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 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, 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 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_bool(file, var)                                   \
  83 do {                                                                    \
  84         if (attr == &sysfs_ ## file) {                                  \
  85                 unsigned long v = strtoul_or_return(buf);               \
  86                                                                         \
  87                 var = v ? 1 : 0;                                        \
  88                 return size;                                            \
  89         }                                                               \
  90 } while (0)
  91
  92 #define sysfs_strtoul_clamp(file, var, min, max)                        \
  93 do {                                                                    \
  94         if (attr == &sysfs_ ## file) {                                  \
  95                 unsigned long v = 0;                                    \
  96                 ssize_t ret;                                            \
  97                 ret = strtoul_safe_clamp(buf, v, min, max);             \
  98                 if (!ret) {                                             \
  99                         var = v;                                        \
 100                         return size;                                    \
 101                 }                                                       \
 102                 return ret;                                             \
 103         }                                                               \
 104 } while (0)
 105
 106 #define strtoul_or_return(cp)                                           \
 107 ({                                                                      \
 108         unsigned long _v;                                               \
 109         int _r = kstrtoul(cp, 10, &_v);                                 \
 110         if (_r)                                                         \
 111                 return _r;                                              \
 112         _v;                                                             \
 113 })
 114
 115 #define strtoi_h_or_return(cp, v)                                       \
 116 do {                                                                    \
 117         int _r = strtoi_h(cp, &v);                                      \
 118         if (_r)                                                         \
 119                 return _r;                                              \
 120 } while (0)
 121
 122 #define sysfs_hatoi(file, var)                                          \
 123 do {                                                                    \
 124         if (attr == &sysfs_ ## file)                                    \
 125                 return strtoi_h(buf, &var) ?: (ssize_t) size;           \
 126 } while (0)
 127
 128 #endif  /* _BCACHE_SYSFS_H_ */