btrfs_start_write_no_snapshoting(struct btrfs_root *root)
+int btrfs_start_write_no_snapshotting(struct btrfs_root *root)
 {
-	if (atomic_read(&root->will_be_snapshoted))
+	if (atomic_read(&root->will_be_snapshotted))
 		return 0;
 
 	percpu_counter_inc(&root->subv_writers->counter);
@@ -11029,14 +11099,14 @@ int btrfs_start_write_no_snapshoting(struct btrfs_root *root)
 	 * Make sure counter is updated before we check for snapshot creation.
 	 */
 	smp_mb();
-	if (atomic_read(&root->will_be_snapshoted)) {
-		btrfs_end_write_no_snapshoting(root);
+	if (atomic_read(&root->will_be_snapshotted)) {
+		btrfs_end_write_no_snapshotting(root);
 		return 0;
 	}
 	return 1;
 }
 
-static int wait_snapshoting_atomic_t(atomic_t *a)
+static int wait_snapshotting_atomic_t(atomic_t *a)
 {
 	schedule();
 	return 0;
@@ -11047,11 +11117,11 @@ void btrfs_wait_for_snapshot_creation(struct btrfs_root *root)
 	while (true) {
 		int ret;
 
-		ret = btrfs_start_write_no_snapshoting(root);
+		ret = btrfs_start_write_no_snapshotting(root);
 		if (ret)
 			break;
-		wait_on_atomic_t(&root->will_be_snapshoted,
-				 wait_snapshoting_atomic_t,
+		wait_on_atomic_t(&root->will_be_snapshotted,
+				 wait_snapshotting_atomic_t,
 				 TASK_UNINTERRUPTIBLE);
 	}
 }
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 42b12a85ab49..0f077c5db58e 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -20,7 +20,6 @@
 #include "locking.h"
 #include "rcu-string.h"
 #include "backref.h"
-#include "transaction.h"
 
 static struct kmem_cache *extent_state_cache;
 static struct kmem_cache *extent_buffer_cache;
@@ -1998,7 +1997,7 @@ int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
 	 * read repair operation.
 	 */
 	btrfs_bio_counter_inc_blocked(fs_info);
-	if (btrfs_is_parity_mirror(fs_info, logical, length, mirror_num)) {
+	if (btrfs_is_parity_mirror(fs_info, logical, length)) {
 		/*
 		 * Note that we don't use BTRFS_MAP_WRITE because it's supposed
 		 * to update all raid stripes, but here we just want to correct
@@ -2757,7 +2756,10 @@ static int merge_bio(struct extent_io_tree *tree, struct page *page,
 
 }
 
-static int submit_extent_page(int op, int op_flags, struct extent_io_tree *tree,
+/*
+ * @opf:	bio REQ_OP_* and REQ_* flags as one value
+ */
+static int submit_extent_page(unsigned int opf, struct extent_io_tree *tree,
 			      struct writeback_control *wbc,
 			      struct page *page, sector_t sector,
 			      size_t size, unsigned long offset,
@@ -2804,7 +2806,7 @@ static int submit_extent_page(int op, int op_flags, struct extent_io_tree *tree,
 	bio->bi_end_io = end_io_func;
 	bio->bi_private = tree;
 	bio->bi_write_hint = page->mapping->host->i_write_hint;
-	bio_set_op_attrs(bio, op, op_flags);
+	bio->bi_opf = opf;
 	if (wbc) {
 		wbc_init_bio(wbc, bio);
 		wbc_account_io(wbc, page, page_size);
@@ -2878,7 +2880,7 @@ static int __do_readpage(struct extent_io_tree *tree,
 			 get_extent_t *get_extent,
 			 struct extent_map **em_cached,
 			 struct bio **bio, int mirror_num,
-			 unsigned long *bio_flags, int read_flags,
+			 unsigned long *bio_flags, unsigned int read_flags,
 			 u64 *prev_em_start)
 {
 	struct inode *inode = page->mapping->host;
@@ -3059,7 +3061,7 @@ static int __do_readpage(struct extent_io_tree *tree,
 			continue;
 		}
 
-		ret = submit_extent_page(REQ_OP_READ, read_flags, tree, NULL,
+		ret = submit_extent_page(REQ_OP_READ | read_flags, tree, NULL,
 					 page, sector, disk_io_size, pg_offset,
 					 bdev, bio,
 					 end_bio_extent_readpage, mirror_num,
@@ -3164,7 +3166,8 @@ static int __extent_read_full_page(struct extent_io_tree *tree,
 				   struct page *page,
 				   get_extent_t *get_extent,
 				   struct bio **bio, int mirror_num,
-				   unsigned long *bio_flags, int read_flags)
+				   unsigned long *bio_flags,
+				   unsigned int read_flags)
 {
 	struct inode *inode = page->mapping->host;
 	struct btrfs_ordered_extent *ordered;
@@ -3311,7 +3314,7 @@ static noinline_for_stack int __extent_writepage_io(struct inode *inode,
 				 struct extent_page_data *epd,
 				 loff_t i_size,
 				 unsigned long nr_written,
-				 int write_flags, int *nr_ret)
+				 unsigned int write_flags, int *nr_ret)
 {
 	struct extent_io_tree *tree = epd->tree;
 	u64 start = page_offset(page);
@@ -3427,7 +3430,7 @@ static noinline_for_stack int __extent_writepage_io(struct inode *inode,
 			       page->index, cur, end);
 		}
 
-		ret = submit_extent_page(REQ_OP_WRITE, write_flags, tree, wbc,
+		ret = submit_extent_page(REQ_OP_WRITE | write_flags, tree, wbc,
 					 page, sector, iosize, pg_offset,
 					 bdev, &epd->bio,
 					 end_bio_extent_writepage,
@@ -3465,7 +3468,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
 	size_t pg_offset = 0;
 	loff_t i_size = i_size_read(inode);
 	unsigned long end_index = i_size >> PAGE_SHIFT;
-	int write_flags = 0;
+	unsigned int write_flags = 0;
 	unsigned long nr_written = 0;
 
 	if (wbc->sync_mode == WB_SYNC_ALL)
@@ -3715,7 +3718,7 @@ static noinline_for_stack int write_one_eb(struct extent_buffer *eb,
 	unsigned long i, num_pages;
 	unsigned long bio_flags = 0;
 	unsigned long start, end;
-	int write_flags = (epd->sync_io ? REQ_SYNC : 0) | REQ_META;
+	unsigned int write_flags = (epd->sync_io ? REQ_SYNC : 0) | REQ_META;
 	int ret = 0;
 
 	clear_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags);
@@ -3745,7 +3748,7 @@ static noinline_for_stack int write_one_eb(struct extent_buffer *eb,
 
 		clear_page_dirty_for_io(p);
 		set_page_writeback(p);
-		ret = submit_extent_page(REQ_OP_WRITE, write_flags, tree, wbc,
+		ret = submit_extent_page(REQ_OP_WRITE | write_flags, tree, wbc,
 					 p, offset >> 9, PAGE_SIZE, 0, bdev,
 					 &epd->bio,
 					 end_bio_extent_buffer_writepage,
@@ -4606,36 +4609,21 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 			flags |= (FIEMAP_EXTENT_DELALLOC |
 				  FIEMAP_EXTENT_UNKNOWN);
 		} else if (fieinfo->fi_extents_max) {
-			struct btrfs_trans_handle *trans;
-
 			u64 bytenr = em->block_start -
 				(em->start - em->orig_start);
 
 			disko = em->block_start + offset_in_extent;
 
 			/*
-			 * We need a trans handle to get delayed refs
-			 */
-			trans = btrfs_join_transaction(root);
-			/*
-			 * It's OK if we can't start a trans we can still check
-			 * from commit_root
-			 */
-			if (IS_ERR(trans))
-				trans = NULL;
-
-			/*
 			 * As btrfs supports shared space, this information
 			 * can be exported to userspace tools via
 			 * flag FIEMAP_EXTENT_SHARED.  If fi_extents_max == 0
 			 * then we're just getting a count and we can skip the
 			 * lookup stuff.
 			 */
-			ret = btrfs_check_shared(trans, root->fs_info,
-					root->objectid,
-					btrfs_ino(BTRFS_I(inode)), bytenr);
-			if (trans)
-				btrfs_end_transaction(trans);
+			ret = btrfs_check_shared(root,
+						 btrfs_ino(BTRFS_I(inode)),
+						 bytenr);
 			if (ret < 0)
 				goto out_free;
 			if (ret)
@@ -5405,9 +5393,8 @@ unlock_exit:
 	return ret;
 }
 
-void read_extent_buffer(struct extent_buffer *eb, void *dstv,
-			unsigned long start,
-			unsigned long len)
+void read_extent_buffer(const struct extent_buffer *eb, void *dstv,
+			unsigned long start, unsigned long len)
 {
 	size_t cur;
 	size_t offset;
@@ -5417,8 +5404,12 @@ void read_extent_buffer(struct extent_buffer *eb, void *dstv,
 	size_t start_offset = eb->start & ((u64)PAGE_SIZE - 1);
 	unsigned long i = (start_offset + start) >> PAGE_SHIFT;
 
-	WARN_ON(start > eb->len);
-	WARN_ON(start + len > eb->start + eb->len);
+	if (start + len > eb->len) {
+		WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, wanted %lu %lu\n",
+		     eb->start, eb->len, start, len);
+		memset(dst, 0, len);
+		return;
+	}
 
 	offset = (start_offset + start) & (PAGE_SIZE - 1);
 
@@ -5436,9 +5427,9 @@ void read_extent_buffer(struct extent_buffer *eb, void *dstv,
 	}
 }
 
-int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dstv,
-			unsigned long start,
-			unsigned long len)
+int read_extent_buffer_to_user(const struct extent_buffer *eb,
+			       void __user *dstv,
+			       unsigned long start, unsigned long len)
 {
 	size_t cur;
 	size_t offset;
@@ -5478,10 +5469,10 @@ int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dstv,
  * return 1 if the item spans two pages.
  * return -EINVAL otherwise.
  */
-int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start,
-			       unsigned long min_len, char **map,
-			       unsigned long *map_start,
-			       unsigned long *map_len)
+int map_private_extent_buffer(const struct extent_buffer *eb,
+			      unsigned long start, unsigned long min_len,
+			      char **map, unsigned long *map_start,
+			      unsigned long *map_len)
 {
 	size_t offset = start & (PAGE_SIZE - 1);
 	char *kaddr;
@@ -5491,6 +5482,12 @@ int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start,
 	unsigned long end_i = (start_offset + start + min_len - 1) >>
 		PAGE_SHIFT;
 
+	if (start + min_len > eb->len) {
+		WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, wanted %lu %lu\n",
+		       eb->start, eb->len, start, min_len);
+		return -EINVAL;
+	}
+
 	if (i != end_i)
 		return 1;
 
@@ -5502,12 +5499,6 @@ int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start,
 		*map_start = ((u64)i << PAGE_SHIFT) - start_offset;
 	}
 
-	if (start + min_len > eb->len) {
-		WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, wanted %lu %lu\n",
-		       eb->start, eb->len, start, min_len);
-		return -EINVAL;
-	}
-
 	p = eb->pages[i];
 	kaddr = page_address(p);
 	*map = kaddr + offset;
@@ -5515,9 +5506,8 @@ int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start,
 	return 0;
 }
 
-int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
-			  unsigned long start,
-			  unsigned long len)
+int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
+			 unsigned long start, unsigned long len)
 {
 	size_t cur;
 	size_t offset;
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 4f030912f3ef..faffa28ba707 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -449,14 +449,13 @@ static inline void extent_buffer_get(struct extent_buffer *eb)
 	atomic_inc(&eb->refs);
 }
 
-int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
-			  unsigned long start,
-			  unsigned long len);
-void read_extent_buffer(struct extent_buffer *eb, void *dst,
+int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
+			 unsigned long start, unsigned long len);
+void read_extent_buffer(const struct extent_buffer *eb, void *dst,
 			unsigned long start,
 			unsigned long len);
-int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
-			       unsigned long start,
+int read_extent_buffer_to_user(const struct extent_buffer *eb,
+			       void __user *dst, unsigned long start,
 			       unsigned long len);
 void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
 void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
@@ -486,10 +485,10 @@ void set_extent_buffer_uptodate(struct extent_buffer *eb);
 void clear_extent_buffer_uptodate(struct extent_buffer *eb);
 int extent_buffer_uptodate(struct extent_buffer *eb);
 int extent_buffer_under_io(struct extent_buffer *eb);
-int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
-		      unsigned long min_len, char **map,
-		      unsigned long *map_start,
-		      unsigned long *map_len);
+int map_private_extent_buffer(const struct extent_buffer *eb,
+			      unsigned long offset, unsigned long min_len,
+			      char **map, unsigned long *map_start,
+			      unsigned long *map_len);
 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
 void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
 void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 9e75d8a39aac..74fd7756cff3 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1536,7 +1536,7 @@ static noinline int check_can_nocow(struct btrfs_inode *inode, loff_t pos,
 	u64 num_bytes;
 	int ret;
 
