5 files changed, 34 insertions, 14 deletions

diff --git a/fs/udf/file.c b/fs/udf/file.c
index 86c6743ec1fe..bb15771b92ae 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -223,11 +223,18 @@ out:
 
 static int udf_release_file(struct inode *inode, struct file *filp)
 {
-	if (filp->f_mode & FMODE_WRITE) {
+	if (filp->f_mode & FMODE_WRITE &&
+	    atomic_read(&inode->i_writecount) > 1) {
+		/*
+		 * Grab i_mutex to avoid races with writes changing i_size
+		 * while we are running.
+		 */
+		mutex_lock(&inode->i_mutex);
 		down_write(&UDF_I(inode)->i_data_sem);
 		udf_discard_prealloc(inode);
 		udf_truncate_tail_extent(inode);
 		up_write(&UDF_I(inode)->i_data_sem);
+		mutex_unlock(&inode->i_mutex);
 	}
 	return 0;
 }
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 08598843288f..c9b4df5810d5 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1277,7 +1277,7 @@ update_time:
  */
 #define UDF_MAX_ICB_NESTING 1024
 
-static int udf_read_inode(struct inode *inode)
+static int udf_read_inode(struct inode *inode, bool hidden_inode)
 {
 	struct buffer_head *bh = NULL;
 	struct fileEntry *fe;
@@ -1436,8 +1436,11 @@ reread:
 
 	link_count = le16_to_cpu(fe->fileLinkCount);
 	if (!link_count) {
-		ret = -ESTALE;
-		goto out;
+		if (!hidden_inode) {
+			ret = -ESTALE;
+			goto out;
+		}
+		link_count = 1;
 	}
 	set_nlink(inode, link_count);
 
@@ -1826,7 +1829,8 @@ out:
 	return err;
 }
 
-struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
+struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
+			 bool hidden_inode)
 {
 	unsigned long block = udf_get_lb_pblock(sb, ino, 0);
 	struct inode *inode = iget_locked(sb, block);
@@ -1839,7 +1843,7 @@ struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
 		return inode;
 
 	memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
-	err = udf_read_inode(inode);
+	err = udf_read_inode(inode, hidden_inode);
 	if (err < 0) {
 		iget_failed(inode);
 		return ERR_PTR(err);
diff --git a/fs/udf/super.c b/fs/udf/super.c
index 5401fc33f5cc..e229315bbf7a 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -959,7 +959,7 @@ struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 	addr.logicalBlockNum = meta_file_loc;
 	addr.partitionReferenceNum = partition_num;
 
-	metadata_fe = udf_iget(sb, &addr);
+	metadata_fe = udf_iget_special(sb, &addr);
 
 	if (IS_ERR(metadata_fe)) {
 		udf_warn(sb, "metadata inode efe not found\n");
@@ -1020,7 +1020,7 @@ static int udf_load_metadata_files(struct super_block *sb, int partition)
 		udf_debug("Bitmap file location: block = %d part = %d\n",
 			  addr.logicalBlockNum, addr.partitionReferenceNum);
 
-		fe = udf_iget(sb, &addr);
+		fe = udf_iget_special(sb, &addr);
 		if (IS_ERR(fe)) {
 			if (sb->s_flags & MS_RDONLY)
 				udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
@@ -1119,7 +1119,7 @@ static int udf_fill_partdesc_info(struct super_block *sb,
 		};
 		struct inode *inode;
 
-		inode = udf_iget(sb, &loc);
+		inode = udf_iget_special(sb, &loc);
 		if (IS_ERR(inode)) {
 			udf_debug("cannot load unallocSpaceTable (part %d)\n",
 				  p_index);
@@ -1154,7 +1154,7 @@ static int udf_fill_partdesc_info(struct super_block *sb,
 		};
 		struct inode *inode;
 
-		inode = udf_iget(sb, &loc);
+		inode = udf_iget_special(sb, &loc);
 		if (IS_ERR(inode)) {
 			udf_debug("cannot load freedSpaceTable (part %d)\n",
 				  p_index);
@@ -1198,7 +1198,7 @@ static void udf_find_vat_block(struct super_block *sb, int p_index,
 	     vat_block >= map->s_partition_root &&
 	     vat_block >= start_block - 3; vat_block--) {
 		ino.logicalBlockNum = vat_block - map->s_partition_root;
-		inode = udf_iget(sb, &ino);
+		inode = udf_iget_special(sb, &ino);
 		if (!IS_ERR(inode)) {
 			sbi->s_vat_inode = inode;
 			break;
diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
index 742557be9936..1cc3c993ebd0 100644
--- a/fs/udf/udfdecl.h
+++ b/fs/udf/udfdecl.h
@@ -138,7 +138,18 @@ extern int udf_write_fi(struct inode *inode, struct fileIdentDesc *,
 /* file.c */
 extern long udf_ioctl(struct file *, unsigned int, unsigned long);
 /* inode.c */
-extern struct inode *udf_iget(struct super_block *, struct kernel_lb_addr *);
+extern struct inode *__udf_iget(struct super_block *, struct kernel_lb_addr *,
+				bool hidden_inode);
+static inline struct inode *udf_iget_special(struct super_block *sb,
+					     struct kernel_lb_addr *ino)
+{
+	return __udf_iget(sb, ino, true);
+}
+static inline struct inode *udf_iget(struct super_block *sb,
+				     struct kernel_lb_addr *ino)
+{
+	return __udf_iget(sb, ino, false);
+}
 extern int udf_expand_file_adinicb(struct inode *);
 extern struct buffer_head *udf_expand_dir_adinicb(struct inode *, int *, int *);
 extern struct buffer_head *udf_bread(struct inode *, int, int, int *);
diff --git a/fs/udf/udftime.c b/fs/udf/udftime.c
index 1f11483eba6a..77c331f1a770 100644
--- a/fs/udf/udftime.c
+++ b/fs/udf/udftime.c
@@ -81,8 +81,6 @@ static time_t year_seconds[MAX_YEAR_SECONDS] = {
 /*2038*/ SPY(68, 17, 0)
 };
 
-extern struct timezone sys_tz;
-
 #define SECS_PER_HOUR	(60 * 60)
 #define SECS_PER_DAY	(SECS_PER_HOUR * 24)