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tcm_loop: Set residual field for SCSI commands

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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>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Roland Dreier 2012-02-14 15:30:31 -08:00 committed by Nicholas Bellinger
parent 015487b89f
commit 6cf3fa6918
1 changed files with 6 additions and 0 deletions
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6
drivers/target/loopback/tcm_loop.c
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@ -829,6 +829,9 @@ static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
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;
}
@ -854,6 +857,9 @@ static int tcm_loop_queue_status(struct se_cmd *se_cmd)
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;
}