-	ret = btrfs_start_write_no_snapshoting(root);
+	ret = btrfs_start_write_no_snapshotting(root);
 	if (!ret)
 		return -ENOSPC;
 
@@ -1561,7 +1561,7 @@ static noinline int check_can_nocow(struct btrfs_inode *inode, loff_t pos,
 			NULL, NULL, NULL);
 	if (ret <= 0) {
 		ret = 0;
-		btrfs_end_write_no_snapshoting(root);
+		btrfs_end_write_no_snapshotting(root);
 	} else {
 		*write_bytes = min_t(size_t, *write_bytes ,
 				     num_bytes - pos + lockstart);
@@ -1664,7 +1664,7 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file,
 						data_reserved, pos,
 						write_bytes);
 			else
-				btrfs_end_write_no_snapshoting(root);
+				btrfs_end_write_no_snapshotting(root);
 			break;
 		}
 
@@ -1767,7 +1767,7 @@ again:
 
 		release_bytes = 0;
 		if (only_release_metadata)
-			btrfs_end_write_no_snapshoting(root);
+			btrfs_end_write_no_snapshotting(root);
 
 		if (only_release_metadata && copied > 0) {
 			lockstart = round_down(pos,
@@ -1797,7 +1797,7 @@ again:
 
 	if (release_bytes) {
 		if (only_release_metadata) {
-			btrfs_end_write_no_snapshoting(root);
+			btrfs_end_write_no_snapshotting(root);
 			btrfs_delalloc_release_metadata(BTRFS_I(inode),
 					release_bytes);
 		} else {
@@ -1990,8 +1990,15 @@ out:
 
 int btrfs_release_file(struct inode *inode, struct file *filp)
 {
-	if (filp->private_data)
+	struct btrfs_file_private *private = filp->private_data;
+
+	if (private && private->trans)
 		btrfs_ioctl_trans_end(filp);
+	if (private && private->filldir_buf)
+		kfree(private->filldir_buf);
+	kfree(private);
+	filp->private_data = NULL;
+
 	/*
 	 * ordered_data_close is set by settattr when we are about to truncate
 	 * a file from a non-zero size to a zero size.  This tries to
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index c5e6180cdb8c..cdc9f4015ec3 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -709,7 +709,7 @@ static int __load_free_space_cache(struct btrfs_root *root, struct inode *inode,
 
 	if (!BTRFS_I(inode)->generation) {
 		btrfs_info(fs_info,
-			   "The free space cache file (%llu) is invalid. skip it\n",
+			   "the free space cache file (%llu) is invalid, skip it",
 			   offset);
 		return 0;
 	}
diff --git a/fs/btrfs/free-space-tree.c b/fs/btrfs/free-space-tree.c
index a5e34de06c2f..684f12247db7 100644
--- a/fs/btrfs/free-space-tree.c
+++ b/fs/btrfs/free-space-tree.c
@@ -1257,7 +1257,7 @@ int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info)
 	if (ret)
 		goto abort;
 
-	ret = btrfs_del_root(trans, tree_root, &free_space_root->root_key);
+	ret = btrfs_del_root(trans, fs_info, &free_space_root->root_key);
 	if (ret)
 		goto abort;
 
diff --git a/fs/btrfs/free-space-tree.h b/fs/btrfs/free-space-tree.h
index 54ffced3bce8..ba3787df43c3 100644
--- a/fs/btrfs/free-space-tree.h
+++ b/fs/btrfs/free-space-tree.h
@@ -44,7 +44,7 @@ int remove_from_free_space_tree(struct btrfs_trans_handle *trans,
 				struct btrfs_fs_info *fs_info,
 				u64 start, u64 size);
 
-/* Exposed for testing. */
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 struct btrfs_free_space_info *
 search_free_space_info(struct btrfs_trans_handle *trans,
 		       struct btrfs_fs_info *fs_info,
@@ -68,5 +68,6 @@ int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
 				  struct btrfs_path *path);
 int free_space_test_bit(struct btrfs_block_group_cache *block_group,
 			struct btrfs_path *path, u64 offset);
+#endif
 
 #endif
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 24bcd5cd9cf2..17ad018da0a2 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -392,20 +392,23 @@ static noinline int add_async_extent(struct async_cow *cow,
 	return 0;
 }
 
-static inline int inode_need_compress(struct inode *inode)
+static inline int inode_need_compress(struct inode *inode, u64 start, u64 end)
 {
 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
 
 	/* force compress */
 	if (btrfs_test_opt(fs_info, FORCE_COMPRESS))
 		return 1;
+	/* defrag ioctl */
+	if (BTRFS_I(inode)->defrag_compress)
+		return 1;
 	/* bad compression ratios */
 	if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS)
 		return 0;
 	if (btrfs_test_opt(fs_info, COMPRESS) ||
 	    BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS ||
-	    BTRFS_I(inode)->force_compress)
-		return 1;
+	    BTRFS_I(inode)->prop_compress)
+		return btrfs_compress_heuristic(inode, start, end);
 	return 0;
 }
 
@@ -503,7 +506,7 @@ again:
 	 * inode has not been flagged as nocompress.  This flag can
 	 * change at any time if we discover bad compression ratios.
 	 */
-	if (inode_need_compress(inode)) {
+	if (inode_need_compress(inode, start, end)) {
 		WARN_ON(pages);
 		pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS);
 		if (!pages) {
@@ -511,8 +514,10 @@ again:
 			goto cont;
 		}
 
-		if (BTRFS_I(inode)->force_compress)
-			compress_type = BTRFS_I(inode)->force_compress;
+		if (BTRFS_I(inode)->defrag_compress)
+			compress_type = BTRFS_I(inode)->defrag_compress;
+		else if (BTRFS_I(inode)->prop_compress)
+			compress_type = BTRFS_I(inode)->prop_compress;
 
 		/*
 		 * we need to call clear_page_dirty_for_io on each
@@ -645,7 +650,7 @@ cont:
 
 		/* flag the file so we don't compress in the future */
 		if (!btrfs_test_opt(fs_info, FORCE_COMPRESS) &&
-		    !(BTRFS_I(inode)->force_compress)) {
+		    !(BTRFS_I(inode)->prop_compress)) {
 			BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
 		}
 	}
@@ -1381,7 +1386,7 @@ next_slot:
 			 * we fall into common COW way.
 			 */
 			if (!nolock) {
-				err = btrfs_start_write_no_snapshoting(root);
+				err = btrfs_start_write_no_snapshotting(root);
 				if (!err)
 					goto out_check;
 			}
@@ -1393,12 +1398,12 @@ next_slot:
 			if (csum_exist_in_range(fs_info, disk_bytenr,
 						num_bytes)) {
 				if (!nolock)
-					btrfs_end_write_no_snapshoting(root);
+					btrfs_end_write_no_snapshotting(root);
 				goto out_check;
 			}
 			if (!btrfs_inc_nocow_writers(fs_info, disk_bytenr)) {
 				if (!nolock)
-					btrfs_end_write_no_snapshoting(root);
+					btrfs_end_write_no_snapshotting(root);
 				goto out_check;
 			}
 			nocow = 1;
@@ -1415,7 +1420,7 @@ out_check:
 		if (extent_end <= start) {
 			path->slots[0]++;
 			if (!nolock && nocow)
-				btrfs_end_write_no_snapshoting(root);
+				btrfs_end_write_no_snapshotting(root);
 			if (nocow)
 				btrfs_dec_nocow_writers(fs_info, disk_bytenr);
 			goto next_slot;
@@ -1438,7 +1443,7 @@ out_check:
 					     NULL);
 			if (ret) {
 				if (!nolock && nocow)
-					btrfs_end_write_no_snapshoting(root);
+					btrfs_end_write_no_snapshotting(root);
 				if (nocow)
 					btrfs_dec_nocow_writers(fs_info,
 								disk_bytenr);
@@ -1459,7 +1464,7 @@ out_check:
 					  BTRFS_ORDERED_PREALLOC);
 			if (IS_ERR(em)) {
 				if (!nolock && nocow)
-					btrfs_end_write_no_snapshoting(root);
+					btrfs_end_write_no_snapshotting(root);
 				if (nocow)
 					btrfs_dec_nocow_writers(fs_info,
 								disk_bytenr);
@@ -1499,7 +1504,7 @@ out_check:
 					     PAGE_UNLOCK | PAGE_SET_PRIVATE2);
 
 		if (!nolock && nocow)
-			btrfs_end_write_no_snapshoting(root);
+			btrfs_end_write_no_snapshotting(root);
 		cur_offset = extent_end;
 
 		/*
@@ -1576,7 +1581,7 @@ static int run_delalloc_range(void *private_data, struct page *locked_page,
 	} else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC && !force_cow) {
 		ret = run_delalloc_nocow(inode, locked_page, start, end,
 					 page_started, 0, nr_written);
-	} else if (!inode_need_compress(inode)) {
+	} else if (!inode_need_compress(inode, start, end)) {
 		ret = cow_file_range(inode, locked_page, start, end, end,
 				      page_started, nr_written, 1, NULL);
 	} else {
@@ -1796,10 +1801,11 @@ static void btrfs_clear_bit_hook(void *private_data,
 	u64 len = state->end + 1 - state->start;
 	u32 num_extents = count_max_extents(len);
 
-	spin_lock(&inode->lock);
-	if ((state->state & EXTENT_DEFRAG) && (*bits & EXTENT_DEFRAG))
+	if ((state->state & EXTENT_DEFRAG) && (*bits & EXTENT_DEFRAG)) {
+		spin_lock(&inode->lock);
 		inode->defrag_bytes -= len;
-	spin_unlock(&inode->lock);
+		spin_unlock(&inode->lock);
+	}
 
 	/*
 	 * set_bit and clear bit hooks normally require _irqsave/restore
@@ -3159,8 +3165,6 @@ zeroit:
 	memset(kaddr + pgoff, 1, len);
 	flush_dcache_page(page);
 	kunmap_atomic(kaddr);
-	if (csum_expected == 0)
-		return 0;
 	return -EIO;
 }
 
@@ -5055,7 +5059,7 @@ static int btrfs_setsize(struct inode *inode, struct iattr *attr)
 
 	if (newsize > oldsize) {
 		/*
-		 * Don't do an expanding truncate while snapshoting is ongoing.
+		 * Don't do an expanding truncate while snapshotting is ongoing.
 		 * This is to ensure the snapshot captures a fully consistent
 		 * state of this file - if the snapshot captures this expanding
 		 * truncation, it must capture all writes that happened before
@@ -5064,13 +5068,13 @@ static int btrfs_setsize(struct inode *inode, struct iattr *attr)
 		btrfs_wait_for_snapshot_creation(root);
 		ret = btrfs_cont_expand(inode, oldsize, newsize);
 		if (ret) {
-			btrfs_end_write_no_snapshoting(root);
+			btrfs_end_write_no_snapshotting(root);
 			return ret;
 		}
 
 		trans = btrfs_start_transaction(root, 1);
 		if (IS_ERR(trans)) {
-			btrfs_end_write_no_snapshoting(root);
+			btrfs_end_write_no_snapshotting(root);
 			return PTR_ERR(trans);
 		}
 
@@ -5078,7 +5082,7 @@ static int btrfs_setsize(struct inode *inode, struct iattr *attr)
 		btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL);
 		pagecache_isize_extended(inode, oldsize, newsize);
 		ret = btrfs_update_inode(trans, root, inode);
-		btrfs_end_write_no_snapshoting(root);
+		btrfs_end_write_no_snapshotting(root);
 		btrfs_end_transaction(trans);
 	} else {
 
@@ -5873,25 +5877,74 @@ unsigned char btrfs_filetype_table[] = {
 	DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
 };
 
