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