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target: Merge sbc_verify_dif_read|write

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Instead of providing DIF verify routines for read/write
that are almost identical and conditionally copy protection
information, just let the caller do the right thing.

Have a single sbc_dif_verify that handles an sgl (that
does NOT copy any data) and a protection information copy
routine used by rd_mcp and fileio backend.

In the WRITE case, call sbc_dif_verify with cmd->t_prot_sg
and then do the copy from it to local sgl (assuming the verify
succeeded of course). In the READ case, call sbc_dif_verify
with the local sgl and if it succeeds, copy it to t_prot_sg (or
not if we are stripping it).

(Fix apply breakage from commit c836777 - nab)

Tested-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Sagi Grimberg 2015-04-19 20:27:19 +03:00 • committed by Nicholas Bellinger
parent b2feda4feb
commit f75b6fae1a
5 changed files with 37 additions and 112 deletions
Download patch file Download diff file Expand all files Collapse all files

20
drivers/target/target_core_rd.c
View file

@ -403,10 +403,7 @@ static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page
return NULL;
}
typedef sense_reason_t (*dif_verify)(struct se_cmd *, sector_t, unsigned int,
unsigned int, struct scatterlist *, int);
static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, dif_verify dif_verify)
static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read)
{
struct se_device *se_dev = cmd->se_dev;
struct rd_dev *dev = RD_DEV(se_dev);
@ -466,7 +463,16 @@ static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, dif_verify dif_verify)
#endif /* !CONFIG_ARCH_HAS_SG_CHAIN */
rc = dif_verify(cmd, cmd->t_task_lba, sectors, 0, prot_sg, prot_offset);
if (is_read)
rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
prot_sg, prot_offset);
else
rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
cmd->t_prot_sg, 0);
if (!rc)
sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset);
if (need_to_release)
kfree(prot_sg);
@ -512,7 +518,7 @@ rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type &&
data_direction == DMA_TO_DEVICE) {
rc = rd_do_prot_rw(cmd, sbc_dif_verify_write);
rc = rd_do_prot_rw(cmd, false);
if (rc)
return rc;
}
@ -580,7 +586,7 @@ rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type &&
data_direction == DMA_FROM_DEVICE) {
rc = rd_do_prot_rw(cmd, sbc_dif_verify_read);
rc = rd_do_prot_rw(cmd, true);
if (rc)
return rc;
}