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 __UTILS__
  20 #define __UTILS__
  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
  29 #define BTRFS_SCAN_PROC         (1ULL << 0)
  30 #define BTRFS_SCAN_DEV          (1ULL << 1)
  31 #define BTRFS_SCAN_MOUNTED      (1ULL << 2)
  32 #define BTRFS_SCAN_LBLKID       (1ULL << 3)
  33
  34 #define BTRFS_UPDATE_KERNEL     1
  35
  36 #define BTRFS_ARG_UNKNOWN       0
  37 #define BTRFS_ARG_MNTPOINT      1
  38 #define BTRFS_ARG_UUID          2
  39 #define BTRFS_ARG_BLKDEV        3
  40
  41 #define BTRFS_UUID_UNPARSED_SIZE        37
  42
  43 #define ARGV0_BUF_SIZE  64
  44
  45 int check_argc_exact(int nargs, int expected);
  46 int check_argc_min(int nargs, int expected);
  47 int check_argc_max(int nargs, int expected);
  48
  49 void fixup_argv0(char **argv, const char *token);
  50 void set_argv0(char **argv);
  51
  52 int make_btrfs(int fd, const char *device, const char *label,
  53                char *fs_uuid, u64 blocks[6], u64 num_bytes, u32 nodesize,
  54                u32 leafsize, u32 sectorsize, u32 stripesize, u64 features);
  55 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
  56                         struct btrfs_root *root, u64 objectid);
  57 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
  58                          u64 max_block_count, int *mixed, int discard);
  59 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
  60                       struct btrfs_root *root, int fd, char *path,
  61                       u64 block_count, u32 io_width, u32 io_align,
  62                       u32 sectorsize);
  63 int btrfs_scan_for_fsid(int run_ioctls);
  64 void btrfs_register_one_device(char *fname);
  65 int btrfs_scan_one_dir(char *dirname, int run_ioctl);
  66 char *canonicalize_dm_name(const char *ptname);
  67 char *canonicalize_path(const char *path);
  68 int check_mounted(const char *devicename);
  69 int check_mounted_where(int fd, const char *file, char *where, int size,
  70                         struct btrfs_fs_devices **fs_devices_mnt);
  71 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
  72                                  int super_offset);
  73
  74 int pretty_size_snprintf(u64 size, char *str, size_t str_bytes);
  75 #define pretty_size(size)                                               \
  76         ({                                                              \
  77                 static __thread char _str[24];                          \
  78                 (void)pretty_size_snprintf((size), _str, sizeof(_str)); \
  79                 _str;                                                   \
  80         })
  81
  82 int get_mountpt(char *dev, char *mntpt, size_t size);
  83 int btrfs_scan_block_devices(int run_ioctl);
  84 u64 parse_size(char *s);
  85 u64 arg_strtou64(const char *str);
  86 int open_file_or_dir(const char *fname, DIR **dirstream);
  87 int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags);
  88 void close_file_or_dir(int fd, DIR *dirstream);
  89 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
  90                 struct btrfs_ioctl_dev_info_args **di_ret);
  91 int get_label(const char *btrfs_dev, char *label);
  92 int set_label(const char *btrfs_dev, const char *label);
  93
  94 char *__strncpy__null(char *dest, const char *src, size_t n);
  95 int is_block_device(const char *file);
  96 int is_mount_point(const char *file);
  97 int open_path_or_dev_mnt(const char *path, DIR **dirstream);
  98 u64 btrfs_device_size(int fd, struct stat *st);
  99 /* Helper to always get proper size of the destination string */
 100 #define strncpy_null(dest, src) __strncpy__null(dest, src, sizeof(dest))
 101 int test_dev_for_mkfs(char *file, int force_overwrite, char *estr);
 102 int scan_for_btrfs(int where, int update_kernel);
 103 int get_label_mounted(const char *mount_path, char *labelp);
 104 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
 105         u64 dev_cnt, int mixed, char *estr);
 106 int is_vol_small(char *file);
 107 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
 108                            int verify);
 109 int ask_user(char *question);
 110 int lookup_ino_rootid(int fd, u64 *rootid);
 111 int btrfs_scan_lblkid(int update_kernel);
 112 int get_btrfs_mount(const char *dev, char *mp, size_t mp_size);
 113 int find_mount_root(const char *path, char **mount_root);
 114 int get_device_info(int fd, u64 devid,
 115                 struct btrfs_ioctl_dev_info_args *di_args);
 116 int test_uuid_unique(char *fs_uuid);
 117
 118 int test_minimum_size(const char *file, u32 leafsize);
 119 int test_issubvolname(const char *name);
 120 int test_isdir(const char *path);
 121
 122 /*
 123  * Btrfs minimum size calculation is complicated, it should include at least:
 124  * 1. system group size
 125  * 2. minimum global block reserve
 126  * 3. metadata used at mkfs
 127  * 4. space reservation to create uuid for first mount.
 128  * Also, raid factor should also be taken into consideration.
 129  * To avoid the overkill calculation, (system group + global block rsv) * 2
 130  * for *EACH* device should be good enough.
 131  */
 132 static inline u64 btrfs_min_global_blk_rsv_size(u32 leafsize)
 133 {
 134         return leafsize << 10;
 135 }
 136 static inline u64 btrfs_min_dev_size(u32 leafsize)
 137 {
 138         return 2 * (BTRFS_MKFS_SYSTEM_GROUP_SIZE +
 139                     btrfs_min_global_blk_rsv_size(leafsize));
 140 }
 141
 142 #endif