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md/bitmap: prevent bitmap_daemon_work running while initialising bitmap

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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.

Cc: stable@vger.kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2012-04-12 16:05:06 +10:00
parent f4380a9158
commit afbaa90b80
1 changed files with 2 additions and 0 deletions
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2
drivers/md/bitmap.c
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@ -1785,7 +1785,9 @@ 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;