+/*
+ * All this infrastructure exists because dir_emit can fault, and we are holding
+ * the tree lock when doing readdir.  For now just allocate a buffer and copy
+ * our information into that, and then dir_emit from the buffer.  This is
+ * similar to what NFS does, only we don't keep the buffer around in pagecache
+ * because I'm afraid I'll mess that up.  Long term we need to make filldir do
+ * copy_to_user_inatomic so we don't have to worry about page faulting under the
+ * tree lock.
+ */
+static int btrfs_opendir(struct inode *inode, struct file *file)
+{
+	struct btrfs_file_private *private;
+
+	private = kzalloc(sizeof(struct btrfs_file_private), GFP_KERNEL);
+	if (!private)
+		return -ENOMEM;
+	private->filldir_buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!private->filldir_buf) {
+		kfree(private);
+		return -ENOMEM;
+	}
+	file->private_data = private;
+	return 0;
+}
+
+struct dir_entry {
+	u64 ino;
+	u64 offset;
+	unsigned type;
+	int name_len;
+};
+
+static int btrfs_filldir(void *addr, int entries, struct dir_context *ctx)
+{
+	while (entries--) {
+		struct dir_entry *entry = addr;
+		char *name = (char *)(entry + 1);
+
+		ctx->pos = entry->offset;
+		if (!dir_emit(ctx, name, entry->name_len, entry->ino,
+			      entry->type))
+			return 1;
+		addr += sizeof(struct dir_entry) + entry->name_len;
+		ctx->pos++;
+	}
+	return 0;
+}
+
 static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
 {
 	struct inode *inode = file_inode(file);
 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
 	struct btrfs_root *root = BTRFS_I(inode)->root;
+	struct btrfs_file_private *private = file->private_data;
 	struct btrfs_dir_item *di;
 	struct btrfs_key key;
 	struct btrfs_key found_key;
 	struct btrfs_path *path;
+	void *addr;
 	struct list_head ins_list;
 	struct list_head del_list;
 	int ret;
 	struct extent_buffer *leaf;
 	int slot;
-	unsigned char d_type;
-	int over = 0;
-	char tmp_name[32];
 	char *name_ptr;
 	int name_len;
+	int entries = 0;
+	int total_len = 0;
 	bool put = false;
 	struct btrfs_key location;
 
@@ -5902,12 +5955,14 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
 	if (!path)
 		return -ENOMEM;
 
+	addr = private->filldir_buf;
 	path->reada = READA_FORWARD;
 
 	INIT_LIST_HEAD(&ins_list);
 	INIT_LIST_HEAD(&del_list);
 	put = btrfs_readdir_get_delayed_items(inode, &ins_list, &del_list);
 
+again:
 	key.type = BTRFS_DIR_INDEX_KEY;
 	key.offset = ctx->pos;
 	key.objectid = btrfs_ino(BTRFS_I(inode));
@@ -5917,6 +5972,8 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
 		goto err;
 
 	while (1) {
+		struct dir_entry *entry;
+
 		leaf = path->nodes[0];
 		slot = path->slots[0];
 		if (slot >= btrfs_header_nritems(leaf)) {
@@ -5938,41 +5995,43 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
 			goto next;
 		if (btrfs_should_delete_dir_index(&del_list, found_key.offset))
 			goto next;
-
-		ctx->pos = found_key.offset;
-
 		di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
 		if (verify_dir_item(fs_info, leaf, slot, di))
 			goto next;
 
 		name_len = btrfs_dir_name_len(leaf, di);
-		if (name_len <= sizeof(tmp_name)) {
-			name_ptr = tmp_name;
-		} else {
-			name_ptr = kmalloc(name_len, GFP_KERNEL);
-			if (!name_ptr) {
-				ret = -ENOMEM;
-				goto err;
-			}
+		if ((total_len + sizeof(struct dir_entry) + name_len) >=
+		    PAGE_SIZE) {
+			btrfs_release_path(path);
+			ret = btrfs_filldir(private->filldir_buf, entries, ctx);
+			if (ret)
+				goto nopos;
+			addr = private->filldir_buf;
+			entries = 0;
+			total_len = 0;
+			goto again;
 		}
+
+		entry = addr;
+		entry->name_len = name_len;
+		name_ptr = (char *)(entry + 1);
 		read_extent_buffer(leaf, name_ptr, (unsigned long)(di + 1),
 				   name_len);
-
-		d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
+		entry->type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
 		btrfs_dir_item_key_to_cpu(leaf, di, &location);
-
-		over = !dir_emit(ctx, name_ptr, name_len, location.objectid,
-				 d_type);
-
-		if (name_ptr != tmp_name)
-			kfree(name_ptr);
-
-		if (over)
-			goto nopos;
-		ctx->pos++;
+		entry->ino = location.objectid;
+		entry->offset = found_key.offset;
+		entries++;
+		addr += sizeof(struct dir_entry) + name_len;
+		total_len += sizeof(struct dir_entry) + name_len;
 next:
 		path->slots[0]++;
 	}
+	btrfs_release_path(path);
+
+	ret = btrfs_filldir(private->filldir_buf, entries, ctx);
+	if (ret)
+		goto nopos;
 
 	ret = btrfs_readdir_delayed_dir_index(ctx, &ins_list);
 	if (ret)
@@ -6185,6 +6244,37 @@ static int btrfs_insert_inode_locked(struct inode *inode)
 		   btrfs_find_actor, &args);
 }
 
+/*
+ * Inherit flags from the parent inode.
+ *
+ * Currently only the compression flags and the cow flags are inherited.
+ */
+static void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
+{
+	unsigned int flags;
+
+	if (!dir)
+		return;
+
+	flags = BTRFS_I(dir)->flags;
+
+	if (flags & BTRFS_INODE_NOCOMPRESS) {
+		BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
+		BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
+	} else if (flags & BTRFS_INODE_COMPRESS) {
+		BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
+		BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
+	}
+
+	if (flags & BTRFS_INODE_NODATACOW) {
+		BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
+		if (S_ISREG(inode->i_mode))
+			BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
+	}
+
+	btrfs_update_iflags(inode);
+}
+
 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
 				     struct btrfs_root *root,
 				     struct inode *dir,
@@ -7991,7 +8081,7 @@ static blk_status_t dio_read_error(struct inode *inode, struct bio *failed_bio,
 	struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
 	struct bio *bio;
 	int isector;
-	int read_mode = 0;
+	unsigned int read_mode = 0;
 	int segs;
 	int ret;
 	blk_status_t status;
@@ -8021,7 +8111,7 @@ static blk_status_t dio_read_error(struct inode *inode, struct bio *failed_bio,
 	bio_set_op_attrs(bio, REQ_OP_READ, read_mode);
 
 	btrfs_debug(BTRFS_I(inode)->root->fs_info,
-		    "Repair DIO Read Error: submitting new dio read[%#x] to this_mirror=%d, in_validation=%d\n",
+		    "repair DIO read error: submitting new dio read[%#x] to this_mirror=%d, in_validation=%d",
 		    read_mode, failrec->this_mirror, failrec->in_validation);
 
 	status = submit_dio_repair_bio(inode, bio, failrec->this_mirror);
@@ -8106,7 +8196,7 @@ next_block_or_try_again:
 			goto next;
 		}
 
-		wait_for_completion(&done.done);
+		wait_for_completion_io(&done.done);
 
 		if (!done.uptodate) {
 			/* We might have another mirror, so try again */
@@ -8221,7 +8311,7 @@ try_again:
 			goto next;
 		}
 
-		wait_for_completion(&done.done);
+		wait_for_completion_io(&done.done);
 
 		if (!done.uptodate) {
 			/* We might have another mirror, so try again */
@@ -8428,7 +8518,7 @@ static inline blk_status_t btrfs_lookup_and_bind_dio_csum(struct inode *inode,
 
 static inline blk_status_t
 __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode, u64 file_offset,
-		       int skip_sum, int async_submit)
+		       int async_submit)
 {
 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
 	struct btrfs_dio_private *dip = bio->bi_private;
@@ -8446,7 +8536,7 @@ __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode, u64 file_offset,
 			goto err;
 	}
 
-	if (skip_sum)
+	if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)
 		goto map;
 
 	if (write && async_submit) {
@@ -8476,8 +8566,7 @@ err:
 	return ret;
 }
 
-static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip,
-				    int skip_sum)
+static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip)
 {
 	struct inode *inode = dip->inode;
 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
@@ -8541,7 +8630,7 @@ static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip,
 		 */
 		atomic_inc(&dip->pending_bios);
 
-		status = __btrfs_submit_dio_bio(bio, inode, file_offset, skip_sum,
+		status = __btrfs_submit_dio_bio(bio, inode, file_offset,
 						async_submit);
 		if (status) {
 			bio_put(bio);
@@ -8561,8 +8650,7 @@ static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip,
 	} while (submit_len > 0);
 
 submit:
-	status = __btrfs_submit_dio_bio(bio, inode, file_offset, skip_sum,
-					async_submit);
+	status = __btrfs_submit_dio_bio(bio, inode, file_offset, async_submit);
 	if (!status)
 		return 0;
 
@@ -8587,12 +8675,9 @@ static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode,
 	struct btrfs_dio_private *dip = NULL;
 	struct bio *bio = NULL;
 	struct btrfs_io_bio *io_bio;
-	int skip_sum;
 	bool write = (bio_op(dio_bio) == REQ_OP_WRITE);
 	int ret = 0;
 
-	skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
-
 	bio = btrfs_bio_clone(dio_bio);
 
 	dip = kzalloc(sizeof(*dip), GFP_NOFS);
@@ -8635,7 +8720,7 @@ static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode,
 			dio_data->unsubmitted_oe_range_end;
 	}
 
-	ret = btrfs_submit_direct_hook(dip, skip_sum);
+	ret = btrfs_submit_direct_hook(dip);
 	if (!ret)
 		return;
 
@@ -8735,7 +8820,6 @@ static ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 		return 0;
 
 	inode_dio_begin(inode);
-	smp_mb__after_atomic();
 
 	/*
 	 * The generic stuff only does filemap_write_and_wait_range, which
@@ -9408,7 +9492,8 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
 	ei->reserved_extents = 0;
 
 	ei->runtime_flags = 0;
-	ei->force_compress = BTRFS_COMPRESS_NONE;
+	ei->prop_compress = BTRFS_COMPRESS_NONE;
+	ei->defrag_compress = BTRFS_COMPRESS_NONE;
 
 	ei->delayed_node = NULL;
 
@@ -10748,6 +10833,7 @@ static const struct file_operations btrfs_dir_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
 	.iterate_shared	= btrfs_real_readdir,
+	.open		= btrfs_opendir,
 	.unlocked_ioctl	= btrfs_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= btrfs_compat_ioctl,
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index fa1b78cf25f6..ae8fbf9d3de2 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -156,37 +156,6 @@ void btrfs_update_iflags(struct inode *inode)
 		      new_fl);
 }
 
-/*
- * Inherit flags from the parent inode.
- *
- * Currently only the compression flags and the cow flags are inherited.
- */
-void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
-{
-	unsigned int flags;
-
-	if (!dir)
-		return;
-
-	flags = BTRFS_I(dir)->flags;
-
-	if (flags & BTRFS_INODE_NOCOMPRESS) {
-		BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
-		BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
-	} else if (flags & BTRFS_INODE_COMPRESS) {
-		BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
-		BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
-	}
-
-	if (flags & BTRFS_INODE_NODATACOW) {
-		BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
-		if (S_ISREG(inode->i_mode))
-			BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
-	}
-
-	btrfs_update_iflags(inode);
-}
-
 static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
 {
 	struct btrfs_inode *ip = BTRFS_I(file_inode(file));
@@ -638,7 +607,7 @@ fail_free:
 	return ret;
 }
 
-static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root *root)
+static void btrfs_wait_for_no_snapshotting_writes(struct btrfs_root *root)
 {
 	s64 writers;
 	DEFINE_WAIT(wait);
@@ -681,9 +650,9 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir,
 		goto free_pending;
 	}
 
-	atomic_inc(&root->will_be_snapshoted);
+	atomic_inc(&root->will_be_snapshotted);
 	smp_mb__after_atomic();
-	btrfs_wait_for_no_snapshoting_writes(root);
+	btrfs_wait_for_no_snapshotting_writes(root);
 
 	ret = btrfs_start_delalloc_inodes(root, 0);
 	if (ret)
@@ -754,8 +723,8 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir,
 fail:
 	btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv);
 dec_and_free:
-	if (atomic_dec_and_test(&root->will_be_snapshoted))
-		wake_up_atomic_t(&root->will_be_snapshoted);
+	if (atomic_dec_and_test(&root->will_be_snapshotted))
+		wake_up_atomic_t(&root->will_be_snapshotted);
 free_pending:
 	kfree(pending_snapshot->root_item);
 	btrfs_free_path(pending_snapshot->path);
@@ -1286,6 +1255,7 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
 	unsigned long cluster = max_cluster;
 	u64 new_align = ~((u64)SZ_128K - 1);
 	struct page **pages = NULL;
+	bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS;
 
 	if (isize == 0)
 		return 0;
@@ -1293,7 +1263,7 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
 	if (range->start >= isize)
 		return -EINVAL;
 
-	if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
+	if (do_compress) {
 		if (range->compress_type > BTRFS_COMPRESS_TYPES)
 			return -EINVAL;
 		if (range->compress_type)
@@ -1304,20 +1274,19 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
 		extent_thresh = SZ_256K;
 
