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path: root/drivers/md/raid10.c
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Diffstat (limited to 'drivers/md/raid10.c')
-rw-r--r--drivers/md/raid10.c46
1 files changed, 41 insertions, 5 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 62ebb1bc72b..5bd1e9ec899 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -538,7 +538,8 @@ static int read_balance(conf_t *conf, r10bio_t *r10_bio)
}
- current_distance = abs(this_sector - conf->mirrors[disk].head_position);
+ current_distance = abs(r10_bio->devs[slot].addr -
+ conf->mirrors[disk].head_position);
/* Find the disk whose head is closest */
@@ -668,6 +669,11 @@ static int make_request(request_queue_t *q, struct bio * bio)
int i;
int chunk_sects = conf->chunk_mask + 1;
+ if (unlikely(bio_barrier(bio))) {
+ bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+ return 0;
+ }
+
/* If this request crosses a chunk boundary, we need to
* split it. This will only happen for 1 PAGE (or less) requests.
*/
@@ -900,6 +906,27 @@ static void close_sync(conf_t *conf)
conf->r10buf_pool = NULL;
}
+/* check if there are enough drives for
+ * every block to appear on atleast one
+ */
+static int enough(conf_t *conf)
+{
+ int first = 0;
+
+ do {
+ int n = conf->copies;
+ int cnt = 0;
+ while (n--) {
+ if (conf->mirrors[first].rdev)
+ cnt++;
+ first = (first+1) % conf->raid_disks;
+ }
+ if (cnt == 0)
+ return 0;
+ } while (first != 0);
+ return 1;
+}
+
static int raid10_spare_active(mddev_t *mddev)
{
int i;
@@ -938,6 +965,8 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
* very different from resync
*/
return 0;
+ if (!enough(conf))
+ return 0;
for (mirror=0; mirror < mddev->raid_disks; mirror++)
if ( !(p=conf->mirrors+mirror)->rdev) {
@@ -1445,7 +1474,13 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
}
}
if (j == conf->copies) {
- BUG();
+ /* Cannot recover, so abort the recovery */
+ put_buf(r10_bio);
+ r10_bio = rb2;
+ if (!test_and_set_bit(MD_RECOVERY_ERR, &mddev->recovery))
+ printk(KERN_INFO "raid10: %s: insufficient working devices for recovery.\n",
+ mdname(mddev));
+ break;
}
}
if (biolist == NULL) {
@@ -1678,9 +1713,10 @@ static int run(mddev_t *mddev)
init_waitqueue_head(&conf->wait_idle);
init_waitqueue_head(&conf->wait_resume);
- if (!conf->working_disks) {
- printk(KERN_ERR "raid10: no operational mirrors for %s\n",
- mdname(mddev));
+ /* need to check that every block has at least one working mirror */
+ if (!enough(conf)) {
+ printk(KERN_ERR "raid10: not enough operational mirrors for %s\n",
+ mdname(mddev));
goto out_free_conf;
}