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
  26 #define BTRFS_MKFS_SYSTEM_GROUP_SIZE (4 * 1024 * 1024)
  27 #define BTRFS_MKFS_SMALL_VOLUME_SIZE (1024 * 1024 * 1024)
  28 #define BTRFS_MKFS_DEFAULT_NODE_SIZE 16384
  29 #define BTRFS_MKFS_DEFAULT_FEATURES                             \
  30                 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF           \
  31                 | BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
  32
  33 /*
  34  * Avoid multi-device features (RAID56) and mixed block groups
  35  */
  36 #define BTRFS_CONVERT_ALLOWED_FEATURES                          \
  37         (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF                   \
  38         | BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL                 \
  39         | BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO                   \
  40         | BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2                 \
  41         | BTRFS_FEATURE_INCOMPAT_BIG_METADATA                   \
  42         | BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF                  \
  43         | BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA                \
  44         | BTRFS_FEATURE_INCOMPAT_NO_HOLES)
  45
  46 #define BTRFS_FEATURE_LIST_ALL          (1ULL << 63)
  47
  48 #define BTRFS_SCAN_MOUNTED      (1ULL << 0)
  49 #define BTRFS_SCAN_LBLKID       (1ULL << 1)
  50
  51 #define BTRFS_UPDATE_KERNEL     1
  52
  53 #define BTRFS_ARG_UNKNOWN       0
  54 #define BTRFS_ARG_MNTPOINT      1
  55 #define BTRFS_ARG_UUID          2
  56 #define BTRFS_ARG_BLKDEV        3
  57 #define BTRFS_ARG_REG           4
  58
  59 #define BTRFS_UUID_UNPARSED_SIZE        37
  60
  61 #define ARGV0_BUF_SIZE  PATH_MAX
  62
  63 #define GETOPT_VAL_SI                           256
  64 #define GETOPT_VAL_IEC                          257
  65 #define GETOPT_VAL_RAW                          258
  66 #define GETOPT_VAL_HUMAN_READABLE               259
  67 #define GETOPT_VAL_KBYTES                       260
  68 #define GETOPT_VAL_MBYTES                       261
  69 #define GETOPT_VAL_GBYTES                       262
  70 #define GETOPT_VAL_TBYTES                       263
  71
  72 int check_argc_exact(int nargs, int expected);
  73 int check_argc_min(int nargs, int expected);
  74 int check_argc_max(int nargs, int expected);
  75
  76 void fixup_argv0(char **argv, const char *token);
  77 void set_argv0(char **argv);
  78
  79 /*
  80  * Output modes of size
  81  */
  82 #define UNITS_RESERVED                  (0)
  83 #define UNITS_BYTES                     (1)
  84 #define UNITS_KBYTES                    (2)
  85 #define UNITS_MBYTES                    (3)
  86 #define UNITS_GBYTES                    (4)
  87 #define UNITS_TBYTES                    (5)
  88 #define UNITS_RAW                       (1U << UNITS_MODE_SHIFT)
  89 #define UNITS_BINARY                    (2U << UNITS_MODE_SHIFT)
  90 #define UNITS_DECIMAL                   (3U << UNITS_MODE_SHIFT)
  91 #define UNITS_MODE_MASK                 ((1U << UNITS_MODE_SHIFT) - 1)
  92 #define UNITS_MODE_SHIFT                (8)
  93 #define UNITS_HUMAN_BINARY              (UNITS_BINARY)
  94 #define UNITS_HUMAN_DECIMAL             (UNITS_DECIMAL)
  95 #define UNITS_HUMAN                     (UNITS_HUMAN_BINARY)
  96 #define UNITS_DEFAULT                   (UNITS_HUMAN)
  97
  98 void units_set_mode(unsigned *units, unsigned mode);
  99 void units_set_base(unsigned *units, unsigned base);
 100
 101 void btrfs_list_all_fs_features(u64 mask_disallowed);
 102 char* btrfs_parse_fs_features(char *namelist, u64 *flags);
 103 void btrfs_process_fs_features(u64 flags);
 104 void btrfs_parse_features_to_string(char *buf, u64 flags);
 105
 106 int make_btrfs(int fd, const char *device, const char *label,
 107                char *fs_uuid, u64 blocks[6], u64 num_bytes, u32 nodesize,
 108                u32 sectorsize, u32 stripesize, u64 features);
 109 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
 110                         struct btrfs_root *root, u64 objectid);
 111 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
 112                          u64 max_block_count, int *mixed, int discard);
 113 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
 114                       struct btrfs_root *root, int fd, char *path,
 115                       u64 block_count, u32 io_width, u32 io_align,
 116                       u32 sectorsize);
 117 int btrfs_scan_for_fsid(int run_ioctls);
 118 int btrfs_register_one_device(const char *fname);
 119 int btrfs_register_all_devices(void);
 120 char *canonicalize_dm_name(const char *ptname);
 121 char *canonicalize_path(const char *path);
 122 int check_mounted(const char *devicename);
 123 int check_mounted_where(int fd, const char *file, char *where, int size,
