btrfs: Add noautodefrag mount option.
Btrfs has autodefrag mount option but no pairing noautodefrag option,
which makes it impossible to disable autodefrag without umount.
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/fs/btrfs/super.c b/fs/btrfs/super.c
index b02d25a..44513f3 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -323,7 +323,7 @@
Opt_no_space_cache, Opt_recovery, Opt_skip_balance,
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_commit_interval, Opt_barrier, Opt_nodefrag,
Opt_err,
};
@@ -357,6 +357,7 @@
{Opt_enospc_debug, "enospc_debug"},
{Opt_subvolrootid, "subvolrootid=%d"},
{Opt_defrag, "autodefrag"},
+ {Opt_nodefrag, "noautodefrag"},
{Opt_inode_cache, "inode_cache"},
{Opt_no_space_cache, "nospace_cache"},
{Opt_recovery, "recovery"},
@@ -602,6 +603,11 @@
btrfs_info(root->fs_info, "enabling auto defrag");
btrfs_set_opt(info->mount_opt, AUTO_DEFRAG);
break;
+ case Opt_nodefrag:
+ if (btrfs_test_opt(root, AUTO_DEFRAG))
+ btrfs_info(root->fs_info, "disabling auto defrag");
+ btrfs_clear_opt(info->mount_opt, AUTO_DEFRAG);
+ break;
case Opt_recovery:
btrfs_info(root->fs_info, "enabling auto recovery");
btrfs_set_opt(info->mount_opt, RECOVERY);