| Date | Fri, 30 Mar 2012 12:49:35 -0700 | From | Greg KH <> | Subject | [ 062/149] tcm_loop: Set residual field for SCSI commands |
| |
3.2-stable review patch. If anyone has any objections, please let me know.
------------------
From: Roland Dreier <roland@purestorage.com>
commit 6cf3fa6918baab0c447f1206f1cef9166ad04864 upstream.
If the target core signals an over- or under-run, tcm_loop should call scsi_set_resid() to tell the SCSI midlayer about the residual data length.
The difference can be seen by doing something like
strace -eioctl sg_raw -r 1024 /dev/sda 8 0 0 0 1 0 > /dev/null
and looking at the "resid=" part of the SG_IO ioctl -- after this patch, the field is correctly reported as 512.
Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/target/loopback/tcm_loop.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/target/loopback/tcm_loop.c +++ b/drivers/target/loopback/tcm_loop.c @@ -866,6 +866,9 @@ static int tcm_loop_queue_data_in(struct sc->result = SAM_STAT_GOOD; set_host_byte(sc, DID_OK); + if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || + (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) + scsi_set_resid(sc, se_cmd->residual_count); sc->scsi_done(sc); return 0; } @@ -891,6 +894,9 @@ static int tcm_loop_queue_status(struct sc->result = se_cmd->scsi_status; set_host_byte(sc, DID_OK); + if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || + (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) + scsi_set_resid(sc, se_cmd->residual_count); sc->scsi_done(sc); return 0; }
|