mkfs.c

   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 #define _XOPEN_SOURCE 500
  20 #define _GNU_SOURCE
  21
  22 #ifndef __CHECKER__
  23 #include <sys/ioctl.h>
  24 #include <sys/mount.h>
  25 #include "ioctl.h"
  26 #endif
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <fcntl.h>
  33 #include <unistd.h>
  34 #include <getopt.h>
  35 #include <uuid/uuid.h>
  36 #include <linux/fs.h>
  37 #include <ctype.h>
  38 #include "kerncompat.h"
  39 #include "ctree.h"
  40 #include "disk-io.h"
  41 #include "volumes.h"
  42 #include "transaction.h"
  43 #include "utils.h"
  44
  45 static u64 parse_size(char *s)
  46 {
  47         int len = strlen(s);
  48         char c;
  49         u64 mult = 1;
  50
  51         if (!isdigit(s[len - 1])) {
  52                 c = tolower(s[len - 1]);
  53                 switch (c) {
  54                 case 'g':
  55                         mult *= 1024;
  56                 case 'm':
  57                         mult *= 1024;
  58                 case 'k':
  59                         mult *= 1024;
  60                 case 'b':
  61                         break;
  62                 default:
  63                         fprintf(stderr, "Unknown size descriptor %c\n", c);
  64                         exit(1);
  65                 }
  66                 s[len - 1] = '\0';
  67         }
  68         return atol(s) * mult;
  69 }
  70
  71 static int make_root_dir(int fd, const char *device_name) {
  72         struct btrfs_root *root;
  73         struct btrfs_trans_handle *trans;
  74         struct btrfs_key location;
  75         u64 bytes_used;
  76         u64 chunk_start = 0;
  77         u64 chunk_size = 0;
  78         int ret;
  79
  80         root = open_ctree_fd(fd, device_name, 0, O_RDWR);
  81
  82         if (!root) {
  83                 fprintf(stderr, "ctree init failed\n");
  84                 return -1;
  85         }
  86         trans = btrfs_start_transaction(root, 1);
  87         bytes_used = btrfs_super_bytes_used(&root->fs_info->super_copy);
  88
  89         root->fs_info->system_allocs = 1;
  90         ret = btrfs_make_block_group(trans, root, bytes_used,
  91                                      BTRFS_BLOCK_GROUP_SYSTEM,
  92                                      BTRFS_FIRST_CHUNK_TREE_OBJECTID,
  93                                      0, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
  94         BUG_ON(ret);
  95
  96         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
  97                                 &chunk_start, &chunk_size,
  98                                 BTRFS_BLOCK_GROUP_METADATA);
  99         BUG_ON(ret);
 100         ret = btrfs_make_block_group(trans, root, 0,
 101                                      BTRFS_BLOCK_GROUP_METADATA,
 102                                      BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 103                                      chunk_start, chunk_size);
 104         BUG_ON(ret);
 105
 106         root->fs_info->system_allocs = 0;
 107         btrfs_commit_transaction(trans, root);
 108         trans = btrfs_start_transaction(root, 1);
 109         BUG_ON(!trans);
 110
 111         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 112                                 &chunk_start, &chunk_size,
 113                                 BTRFS_BLOCK_GROUP_DATA);
 114         BUG_ON(ret);
 115         ret = btrfs_make_block_group(trans, root, 0,
 116                                      BTRFS_BLOCK_GROUP_DATA,
 117                                      BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 118                                      chunk_start, chunk_size);
 119         BUG_ON(ret);
 120
 121         // ret = btrfs_make_block_group(trans, root, 0, 1);
 122         ret = btrfs_make_root_dir(trans, root->fs_info->tree_root,
 123                               BTRFS_ROOT_TREE_DIR_OBJECTID);
 124         if (ret)
 125                 goto err;
 126         ret = btrfs_make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID);
 127         if (ret)
 128                 goto err;
 129         memcpy(&location, &root->fs_info->fs_root->root_key, sizeof(location));
 130         location.offset = (u64)-1;
 131         ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
 132                         "default", 7,
 133                         btrfs_super_root_dir(&root->fs_info->super_copy),
 134                         &location, BTRFS_FT_DIR);
 135         if (ret)
