diff options
| author | Christoph Hellwig <hch@lst.de> | 2017-06-03 10:37:57 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-06-09 18:27:32 +0300 |
| commit | 9966afaf91b37e8c3d106379eeae0afa91c68aa8 (patch) | |
| tree | a5d06e2c647e3e74c2238f20270512e7bdd50ec6 | |
| parent | f729b66fca43d850d564b264c2033980c00a14b0 (diff) | |
| download | linux-9966afaf91b37e8c3d106379eeae0afa91c68aa8.tar.xz | |
dm: fix REQ_RAHEAD handling
A few (but not all) dm targets use a special EWOULDBLOCK error code for
failing REQ_RAHEAD requests that fail due to a lack of available resources.
But no one else knows about this magic code, and lower level drivers also
don't generate it when failing read-ahead requests for similar reasons.
So remove this special casing and ignore all additional error handling for
REQ_RAHEAD - if this was a real underlying error we'd get a normal read
once the real read comes in.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <Bart.VanAssche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | drivers/md/dm-raid1.c | 4 | ||||
| -rw-r--r-- | drivers/md/dm-stripe.c | 2 |
2 files changed, 3 insertions, 3 deletions
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c index a95cbb80fb34..5e30b08b91d9 100644 --- a/drivers/md/dm-raid1.c +++ b/drivers/md/dm-raid1.c @@ -1214,7 +1214,7 @@ static int mirror_map(struct dm_target *ti, struct bio *bio) */ if (!r || (r == -EWOULDBLOCK)) { if (bio->bi_opf & REQ_RAHEAD) - return -EWOULDBLOCK; + return -EIO; queue_bio(ms, bio, rw); return DM_MAPIO_SUBMITTED; @@ -1258,7 +1258,7 @@ static int mirror_end_io(struct dm_target *ti, struct bio *bio, int error) if (error == -EOPNOTSUPP) return error; - if ((error == -EWOULDBLOCK) && (bio->bi_opf & REQ_RAHEAD)) + if (bio->bi_opf & REQ_RAHEAD) return error; if (unlikely(error)) { diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c index 75152482f3ad..780e95889a7c 100644 --- a/drivers/md/dm-stripe.c +++ b/drivers/md/dm-stripe.c @@ -384,7 +384,7 @@ static int stripe_end_io(struct dm_target *ti, struct bio *bio, int error) if (!error) return 0; /* I/O complete */ - if ((error == -EWOULDBLOCK) && (bio->bi_opf & REQ_RAHEAD)) + if (bio->bi_opf & REQ_RAHEAD) return error; if (error == -EOPNOTSUPP) |