]> git.proxmox.com Git - mirror_ubuntu-disco-kernel.git/commit
md/bitmap: prevent bitmap_daemon_work running while initialising bitmap
authorNeilBrown <neilb@suse.de>
Thu, 12 Apr 2012 06:05:06 +0000 (16:05 +1000)
committerNeilBrown <neilb@suse.de>
Thu, 12 Apr 2012 06:05:06 +0000 (16:05 +1000)
commitafbaa90b80b1ec66e5137cc3824746bfdf559b18
tree8c0307e41849eef28146343efc4fed75f83a30f1
parentf4380a915823dbed0bf8e3cf502ebcf2b7c7f833
md/bitmap: prevent bitmap_daemon_work running while initialising bitmap

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>
drivers/md/bitmap.c