btrfs: Add noenospc_debug mount option.

Add noenospc_debug mount option to disable ENOSPC debug with
remount option.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/Documentation/filesystems/btrfs.txt b/Documentation/filesystems/btrfs.txt
index 7254cf5..13a7cac 100644 (file)
--- a/Documentation/filesystems/btrfs.txt
+++ b/Documentation/filesystems/btrfs.txt
@@ -108,8 +108,9 @@ Options with (*) are default options and will not show in the mount options.
        performance impact.  (The fstrim command is also available to
        initiate batch trims from userspace).
 
+  noenospc_debug(*)
   enospc_debug
-       Debugging option to be more verbose in some ENOSPC conditions.
+       Disable/enable debugging option to be more verbose in some ENOSPC conditions.
 
   fatal_errors=<action>
        Action to take when encountering a fatal error: 

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index e153770..8325406 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -324,6 +324,7 @@ enum {
        Opt_check_integrity, Opt_check_integrity_including_extent_data,
        Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree,
        Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard,
+       Opt_noenospc_debug,
        Opt_err,
 };
 
@@ -356,6 +357,7 @@ static match_table_t tokens = {
        {Opt_clear_cache, "clear_cache"},
        {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"},
        {Opt_enospc_debug, "enospc_debug"},
+       {Opt_noenospc_debug, "noenospc_debug"},
        {Opt_subvolrootid, "subvolrootid=%d"},
        {Opt_defrag, "autodefrag"},
        {Opt_nodefrag, "noautodefrag"},
@@ -603,6 +605,9 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
                case Opt_enospc_debug:
                        btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG);
                        break;
+               case Opt_noenospc_debug:
+                       btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG);
+                       break;
                case Opt_defrag:
                        btrfs_info(root->fs_info, "enabling auto defrag");
                        btrfs_set_opt(info->mount_opt, AUTO_DEFRAG);