bio: fix bio_copy_kern() handling of bio->bv_len

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The commit 68154e90c9 introduced
bio_copy_kern() to add bounce support to blk_rq_map_kern.

bio_copy_kern() 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.

This patch fixes bio_copy_kern to handle the above case. As
bio_copy_user does, bio_copy_kern uses struct bio_map_data to store
struct bio_vec.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Reported-by: Nix <nix@esperi.org.uk>
Tested-by: Nix <nix@esperi.org.uk>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

...

This commit is contained in:

FUJITA Tomonori 2008-08-25 20:36:08 +02:00 • committed by Jens Axboe

parent 48fd4f93a0

commit 76029ff37f

1 changed files with 28 additions and 10 deletions

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fs/bio.c

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