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

   1 #ifndef _TOOLS_UTIL_H
   2 #define _TOOLS_UTIL_H
   3
   4 #include <errno.h>
   5 #include <mntent.h>
   6 #include <stdbool.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <sys/ioctl.h>
  10 #include <sys/stat.h>
  11 #include <sys/types.h>
  12 #include <unistd.h>
  13
  14 #include <linux/bug.h>
  15 #include <linux/byteorder.h>
  16 #include <linux/kernel.h>
  17 #include <linux/log2.h>
  18 #include <linux/string.h>
  19 #include <linux/types.h>
  20 #include <linux/uuid.h>
  21 #include "ccan/darray/darray.h"
  22
  23 #define noreturn __attribute__((noreturn))
  24
  25 void die(const char *, ...) __attribute__((format(printf, 1, 2))) noreturn;
  26 char *mprintf(const char *, ...)
  27         __attribute__ ((format (printf, 1, 2)));
  28 void *xcalloc(size_t, size_t);
  29 void *xmalloc(size_t);
  30 void *xrealloc(void *, size_t);
  31 void xpread(int, void *, size_t, off_t);
  32 void xpwrite(int, const void *, size_t, off_t);
  33 struct stat xfstatat(int, const char *, int);
  34 struct stat xfstat(int);
  35 struct stat xstat(const char *);
  36
  37 #define xopenat(_dirfd, _path, ...)                                     \
  38 ({                                                                      \
  39         int _fd = openat((_dirfd), (_path), __VA_ARGS__);               \
  40         if (_fd < 0)                                                    \
  41                 die("Error opening %s: %m", (_path));                   \
  42         _fd;                                                            \
  43 })
  44
  45 #define xopen(...)      xopenat(AT_FDCWD, __VA_ARGS__)
  46
  47 #define xioctl(_fd, _nr, ...)                                           \
  48 ({                                                                      \
  49         int _ret = ioctl((_fd), (_nr), ##__VA_ARGS__);                  \
  50         if (_ret < 0)                                                   \
  51                 die(#_nr " ioctl error: %m");                           \
  52         _ret;                                                           \
  53 })
  54
  55 int printf_pad(unsigned pad, const char * fmt, ...);
  56
  57 enum units {
  58         BYTES,
  59         SECTORS,
  60         HUMAN_READABLE,
  61 };
  62
  63 struct units_buf __pr_units(s64, enum units);
  64
  65 struct units_buf {
  66         char    b[20];
  67 };
  68
  69 #define pr_units(_v, _u)        &(__pr_units(_v, _u).b[0])
  70
  71 char *read_file_str(int, const char *);
  72 u64 read_file_u64(int, const char *);
  73
  74 ssize_t read_string_list_or_die(const char *, const char * const[],
  75                                 const char *);
  76
  77 u64 get_size(const char *, int);
  78 unsigned get_blocksize(const char *, int);
  79 int open_for_format(const char *, bool);
  80
  81 bool ask_yn(void);
  82
  83 struct range {
  84         u64             start;
  85         u64             end;
  86 };
  87
  88 typedef darray(struct range) ranges;
  89
  90 static inline void range_add(ranges *data, u64 offset, u64 size)
  91 {
  92         darray_append(*data, (struct range) {
  93                 .start = offset,
  94                 .end = offset + size
  95         });
  96 }
  97
  98 void ranges_sort_merge(ranges *);
  99 void ranges_roundup(ranges *, unsigned);
 100 void ranges_rounddown(ranges *, unsigned);
 101
 102 struct hole_iter {
 103         ranges          r;
 104         size_t          idx;
 105         u64             end;
 106 };
 107
 108 static inline struct range hole_iter_next(struct hole_iter *iter)
 109 {
 110         struct range r = {
 111                 .start  = iter->idx ? iter->r.item[iter->idx - 1].end : 0,
 112                 .end    = iter->idx < iter->r.size
 113                         ? iter->r.item[iter->idx].start : iter->end,
 114         };
 115
 116         BUG_ON(r.start > r.end);
 117
 118         iter->idx++;
 119         return r;
 120 }
 121
 122 #define for_each_hole(_iter, _ranges, _end, _i)                         \
 123         for (_iter = (struct hole_iter) { .r = _ranges, .end = _end };  \
 124              (_iter.idx <= _iter.r.size &&                              \
 125               (_i = hole_iter_next(&_iter), true));)
 126
 127 #include <linux/fiemap.h>
 128
 129 struct fiemap_iter {
 130         struct fiemap           f;
 131         struct fiemap_extent    fe[1024];
 132         unsigned                idx;
 133         int                     fd;
 134 };
 135
 136 static inline void fiemap_iter_init(struct fiemap_iter *iter, int fd)
 137 {
 138         memset(iter, 0, sizeof(*iter));
 139
 140         iter->f.fm_extent_count = ARRAY_SIZE(iter->fe);
 141         iter->f.fm_length       = FIEMAP_MAX_OFFSET;
 142         iter->fd                = fd;
 143 }
 144
 145 struct fiemap_extent fiemap_iter_next(struct fiemap_iter *);
 146
 147 #define fiemap_for_each(fd, iter, extent)                               \
 148         for (fiemap_iter_init(&iter, fd);                               \
 149              (extent = fiemap_iter_next(&iter)).fe_length;)
 150
 151 char *strcmp_prefix(char *, const char *);
 152
 153 unsigned hatoi_validate(const char *, const char *);
 154
 155 u32 crc32c(u32, const void *, size_t);
 156
 157 char *dev_to_name(dev_t);
 158 char *dev_to_path(dev_t);
 159 struct mntent *dev_to_mount(char *);
 160 int dev_mounted(char *);
 161
 162 #define args_shift(_nr)                                                 \
 163 do {                                                                    \
 164         unsigned _n = min((_nr), argc);                                 \
 165         argc -= _n;                                                     \
 166         argv += _n;                                                     \
 167 } while (0)
 168
 169 #define arg_pop()                                                       \
 170 ({                                                                      \
 171         char *_ret = argc ? argv[0] : NULL;                             \
 172         if (_ret)                                                       \
 173                 args_shift(1);                                          \
 174         _ret;                                                           \
 175 })
 176
 177 struct bpos bpos_parse(char *);
 178
 179 #endif /* _TOOLS_UTIL_H */