 	/*
-	 * if we were not given a file, allocate a readahead
-	 * context
+	 * If we were not given a file, allocate a readahead context. As
+	 * readahead is just an optimization, defrag will work without it so
+	 * we don't error out.
 	 */
 	if (!file) {
-		ra = kzalloc(sizeof(*ra), GFP_NOFS);
-		if (!ra)
-			return -ENOMEM;
-		file_ra_state_init(ra, inode->i_mapping);
+		ra = kzalloc(sizeof(*ra), GFP_KERNEL);
+		if (ra)
+			file_ra_state_init(ra, inode->i_mapping);
 	} else {
 		ra = &file->f_ra;
 	}
 
-	pages = kmalloc_array(max_cluster, sizeof(struct page *),
-			GFP_NOFS);
+	pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL);
 	if (!pages) {
 		ret = -ENOMEM;
 		goto out_ra;
@@ -1373,8 +1342,7 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
 
 		if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT,
 					 extent_thresh, &last_len, &skip,
-					 &defrag_end, range->flags &
-					 BTRFS_DEFRAG_RANGE_COMPRESS)) {
+					 &defrag_end, do_compress)){
 			unsigned long next;
 			/*
 			 * the should_defrag function tells us how much to skip
@@ -1395,14 +1363,15 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
 
 		if (i + cluster > ra_index) {
 			ra_index = max(i, ra_index);
-			btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
-				       cluster);
+			if (ra)
+				page_cache_sync_readahead(inode->i_mapping, ra,
+						file, ra_index, cluster);
 			ra_index += cluster;
 		}
 
 		inode_lock(inode);
-		if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
-			BTRFS_I(inode)->force_compress = compress_type;
+		if (do_compress)
+			BTRFS_I(inode)->defrag_compress = compress_type;
 		ret = cluster_pages_for_defrag(inode, pages, i, cluster);
 		if (ret < 0) {
 			inode_unlock(inode);
@@ -1449,7 +1418,7 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
 			filemap_flush(inode->i_mapping);
 	}
 
-	if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
+	if (do_compress) {
 		/* the filemap_flush will queue IO into the worker threads, but
 		 * we have to make sure the IO is actually started and that
 		 * ordered extents get created before we return
@@ -1471,9 +1440,9 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
 	ret = defrag_count;
 
 out_ra:
-	if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
+	if (do_compress) {
 		inode_lock(inode);
-		BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
+		BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE;
 		inode_unlock(inode);
 	}
 	if (!file)
@@ -1600,8 +1569,7 @@ static noinline int btrfs_ioctl_resize(struct file *file,
 		goto out_free;
 	}
 
-	new_size = div_u64(new_size, fs_info->sectorsize);
-	new_size *= fs_info->sectorsize;
+	new_size = round_down(new_size, fs_info->sectorsize);
 
 	btrfs_info_in_rcu(fs_info, "new size for %s is %llu",
 			  rcu_str_deref(device->name), new_size);
@@ -2201,9 +2169,6 @@ static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
 
 	buf_size = args.buf_size;
 
-	if (buf_size < sizeof(struct btrfs_ioctl_search_header))
-		return -EOVERFLOW;
-
 	/* limit result size to 16MB */
 	if (buf_size > buf_limit)
 		buf_size = buf_limit;
@@ -3998,15 +3963,35 @@ static long btrfs_ioctl_trans_start(struct file *file)
 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
 	struct btrfs_root *root = BTRFS_I(inode)->root;
 	struct btrfs_trans_handle *trans;
+	struct btrfs_file_private *private;
 	int ret;
+	static bool warned = false;
 
 	ret = -EPERM;
 	if (!capable(CAP_SYS_ADMIN))
 		goto out;
 
+	if (!warned) {
+		btrfs_warn(fs_info,
+			"Userspace transaction mechanism is considered "
+			"deprecated and slated to be removed in 4.17. "
+			"If you have a valid use case please "
+			"speak up on the mailing list");
+		WARN_ON(1);
+		warned = true;
+	}
+
 	ret = -EINPROGRESS;
-	if (file->private_data)
+	private = file->private_data;
+	if (private && private->trans)
 		goto out;
+	if (!private) {
+		private = kzalloc(sizeof(struct btrfs_file_private),
+				  GFP_KERNEL);
+		if (!private)
+			return -ENOMEM;
+		file->private_data = private;
+	}
 
 	ret = -EROFS;
 	if (btrfs_root_readonly(root))
@@ -4023,7 +4008,7 @@ static long btrfs_ioctl_trans_start(struct file *file)
 	if (IS_ERR(trans))
 		goto out_drop;
 
-	file->private_data = trans;
+	private->trans = trans;
 	return 0;
 
 out_drop:
@@ -4278,14 +4263,13 @@ long btrfs_ioctl_trans_end(struct file *file)
 {
 	struct inode *inode = file_inode(file);
 	struct btrfs_root *root = BTRFS_I(inode)->root;
-	struct btrfs_trans_handle *trans;
+	struct btrfs_file_private *private = file->private_data;
 
-	trans = file->private_data;
-	if (!trans)
+	if (!private || !private->trans)
 		return -EINVAL;
-	file->private_data = NULL;
 
-	btrfs_end_transaction(trans);
+	btrfs_end_transaction(private->trans);
+	private->trans = NULL;
 
 	atomic_dec(&root->fs_info->open_ioctl_trans);
 
diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index fcae61e175f3..569205e651c7 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -44,7 +44,7 @@ static void print_dev_item(struct extent_buffer *eb,
 static void print_extent_data_ref(struct extent_buffer *eb,
 				  struct btrfs_extent_data_ref *ref)
 {
-	pr_info("\t\textent data backref root %llu objectid %llu offset %llu count %u\n",
+	pr_cont("extent data backref root %llu objectid %llu offset %llu count %u\n",
 	       btrfs_extent_data_ref_root(eb, ref),
 	       btrfs_extent_data_ref_objectid(eb, ref),
 	       btrfs_extent_data_ref_offset(eb, ref),
@@ -63,6 +63,7 @@ static void print_extent_item(struct extent_buffer *eb, int slot, int type)
 	u32 item_size = btrfs_item_size_nr(eb, slot);
 	u64 flags;
 	u64 offset;
+	int ref_index = 0;
 
 	if (item_size < sizeof(*ei)) {
 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
@@ -104,12 +105,20 @@ static void print_extent_item(struct extent_buffer *eb, int slot, int type)
 		iref = (struct btrfs_extent_inline_ref *)ptr;
 		type = btrfs_extent_inline_ref_type(eb, iref);
 		offset = btrfs_extent_inline_ref_offset(eb, iref);
+		pr_info("\t\tref#%d: ", ref_index++);
 		switch (type) {
 		case BTRFS_TREE_BLOCK_REF_KEY:
-			pr_info("\t\ttree block backref root %llu\n", offset);
+			pr_cont("tree block backref root %llu\n", offset);
 			break;
 		case BTRFS_SHARED_BLOCK_REF_KEY:
-			pr_info("\t\tshared block backref parent %llu\n", offset);
+			pr_cont("shared block backref parent %llu\n", offset);
+			/*
+			 * offset is supposed to be a tree block which
+			 * must be aligned to nodesize.
+			 */
+			if (!IS_ALIGNED(offset, eb->fs_info->nodesize))
+				pr_info("\t\t\t(parent %llu is NOT ALIGNED to nodesize %llu)\n",
+					offset, (unsigned long long)eb->fs_info->nodesize);
 			break;
 		case BTRFS_EXTENT_DATA_REF_KEY:
 			dref = (struct btrfs_extent_data_ref *)(&iref->offset);
@@ -117,11 +126,20 @@ static void print_extent_item(struct extent_buffer *eb, int slot, int type)
 			break;
 		case BTRFS_SHARED_DATA_REF_KEY:
 			sref = (struct btrfs_shared_data_ref *)(iref + 1);
-			pr_info("\t\tshared data backref parent %llu count %u\n",
+			pr_cont("shared data backref parent %llu count %u\n",
 			       offset, btrfs_shared_data_ref_count(eb, sref));
+			/*
+			 * offset is supposed to be a tree block which
+			 * must be aligned to nodesize.
+			 */
+			if (!IS_ALIGNED(offset, eb->fs_info->nodesize))
+				pr_info("\t\t\t(parent %llu is NOT ALIGNED to nodesize %llu)\n",
+				     offset, (unsigned long long)eb->fs_info->nodesize);
 			break;
 		default:
-			BUG();
+			pr_cont("(extent %llu has INVALID ref type %d)\n",
+				  eb->start, type);
+			return;
 		}
 		ptr += btrfs_extent_inline_ref_size(type);
 	}
@@ -161,8 +179,9 @@ static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
 	}
 }
 
-void btrfs_print_leaf(struct btrfs_fs_info *fs_info, struct extent_buffer *l)
+void btrfs_print_leaf(struct extent_buffer *l)
 {
+	struct btrfs_fs_info *fs_info;
 	int i;
 	u32 type, nr;
 	struct btrfs_item *item;
@@ -180,6 +199,7 @@ void btrfs_print_leaf(struct btrfs_fs_info *fs_info, struct extent_buffer *l)
 	if (!l)
 		return;
 
+	fs_info = l->fs_info;
 	nr = btrfs_header_nritems(l);
 
 	btrfs_info(fs_info, "leaf %llu total ptrs %d free space %d",
@@ -318,18 +338,20 @@ void btrfs_print_leaf(struct btrfs_fs_info *fs_info, struct extent_buffer *l)
 	}
 }
 
-void btrfs_print_tree(struct btrfs_fs_info *fs_info, struct extent_buffer *c)
+void btrfs_print_tree(struct extent_buffer *c)
 {
+	struct btrfs_fs_info *fs_info;
 	int i; u32 nr;
 	struct btrfs_key key;
 	int level;
 
 	if (!c)
 		return;
+	fs_info = c->fs_info;
 	nr = btrfs_header_nritems(c);
 	level = btrfs_header_level(c);
 	if (level == 0) {
-		btrfs_print_leaf(fs_info, c);
+		btrfs_print_leaf(c);
 		return;
 	}
 	btrfs_info(fs_info,
@@ -359,7 +381,7 @@ void btrfs_print_tree(struct btrfs_fs_info *fs_info, struct extent_buffer *c)
 		if (btrfs_header_level(next) !=
 		       level - 1)
 			BUG();
-		btrfs_print_tree(fs_info, next);
+		btrfs_print_tree(next);
 		free_extent_buffer(next);
 	}
 }
diff --git a/fs/btrfs/print-tree.h b/fs/btrfs/print-tree.h
index 4f2e0ea0e95a..3afd508ed8c5 100644
--- a/fs/btrfs/print-tree.h
+++ b/fs/btrfs/print-tree.h
@@ -18,6 +18,6 @@
 
 #ifndef __PRINT_TREE_
 #define __PRINT_TREE_
-void btrfs_print_leaf(struct btrfs_fs_info *fs_info, struct extent_buffer *l);
-void btrfs_print_tree(struct btrfs_fs_info *fs_info, struct extent_buffer *c);
+void btrfs_print_leaf(struct extent_buffer *l);
+void btrfs_print_tree(struct extent_buffer *c);
 #endif
diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c
index 4b23ae5d0e5c..09c0266f248d 100644
--- a/fs/btrfs/props.c
+++ b/fs/btrfs/props.c
@@ -403,28 +403,28 @@ static int prop_compression_apply(struct inode *inode,
 	if (len == 0) {
 		BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
 		BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
-		BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
+		BTRFS_I(inode)->prop_compress = BTRFS_COMPRESS_NONE;
 
 		return 0;
 	}
 
-	if (!strncmp("lzo", value, len))
+	if (!strncmp("lzo", value, 3))
 		type = BTRFS_COMPRESS_LZO;
-	else if (!strncmp("zlib", value, len))
+	else if (!strncmp("zlib", value, 4))
 		type = BTRFS_COMPRESS_ZLIB;
 	else
 		return -EINVAL;
 
 	BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
 	BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
-	BTRFS_I(inode)->force_compress = type;
+	BTRFS_I(inode)->prop_compress = type;
 
 	return 0;
 }
 
 static const char *prop_compression_extract(struct inode *inode)
 {
-	switch (BTRFS_I(inode)->force_compress) {
+	switch (BTRFS_I(inode)->prop_compress) {
 	case BTRFS_COMPRESS_ZLIB:
 		return "zlib";
 	case BTRFS_COMPRESS_LZO:
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 4ce351efe281..5c8b61c86e61 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -946,7 +946,6 @@ out:
 int btrfs_quota_disable(struct btrfs_trans_handle *trans,
 			struct btrfs_fs_info *fs_info)
 {
-	struct btrfs_root *tree_root = fs_info->tree_root;
 	struct btrfs_root *quota_root;
 	int ret = 0;
 
@@ -968,7 +967,7 @@ int btrfs_quota_disable(struct btrfs_trans_handle *trans,
 	if (ret)
 		goto out;
 
-	ret = btrfs_del_root(trans, tree_root, &quota_root->root_key);
+	ret = btrfs_del_root(trans, fs_info, &quota_root->root_key);
 	if (ret)
 		goto out;
 
