btrfs-convert.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 #include "kerncompat.h"
  20
  21 #include <sys/ioctl.h>
  22 #include <sys/mount.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <fcntl.h>
  28 #include <unistd.h>
  29 #include <uuid/uuid.h>
  30 #include <linux/limits.h>
  31 #include <getopt.h>
  32
  33 #include "ctree.h"
  34 #include "disk-io.h"
  35 #include "volumes.h"
  36 #include "transaction.h"
  37 #include "crc32c.h"
  38 #include "utils.h"
  39 #include "task-utils.h"
  40 #include <ext2fs/ext2_fs.h>
  41 #include <ext2fs/ext2fs.h>
  42 #include <ext2fs/ext2_ext_attr.h>
  43
  44 #define INO_OFFSET (BTRFS_FIRST_FREE_OBJECTID - EXT2_ROOT_INO)
  45 #define CONV_IMAGE_SUBVOL_OBJECTID BTRFS_FIRST_FREE_OBJECTID
  46
  47 struct task_ctx {
  48         uint32_t max_copy_inodes;
  49         uint32_t cur_copy_inodes;
  50         struct task_info *info;
  51 };
  52
  53 static void *print_copied_inodes(void *p)
  54 {
  55         struct task_ctx *priv = p;
  56         const char work_indicator[] = { '.', 'o', 'O', 'o' };
  57         uint32_t count = 0;
  58
  59         task_period_start(priv->info, 1000 /* 1s */);
  60         while (1) {
  61                 count++;
  62                 printf("copy inodes [%c] [%10d/%10d]\r",
  63                        work_indicator[count % 4], priv->cur_copy_inodes,
  64                        priv->max_copy_inodes);
  65                 fflush(stdout);
  66                 task_period_wait(priv->info);
  67         }
  68
  69         return NULL;
  70 }
  71
  72 static int after_copied_inodes(void *p)
  73 {
  74         printf("\n");
  75         fflush(stdout);
  76
  77         return 0;
  78 }
  79
  80 struct btrfs_convert_context;
  81 struct btrfs_convert_operations {
  82         const char *name;
  83         int (*open_fs)(struct btrfs_convert_context *cctx, const char *devname);
  84         int (*alloc_block)(struct btrfs_convert_context *cctx, u64 goal,
  85                            u64 *block_ret);
  86         int (*alloc_block_range)(struct btrfs_convert_context *cctx, u64 goal,
  87                            int num, u64 *block_ret);
  88         int (*test_block)(struct btrfs_convert_context *cctx, u64 block);
  89         void (*free_block)(struct btrfs_convert_context *cctx, u64 block);
  90         void (*free_block_range)(struct btrfs_convert_context *cctx, u64 block,
  91                            int num);
  92         int (*copy_inodes)(struct btrfs_convert_context *cctx,
  93                          struct btrfs_root *root, int datacsum,
  94                          int packing, int noxattr, struct task_ctx *p);
  95         void (*close_fs)(struct btrfs_convert_context *cctx);
  96 };
  97
  98 struct btrfs_convert_context {
  99         u32 blocksize;
 100         u32 first_data_block;
 101         u32 block_count;
 102         u32 inodes_count;
 103         u32 free_inodes_count;
 104         u64 total_bytes;
 105         char *volume_name;
 106         const struct btrfs_convert_operations *convert_ops;
 107
 108         /* The accurate used space of old filesystem */
 109         struct cache_tree used;
 110
 111         /* Batched ranges which must be covered by data chunks */
 112         struct cache_tree data_chunks;
 113
 114         /* Free space which is not covered by data_chunks */
 115         struct cache_tree free;
 116
 117         void *fs_data;
 118 };
 119
 120 static void init_convert_context(struct btrfs_convert_context *cctx)
 121 {
 122         cache_tree_init(&cctx->used);
 123         cache_tree_init(&cctx->data_chunks);
 124         cache_tree_init(&cctx->free);
 125 }
 126
 127 static void clean_convert_context(struct btrfs_convert_context *cctx)
 128 {
 129         free_extent_cache_tree(&cctx->used);
 130         free_extent_cache_tree(&cctx->data_chunks);
 131         free_extent_cache_tree(&cctx->free);
 132 }
 133
 134 static inline int convert_alloc_block(struct btrfs_convert_context *cctx,
 135                                       u64 goal, u64 *ret)
 136 {
 137         return  cctx->convert_ops->alloc_block(cctx, goal, ret);
 138 }
 139
 140 static inline int convert_alloc_block_range(struct btrfs_convert_context *cctx,
 141                                       u64 goal, int num, u64 *ret)
 142 {
 143         return  cctx->convert_ops->alloc_block_range(cctx, goal, num, ret);
 144 }
 145
 146 static inline int convert_test_block(struct btrfs_convert_context *cctx,
 147                                      u64 block)
 148 {
 149         return cctx->convert_ops->test_block(cctx, block);
 150 }
 151
 152 static inline void convert_free_block(struct btrfs_convert_context *cctx,
 153                                       u64 block)
 154 {
 155         cctx->convert_ops->free_block(cctx, block);
 156 }
 157
 158 static inline void convert_free_block_range(struct btrfs_convert_context *cctx,
 159                                       u64 block, int num)
 160 {
 161         cctx->convert_ops->free_block_range(cctx, block, num);
 162 }
 163
 164 static inline int copy_inodes(struct btrfs_convert_context *cctx,
 165                               struct btrfs_root *root, int datacsum,
 166                               int packing, int noxattr, struct task_ctx *p)
 167 {
 168         return cctx->convert_ops->copy_inodes(cctx, root, datacsum, packing,
 169                                              noxattr, p);
 170 }
 171
 172 static inline void convert_close_fs(struct btrfs_convert_context *cctx)
 173 {
 174         cctx->convert_ops->close_fs(cctx);
 175 }
 176
 177 /*
 178  * Open Ext2fs in readonly mode, read block allocation bitmap and
 179  * inode bitmap into memory.
 180  */
 181 static int ext2_open_fs(struct btrfs_convert_context *cctx, const char *name)
 182 {
 183         errcode_t ret;
 184         ext2_filsys ext2_fs;
 185         ext2_ino_t ino;
 186         ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs);
 187         if (ret) {
 188                 fprintf(stderr, "ext2fs_open: %s\n", error_message(ret));
 189                 goto fail;
 190         }
 191         ret = ext2fs_read_inode_bitmap(ext2_fs);
 192         if (ret) {
 193                 fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n",
 194                         error_message(ret));
 195                 goto fail;
 196         }
 197         ret = ext2fs_read_block_bitmap(ext2_fs);
 198         if (ret) {
 199                 fprintf(stderr, "ext2fs_read_block_bitmap: %s\n",
 200                         error_message(ret));
 201                 goto fail;
 202         }
 203         /*
 204          * search each block group for a free inode. this set up
 205          * uninit block/inode bitmaps appropriately.
