git.sesse.net Git - bcachefs-tools-debian/blob - libbcache/sysfs.h

   1 #ifndef _BCACHE_SYSFS_H_
   2 #define _BCACHE_SYSFS_H_
   3
   4 #include "util.h"
   5
   6 #define KTYPE(type)                                                     \
   7 struct kobj_type type ## _ktype = {                                     \
   8         .release        = type ## _release,                             \
   9         .sysfs_ops      = &((const struct sysfs_ops) {                  \
  10                 .show   = type ## _show,                                \
  11                 .store  = type ## _store                                \
  12         }),                                                             \
  13         .default_attrs  = type ## _files                                \
  14 }
  15
  16 #define SHOW(fn)                                                        \
  17 static ssize_t fn ## _show(struct kobject *kobj, struct attribute *attr,\
  18                            char *buf)                                   \
  19
  20 #define STORE(fn)                                                       \
  21 static ssize_t fn ## _store(struct kobject *kobj, struct attribute *attr,\
  22                             const char *buf, size_t size)               \
  23
  24 #define __sysfs_attribute(_name, _mode)                                 \
  25         static struct attribute sysfs_##_name =                         \
  26                 { .name = #_name, .mode = _mode }
  27
  28 #define write_attribute(n)      __sysfs_attribute(n, S_IWUSR)
  29 #define read_attribute(n)       __sysfs_attribute(n, S_IRUGO)
  30 #define rw_attribute(n)         __sysfs_attribute(n, S_IRUGO|S_IWUSR)
  31
  32 #define sysfs_printf(file, fmt, ...)                                    \
  33 do {                                                                    \
  34         if (attr == &sysfs_ ## file)                                    \
  35                 return snprintf(buf, PAGE_SIZE, fmt "\n", __VA_ARGS__); \
  36 } while (0)
  37
  38 #define sysfs_print(file, var)                                          \
  39 do {                                                                    \
  40         if (attr == &sysfs_ ## file)                                    \
  41                 return snprint(buf, PAGE_SIZE, var);                    \
  42 } while (0)
  43
  44 #define sysfs_hprint(file, val)                                         \
  45 do {                                                                    \
  46         if (attr == &sysfs_ ## file) {                                  \
  47                 ssize_t ret = bch_hprint(buf, val);                     \
  48                 strcat(buf, "\n");                                      \
  49                 return ret + 1;                                         \
  50         }                                                               \
  51 } while (0)
  52
  53 #define var_printf(_var, fmt)   sysfs_printf(_var, fmt, var(_var))
  54 #define var_print(_var)         sysfs_print(_var, var(_var))
  55 #define var_hprint(_var)        sysfs_hprint(_var, var(_var))
  56
  57 #define sysfs_strtoul(file, var)                                        \
  58 do {                                                                    \
  59         if (attr == &sysfs_ ## file)                                    \
  60                 return strtoul_safe(buf, var) ?: (ssize_t) size;        \
  61 } while (0)
  62
  63 #define sysfs_strtoul_clamp(file, var, min, max)                        \
  64 do {                                                                    \
  65         if (attr == &sysfs_ ## file)                                    \
  66                 return strtoul_safe_clamp(buf, var, min, max)           \
  67                         ?: (ssize_t) size;                              \
  68 } while (0)
  69
  70 #define strtoul_or_return(cp)                                           \
  71 ({                                                                      \
  72         unsigned long _v;                                               \
  73         int _r = kstrtoul(cp, 10, &_v);                                 \
  74         if (_r)                                                         \
  75                 return _r;                                              \
  76         _v;                                                             \
  77 })
  78
  79 #define strtoul_restrict_or_return(cp, min, max)                        \
  80 ({                                                                      \
  81         unsigned long __v = 0;                                          \
  82         int _r = strtoul_safe_restrict(cp, __v, min, max);              \
  83         if (_r)                                                         \
  84                 return _r;                                              \
  85         __v;                                                            \
  86 })
  87
  88 #define strtoi_h_or_return(cp)                                          \
  89 ({                                                                      \
  90         u64 _v;                                                         \
  91         int _r = strtoi_h(cp, &_v);                                     \
  92         if (_r)                                                         \
  93                 return _r;                                              \
  94         _v;                                                             \
  95 })
  96
  97 #define sysfs_hatoi(file, var)                                          \
  98 do {                                                                    \
  99         if (attr == &sysfs_ ## file)                                    \
 100                 return strtoi_h(buf, &var) ?: (ssize_t) size;           \
 101 } while (0)
 102
 103 #endif  /* _BCACHE_SYSFS_H_ */