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