 206          */
 207         ino = 1;
 208         while (ino <= ext2_fs->super->s_inodes_count) {
 209                 ext2_ino_t foo;
 210                 ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo);
 211                 ino += EXT2_INODES_PER_GROUP(ext2_fs->super);
 212         }
 213
 214         if (!(ext2_fs->super->s_feature_incompat &
 215               EXT2_FEATURE_INCOMPAT_FILETYPE)) {
 216                 fprintf(stderr, "filetype feature is missing\n");
 217                 goto fail;
 218         }
 219
 220         cctx->fs_data = ext2_fs;
 221         cctx->blocksize = ext2_fs->blocksize;
 222         cctx->block_count = ext2_fs->super->s_blocks_count;
 223         cctx->total_bytes = ext2_fs->blocksize * ext2_fs->super->s_blocks_count;
 224         cctx->volume_name = strndup(ext2_fs->super->s_volume_name, 16);
 225         cctx->first_data_block = ext2_fs->super->s_first_data_block;
 226         cctx->inodes_count = ext2_fs->super->s_inodes_count;
 227         cctx->free_inodes_count = ext2_fs->super->s_free_inodes_count;
 228         return 0;
 229 fail:
 230         return -1;
 231 }
 232
 233 static void ext2_close_fs(struct btrfs_convert_context *cctx)
 234 {
 235         if (cctx->volume_name) {
 236                 free(cctx->volume_name);
 237                 cctx->volume_name = NULL;
 238         }
 239         ext2fs_close(cctx->fs_data);
 240 }
 241
 242 static int ext2_alloc_block(struct btrfs_convert_context *cctx,
 243                             u64 goal, u64 *block_ret)
 244 {
 245         ext2_filsys fs = cctx->fs_data;
 246         blk_t block;
 247
 248         if (!ext2fs_new_block(fs, goal, NULL, &block)) {
 249                 ext2fs_fast_mark_block_bitmap(fs->block_map, block);
 250                 *block_ret = block;
 251                 return 0;
 252         }
 253         return -ENOSPC;
 254 }
 255
 256 static int ext2_alloc_block_range(struct btrfs_convert_context *cctx, u64 goal,
 257                 int num, u64 *block_ret)
 258 {
 259         ext2_filsys fs = cctx->fs_data;
 260         blk_t block;
 261         ext2fs_block_bitmap bitmap = fs->block_map;
 262         blk_t start = ext2fs_get_block_bitmap_start(bitmap);
 263         blk_t end = ext2fs_get_block_bitmap_end(bitmap);
 264
 265         for (block = max_t(u64, goal, start); block + num < end; block++) {
 266                 if (ext2fs_fast_test_block_bitmap_range(bitmap, block, num)) {
 267                         ext2fs_fast_mark_block_bitmap_range(bitmap, block,
 268                                         num);
 269                         *block_ret = block;
 270                         return 0;
 271                 }
 272         }
 273         return -ENOSPC;
 274 }
 275
 276 static void ext2_free_block(struct btrfs_convert_context *cctx, u64 block)
 277 {
 278         ext2_filsys fs = cctx->fs_data;
 279
 280         BUG_ON(block != (blk_t)block);
 281         ext2fs_fast_unmark_block_bitmap(fs->block_map, block);
 282 }
 283
 284 static void ext2_free_block_range(struct btrfs_convert_context *cctx, u64 block, int num)
 285 {
 286         ext2_filsys fs = cctx->fs_data;
 287
 288         BUG_ON(block != (blk_t)block);
 289         ext2fs_fast_unmark_block_bitmap_range(fs->block_map, block, num);
 290 }
 291
 292 static int cache_free_extents(struct btrfs_root *root,
 293                               struct btrfs_convert_context *cctx)
 294
 295 {
 296         int i, ret = 0;
 297         blk_t block;
 298         u64 bytenr;
 299         u64 blocksize = cctx->blocksize;
 300
 301         block = cctx->first_data_block;
 302         for (; block < cctx->block_count; block++) {
 303                 if (convert_test_block(cctx, block))
 304                         continue;
 305                 bytenr = block * blocksize;
 306                 ret = set_extent_dirty(&root->fs_info->free_space_cache,
 307                                        bytenr, bytenr + blocksize - 1, 0);
 308                 BUG_ON(ret);
 309         }
 310
 311         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
 312                 bytenr = btrfs_sb_offset(i);
 313                 bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
 314                 if (bytenr >= blocksize * cctx->block_count)
 315                         break;
 316                 clear_extent_dirty(&root->fs_info->free_space_cache, bytenr,
 317                                    bytenr + BTRFS_STRIPE_LEN - 1, 0);
 318         }
 319
 320         clear_extent_dirty(&root->fs_info->free_space_cache,
 321                            0, BTRFS_SUPER_INFO_OFFSET - 1, 0);
 322
 323         return 0;
 324 }
 325
 326 static int custom_alloc_extent(struct btrfs_root *root, u64 num_bytes,
 327                                u64 hint_byte, struct btrfs_key *ins,
 328                                int metadata)
 329 {
 330         u64 start;
 331         u64 end;
 332         u64 last = hint_byte;
 333         int ret;
 334         int wrapped = 0;
 335         struct btrfs_block_group_cache *cache;
 336
 337         while(1) {
 338                 ret = find_first_extent_bit(&root->fs_info->free_space_cache,
 339                                             last, &start, &end, EXTENT_DIRTY);
 340                 if (ret) {
 341                         if (wrapped++ == 0) {
 342                                 last = 0;
 343                                 continue;
 344                         } else {
 345                                 goto fail;
 346                         }
 347                 }
 348
 349                 start = max(last, start);
 350                 last = end + 1;
 351                 if (last - start < num_bytes)
 352                         continue;
 353
 354                 last = start + num_bytes;
 355                 if (test_range_bit(&root->fs_info->pinned_extents,
 356                                    start, last - 1, EXTENT_DIRTY, 0))
 357                         continue;
 358
 359                 cache = btrfs_lookup_block_group(root->fs_info, start);
 360                 BUG_ON(!cache);
 361                 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM ||
 362                     last > cache->key.objectid + cache->key.offset) {
 363                         last = cache->key.objectid + cache->key.offset;
 364                         continue;
 365                 }
 366
 367                 if (metadata) {
 368                         BUG_ON(num_bytes != root->nodesize);
 369                         if (check_crossing_stripes(start, num_bytes)) {
 370                                 last = round_down(start + num_bytes,
 371                                                   BTRFS_STRIPE_LEN);
 372                                 continue;
 373                         }
 374                 }
 375                 clear_extent_dirty(&root->fs_info->free_space_cache,
 376                                    start, start + num_bytes - 1, 0);
 377
 378                 ins->objectid = start;
 379                 ins->offset = num_bytes;
 380                 ins->type = BTRFS_EXTENT_ITEM_KEY;
 381                 return 0;
 382         }
 383 fail:
 384         fprintf(stderr, "not enough free space\n");
 385         return -ENOSPC;
 386 }
 387
 388 static int intersect_with_sb(u64 bytenr, u64 num_bytes)
 389 {
 390         int i;
 391         u64 offset;
 392
 393         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
 394                 offset = btrfs_sb_offset(i);
 395                 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
 396
 397                 if (bytenr < offset + BTRFS_STRIPE_LEN &&
 398                     bytenr + num_bytes > offset)
 399                         return 1;
 400         }
 401         return 0;
 402 }
 403
 404 static int custom_free_extent(struct btrfs_root *root, u64 bytenr,
 405                               u64 num_bytes)
 406 {
 407         return intersect_with_sb(bytenr, num_bytes);
 408 }
 409
 410 static struct btrfs_extent_ops extent_ops = {
 411         .alloc_extent = custom_alloc_extent,
 412         .free_extent = custom_free_extent,
 413 };
 414
 415 static int convert_insert_dirent(struct btrfs_trans_handle *trans,
 416                                  struct btrfs_root *root,
 417                                  const char *name, size_t name_len,
 418                                  u64 dir, u64 objectid,
 419                                  u8 file_type, u64 index_cnt,
 420                                  struct btrfs_inode_item *inode)
 421 {
 422         int ret;
 423         u64 inode_size;
 424         struct btrfs_key location = {
 425                 .objectid = objectid,
 426                 .offset = 0,
 427                 .type = BTRFS_INODE_ITEM_KEY,
 428         };
 429
 430         ret = btrfs_insert_dir_item(trans, root, name, name_len,
 431                                     dir, &location, file_type, index_cnt);
 432         if (ret)
 433                 return ret;
 434         ret = btrfs_insert_inode_ref(trans, root, name, name_len,
 435                                      objectid, dir, index_cnt);
 436         if (ret)
 437                 return ret;
 438         inode_size = btrfs_stack_inode_size(inode) + name_len * 2;
 439         btrfs_set_stack_inode_size(inode, inode_size);
 440
 441         return 0;
 442 }
 443
 444 struct dir_iterate_data {
 445         struct btrfs_trans_handle *trans;
 446         struct btrfs_root *root;
 447         struct btrfs_inode_item *inode;
 448         u64 objectid;
 449         u64 index_cnt;
 450         u64 parent;
 451         int errcode;
 452 };
 453
 454 static u8 filetype_conversion_table[EXT2_FT_MAX] = {
 455         [EXT2_FT_UNKNOWN]       = BTRFS_FT_UNKNOWN,
 456         [EXT2_FT_REG_FILE]      = BTRFS_FT_REG_FILE,
 457         [EXT2_FT_DIR]           = BTRFS_FT_DIR,
