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authorNaohiro Aota <naohiro.aota@wdc.com>2022-03-29 09:55:58 +0300
committerDavid Sterba <dsterba@suse.com>2022-04-06 01:49:50 +0300
commita690e5f2db4d1dca742ce734aaff9f3112d63764 (patch)
tree996c090e12c2bbe40b8ecf9f311d5608fae67f4b /fs/btrfs/volumes.c
parentd03ae0d3b687223de24d3dd1a7bca96034aeca25 (diff)
downloadlinux-a690e5f2db4d1dca742ce734aaff9f3112d63764.tar.xz
btrfs: mark resumed async balance as writing
When btrfs balance is interrupted with umount, the background balance resumes on the next mount. There is a potential deadlock with FS freezing here like as described in commit 26559780b953 ("btrfs: zoned: mark relocation as writing"). Mark the process as sb_writing to avoid it. Reviewed-by: Filipe Manana <fdmanana@suse.com> CC: stable@vger.kernel.org # 4.9+ Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/volumes.c')
-rw-r--r--fs/btrfs/volumes.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 2cfbc74a3b4e..a8cc736731fd 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4430,10 +4430,12 @@ static int balance_kthread(void *data)
struct btrfs_fs_info *fs_info = data;
int ret = 0;
+ sb_start_write(fs_info->sb);
mutex_lock(&fs_info->balance_mutex);
if (fs_info->balance_ctl)
ret = btrfs_balance(fs_info, fs_info->balance_ctl, NULL);
mutex_unlock(&fs_info->balance_mutex);
+ sb_end_write(fs_info->sb);
return ret;
}