diff options
| author | Nicholas Bellinger <nab@daterainc.com> | 2013-08-19 14:34:17 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2013-09-09 14:29:26 -0700 |
| commit | a6b0133c19af1ab268ed1f4414efa2782896a870 (patch) | |
| tree | ad55c8b08d283a8cf1fa2b3ae6d9a8b0b02b8677 /drivers/target | |
| parent | 1c68cc1626341665a8bd1d2c7dfffd7fc852a79c (diff) | |
| download | lwn-a6b0133c19af1ab268ed1f4414efa2782896a870.tar.gz lwn-a6b0133c19af1ab268ed1f4414efa2782896a870.zip | |
target: Add return for se_cmd->transport_complete_callback
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>
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/target_core_sbc.c | 13 | ||||
| -rw-r--r-- | drivers/target/target_core_transport.c | 20 |
2 files changed, 25 insertions, 8 deletions
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index 8a462773d0c8..be5234abb76c 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -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 diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 98ec7110873b..53d1d756f7f5 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -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: |