 458         [EXT2_FT_CHRDEV]        = BTRFS_FT_CHRDEV,
 459         [EXT2_FT_BLKDEV]        = BTRFS_FT_BLKDEV,
 460         [EXT2_FT_FIFO]          = BTRFS_FT_FIFO,
 461         [EXT2_FT_SOCK]          = BTRFS_FT_SOCK,
 462         [EXT2_FT_SYMLINK]       = BTRFS_FT_SYMLINK,
 463 };
 464
 465 static int dir_iterate_proc(ext2_ino_t dir, int entry,
 466                             struct ext2_dir_entry *dirent,
 467                             int offset, int blocksize,
 468                             char *buf,void *priv_data)
 469 {
 470         int ret;
 471         int file_type;
 472         u64 objectid;
 473         char dotdot[] = "..";
 474         struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data;
 475         int name_len;
 476
 477         name_len = dirent->name_len & 0xFF;
 478
 479         objectid = dirent->inode + INO_OFFSET;
 480         if (!strncmp(dirent->name, dotdot, name_len)) {
 481                 if (name_len == 2) {
 482                         BUG_ON(idata->parent != 0);
 483                         idata->parent = objectid;
 484                 }
 485                 return 0;
 486         }
 487         if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO)
 488                 return 0;
 489
 490         file_type = dirent->name_len >> 8;
 491         BUG_ON(file_type > EXT2_FT_SYMLINK);
 492
 493         ret = convert_insert_dirent(idata->trans, idata->root, dirent->name,
 494                                     name_len, idata->objectid, objectid,
 495                                     filetype_conversion_table[file_type],
 496                                     idata->index_cnt, idata->inode);
 497         if (ret < 0) {
 498                 idata->errcode = ret;
 499                 return BLOCK_ABORT;
 500         }
 501
 502         idata->index_cnt++;
 503         return 0;
 504 }
 505
 506 static int create_dir_entries(struct btrfs_trans_handle *trans,
 507                               struct btrfs_root *root, u64 objectid,
 508                               struct btrfs_inode_item *btrfs_inode,
 509                               ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
 510 {
 511         int ret;
 512         errcode_t err;
 513         struct dir_iterate_data data = {
 514                 .trans          = trans,
 515                 .root           = root,
 516                 .inode          = btrfs_inode,
 517                 .objectid       = objectid,
 518                 .index_cnt      = 2,
 519                 .parent         = 0,
 520                 .errcode        = 0,
 521         };
 522
 523         err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL,
 524                                   dir_iterate_proc, &data);
 525         if (err)
 526                 goto error;
 527         ret = data.errcode;
 528         if (ret == 0 && data.parent == objectid) {
 529                 ret = btrfs_insert_inode_ref(trans, root, "..", 2,
 530                                              objectid, objectid, 0);
 531         }
 532         return ret;
 533 error:
 534         fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err));
 535         return -1;
 536 }
 537
 538 static int read_disk_extent(struct btrfs_root *root, u64 bytenr,
 539                             u32 num_bytes, char *buffer)
 540 {
 541         int ret;
 542         struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
 543
 544         ret = pread(fs_devs->latest_bdev, buffer, num_bytes, bytenr);
 545         if (ret != num_bytes)
 546                 goto fail;
 547         ret = 0;
 548 fail:
 549         if (ret > 0)
 550                 ret = -1;
 551         return ret;
 552 }
 553
 554 static int csum_disk_extent(struct btrfs_trans_handle *trans,
 555                             struct btrfs_root *root,
 556                             u64 disk_bytenr, u64 num_bytes)
 557 {
 558         u32 blocksize = root->sectorsize;
 559         u64 offset;
 560         char *buffer;
 561         int ret = 0;
 562
 563         buffer = malloc(blocksize);
 564         if (!buffer)
 565                 return -ENOMEM;
 566         for (offset = 0; offset < num_bytes; offset += blocksize) {
 567                 ret = read_disk_extent(root, disk_bytenr + offset,
 568                                         blocksize, buffer);
 569                 if (ret)
 570                         break;
 571                 ret = btrfs_csum_file_block(trans,
 572                                             root->fs_info->csum_root,
 573                                             disk_bytenr + num_bytes,
 574                                             disk_bytenr + offset,
 575                                             buffer, blocksize);
 576                 if (ret)
 577                         break;
 578         }
 579         free(buffer);
 580         return ret;
 581 }
 582
 583 struct blk_iterate_data {
 584         struct btrfs_trans_handle *trans;
 585         struct btrfs_root *root;
 586         struct btrfs_inode_item *inode;
 587         u64 objectid;
 588         u64 first_block;
 589         u64 disk_block;
 590         u64 num_blocks;
 591         u64 boundary;
 592         int checksum;
 593         int errcode;
 594 };
 595
 596 static void init_blk_iterate_data(struct blk_iterate_data *data,
 597                                   struct btrfs_trans_handle *trans,
 598                                   struct btrfs_root *root,
 599                                   struct btrfs_inode_item *inode,
 600                                   u64 objectid, int checksum)
 601 {
 602         data->trans             = trans;
 603         data->root              = root;
 604         data->inode             = inode;
 605         data->objectid          = objectid;
 606         data->first_block       = 0;
 607         data->disk_block        = 0;
 608         data->num_blocks        = 0;
 609         data->boundary          = (u64)-1;
 610         data->checksum          = checksum;
 611         data->errcode           = 0;
 612 }
 613
 614 static int record_file_blocks(struct blk_iterate_data *data,
 615                               u64 file_block, u64 disk_block, u64 num_blocks)
 616 {
 617         int ret;
 618         struct btrfs_root *root = data->root;
 619         u64 file_pos = file_block * root->sectorsize;
 620         u64 disk_bytenr = disk_block * root->sectorsize;
 621         u64 num_bytes = num_blocks * root->sectorsize;
 622         ret = btrfs_record_file_extent(data->trans, data->root,
 623                                        data->objectid, data->inode, file_pos,
 624                                        disk_bytenr, num_bytes);
 625
 626         if (ret || !data->checksum || disk_bytenr == 0)
 627                 return ret;
 628
 629         return csum_disk_extent(data->trans, data->root, disk_bytenr,
 630                                 num_bytes);
 631 }
 632
 633 static int block_iterate_proc(u64 disk_block, u64 file_block,
 634                               struct blk_iterate_data *idata)
 635 {
 636         int ret = 0;
 637         int sb_region;
 638         int do_barrier;
 639         struct btrfs_root *root = idata->root;
 640         struct btrfs_block_group_cache *cache;
 641         u64 bytenr = disk_block * root->sectorsize;
 642
 643         sb_region = intersect_with_sb(bytenr, root->sectorsize);
 644         do_barrier = sb_region || disk_block >= idata->boundary;
 645         if ((idata->num_blocks > 0 && do_barrier) ||
 646             (file_block > idata->first_block + idata->num_blocks) ||
 647             (disk_block != idata->disk_block + idata->num_blocks)) {
 648                 if (idata->num_blocks > 0) {
 649                         ret = record_file_blocks(idata, idata->first_block,
 650                                                  idata->disk_block,
 651                                                  idata->num_blocks);
 652                         if (ret)
 653                                 goto fail;
 654                         idata->first_block += idata->num_blocks;
 655                         idata->num_blocks = 0;
 656                 }
 657                 if (file_block > idata->first_block) {
 658                         ret = record_file_blocks(idata, idata->first_block,
 659                                         0, file_block - idata->first_block);
 660                         if (ret)
 661                                 goto fail;
 662                 }
 663
 664                 if (sb_region) {
 665                         bytenr += BTRFS_STRIPE_LEN - 1;
 666                         bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1);
 667                 } else {
 668                         cache = btrfs_lookup_block_group(root->fs_info, bytenr);
 669                         BUG_ON(!cache);
 670                         bytenr = cache->key.objectid + cache->key.offset;
 671                 }
 672
 673                 idata->first_block = file_block;
 674                 idata->disk_block = disk_block;
 675                 idata->boundary = bytenr / root->sectorsize;
 676         }
 677         idata->num_blocks++;
 678 fail:
 679         return ret;
 680 }
 681
 682 static int __block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
 683                                 e2_blkcnt_t blockcnt, blk_t ref_block,
 684                                 int ref_offset, void *priv_data)
 685 {
 686         int ret;
 687         struct blk_iterate_data *idata;
 688         idata = (struct blk_iterate_data *)priv_data;
 689         ret = block_iterate_proc(*blocknr, blockcnt, idata);
 690         if (ret) {
 691                 idata->errcode = ret;
 692                 return BLOCK_ABORT;
 693         }
 694         return 0;
 695 }
 696
 697 /*
 698  * traverse file's data blocks, record these data blocks as file extents.
