target/iblock: Add iblock_do_unmap() helper

Add helper iblock_do_unmap() to remove duplicated code in
iblock_execute_write_same_unmap() and iblock_execute_unmap().

Cc: Christoph Hellwig <hch@lst.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Asias He <asias@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index 8bcc514..96a9b62 100644 (file)
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -380,6 +380,21 @@ iblock_execute_sync_cache(struct se_cmd *cmd)
 }
 
 static sense_reason_t
+iblock_do_unmap(struct se_cmd *cmd, struct block_device *bdev,
+               sector_t lba, sector_t nolb)
+{
+       int ret;
+
+       ret = blkdev_issue_discard(bdev, lba, nolb, GFP_KERNEL, 0);
+       if (ret < 0) {
+               pr_err("blkdev_issue_discard() failed: %d\n", ret);
+               return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+       }
+
+       return 0;
+}
+
+static sense_reason_t
 iblock_execute_unmap(struct se_cmd *cmd)
 {
        struct se_device *dev = cmd->se_dev;
@@ -389,7 +404,7 @@ iblock_execute_unmap(struct se_cmd *cmd)
        int size;
        u32 range;
        sense_reason_t ret = 0;
-       int dl, bd_dl, err;
+       int dl, bd_dl;
 
        /* We never set ANC_SUP */
        if (cmd->t_task_cdb[1])
@@ -446,14 +461,9 @@ iblock_execute_unmap(struct se_cmd *cmd)
                        goto err;
                }
 
-               err = blkdev_issue_discard(ib_dev->ibd_bd, lba, range,
-                                          GFP_KERNEL, 0);
-               if (err < 0) {
-                       pr_err("blkdev_issue_discard() failed: %d\n",
-                                       err);
-                       ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+               ret = iblock_do_unmap(cmd, ib_dev->ibd_bd, lba, range);
+               if (ret)
                        goto err;
-               }
 
                ptr += 16;
                size -= 16;
@@ -469,15 +479,14 @@ err:
 static sense_reason_t
 iblock_execute_write_same_unmap(struct se_cmd *cmd)
 {
-       struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev);
-       int rc;
-
-       rc = blkdev_issue_discard(ib_dev->ibd_bd, cmd->t_task_lba,
-                       sbc_get_write_same_sectors(cmd), GFP_KERNEL, 0);
-       if (rc < 0) {
-               pr_warn("blkdev_issue_discard() failed: %d\n", rc);
-               return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
-       }
+       struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
+       sector_t lba = cmd->t_task_lba;
+       sector_t nolb = sbc_get_write_same_sectors(cmd);
+       int ret;
+
+       ret = iblock_do_unmap(cmd, bdev, lba, nolb);
+       if (ret)
+               return ret;
 
        target_complete_cmd(cmd, GOOD);
        return 0;