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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-08-25 20:36:08 +0200
committerJens Axboe <jens.axboe@oracle.com>2008-08-27 09:50:19 +0200
commitaefcc28a3a63ac33a298777aa50ba43641c75241 (patch)
treed72a23323e80b45da16ea916c9abe03d6a3f6bfd
parent76029ff37f31dad64641489c610d98955217bb68 (diff)
bio: fix __bio_copy_iov() handling of bio->bv_len
The commit c5dec1c3034f1ae3503efbf641ff3b0273b64797 introduced __bio_copy_iov() to add bounce support to blk_rq_map_user_iov. __bio_copy_iov() uses bio->bv_len to copy data for READ commands after the completion but it doesn't work with a request that partially completed. SCSI always completes a PC request as a whole but seems some don't. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: stable@kernel.org Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
-rw-r--r--fs/bio.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/bio.c b/fs/bio.c
index 8b1f5ee6f83..3cba7ae34d7 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -492,8 +492,8 @@ static struct bio_map_data *bio_alloc_map_data(int nr_segs, int iov_count,
return NULL;
}
-static int __bio_copy_iov(struct bio *bio, struct sg_iovec *iov, int iov_count,
- int uncopy)
+static int __bio_copy_iov(struct bio *bio, struct bio_vec *iovecs,
+ struct sg_iovec *iov, int iov_count, int uncopy)
{
int ret = 0, i;
struct bio_vec *bvec;
@@ -503,7 +503,7 @@ static int __bio_copy_iov(struct bio *bio, struct sg_iovec *iov, int iov_count,
__bio_for_each_segment(bvec, bio, i, 0) {
char *bv_addr = page_address(bvec->bv_page);
- unsigned int bv_len = bvec->bv_len;
+ unsigned int bv_len = iovecs[i].bv_len;
while (bv_len && iov_idx < iov_count) {
unsigned int bytes;
@@ -555,7 +555,7 @@ int bio_uncopy_user(struct bio *bio)
struct bio_map_data *bmd = bio->bi_private;
int ret;
- ret = __bio_copy_iov(bio, bmd->sgvecs, bmd->nr_sgvecs, 1);
+ ret = __bio_copy_iov(bio, bmd->iovecs, bmd->sgvecs, bmd->nr_sgvecs, 1);
bio_free_map_data(bmd);
bio_put(bio);
@@ -634,7 +634,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q, struct sg_iovec *iov,
* success
*/
if (!write_to_vm) {
- ret = __bio_copy_iov(bio, iov, iov_count, 0);
+ ret = __bio_copy_iov(bio, bio->bi_io_vec, iov, iov_count, 0);
if (ret)
goto cleanup;
}