Btrfs has autodefrag mount option but no pairing noautodefrag option,
which makes it impossible to disable autodefrag without umount.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
Reviewed-by: David Sterba <dste...@suse.cz>
---
Changelog:
v2: Add noautodefrag option
v3: None
---
Documentation/filesystems/btrfs.txt | 8 +++++---
fs/btrfs/super.c | 8 +++++++-
2 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/Documentation/filesystems/btrfs.txt
b/Documentation/filesystems/btrfs.txt
index ce487a2..e87609a 100644
--- a/Documentation/filesystems/btrfs.txt
+++ b/Documentation/filesystems/btrfs.txt
@@ -46,10 +46,12 @@ Options with (*) are default options and will not show in
the mount options.
bytes, optionally with a K, M, or G suffix, case insensitive.
Default is 1MB.
+ noautodefrag(*)
autodefrag
- Detect small random writes into files and queue them up for the
- defrag process. Works best for small files; Not well suited for
- large database workloads.
+ Disable/enable auto defragmentation.
+ Auto defragmentation detects small random writes into files and queue
+ them up for the defrag process. Works best for small files;
+ Not well suited for large database workloads.
check_int
check_int_data
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index fe9d8a6..c65f696 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -323,7 +323,7 @@ enum {
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 @@ static match_table_t tokens = {
{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 @@ int btrfs_parse_options(struct btrfs_root *root, char
*options)
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);
--
1.8.5.2
--
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