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authorNicholas Bellinger <nab@linux-iscsi.org>2015-09-16 03:27:35 +0300
committerNicholas Bellinger <nab@linux-iscsi.org>2015-09-25 09:17:21 +0300
commiteeeb9522231118138be418ff527dc8c9050f4707 (patch)
treebc9dc2d41c12551c52ad53449cf9b34171572fe9 /drivers
parent3ccd6e83df8a0d4a664edeecc453c4fa046395fb (diff)
downloadlinux-eeeb9522231118138be418ff527dc8c9050f4707.tar.xz
target: Propigate backend read-only to core_tpg_add_lun
This patch adds a DF_READ_ONLY flag that is used by IBLOCK to signal when a backend has been set to read-only mode, in order to propigate read-only status up to core_tpg_add_lun() for all future LUN fabric exports. With this is place, existing emulation for reporting read-only in spc_emulate_modesense() and normal transport_lookup_cmd_lun() TCM_WRITE_PROTECTED status checking just works as expected. Reported-by: Joeue Deng <joeue404@gmail.com> Reported-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/target/target_core_iblock.c2
-rw-r--r--drivers/target/target_core_tpg.c5
2 files changed, 6 insertions, 1 deletions
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index 5a9982f5d5d6..0f19e11acac2 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -105,6 +105,8 @@ static int iblock_configure_device(struct se_device *dev)
mode = FMODE_READ|FMODE_EXCL;
if (!ib_dev->ibd_readonly)
mode |= FMODE_WRITE;
+ else
+ dev->dev_flags |= DF_READ_ONLY;
bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev);
if (IS_ERR(bd)) {
diff --git a/drivers/target/target_core_tpg.c b/drivers/target/target_core_tpg.c
index 2d0381dd105c..5fb9dd7f08bb 100644
--- a/drivers/target/target_core_tpg.c
+++ b/drivers/target/target_core_tpg.c
@@ -668,7 +668,10 @@ int core_tpg_add_lun(
list_add_tail(&lun->lun_dev_link, &dev->dev_sep_list);
spin_unlock(&dev->se_port_lock);
- lun->lun_access = lun_access;
+ if (dev->dev_flags & DF_READ_ONLY)
+ lun->lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
+ else
+ lun->lun_access = lun_access;
if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
hlist_add_head_rcu(&lun->link, &tpg->tpg_lun_hlist);
mutex_unlock(&tpg->tpg_lun_mutex);