 699  */
 700 static int create_file_extents(struct btrfs_trans_handle *trans,
 701                                struct btrfs_root *root, u64 objectid,
 702                                struct btrfs_inode_item *btrfs_inode,
 703                                ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
 704                                int datacsum, int packing)
 705 {
 706         int ret;
 707         char *buffer = NULL;
 708         errcode_t err;
 709         u32 last_block;
 710         u32 sectorsize = root->sectorsize;
 711         u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
 712         struct blk_iterate_data data;
 713
 714         init_blk_iterate_data(&data, trans, root, btrfs_inode, objectid,
 715                               datacsum);
 716
 717         err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
 718                                     NULL, __block_iterate_proc, &data);
 719         if (err)
 720                 goto error;
 721         ret = data.errcode;
 722         if (ret)
 723                 goto fail;
 724         if (packing && data.first_block == 0 && data.num_blocks > 0 &&
 725             inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
 726                 u64 num_bytes = data.num_blocks * sectorsize;
 727                 u64 disk_bytenr = data.disk_block * sectorsize;
 728                 u64 nbytes;
 729
 730                 buffer = malloc(num_bytes);
 731                 if (!buffer)
 732                         return -ENOMEM;
 733                 ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer);
 734                 if (ret)
 735                         goto fail;
 736                 if (num_bytes > inode_size)
 737                         num_bytes = inode_size;
 738                 ret = btrfs_insert_inline_extent(trans, root, objectid,
 739                                                  0, buffer, num_bytes);
 740                 if (ret)
 741                         goto fail;
 742                 nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes;
 743                 btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes);
 744         } else if (data.num_blocks > 0) {
 745                 ret = record_file_blocks(&data, data.first_block,
 746                                          data.disk_block, data.num_blocks);
 747                 if (ret)
 748                         goto fail;
 749         }
 750         data.first_block += data.num_blocks;
 751         last_block = (inode_size + sectorsize - 1) / sectorsize;
 752         if (last_block > data.first_block) {
 753                 ret = record_file_blocks(&data, data.first_block, 0,
 754                                          last_block - data.first_block);
 755         }
 756 fail:
 757         free(buffer);
 758         return ret;
 759 error:
 760         fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
 761         return -1;
 762 }
 763
 764 static int create_symbol_link(struct btrfs_trans_handle *trans,
 765                               struct btrfs_root *root, u64 objectid,
 766                               struct btrfs_inode_item *btrfs_inode,
 767                               ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
 768                               struct ext2_inode *ext2_inode)
 769 {
 770         int ret;
 771         char *pathname;
 772         u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
 773         if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) {
 774                 btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1);
 775                 ret = create_file_extents(trans, root, objectid, btrfs_inode,
 776                                           ext2_fs, ext2_ino, 1, 1);
 777                 btrfs_set_stack_inode_size(btrfs_inode, inode_size);
 778                 return ret;
 779         }
 780
 781         pathname = (char *)&(ext2_inode->i_block[0]);
 782         BUG_ON(pathname[inode_size] != 0);
 783         ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
 784                                          pathname, inode_size + 1);
 785         btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1);
 786         return ret;
 787 }
 788
 789 /*
 790  * Following xattr/acl related codes are based on codes in
 791  * fs/ext3/xattr.c and fs/ext3/acl.c
 792  */
 793 #define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr))
 794 #define EXT2_XATTR_BFIRST(ptr) \
 795         ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1))
 796 #define EXT2_XATTR_IHDR(inode) \
 797         ((struct ext2_ext_attr_header *) ((void *)(inode) + \
 798                 EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize))
 799 #define EXT2_XATTR_IFIRST(inode) \
 800         ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \
 801                 sizeof(EXT2_XATTR_IHDR(inode)->h_magic)))
 802
 803 static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry,
 804                                   const void *end)
 805 {
 806         struct ext2_ext_attr_entry *next;
 807
 808         while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
 809                 next = EXT2_EXT_ATTR_NEXT(entry);
 810                 if ((void *)next >= end)
 811                         return -EIO;
 812                 entry = next;
 813         }
 814         return 0;
 815 }
 816
 817 static int ext2_xattr_check_block(const char *buf, size_t size)
 818 {
 819         int error;
 820         struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf);
 821
 822         if (header->h_magic != EXT2_EXT_ATTR_MAGIC ||
 823             header->h_blocks != 1)
 824                 return -EIO;
 825         error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size);
 826         return error;
 827 }
 828
 829 static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry,
 830                                   size_t size)
 831 {
 832         size_t value_size = entry->e_value_size;
 833
 834         if (entry->e_value_block != 0 || value_size > size ||
 835             entry->e_value_offs + value_size > size)
 836                 return -EIO;
 837         return 0;
 838 }
 839
 840 #define EXT2_ACL_VERSION        0x0001
 841
 842 /* 23.2.5 acl_tag_t values */
 843
 844 #define ACL_UNDEFINED_TAG       (0x00)
 845 #define ACL_USER_OBJ            (0x01)
 846 #define ACL_USER                (0x02)
 847 #define ACL_GROUP_OBJ           (0x04)
 848 #define ACL_GROUP               (0x08)
 849 #define ACL_MASK                (0x10)
 850 #define ACL_OTHER               (0x20)
 851
 852 /* 23.2.7 ACL qualifier constants */
 853
 854 #define ACL_UNDEFINED_ID        ((id_t)-1)
 855
 856 typedef struct {
 857         __le16          e_tag;
 858         __le16          e_perm;
 859         __le32          e_id;
 860 } ext2_acl_entry;
 861
 862 typedef struct {
 863         __le16          e_tag;
 864         __le16          e_perm;
 865 } ext2_acl_entry_short;
 866
 867 typedef struct {
 868         __le32          a_version;
 869 } ext2_acl_header;
 870
 871 static inline int ext2_acl_count(size_t size)
 872 {
 873         ssize_t s;
 874         size -= sizeof(ext2_acl_header);
 875         s = size - 4 * sizeof(ext2_acl_entry_short);
 876         if (s < 0) {
 877                 if (size % sizeof(ext2_acl_entry_short))
 878                         return -1;
 879                 return size / sizeof(ext2_acl_entry_short);
 880         } else {
 881                 if (s % sizeof(ext2_acl_entry))
 882                         return -1;
 883                 return s / sizeof(ext2_acl_entry) + 4;
 884         }
 885 }
 886
 887 #define ACL_EA_VERSION          0x0002
 888
 889 typedef struct {
 890         __le16          e_tag;
 891         __le16          e_perm;
 892         __le32          e_id;
 893 } acl_ea_entry;
 894
 895 typedef struct {
 896         __le32          a_version;
 897         acl_ea_entry    a_entries[0];
 898 } acl_ea_header;
 899
 900 static inline size_t acl_ea_size(int count)
 901 {
 902         return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry);
 903 }
 904
 905 static int ext2_acl_to_xattr(void *dst, const void *src,
 906                              size_t dst_size, size_t src_size)
 907 {
 908         int i, count;
 909         const void *end = src + src_size;
 910         acl_ea_header *ext_acl = (acl_ea_header *)dst;
 911         acl_ea_entry *dst_entry = ext_acl->a_entries;
 912         ext2_acl_entry *src_entry;
 913
 914         if (src_size < sizeof(ext2_acl_header))
 915                 goto fail;
 916         if (((ext2_acl_header *)src)->a_version !=
 917             cpu_to_le32(EXT2_ACL_VERSION))
 918                 goto fail;
 919         src += sizeof(ext2_acl_header);
 920         count = ext2_acl_count(src_size);
 921         if (count <= 0)
 922                 goto fail;
 923
 924         BUG_ON(dst_size < acl_ea_size(count));
 925         ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION);
 926         for (i = 0; i < count; i++, dst_entry++) {
 927                 src_entry = (ext2_acl_entry *)src;
 928                 if (src + sizeof(ext2_acl_entry_short) > end)
 929                         goto fail;
 930                 dst_entry->e_tag = src_entry->e_tag;
 931                 dst_entry->e_perm = src_entry->e_perm;
 932                 switch (le16_to_cpu(src_entry->e_tag)) {
 933                 case ACL_USER_OBJ:
 934                 case ACL_GROUP_OBJ:
 935                 case ACL_MASK:
 936                 case ACL_OTHER:
 937                         src += sizeof(ext2_acl_entry_short);
 938                         dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
 939                         break;
 940                 case ACL_USER:
 941                 case ACL_GROUP:
 942                         src += sizeof(ext2_acl_entry);
 943                         if (src > end)
 944                                 goto fail;
 945                         dst_entry->e_id = src_entry->e_id;
 946                         break;
 947                 default:
 948                         goto fail;
 949                 }
 950         }
 951         if (src != end)
 952                 goto fail;
 953         return 0;
 954 fail:
 955         return -EINVAL;
 956 }
 957
 958 static char *xattr_prefix_table[] = {
 959         [1] =   "user.",
 960         [2] =   "system.posix_acl_access",
 961         [3] =   "system.posix_acl_default",
 962         [4] =   "trusted.",
 963         [6] =   "security.",
 964 };
 965
 966 static int copy_single_xattr(struct btrfs_trans_handle *trans,
 967                              struct btrfs_root *root, u64 objectid,
 968                              struct ext2_ext_attr_entry *entry,
 969                              const void *data, u32 datalen)
 970 {
 971         int ret = 0;
 972         int name_len;
 973         int name_index;
 974         void *databuf = NULL;
 975         char namebuf[XATTR_NAME_MAX + 1];
 976
 977         name_index = entry->e_name_index;
 978         if (name_index >= ARRAY_SIZE(xattr_prefix_table) ||
 979             xattr_prefix_table[name_index] == NULL)
 980                 return -EOPNOTSUPP;
 981         name_len = strlen(xattr_prefix_table[name_index]) +
 982                    entry->e_name_len;
 983         if (name_len >= sizeof(namebuf))
 984                 return -ERANGE;
 985
 986         if (name_index == 2 || name_index == 3) {
 987                 size_t bufsize = acl_ea_size(ext2_acl_count(datalen));
 988                 databuf = malloc(bufsize);