@@ -1603,7 +1602,7 @@ int btrfs_qgroup_trace_subtree(struct btrfs_trans_handle *trans,
 	struct extent_buffer *eb = root_eb;
 	struct btrfs_path *path = NULL;
 
-	BUG_ON(root_level < 0 || root_level > BTRFS_MAX_LEVEL);
+	BUG_ON(root_level < 0 || root_level >= BTRFS_MAX_LEVEL);
 	BUG_ON(root_eb == NULL);
 
 	if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
@@ -2646,7 +2645,7 @@ out:
 	if (IS_ERR(trans)) {
 		err = PTR_ERR(trans);
 		btrfs_err(fs_info,
-			  "fail to start transaction for status update: %d\n",
+			  "fail to start transaction for status update: %d",
 			  err);
 		goto done;
 	}
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 65661d1aae4e..3a49a3c2fca4 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -32,6 +32,7 @@
 #include "free-space-cache.h"
 #include "inode-map.h"
 #include "qgroup.h"
+#include "print-tree.h"
 
 /*
  * backref_node, mapping_node and tree_block start with this
@@ -799,9 +800,17 @@ again:
 		if (ptr < end) {
 			/* update key for inline back ref */
 			struct btrfs_extent_inline_ref *iref;
+			int type;
 			iref = (struct btrfs_extent_inline_ref *)ptr;
-			key.type = btrfs_extent_inline_ref_type(eb, iref);
+			type = btrfs_get_extent_inline_ref_type(eb, iref,
+							BTRFS_REF_TYPE_BLOCK);
+			if (type == BTRFS_REF_TYPE_INVALID) {
+				err = -EINVAL;
+				goto out;
+			}
+			key.type = type;
 			key.offset = btrfs_extent_inline_ref_offset(eb, iref);
+
 			WARN_ON(key.type != BTRFS_TREE_BLOCK_REF_KEY &&
 				key.type != BTRFS_SHARED_BLOCK_REF_KEY);
 		}
@@ -1308,8 +1317,6 @@ static int __must_check __add_reloc_root(struct btrfs_root *root)
 		btrfs_panic(fs_info, -EEXIST,
 			    "Duplicate root found for start=%llu while inserting into relocation tree",
 			    node->bytenr);
-		kfree(node);
-		return -EEXIST;
 	}
 
 	list_add_tail(&root->root_list, &rc->reloc_roots);
@@ -3477,7 +3484,16 @@ again:
 			goto again;
 		}
 	}
-	BUG_ON(ret);
+	if (ret) {
+		ASSERT(ret == 1);
+		btrfs_print_leaf(path->nodes[0]);
+		btrfs_err(fs_info,
+	     "tree block extent item (%llu) is not found in extent tree",
+		     bytenr);
+		WARN_ON(1);
+		ret = -EINVAL;
+		goto out;
+	}
 
 	ret = add_tree_block(rc, &key, path, blocks);
 out:
@@ -3755,7 +3771,8 @@ int add_data_references(struct reloc_control *rc,
 
 	while (ptr < end) {
 		iref = (struct btrfs_extent_inline_ref *)ptr;
-		key.type = btrfs_extent_inline_ref_type(eb, iref);
+		key.type = btrfs_get_extent_inline_ref_type(eb, iref,
+							BTRFS_REF_TYPE_DATA);
 		if (key.type == BTRFS_SHARED_DATA_REF_KEY) {
 			key.offset = btrfs_extent_inline_ref_offset(eb, iref);
 			ret = __add_tree_block(rc, key.offset, blocksize,
@@ -3765,7 +3782,10 @@ int add_data_references(struct reloc_control *rc,
 			ret = find_data_references(rc, extent_key,
 						   eb, dref, blocks);
 		} else {
-			BUG();
+			ret = -EINVAL;
+			btrfs_err(rc->extent_root->fs_info,
+		     "extent %llu slot %d has an invalid inline ref type",
+			     eb->start, path->slots[0]);
 		}
 		if (ret) {
 			err = ret;
diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index 460db0cb2d07..9fb9896610e0 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -151,7 +151,7 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
 	}
 
 	if (ret != 0) {
-		btrfs_print_leaf(fs_info, path->nodes[0]);
+		btrfs_print_leaf(path->nodes[0]);
 		btrfs_crit(fs_info, "unable to update root key %llu %u %llu",
 			   key->objectid, key->type, key->offset);
 		BUG_ON(1);
@@ -335,10 +335,11 @@ int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info)
 	return err;
 }
 
-/* drop the root item for 'key' from 'root' */
-int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
-		   const struct btrfs_key *key)
+/* drop the root item for 'key' from the tree root */
+int btrfs_del_root(struct btrfs_trans_handle *trans,
+		   struct btrfs_fs_info *fs_info, const struct btrfs_key *key)
 {
+	struct btrfs_root *root = fs_info->tree_root;
 	struct btrfs_path *path;
 	int ret;
 
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index b0b71e8e4c36..e3f6c49e5c4d 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -182,8 +182,8 @@ struct scrub_ctx {
 	struct scrub_bio        *wr_curr_bio;
 	struct mutex            wr_lock;
 	int                     pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */
-	atomic_t                flush_all_writes;
 	struct btrfs_device     *wr_tgtdev;
+	bool                    flush_all_writes;
 
 	/*
 	 * statistics
@@ -717,7 +717,7 @@ struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace)
 		WARN_ON(!fs_info->dev_replace.tgtdev);
 		sctx->pages_per_wr_bio = SCRUB_PAGES_PER_WR_BIO;
 		sctx->wr_tgtdev = fs_info->dev_replace.tgtdev;
-		atomic_set(&sctx->flush_all_writes, 0);
+		sctx->flush_all_writes = false;
 	}
 
 	return sctx;
@@ -1704,7 +1704,7 @@ static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info,
 	if (ret)
 		return ret;
 
-	wait_for_completion(&done.event);
+	wait_for_completion_io(&done.event);
 	if (done.status)
 		return -EIO;
 
@@ -1769,7 +1769,7 @@ static inline int scrub_check_fsid(u8 fsid[],
 	struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices;
 	int ret;
 
-	ret = memcmp(fsid, fs_devices->fsid, BTRFS_UUID_SIZE);
+	ret = memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE);
 	return !ret;
 }
 
@@ -2402,8 +2402,7 @@ static void scrub_missing_raid56_worker(struct btrfs_work *work)
 
 	scrub_block_put(sblock);
 
-	if (sctx->is_dev_replace &&
-	    atomic_read(&sctx->flush_all_writes)) {
+	if (sctx->is_dev_replace && sctx->flush_all_writes) {
 		mutex_lock(&sctx->wr_lock);
 		scrub_wr_submit(sctx);
 		mutex_unlock(&sctx->wr_lock);
@@ -2607,8 +2606,7 @@ static void scrub_bio_end_io_worker(struct btrfs_work *work)
 	sctx->first_free = sbio->index;
 	spin_unlock(&sctx->list_lock);
 
-	if (sctx->is_dev_replace &&
-	    atomic_read(&sctx->flush_all_writes)) {
+	if (sctx->is_dev_replace && sctx->flush_all_writes) {
 		mutex_lock(&sctx->wr_lock);
 		scrub_wr_submit(sctx);
 		mutex_unlock(&sctx->wr_lock);
@@ -2622,7 +2620,8 @@ static inline void __scrub_mark_bitmap(struct scrub_parity *sparity,
 				       u64 start, u64 len)
 {
 	u64 offset;
-	int nsectors;
+	u64 nsectors64;
+	u32 nsectors;
 	int sectorsize = sparity->sctx->fs_info->sectorsize;
 
 	if (len >= sparity->stripe_len) {
@@ -2633,7 +2632,10 @@ static inline void __scrub_mark_bitmap(struct scrub_parity *sparity,
 	start -= sparity->logic_start;
 	start = div64_u64_rem(start, sparity->stripe_len, &offset);
 	offset = div_u64(offset, sectorsize);
-	nsectors = (int)len / sectorsize;
+	nsectors64 = div_u64(len, sectorsize);
+
+	ASSERT(nsectors64 < UINT_MAX);
+	nsectors = (u32)nsectors64;
 
 	if (offset + nsectors <= sparity->nsectors) {
 		bitmap_set(bitmap, offset, nsectors);
@@ -2706,7 +2708,9 @@ static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u8 *csum)
 	if (!sum)
 		return 0;
 
-	index = ((u32)(logical - sum->bytenr)) / sctx->fs_info->sectorsize;
+	index = div_u64(logical - sum->bytenr, sctx->fs_info->sectorsize);
+	ASSERT(index < UINT_MAX);
+
 	num_sectors = sum->len / sctx->fs_info->sectorsize;
 	memcpy(csum, sum->sums + index, sctx->csum_size);
 	if (index == num_sectors - 1) {
@@ -3440,14 +3444,14 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
 		 */
 		if (atomic_read(&fs_info->scrub_pause_req)) {
 			/* push queued extents */
-			atomic_set(&sctx->flush_all_writes, 1);
+			sctx->flush_all_writes = true;
 			scrub_submit(sctx);
 			mutex_lock(&sctx->wr_lock);
 			scrub_wr_submit(sctx);
 			mutex_unlock(&sctx->wr_lock);
 			wait_event(sctx->list_wait,
 				   atomic_read(&sctx->bios_in_flight) == 0);
-			atomic_set(&sctx->flush_all_writes, 0);
+			sctx->flush_all_writes = false;
 			scrub_blocked_if_needed(fs_info);
 		}
 
@@ -3869,8 +3873,7 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx,
 			ro_set = 0;
 		} else {
 			btrfs_warn(fs_info,
-				   "failed setting block group ro, ret=%d\n",
-				   ret);
+				   "failed setting block group ro: %d", ret);
 			btrfs_put_block_group(cache);
 			break;
 		}
@@ -3893,7 +3896,7 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx,
 		 * write requests are really completed when bios_in_flight
 		 * changes to 0.
 		 */
-		atomic_set(&sctx->flush_all_writes, 1);
+		sctx->flush_all_writes = true;
 		scrub_submit(sctx);
 		mutex_lock(&sctx->wr_lock);
 		scrub_wr_submit(sctx);
@@ -3911,7 +3914,7 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx,
 		 */
 		wait_event(sctx->list_wait,
 			   atomic_read(&sctx->workers_pending) == 0);
-		atomic_set(&sctx->flush_all_writes, 0);
+		sctx->flush_all_writes = false;
 
 		scrub_pause_off(fs_info);
 
@@ -4012,14 +4015,8 @@ static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
 	int max_active = fs_info->thread_pool_size;
 
 	if (fs_info->scrub_workers_refcnt == 0) {
-		if (is_dev_replace)
-			fs_info->scrub_workers =
-				btrfs_alloc_workqueue(fs_info, "scrub", flags,
-						      1, 4);
-		else
-			fs_info->scrub_workers =
-				btrfs_alloc_workqueue(fs_info, "scrub", flags,
-						      max_active, 4);
+		fs_info->scrub_workers = btrfs_alloc_workqueue(fs_info, "scrub",
+				flags, is_dev_replace ? 1 : max_active, 4);
 		if (!fs_info->scrub_workers)
 			goto fail_scrub_workers;
 
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index b082210df9c8..8f1d3d6e7087 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -4733,7 +4733,7 @@ static ssize_t fill_read_buf(struct send_ctx *sctx, u64 offset, u32 len)
 	/* initial readahead */
 	memset(&sctx->ra, 0, sizeof(struct file_ra_state));
 	file_ra_state_init(&sctx->ra, inode->i_mapping);
-	btrfs_force_ra(inode->i_mapping, &sctx->ra, NULL, index,
+	page_cache_sync_readahead(inode->i_mapping, &sctx->ra, NULL, index,
 		       last_index - index + 1);
 
 	while (index <= last_index) {
@@ -4992,6 +4992,25 @@ static int clone_range(struct send_ctx *sctx,
 	struct btrfs_key key;
 	int ret;
 
+	/*
+	 * Prevent cloning from a zero offset with a length matching the sector
+	 * size because in some scenarios this will make the receiver fail.
+	 *
+	 * For example, if in the source filesystem the extent at offset 0
+	 * has a length of sectorsize and it was written using direct IO, then
+	 * it can never be an inline extent (even if compression is enabled).
+	 * Then this extent can be cloned in the original filesystem to a non
+	 * zero file offset, but it may not be possible to clone in the
+	 * destination filesystem because it can be inlined due to compression
+	 * on the destination filesystem (as the receiver's write operations are
+	 * always done using buffered IO). The same happens when the original
+	 * filesystem does not have compression enabled but the destination
+	 * filesystem has.
+	 */
+	if (clone_root->offset == 0 &&
+	    len == sctx->send_root->fs_info->sectorsize)
+		return send_extent_data(sctx, offset, len);
+
 	path = alloc_path_for_send();
 	if (!path)
 		return -ENOMEM;
diff --git a/fs/btrfs/struct-funcs.c b/fs/btrfs/struct-funcs.c
index 875c757e73e2..5e2b92d83617 100644
--- a/fs/btrfs/struct-funcs.c
+++ b/fs/btrfs/struct-funcs.c
@@ -50,8 +50,8 @@ static inline void put_unaligned_le8(u8 val, void *p)
  */
 
