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authorAkinobu Mita <akinobu.mita@gmail.com>2015-04-05 23:59:38 +0900
committerNicholas Bellinger <nab@linux-iscsi.org>2015-04-07 23:27:59 -0700
commit6766cc81191c946dcb8e8bfe49f220f9a1cc8b5c (patch)
treeb5945fa9c455771e40d35b03d112d58d800ac1df /drivers/target
parent2e1cd90d718a5fc721e0caa0dc9f037d9b1f46b8 (diff)
target/rd: reduce code duplication in rd_execute_rw()
Factor out code duplication in rd_execute_rw() into a helper function rd_do_prot_rw(). This change is required to minimize the forthcoming fix in rd_do_prot_rw(). (Fix up v4.1 for-next fuzz - nab) Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Sagi Grimberg <sagig@dev.mellanox.co.il> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: target-devel@vger.kernel.org Cc: linux-scsi@vger.kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_rd.c66
1 files changed, 32 insertions, 34 deletions
diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c
index bedd4a18b3ca..ccf62a88f017 100644
--- a/drivers/target/target_core_rd.c
+++ b/drivers/target/target_core_rd.c
@@ -382,6 +382,36 @@ 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)
+{
+ struct se_device *se_dev = cmd->se_dev;
+ struct rd_dev *dev = RD_DEV(se_dev);
+ struct rd_dev_sg_table *prot_table;
+ struct scatterlist *prot_sg;
+ u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size;
+ u32 prot_offset, prot_page;
+ u64 tmp;
+ sense_reason_t rc;
+
+ tmp = cmd->t_task_lba * se_dev->prot_length;
+ prot_offset = do_div(tmp, PAGE_SIZE);
+ prot_page = tmp;
+
+ prot_table = rd_get_prot_table(dev, prot_page);
+ if (!prot_table)
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+
+ prot_sg = &prot_table->sg_table[prot_page -
+ prot_table->page_start_offset];
+
+ rc = dif_verify(cmd, cmd->t_task_lba, sectors, 0, prot_sg, prot_offset);
+
+ return rc;
+}
+
static sense_reason_t
rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
enum dma_data_direction data_direction)
@@ -421,23 +451,7 @@ 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) {
- struct rd_dev_sg_table *prot_table;
- struct scatterlist *prot_sg;
- u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size;
- u32 prot_offset, prot_page;
-
- tmp = cmd->t_task_lba * se_dev->prot_length;
- prot_offset = do_div(tmp, PAGE_SIZE);
- prot_page = tmp;
-
- prot_table = rd_get_prot_table(dev, prot_page);
- if (!prot_table)
- return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
-
- prot_sg = &prot_table->sg_table[prot_page - prot_table->page_start_offset];
-
- rc = sbc_dif_verify_write(cmd, cmd->t_task_lba, sectors, 0,
- prot_sg, prot_offset);
+ rc = rd_do_prot_rw(cmd, sbc_dif_verify_write);
if (rc)
return rc;
}
@@ -505,23 +519,7 @@ 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) {
- struct rd_dev_sg_table *prot_table;
- struct scatterlist *prot_sg;
- u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size;
- u32 prot_offset, prot_page;
-
- tmp = cmd->t_task_lba * se_dev->prot_length;
- prot_offset = do_div(tmp, PAGE_SIZE);
- prot_page = tmp;
-
- prot_table = rd_get_prot_table(dev, prot_page);
- if (!prot_table)
- return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
-
- prot_sg = &prot_table->sg_table[prot_page - prot_table->page_start_offset];
-
- rc = sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0,
- prot_sg, prot_offset);
+ rc = rd_do_prot_rw(cmd, sbc_dif_verify_read);
if (rc)
return rc;
}