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md/raid5: add rcu protection to rdev accesses in handle_failed_sync.

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The rdev could be freed while handle_failed_sync is running, so
rcu protection is needed.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
NeilBrown 2016-06-02 16:19:52 +10:00 committed by Shaohua Li
parent 707a6a420c
commit e50d399232
1 changed files with 4 additions and 2 deletions
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6
drivers/md/raid5.c
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@ -3210,15 +3210,16 @@ handle_failed_sync(struct r5conf *conf, struct stripe_head *sh,
/* During recovery devices cannot be removed, so
* locking and refcounting of rdevs is not needed
*/
rcu_read_lock();
for (i = 0; i < conf->raid_disks; i++) {
struct md_rdev *rdev = conf->disks[i].rdev;
struct md_rdev *rdev = rcu_dereference(conf->disks[i].rdev);
if (rdev
&& !test_bit(Faulty, &rdev->flags)
&& !test_bit(In_sync, &rdev->flags)
&& !rdev_set_badblocks(rdev, sh->sector,
STRIPE_SECTORS, 0))
abort = 1;
rdev = conf->disks[i].replacement;
rdev = rcu_dereference(conf->disks[i].replacement);
if (rdev
&& !test_bit(Faulty, &rdev->flags)
&& !test_bit(In_sync, &rdev->flags)
@ -3226,6 +3227,7 @@ handle_failed_sync(struct r5conf *conf, struct stripe_head *sh,
STRIPE_SECTORS, 0))
abort = 1;
}
rcu_read_unlock();
if (abort)
conf->recovery_disabled =
conf->mddev->recovery_disabled;