/*
* SCSI Block Commands (SBC) parsing and emulation.
*
- * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
- * Copyright (c) 2005, 2006, 2007 SBE, Inc.
- * Copyright (c) 2007-2010 Rising Tide Systems
- * Copyright (c) 2008-2010 Linux-iSCSI.org
+ * (c) Copyright 2002-2012 RisingTide Systems LLC.
*
* Nicholas A. Bellinger <nab@kernel.org>
*
#include "target_core_ua.h"
-static int sbc_emulate_readcapacity(struct se_cmd *cmd)
+static sense_reason_t
+sbc_emulate_readcapacity(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
unsigned long long blocks_long = dev->transport->get_blocks(dev);
buf[1] = (blocks >> 16) & 0xff;
buf[2] = (blocks >> 8) & 0xff;
buf[3] = blocks & 0xff;
- buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
- buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
- buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
- buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
+ buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
+ buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
+ buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
+ buf[7] = dev->dev_attrib.block_size & 0xff;
rbuf = transport_kmap_data_sg(cmd);
- if (rbuf) {
- memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
- transport_kunmap_data_sg(cmd);
- }
+ if (!rbuf)
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+
+ memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
+ transport_kunmap_data_sg(cmd);
target_complete_cmd(cmd, GOOD);
return 0;
}
-static int sbc_emulate_readcapacity_16(struct se_cmd *cmd)
+static sense_reason_t
+sbc_emulate_readcapacity_16(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
unsigned char *rbuf;
buf[5] = (blocks >> 16) & 0xff;
buf[6] = (blocks >> 8) & 0xff;
buf[7] = blocks & 0xff;
- buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
- buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
- buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
- buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
+ buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
+ buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
+ buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
+ buf[11] = dev->dev_attrib.block_size & 0xff;
/*
* Set Thin Provisioning Enable bit following sbc3r22 in section
* READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
*/
- if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
+ if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
buf[14] = 0x80;
rbuf = transport_kmap_data_sg(cmd);
- if (rbuf) {
- memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
- transport_kunmap_data_sg(cmd);
- }
+ if (!rbuf)
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+
+ memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
+ transport_kunmap_data_sg(cmd);
target_complete_cmd(cmd, GOOD);
return 0;
}
-int spc_get_write_same_sectors(struct se_cmd *cmd)
+sector_t spc_get_write_same_sectors(struct se_cmd *cmd)
{
u32 num_blocks;
}
EXPORT_SYMBOL(spc_get_write_same_sectors);
-static int sbc_emulate_verify(struct se_cmd *cmd)
-{
- target_complete_cmd(cmd, GOOD);
- return 0;
-}
-
-static int sbc_emulate_noop(struct se_cmd *cmd)
+static sense_reason_t
+sbc_emulate_noop(struct se_cmd *cmd)
{
target_complete_cmd(cmd, GOOD);
return 0;
static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
{
- return cmd->se_dev->se_sub_dev->se_dev_attrib.block_size * sectors;
+ return cmd->se_dev->dev_attrib.block_size * sectors;
}
static int sbc_check_valid_sectors(struct se_cmd *cmd)
unsigned long long end_lba;
u32 sectors;
- sectors = cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size;
+ sectors = cmd->data_length / dev->dev_attrib.block_size;
end_lba = dev->transport->get_blocks(dev) + 1;
if (cmd->t_task_lba + sectors > end_lba) {
return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
}
-static int sbc_write_same_supported(struct se_device *dev,
- unsigned char *flags)
+static sense_reason_t
+sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
{
+ unsigned int sectors = spc_get_write_same_sectors(cmd);
+
if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
pr_err("WRITE_SAME PBDATA and LBDATA"
" bits not supported for Block Discard"
" Emulation\n");
- return -ENOSYS;
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+ }
+ if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
+ pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
+ sectors, cmd->se_dev->dev_attrib.max_write_same_len);
+ return TCM_INVALID_CDB_FIELD;
}
-
/*
- * Currently for the emulated case we only accept
- * tpws with the UNMAP=1 bit set.
+ * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
+ * translated into block discard requests within backend code.
