| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _BCACHE_SYSFS_H_ |
| 3 | #define _BCACHE_SYSFS_H_ |
| 4 | |
| 5 | #define KTYPE(type) \ |
| 6 | 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_attrs = type ## _files \ |
| 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, S_IWUSR) |
| 48 | #define read_attribute(n) __sysfs_attribute(n, S_IRUGO) |
| 49 | #define rw_attribute(n) __sysfs_attribute(n, S_IRUGO|S_IWUSR) |
| 50 | |
| 51 | #define sysfs_printf(file, fmt, ...) \ |
| 52 | do { \ |
| 53 | if (attr == &sysfs_ ## file) \ |
| 54 | return snprintf(buf, PAGE_SIZE, fmt "\n", __VA_ARGS__); \ |
| 55 | } while (0) |
| 56 | |
| 57 | #define sysfs_print(file, var) \ |
| 58 | do { \ |
| 59 | if (attr == &sysfs_ ## file) \ |
| 60 | return snprint(buf, PAGE_SIZE, var); \ |
| 61 | } while (0) |
| 62 | |
| 63 | #define sysfs_hprint(file, val) \ |
| 64 | do { \ |
| 65 | if (attr == &sysfs_ ## file) { \ |
| 66 | ssize_t ret = bch_hprint(buf, val); \ |
| 67 | strcat(buf, "\n"); \ |
| 68 | return ret + 1; \ |
| 69 | } \ |
| 70 | } while (0) |
| 71 | |
| 72 | #define var_printf(_var, fmt) sysfs_printf(_var, fmt, var(_var)) |
| 73 | #define var_print(_var) sysfs_print(_var, var(_var)) |
| 74 | #define var_hprint(_var) sysfs_hprint(_var, var(_var)) |
| 75 | |
| 76 | #define sysfs_strtoul(file, var) \ |
| 77 | do { \ |
| 78 | if (attr == &sysfs_ ## file) \ |
| 79 | return strtoul_safe(buf, var) ?: (ssize_t) size; \ |
| 80 | } while (0) |
| 81 | |
| 82 | #define sysfs_strtoul_clamp(file, var, min, max) \ |
| 83 | do { \ |
| 84 | if (attr == &sysfs_ ## file) { \ |
| 85 | unsigned long v = 0; \ |
| 86 | ssize_t ret; \ |
| 87 | ret = strtoul_safe_clamp(buf, v, min, max); \ |
| 88 | if (!ret) { \ |
| 89 | var = v; \ |
| 90 | return size; \ |
| 91 | } \ |
| 92 | return ret; \ |
| 93 | } \ |
| 94 | } while (0) |
| 95 | |
| 96 | #define strtoul_or_return(cp) \ |
| 97 | ({ \ |
| 98 | unsigned long _v; \ |
| 99 | int _r = kstrtoul(cp, 10, &_v); \ |
| 100 | if (_r) \ |
| 101 | return _r; \ |
| 102 | _v; \ |
| 103 | }) |
| 104 | |
| 105 | #define strtoi_h_or_return(cp, v) \ |
| 106 | do { \ |
| 107 | int _r = strtoi_h(cp, &v); \ |
| 108 | if (_r) \ |
| 109 | return _r; \ |
| 110 | } while (0) |
| 111 | |
| 112 | #define sysfs_hatoi(file, var) \ |
| 113 | do { \ |
| 114 | if (attr == &sysfs_ ## file) \ |
| 115 | return strtoi_h(buf, &var) ?: (ssize_t) size; \ |
| 116 | } while (0) |
| 117 | |
| 118 | #endif /* _BCACHE_SYSFS_H_ */ |