diff options
| author |   Nicholas Bellinger <nab@linux-iscsi.org> | 2014-04-02 14:34:11 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2014-04-07 01:48:57 -0700 |
| commit | 395ccb2531021974d309f26e5fb08a8240ac5f84 (patch) | |
| tree | 29209107f67d9d16e9e65c7174bbe74978805e85 /drivers/target | |
| parent | target: Enable WRITE_INSERT emulation in target_execute_cmd (diff) | |
| download | linux-dev-395ccb2531021974d309f26e5fb08a8240ac5f84.tar.xz linux-dev-395ccb2531021974d309f26e5fb08a8240ac5f84.zip | |
target/sbc: Add sbc_dif_read_strip software emulation
Split up __sbc_dif_verify_read() so that VERIFY READ emulation can
perform target-core specific READ_STRIP, seperate from the existing
FILEIO/RAMDISK backend emulation code.
Also add sbc_dif_read_strip() in order to determine number of sectors
using cmd->prot_length, and skip the extra sbc_dif_copy_prot().
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Cc: Quinn Tran <quinn.tran@qlogic.com>
Cc: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/target_core_sbc.c | 31 |
1 files changed, 27 insertions, 4 deletions
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index cc8c0ba53930..e0229592ec55 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -1271,9 +1271,9 @@ sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors, } EXPORT_SYMBOL(sbc_dif_verify_write); -sense_reason_t -sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, - unsigned int ei_lba, struct scatterlist *sg, int sg_off) +static sense_reason_t +__sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, + unsigned int ei_lba, struct scatterlist *sg, int sg_off) { struct se_device *dev = cmd->se_dev; struct se_dif_v1_tuple *sdt; @@ -1326,8 +1326,31 @@ sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, kunmap_atomic(paddr); kunmap_atomic(daddr); } - sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off); return 0; } + +sense_reason_t +sbc_dif_read_strip(struct se_cmd *cmd) +{ + struct se_device *dev = cmd->se_dev; + u32 sectors = cmd->prot_length / dev->prot_length; + + return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0, + cmd->t_prot_sg, 0); +} + +sense_reason_t +sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, + unsigned int ei_lba, struct scatterlist *sg, int sg_off) +{ + sense_reason_t rc; + + rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off); + if (rc) + return rc; + + sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off); + return 0; +} EXPORT_SYMBOL(sbc_dif_verify_read); |