diff options
| author | Sergei Trofimovich <slyfox@gentoo.org> | 2014-04-07 11:55:46 +0400 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2014-04-07 21:41:52 +0400 |
| commit | 800ee2247f483b6d05ed47ef3bbc90b56451746c (patch) | |
| tree | 3d68c155af1488fb53c8b38e6ed4c6734d6b246d | |
| parent | c4a050bbbb5d7dab03aa720af36d8e91ed7f2ec8 (diff) | |
| download | linux-800ee2247f483b6d05ed47ef3bbc90b56451746c.tar.xz | |
btrfs: fix crash in remount(thread_pool=) case
Reproducer:
mount /dev/ubda /mnt
mount -oremount,thread_pool=42 /mnt
Gives a crash:
? btrfs_workqueue_set_max+0x0/0x70
btrfs_resize_thread_pool+0xe3/0xf0
? sync_filesystem+0x0/0xc0
? btrfs_resize_thread_pool+0x0/0xf0
btrfs_remount+0x1d2/0x570
? kern_path+0x0/0x80
do_remount_sb+0xd9/0x1c0
do_mount+0x26a/0xbf0
? kfree+0x0/0x1b0
SyS_mount+0xc4/0x110
It's a call
btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, new_pool_size);
with
fs_info->scrub_wr_completion_workers = NULL;
as scrub wqs get created only on user's demand.
Patch skips not-created-yet workqueues.
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
CC: Qu Wenruo <quwenruo@cn.fujitsu.com>
CC: Chris Mason <clm@fb.com>
CC: Josef Bacik <jbacik@fb.com>
CC: linux-btrfs@vger.kernel.org
Signed-off-by: Chris Mason <clm@fb.com>
| -rw-r--r-- | fs/btrfs/async-thread.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c index ecb5832c0967..5a201d81049c 100644 --- a/fs/btrfs/async-thread.c +++ b/fs/btrfs/async-thread.c @@ -323,6 +323,8 @@ void btrfs_destroy_workqueue(struct btrfs_workqueue *wq) void btrfs_workqueue_set_max(struct btrfs_workqueue *wq, int max) { + if (!wq) + return; wq->normal->max_active = max; if (wq->high) wq->high->max_active = max; |