 #define DEFINE_BTRFS_SETGET_BITS(bits)					\
-u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr,	\
-			       unsigned long off,			\
+u##bits btrfs_get_token_##bits(const struct extent_buffer *eb,		\
+			       const void *ptr, unsigned long off,	\
 			       struct btrfs_map_token *token)		\
 {									\
 	unsigned long part_offset = (unsigned long)ptr;			\
@@ -90,7 +90,8 @@ u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr,	\
 	return res;							\
 }									\
 void btrfs_set_token_##bits(struct extent_buffer *eb,			\
-			    void *ptr, unsigned long off, u##bits val,	\
+			    const void *ptr, unsigned long off,		\
+			    u##bits val,				\
 			    struct btrfs_map_token *token)		\
 {									\
 	unsigned long part_offset = (unsigned long)ptr;			\
@@ -133,7 +134,7 @@ DEFINE_BTRFS_SETGET_BITS(16)
 DEFINE_BTRFS_SETGET_BITS(32)
 DEFINE_BTRFS_SETGET_BITS(64)
 
-void btrfs_node_key(struct extent_buffer *eb,
+void btrfs_node_key(const struct extent_buffer *eb,
 		    struct btrfs_disk_key *disk_key, int nr)
 {
 	unsigned long ptr = btrfs_node_key_ptr_offset(nr);
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 12540b6104b5..0b7a1d8cd08b 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -61,6 +61,7 @@
 #include "tests/btrfs-tests.h"
 
 #include "qgroup.h"
+#include "backref.h"
 #define CREATE_TRACE_POINTS
 #include <trace/events/btrfs.h>
 
@@ -425,7 +426,7 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
 	 * strsep changes the string, duplicate it because parse_options
 	 * gets called twice
 	 */
-	options = kstrdup(options, GFP_NOFS);
+	options = kstrdup(options, GFP_KERNEL);
 	if (!options)
 		return -ENOMEM;
 
@@ -498,14 +499,14 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
 				btrfs_test_opt(info, FORCE_COMPRESS);
 			if (token == Opt_compress ||
 			    token == Opt_compress_force ||
-			    strcmp(args[0].from, "zlib") == 0) {
+			    strncmp(args[0].from, "zlib", 4) == 0) {
 				compress_type = "zlib";
 				info->compress_type = BTRFS_COMPRESS_ZLIB;
 				btrfs_set_opt(info->mount_opt, COMPRESS);
 				btrfs_clear_opt(info->mount_opt, NODATACOW);
 				btrfs_clear_opt(info->mount_opt, NODATASUM);
 				no_compress = 0;
-			} else if (strcmp(args[0].from, "lzo") == 0) {
+			} else if (strncmp(args[0].from, "lzo", 3) == 0) {
 				compress_type = "lzo";
 				info->compress_type = BTRFS_COMPRESS_LZO;
 				btrfs_set_opt(info->mount_opt, COMPRESS);
@@ -548,20 +549,22 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
 			break;
 		case Opt_ssd:
 			btrfs_set_and_info(info, SSD,
-					   "use ssd allocation scheme");
+					   "enabling ssd optimizations");
 			btrfs_clear_opt(info->mount_opt, NOSSD);
 			break;
 		case Opt_ssd_spread:
+			btrfs_set_and_info(info, SSD,
+					   "enabling ssd optimizations");
 			btrfs_set_and_info(info, SSD_SPREAD,
-					   "use spread ssd allocation scheme");
-			btrfs_set_opt(info->mount_opt, SSD);
+					   "using spread ssd allocation scheme");
 			btrfs_clear_opt(info->mount_opt, NOSSD);
 			break;
 		case Opt_nossd:
-			btrfs_set_and_info(info, NOSSD,
-					     "not using ssd allocation scheme");
-			btrfs_clear_opt(info->mount_opt, SSD);
-			btrfs_clear_opt(info->mount_opt, SSD_SPREAD);
+			btrfs_set_opt(info->mount_opt, NOSSD);
+			btrfs_clear_and_info(info, SSD,
+					     "not using ssd optimizations");
+			btrfs_clear_and_info(info, SSD_SPREAD,
+					     "not using spread ssd allocation scheme");
 			break;
 		case Opt_barrier:
 			btrfs_clear_and_info(info, NOBARRIER,
@@ -949,7 +952,7 @@ static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
 	}
 	path->leave_spinning = 1;
 
-	name = kmalloc(PATH_MAX, GFP_NOFS);
+	name = kmalloc(PATH_MAX, GFP_KERNEL);
 	if (!name) {
 		ret = -ENOMEM;
 		goto err;
@@ -1335,10 +1338,11 @@ static char *setup_root_args(char *args)
 	char *buf, *dst, *sep;
 
 	if (!args)
-		return kstrdup("subvolid=0", GFP_NOFS);
+		return kstrdup("subvolid=0", GFP_KERNEL);
 
 	/* The worst case is that we add ",subvolid=0" to the end. */
-	buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, GFP_NOFS);
+	buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1,
+			GFP_KERNEL);
 	if (!buf)
 		return NULL;
 
@@ -1567,7 +1571,7 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
 	 * it for searching for existing supers, so this lets us do that and
 	 * then open_ctree will properly initialize everything later.
 	 */
-	fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS);
+	fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL);
 	if (!fs_info) {
 		error = -ENOMEM;
 		goto error_sec_opts;
@@ -1575,8 +1579,8 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
 
 	fs_info->fs_devices = fs_devices;
 
-	fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS);
-	fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS);
+	fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL);
+	fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL);
 	security_init_mnt_opts(&fs_info->security_opts);
 	if (!fs_info->super_copy || !fs_info->super_for_commit) {
 		error = -ENOMEM;
@@ -1780,8 +1784,7 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
 			goto restore;
 		}
 
-		if (fs_info->fs_devices->missing_devices >
-		     fs_info->num_tolerated_disk_barrier_failures) {
+		if (!btrfs_check_rw_degradable(fs_info)) {
 			btrfs_warn(fs_info,
 				"too many missing devices, writeable remount is not allowed");
 			ret = -EACCES;
@@ -1814,6 +1817,8 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
 			goto restore;
 		}
 
+		btrfs_qgroup_rescan_resume(fs_info);
+
 		if (!fs_info->uuid_root) {
 			btrfs_info(fs_info, "creating UUID tree");
 			ret = btrfs_create_uuid_tree(fs_info);
diff --git a/fs/btrfs/tests/btrfs-tests.c b/fs/btrfs/tests/btrfs-tests.c
index b18ab8f327a5..d3f25376a0f8 100644
--- a/fs/btrfs/tests/btrfs-tests.c
+++ b/fs/btrfs/tests/btrfs-tests.c
@@ -211,7 +211,6 @@ btrfs_alloc_dummy_block_group(struct btrfs_fs_info *fs_info,
 	cache->key.objectid = 0;
 	cache->key.offset = length;
 	cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
-	cache->sectorsize = fs_info->sectorsize;
 	cache->full_stripe_len = fs_info->sectorsize;
 	cache->fs_info = fs_info;
 
diff --git a/fs/btrfs/tests/free-space-tree-tests.c b/fs/btrfs/tests/free-space-tree-tests.c
index b29954c01673..1458bb0ea124 100644
--- a/fs/btrfs/tests/free-space-tree-tests.c
+++ b/fs/btrfs/tests/free-space-tree-tests.c
@@ -81,7 +81,7 @@ static int __check_free_space_extents(struct btrfs_trans_handle *trans,
 					i++;
 				}
 				prev_bit = bit;
-				offset += cache->sectorsize;
+				offset += fs_info->sectorsize;
 			}
 		}
 		if (prev_bit == 1) {
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 3a11ae63676e..ad7f4bab640b 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1143,8 +1143,6 @@ again:
 				goto again;
 			}
 			kfree(victim_name);
-			if (ret)
-				return ret;
 next:
 			cur_offset += victim_name_len + sizeof(*extref);
 		}
@@ -3690,7 +3688,7 @@ static noinline int copy_items(struct btrfs_trans_handle *trans,
 
 		src_offset = btrfs_item_ptr_offset(src, start_slot + i);
 
-		if ((i == (nr - 1)))
+		if (i == nr - 1)
 			last_key = ins_keys[i];
 
 		if (ins_keys[i].type == BTRFS_INODE_ITEM_KEY) {
@@ -4450,7 +4448,10 @@ static int btrfs_log_trailing_hole(struct btrfs_trans_handle *trans,
 			len = btrfs_file_extent_inline_len(leaf,
 							   path->slots[0],
 							   extent);
-			ASSERT(len == i_size);
+			ASSERT(len == i_size ||
+			       (len == fs_info->sectorsize &&
+				btrfs_file_extent_compression(leaf, extent) !=
+				BTRFS_COMPRESS_NONE));
 			return 0;
 		}
 
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 002aa318da67..c188256a367c 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -152,7 +152,15 @@ struct list_head *btrfs_get_fs_uuids(void)
 	return &fs_uuids;
 }
 
-static struct btrfs_fs_devices *__alloc_fs_devices(void)
+/*
+ * alloc_fs_devices - allocate struct btrfs_fs_devices
+ * @fsid:	if not NULL, copy the uuid to fs_devices::fsid
+ *
+ * Return a pointer to a new struct btrfs_fs_devices on success, or ERR_PTR().
+ * The returned struct is not linked onto any lists and can be destroyed with
+ * kfree() right away.
+ */
+static struct btrfs_fs_devices *alloc_fs_devices(const u8 *fsid)
 {
 	struct btrfs_fs_devices *fs_devs;
 
@@ -166,31 +174,8 @@ static struct btrfs_fs_devices *__alloc_fs_devices(void)
 	INIT_LIST_HEAD(&fs_devs->resized_devices);
 	INIT_LIST_HEAD(&fs_devs->alloc_list);
 	INIT_LIST_HEAD(&fs_devs->list);
-
-	return fs_devs;
-}
-
-/**
- * alloc_fs_devices - allocate struct btrfs_fs_devices
- * @fsid:	a pointer to UUID for this FS.  If NULL a new UUID is
- *		generated.
- *
- * Return: a pointer to a new &struct btrfs_fs_devices on success;
- * ERR_PTR() on error.  Returned struct is not linked onto any lists and
- * can be destroyed with kfree() right away.
- */
-static struct btrfs_fs_devices *alloc_fs_devices(const u8 *fsid)
-{
-	struct btrfs_fs_devices *fs_devs;
-
-	fs_devs = __alloc_fs_devices();
-	if (IS_ERR(fs_devs))
-		return fs_devs;
-
 	if (fsid)
 		memcpy(fs_devs->fsid, fsid, BTRFS_FSID_SIZE);
-	else
-		generate_random_uuid(fs_devs->fsid);
 
 	return fs_devs;
 }
@@ -269,9 +254,17 @@ static struct btrfs_device *__alloc_device(void)
 	return dev;
 }
 
-static noinline struct btrfs_device *__find_device(struct list_head *head,
-						   u64 devid, u8 *uuid)
+/*
+ * Find a device specified by @devid or @uuid in the list of @fs_devices, or
+ * return NULL.
+ *
+ * If devid and uuid are both specified, the match must be exact, otherwise
+ * only devid is used.
+ */
+static struct btrfs_device *find_device(struct btrfs_fs_devices *fs_devices,
+		u64 devid, const u8 *uuid)
 {
+	struct list_head *head = &fs_devices->devices;
 	struct btrfs_device *dev;
 
 	list_for_each_entry(dev, head, dev_list) {
@@ -310,7 +303,7 @@ btrfs_get_bdev_and_sb(const char *device_path, fmode_t flags, void *holder,
 
 	if (flush)
 		filemap_write_and_wait((*bdev)->bd_inode->i_mapping);
-	ret = set_blocksize(*bdev, 4096);
+	ret = set_blocksize(*bdev, BTRFS_BDEV_BLOCKSIZE);
 	if (ret) {
 		blkdev_put(*bdev, flags);
 		goto error;
@@ -636,8 +629,8 @@ static noinline int device_list_add(const char *path,
 
 		device = NULL;
 	} else {
-		device = __find_device(&fs_devices->devices, devid,
-				       disk_super->dev_item.uuid);
+		device = find_device(fs_devices, devid,
+				disk_super->dev_item.uuid);
 	}
 
 	if (!device) {
@@ -1578,7 +1571,6 @@ out:
 
 static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
 				  struct btrfs_device *device,
-				  u64 chunk_tree, u64 chunk_objectid,
 				  u64 chunk_offset, u64 start, u64 num_bytes)
 {
 	int ret;
@@ -1606,12 +1598,12 @@ static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
 	leaf = path->nodes[0];
 	extent = btrfs_item_ptr(leaf, path->slots[0],
 				struct btrfs_dev_extent);
-	btrfs_set_dev_extent_chunk_tree(leaf, extent, chunk_tree);
-	btrfs_set_dev_extent_chunk_objectid(leaf, extent, chunk_objectid);
+	btrfs_set_dev_extent_chunk_tree(leaf, extent,
+					BTRFS_CHUNK_TREE_OBJECTID);
+	btrfs_set_dev_extent_chunk_objectid(leaf, extent,
+					    BTRFS_FIRST_CHUNK_TREE_OBJECTID);
 	btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset);
 
