On Wed, 2008-03-05 at 12:16 +0200, Boaz Harrosh wrote:
> Please test it solves the CD burning problem.
Works for me.
-Mike
> (The patch includes the revert of commit e97a294e)
> ---
> From: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
> Date: Wed, 5 Mar 2008 12:07:12 +0200
> Subject: [PATCH] blk: missing add of padded bytes to io completion byte count
>
> the commit e97a294ef6938512b655b1abf17656cf2b26f709 was very wrong. This is
> because scsi-ml supports the ability to split a request into smaller chunks,
> in which case scsi_bufflen() is smaller then request length. Then at completion
> time the remainder can be issued as a new scsi command. In that case the above
> commit is a data corruption.
>
> Also in this fix all users of block layer are taken care of, and not only
> scsi devices.
>
> Signed-off-by: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
> Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
> ---
> block/blk-core.c | 4 ++++
> drivers/scsi/scsi.c | 2 +-
> 2 files changed, 5 insertions(+), 1 deletions(-)
>
> diff --git a/block/blk-core.c b/block/blk-core.c
> index 2a438a9..37fcccc 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -1549,6 +1549,9 @@ static int __end_that_request_first(struct request *req, int error,
> nr_bytes >> 9, req->sector);
> }
>
> + if (nr_bytes >= blk_rq_bytes(req))
> + nr_bytes += req->extra_len;
> +
> total_bytes = bio_nbytes = 0;
> while ((bio = req->bio) != NULL) {
> int nbytes;
> @@ -1616,6 +1619,7 @@ static int __end_that_request_first(struct request *req, int error,
> if (!req->bio)
> return 0;
>
> + BUG_ON(total_bytes >= blk_rq_bytes(req));
> /*
> * if the request wasn't completed, update state
> */
> diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
> index e5c6f6a..fecba05 100644
> --- a/drivers/scsi/scsi.c
> +++ b/drivers/scsi/scsi.c
> @@ -757,7 +757,7 @@ void scsi_finish_command(struct scsi_cmnd *cmd)
> "Notifying upper driver of completion "
> "(result %x)\n", cmd->result));
>
> - good_bytes = scsi_bufflen(cmd) + cmd->request->extra_len;
> + good_bytes = scsi_bufflen(cmd);
> if (cmd->request->cmd_type != REQ_TYPE_BLOCK_PC) {
> drv = scsi_cmd_to_driver(cmd);
> if (drv->done)
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