 989                 if (!databuf)
 990                        return -ENOMEM;
 991                 ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen);
 992                 if (ret)
 993                         goto out;
 994                 data = databuf;
 995                 datalen = bufsize;
 996         }
 997         strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX);
 998         strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len);
 999         if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) -
1000             sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
1001                 fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n",
1002                         objectid - INO_OFFSET, name_len, namebuf);
1003                 goto out;
1004         }
1005         ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len,
1006                                       data, datalen, objectid);
1007 out:
1008         free(databuf);
1009         return ret;
1010 }
1011
1012 static int copy_extended_attrs(struct btrfs_trans_handle *trans,
1013                                struct btrfs_root *root, u64 objectid,
1014                                struct btrfs_inode_item *btrfs_inode,
1015                                ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
1016 {
1017         int ret = 0;
1018         int inline_ea = 0;
1019         errcode_t err;
1020         u32 datalen;
1021         u32 block_size = ext2_fs->blocksize;
1022         u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super);
1023         struct ext2_inode_large *ext2_inode;
1024         struct ext2_ext_attr_entry *entry;
1025         void *data;
1026         char *buffer = NULL;
1027         char inode_buf[EXT2_GOOD_OLD_INODE_SIZE];
1028
1029         if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) {
1030                 ext2_inode = (struct ext2_inode_large *)inode_buf;
1031         } else {
1032                 ext2_inode = (struct ext2_inode_large *)malloc(inode_size);
1033                 if (!ext2_inode)
1034                        return -ENOMEM;
1035         }
1036         err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode,
1037                                      inode_size);
1038         if (err) {
1039                 fprintf(stderr, "ext2fs_read_inode_full: %s\n",
1040                         error_message(err));
1041                 ret = -1;
1042                 goto out;
1043         }
1044
1045         if (ext2_ino > ext2_fs->super->s_first_ino &&
1046             inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
1047                 if (EXT2_GOOD_OLD_INODE_SIZE +
1048                     ext2_inode->i_extra_isize > inode_size) {
1049                         ret = -EIO;
1050                         goto out;
1051                 }
1052                 if (ext2_inode->i_extra_isize != 0 &&
1053                     EXT2_XATTR_IHDR(ext2_inode)->h_magic ==
1054                     EXT2_EXT_ATTR_MAGIC) {
1055                         inline_ea = 1;
1056                 }
1057         }
1058         if (inline_ea) {
1059                 int total;
1060                 void *end = (void *)ext2_inode + inode_size;
1061                 entry = EXT2_XATTR_IFIRST(ext2_inode);
1062                 total = end - (void *)entry;
1063                 ret = ext2_xattr_check_names(entry, end);
1064                 if (ret)
1065                         goto out;
1066                 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
1067                         ret = ext2_xattr_check_entry(entry, total);
1068                         if (ret)
1069                                 goto out;
1070                         data = (void *)EXT2_XATTR_IFIRST(ext2_inode) +
1071                                 entry->e_value_offs;
1072                         datalen = entry->e_value_size;
1073                         ret = copy_single_xattr(trans, root, objectid,
1074                                                 entry, data, datalen);
1075                         if (ret)
1076                                 goto out;
1077                         entry = EXT2_EXT_ATTR_NEXT(entry);
1078                 }
1079         }
1080
1081         if (ext2_inode->i_file_acl == 0)
1082                 goto out;
1083
1084         buffer = malloc(block_size);
1085         if (!buffer) {
1086                 ret = -ENOMEM;
1087                 goto out;
1088         }
1089         err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer);
1090         if (err) {
1091                 fprintf(stderr, "ext2fs_read_ext_attr: %s\n",
1092                         error_message(err));
1093                 ret = -1;
1094                 goto out;
1095         }
1096         ret = ext2_xattr_check_block(buffer, block_size);
1097         if (ret)
1098                 goto out;
1099
1100         entry = EXT2_XATTR_BFIRST(buffer);
1101         while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
1102                 ret = ext2_xattr_check_entry(entry, block_size);
1103                 if (ret)
1104                         goto out;
1105                 data = buffer + entry->e_value_offs;
1106                 datalen = entry->e_value_size;
1107                 ret = copy_single_xattr(trans, root, objectid,
1108                                         entry, data, datalen);
1109                 if (ret)
1110                         goto out;
1111                 entry = EXT2_EXT_ATTR_NEXT(entry);
1112         }
1113 out:
1114         free(buffer);
1115         if ((void *)ext2_inode != inode_buf)
1116                 free(ext2_inode);
1117         return ret;
1118 }
1119 #define MINORBITS       20
1120 #define MKDEV(ma, mi)   (((ma) << MINORBITS) | (mi))
1121
1122 static inline dev_t old_decode_dev(u16 val)
1123 {
1124         return MKDEV((val >> 8) & 255, val & 255);
1125 }
1126
1127 static inline dev_t new_decode_dev(u32 dev)
1128 {
1129         unsigned major = (dev & 0xfff00) >> 8;
1130         unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
1131         return MKDEV(major, minor);
1132 }
1133
1134 static int copy_inode_item(struct btrfs_inode_item *dst,
1135                            struct ext2_inode *src, u32 blocksize)
1136 {
1137         btrfs_set_stack_inode_generation(dst, 1);
1138         btrfs_set_stack_inode_sequence(dst, 0);
1139         btrfs_set_stack_inode_transid(dst, 1);
1140         btrfs_set_stack_inode_size(dst, src->i_size);
1141         btrfs_set_stack_inode_nbytes(dst, 0);
1142         btrfs_set_stack_inode_block_group(dst, 0);
1143         btrfs_set_stack_inode_nlink(dst, src->i_links_count);
1144         btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16));
1145         btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16));
1146         btrfs_set_stack_inode_mode(dst, src->i_mode);
1147         btrfs_set_stack_inode_rdev(dst, 0);
1148         btrfs_set_stack_inode_flags(dst, 0);
1149         btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime);
1150         btrfs_set_stack_timespec_nsec(&dst->atime, 0);
1151         btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime);
1152         btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
1153         btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime);
1154         btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
1155         btrfs_set_stack_timespec_sec(&dst->otime, 0);
1156         btrfs_set_stack_timespec_nsec(&dst->otime, 0);
1157
1158         if (S_ISDIR(src->i_mode)) {
1159                 btrfs_set_stack_inode_size(dst, 0);
1160                 btrfs_set_stack_inode_nlink(dst, 1);
1161         }
1162         if (S_ISREG(src->i_mode)) {
1163                 btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 |
1164                                            (u64)src->i_size);
1165         }
1166         if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) &&
1167             !S_ISLNK(src->i_mode)) {
1168                 if (src->i_block[0]) {
1169                         btrfs_set_stack_inode_rdev(dst,
1170                                 old_decode_dev(src->i_block[0]));
1171                 } else {
1172                         btrfs_set_stack_inode_rdev(dst,
1173                                 new_decode_dev(src->i_block[1]));
1174                 }
1175         }
1176         memset(&dst->reserved, 0, sizeof(dst->reserved));
1177
1178         return 0;
1179 }
1180
1181 /*
1182  * copy a single inode. do all the required works, such as cloning
1183  * inode item, creating file extents and creating directory entries.
1184  */
1185 static int copy_single_inode(struct btrfs_trans_handle *trans,
1186                              struct btrfs_root *root, u64 objectid,
1187                              ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
1188                              struct ext2_inode *ext2_inode,
1189                              int datacsum, int packing, int noxattr)
1190 {
1191         int ret;
1192         struct btrfs_inode_item btrfs_inode;
1193
1194         if (ext2_inode->i_links_count == 0)
1195                 return 0;
1196
1197         copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize);
1198         if (!datacsum && S_ISREG(ext2_inode->i_mode)) {
1199                 u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
1200                             BTRFS_INODE_NODATASUM;
1201                 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
1202         }
1203
1204         switch (ext2_inode->i_mode & S_IFMT) {
1205         case S_IFREG:
1206                 ret = create_file_extents(trans, root, objectid, &btrfs_inode,
1207                                         ext2_fs, ext2_ino, datacsum, packing);
1208                 break;
1209         case S_IFDIR:
1210                 ret = create_dir_entries(trans, root, objectid, &btrfs_inode,
1211                                          ext2_fs, ext2_ino);
1212                 break;
1213         case S_IFLNK:
1214                 ret = create_symbol_link(trans, root, objectid, &btrfs_inode,
1215                                          ext2_fs, ext2_ino, ext2_inode);
1216                 break;
1217         default:
1218                 ret = 0;
1219                 break;
1220         }
1221         if (ret)
1222                 return ret;
1223
1224         if (!noxattr) {
1225                 ret = copy_extended_attrs(trans, root, objectid, &btrfs_inode,
1226                                           ext2_fs, ext2_ino);
1227                 if (ret)
1228                         return ret;
1229         }
1230         return btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1231 }
1232
1233 static int copy_disk_extent(struct btrfs_root *root, u64 dst_bytenr,
1234                             u64 src_bytenr, u32 num_bytes)
1235 {
1236         int ret;
1237         char *buffer;
1238         struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
1239
1240         buffer = malloc(num_bytes);
1241         if (!buffer)
1242                 return -ENOMEM;
1243         ret = pread(fs_devs->latest_bdev, buffer, num_bytes, src_bytenr);
1244         if (ret != num_bytes)
1245                 goto fail;
1246         ret = pwrite(fs_devs->latest_bdev, buffer, num_bytes, dst_bytenr);
1247         if (ret != num_bytes)
1248                 goto fail;
1249         ret = 0;
1250 fail:
1251         free(buffer);
1252         if (ret > 0)
1253                 ret = -1;
1254         return ret;
1255 }
1256 /*
1257  * scan ext2's inode bitmap and copy all used inodes.
