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| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2014-11-27 18:57:27 -0800 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2014-12-01 21:35:40 -0800 |
| commit | 7a23f890b7c11b63dfc2a6c7ae1f0a631ed84865 (patch) | |
| tree | 0146bf041a4ab32fccf639be9ead638d2b41ea72 /include | |
| parent | d23ab570bcb1de0256f1dcea0b8ad3af8e534e40 (diff) | |
| download | linux-7a23f890b7c11b63dfc2a6c7ae1f0a631ed84865.tar.gz | |
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')
| -rw-r--r-- | include/target/target_core_backend_configfs.h | 53 |
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 */ |