diff options
| author | NeilBrown <neilb@suse.de> | 2012-04-12 16:05:06 +1000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-04-22 15:30:58 -0700 |
| commit | a629c2618e2a20298495c9b4f8a160d180486733 (patch) | |
| tree | 4c5394d7d83dd397dd37c1b968f8bf666d6c3171 /drivers | |
| parent | d617eb618c92074139136cb083d78aa91ad544ee (diff) | |
md/bitmap: prevent bitmap_daemon_work running while initialising bitmap
commit afbaa90b80b1ec66e5137cc3824746bfdf559b18 upstream.
If a bitmap is added while the array is active, it is possible
for bitmap_daemon_work to run while the bitmap is being
initialised.
This is particularly a problem if bitmap_daemon_work sees
bitmap->filemap as non-NULL before it has been filled in properly.
So hold bitmap_info.mutex while filling in ->filemap
to prevent problems.
This patch is suitable for any -stable kernel, though it might not
apply cleanly before about 3.1.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/bitmap.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index 2a8722b9f91b..62a8e6828aed 100644 --- a/drivers/md/bitmap.c +++ b/drivers/md/bitmap.c @@ -1819,7 +1819,9 @@ int bitmap_load(struct mddev *mddev) * re-add of a missing device */ start = mddev->recovery_cp; + mutex_lock(&mddev->bitmap_info.mutex); err = bitmap_init_from_disk(bitmap, start); + mutex_unlock(&mddev->bitmap_info.mutex); if (err) goto out; |