1258  */
1259 static int ext2_copy_inodes(struct btrfs_convert_context *cctx,
1260                             struct btrfs_root *root,
1261                             int datacsum, int packing, int noxattr, struct task_ctx *p)
1262 {
1263         ext2_filsys ext2_fs = cctx->fs_data;
1264         int ret;
1265         errcode_t err;
1266         ext2_inode_scan ext2_scan;
1267         struct ext2_inode ext2_inode;
1268         ext2_ino_t ext2_ino;
1269         u64 objectid;
1270         struct btrfs_trans_handle *trans;
1271
1272         trans = btrfs_start_transaction(root, 1);
1273         if (!trans)
1274                 return -ENOMEM;
1275         err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan);
1276         if (err) {
1277                 fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err));
1278                 return -1;
1279         }
1280         while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino,
1281                                              &ext2_inode))) {
1282                 /* no more inodes */
1283                 if (ext2_ino == 0)
1284                         break;
1285                 /* skip special inode in ext2fs */
1286                 if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO &&
1287                     ext2_ino != EXT2_ROOT_INO)
1288                         continue;
1289                 objectid = ext2_ino + INO_OFFSET;
1290                 ret = copy_single_inode(trans, root,
1291                                         objectid, ext2_fs, ext2_ino,
1292                                         &ext2_inode, datacsum, packing,
1293                                         noxattr);
1294                 p->cur_copy_inodes++;
1295                 if (ret)
1296                         return ret;
1297                 if (trans->blocks_used >= 4096) {
1298                         ret = btrfs_commit_transaction(trans, root);
1299                         BUG_ON(ret);
1300                         trans = btrfs_start_transaction(root, 1);
1301                         BUG_ON(!trans);
1302                 }
1303         }
1304         if (err) {
1305                 fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err));
1306                 return -1;
1307         }
1308         ret = btrfs_commit_transaction(trans, root);
1309         BUG_ON(ret);
1310         ext2fs_close_inode_scan(ext2_scan);
1311
1312         return ret;
1313 }
1314
1315 static int ext2_test_block(struct btrfs_convert_context *cctx, u64 block)
1316 {
1317         ext2_filsys ext2_fs = cctx->fs_data;
1318
1319         BUG_ON(block != (u32)block);
1320         return ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block);
1321 }
1322
1323 /*
1324  * Construct a range of ext2fs image file.
1325  * scan block allocation bitmap, find all blocks used by the ext2fs
1326  * in this range and create file extents that point to these blocks.
1327  *
1328  * Note: Before calling the function, no file extent points to blocks
1329  *       in this range
1330  */
1331 static int create_image_file_range(struct btrfs_trans_handle *trans,
1332                                    struct btrfs_root *root, u64 objectid,
1333                                    struct btrfs_inode_item *inode,
1334                                    u64 start_byte, u64 end_byte,
1335                                    struct btrfs_convert_context *cctx, int datacsum)
1336 {
1337         u32 blocksize = cctx->blocksize;
1338         u32 block = start_byte / blocksize;
1339         u32 last_block = (end_byte + blocksize - 1) / blocksize;
1340         int ret = 0;
1341         struct blk_iterate_data data;
1342
1343         init_blk_iterate_data(&data, trans, root, inode, objectid, datacsum);
1344         data.first_block = block;
1345
1346         for (; start_byte < end_byte; block++, start_byte += blocksize) {
1347                 if (!convert_test_block(cctx, block))
1348                         continue;
1349                 ret = block_iterate_proc(block, block, &data);
1350                 if (ret < 0)
1351                         goto fail;
1352         }
1353         if (data.num_blocks > 0) {
1354                 ret = record_file_blocks(&data, data.first_block,
1355                                          data.disk_block, data.num_blocks);
1356                 if (ret)
1357                         goto fail;
1358                 data.first_block += data.num_blocks;
1359         }
1360         if (last_block > data.first_block) {
1361                 ret = record_file_blocks(&data, data.first_block, 0,
1362                                          last_block - data.first_block);
1363                 if (ret)
1364                         goto fail;
1365         }
1366 fail:
1367         return ret;
1368 }
1369 /*
1370  * Create the fs image file.
1371  */
1372 static int create_image(struct btrfs_convert_context *cctx,
1373                         struct btrfs_root *root, const char *name, int datacsum)
1374 {
1375         int ret;
1376         struct btrfs_key key;
1377         struct btrfs_key location;
1378         struct btrfs_path path;
1379         struct btrfs_inode_item btrfs_inode;
1380         struct btrfs_inode_item *inode_item;
1381         struct extent_buffer *leaf;
1382         struct btrfs_fs_info *fs_info = root->fs_info;
1383         struct btrfs_root *extent_root = fs_info->extent_root;
1384         struct btrfs_trans_handle *trans;
1385         struct btrfs_extent_item *ei;
1386         struct btrfs_extent_inline_ref *iref;
1387         struct btrfs_extent_data_ref *dref;
1388         u64 bytenr;
1389         u64 num_bytes;
1390         u64 objectid;
1391         u64 last_byte;
1392         u64 first_free;
1393         u64 total_bytes;
1394         u64 flags = BTRFS_INODE_READONLY;
1395         u32 sectorsize = root->sectorsize;
1396
1397         total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
1398         first_free =  BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
1399         first_free &= ~((u64)sectorsize - 1);
1400         if (!datacsum)
1401                 flags |= BTRFS_INODE_NODATASUM;
1402
1403         memset(&btrfs_inode, 0, sizeof(btrfs_inode));
1404         btrfs_set_stack_inode_generation(&btrfs_inode, 1);
1405         btrfs_set_stack_inode_size(&btrfs_inode, total_bytes);
1406         btrfs_set_stack_inode_nlink(&btrfs_inode, 1);
1407         btrfs_set_stack_inode_nbytes(&btrfs_inode, 0);
1408         btrfs_set_stack_inode_mode(&btrfs_inode, S_IFREG | 0400);
1409         btrfs_set_stack_inode_flags(&btrfs_inode,  flags);
1410         btrfs_init_path(&path);
1411         trans = btrfs_start_transaction(root, 1);
1412         BUG_ON(!trans);
1413
1414         objectid = btrfs_root_dirid(&root->root_item);
1415         ret = btrfs_find_free_objectid(trans, root, objectid, &objectid);
1416         if (ret)
1417                 goto fail;
1418
1419         /*
1420          * copy blocks covered by extent #0 to new positions. extent #0 is
1421          * special, we can't rely on relocate_extents_range to relocate it.
