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 int open_for_format(const char *, bool);
  68
  69 bool ask_yn(void);
  70
  71 struct range {
  72         u64             start;
  73         u64             end;
  74 };
  75
  76 typedef DARRAY(struct range) ranges;
  77
  78 static inline void range_add(ranges *data, u64 offset, u64 size)
  79 {
  80         darray_push(data, ((struct range) {
  81                 .start = offset,
  82                 .end = offset + size
  83         }));
  84 }
  85
  86 void ranges_sort_merge(ranges *);
  87 void ranges_roundup(ranges *, unsigned);
  88 void ranges_rounddown(ranges *, unsigned);
  89
  90 struct hole_iter {
  91         ranges          r;
  92         size_t          idx;
  93         u64             end;
  94 };
  95
  96 static inline struct range hole_iter_next(struct hole_iter *iter)
  97 {
  98         struct range r = {
  99                 .start  = iter->idx ? iter->r.data[iter->idx - 1].end : 0,
 100                 .end    = iter->idx < iter->r.nr
 101                         ? iter->r.data[iter->idx].start : iter->end,
 102         };
 103
 104         BUG_ON(r.start > r.end);
 105
 106         iter->idx++;
 107         return r;
 108 }
 109
 110 #define for_each_hole(_iter, _ranges, _end, _i)                         \
 111         for (_iter = (struct hole_iter) { .r = _ranges, .end = _end };  \
 112              (_iter.idx <= _iter.r.nr &&                                \
 113               (_i = hole_iter_next(&_iter), true));)
 114
 115 #include <linux/fiemap.h>
 116
 117 struct fiemap_iter {
 118         struct fiemap           *f;
 119         unsigned                idx;
 120         int                     fd;
 121 };
 122
 123 static inline void fiemap_iter_init(struct fiemap_iter *iter, int fd)
 124 {
 125         memset(iter, 0, sizeof(*iter));
 126
 127         iter->f = xmalloc(sizeof(struct fiemap) +
 128                           sizeof(struct fiemap_extent) * 1024);
 129
 130         iter->f->fm_extent_count        = 1024;
 131         iter->f->fm_length      = FIEMAP_MAX_OFFSET;
 132         iter->fd                = fd;
 133 }
 134
 135 static inline void fiemap_iter_exit(struct fiemap_iter *iter)
 136 {
 137         free(iter->f);
 138         memset(iter, 0, sizeof(*iter));
 139 }
 140
 141 struct fiemap_extent fiemap_iter_next(struct fiemap_iter *);
 142
 143 #define fiemap_for_each(fd, iter, extent)                               \
 144         for (fiemap_iter_init(&iter, fd);                               \
 145              (extent = fiemap_iter_next(&iter)).fe_length;)
 146
 147 char *strcmp_prefix(char *, const char *);
 148
 149 u32 crc32c(u32, const void *, size_t);
 150
 151 char *dev_to_name(dev_t);
 152 char *dev_to_path(dev_t);
 153 struct mntent *dev_to_mount(char *);
 154 int dev_mounted(char *);
 155
 156 #define args_shift(_nr)                                                 \
 157 do {                                                                    \
 158         unsigned _n = min((_nr), argc);                                 \
 159         argc -= _n;                                                     \
 160         argv += _n;                                                     \
 161 } while (0)
 162
 163 #define arg_pop()                                                       \
 164 ({                                                                      \
 165         char *_ret = argc ? argv[0] : NULL;                             \
 166         if (_ret)                                                       \
 167                 args_shift(1);                                          \
 168         _ret;                                                           \
 169 })
 170
 171 struct bpos bpos_parse(char *);
 172 struct bbpos bbpos_parse(char *);
 173
 174 #endif /* _TOOLS_UTIL_H */