1 files changed, 47 insertions, 5 deletions

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 377fafc76f20..edfd643a8205 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -143,6 +143,7 @@ enum {
 	Opt_snapdirname,
 	Opt_mds_namespace,
 	Opt_fscache_uniq,
+	Opt_recover_session,
 	Opt_last_string,
 	/* string args above */
 	Opt_dirstat,
@@ -184,6 +185,7 @@ static match_table_t fsopt_tokens = {
 	/* int args above */
 	{Opt_snapdirname, "snapdirname=%s"},
 	{Opt_mds_namespace, "mds_namespace=%s"},
+	{Opt_recover_session, "recover_session=%s"},
 	{Opt_fscache_uniq, "fsc=%s"},
 	/* string args above */
 	{Opt_dirstat, "dirstat"},
@@ -254,6 +256,17 @@ static int parse_fsopt_token(char *c, void *private)
 		if (!fsopt->mds_namespace)
 			return -ENOMEM;
 		break;
+	case Opt_recover_session:
+		if (!strncmp(argstr[0].from, "no",
+			     argstr[0].to - argstr[0].from)) {
+			fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER;
+		} else if (!strncmp(argstr[0].from, "clean",
+				    argstr[0].to - argstr[0].from)) {
+			fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER;
+		} else {
+			return -EINVAL;
+		}
+		break;
 	case Opt_fscache_uniq:
 		kfree(fsopt->fscache_uniq);
 		fsopt->fscache_uniq = kstrndup(argstr[0].from,
@@ -576,6 +589,10 @@ static int ceph_show_options(struct seq_file *m, struct dentry *root)
 
 	if (fsopt->mds_namespace)
 		seq_show_option(m, "mds_namespace", fsopt->mds_namespace);
+
+	if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER)
+		seq_show_option(m, "recover_session", "clean");
+
 	if (fsopt->wsize != CEPH_MAX_WRITE_SIZE)
 		seq_printf(m, ",wsize=%d", fsopt->wsize);
 	if (fsopt->rsize != CEPH_MAX_READ_SIZE)
@@ -664,6 +681,7 @@ static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 
 	fsc->sb = NULL;
 	fsc->mount_state = CEPH_MOUNT_MOUNTING;
+	fsc->filp_gen = 1;
 
 	atomic_long_set(&fsc->writeback_count, 0);
 
@@ -713,6 +731,7 @@ static void destroy_fs_client(struct ceph_fs_client *fsc)
 {
 	dout("destroy_fs_client %p\n", fsc);
 
+	ceph_mdsc_destroy(fsc);
 	destroy_workqueue(fsc->inode_wq);
 	destroy_workqueue(fsc->cap_wq);
 
@@ -829,7 +848,7 @@ static void ceph_umount_begin(struct super_block *sb)
 	fsc->mount_state = CEPH_MOUNT_SHUTDOWN;
 	ceph_osdc_abort_requests(&fsc->client->osdc, -EIO);
 	ceph_mdsc_force_umount(fsc->mdsc);
-	return;
+	fsc->filp_gen++; // invalidate open files
 }
 
 static int ceph_remount(struct super_block *sb, int *flags, char *data)
@@ -1089,7 +1108,6 @@ static struct dentry *ceph_mount(struct file_system_type *fs_type,
 	}
 
 	if (ceph_sb_to_client(sb) != fsc) {
-		ceph_mdsc_destroy(fsc);
 		destroy_fs_client(fsc);
 		fsc = ceph_sb_to_client(sb);
 		dout("get_sb got existing client %p\n", fsc);
@@ -1115,7 +1133,6 @@ out_splat:
 	goto out_final;
 
 out:
-	ceph_mdsc_destroy(fsc);
 	destroy_fs_client(fsc);
 out_final:
 	dout("ceph_mount fail %ld\n", PTR_ERR(res));
@@ -1139,8 +1156,6 @@ static void ceph_kill_sb(struct super_block *s)
 
 	ceph_fscache_unregister_fs(fsc);
 
-	ceph_mdsc_destroy(fsc);
-
 	destroy_fs_client(fsc);
 	free_anon_bdev(dev);
 }
@@ -1154,6 +1169,33 @@ static struct file_system_type ceph_fs_type = {
 };
 MODULE_ALIAS_FS("ceph");
 
+int ceph_force_reconnect(struct super_block *sb)
+{
+	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
+	int err = 0;
+
+	ceph_umount_begin(sb);
+
+	/* Make sure all page caches get invalidated.
+	 * see remove_session_caps_cb() */
+	flush_workqueue(fsc->inode_wq);
+
+	/* In case that we were blacklisted. This also reset
+	 * all mon/osd connections */
+	ceph_reset_client_addr(fsc->client);
+
+	ceph_osdc_clear_abort_err(&fsc->client->osdc);
+
+	fsc->blacklisted = false;
+	fsc->mount_state = CEPH_MOUNT_MOUNTED;
+
+	if (sb->s_root) {
+		err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
+					CEPH_STAT_CAP_INODE, true);
+	}
+	return err;
+}
+
 static int __init init_ceph(void)
 {
 	int ret = init_caches();