1422          */
1423         for (last_byte = 0; last_byte < first_free; last_byte += sectorsize) {
1424                 ret = custom_alloc_extent(root, sectorsize, 0, &key, 0);
1425                 if (ret)
1426                         goto fail;
1427                 ret = copy_disk_extent(root, key.objectid, last_byte,
1428                                        sectorsize);
1429                 if (ret)
1430                         goto fail;
1431                 ret = btrfs_record_file_extent(trans, root, objectid,
1432                                                &btrfs_inode, last_byte,
1433                                                key.objectid, sectorsize);
1434                 if (ret)
1435                         goto fail;
1436                 if (datacsum) {
1437                         ret = csum_disk_extent(trans, root, key.objectid,
1438                                                sectorsize);
1439                         if (ret)
1440                                 goto fail;
1441                 }
1442         }
1443
1444         while(1) {
1445                 key.objectid = last_byte;
1446                 key.offset = 0;
1447                 btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
1448                 ret = btrfs_search_slot(trans, fs_info->extent_root,
1449                                         &key, &path, 0, 0);
1450                 if (ret < 0)
1451                         goto fail;
1452 next:
1453                 leaf = path.nodes[0];
1454                 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
1455                         ret = btrfs_next_leaf(extent_root, &path);
1456                         if (ret < 0)
1457                                 goto fail;
1458                         if (ret > 0)
1459                                 break;
1460                         leaf = path.nodes[0];
1461                 }
1462                 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
1463                 if (last_byte > key.objectid ||
1464                     key.type != BTRFS_EXTENT_ITEM_KEY) {
1465                         path.slots[0]++;
1466                         goto next;
1467                 }
1468
1469                 bytenr = key.objectid;
1470                 num_bytes = key.offset;
1471                 ei = btrfs_item_ptr(leaf, path.slots[0],
1472                                     struct btrfs_extent_item);
1473                 if (!(btrfs_extent_flags(leaf, ei) & BTRFS_EXTENT_FLAG_DATA)) {
1474                         path.slots[0]++;
1475                         goto next;
1476                 }
1477
1478                 BUG_ON(btrfs_item_size_nr(leaf, path.slots[0]) != sizeof(*ei) +
1479                        btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY));
1480
1481                 iref = (struct btrfs_extent_inline_ref *)(ei + 1);
1482                 key.type = btrfs_extent_inline_ref_type(leaf, iref);
1483                 BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
1484                 dref = (struct btrfs_extent_data_ref *)(&iref->offset);
1485                 if (btrfs_extent_data_ref_root(leaf, dref) !=
1486                     BTRFS_FS_TREE_OBJECTID) {
1487                         path.slots[0]++;
1488                         goto next;
1489                 }
1490
1491                 if (bytenr > last_byte) {
1492                         ret = create_image_file_range(trans, root, objectid,
1493                                                       &btrfs_inode, last_byte,
1494                                                       bytenr, cctx,
1495                                                       datacsum);
1496                         if (ret)
1497                                 goto fail;
1498                 }
1499                 ret = btrfs_record_file_extent(trans, root, objectid,
1500                                                &btrfs_inode, bytenr, bytenr,
1501                                                num_bytes);
1502                 if (ret)
1503                         goto fail;
1504                 last_byte = bytenr + num_bytes;
1505                 btrfs_release_path(&path);
1506
1507                 if (trans->blocks_used >= 4096) {
1508                         ret = btrfs_commit_transaction(trans, root);
1509                         BUG_ON(ret);
1510                         trans = btrfs_start_transaction(root, 1);
1511                         BUG_ON(!trans);
1512                 }
1513         }
1514         btrfs_release_path(&path);
1515         if (total_bytes > last_byte) {
1516                 ret = create_image_file_range(trans, root, objectid,
1517                                               &btrfs_inode, last_byte,
1518                                               total_bytes, cctx,
1519                                               datacsum);
1520                 if (ret)
1521                         goto fail;
1522         }
1523
1524         ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
1525         if (ret)
1526                 goto fail;
1527
1528         location.objectid = objectid;
1529         location.offset = 0;
1530         btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1531         ret = btrfs_insert_dir_item(trans, root, name, strlen(name),
1532                                     btrfs_root_dirid(&root->root_item),
1533                                     &location, BTRFS_FT_REG_FILE, objectid);
1534         if (ret)
1535                 goto fail;
1536         ret = btrfs_insert_inode_ref(trans, root, name, strlen(name),
1537                                      objectid,
1538                                      btrfs_root_dirid(&root->root_item),
1539                                      objectid);
1540         if (ret)
1541                 goto fail;
1542         location.objectid = btrfs_root_dirid(&root->root_item);
1543         location.offset = 0;
1544         btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
1545         ret = btrfs_lookup_inode(trans, root, &path, &location, 1);
1546         if (ret)
1547                 goto fail;
1548         leaf = path.nodes[0];
1549         inode_item = btrfs_item_ptr(leaf, path.slots[0],
1550                                     struct btrfs_inode_item);
1551         btrfs_set_inode_size(leaf, inode_item, strlen(name) * 2 +
1552                              btrfs_inode_size(leaf, inode_item));
1553         btrfs_mark_buffer_dirty(leaf);
1554         btrfs_release_path(&path);
1555         ret = btrfs_commit_transaction(trans, root);
1556         BUG_ON(ret);
1557 fail:
1558         btrfs_release_path(&path);
1559         return ret;
1560 }
1561
1562 static struct btrfs_root * link_subvol(struct btrfs_root *root,
1563                 const char *base, u64 root_objectid)
1564 {
1565         struct btrfs_trans_handle *trans;
1566         struct btrfs_fs_info *fs_info = root->fs_info;
1567         struct btrfs_root *tree_root = fs_info->tree_root;
1568         struct btrfs_root *new_root = NULL;
1569         struct btrfs_path *path;
1570         struct btrfs_inode_item *inode_item;
1571         struct extent_buffer *leaf;
1572         struct btrfs_key key;
1573         u64 dirid = btrfs_root_dirid(&root->root_item);
1574         u64 index = 2;
1575         char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
1576         int len;
1577         int i;
1578         int ret;
1579
1580         len = strlen(base);
1581         if (len == 0 || len > BTRFS_NAME_LEN)
1582                 return NULL;
1583
1584         path = btrfs_alloc_path();
1585         BUG_ON(!path);
1586
1587         key.objectid = dirid;
1588         key.type = BTRFS_DIR_INDEX_KEY;
1589         key.offset = (u64)-1;
1590
1591         ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1592         BUG_ON(ret <= 0);
1593
1594         if (path->slots[0] > 0) {
1595                 path->slots[0]--;
1596                 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1597                 if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
1598                         index = key.offset + 1;
1599         }
1600         btrfs_release_path(path);
1601
1602         trans = btrfs_start_transaction(root, 1);
1603         BUG_ON(!trans);
1604
1605         key.objectid = dirid;
1606         key.offset = 0;
1607         key.type =  BTRFS_INODE_ITEM_KEY;
1608
1609         ret = btrfs_lookup_inode(trans, root, path, &key, 1);
1610         BUG_ON(ret);
1611         leaf = path->nodes[0];
1612         inode_item = btrfs_item_ptr(leaf, path->slots[0],
1613                                     struct btrfs_inode_item);
1614
1615         key.objectid = root_objectid;
1616         key.offset = (u64)-1;
1617         key.type = BTRFS_ROOT_ITEM_KEY;
1618
1619         memcpy(buf, base, len);
1620         for (i = 0; i < 1024; i++) {
1621                 ret = btrfs_insert_dir_item(trans, root, buf, len,
1622                                             dirid, &key, BTRFS_FT_DIR, index);
1623                 if (ret != -EEXIST)
1624                         break;
1625                 len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
1626                 if (len < 1 || len > BTRFS_NAME_LEN) {
1627                         ret = -EINVAL;
1628                         break;
1629                 }
1630         }
1631         if (ret)
1632                 goto fail;
1633
1634         btrfs_set_inode_size(leaf, inode_item, len * 2 +
1635                              btrfs_inode_size(leaf, inode_item));
1636         btrfs_mark_buffer_dirty(leaf);
1637         btrfs_release_path(path);
1638
1639         /* add the backref first */
1640         ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
1641                                  BTRFS_ROOT_BACKREF_KEY,
1642                                  root->root_key.objectid,
1643                                  dirid, index, buf, len);
1644         BUG_ON(ret);
1645
1646         /* now add the forward ref */
1647         ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
1648                                  BTRFS_ROOT_REF_KEY, root_objectid,
1649                                  dirid, index, buf, len);
1650
1651         ret = btrfs_commit_transaction(trans, root);
1652         BUG_ON(ret);
1653
1654         new_root = btrfs_read_fs_root(fs_info, &key);
1655         if (IS_ERR(new_root))
1656                 new_root = NULL;
1657 fail:
1658         btrfs_free_path(path);
1659         return new_root;
1660 }
1661
1662 static int create_chunk_mapping(struct btrfs_trans_handle *trans,
