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block: fix blk_rq_append_bio

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Commit caa4b02476e3(blk-map: call blk_queue_bounce from blk_rq_append_bio)
moves blk_queue_bounce() into blk_rq_append_bio(), but don't consider
the fact that the bounced bio becomes invisible to caller since the
parameter type is 'struct bio *'. Make it a pointer to a pointer to
a bio, so the caller sees the right bio also after a bounce.

Fixes: caa4b02476 ("blk-map: call blk_queue_bounce from blk_rq_append_bio")
Cc: Christoph Hellwig <[email protected]>
Reported-by: Michele Ballabio <[email protected]>
(handling failure of blk_rq_append_bio(), only call bio_get() after
blk_rq_append_bio() returns OK)
Tested-by: Michele Ballabio <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2017-12-18 15:40:44 +08:00
commit 0abc2a1038
4 changed files with 28 additions and 20 deletions
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38
block/blk-map.c
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@ -12,22 +12,29 @@
#include "blk.h"
/*
* Append a bio to a passthrough request. Only works can be merged into
* the request based on the driver constraints.
* Append a bio to a passthrough request. Only works if the bio can be merged
* into the request based on the driver constraints.
*/
int blk_rq_append_bio(struct request *rq, struct bio *bio)
int blk_rq_append_bio(struct request *rq, struct bio **bio)
{
blk_queue_bounce(rq->q, &bio);
struct bio *orig_bio = *bio;
blk_queue_bounce(rq->q, bio);
if (!rq->bio) {
blk_rq_bio_prep(rq->q, rq, bio);
blk_rq_bio_prep(rq->q, rq, *bio);
} else {
if (!ll_back_merge_fn(rq->q, rq, bio))
if (!ll_back_merge_fn(rq->q, rq, *bio)) {
if (orig_bio != *bio) {
bio_put(*bio);
*bio = orig_bio;
}
return -EINVAL;
}
rq->biotail->bi_next = bio;
rq->biotail = bio;
rq->__data_len += bio->bi_iter.bi_size;
rq->biotail->bi_next = *bio;
rq->biotail = *bio;
rq->__data_len += (*bio)->bi_iter.bi_size;
}
return 0;
@ -73,14 +80,12 @@ static int __blk_rq_map_user_iov(struct request *rq,
* We link the bounce buffer in and could have to traverse it
* later so we have to get a ref to prevent it from being freed
*/
ret = blk_rq_append_bio(rq, bio);
bio_get(bio);
ret = blk_rq_append_bio(rq, &bio);
if (ret) {
bio_endio(bio);
__blk_rq_unmap_user(orig_bio);
bio_put(bio);
return ret;
}
bio_get(bio);
return 0;
}
@ -213,7 +218,7 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
int reading = rq_data_dir(rq) == READ;
unsigned long addr = (unsigned long) kbuf;
int do_copy = 0;
struct bio *bio;
struct bio *bio, *orig_bio;
int ret;
if (len > (queue_max_hw_sectors(q) << 9))
@ -236,10 +241,11 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
if (do_copy)
rq->rq_flags |= RQF_COPY_USER;
ret = blk_rq_append_bio(rq, bio);
orig_bio = bio;
ret = blk_rq_append_bio(rq, &bio);
if (unlikely(ret)) {
/* request is too big */
bio_put(bio);
bio_put(orig_bio);
return ret;
}