drivers/md/bcache/sysfs.h

   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_ */