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authorNicholas Bellinger <nab@linux-iscsi.org>2014-11-28 05:57:27 +0300
committerNicholas Bellinger <nab@linux-iscsi.org>2014-12-02 08:35:40 +0300
commit7a23f890b7c11b63dfc2a6c7ae1f0a631ed84865 (patch)
tree0146bf041a4ab32fccf639be9ead638d2b41ea72 /include/target
parentd23ab570bcb1de0256f1dcea0b8ad3af8e534e40 (diff)
downloadlinux-7a23f890b7c11b63dfc2a6c7ae1f0a631ed84865.tar.xz
target: Add target_core_backend_configfs.h helper macros
This patch adds a number of configfs e-attr macros following what existing target_core_configfs.c code does for internal target_backend_dev_attrib setup, and similar to how target fabric drivers allow for external config_item_type + cit->ct_attrs. assignment. This is useful for backend drivers like PSCSI who need to only expose a small subset of device attributes, while still retaining a default list of attributes for other backend drivers like IBLOCK, FILEIO, RAMDISK, and TCMU. Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'include/target')
-rw-r--r--include/target/target_core_backend_configfs.h53
1 files changed, 53 insertions, 0 deletions
diff --git a/include/target/target_core_backend_configfs.h b/include/target/target_core_backend_configfs.h
new file mode 100644
index 000000000000..f91935b5ef24
--- /dev/null
+++ b/include/target/target_core_backend_configfs.h
@@ -0,0 +1,53 @@
+#ifndef TARGET_CORE_BACKEND_CONFIGFS_H
+#define TARGET_CORE_BACKEND_CONFIGFS_H
+
+#include <target/configfs_macros.h>
+
+#define DEF_TB_DEV_ATTRIB_SHOW(_backend, _name) \
+static ssize_t _backend##_dev_show_attr_##_name( \
+ struct se_dev_attrib *da, \
+ char *page) \
+{ \
+ return snprintf(page, PAGE_SIZE, "%u\n", \
+ (u32)da->da_dev->dev_attrib._name); \
+}
+
+#define DEF_TB_DEV_ATTRIB_STORE(_backend, _name) \
+static ssize_t _backend##_dev_store_attr_##_name( \
+ struct se_dev_attrib *da, \
+ const char *page, \
+ size_t count) \
+{ \
+ unsigned long val; \
+ int ret; \
+ \
+ ret = kstrtoul(page, 0, &val); \
+ if (ret < 0) { \
+ pr_err("kstrtoul() failed with ret: %d\n", ret); \
+ return -EINVAL; \
+ } \
+ ret = se_dev_set_##_name(da->da_dev, (u32)val); \
+ \
+ return (!ret) ? count : -EINVAL; \
+}
+
+#define DEF_TB_DEV_ATTRIB(_backend, _name) \
+DEF_TB_DEV_ATTRIB_SHOW(_backend, _name); \
+DEF_TB_DEV_ATTRIB_STORE(_backend, _name);
+
+#define DEF_TB_DEV_ATTRIB_RO(_backend, name) \
+DEF_TB_DEV_ATTRIB_SHOW(_backend, name);
+
+CONFIGFS_EATTR_STRUCT(target_backend_dev_attrib, se_dev_attrib);
+#define TB_DEV_ATTR(_backend, _name, _mode) \
+static struct target_backend_dev_attrib_attribute _backend##_dev_attrib_##_name = \
+ __CONFIGFS_EATTR(_name, _mode, \
+ _backend##_dev_show_attr_##_name, \
+ _backend##_dev_store_attr_##_name);
+
+#define TB_DEV_ATTR_RO(_backend, _name) \
+static struct target_backend_dev_attrib_attribute _backend##_dev_attrib_##_name = \
+ __CONFIGFS_EATTR_RO(_name, \
+ _backend##_dev_show_attr_##_name);
+
+#endif /* TARGET_CORE_BACKEND_CONFIGFS_H */