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authorNeilBrown <neilb@suse.de>2011-07-28 11:39:23 +1000
committerNeilBrown <neilb@suse.de>2011-07-28 11:39:23 +1000
commit7399c31bc92a26bb8388a73f8e14acadcc512fe5 (patch)
tree0f1d9904fde1d5258c84643a26947288251b9776
parent856e08e23762dfb92ffc68fd0a8d228f9e152160 (diff)
md/raid10: avoid reading from known bad blocks - part 2
When redirecting a read error to a different device, we must again avoid bad blocks and possibly split the request. Spin_lock typo fixed thanks to Dan Carpenter <error27@gmail.com> Signed-off-by: NeilBrown <neilb@suse.de>
-rw-r--r--drivers/md/raid10.c45
1 files changed, 40 insertions, 5 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 872bf948f33a..37801d68a4cd 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1746,14 +1746,15 @@ static void handle_read_error(mddev_t *mddev, r10bio_t *r10_bio)
rdev_dec_pending(conf->mirrors[mirror].rdev, mddev);
bio = r10_bio->devs[slot].bio;
+ bdevname(bio->bi_bdev, b);
r10_bio->devs[slot].bio =
mddev->ro ? IO_BLOCKED : NULL;
+read_more:
mirror = read_balance(conf, r10_bio, &max_sectors);
- if (mirror == -1 || max_sectors < r10_bio->sectors) {
+ if (mirror == -1) {
printk(KERN_ALERT "md/raid10:%s: %s: unrecoverable I/O"
" read error for block %llu\n",
- mdname(mddev),
- bdevname(bio->bi_bdev, b),
+ mdname(mddev), b,
(unsigned long long)r10_bio->sector);
raid_end_bio_io(r10_bio);
bio_put(bio);
@@ -1761,7 +1762,8 @@ static void handle_read_error(mddev_t *mddev, r10bio_t *r10_bio)
}
do_sync = (r10_bio->master_bio->bi_rw & REQ_SYNC);
- bio_put(bio);
+ if (bio)
+ bio_put(bio);
slot = r10_bio->read_slot;
rdev = conf->mirrors[mirror].rdev;
printk_ratelimited(
@@ -1773,6 +1775,9 @@ static void handle_read_error(mddev_t *mddev, r10bio_t *r10_bio)
(unsigned long long)r10_bio->sector);
bio = bio_clone_mddev(r10_bio->master_bio,
GFP_NOIO, mddev);
+ md_trim_bio(bio,
+ r10_bio->sector - bio->bi_sector,
+ max_sectors);
r10_bio->devs[slot].bio = bio;
bio->bi_sector = r10_bio->devs[slot].addr
+ rdev->data_offset;
@@ -1780,7 +1785,37 @@ static void handle_read_error(mddev_t *mddev, r10bio_t *r10_bio)
bio->bi_rw = READ | do_sync;
bio->bi_private = r10_bio;
bio->bi_end_io = raid10_end_read_request;
- generic_make_request(bio);
+ if (max_sectors < r10_bio->sectors) {
+ /* Drat - have to split this up more */
+ struct bio *mbio = r10_bio->master_bio;
+ int sectors_handled =
+ r10_bio->sector + max_sectors
+ - mbio->bi_sector;
+ r10_bio->sectors = max_sectors;
+ spin_lock_irq(&conf->device_lock);
+ if (mbio->bi_phys_segments == 0)
+ mbio->bi_phys_segments = 2;
+ else
+ mbio->bi_phys_segments++;
+ spin_unlock_irq(&conf->device_lock);
+ generic_make_request(bio);
+ bio = NULL;
+
+ r10_bio = mempool_alloc(conf->r10bio_pool,
+ GFP_NOIO);
+ r10_bio->master_bio = mbio;
+ r10_bio->sectors = (mbio->bi_size >> 9)
+ - sectors_handled;
+ r10_bio->state = 0;
+ set_bit(R10BIO_ReadError,
+ &r10_bio->state);
+ r10_bio->mddev = mddev;
+ r10_bio->sector = mbio->bi_sector
+ + sectors_handled;
+
+ goto read_more;
+ } else
+ generic_make_request(bio);
}
static void raid10d(mddev_t *mddev)