1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _BCACHE_SYSFS_H_ 3 #define _BCACHE_SYSFS_H_ 4 5 #define KTYPE(type) \ 6 const struct kobj_type type ## _ktype = { \ 7 .release = type ## _release, \ 8 .sysfs_ops = &((const struct sysfs_ops) { \ 9 .show = type ## _show, \ 10 .store = type ## _store \ 11 }), \ 12 .default_groups = type ## _groups \ 13 } 14 15 #define SHOW(fn) \ 16 static ssize_t fn ## _show(struct kobject *kobj, struct attribute *attr,\ 17 char *buf) \ 18 19 #define STORE(fn) \ 20 static ssize_t fn ## _store(struct kobject *kobj, struct attribute *attr,\ 21 const char *buf, size_t size) \ 22 23 #define SHOW_LOCKED(fn) \ 24 SHOW(fn) \ 25 { \ 26 ssize_t ret; \ 27 mutex_lock(&bch_register_lock); \ 28 ret = __ ## fn ## _show(kobj, attr, buf); \ 29 mutex_unlock(&bch_register_lock); \ 30 return ret; \ 31 } 32 33 #define STORE_LOCKED(fn) \ 34 STORE(fn) \ 35 { \ 36 ssize_t ret; \ 37 mutex_lock(&bch_register_lock); \ 38 ret = __ ## fn ## _store(kobj, attr, buf, size); \ 39 mutex_unlock(&bch_register_lock); \ 40 return ret; \ 41 } 42 43 #define __sysfs_attribute(_name, _mode) \ 44 static struct attribute sysfs_##_name = \ 45 { .name = #_name, .mode = _mode } 46 47 #define write_attribute(n) __sysfs_attribute(n, 0200) 48 #define read_attribute(n) __sysfs_attribute(n, 0444) 49 #define rw_attribute(n) __sysfs_attribute(n, 0644) 50 51 #define sysfs_printf(file, fmt, ...) \ 52 do { \ 53 if (attr == &sysfs_ ## file) \ 54 return sysfs_emit(buf, fmt "\n", __VA_ARGS__); \ 55 } while (0) 56 57 #define sysfs_print(file, var) \ 58 do { \ 59 if (attr == &sysfs_ ## file) \ 60 return sysfs_emit(buf, \ 61 __builtin_types_compatible_p(typeof(var), int) \ 62 ? "%i\n" : \ 63 __builtin_types_compatible_p(typeof(var), unsigned int) \ 64 ? "%u\n" : \ 65 __builtin_types_compatible_p(typeof(var), long) \ 66 ? "%li\n" : \ 67 __builtin_types_compatible_p(typeof(var), unsigned long)\ 68 ? "%lu\n" : \ 69 __builtin_types_compatible_p(typeof(var), int64_t) \ 70 ? "%lli\n" : \ 71 __builtin_types_compatible_p(typeof(var), uint64_t) \ 72 ? "%llu\n" : \ 73 __builtin_types_compatible_p(typeof(var), const char *) \ 74 ? "%s\n" : "%i\n", var); \ 75 } while (0) 76 77 #define sysfs_hprint(file, val) \ 78 do { \ 79 if (attr == &sysfs_ ## file) { \ 80 ssize_t ret = bch_hprint(buf, val); \ 81 strcat(buf, "\n"); \ 82 return ret + 1; \ 83 } \ 84 } while (0) 85 86 #define var_printf(_var, fmt) sysfs_printf(_var, fmt, var(_var)) 87 #define var_print(_var) sysfs_print(_var, var(_var)) 88 #define var_hprint(_var) sysfs_hprint(_var, var(_var)) 89 90 #define sysfs_strtoul(file, var) \ 91 do { \ 92 if (attr == &sysfs_ ## file) \ 93 return strtoul_safe(buf, var) ?: (ssize_t) size; \ 94 } while (0) 95 96 #define sysfs_strtoul_bool(file, var) \ 97 do { \ 98 if (attr == &sysfs_ ## file) { \ 99 unsigned long v = strtoul_or_return(buf); \ 100 \ 101 var = v ? 1 : 0; \ 102 return size; \ 103 } \ 104 } while (0) 105 106 #define sysfs_strtoul_clamp(file, var, min, max) \ 107 do { \ 108 if (attr == &sysfs_ ## file) { \ 109 unsigned long v = 0; \ 110 ssize_t ret; \ 111 ret = strtoul_safe_clamp(buf, v, min, max); \ 112 if (!ret) { \ 113 var = v; \ 114 return size; \ 115 } \ 116 return ret; \ 117 } \ 118 } while (0) 119 120 #define strtoul_or_return(cp) \ 121 ({ \ 122 unsigned long _v; \ 123 int _r = kstrtoul(cp, 10, &_v); \ 124 if (_r) \ 125 return _r; \ 126 _v; \ 127 }) 128 129 #define strtoi_h_or_return(cp, v) \ 130 do { \ 131 int _r = strtoi_h(cp, &v); \ 132 if (_r) \ 133 return _r; \ 134 } while (0) 135 136 #define sysfs_hatoi(file, var) \ 137 do { \ 138 if (attr == &sysfs_ ## file) \ 139 return strtoi_h(buf, &var) ?: (ssize_t) size; \ 140 } while (0) 141 142 #endif /* _BCACHE_SYSFS_H_ */ 143