 124                         struct btrfs_fs_devices **fs_devices_mnt);
 125 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
 126                                  int super_offset);
 127
 128 int pretty_size_snprintf(u64 size, char *str, size_t str_bytes, unsigned unit_mode);
 129 #define pretty_size(size)       pretty_size_mode(size, UNITS_DEFAULT)
 130 #define pretty_size_mode(size, mode)                                          \
 131         ({                                                                    \
 132                 static __thread char _str[32];                                \
 133                 (void)pretty_size_snprintf((size), _str, sizeof(_str), (mode)); \
 134                 _str;                                                         \
 135         })
 136
 137 int get_mountpt(char *dev, char *mntpt, size_t size);
 138 u64 parse_size(char *s);
 139 u64 parse_qgroupid(const char *p);
 140 u64 arg_strtou64(const char *str);
 141 int open_file_or_dir(const char *fname, DIR **dirstream);
 142 int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags);
 143 void close_file_or_dir(int fd, DIR *dirstream);
 144 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
 145                 struct btrfs_ioctl_dev_info_args **di_ret);
 146 int get_label(const char *btrfs_dev, char *label);
 147 int set_label(const char *btrfs_dev, const char *label);
 148
 149 char *__strncpy__null(char *dest, const char *src, size_t n);
 150 int is_block_device(const char *file);
 151 int is_mount_point(const char *file);
 152 int check_arg_type(const char *input);
 153 int open_path_or_dev_mnt(const char *path, DIR **dirstream);
 154 u64 btrfs_device_size(int fd, struct stat *st);
 155 /* Helper to always get proper size of the destination string */
 156 #define strncpy_null(dest, src) __strncpy__null(dest, src, sizeof(dest))
 157 int test_dev_for_mkfs(char *file, int force_overwrite, char *estr);
 158 int get_label_mounted(const char *mount_path, char *labelp);
 159 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
 160         u64 dev_cnt, int mixed, char *estr);
 161 int group_profile_max_safe_loss(u64 flags);
 162 int is_vol_small(char *file);
 163 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
 164                            int verify);
 165 int ask_user(char *question);
 166 int lookup_ino_rootid(int fd, u64 *rootid);
 167 int btrfs_scan_lblkid(void);
 168 int get_btrfs_mount(const char *dev, char *mp, size_t mp_size);
 169 int find_mount_root(const char *path, char **mount_root);
 170 int get_device_info(int fd, u64 devid,
 171                 struct btrfs_ioctl_dev_info_args *di_args);
 172 int test_uuid_unique(char *fs_uuid);
 173 u64 disk_size(char *path);
 174 int get_device_info(int fd, u64 devid,
 175                 struct btrfs_ioctl_dev_info_args *di_args);
 176 u64 get_partition_size(char *dev);
 177 const char* group_type_str(u64 flags);
 178 const char* group_profile_str(u64 flags);
 179
 180 int test_minimum_size(const char *file, u32 leafsize);
 181 int test_issubvolname(const char *name);
 182 int test_isdir(const char *path);
 183
 184 /*
 185  * Btrfs minimum size calculation is complicated, it should include at least:
 186  * 1. system group size
 187  * 2. minimum global block reserve
 188  * 3. metadata used at mkfs
 189  * 4. space reservation to create uuid for first mount.
 190  * Also, raid factor should also be taken into consideration.
 191  * To avoid the overkill calculation, (system group + global block rsv) * 2
 192  * for *EACH* device should be good enough.
 193  */
 194 static inline u64 btrfs_min_global_blk_rsv_size(u32 leafsize)
 195 {
 196         return leafsize << 10;
 197 }
 198 static inline u64 btrfs_min_dev_size(u32 leafsize)
 199 {
 200         return 2 * (BTRFS_MKFS_SYSTEM_GROUP_SIZE +
 201                     btrfs_min_global_blk_rsv_size(leafsize));
 202 }
 203
 204 int find_next_key(struct btrfs_path *path, struct btrfs_key *key);
 205 char* btrfs_group_type_str(u64 flag);
 206 char* btrfs_group_profile_str(u64 flag);
 207
 208 /*
 209  * Get the length of the string converted from a u64 number.
 210  *
 211  * Result is equal to log10(num) + 1, but without the use of math library.
 212  */
 213 static inline int count_digits(u64 num)
 214 {
 215         int ret = 0;
 216
 217         if (num == 0)
 218                 return 1;
 219         while (num > 0) {
 220                 ret++;
 221                 num /= 10;
 222         }
 223         return ret;
 224 }
 225
 226 static inline u64 div_factor(u64 num, int factor)
 227 {
 228         if (factor == 10)
 229                 return num;
 230         num *= factor;
 231         num /= 10;
 232         return num;
 233 }
 234
 235 int btrfs_tree_search2_ioctl_supported(int fd);
 236 int btrfs_check_nodesize(u32 nodesize, u32 sectorsize);
 237
 238 #endif