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authorMike Christie <mchristi@redhat.com>2017-07-10 22:53:31 +0300
committerNicholas Bellinger <nab@linux-iscsi.org>2017-07-11 06:05:27 +0300
commitc17d5d5f51f72f24e0e17a4450ae5010bf6962d9 (patch)
treeb03a0c7110d5f3e0d1b36deac77abe38b886842a /drivers/target
parent7ee0031786dc3762f61d0ec9171bb75d56a5ac76 (diff)
downloadlinux-c17d5d5f51f72f24e0e17a4450ae5010bf6962d9.tar.xz
target: export lio pgr/alua support as device attr
Older kernels could crash or hang if the user write/read some ALUA files with pscsi and tcmu backends. This patch exports if LIO supports executing PGR and ALUA scsi commands/checks for the se_device, so userspace can easily test. Signed-off-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_configfs.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 9b8abd55c21c..7e87d952bb7a 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -1085,6 +1085,24 @@ static ssize_t block_size_store(struct config_item *item,
return count;
}
+static ssize_t alua_support_show(struct config_item *item, char *page)
+{
+ struct se_dev_attrib *da = to_attrib(item);
+ u8 flags = da->da_dev->transport->transport_flags;
+
+ return snprintf(page, PAGE_SIZE, "%d\n",
+ flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ? 0 : 1);
+}
+
+static ssize_t pgr_support_show(struct config_item *item, char *page)
+{
+ struct se_dev_attrib *da = to_attrib(item);
+ u8 flags = da->da_dev->transport->transport_flags;
+
+ return snprintf(page, PAGE_SIZE, "%d\n",
+ flags & TRANSPORT_FLAG_PASSTHROUGH_PGR ? 0 : 1);
+}
+
CONFIGFS_ATTR(, emulate_model_alias);
CONFIGFS_ATTR(, emulate_dpo);
CONFIGFS_ATTR(, emulate_fua_write);
@@ -1116,6 +1134,8 @@ CONFIGFS_ATTR(, unmap_granularity);
CONFIGFS_ATTR(, unmap_granularity_alignment);
CONFIGFS_ATTR(, unmap_zeroes_data);
CONFIGFS_ATTR(, max_write_same_len);
+CONFIGFS_ATTR_RO(, alua_support);
+CONFIGFS_ATTR_RO(, pgr_support);
/*
* dev_attrib attributes for devices using the target core SBC/SPC
@@ -1154,6 +1174,8 @@ struct configfs_attribute *sbc_attrib_attrs[] = {
&attr_unmap_granularity_alignment,
&attr_unmap_zeroes_data,
&attr_max_write_same_len,
+ &attr_alua_support,
+ &attr_pgr_support,
NULL,
};
EXPORT_SYMBOL(sbc_attrib_attrs);
@@ -1168,6 +1190,8 @@ struct configfs_attribute *passthrough_attrib_attrs[] = {
&attr_hw_block_size,
&attr_hw_max_sectors,
&attr_hw_queue_depth,
+ &attr_alua_support,
+ &attr_pgr_support,
NULL,
};
EXPORT_SYMBOL(passthrough_attrib_attrs);