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authorChristoph Hellwig <hch@infradead.org>2012-06-17 18:40:54 -0400
committerNicholas Bellinger <nab@linux-iscsi.org>2012-07-16 17:34:41 -0700
commit6f974e8ce7b3f661910a49c7c2ba095631f341e9 (patch)
tree5698f1ed849b92eec547571594a68183c592b590 /drivers/target/target_core_sbc.c
parentad67f0d9e63ca94661e06a145f05a9302368a826 (diff)
target: move write_same to struct spc_ops
Add spc_ops->execute_write_same() caller for ->execute_cmd() setup, and update IBLOCK backends to use it. (nab: add export of spc_get_write_same_sectors symbol) (roland: Carry forward: Fix range calculation in WRITE SAME emulation when num blocks == 0) Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_sbc.c')
-rw-r--r--drivers/target/target_core_sbc.c52
1 files changed, 18 insertions, 34 deletions
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 377c5105e27..146ca372489 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -156,24 +156,9 @@ err:
return ret;
}
-/*
- * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
- * Note this is not used for TCM/pSCSI passthrough
- */
-static int sbc_emulate_write_same(struct se_cmd *cmd)
+int spc_get_write_same_sectors(struct se_cmd *cmd)
{
- struct se_device *dev = cmd->se_dev;
- sector_t range;
- sector_t lba = cmd->t_task_lba;
u32 num_blocks;
- int ret;
-
- if (!dev->transport->do_discard) {
- pr_err("WRITE_SAME emulation not supported"
- " for: %s\n", dev->transport->name);
- cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
- return -ENOSYS;
- }
if (cmd->t_task_cdb[0] == WRITE_SAME)
num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
@@ -186,23 +171,13 @@ static int sbc_emulate_write_same(struct se_cmd *cmd)
* Use the explicit range when non zero is supplied, otherwise calculate
* the remaining range based on ->get_blocks() - starting LBA.
*/
- if (num_blocks != 0)
- range = num_blocks;
- else
- range = (dev->transport->get_blocks(dev) - lba) + 1;
+ if (num_blocks)
+ return num_blocks;
- pr_debug("WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
- (unsigned long long)lba, (unsigned long long)range);
-
- ret = dev->transport->do_discard(dev, lba, range);
- if (ret < 0) {
- pr_debug("blkdev_issue_discard() failed for WRITE_SAME\n");
- return ret;
- }
-
- target_complete_cmd(cmd, GOOD);
- return 0;
+ return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
+ cmd->t_task_lba + 1;
}
+EXPORT_SYMBOL(spc_get_write_same_sectors);
static int sbc_emulate_verify(struct se_cmd *cmd)
{
@@ -488,6 +463,9 @@ int sbc_parse_cdb(struct se_cmd *cmd, struct spc_ops *ops)
cmd->se_cmd_flags |= SCF_FUA;
break;
case WRITE_SAME_32:
+ if (!ops->execute_write_same)
+ goto out_unsupported_cdb;
+
sectors = transport_get_sectors_32(cdb);
if (!sectors) {
pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
@@ -500,7 +478,7 @@ int sbc_parse_cdb(struct se_cmd *cmd, struct spc_ops *ops)
if (sbc_write_same_supported(dev, &cdb[10]) < 0)
goto out_unsupported_cdb;
- cmd->execute_cmd = sbc_emulate_write_same;
+ cmd->execute_cmd = ops->execute_write_same;
break;
default:
pr_err("VARIABLE_LENGTH_CMD service action"
@@ -559,6 +537,9 @@ int sbc_parse_cdb(struct se_cmd *cmd, struct spc_ops *ops)
cmd->execute_cmd = sbc_emulate_unmap;
break;
case WRITE_SAME_16:
+ if (!ops->execute_write_same)
+ goto out_unsupported_cdb;
+
sectors = transport_get_sectors_16(cdb);
if (!sectors) {
pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
@@ -570,9 +551,12 @@ int sbc_parse_cdb(struct se_cmd *cmd, struct spc_ops *ops)
if (sbc_write_same_supported(dev, &cdb[1]) < 0)
goto out_unsupported_cdb;
- cmd->execute_cmd = sbc_emulate_write_same;
+ cmd->execute_cmd = ops->execute_write_same;
break;
case WRITE_SAME:
+ if (!ops->execute_write_same)
+ goto out_unsupported_cdb;
+
sectors = transport_get_sectors_10(cdb);
if (!sectors) {
pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
@@ -588,7 +572,7 @@ int sbc_parse_cdb(struct se_cmd *cmd, struct spc_ops *ops)
*/
if (sbc_write_same_supported(dev, &cdb[1]) < 0)
goto out_unsupported_cdb;
- cmd->execute_cmd = sbc_emulate_write_same;
+ cmd->execute_cmd = ops->execute_write_same;
break;
case VERIFY:
size = 0;