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