utils.h

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #ifndef __BTRFS_UTILS_H__
  20 #define __BTRFS_UTILS_H__
  21
  22 #include <sys/stat.h>
  23 #include "ctree.h"
  24 #include <dirent.h>
  25 #include <stdarg.h>
  26 #include "internal.h"
  27 #include "btrfs-list.h"
  28
  29 #define BTRFS_MKFS_SYSTEM_GROUP_SIZE (4 * 1024 * 1024)
  30 #define BTRFS_MKFS_SMALL_VOLUME_SIZE (1024 * 1024 * 1024)
  31 #define BTRFS_MKFS_DEFAULT_NODE_SIZE 16384
  32 #define BTRFS_MKFS_DEFAULT_FEATURES                             \
  33                 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF           \
  34                 | BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
  35
  36 /*
  37  * Avoid multi-device features (RAID56) and mixed block groups
  38  */
  39 #define BTRFS_CONVERT_ALLOWED_FEATURES                          \
  40         (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF                   \
  41         | BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL                 \
  42         | BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO                   \
  43         | BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2                 \
  44         | BTRFS_FEATURE_INCOMPAT_BIG_METADATA                   \
  45         | BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF                  \
  46         | BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA                \
  47         | BTRFS_FEATURE_INCOMPAT_NO_HOLES)
  48
  49 #define BTRFS_FEATURE_LIST_ALL          (1ULL << 63)
  50
  51 #define BTRFS_SCAN_MOUNTED      (1ULL << 0)
  52 #define BTRFS_SCAN_LBLKID       (1ULL << 1)
  53
  54 #define BTRFS_UPDATE_KERNEL     1
  55
  56 #define BTRFS_ARG_UNKNOWN       0
  57 #define BTRFS_ARG_MNTPOINT      1
  58 #define BTRFS_ARG_UUID          2
  59 #define BTRFS_ARG_BLKDEV        3
  60 #define BTRFS_ARG_REG           4
  61
  62 #define BTRFS_UUID_UNPARSED_SIZE        37
  63
  64 #define ARGV0_BUF_SIZE  PATH_MAX
  65
  66 #define GETOPT_VAL_SI                           256
  67 #define GETOPT_VAL_IEC                          257
  68 #define GETOPT_VAL_RAW                          258
  69 #define GETOPT_VAL_HUMAN_READABLE               259
  70 #define GETOPT_VAL_KBYTES                       260
  71 #define GETOPT_VAL_MBYTES                       261
  72 #define GETOPT_VAL_GBYTES                       262
  73 #define GETOPT_VAL_TBYTES                       263
  74
  75 #define GETOPT_VAL_HELP                         270
  76
  77 int check_argc_exact(int nargs, int expected);
  78 int check_argc_min(int nargs, int expected);
  79 int check_argc_max(int nargs, int expected);
  80
  81 void fixup_argv0(char **argv, const char *token);
  82 void set_argv0(char **argv);
  83
  84 /*
  85  * Output modes of size
  86  */
  87 #define UNITS_RESERVED                  (0)
  88 #define UNITS_BYTES                     (1)
  89 #define UNITS_KBYTES                    (2)
  90 #define UNITS_MBYTES                    (3)
  91 #define UNITS_GBYTES                    (4)
  92 #define UNITS_TBYTES                    (5)
  93 #define UNITS_RAW                       (1U << UNITS_MODE_SHIFT)
  94 #define UNITS_BINARY                    (2U << UNITS_MODE_SHIFT)
  95 #define UNITS_DECIMAL                   (3U << UNITS_MODE_SHIFT)
  96 #define UNITS_MODE_MASK                 ((1U << UNITS_MODE_SHIFT) - 1)
  97 #define UNITS_MODE_SHIFT                (8)
  98 #define UNITS_HUMAN_BINARY              (UNITS_BINARY)
  99 #define UNITS_HUMAN_DECIMAL             (UNITS_DECIMAL)
 100 #define UNITS_HUMAN                     (UNITS_HUMAN_BINARY)
 101 #define UNITS_DEFAULT                   (UNITS_HUMAN)
 102
 103 void units_set_mode(unsigned *units, unsigned mode);
 104 void units_set_base(unsigned *units, unsigned base);
 105
 106 void btrfs_list_all_fs_features(u64 mask_disallowed);
 107 char* btrfs_parse_fs_features(char *namelist, u64 *flags);
 108 void btrfs_process_fs_features(u64 flags);
 109 void btrfs_parse_features_to_string(char *buf, u64 flags);
 110
 111 struct btrfs_mkfs_config {
 112         char *label;
 113         char *fs_uuid;
 114         char *chunk_uuid;
 115         u64 blocks[8];
 116         u64 num_bytes;
 117         u32 nodesize;
 118         u32 sectorsize;
 119         u32 stripesize;
 120         u64 features;
 121
 122         /* Super bytenr after make_btrfs */
 123         u64 super_bytenr;
 124 };
 125
