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authorGoldwyn Rodrigues <rgoldwyn@suse.com>2015-06-24 17:30:32 +0300
committerNeilBrown <neilb@suse.com>2015-07-24 06:37:59 +0300
commit90382ed9afeafd42ef193f0eadc6b2a252d6c24d (patch)
tree3469e56a27837bfe7a01a399baccc90579e46ef6 /drivers/md/md-cluster.c
parent33e38ac6887d975fe2635c7fcaefb6d5495cb2e1 (diff)
downloadlinux-90382ed9afeafd42ef193f0eadc6b2a252d6c24d.tar.xz
Fix read-balancing during node failure
During a node failure, We need to suspend read balancing so that the reads are directed to the first device and stale data is not read. Suspending writes is not required because these would be recorded and synced eventually. A new flag MD_CLUSTER_SUSPEND_READ_BALANCING is set in recover_prep(). area_resyncing() will respond true for the entire devices if this flag is set and the request type is READ. The flag is cleared in recover_done(). Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Reported-By: David Teigland <teigland@redhat.com> Signed-off-by: NeilBrown <neilb@suse.com>
Diffstat (limited to 'drivers/md/md-cluster.c')
-rw-r--r--drivers/md/md-cluster.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index fcfc4b9b2672..0072190515e0 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -44,6 +44,7 @@ struct resync_info {
/* md_cluster_info flags */
#define MD_CLUSTER_WAITING_FOR_NEWDISK 1
+#define MD_CLUSTER_SUSPEND_READ_BALANCING 2
struct md_cluster_info {
@@ -275,6 +276,9 @@ clear_bit:
static void recover_prep(void *arg)
{
+ struct mddev *mddev = arg;
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+ set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
}
static void recover_slot(void *arg, struct dlm_slot *slot)
@@ -307,6 +311,7 @@ static void recover_done(void *arg, struct dlm_slot *slots,
cinfo->slot_number = our_slot;
complete(&cinfo->completion);
+ clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
}
static const struct dlm_lockspace_ops md_ls_ops = {
@@ -816,12 +821,17 @@ static void resync_finish(struct mddev *mddev)
resync_send(mddev, RESYNCING, 0, 0);
}
-static int area_resyncing(struct mddev *mddev, sector_t lo, sector_t hi)
+static int area_resyncing(struct mddev *mddev, int direction,
+ sector_t lo, sector_t hi)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
int ret = 0;
struct suspend_info *s;
+ if ((direction == READ) &&
+ test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state))
+ return 1;
+
spin_lock_irq(&cinfo->suspend_lock);
if (list_empty(&cinfo->suspend_list))
goto out;