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Fix read-balancing during node failure

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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>
This commit is contained in:
Goldwyn Rodrigues 2015-06-24 09:30:32 -05:00 committed by NeilBrown
parent 33e38ac688
commit 90382ed9af
3 changed files with 16 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/md/md-cluster.c
View File

@ -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;

2
drivers/md/md-cluster.h
View File

@ -18,7 +18,7 @@ struct md_cluster_operations {
int (*metadata_update_start)(struct mddev *mddev);
int (*metadata_update_finish)(struct mddev *mddev);
int (*metadata_update_cancel)(struct mddev *mddev);
int (*area_resyncing)(struct mddev *mddev, sector_t lo, sector_t hi);
int (*area_resyncing)(struct mddev *mddev, int direction, sector_t lo, sector_t hi);
int (*add_new_disk_start)(struct mddev *mddev, struct md_rdev *rdev);
int (*add_new_disk_finish)(struct mddev *mddev);
int (*new_disk_ack)(struct mddev *mddev, bool ack);

7
drivers/md/raid1.c
View File

@ -541,7 +541,7 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect
if ((conf->mddev->recovery_cp < this_sector + sectors) ||
(mddev_is_clustered(conf->mddev) &&
md_cluster_ops->area_resyncing(conf->mddev, this_sector,
md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector,
this_sector + sectors)))
choose_first = 1;
else
@ -1111,7 +1111,8 @@ static void make_request(struct mddev *mddev, struct bio * bio)
((bio_end_sector(bio) > mddev->suspend_lo &&
bio->bi_iter.bi_sector < mddev->suspend_hi) ||
(mddev_is_clustered(mddev) &&
md_cluster_ops->area_resyncing(mddev, bio->bi_iter.bi_sector, bio_end_sector(bio))))) {
md_cluster_ops->area_resyncing(mddev, WRITE,
bio->bi_iter.bi_sector, bio_end_sector(bio))))) {
/* As the suspend_* range is controlled by
* userspace, we want an interruptible
* wait.
@ -1124,7 +1125,7 @@ static void make_request(struct mddev *mddev, struct bio * bio)
if (bio_end_sector(bio) <= mddev->suspend_lo ||
bio->bi_iter.bi_sector >= mddev->suspend_hi ||
(mddev_is_clustered(mddev) &&
!md_cluster_ops->area_resyncing(mddev,
!md_cluster_ops->area_resyncing(mddev, WRITE,
bio->bi_iter.bi_sector, bio_end_sector(bio))))
break;
schedule();