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