From 86d7182985d25900929adce14fffd729cc8c6fb8 Mon Sep 17 00:00:00 2001 From: Asias He Date: Mon, 25 Feb 2013 14:03:46 +0800 Subject: target: Add sbc_execute_unmap() helper iblock_execute_unmap() and fd_execute_unmap share a lot of code. Add sbc_execute_unmap() helper to remove duplicated code for iblock_execute_unmap() and fd_execute_unmap(). Cc: Christoph Hellwig Cc: Martin K. Petersen Cc: Nicholas Bellinger Signed-off-by: Asias He Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_sbc.c | 85 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) (limited to 'drivers/target/target_core_sbc.c') diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index 60d4b51..bbc5b0e 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -596,3 +596,88 @@ u32 sbc_get_device_type(struct se_device *dev) return TYPE_DISK; } EXPORT_SYMBOL(sbc_get_device_type); + +sense_reason_t +sbc_execute_unmap(struct se_cmd *cmd, + sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, + sector_t, sector_t), + void *priv) +{ + struct se_device *dev = cmd->se_dev; + unsigned char *buf, *ptr = NULL; + sector_t lba; + int size; + u32 range; + sense_reason_t ret = 0; + int dl, bd_dl; + + /* We never set ANC_SUP */ + if (cmd->t_task_cdb[1]) + return TCM_INVALID_CDB_FIELD; + + if (cmd->data_length == 0) { + target_complete_cmd(cmd, SAM_STAT_GOOD); + return 0; + } + + if (cmd->data_length < 8) { + pr_warn("UNMAP parameter list length %u too small\n", + cmd->data_length); + return TCM_PARAMETER_LIST_LENGTH_ERROR; + } + + buf = transport_kmap_data_sg(cmd); + if (!buf) + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + + dl = get_unaligned_be16(&buf[0]); + bd_dl = get_unaligned_be16(&buf[2]); + + size = cmd->data_length - 8; + if (bd_dl > size) + pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", + cmd->data_length, bd_dl); + else + size = bd_dl; + + if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { + ret = TCM_INVALID_PARAMETER_LIST; + goto err; + } + + /* First UNMAP block descriptor starts at 8 byte offset */ + ptr = &buf[8]; + pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" + " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); + + while (size >= 16) { + lba = get_unaligned_be64(&ptr[0]); + range = get_unaligned_be32(&ptr[8]); + pr_debug("UNMAP: Using lba: %llu and range: %u\n", + (unsigned long long)lba, range); + + if (range > dev->dev_attrib.max_unmap_lba_count) { + ret = TCM_INVALID_PARAMETER_LIST; + goto err; + } + + if (lba + range > dev->transport->get_blocks(dev) + 1) { + ret = TCM_ADDRESS_OUT_OF_RANGE; + goto err; + } + + ret = do_unmap_fn(cmd, priv, lba, range); + if (ret) + goto err; + + ptr += 16; + size -= 16; + } + +err: + transport_kunmap_data_sg(cmd); + if (!ret) + target_complete_cmd(cmd, GOOD); + return ret; +} +EXPORT_SYMBOL(sbc_execute_unmap); -- cgit v1.1