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md/raid10: add failfast handling for writes. 

When writing to a fastfail device, we use MD_FASTFAIL unless
it is the only device being written to.  For
resync/recovery, assume there was a working device to read
from so always use MD_FASTFAIL.

If a write for resync/recovery fails, we just fail the
device - there is not much else to do.

If a normal write fails, but the device cannot be marked
Faulty (must be only one left), we queue for write error
handling which calls narrow_write_error() to write the block
synchronously without any failfast flags.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
NeilBrown 2016-11-18 16:16:12 +11:00 committed by Shaohua Li
parent 8d3ca83dcf
commit 1919cbb23b
1 changed files with 28 additions and 1 deletions
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29
drivers/md/raid10.c
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@ -100,6 +100,7 @@ static int max_queued_requests = 1024;
static void allow_barrier(struct r10conf *conf);
static void lower_barrier(struct r10conf *conf);
static int _enough(struct r10conf *conf, int previous, int ignore);
static int enough(struct r10conf *conf, int ignore);
static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr,
int *skipped);
static void reshape_request_write(struct mddev *mddev, struct r10bio *r10_bio);
@ -450,6 +451,7 @@ static void raid10_end_write_request(struct bio *bio)
struct r10conf *conf = r10_bio->mddev->private;
int slot, repl;
struct md_rdev *rdev = NULL;
struct bio *to_put = NULL;
bool discard_error;
discard_error = bio->bi_error && bio_op(bio) == REQ_OP_DISCARD;
@ -477,8 +479,24 @@ static void raid10_end_write_request(struct bio *bio)
if (!test_and_set_bit(WantReplacement, &rdev->flags))
set_bit(MD_RECOVERY_NEEDED,
&rdev->mddev->recovery);
set_bit(R10BIO_WriteError, &r10_bio->state);
dec_rdev = 0;
if (test_bit(FailFast, &rdev->flags) &&
(bio->bi_opf & MD_FAILFAST)) {
md_error(rdev->mddev, rdev);
if (!test_bit(Faulty, &rdev->flags))
/* This is the only remaining device,
* We need to retry the write without
* FailFast
*/
set_bit(R10BIO_WriteError, &r10_bio->state);
else {
r10_bio->devs[slot].bio = NULL;
to_put = bio;
dec_rdev = 1;
}
} else
set_bit(R10BIO_WriteError, &r10_bio->state);
}
} else {
/*
@ -528,6 +546,8 @@ static void raid10_end_write_request(struct bio *bio)
one_write_done(r10_bio);
if (dec_rdev)
rdev_dec_pending(rdev, conf->mddev);
if (to_put)
bio_put(to_put);
}
/*
@ -1390,6 +1410,9 @@ static void __make_request(struct mddev *mddev, struct bio *bio)
mbio->bi_bdev = rdev->bdev;
mbio->bi_end_io = raid10_end_write_request;
bio_set_op_attrs(mbio, op, do_sync | do_fua);
if (test_bit(FailFast, &conf->mirrors[d].rdev->flags) &&
enough(conf, d))
mbio->bi_opf |= MD_FAILFAST;
mbio->bi_private = r10_bio;
if (conf->mddev->gendisk)
@ -2052,6 +2075,8 @@ static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio)
atomic_inc(&r10_bio->remaining);
md_sync_acct(conf->mirrors[d].rdev->bdev, bio_sectors(tbio));
if (test_bit(FailFast, &conf->mirrors[d].rdev->flags))
tbio->bi_opf |= MD_FAILFAST;
tbio->bi_iter.bi_sector += conf->mirrors[d].rdev->data_offset;
tbio->bi_bdev = conf->mirrors[d].rdev->bdev;
generic_make_request(tbio);
@ -3341,6 +3366,8 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
bio->bi_private = r10_bio;
bio->bi_end_io = end_sync_write;
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
if (test_bit(FailFast, &conf->mirrors[d].rdev->flags))
bio->bi_opf |= MD_FAILFAST;
bio->bi_iter.bi_sector = sector + rdev->data_offset;
bio->bi_bdev = rdev->bdev;
count++;