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Suspend writes in RAID1 if within range

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If there is a resync going on, all nodes must suspend writes to the
range. This is recorded in the suspend_info/suspend_list.

If there is an I/O within the ranges of any of the suspend_info,
should_suspend will return 1.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
This commit is contained in:
Goldwyn Rodrigues 2014-06-07 02:39:37 -05:00
parent e59721ccdc
commit 589a1c4916
4 changed files with 30 additions and 3 deletions
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20
drivers/md/md-cluster.c
View File

@ -723,6 +723,25 @@ 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)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
int ret = 0;
struct suspend_info *s;
spin_lock_irq(&cinfo->suspend_lock);
if (list_empty(&cinfo->suspend_list))
goto out;
list_for_each_entry(s, &cinfo->suspend_list, list)
if (hi > s->lo && lo < s->hi) {
ret = 1;
break;
}
out:
spin_unlock_irq(&cinfo->suspend_lock);
return ret;
}
static struct md_cluster_operations cluster_ops = {
.join = join,
.leave = leave,
@ -733,6 +752,7 @@ static struct md_cluster_operations cluster_ops = {
.metadata_update_start = metadata_update_start,
.metadata_update_finish = metadata_update_finish,
.metadata_update_cancel = metadata_update_cancel,
.area_resyncing = area_resyncing,
};
static int __init cluster_init(void)

1
drivers/md/md-cluster.h
View File

@ -17,6 +17,7 @@ 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);
};
#endif /* _MD_CLUSTER_H */

1
drivers/md/md.c
View File

@ -68,6 +68,7 @@ static LIST_HEAD(pers_list);
static DEFINE_SPINLOCK(pers_lock);
struct md_cluster_operations *md_cluster_ops;
EXPORT_SYMBOL(md_cluster_ops);
struct module *md_cluster_mod;
EXPORT_SYMBOL(md_cluster_mod);

11
drivers/md/raid1.c
View File

@ -1101,8 +1101,10 @@ static void make_request(struct mddev *mddev, struct bio * bio)
md_write_start(mddev, bio); /* wait on superblock update early */
if (bio_data_dir(bio) == WRITE &&
bio_end_sector(bio) > mddev->suspend_lo &&
bio->bi_iter.bi_sector < mddev->suspend_hi) {
((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))))) {
/* As the suspend_* range is controlled by
* userspace, we want an interruptible
* wait.
@ -1113,7 +1115,10 @@ static void make_request(struct mddev *mddev, struct bio * bio)
prepare_to_wait(&conf->wait_barrier,
&w, TASK_INTERRUPTIBLE);
if (bio_end_sector(bio) <= mddev->suspend_lo ||
bio->bi_iter.bi_sector >= mddev->suspend_hi)
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))))
break;
schedule();
}