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| author | Ethan Lien <ethanlien@synology.com> | 2018-07-02 15:44:58 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2018-08-06 13:12:48 +0200 |
| commit | d814a49198eafa6163698bdd93961302f3a877a4 (patch) | |
| tree | 8f0b874e4c5af13bbd6210919d40eaf0a7efc499 /fs | |
| parent | 36350e95a2b1feed6382fe38cc80f79ec35a1323 (diff) | |
| download | lwn-d814a49198eafa6163698bdd93961302f3a877a4.tar.gz lwn-d814a49198eafa6163698bdd93961302f3a877a4.zip | |
btrfs: use correct compare function of dirty_metadata_bytes
We use customized, nodesize batch value to update dirty_metadata_bytes.
We should also use batch version of compare function or we will easily
goto fast path and get false result from percpu_counter_compare().
Fixes: e2d845211eda ("Btrfs: use percpu counter for dirty metadata count")
CC: stable@vger.kernel.org # 4.4+
Signed-off-by: Ethan Lien <ethanlien@synology.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/disk-io.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 6023eed3e805..e3858b2fe014 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -959,8 +959,9 @@ static int btree_writepages(struct address_space *mapping, fs_info = BTRFS_I(mapping->host)->root->fs_info; /* this is a bit racy, but that's ok */ - ret = percpu_counter_compare(&fs_info->dirty_metadata_bytes, - BTRFS_DIRTY_METADATA_THRESH); + ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes, + BTRFS_DIRTY_METADATA_THRESH, + fs_info->dirty_metadata_batch); if (ret < 0) return 0; } @@ -4134,8 +4135,9 @@ static void __btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info, if (flush_delayed) btrfs_balance_delayed_items(fs_info); - ret = percpu_counter_compare(&fs_info->dirty_metadata_bytes, - BTRFS_DIRTY_METADATA_THRESH); + ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes, + BTRFS_DIRTY_METADATA_THRESH, + fs_info->dirty_metadata_batch); if (ret > 0) { balance_dirty_pages_ratelimited(fs_info->btree_inode->i_mapping); } |