 136                 goto err;
 137
 138         ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
 139                              "default", 7, location.objectid,
 140                              BTRFS_ROOT_TREE_DIR_OBJECTID);
 141         if (ret)
 142                 goto err;
 143
 144         btrfs_commit_transaction(trans, root);
 145         ret = close_ctree(root);
 146 err:
 147         return ret;
 148 }
 149
 150 static int recow_roots(struct btrfs_trans_handle *trans,
 151                        struct btrfs_root *root)
 152 {
 153         int ret;
 154         struct extent_buffer *tmp;
 155         struct btrfs_fs_info *info = root->fs_info;
 156
 157         ret = __btrfs_cow_block(trans, info->fs_root, info->fs_root->node,
 158                                 NULL, 0, &tmp, 0, 0);
 159         BUG_ON(ret);
 160         free_extent_buffer(tmp);
 161
 162         ret = __btrfs_cow_block(trans, info->tree_root, info->tree_root->node,
 163                                 NULL, 0, &tmp, 0, 0);
 164         BUG_ON(ret);
 165         free_extent_buffer(tmp);
 166
 167         ret = __btrfs_cow_block(trans, info->extent_root,
 168                                 info->extent_root->node, NULL, 0, &tmp, 0, 0);
 169         BUG_ON(ret);
 170         free_extent_buffer(tmp);
 171
 172         ret = __btrfs_cow_block(trans, info->chunk_root, info->chunk_root->node,
 173                                 NULL, 0, &tmp, 0, 0);
 174         BUG_ON(ret);
 175         free_extent_buffer(tmp);
 176
 177
 178         ret = __btrfs_cow_block(trans, info->dev_root, info->dev_root->node,
 179                                 NULL, 0, &tmp, 0, 0);
 180         BUG_ON(ret);
 181         free_extent_buffer(tmp);
 182
 183         return 0;
 184 }
 185
 186 static int create_one_raid_group(struct btrfs_trans_handle *trans,
 187                               struct btrfs_root *root, u64 type)
 188 {
 189         u64 chunk_start;
 190         u64 chunk_size;
 191         int ret;
 192
 193         ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root,
 194                                 &chunk_start, &chunk_size, type);
 195         BUG_ON(ret);
 196         ret = btrfs_make_block_group(trans, root->fs_info->extent_root, 0,
 197                                      type, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
 198                                      chunk_start, chunk_size);
 199         BUG_ON(ret);
 200         return ret;
 201 }
 202
 203 static int create_raid_groups(struct btrfs_trans_handle *trans,
 204                               struct btrfs_root *root, u64 data_profile,
 205                               u64 metadata_profile)
 206 {
 207         u64 num_devices = btrfs_super_num_devices(&root->fs_info->super_copy);
 208         u64 allowed;
 209         int ret;
 210
 211         if (num_devices == 1)
 212                 allowed = BTRFS_BLOCK_GROUP_DUP;
 213         else if (num_devices >= 4) {
 214                 allowed = BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
 215                         BTRFS_BLOCK_GROUP_RAID10;
 216         } else
 217                 allowed = BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1;
 218
 219         if (allowed & metadata_profile) {
 220                 ret = create_one_raid_group(trans, root,
 221                                             BTRFS_BLOCK_GROUP_SYSTEM |
 222                                             (allowed & metadata_profile));
 223                 BUG_ON(ret);
 224
 225                 ret = create_one_raid_group(trans, root,
 226                                             BTRFS_BLOCK_GROUP_METADATA |
 227                                             (allowed & metadata_profile));
 228                 BUG_ON(ret);
 229
 230                 ret = recow_roots(trans, root);
 231                 BUG_ON(ret);
 232         }
 233         if (num_devices > 1 && (allowed & data_profile)) {
 234                 ret = create_one_raid_group(trans, root,
 235                                             BTRFS_BLOCK_GROUP_DATA |
 236                                             (allowed & data_profile));
 237                 BUG_ON(ret);
 238         }
 239         return 0;
 240 }
 241
 242 static void print_usage(void)
 243 {
 244         fprintf(stderr, "usage: mkfs.btrfs [options] dev [ dev ... ]\n");
 245         fprintf(stderr, "options:\n");
 246         fprintf(stderr, "\t -b --byte-count total number of bytes in the FS\n");
