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b98dd0b0a5
Since commit ee6d3dd4ed ("driver core: make kobj_type constant.")
the driver core allows the usage of const struct kobj_type.
Take advantage of this to constify the structure definitions to prevent
modification at runtime.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20230615121223.22502-3-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
143 lines
3.8 KiB
C
143 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHE_SYSFS_H_
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#define _BCACHE_SYSFS_H_
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#define KTYPE(type) \
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const struct kobj_type type ## _ktype = { \
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.release = type ## _release, \
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.sysfs_ops = &((const struct sysfs_ops) { \
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.show = type ## _show, \
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.store = type ## _store \
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}), \
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.default_groups = type ## _groups \
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}
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#define SHOW(fn) \
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static ssize_t fn ## _show(struct kobject *kobj, struct attribute *attr,\
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char *buf) \
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#define STORE(fn) \
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static ssize_t fn ## _store(struct kobject *kobj, struct attribute *attr,\
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const char *buf, size_t size) \
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#define SHOW_LOCKED(fn) \
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SHOW(fn) \
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{ \
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ssize_t ret; \
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mutex_lock(&bch_register_lock); \
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ret = __ ## fn ## _show(kobj, attr, buf); \
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mutex_unlock(&bch_register_lock); \
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return ret; \
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}
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#define STORE_LOCKED(fn) \
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STORE(fn) \
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{ \
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ssize_t ret; \
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mutex_lock(&bch_register_lock); \
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ret = __ ## fn ## _store(kobj, attr, buf, size); \
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mutex_unlock(&bch_register_lock); \
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return ret; \
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}
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#define __sysfs_attribute(_name, _mode) \
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static struct attribute sysfs_##_name = \
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{ .name = #_name, .mode = _mode }
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#define write_attribute(n) __sysfs_attribute(n, 0200)
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#define read_attribute(n) __sysfs_attribute(n, 0444)
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#define rw_attribute(n) __sysfs_attribute(n, 0644)
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#define sysfs_printf(file, fmt, ...) \
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do { \
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if (attr == &sysfs_ ## file) \
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return sysfs_emit(buf, fmt "\n", __VA_ARGS__); \
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} while (0)
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#define sysfs_print(file, var) \
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do { \
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if (attr == &sysfs_ ## file) \
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return sysfs_emit(buf, \
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__builtin_types_compatible_p(typeof(var), int) \
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? "%i\n" : \
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__builtin_types_compatible_p(typeof(var), unsigned int) \
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? "%u\n" : \
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__builtin_types_compatible_p(typeof(var), long) \
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? "%li\n" : \
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__builtin_types_compatible_p(typeof(var), unsigned long)\
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? "%lu\n" : \
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__builtin_types_compatible_p(typeof(var), int64_t) \
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? "%lli\n" : \
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__builtin_types_compatible_p(typeof(var), uint64_t) \
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? "%llu\n" : \
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__builtin_types_compatible_p(typeof(var), const char *) \
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? "%s\n" : "%i\n", var); \
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} while (0)
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#define sysfs_hprint(file, val) \
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do { \
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if (attr == &sysfs_ ## file) { \
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ssize_t ret = bch_hprint(buf, val); \
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strcat(buf, "\n"); \
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return ret + 1; \
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} \
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} while (0)
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#define var_printf(_var, fmt) sysfs_printf(_var, fmt, var(_var))
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#define var_print(_var) sysfs_print(_var, var(_var))
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#define var_hprint(_var) sysfs_hprint(_var, var(_var))
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#define sysfs_strtoul(file, var) \
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do { \
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if (attr == &sysfs_ ## file) \
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return strtoul_safe(buf, var) ?: (ssize_t) size; \
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} while (0)
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#define sysfs_strtoul_bool(file, var) \
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do { \
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if (attr == &sysfs_ ## file) { \
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unsigned long v = strtoul_or_return(buf); \
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\
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var = v ? 1 : 0; \
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return size; \
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} \
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} while (0)
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#define sysfs_strtoul_clamp(file, var, min, max) \
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do { \
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if (attr == &sysfs_ ## file) { \
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unsigned long v = 0; \
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ssize_t ret; \
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ret = strtoul_safe_clamp(buf, v, min, max); \
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if (!ret) { \
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var = v; \
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return size; \
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} \
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return ret; \
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} \
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} while (0)
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#define strtoul_or_return(cp) \
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({ \
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unsigned long _v; \
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int _r = kstrtoul(cp, 10, &_v); \
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if (_r) \
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return _r; \
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_v; \
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})
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#define strtoi_h_or_return(cp, v) \
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do { \
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int _r = strtoi_h(cp, &v); \
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if (_r) \
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return _r; \
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} while (0)
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#define sysfs_hatoi(file, var) \
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do { \
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if (attr == &sysfs_ ## file) \
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return strtoi_h(buf, &var) ?: (ssize_t) size; \
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} while (0)
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#endif /* _BCACHE_SYSFS_H_ */
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