diff options
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/target_core_sbc.c | 51 |
1 files changed, 23 insertions, 28 deletions
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index b802421..a5a8f46 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -235,26 +235,30 @@ static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) 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) { 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; } - /* - * 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; } @@ -418,9 +422,6 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) cmd->se_cmd_flags |= SCF_FUA; break; case WRITE_SAME_32: - if (!ops->execute_write_same) - return TCM_UNSUPPORTED_SCSI_OPCODE; - sectors = transport_get_sectors_32(cdb); if (!sectors) { pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" @@ -431,9 +432,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) size = sbc_get_size(cmd, 1); cmd->t_task_lba = get_unaligned_be64(&cdb[12]); - if (sbc_write_same_supported(dev, &cdb[10]) < 0) - return TCM_UNSUPPORTED_SCSI_OPCODE; - cmd->execute_cmd = ops->execute_write_same; + ret = sbc_setup_write_same(cmd, &cdb[10], ops); + if (ret < 0) + return ret; break; default: pr_err("VARIABLE_LENGTH_CMD service action" @@ -495,9 +496,6 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) cmd->execute_cmd = ops->execute_unmap; break; case WRITE_SAME_16: - if (!ops->execute_write_same) - return TCM_UNSUPPORTED_SCSI_OPCODE; - sectors = transport_get_sectors_16(cdb); if (!sectors) { pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); @@ -507,14 +505,11 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) size = sbc_get_size(cmd, 1); cmd->t_task_lba = get_unaligned_be64(&cdb[2]); - if (sbc_write_same_supported(dev, &cdb[1]) < 0) - return TCM_UNSUPPORTED_SCSI_OPCODE; - cmd->execute_cmd = ops->execute_write_same; + ret = sbc_setup_write_same(cmd, &cdb[1], ops); + if (ret < 0) + return ret; break; case WRITE_SAME: - if (!ops->execute_write_same) - return TCM_UNSUPPORTED_SCSI_OPCODE; - sectors = transport_get_sectors_10(cdb); if (!sectors) { pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); @@ -528,9 +523,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) * 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) - return TCM_UNSUPPORTED_SCSI_OPCODE; - cmd->execute_cmd = ops->execute_write_same; + ret = sbc_setup_write_same(cmd, &cdb[1], ops); + if (ret < 0) + return ret; break; case VERIFY: size = 0; |