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target/sbc: Add sbc_dif_read_strip software emulation

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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 <[email protected]>
Cc: Martin K. Petersen <[email protected]>
Cc: Or Gerlitz <[email protected]>
Cc: Quinn Tran <[email protected]>
Cc: Giridhar Malavali <[email protected]>
Signed-off-by: Nicholas Bellinger <[email protected]>
This commit is contained in:
Nicholas Bellinger 2014-04-02 14:34:11 -07:00
commit 395ccb2531
2 changed files with 28 additions and 4 deletions
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31
drivers/target/target_core_sbc.c
View file

@ -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);