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md/raid10: Split handle_read_error out from raid10d.

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raid10d() is too big and is about to get bigger, so split
handle_read_error() out as a separate function.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2011-07-28 11:39:23 +10:00
parent 1294b9c973
commit 560f8e5532
1 changed files with 65 additions and 56 deletions
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121
drivers/md/raid10.c
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@ -1618,21 +1618,81 @@ static void fix_read_error(conf_t *conf, mddev_t *mddev, r10bio_t *r10_bio)
}
}
static void handle_read_error(mddev_t *mddev, r10bio_t *r10_bio)
{
int slot = r10_bio->read_slot;
int mirror = r10_bio->devs[slot].devnum;
struct bio *bio;
conf_t *conf = mddev->private;
mdk_rdev_t *rdev;
char b[BDEVNAME_SIZE];
unsigned long do_sync;
/* we got a read error. Maybe the drive is bad. Maybe just
* the block and we can fix it.
* We freeze all other IO, and try reading the block from
* other devices. When we find one, we re-write
* and check it that fixes the read error.
* This is all done synchronously while the array is
* frozen.
*/
if (mddev->ro == 0) {
freeze_array(conf);
fix_read_error(conf, mddev, r10_bio);
unfreeze_array(conf);
}
rdev_dec_pending(conf->mirrors[mirror].rdev, mddev);
bio = r10_bio->devs[slot].bio;
r10_bio->devs[slot].bio =
mddev->ro ? IO_BLOCKED : NULL;
mirror = read_balance(conf, r10_bio);
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),
(unsigned long long)r10_bio->sector);
raid_end_bio_io(r10_bio);
bio_put(bio);
return;
}
do_sync = (r10_bio->master_bio->bi_rw & REQ_SYNC);
bio_put(bio);
slot = r10_bio->read_slot;
rdev = conf->mirrors[mirror].rdev;
printk_ratelimited(
KERN_ERR
"md/raid10:%s: %s: redirecting"
"sector %llu to another mirror\n",
mdname(mddev),
bdevname(rdev->bdev, b),
(unsigned long long)r10_bio->sector);
bio = bio_clone_mddev(r10_bio->master_bio,
GFP_NOIO, mddev);
r10_bio->devs[slot].bio = bio;
bio->bi_sector = r10_bio->devs[slot].addr
+ rdev->data_offset;
bio->bi_bdev = rdev->bdev;
bio->bi_rw = READ | do_sync;
bio->bi_private = r10_bio;
bio->bi_end_io = raid10_end_read_request;
generic_make_request(bio);
}
static void raid10d(mddev_t *mddev)
{
r10bio_t *r10_bio;
struct bio *bio;
unsigned long flags;
conf_t *conf = mddev->private;
struct list_head *head = &conf->retry_list;
mdk_rdev_t *rdev;
struct blk_plug plug;
md_check_recovery(mddev);
blk_start_plug(&plug);
for (;;) {
char b[BDEVNAME_SIZE];
flush_pending_writes(conf);
@ -1652,60 +1712,9 @@ static void raid10d(mddev_t *mddev)
sync_request_write(mddev, r10_bio);
else if (test_bit(R10BIO_IsRecover, &r10_bio->state))
recovery_request_write(mddev, r10_bio);
else {
int slot = r10_bio->read_slot;
int mirror = r10_bio->devs[slot].devnum;
/* we got a read error. Maybe the drive is bad. Maybe just
* the block and we can fix it.
* We freeze all other IO, and try reading the block from
* other devices. When we find one, we re-write
* and check it that fixes the read error.
* This is all done synchronously while the array is
* frozen.
*/
if (mddev->ro == 0) {
freeze_array(conf);
fix_read_error(conf, mddev, r10_bio);
unfreeze_array(conf);
}
rdev_dec_pending(conf->mirrors[mirror].rdev, mddev);
else
handle_read_error(mddev, r10_bio);
bio = r10_bio->devs[slot].bio;
r10_bio->devs[slot].bio =
mddev->ro ? IO_BLOCKED : NULL;
mirror = read_balance(conf, r10_bio);
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),
(unsigned long long)r10_bio->sector);
raid_end_bio_io(r10_bio);
bio_put(bio);
} else {
const unsigned long do_sync = (r10_bio->master_bio->bi_rw & REQ_SYNC);
bio_put(bio);
slot = r10_bio->read_slot;
rdev = conf->mirrors[mirror].rdev;
printk_ratelimited(
KERN_ERR
"md/raid10:%s: %s: redirecting"
"sector %llu to another mirror\n",
mdname(mddev),
bdevname(rdev->bdev, b),
(unsigned long long)r10_bio->sector);
bio = bio_clone_mddev(r10_bio->master_bio,
GFP_NOIO, mddev);
r10_bio->devs[slot].bio = bio;
bio->bi_sector = r10_bio->devs[slot].addr
+ rdev->data_offset;
bio->bi_bdev = rdev->bdev;
bio->bi_rw = READ | do_sync;
bio->bi_private = r10_bio;
bio->bi_end_io = raid10_end_read_request;
generic_make_request(bio);
}
}
cond_resched();
if (mddev->flags & ~(1<<MD_CHANGE_PENDING))
md_check_recovery(mddev);