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