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target: move write_same to struct spc_ops

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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>
This commit is contained in:
Christoph Hellwig 2012-06-17 18:40:54 -04:00 committed by Nicholas Bellinger
parent ad67f0d9e6
commit 6f974e8ce7
3 changed files with 38 additions and 34 deletions
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18
drivers/target/target_core_iblock.c
View file

@ -327,6 +327,23 @@ static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range)
return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier);
}
static int iblock_execute_write_same(struct se_cmd *cmd)
{
struct iblock_dev *ibd = cmd->se_dev->dev_ptr;
int ret;
ret = blkdev_issue_discard(ibd->ibd_bd, cmd->t_task_lba,
spc_get_write_same_sectors(cmd), GFP_KERNEL,
0);
if (ret < 0) {
pr_debug("blkdev_issue_discard() failed for WRITE_SAME\n");
return ret;
}
target_complete_cmd(cmd, GOOD);
return 0;
}
enum {
Opt_udev_path, Opt_readonly, Opt_force, Opt_err
};
@ -669,6 +686,7 @@ static void iblock_bio_done(struct bio *bio, int err)
static struct spc_ops iblock_spc_ops = {
.execute_rw = iblock_execute_rw,
.execute_sync_cache = iblock_execute_sync_cache,
.execute_write_same = iblock_execute_write_same,
};
static int iblock_parse_cdb(struct se_cmd *cmd)

52
drivers/target/target_core_sbc.c
View file

@ -156,24 +156,9 @@ static int sbc_emulate_unmap(struct se_cmd *cmd)
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;

2
include/target/target_core_backend.h
View file

@ -42,6 +42,7 @@ struct se_subsystem_api {
struct spc_ops {
int (*execute_rw)(struct se_cmd *cmd);
int (*execute_sync_cache)(struct se_cmd *cmd);
int (*execute_write_same)(struct se_cmd *cmd);
};
int transport_subsystem_register(struct se_subsystem_api *);
@ -55,6 +56,7 @@ void target_complete_cmd(struct se_cmd *, u8);
int sbc_parse_cdb(struct se_cmd *cmd, struct spc_ops *ops);
int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size);
int spc_get_write_same_sectors(struct se_cmd *cmd);
void transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *);
int transport_set_vpd_assoc(struct t10_vpd *, unsigned char *);