[PATCH 3.16 330/357] md/raid1: be more cautious where we read-balance during resync.

From: Greg Kroah-Hartman
Date: Fri Oct 03 2014 - 18:13:16 EST


3.16-stable review patch. If anyone has any objections, please let me know.

------------------

From: NeilBrown <neilb@xxxxxxx>

commit c6d119cf1b5a778e9ed60a006e2a434fcc4471a2 upstream.

commit 79ef3a8aa1cb1523cc231c9a90a278333c21f761 made
it possible for reads to happen concurrently with resync.
This means that we need to be more careful where read_balancing
is allowed during resync - we can no longer be sure that any
resync that has already started will definitely finish.

So keep read_balancing to before recovery_cp, which is conservative
but safe.

This bug makes it possible to read from a device that doesn't
have up-to-date data, so it can cause data corruption.
So it is suitable for any kernel since 3.11.

Fixes: 79ef3a8aa1cb1523cc231c9a90a278333c21f761
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/md/raid1.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)

--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -540,11 +540,7 @@ static int read_balance(struct r1conf *c
has_nonrot_disk = 0;
choose_next_idle = 0;

- if (conf->mddev->recovery_cp < MaxSector &&
- (this_sector + sectors >= conf->next_resync))
- choose_first = 1;
- else
- choose_first = 0;
+ choose_first = (conf->mddev->recovery_cp < this_sector + sectors);

for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) {
sector_t dist;


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