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>

diff --git a/fs/bio.c b/fs/bio.c
index 8b1f5ee..3cba7ae 100644 (file)
--- 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;
        }