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https://github.com/edk2-porting/linux-next.git
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7a23f890b7
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>
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
#ifndef TARGET_CORE_BACKEND_CONFIGFS_H
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#define TARGET_CORE_BACKEND_CONFIGFS_H
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#include <target/configfs_macros.h>
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#define DEF_TB_DEV_ATTRIB_SHOW(_backend, _name) \
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static ssize_t _backend##_dev_show_attr_##_name( \
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struct se_dev_attrib *da, \
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char *page) \
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{ \
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return snprintf(page, PAGE_SIZE, "%u\n", \
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(u32)da->da_dev->dev_attrib._name); \
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}
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#define DEF_TB_DEV_ATTRIB_STORE(_backend, _name) \
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static ssize_t _backend##_dev_store_attr_##_name( \
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struct se_dev_attrib *da, \
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const char *page, \
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size_t count) \
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{ \
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unsigned long val; \
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int ret; \
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\
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ret = kstrtoul(page, 0, &val); \
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if (ret < 0) { \
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pr_err("kstrtoul() failed with ret: %d\n", ret); \
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return -EINVAL; \
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} \
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ret = se_dev_set_##_name(da->da_dev, (u32)val); \
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\
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return (!ret) ? count : -EINVAL; \
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}
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#define DEF_TB_DEV_ATTRIB(_backend, _name) \
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DEF_TB_DEV_ATTRIB_SHOW(_backend, _name); \
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DEF_TB_DEV_ATTRIB_STORE(_backend, _name);
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#define DEF_TB_DEV_ATTRIB_RO(_backend, name) \
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DEF_TB_DEV_ATTRIB_SHOW(_backend, name);
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CONFIGFS_EATTR_STRUCT(target_backend_dev_attrib, se_dev_attrib);
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#define TB_DEV_ATTR(_backend, _name, _mode) \
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static struct target_backend_dev_attrib_attribute _backend##_dev_attrib_##_name = \
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__CONFIGFS_EATTR(_name, _mode, \
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_backend##_dev_show_attr_##_name, \
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_backend##_dev_store_attr_##_name);
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#define TB_DEV_ATTR_RO(_backend, _name) \
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static struct target_backend_dev_attrib_attribute _backend##_dev_attrib_##_name = \
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__CONFIGFS_EATTR_RO(_name, \
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_backend##_dev_show_attr_##_name);
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#endif /* TARGET_CORE_BACKEND_CONFIGFS_H */
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