From 2628b352c3d4905adf8129ea50900bd980b6ccef Mon Sep 17 00:00:00 2001 From: Sheng Yang Date: Sat, 14 Nov 2015 14:17:16 -0800 Subject: [PATCH] tcm_loop: Show address of tpg in configfs In the past, the scsi_host's number wasn't shown anywhere, user have to depends on vpg_83 to find the block device, which is also depends on backstore implementation. It's better for tcm_loop to provide necessary straightforward information on locate the block device it created. This patch would help to locate the block device created by tcm_loop. The address would be shown at e.g. /sys/kernel/config/target/loopback/naa.60014059436855c1/tpgt_1/address which would looks like "2:0:1", and the lun number can be found at "/tpgt_1/lun/lun_0". Altogether they formated the scsi address of device as "2:0:1:0", which can be used to locate the device easily through 'lsscsi'. (Update to >= v4.4-rc1 configfs attribute usage - nab) Signed-off-by: Sheng Yang Signed-off-by: Nicholas Bellinger --- drivers/target/loopback/tcm_loop.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c index 4fb0eca86857..d41a5c300e31 100644 --- a/drivers/target/loopback/tcm_loop.c +++ b/drivers/target/loopback/tcm_loop.c @@ -1036,12 +1036,26 @@ static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item, return -EINVAL; } +static ssize_t tcm_loop_tpg_address_show(struct config_item *item, + char *page) +{ + struct se_portal_group *se_tpg = to_tpg(item); + struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, + struct tcm_loop_tpg, tl_se_tpg); + struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; + + return snprintf(page, PAGE_SIZE, "%d:0:%d\n", + tl_hba->sh->host_no, tl_tpg->tl_tpgt); +} + CONFIGFS_ATTR(tcm_loop_tpg_, nexus); CONFIGFS_ATTR(tcm_loop_tpg_, transport_status); +CONFIGFS_ATTR_RO(tcm_loop_tpg_, address); static struct configfs_attribute *tcm_loop_tpg_attrs[] = { &tcm_loop_tpg_attr_nexus, &tcm_loop_tpg_attr_transport_status, + &tcm_loop_tpg_attr_address, NULL, };