*/
- if (!(flags[0] & 0x08)) {
- pr_err("WRITE_SAME w/o UNMAP bit not"
- " supported for Block Discard Emulation\n");
- return -ENOSYS;
+ if (flags[0] & 0x08) {
+ if (!ops->execute_write_same_unmap)
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+
+ cmd->execute_cmd = ops->execute_write_same_unmap;
+ return 0;
}
+ if (!ops->execute_write_same)
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
+ cmd->execute_cmd = ops->execute_write_same;
return 0;
}
kfree(buf);
}
-int sbc_parse_cdb(struct se_cmd *cmd, struct spc_ops *ops)
+sense_reason_t
+sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
{
- struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
struct se_device *dev = cmd->se_dev;
unsigned char *cdb = cmd->t_task_cdb;
unsigned int size;
u32 sectors = 0;
- int ret;
+ sense_reason_t ret;
switch (cdb[0]) {
case READ_6:
cmd->execute_cmd = ops->execute_rw;
break;
case XDWRITEREAD_10:
- if ((cmd->data_direction != DMA_TO_DEVICE) ||
+ if (cmd->data_direction != DMA_TO_DEVICE ||
!(cmd->se_cmd_flags & SCF_BIDI))
- goto out_invalid_cdb_field;
+ return TCM_INVALID_CDB_FIELD;
sectors = transport_get_sectors_10(cdb);
cmd->t_task_lba = transport_lba_32(cdb);
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"
" supported\n");
- goto out_invalid_cdb_field;
+ return TCM_INVALID_CDB_FIELD;
}
size = sbc_get_size(cmd, 1);
cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
- if (sbc_write_same_supported(dev, &cdb[10]) < 0)
- goto out_unsupported_cdb;
- cmd->execute_cmd = ops->execute_write_same;
+ ret = sbc_setup_write_same(cmd, &cdb[10], ops);
+ if (ret)
+ return ret;
break;
default:
pr_err("VARIABLE_LENGTH_CMD service action"
" 0x%04x not supported\n", service_action);
- goto out_unsupported_cdb;
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
}
break;
}
default:
pr_err("Unsupported SA: 0x%02x\n",
cmd->t_task_cdb[1] & 0x1f);
- goto out_invalid_cdb_field;
+ return TCM_INVALID_CDB_FIELD;
}
size = (cdb[10] << 24) | (cdb[11] << 16) |
(cdb[12] << 8) | cdb[13];
case SYNCHRONIZE_CACHE:
case SYNCHRONIZE_CACHE_16:
if (!ops->execute_sync_cache)
- goto out_unsupported_cdb;
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
/*
* Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
*/
if (cmd->t_task_lba || sectors) {
if (sbc_check_valid_sectors(cmd) < 0)
- goto out_invalid_cdb_field;
+ return TCM_INVALID_CDB_FIELD;
}
cmd->execute_cmd = ops->execute_sync_cache;
break;
case UNMAP:
if (!ops->execute_unmap)
- goto out_unsupported_cdb;
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
size = get_unaligned_be16(&cdb[7]);
cmd->execute_cmd = ops->execute_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");
- goto out_invalid_cdb_field;
+ return TCM_INVALID_CDB_FIELD;
}
size = sbc_get_size(cmd, 1);
cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
- if (sbc_write_same_supported(dev, &cdb[1]) < 0)
- goto out_unsupported_cdb;
- cmd->execute_cmd = ops->execute_write_same;
+ ret = sbc_setup_write_same(cmd, &cdb[1], ops);
+ if (ret)
+ return ret;
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");
- goto out_invalid_cdb_field;
+ return TCM_INVALID_CDB_FIELD;
}
size = sbc_get_size(cmd, 1);
* Follow sbcr26 with WRITE_SAME (10) and check for the existence
* of byte 1 bit 3 UNMAP instead of original reserved field
*/
- if (sbc_write_same_supported(dev, &cdb[1]) < 0)
- goto out_unsupported_cdb;
- cmd->execute_cmd = ops->execute_write_same;
+ ret = sbc_setup_write_same(cmd, &cdb[1], ops);
+ if (ret)
+ return ret;
break;
case VERIFY:
size = 0;
- cmd->execute_cmd = sbc_emulate_verify;
+ cmd->execute_cmd = sbc_emulate_noop;
break;
case REZERO_UNIT:
case SEEK_6:
/* reject any command that we don't have a handler for */
if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
- goto out_unsupported_cdb;
+ return TCM_UNSUPPORTED_SCSI_OPCODE;
if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
unsigned long long end_lba;
- if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
+ if (sectors > dev->dev_attrib.fabric_max_sectors) {
printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
" big sectors %u exceeds fabric_max_sectors:"
" %u\n", cdb[0], sectors,
- su_dev->se_dev_attrib.fabric_max_sectors);
- goto out_invalid_cdb_field;
+ dev->dev_attrib.fabric_max_sectors);
+ return TCM_INVALID_CDB_FIELD;
}
- if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
+ if (sectors > dev->dev_attrib.hw_max_sectors) {
printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
" big sectors %u exceeds backend hw_max_sectors:"
" %u\n", cdb[0], sectors,
- su_dev->se_dev_attrib.hw_max_sectors);
- goto out_invalid_cdb_field;
+ dev->dev_attrib.hw_max_sectors);
+ return TCM_INVALID_CDB_FIELD;
}
end_lba = dev->transport->get_blocks(dev) + 1;
pr_err("cmd exceeds last lba %llu "
"(lba %llu, sectors %u)\n",
end_lba, cmd->t_task_lba, sectors);
- goto out_invalid_cdb_field;
+ return TCM_INVALID_CDB_FIELD;
}
size = sbc_get_size(cmd, sectors);
}
- ret = target_cmd_size_check(cmd, size);
- if (ret < 0)
- return ret;
-
- return 0;
-
-out_unsupported_cdb:
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
- return -EINVAL;
-out_invalid_cdb_field:
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
- return -EINVAL;
+ return target_cmd_size_check(cmd, size);
}
EXPORT_SYMBOL(sbc_parse_cdb);
+
+u32 sbc_get_device_type(struct se_device *dev)
+{
+ return TYPE_DISK;
+}
+EXPORT_SYMBOL(sbc_get_device_type);
projects / firefly-linux-kernel-4.4.55.git / blobdiff