 247         fprintf(stderr, "\t -l --leafsize size of btree leaves\n");
 248         fprintf(stderr, "\t -n --nodesize size of btree leaves\n");
 249         fprintf(stderr, "\t -s --sectorsize min block allocation\n");
 250         exit(1);
 251 }
 252
 253 static u64 parse_profile(char *s)
 254 {
 255         if (strcmp(s, "raid0") == 0) {
 256                 return BTRFS_BLOCK_GROUP_RAID0;
 257         } else if (strcmp(s, "raid1") == 0) {
 258                 return BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 259         } else if (strcmp(s, "raid10") == 0) {
 260                 return BTRFS_BLOCK_GROUP_RAID10 | BTRFS_BLOCK_GROUP_DUP;
 261         } else if (strcmp(s, "single") == 0) {
 262                 return 0;
 263         } else {
 264                 fprintf(stderr, "Unknown option %s\n", s);
 265                 print_usage();
 266         }
 267         return 0;
 268 }
 269
 270 static char *parse_label(char *input)
 271 {
 272         int i;
 273         int len = strlen(input);
 274
 275         if (len > BTRFS_LABEL_SIZE) {
 276                 fprintf(stderr, "Label %s is too long (max %d)\n", input,
 277                         BTRFS_LABEL_SIZE);
 278                 exit(1);
 279         }
 280         for (i = 0; i < len; i++) {
 281                 if (input[i] == '/' || input[i] == '\\') {
 282                         fprintf(stderr, "invalid label %s\n", input);
 283                         exit(1);
 284                 }
 285         }
 286         return strdup(input);
 287 }
 288
 289 static struct option long_options[] = {
 290         { "alloc-start", 1, NULL, 'A'},
 291         { "byte-count", 1, NULL, 'b' },
 292         { "leafsize", 1, NULL, 'l' },
 293         { "label", 1, NULL, 'L'},
 294         { "metadata", 1, NULL, 'm' },
 295         { "nodesize", 1, NULL, 'n' },
 296         { "sectorsize", 1, NULL, 's' },
 297         { "data", 1, NULL, 'd' },
 298         { 0, 0, 0, 0}
 299 };
 300
 301 int main(int ac, char **av)
 302 {
 303         char *file;
 304         struct btrfs_root *root;
 305         struct btrfs_trans_handle *trans;
 306         char *label = NULL;
 307         char *first_file;
 308         u64 block_count = 0;
 309         u64 dev_block_count = 0;
 310         u64 blocks[6];
 311         u64 alloc_start = 0;
 312         u64 metadata_profile = BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 313         u64 data_profile = BTRFS_BLOCK_GROUP_RAID0;
 314         u32 leafsize = getpagesize();
 315         u32 sectorsize = 4096;
 316         u32 nodesize = leafsize;
 317         u32 stripesize = 4096;
 318         int zero_end = 1;
 319         int option_index = 0;
 320         int fd;
 321         int first_fd;
 322         int ret;
 323         int i;
 324
 325         while(1) {
 326                 int c;
 327                 c = getopt_long(ac, av, "A:b:l:n:s:m:d:L:", long_options,
 328                                 &option_index);
 329                 if (c < 0)
 330                         break;
 331                 switch(c) {
 332                         case 'A':
 333                                 alloc_start = parse_size(optarg);
 334                                 break;
 335                         case 'd':
 336                                 data_profile = parse_profile(optarg);
 337                                 break;
 338                         case 'l':
 339                                 leafsize = parse_size(optarg);
 340                                 break;
 341                         case 'L':
 342                                 label = parse_label(optarg);
 343                                 break;
 344                         case 'm':
 345                                 metadata_profile = parse_profile(optarg);
 346                                 break;
 347                         case 'n':
 348                                 nodesize = parse_size(optarg);
 349                                 break;
 350                         case 's':
 351                                 sectorsize = parse_size(optarg);
 352                                 break;
 353                         case 'b':
 354                                 block_count = parse_size(optarg);
 355                                 zero_end = 0;
 356                                 break;
 357                         default:
 358                                 print_usage();
 359                 }
 360         }
 361         sectorsize = max(sectorsize, (u32)getpagesize());
