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authorBryant G. Ly <bryantly@linux.vnet.ibm.com>2017-06-06 09:28:48 -0500
committerNicholas Bellinger <nab@linux-iscsi.org>2017-07-06 23:11:29 -0700
commit9a8bb60650b3d6994bd19a3200941f029c95a7a0 (patch)
tree98bf2358b8fe3e65ae5f24a25fba46654427bb29 /drivers/target
parente9447a46e9fba006ff9b0f4e40a4e38bf2d788db (diff)
tcmu: Support emulate_write_cache
This will enable the toggling of write_cache in tcmu through targetcli-fb Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com> Reviewed-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_user.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index beb5f098f32d..0c797cc69d9e 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -1290,6 +1290,8 @@ static int tcmu_configure_device(struct se_device *dev)
/* Other attributes can be configured in userspace */
if (!dev->dev_attrib.hw_max_sectors)
dev->dev_attrib.hw_max_sectors = 128;
+ if (!dev->dev_attrib.emulate_write_cache)
+ dev->dev_attrib.emulate_write_cache = 0;
dev->dev_attrib.hw_queue_depth = 128;
/*
@@ -1546,6 +1548,32 @@ static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *pag
}
CONFIGFS_ATTR(tcmu_, cmd_time_out);
+static ssize_t tcmu_emulate_write_cache_show(struct config_item *item,
+ char *page)
+{
+ struct se_dev_attrib *da = container_of(to_config_group(item),
+ struct se_dev_attrib, da_group);
+
+ return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache);
+}
+
+static ssize_t tcmu_emulate_write_cache_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct se_dev_attrib *da = container_of(to_config_group(item),
+ struct se_dev_attrib, da_group);
+ int val;
+ int ret;
+
+ ret = kstrtouint(page, 0, &val);
+ if (ret < 0)
+ return ret;
+
+ da->emulate_write_cache = val;
+ return count;
+}
+CONFIGFS_ATTR(tcmu_, emulate_write_cache);
+
static struct configfs_attribute **tcmu_attrs;
static struct target_backend_ops tcmu_ops = {
@@ -1682,6 +1710,8 @@ static int __init tcmu_module_init(void)
tcmu_attrs[i] = passthrough_attrib_attrs[i];
}
tcmu_attrs[i] = &tcmu_attr_cmd_time_out;
+ i++;
+ tcmu_attrs[i] = &tcmu_attr_emulate_write_cache;
tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs;
ret = transport_backend_register(&tcmu_ops);

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