 126 int make_btrfs(int fd, struct btrfs_mkfs_config *cfg);
 127 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
 128                         struct btrfs_root *root, u64 objectid);
 129 int btrfs_prepare_device(int fd, const char *file, int zero_end,
 130                 u64 *block_count_ret, u64 max_block_count, int discard);
 131 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
 132                       struct btrfs_root *root, int fd, char *path,
 133                       u64 block_count, u32 io_width, u32 io_align,
 134                       u32 sectorsize);
 135 int btrfs_scan_for_fsid(int run_ioctls);
 136 int btrfs_register_one_device(const char *fname);
 137 int btrfs_register_all_devices(void);
 138 char *canonicalize_dm_name(const char *ptname);
 139 char *canonicalize_path(const char *path);
 140 int check_mounted(const char *devicename);
 141 int check_mounted_where(int fd, const char *file, char *where, int size,
 142                         struct btrfs_fs_devices **fs_devices_mnt);
 143 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
 144                                  int super_offset);
 145
 146 int pretty_size_snprintf(u64 size, char *str, size_t str_bytes, unsigned unit_mode);
 147 #define pretty_size(size)       pretty_size_mode(size, UNITS_DEFAULT)
 148 const char *pretty_size_mode(u64 size, unsigned mode);
 149
 150 int get_mountpt(char *dev, char *mntpt, size_t size);
 151 u64 parse_size(char *s);
 152 u64 parse_qgroupid(const char *p);
 153 u64 arg_strtou64(const char *str);
 154 int arg_copy_path(char *dest, const char *src, int destlen);
 155 int open_file_or_dir(const char *fname, DIR **dirstream);
 156 int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags);
 157 void close_file_or_dir(int fd, DIR *dirstream);
 158 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
 159                 struct btrfs_ioctl_dev_info_args **di_ret);
 160 int get_label(const char *btrfs_dev, char *label);
 161 int set_label(const char *btrfs_dev, const char *label);
 162
 163 char *__strncpy_null(char *dest, const char *src, size_t n);
 164 int is_block_device(const char *file);
 165 int is_mount_point(const char *file);
 166 int check_arg_type(const char *input);
 167 int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose);
 168 int btrfs_open_dir(const char *path, DIR **dirstream, int verbose);
 169 u64 btrfs_device_size(int fd, struct stat *st);
 170 /* Helper to always get proper size of the destination string */
 171 #define strncpy_null(dest, src) __strncpy_null(dest, src, sizeof(dest))
 172 int test_dev_for_mkfs(const char *file, int force_overwrite);
 173 int get_label_mounted(const char *mount_path, char *labelp);
 174 int get_label_unmounted(const char *dev, char *label);
 175 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
 176         u64 dev_cnt, int mixed, int ssd);
 177 int group_profile_max_safe_loss(u64 flags);
 178 int is_vol_small(const char *file);
 179 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
 180                            int verify);
 181 int ask_user(const char *question);
 182 int lookup_ino_rootid(int fd, u64 *rootid);
 183 int btrfs_scan_lblkid(void);
 184 int get_btrfs_mount(const char *dev, char *mp, size_t mp_size);
 185 int find_mount_root(const char *path, char **mount_root);
 186 int get_device_info(int fd, u64 devid,
 187                 struct btrfs_ioctl_dev_info_args *di_args);
 188 int test_uuid_unique(char *fs_uuid);
 189 u64 disk_size(const char *path);
 190 int get_device_info(int fd, u64 devid,
 191                 struct btrfs_ioctl_dev_info_args *di_args);
 192 u64 get_partition_size(const char *dev);
 193
 194 int test_minimum_size(const char *file, u32 leafsize);
 195 int test_issubvolname(const char *name);
 196 int test_issubvolume(const char *path);
 197 int test_isdir(const char *path);
 198
 199 const char *subvol_strip_mountpoint(const char *mnt, const char *full_path);
 200 int get_subvol_info(const char *fullpath, struct root_info *get_ri);
 201
 202 /*
 203  * Btrfs minimum size calculation is complicated, it should include at least:
 204  * 1. system group size
 205  * 2. minimum global block reserve
 206  * 3. metadata used at mkfs
 207  * 4. space reservation to create uuid for first mount.
 208  * Also, raid factor should also be taken into consideration.
 209  * To avoid the overkill calculation, (system group + global block rsv) * 2
 210  * for *EACH* device should be good enough.
