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target: Add return for se_cmd->transport_complete_callback

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This patch adds a sense_reason_t return to ->transport_complete_callback(),
and updates target_complete_ok_work() to invoke the call if necessary to
transport_send_check_condition_and_sense() during the failure case.

Also update xdreadwrite_callback() to use this return value.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: James Bottomley <JBottomley@Parallels.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Nicholas Bellinger <nab@daterainc.com>
This commit is contained in:
Nicholas Bellinger 2013-08-19 14:34:17 -07:00 committed by Nicholas Bellinger
parent 1c68cc1626
commit a6b0133c19
3 changed files with 26 additions and 9 deletions
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13
drivers/target/target_core_sbc.c
View File

@ -280,13 +280,13 @@ sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *o
return 0;
}
static void xdreadwrite_callback(struct se_cmd *cmd)
static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd)
{
unsigned char *buf, *addr;
struct scatterlist *sg;
unsigned int offset;
int i;
int count;
sense_reason_t ret = TCM_NO_SENSE;
int i, count;
/*
* From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
*
@ -301,7 +301,7 @@ static void xdreadwrite_callback(struct se_cmd *cmd)
buf = kmalloc(cmd->data_length, GFP_KERNEL);
if (!buf) {
pr_err("Unable to allocate xor_callback buf\n");
return;
return TCM_OUT_OF_RESOURCES;
}
/*
* Copy the scatterlist WRITE buffer located at cmd->t_data_sg
@ -320,8 +320,10 @@ static void xdreadwrite_callback(struct se_cmd *cmd)
offset = 0;
for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
addr = kmap_atomic(sg_page(sg));
if (!addr)
if (!addr) {
ret = TCM_OUT_OF_RESOURCES;
goto out;
}
for (i = 0; i < sg->length; i++)
*(addr + sg->offset + i) ^= *(buf + offset + i);
@ -332,6 +334,7 @@ static void xdreadwrite_callback(struct se_cmd *cmd)
out:
kfree(buf);
return ret;
}
sense_reason_t

20
drivers/target/target_core_transport.c
View File

@ -1904,10 +1904,24 @@ static void target_complete_ok_work(struct work_struct *work)
}
/*
* Check for a callback, used by amongst other things
* XDWRITE_READ_10 emulation.
* XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
*/
if (cmd->transport_complete_callback)
cmd->transport_complete_callback(cmd);
if (cmd->transport_complete_callback) {
sense_reason_t rc;
rc = cmd->transport_complete_callback(cmd);
if (!rc)
return;
ret = transport_send_check_condition_and_sense(cmd,
rc, 0);
if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
transport_lun_remove_cmd(cmd);
transport_cmd_check_stop_to_fabric(cmd);
return;
}
switch (cmd->data_direction) {
case DMA_FROM_DEVICE:

2
include/target/target_core_base.h
View File

@ -447,7 +447,7 @@ struct se_cmd {
struct kref cmd_kref;
struct target_core_fabric_ops *se_tfo;
sense_reason_t (*execute_cmd)(struct se_cmd *);
void (*transport_complete_callback)(struct se_cmd *);
sense_reason_t (*transport_complete_callback)(struct se_cmd *);
unsigned char *t_task_cdb;
unsigned char __t_task_cdb[TCM_MAX_COMMAND_SIZE];