 362         if (leafsize < sectorsize || (leafsize & (sectorsize - 1))) {
 363                 fprintf(stderr, "Illegal leafsize %u\n", leafsize);
 364                 exit(1);
 365         }
 366         if (nodesize < sectorsize || (nodesize & (sectorsize - 1))) {
 367                 fprintf(stderr, "Illegal nodesize %u\n", nodesize);
 368                 exit(1);
 369         }
 370         ac = ac - optind;
 371         if (ac == 0)
 372                 print_usage();
 373
 374         file = av[optind++];
 375         ret = check_mounted(file);
 376         if (ret < 0) {
 377                 fprintf(stderr, "error checking %s mount status\n", file);
 378                 exit(1);
 379         }
 380         if (ret == 1) {
 381                 fprintf(stderr, "%s is mounted\n", file);
 382                 exit(1);
 383         }
 384         ac--;
 385         fd = open(file, O_RDWR);
 386         if (fd < 0) {
 387                 fprintf(stderr, "unable to open %s\n", file);
 388                 exit(1);
 389         }
 390         first_fd = fd;
 391         first_file = file;
 392         ret = btrfs_prepare_device(fd, file, zero_end, &dev_block_count);
 393         if (block_count == 0)
 394                 block_count = dev_block_count;
 395
 396         for (i = 0; i < 6; i++)
 397                 blocks[i] = BTRFS_SUPER_INFO_OFFSET + leafsize * i;
 398
 399         ret = make_btrfs(fd, file, label, blocks, block_count,
 400                          nodesize, leafsize,
 401                          sectorsize, stripesize);
 402         if (ret) {
 403                 fprintf(stderr, "error during mkfs %d\n", ret);
 404                 exit(1);
 405         }
 406         ret = make_root_dir(fd, file);
 407         if (ret) {
 408                 fprintf(stderr, "failed to setup the root directory\n");
 409                 exit(1);
 410         }
 411         root = open_ctree(file, 0, O_RDWR);
 412         root->fs_info->alloc_start = alloc_start;
 413         trans = btrfs_start_transaction(root, 1);
 414
 415         if (ac == 0)
 416                 goto raid_groups;
 417
 418         btrfs_register_one_device(file);
 419         if (!root) {
 420                 fprintf(stderr, "ctree init failed\n");
 421                 return -1;
 422         }
 423
 424         zero_end = 1;
 425         while(ac-- > 0) {
 426                 file = av[optind++];
 427                 ret = check_mounted(file);
 428                 if (ret < 0) {
 429                         fprintf(stderr, "error checking %s mount status\n",
 430                                 file);
 431                         exit(1);
 432                 }
 433                 if (ret == 1) {
 434                         fprintf(stderr, "%s is mounted\n", file);
 435                         exit(1);
 436                 }
 437                 fd = open(file, O_RDWR);
 438                 if (fd < 0) {
 439                         fprintf(stderr, "unable to open %s\n", file);
 440                         exit(1);
 441                 }
 442                 ret = btrfs_device_already_in_root(root, fd,
 443                                                    BTRFS_SUPER_INFO_OFFSET);
 444                 if (ret) {
 445                         fprintf(stderr, "skipping duplicate device %s in FS\n",
 446                                 file);
 447                         close(fd);
 448                         continue;
 449                 }
 450                 ret = btrfs_prepare_device(fd, file, zero_end,
 451                                            &dev_block_count);
 452
 453                 BUG_ON(ret);
 454
 455                 ret = btrfs_add_to_fsid(trans, root, fd, file, dev_block_count,
 456                                         sectorsize, sectorsize, sectorsize);
 457                 BUG_ON(ret);
 458                 btrfs_register_one_device(file);
 459         }
 460
 461 raid_groups:
 462         ret = create_raid_groups(trans, root, data_profile,
 463                                  metadata_profile);
 464
 465         printf("fs created label %s on %s\n\tnodesize %u leafsize %u "
 466             "sectorsize %u size %s\n",
 467             label, first_file, nodesize, leafsize, sectorsize,
 468             pretty_sizes(btrfs_super_total_bytes(&root->fs_info->super_copy)));
 469
 470         btrfs_commit_transaction(trans, root);
 471         ret = close_ctree(root);
 472         BUG_ON(ret);
 473
 474         free(label);
 475         return 0;
 476 }
 477