-	write_extent_buffer_chunk_tree_uuid(leaf, fs_info->chunk_tree_uuid);
-
 	btrfs_set_dev_extent_length(leaf, extent, num_bytes);
 	btrfs_mark_buffer_dirty(leaf);
 out:
@@ -1726,7 +1718,7 @@ static int btrfs_add_device(struct btrfs_trans_handle *trans,
 	ptr = btrfs_device_uuid(dev_item);
 	write_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
 	ptr = btrfs_device_fsid(dev_item);
-	write_extent_buffer(leaf, fs_info->fsid, ptr, BTRFS_UUID_SIZE);
+	write_extent_buffer(leaf, fs_info->fsid, ptr, BTRFS_FSID_SIZE);
 	btrfs_mark_buffer_dirty(leaf);
 
 	ret = 0;
@@ -1872,7 +1864,6 @@ int btrfs_rm_device(struct btrfs_fs_info *fs_info, const char *device_path,
 	struct btrfs_fs_devices *cur_devices;
 	u64 num_devices;
 	int ret = 0;
-	bool clear_super = false;
 
 	mutex_lock(&uuid_mutex);
 
@@ -1908,7 +1899,6 @@ int btrfs_rm_device(struct btrfs_fs_info *fs_info, const char *device_path,
 		list_del_init(&device->dev_alloc_list);
 		device->fs_devices->rw_devices--;
 		mutex_unlock(&fs_info->chunk_mutex);
-		clear_super = true;
 	}
 
 	mutex_unlock(&uuid_mutex);
@@ -1987,9 +1977,6 @@ int btrfs_rm_device(struct btrfs_fs_info *fs_info, const char *device_path,
 		free_fs_devices(cur_devices);
 	}
 
-	fs_info->num_tolerated_disk_barrier_failures =
-		btrfs_calc_num_tolerated_disk_barrier_failures(fs_info);
-
 out:
 	mutex_unlock(&uuid_mutex);
 	return ret;
@@ -2202,7 +2189,7 @@ static int btrfs_prepare_sprout(struct btrfs_fs_info *fs_info)
 	if (!fs_devices->seeding)
 		return -EINVAL;
 
-	seed_devices = __alloc_fs_devices();
+	seed_devices = alloc_fs_devices(NULL);
 	if (IS_ERR(seed_devices))
 		return PTR_ERR(seed_devices);
 
@@ -2261,7 +2248,7 @@ static int btrfs_finish_sprout(struct btrfs_trans_handle *trans,
 	struct btrfs_dev_item *dev_item;
 	struct btrfs_device *device;
 	struct btrfs_key key;
-	u8 fs_uuid[BTRFS_UUID_SIZE];
+	u8 fs_uuid[BTRFS_FSID_SIZE];
 	u8 dev_uuid[BTRFS_UUID_SIZE];
 	u64 devid;
 	int ret;
@@ -2304,7 +2291,7 @@ next_slot:
 		read_extent_buffer(leaf, dev_uuid, btrfs_device_uuid(dev_item),
 				   BTRFS_UUID_SIZE);
 		read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item),
-				   BTRFS_UUID_SIZE);
+				   BTRFS_FSID_SIZE);
 		device = btrfs_find_device(fs_info, devid, dev_uuid, fs_uuid);
 		BUG_ON(!device); /* Logic error */
 
@@ -2407,7 +2394,7 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
 	device->is_tgtdev_for_dev_replace = 0;
 	device->mode = FMODE_EXCL;
 	device->dev_stats_valid = 1;
-	set_blocksize(device->bdev, 4096);
+	set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE);
 
 	if (seeding_dev) {
 		sb->s_flags &= ~MS_RDONLY;
@@ -2487,8 +2474,6 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
 				   "sysfs: failed to create fsid for sprout");
 	}
 
-	fs_info->num_tolerated_disk_barrier_failures =
-		btrfs_calc_num_tolerated_disk_barrier_failures(fs_info);
 	ret = btrfs_commit_transaction(trans);
 
 	if (seeding_dev) {
@@ -2612,7 +2597,7 @@ int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
 	device->is_tgtdev_for_dev_replace = 1;
 	device->mode = FMODE_EXCL;
 	device->dev_stats_valid = 1;
-	set_blocksize(device->bdev, 4096);
+	set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE);
 	device->fs_devices = fs_info->fs_devices;
 	list_add(&device->dev_list, &fs_info->fs_devices->devices);
 	fs_info->fs_devices->num_devices++;
@@ -2728,8 +2713,7 @@ int btrfs_grow_device(struct btrfs_trans_handle *trans,
 }
 
 static int btrfs_free_chunk(struct btrfs_trans_handle *trans,
-			    struct btrfs_fs_info *fs_info, u64 chunk_objectid,
-			    u64 chunk_offset)
+			    struct btrfs_fs_info *fs_info, u64 chunk_offset)
 {
 	struct btrfs_root *root = fs_info->chunk_root;
 	int ret;
@@ -2740,7 +2724,7 @@ static int btrfs_free_chunk(struct btrfs_trans_handle *trans,
 	if (!path)
 		return -ENOMEM;
 
-	key.objectid = chunk_objectid;
+	key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
 	key.offset = chunk_offset;
 	key.type = BTRFS_CHUNK_ITEM_KEY;
 
@@ -2763,8 +2747,7 @@ out:
 	return ret;
 }
 
-static int btrfs_del_sys_chunk(struct btrfs_fs_info *fs_info,
-			       u64 chunk_objectid, u64 chunk_offset)
+static int btrfs_del_sys_chunk(struct btrfs_fs_info *fs_info, u64 chunk_offset)
 {
 	struct btrfs_super_block *super_copy = fs_info->super_copy;
 	struct btrfs_disk_key *disk_key;
@@ -2797,7 +2780,7 @@ static int btrfs_del_sys_chunk(struct btrfs_fs_info *fs_info,
 			ret = -EIO;
 			break;
 		}
-		if (key.objectid == chunk_objectid &&
+		if (key.objectid == BTRFS_FIRST_CHUNK_TREE_OBJECTID &&
 		    key.offset == chunk_offset) {
 			memmove(ptr, ptr + len, array_size - (cur + len));
 			array_size -= len;
@@ -2846,7 +2829,6 @@ int btrfs_remove_chunk(struct btrfs_trans_handle *trans,
 	struct extent_map *em;
 	struct map_lookup *map;
 	u64 dev_extent_len = 0;
-	u64 chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
 	int i, ret = 0;
 	struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
 
@@ -2902,7 +2884,7 @@ int btrfs_remove_chunk(struct btrfs_trans_handle *trans,
 	}
 	mutex_unlock(&fs_devices->device_list_mutex);
 
-	ret = btrfs_free_chunk(trans, fs_info, chunk_objectid, chunk_offset);
+	ret = btrfs_free_chunk(trans, fs_info, chunk_offset);
 	if (ret) {
 		btrfs_abort_transaction(trans, ret);
 		goto out;
@@ -2911,8 +2893,7 @@ int btrfs_remove_chunk(struct btrfs_trans_handle *trans,
 	trace_btrfs_chunk_free(fs_info, map, chunk_offset, em->len);
 
 	if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) {
-		ret = btrfs_del_sys_chunk(fs_info, chunk_objectid,
-					  chunk_offset);
+		ret = btrfs_del_sys_chunk(fs_info, chunk_offset);
 		if (ret) {
 			btrfs_abort_transaction(trans, ret);
 			goto out;
@@ -3312,7 +3293,6 @@ static int chunk_devid_filter(struct extent_buffer *leaf,
 /* [pstart, pend) */
 static int chunk_drange_filter(struct extent_buffer *leaf,
 			       struct btrfs_chunk *chunk,
-			       u64 chunk_offset,
 			       struct btrfs_balance_args *bargs)
 {
 	struct btrfs_stripe *stripe;
@@ -3439,7 +3419,7 @@ static int should_balance_chunk(struct btrfs_fs_info *fs_info,
 
 	/* drange filter, makes sense only with devid filter */
 	if ((bargs->flags & BTRFS_BALANCE_ARGS_DRANGE) &&
-	    chunk_drange_filter(leaf, chunk, chunk_offset, bargs)) {
+	    chunk_drange_filter(leaf, chunk, bargs)) {
 		return 0;
 	}
 
@@ -3898,13 +3878,6 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
 			   meta_target, data_target);
 	}
 
-	if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) {
-		fs_info->num_tolerated_disk_barrier_failures = min(
-			btrfs_calc_num_tolerated_disk_barrier_failures(fs_info),
-			btrfs_get_num_tolerated_disk_barrier_failures(
-				bctl->sys.target));
-	}
-
 	ret = insert_balance_item(fs_info, bctl);
 	if (ret && ret != -EEXIST)
 		goto out;
@@ -3927,11 +3900,6 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
 	mutex_lock(&fs_info->balance_mutex);
 	atomic_dec(&fs_info->balance_running);
 
-	if (bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) {
-		fs_info->num_tolerated_disk_barrier_failures =
-			btrfs_calc_num_tolerated_disk_barrier_failures(fs_info);
-	}
-
 	if (bargs) {
 		memset(bargs, 0, sizeof(*bargs));
 		update_ioctl_balance_args(fs_info, 0, bargs);
@@ -4127,7 +4095,6 @@ static int btrfs_uuid_scan_kthread(void *data)
 	struct btrfs_fs_info *fs_info = data;
 	struct btrfs_root *root = fs_info->tree_root;
 	struct btrfs_key key;
-	struct btrfs_key max_key;
 	struct btrfs_path *path = NULL;
 	int ret = 0;
 	struct extent_buffer *eb;
@@ -4146,10 +4113,6 @@ static int btrfs_uuid_scan_kthread(void *data)
 	key.type = BTRFS_ROOT_ITEM_KEY;
 	key.offset = 0;
 
-	max_key.objectid = (u64)-1;
-	max_key.type = BTRFS_ROOT_ITEM_KEY;
-	max_key.offset = (u64)-1;
-
 	while (1) {
 		ret = btrfs_search_forward(root, &key, path, 0);
 		if (ret) {
@@ -4601,12 +4564,6 @@ static int btrfs_cmp_device_info(const void *a, const void *b)
 	return 0;
 }
 
-static u32 find_raid56_stripe_len(u32 data_devices, u32 dev_stripe_target)
-{
-	/* TODO allow them to set a preferred stripe size */
-	return SZ_64K;
-}
-
 static void check_raid56_incompat_flag(struct btrfs_fs_info *info, u64 type)
 {
 	if (!(type & BTRFS_BLOCK_GROUP_RAID56_MASK))
@@ -4629,7 +4586,7 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 {
 	struct btrfs_fs_info *info = trans->fs_info;
 	struct btrfs_fs_devices *fs_devices = info->fs_devices;
-	struct list_head *cur;
+	struct btrfs_device *device;
 	struct map_lookup *map = NULL;
 	struct extent_map_tree *em_tree;
 	struct extent_map *em;
@@ -4649,7 +4606,6 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 	u64 max_chunk_size;
 	u64 stripe_size;
 	u64 num_bytes;
-	u64 raid_stripe_len = BTRFS_STRIPE_LEN;
 	int ndevs;
 	int i;
 	int j;
@@ -4703,22 +4659,15 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 	if (!devices_info)
 		return -ENOMEM;
 
-	cur = fs_devices->alloc_list.next;
-
 	/*
 	 * in the first pass through the devices list, we gather information
 	 * about the available holes on each device.
 	 */
 	ndevs = 0;
-	while (cur != &fs_devices->alloc_list) {
-		struct btrfs_device *device;
+	list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) {
 		u64 max_avail;
 		u64 dev_offset;
 
-		device = list_entry(cur, struct btrfs_device, dev_alloc_list);
-
-		cur = cur->next;
-
 		if (!device->writeable) {
 			WARN(1, KERN_ERR
 			       "BTRFS: read-only device in alloc_list\n");
@@ -4769,15 +4718,15 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 	     btrfs_cmp_device_info, NULL);
 
