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[SCSI] tgt: fix sesnse buffer problems

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This patch simplify the way to notify LLDs of the command completion
and addresses the following sense buffer problems:

- can't handle both data and sense.
- forces user-space to use aligned sense buffer

tgt copies sense_data from userspace to cmnd->sense_buffer (if
necessary), maps user-space pages (if necessary) and then calls
host->transfer_response (host->transfer_data is removed).

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
FUJITA Tomonori
2007-03-03 09:55:54 +09:00
committed by James Bottomley
parent 181011e04a
commit bc7e380a6a
6 changed files with 45 additions and 134 deletions
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19
include/scsi/scsi_host.h
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@@ -129,6 +129,11 @@ struct scsi_host_template {
* the LLD. When the driver is finished processing the command
* the done callback is invoked.
*
* This is called to inform the LLD to transfer
* cmd->request_bufflen bytes. The cmd->use_sg speciefies the
* number of scatterlist entried in the command and
* cmd->request_buffer contains the scatterlist.
*
* return values: see queuecommand
*
* If the LLD accepts the cmd, it should set the result to an
@@ -139,20 +144,6 @@ struct scsi_host_template {
/* TODO: rename */
int (* transfer_response)(struct scsi_cmnd *,
void (*done)(struct scsi_cmnd *));
/*
* This is called to inform the LLD to transfer cmd->request_bufflen
* bytes of the cmd at cmd->offset in the cmd. The cmd->use_sg
* speciefies the number of scatterlist entried in the command
* and cmd->request_buffer contains the scatterlist.
*
* If the command cannot be processed in one transfer_data call
* becuase a scatterlist within the LLD's limits cannot be
* created then transfer_data will be called multiple times.
* It is initially called from process context, and later
* calls are from the interrup context.
*/
int (* transfer_data)(struct scsi_cmnd *,
void (*done)(struct scsi_cmnd *));
/* Used as callback for the completion of task management request. */
int (* tsk_mgmt_response)(u64 mid, int result);