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authorSheng Yang <sheng@yasker.org>2015-11-15 01:17:16 +0300
committerNicholas Bellinger <nab@linux-iscsi.org>2015-11-29 14:01:45 +0300
commit2628b352c3d4905adf8129ea50900bd980b6ccef (patch)
tree632ad805862f0b022c668ed5d0192eb4a0e37a58 /drivers/target/loopback
parent1ec218373b8ebda821aec00bb156a9c94fad9cd4 (diff)
downloadlinux-2628b352c3d4905adf8129ea50900bd980b6ccef.tar.xz
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 <sheng@yasker.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/loopback')
-rw-r--r--drivers/target/loopback/tcm_loop.c14
1 files changed, 14 insertions, 0 deletions
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,
};