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authorNeilBrown <neilb@suse.de>2014-07-02 12:04:14 +1000
committerNeilBrown <neilb@suse.de>2014-07-03 10:44:45 +1000
commit133d4527eab8d199a62eee6bd433f0776842df2e (patch)
tree129c8bd83f369efda8573797438605209b43b3e7 /drivers
parent9bd359203210efeb5d8f0d81c155079f34b47449 (diff)
md: flush writes before starting a recovery.
When we write to a degraded array which has a bitmap, we make sure the relevant bit in the bitmap remains set when the write completes (so a 're-add' can quickly rebuilt a temporarily-missing device). If, immediately after such a write starts, we incorporate a spare, commence recovery, and skip over the region where the write is happening (because the 'needs recovery' flag isn't set yet), then that write will not get to the new device. Once the recovery finishes the new device will be trusted, but will have incorrect data, leading to possible corruption. We cannot set the 'needs recovery' flag when we start the write as we do not know easily if the write will be "degraded" or not. That depends on details of the particular raid level and particular write request. This patch fixes a corruption issue of long standing and so it suitable for any -stable kernel. It applied correctly to 3.0 at least and will minor editing to earlier kernels. Reported-by: Bill <billstuff2001@sbcglobal.net> Tested-by: Bill <billstuff2001@sbcglobal.net> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/53A518BB.60709@sbcglobal.net Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/md.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 817dbca6059e..32fc19c540d4 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -7501,6 +7501,19 @@ void md_do_sync(struct md_thread *thread)
rdev->recovery_offset < j)
j = rdev->recovery_offset;
rcu_read_unlock();
+
+ /* If there is a bitmap, we need to make sure all
+ * writes that started before we added a spare
+ * complete before we start doing a recovery.
+ * Otherwise the write might complete and (via
+ * bitmap_endwrite) set a bit in the bitmap after the
+ * recovery has checked that bit and skipped that
+ * region.
+ */
+ if (mddev->bitmap) {
+ mddev->pers->quiesce(mddev, 1);
+ mddev->pers->quiesce(mddev, 0);
+ }
}
printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));

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