 	/* round down to number of usable stripes */
-	ndevs -= ndevs % devs_increment;
+	ndevs = round_down(ndevs, devs_increment);
 
 	if (ndevs < devs_increment * sub_stripes || ndevs < devs_min) {
 		ret = -ENOSPC;
 		goto error;
 	}
 
-	if (devs_max && ndevs > devs_max)
-		ndevs = devs_max;
+	ndevs = min(ndevs, devs_max);
+
 	/*
 	 * the primary goal is to maximize the number of stripes, so use as many
 	 * devices as possible, even if the stripes are not maximum sized.
@@ -4791,16 +4740,11 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 	 */
 	data_stripes = num_stripes / ncopies;
 
-	if (type & BTRFS_BLOCK_GROUP_RAID5) {
-		raid_stripe_len = find_raid56_stripe_len(ndevs - 1,
-							 info->stripesize);
+	if (type & BTRFS_BLOCK_GROUP_RAID5)
 		data_stripes = num_stripes - 1;
-	}
-	if (type & BTRFS_BLOCK_GROUP_RAID6) {
-		raid_stripe_len = find_raid56_stripe_len(ndevs - 2,
-							 info->stripesize);
+
+	if (type & BTRFS_BLOCK_GROUP_RAID6)
 		data_stripes = num_stripes - 2;
-	}
 
 	/*
 	 * Use the number of data stripes to figure out how big this chunk
@@ -4825,8 +4769,7 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 	stripe_size = div_u64(stripe_size, dev_stripes);
 
 	/* align to BTRFS_STRIPE_LEN */
-	stripe_size = div64_u64(stripe_size, raid_stripe_len);
-	stripe_size *= raid_stripe_len;
+	stripe_size = round_down(stripe_size, BTRFS_STRIPE_LEN);
 
 	map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
 	if (!map) {
@@ -4843,10 +4786,9 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 						   j * stripe_size;
 		}
 	}
-	map->sector_size = info->sectorsize;
-	map->stripe_len = raid_stripe_len;
-	map->io_align = raid_stripe_len;
-	map->io_width = raid_stripe_len;
+	map->stripe_len = BTRFS_STRIPE_LEN;
+	map->io_align = BTRFS_STRIPE_LEN;
+	map->io_width = BTRFS_STRIPE_LEN;
 	map->type = type;
 	map->sub_stripes = sub_stripes;
 
@@ -4881,9 +4823,7 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 		goto error;
 	}
 
-	ret = btrfs_make_block_group(trans, info, 0, type,
-				     BTRFS_FIRST_CHUNK_TREE_OBJECTID,
-				     start, num_bytes);
+	ret = btrfs_make_block_group(trans, info, 0, type, start, num_bytes);
 	if (ret)
 		goto error_del_extent;
 
@@ -4963,11 +4903,8 @@ int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
 		ret = btrfs_update_device(trans, device);
 		if (ret)
 			break;
-		ret = btrfs_alloc_dev_extent(trans, device,
-					     chunk_root->root_key.objectid,
-					     BTRFS_FIRST_CHUNK_TREE_OBJECTID,
-					     chunk_offset, dev_offset,
-					     stripe_size);
+		ret = btrfs_alloc_dev_extent(trans, device, chunk_offset,
+					     dev_offset, stripe_size);
 		if (ret)
 			break;
 	}
@@ -5172,7 +5109,6 @@ int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
 }
 
 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
-				    struct btrfs_mapping_tree *map_tree,
 				    u64 logical)
 {
 	struct extent_map *em;
@@ -5180,29 +5116,30 @@ unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
 	unsigned long len = fs_info->sectorsize;
 
 	em = get_chunk_map(fs_info, logical, len);
-	WARN_ON(IS_ERR(em));
 
-	map = em->map_lookup;
-	if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
-		len = map->stripe_len * nr_data_stripes(map);
-	free_extent_map(em);
+	if (!WARN_ON(IS_ERR(em))) {
+		map = em->map_lookup;
+		if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
+			len = map->stripe_len * nr_data_stripes(map);
+		free_extent_map(em);
+	}
 	return len;
 }
 
-int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
-			   u64 logical, u64 len, int mirror_num)
+int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
 {
 	struct extent_map *em;
 	struct map_lookup *map;
 	int ret = 0;
 
 	em = get_chunk_map(fs_info, logical, len);
-	WARN_ON(IS_ERR(em));
 
-	map = em->map_lookup;
-	if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
-		ret = 1;
-	free_extent_map(em);
+	if(!WARN_ON(IS_ERR(em))) {
+		map = em->map_lookup;
+		if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
+			ret = 1;
+		free_extent_map(em);
+	}
 	return ret;
 }
 
@@ -6295,9 +6232,8 @@ struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
 	cur_devices = fs_info->fs_devices;
 	while (cur_devices) {
 		if (!fsid ||
-		    !memcmp(cur_devices->fsid, fsid, BTRFS_UUID_SIZE)) {
-			device = __find_device(&cur_devices->devices,
-					       devid, uuid);
+		    !memcmp(cur_devices->fsid, fsid, BTRFS_FSID_SIZE)) {
+			device = find_device(cur_devices, devid, uuid);
 			if (device)
 				return device;
 		}
@@ -6450,7 +6386,6 @@ static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key,
 	struct extent_map *em;
 	u64 logical;
 	u64 length;
-	u64 stripe_len;
 	u64 devid;
 	u8 uuid[BTRFS_UUID_SIZE];
 	int num_stripes;
@@ -6459,7 +6394,6 @@ static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key,
 
 	logical = key->offset;
 	length = btrfs_chunk_length(leaf, chunk);
-	stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
 	num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
 
 	ret = btrfs_check_chunk_valid(fs_info, leaf, chunk, logical);
@@ -6498,7 +6432,6 @@ static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key,
 	map->num_stripes = num_stripes;
 	map->io_width = btrfs_chunk_io_width(leaf, chunk);
 	map->io_align = btrfs_chunk_io_align(leaf, chunk);
-	map->sector_size = btrfs_chunk_sector_size(leaf, chunk);
 	map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
 	map->type = btrfs_chunk_type(leaf, chunk);
 	map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);
@@ -6514,6 +6447,7 @@ static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key,
 		if (!map->stripes[i].dev &&
 		    !btrfs_test_opt(fs_info, DEGRADED)) {
 			free_extent_map(em);
+			btrfs_report_missing_device(fs_info, devid, uuid);
 			return -EIO;
 		}
 		if (!map->stripes[i].dev) {
@@ -6524,8 +6458,7 @@ static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key,
 				free_extent_map(em);
 				return -EIO;
 			}
-			btrfs_warn(fs_info, "devid %llu uuid %pU is missing",
-				   devid, uuid);
+			btrfs_report_missing_device(fs_info, devid, uuid);
 		}
 		map->stripes[i].dev->in_fs_metadata = 1;
 	}
@@ -6569,10 +6502,11 @@ static struct btrfs_fs_devices *open_seed_devices(struct btrfs_fs_info *fs_info,
 	int ret;
 
 	BUG_ON(!mutex_is_locked(&uuid_mutex));
+	ASSERT(fsid);
 
 	fs_devices = fs_info->fs_devices->seed;
 	while (fs_devices) {
-		if (!memcmp(fs_devices->fsid, fsid, BTRFS_UUID_SIZE))
+		if (!memcmp(fs_devices->fsid, fsid, BTRFS_FSID_SIZE))
 			return fs_devices;
 
 		fs_devices = fs_devices->seed;
@@ -6625,16 +6559,16 @@ static int read_one_dev(struct btrfs_fs_info *fs_info,
 	struct btrfs_device *device;
 	u64 devid;
 	int ret;
-	u8 fs_uuid[BTRFS_UUID_SIZE];
+	u8 fs_uuid[BTRFS_FSID_SIZE];
 	u8 dev_uuid[BTRFS_UUID_SIZE];
 
 	devid = btrfs_device_id(leaf, dev_item);
 	read_extent_buffer(leaf, dev_uuid, btrfs_device_uuid(dev_item),
 			   BTRFS_UUID_SIZE);
 	read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item),
-			   BTRFS_UUID_SIZE);
+			   BTRFS_FSID_SIZE);
 
-	if (memcmp(fs_uuid, fs_info->fsid, BTRFS_UUID_SIZE)) {
+	if (memcmp(fs_uuid, fs_info->fsid, BTRFS_FSID_SIZE)) {
 		fs_devices = open_seed_devices(fs_info, fs_uuid);
 		if (IS_ERR(fs_devices))
 			return PTR_ERR(fs_devices);
@@ -6642,17 +6576,21 @@ static int read_one_dev(struct btrfs_fs_info *fs_info,
 
 	device = btrfs_find_device(fs_info, devid, dev_uuid, fs_uuid);
 	if (!device) {
-		if (!btrfs_test_opt(fs_info, DEGRADED))
+		if (!btrfs_test_opt(fs_info, DEGRADED)) {
+			btrfs_report_missing_device(fs_info, devid, dev_uuid);
 			return -EIO;
+		}
 
 		device = add_missing_dev(fs_devices, devid, dev_uuid);
 		if (!device)
 			return -ENOMEM;
-		btrfs_warn(fs_info, "devid %llu uuid %pU missing",
-				devid, dev_uuid);
+		btrfs_report_missing_device(fs_info, devid, dev_uuid);
 	} else {
-		if (!device->bdev && !btrfs_test_opt(fs_info, DEGRADED))
-			return -EIO;
+		if (!device->bdev) {
+			btrfs_report_missing_device(fs_info, devid, dev_uuid);
+			if (!btrfs_test_opt(fs_info, DEGRADED))
+				return -EIO;
+		}
 
 		if(!device->bdev && !device->missing) {
 			/*
@@ -6818,6 +6756,70 @@ out_short_read:
 	return -EIO;
 }
 
+void btrfs_report_missing_device(struct btrfs_fs_info *fs_info, u64 devid,
+				 u8 *uuid)
+{
+	btrfs_warn_rl(fs_info, "devid %llu uuid %pU is missing", devid, uuid);
+}
+
+/*
+ * Check if all chunks in the fs are OK for read-write degraded mount
+ *
+ * Return true if all chunks meet the minimal RW mount requirements.
+ * Return false if any chunk doesn't meet the minimal RW mount requirements.
+ */
+bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info)
+{
+	struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
+	struct extent_map *em;
+	u64 next_start = 0;
+	bool ret = true;
+
+	read_lock(&map_tree->map_tree.lock);
+	em = lookup_extent_mapping(&map_tree->map_tree, 0, (u64)-1);
+	read_unlock(&map_tree->map_tree.lock);
+	/* No chunk at all? Return false anyway */
+	if (!em) {
+		ret = false;
+		goto out;
+	}
+	while (em) {
+		struct map_lookup *map;
+		int missing = 0;
+		int max_tolerated;
+		int i;
+
+		map = em->map_lookup;
+		max_tolerated =
+			btrfs_get_num_tolerated_disk_barrier_failures(
+					map->type);
+		for (i = 0; i < map->num_stripes; i++) {
+			struct btrfs_device *dev = map->stripes[i].dev;
+
+			if (!dev || !dev->bdev || dev->missing ||
+			    dev->last_flush_error)
+				missing++;
+		}
+		if (missing > max_tolerated) {
+			btrfs_warn(fs_info,
+	"chunk %llu missing %d devices, max tolerance is %d for writeable mount",
+				   em->start, missing, max_tolerated);
+			free_extent_map(em);
+			ret = false;
+			goto out;
+		}
+		next_start = extent_map_end(em);
+		free_extent_map(em);
+
+		read_lock(&map_tree->map_tree.lock);
+		em = lookup_extent_mapping(&map_tree->map_tree, next_start,
+					   (u64)(-1) - next_start);
+		read_unlock(&map_tree->map_tree.lock);
+	}
+out:
+	return ret;
+}
+
 int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info)
 {
 	struct btrfs_root *root = fs_info->chunk_root;
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 93277fc60930..6108fdfec67f 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -353,7 +353,6 @@ struct map_lookup {
 	int io_align;
 	int io_width;
 	u64 stripe_len;
-	int sector_size;
 	int num_stripes;
 	int sub_stripes;
 	struct btrfs_bio_stripe stripes[];
@@ -481,9 +480,8 @@ void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
 					      struct btrfs_device *tgtdev);
 void btrfs_scratch_superblocks(struct block_device *bdev, const char *device_path);
 int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
-			   u64 logical, u64 len, int mirror_num);
+			   u64 logical, u64 len);
 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
-				    struct btrfs_mapping_tree *map_tree,
 				    u64 logical);
 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
 				struct btrfs_fs_info *fs_info,
@@ -543,4 +541,8 @@ struct list_head *btrfs_get_fs_uuids(void);
 void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info);
 void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info);
 
+bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info);
+void btrfs_report_missing_device(struct btrfs_fs_info *fs_info, u64 devid,
+				 u8 *uuid);
+
 #endif