 211  */
 212 static inline u64 btrfs_min_global_blk_rsv_size(u32 leafsize)
 213 {
 214         return leafsize << 10;
 215 }
 216 static inline u64 btrfs_min_dev_size(u32 leafsize)
 217 {
 218         return 2 * (BTRFS_MKFS_SYSTEM_GROUP_SIZE +
 219                     btrfs_min_global_blk_rsv_size(leafsize));
 220 }
 221
 222 int find_next_key(struct btrfs_path *path, struct btrfs_key *key);
 223 const char* btrfs_group_type_str(u64 flag);
 224 const char* btrfs_group_profile_str(u64 flag);
 225
 226 /*
 227  * Get the length of the string converted from a u64 number.
 228  *
 229  * Result is equal to log10(num) + 1, but without the use of math library.
 230  */
 231 static inline int count_digits(u64 num)
 232 {
 233         int ret = 0;
 234
 235         if (num == 0)
 236                 return 1;
 237         while (num > 0) {
 238                 ret++;
 239                 num /= 10;
 240         }
 241         return ret;
 242 }
 243
 244 static inline u64 div_factor(u64 num, int factor)
 245 {
 246         if (factor == 10)
 247                 return num;
 248         num *= factor;
 249         num /= 10;
 250         return num;
 251 }
 252
 253 int btrfs_tree_search2_ioctl_supported(int fd);
 254 int btrfs_check_nodesize(u32 nodesize, u32 sectorsize, u64 features);
 255
 256 const char *get_argv0_buf(void);
 257
 258 #define HELPINFO_UNITS_LONG                                                     \
 259         "--raw              raw numbers in bytes",                              \
 260         "--human-readable   human friendly numbers, base 1024 (default)",       \
 261         "--iec              use 1024 as a base (KiB, MiB, GiB, TiB)",           \
 262         "--si               use 1000 as a base (kB, MB, GB, TB)",               \
 263         "--kbytes           show sizes in KiB, or kB with --si",                \
 264         "--mbytes           show sizes in MiB, or MB with --si",                \
 265         "--gbytes           show sizes in GiB, or GB with --si",                \
 266         "--tbytes           show sizes in TiB, or TB with --si"
 267
 268 #define HELPINFO_UNITS_SHORT_LONG                                               \
 269         "-b|--raw           raw numbers in bytes",                              \
 270         "-h|--human-readable",                                                  \
 271         "                   human friendly numbers, base 1024 (default)",       \
 272         "-H                 human friendly numbers, base 1000",                 \
 273         "--iec              use 1024 as a base (KiB, MiB, GiB, TiB)",           \
 274         "--si               use 1000 as a base (kB, MB, GB, TB)",               \
 275         "-k|--kbytes        show sizes in KiB, or kB with --si",                \
 276         "-m|--mbytes        show sizes in MiB, or MB with --si",                \
 277         "-g|--gbytes        show sizes in GiB, or GB with --si",                \
 278         "-t|--tbytes        show sizes in TiB, or TB with --si"
 279
 280 unsigned int get_unit_mode_from_arg(int *argc, char *argv[], int df_mode);
 281 void clean_args_no_options(int argc, char *argv[], const char * const *usage);
 282 int string_is_numerical(const char *str);
 283
 284 __attribute__ ((format (printf, 1, 2)))
 285 static inline void warning(const char *fmt, ...)
 286 {
 287         va_list args;
 288
 289         fputs("WARNING: ", stderr);
 290         va_start(args, fmt);
 291         vfprintf(stderr, fmt, args);
 292         va_end(args);
 293         fputc('\n', stderr);
 294 }
 295
 296 __attribute__ ((format (printf, 1, 2)))
 297 static inline void error(const char *fmt, ...)
 298 {
 299         va_list args;
 300
 301         fputs("ERROR: ", stderr);
 302         va_start(args, fmt);
 303         vfprintf(stderr, fmt, args);
 304         va_end(args);
 305         fputc('\n', stderr);
 306 }
 307
 308 __attribute__ ((format (printf, 2, 3)))
 309 static inline int warning_on(int condition, const char *fmt, ...)
 310 {
 311         va_list args;
 312
 313         if (!condition)
 314                 return 0;
 315
 316         fputs("WARNING: ", stderr);
 317         va_start(args, fmt);
 318         vfprintf(stderr, fmt, args);
 319         va_end(args);
 320         fputc('\n', stderr);
 321
 322         return 1;
 323 }
 324
 325 __attribute__ ((format (printf, 2, 3)))
 326 static inline int error_on(int condition, const char *fmt, ...)
 327 {
 328         va_list args;
 329
 330         if (!condition)
 331                 return 0;
 332
 333         fputs("ERROR: ", stderr);
 334         va_start(args, fmt);
 335         vfprintf(stderr, fmt, args);
 336         va_end(args);
 337         fputc('\n', stderr);
 338
 339         return 1;
 340 }
 341
 342 #endif