Commit 589a1c49 authored by Goldwyn Rodrigues's avatar Goldwyn Rodrigues
Browse files

Suspend writes in RAID1 if within range 



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: default avatarGoldwyn Rodrigues <rgoldwyn@suse.com>
parent e59721cc

drivers/md/md-cluster.c

+20 −0
Original line number Diff line number Diff line
@@ -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)

drivers/md/md-cluster.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */

drivers/md/md.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

drivers/md/raid1.c

+8 −3
Original line number Diff line number Diff line
@@ -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();

		}

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