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md/raid10: Make use of new recovery_disabled handling

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When we get a read error during recovery, RAID10 previously
arranged for the recovering device to appear to fail so that
the recovery stops and doesn't restart.  This is misleading and wrong.

Instead, make use of the new recovery_disabled handling and mark
the target device and having recovery disabled.

Add appropriate checks in add_disk and remove_disk so that devices
are removed and not re-added when recovery is disabled.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2011-07-27 11:00:36 +10:00
parent 5389042ffa
commit 2bb77736ae
2 changed files with 41 additions and 26 deletions
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62
drivers/md/raid10.c
View File

@ -1099,7 +1099,6 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
conf_t *conf = mddev->private;
int err = -EEXIST;
int mirror;
mirror_info_t *p;
int first = 0;
int last = conf->raid_disks - 1;
@ -1119,32 +1118,36 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
mirror = rdev->saved_raid_disk;
else
mirror = first;
for ( ; mirror <= last ; mirror++)
if ( !(p=conf->mirrors+mirror)->rdev) {
for ( ; mirror <= last ; mirror++) {
mirror_info_t *p = &conf->mirrors[mirror];
if (p->recovery_disabled == mddev->recovery_disabled)
continue;
if (!p->rdev)
continue;
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
/* as we don't honour merge_bvec_fn, we must
* never risk violating it, so limit
* ->max_segments to one lying with a single
* page, as a one page request is never in
* violation.
*/
if (rdev->bdev->bd_disk->queue->merge_bvec_fn) {
blk_queue_max_segments(mddev->queue, 1);
blk_queue_segment_boundary(mddev->queue,
PAGE_CACHE_SIZE - 1);
}
p->head_position = 0;
rdev->raid_disk = mirror;
err = 0;
if (rdev->saved_raid_disk != mirror)
conf->fullsync = 1;
rcu_assign_pointer(p->rdev, rdev);
break;
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
/* as we don't honour merge_bvec_fn, we must
* never risk violating it, so limit
* ->max_segments to one lying with a single
* page, as a one page request is never in
* violation.
*/
if (rdev->bdev->bd_disk->queue->merge_bvec_fn) {
blk_queue_max_segments(mddev->queue, 1);
blk_queue_segment_boundary(mddev->queue,
PAGE_CACHE_SIZE - 1);
}
p->head_position = 0;
rdev->raid_disk = mirror;
err = 0;
if (rdev->saved_raid_disk != mirror)
conf->fullsync = 1;
rcu_assign_pointer(p->rdev, rdev);
break;
}
md_integrity_add_rdev(rdev, mddev);
print_conf(conf);
return err;
@ -1169,6 +1172,7 @@ static int raid10_remove_disk(mddev_t *mddev, int number)
* is not possible.
*/
if (!test_bit(Faulty, &rdev->flags) &&
mddev->recovery_disabled != p->recovery_disabled &&
enough(conf)) {
err = -EBUSY;
goto abort;
@ -1383,8 +1387,14 @@ static void recovery_request_write(mddev_t *mddev, r10bio_t *r10_bio)
md_sync_acct(conf->mirrors[d].rdev->bdev, wbio->bi_size >> 9);
if (test_bit(R10BIO_Uptodate, &r10_bio->state))
generic_make_request(wbio);
else
bio_endio(wbio, -EIO);
else {
printk(KERN_NOTICE
"md/raid10:%s: recovery aborted due to read error\n",
mdname(mddev));
conf->mirrors[d].recovery_disabled = mddev->recovery_disabled;
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
bio_endio(wbio, 0);
}
}

5
drivers/md/raid10.h
View File

@ -6,6 +6,11 @@ typedef struct mirror_info mirror_info_t;
struct mirror_info {
mdk_rdev_t *rdev;
sector_t head_position;
int recovery_disabled; /* matches
* mddev->recovery_disabled
* when we shouldn't try
* recovering this device.
*/
};
typedef struct r10bio_s r10bio_t;