diff options
Diffstat (limited to 'drivers/target/target_core_iblock.c')
| -rw-r--r-- | drivers/target/target_core_iblock.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c index abe4eb997a84..026a758e5778 100644 --- a/drivers/target/target_core_iblock.c +++ b/drivers/target/target_core_iblock.c @@ -413,8 +413,39 @@ iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) } static sense_reason_t +iblock_execute_write_same_direct(struct block_device *bdev, struct se_cmd *cmd) +{ + struct se_device *dev = cmd->se_dev; + struct scatterlist *sg = &cmd->t_data_sg[0]; + struct page *page = NULL; + int ret; + + if (sg->offset) { + page = alloc_page(GFP_KERNEL); + if (!page) + return TCM_OUT_OF_RESOURCES; + sg_copy_to_buffer(sg, cmd->t_data_nents, page_address(page), + dev->dev_attrib.block_size); + } + + ret = blkdev_issue_write_same(bdev, + target_to_linux_sector(dev, cmd->t_task_lba), + target_to_linux_sector(dev, + sbc_get_write_same_sectors(cmd)), + GFP_KERNEL, page ? page : sg_page(sg)); + if (page) + __free_page(page); + if (ret) + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + + target_complete_cmd(cmd, GOOD); + return 0; +} + +static sense_reason_t iblock_execute_write_same(struct se_cmd *cmd) { + struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; struct iblock_req *ibr; struct scatterlist *sg; struct bio *bio; @@ -439,6 +470,9 @@ iblock_execute_write_same(struct se_cmd *cmd) return TCM_INVALID_CDB_FIELD; } + if (bdev_write_same(bdev)) + return iblock_execute_write_same_direct(bdev, cmd); + ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); if (!ibr) goto fail; |