1663                                 struct btrfs_root *root)
1664 {
1665         struct btrfs_fs_info *info = root->fs_info;
1666         struct btrfs_root *chunk_root = info->chunk_root;
1667         struct btrfs_root *extent_root = info->extent_root;
1668         struct btrfs_device *device;
1669         struct btrfs_block_group_cache *cache;
1670         struct btrfs_dev_extent *extent;
1671         struct extent_buffer *leaf;
1672         struct btrfs_chunk chunk;
1673         struct btrfs_key key;
1674         struct btrfs_path path;
1675         u64 cur_start;
1676         u64 total_bytes;
1677         u64 chunk_objectid;
1678         int ret;
1679
1680         btrfs_init_path(&path);
1681
1682         total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
1683         chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
1684
1685         BUG_ON(list_empty(&info->fs_devices->devices));
1686         device = list_entry(info->fs_devices->devices.next,
1687                             struct btrfs_device, dev_list);
1688         BUG_ON(device->devid != info->fs_devices->latest_devid);
1689
1690         /* delete device extent created by make_btrfs */
1691         key.objectid = device->devid;
1692         key.offset = 0;
1693         key.type = BTRFS_DEV_EXTENT_KEY;
1694         ret = btrfs_search_slot(trans, device->dev_root, &key, &path, -1, 1);
1695         if (ret < 0)
1696                 goto err;
1697
1698         BUG_ON(ret > 0);
1699         ret = btrfs_del_item(trans, device->dev_root, &path);
1700         if (ret)
1701                 goto err;
1702         btrfs_release_path(&path);
1703
1704         /* delete chunk item created by make_btrfs */
1705         key.objectid = chunk_objectid;
1706         key.offset = 0;
1707         key.type = BTRFS_CHUNK_ITEM_KEY;
1708         ret = btrfs_search_slot(trans, chunk_root, &key, &path, -1, 1);
1709         if (ret < 0)
1710                 goto err;
1711
1712         BUG_ON(ret > 0);
1713         ret = btrfs_del_item(trans, chunk_root, &path);
1714         if (ret)
1715                 goto err;
1716         btrfs_release_path(&path);
1717
1718         /* for each block group, create device extent and chunk item */
1719         cur_start = 0;
1720         while (cur_start < total_bytes) {
1721                 cache = btrfs_lookup_block_group(root->fs_info, cur_start);
1722                 BUG_ON(!cache);
1723
1724                 /* insert device extent */
1725                 key.objectid = device->devid;
1726                 key.offset = cache->key.objectid;
1727                 key.type = BTRFS_DEV_EXTENT_KEY;
1728                 ret = btrfs_insert_empty_item(trans, device->dev_root, &path,
1729                                               &key, sizeof(*extent));
1730                 if (ret)
1731                         goto err;
1732
1733                 leaf = path.nodes[0];
1734                 extent = btrfs_item_ptr(leaf, path.slots[0],
1735                                         struct btrfs_dev_extent);
1736
1737                 btrfs_set_dev_extent_chunk_tree(leaf, extent,
1738                                                 chunk_root->root_key.objectid);
1739                 btrfs_set_dev_extent_chunk_objectid(leaf, extent,
1740                                                     chunk_objectid);
1741                 btrfs_set_dev_extent_chunk_offset(leaf, extent,
1742                                                   cache->key.objectid);
1743                 btrfs_set_dev_extent_length(leaf, extent, cache->key.offset);
1744                 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
1745                     (unsigned long)btrfs_dev_extent_chunk_tree_uuid(extent),
1746                     BTRFS_UUID_SIZE);
1747                 btrfs_mark_buffer_dirty(leaf);
1748                 btrfs_release_path(&path);
1749
1750                 /* insert chunk item */
1751                 btrfs_set_stack_chunk_length(&chunk, cache->key.offset);
1752                 btrfs_set_stack_chunk_owner(&chunk,
1753                                             extent_root->root_key.objectid);
1754                 btrfs_set_stack_chunk_stripe_len(&chunk, BTRFS_STRIPE_LEN);
1755                 btrfs_set_stack_chunk_type(&chunk, cache->flags);
1756                 btrfs_set_stack_chunk_io_align(&chunk, device->io_align);
1757                 btrfs_set_stack_chunk_io_width(&chunk, device->io_width);
1758                 btrfs_set_stack_chunk_sector_size(&chunk, device->sector_size);
1759                 btrfs_set_stack_chunk_num_stripes(&chunk, 1);
1760                 btrfs_set_stack_chunk_sub_stripes(&chunk, 0);
1761                 btrfs_set_stack_stripe_devid(&chunk.stripe, device->devid);
1762                 btrfs_set_stack_stripe_offset(&chunk.stripe,
1763                                               cache->key.objectid);
1764                 memcpy(&chunk.stripe.dev_uuid, device->uuid, BTRFS_UUID_SIZE);
1765
1766                 key.objectid = chunk_objectid;
1767                 key.offset = cache->key.objectid;
1768                 key.type = BTRFS_CHUNK_ITEM_KEY;
1769
1770                 ret = btrfs_insert_item(trans, chunk_root, &key, &chunk,
1771                                         btrfs_chunk_item_size(1));
1772                 if (ret)
1773                         goto err;
1774
1775                 cur_start = cache->key.objectid + cache->key.offset;
1776         }
1777
1778         device->bytes_used = total_bytes;
1779         ret = btrfs_update_device(trans, device);
1780 err:
1781         btrfs_release_path(&path);
1782         return ret;
1783 }
1784
1785 static int create_subvol(struct btrfs_trans_handle *trans,
1786                          struct btrfs_root *root, u64 root_objectid)
1787 {
1788         struct extent_buffer *tmp;
1789         struct btrfs_root *new_root;
1790         struct btrfs_key key;
1791         struct btrfs_root_item root_item;
1792         int ret;
1793
1794         ret = btrfs_copy_root(trans, root, root->node, &tmp,
1795                               root_objectid);
1796         BUG_ON(ret);
1797
1798         memcpy(&root_item, &root->root_item, sizeof(root_item));
1799         btrfs_set_root_bytenr(&root_item, tmp->start);
1800         btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
1801         btrfs_set_root_generation(&root_item, trans->transid);
1802         free_extent_buffer(tmp);
1803
1804         key.objectid = root_objectid;
1805         key.type = BTRFS_ROOT_ITEM_KEY;
1806         key.offset = trans->transid;
1807         ret = btrfs_insert_root(trans, root->fs_info->tree_root,
1808                                 &key, &root_item);
1809
1810         key.offset = (u64)-1;
1811         new_root = btrfs_read_fs_root(root->fs_info, &key);
1812         BUG_ON(!new_root || IS_ERR(new_root));
1813
1814         ret = btrfs_make_root_dir(trans, new_root, BTRFS_FIRST_FREE_OBJECTID);
1815         BUG_ON(ret);
1816
1817         return 0;
1818 }
1819
1820 static int init_btrfs(struct btrfs_root *root)
1821 {
1822         int ret;
1823         struct btrfs_key location;
1824         struct btrfs_trans_handle *trans;
1825         struct btrfs_fs_info *fs_info = root->fs_info;
1826         struct extent_buffer *tmp;
1827
1828         trans = btrfs_start_transaction(root, 1);
1829         BUG_ON(!trans);
1830         ret = btrfs_make_block_groups(trans, root);
1831         if (ret)
1832                 goto err;
1833         ret = btrfs_fix_block_accounting(trans, root);
1834         if (ret)
1835                 goto err;
1836         ret = create_chunk_mapping(trans, root);
1837         if (ret)
1838                 goto err;
1839         ret = btrfs_make_root_dir(trans, fs_info->tree_root,
1840                                   BTRFS_ROOT_TREE_DIR_OBJECTID);
1841         if (ret)
1842                 goto err;
1843         memcpy(&location, &root->root_key, sizeof(location));
1844         location.offset = (u64)-1;
1845         ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7,
1846                                 btrfs_super_root_dir(fs_info->super_copy),
1847                                 &location, BTRFS_FT_DIR, 0);
1848         if (ret)
1849                 goto err;
1850         ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7,
1851                                 location.objectid,
1852                                 btrfs_super_root_dir(fs_info->super_copy), 0);
1853         if (ret)
1854                 goto err;
1855         btrfs_set_root_dirid(&fs_info->fs_root->root_item,
1856                              BTRFS_FIRST_FREE_OBJECTID);
1857
1858         /* subvol for fs image file */
1859         ret = create_subvol(trans, root, CONV_IMAGE_SUBVOL_OBJECTID);
1860         BUG_ON(ret);
1861         /* subvol for data relocation */
1862         ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID);
1863         BUG_ON(ret);
1864
1865         extent_buffer_get(fs_info->csum_root->node);
1866         ret = __btrfs_cow_block(trans, fs_info->csum_root,
1867                                 fs_info->csum_root->node, NULL, 0, &tmp, 0, 0);
1868         BUG_ON(ret);
1869         free_extent_buffer(tmp);
1870
1871         ret = btrfs_commit_transaction(trans, root);
1872         BUG_ON(ret);
1873 err:
1874         return ret;
1875 }
1876
1877 /*
1878  * Migrate super block to its default position and zero 0 ~ 16k
1879  */
1880 static int migrate_super_block(int fd, u64 old_bytenr, u32 sectorsize)
1881 {
1882         int ret;
1883         struct extent_buffer *buf;
1884         struct btrfs_super_block *super;
1885         u32 len;
1886         u32 bytenr;
1887
1888         BUG_ON(sectorsize < sizeof(*super));
1889         buf = malloc(sizeof(*buf) + sectorsize);
1890         if (!buf)
1891                 return -ENOMEM;
1892
1893         buf->len = sectorsize;
1894         ret = pread(fd, buf->data, sectorsize, old_bytenr);
1895         if (ret != sectorsize)
1896                 goto fail;
1897
1898         super = (struct btrfs_super_block *)buf->data;
1899         BUG_ON(btrfs_super_bytenr(super) != old_bytenr);
1900         btrfs_set_super_bytenr(super, BTRFS_SUPER_INFO_OFFSET);
1901
1902         csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1903         ret = pwrite(fd, buf->data, sectorsize, BTRFS_SUPER_INFO_OFFSET);
1904         if (ret != sectorsize)
1905                 goto fail;
1906
1907         ret = fsync(fd);
1908         if (ret)
1909                 goto fail;
1910
1911         memset(buf->data, 0, sectorsize);
1912         for (bytenr = 0; bytenr < BTRFS_SUPER_INFO_OFFSET; ) {
1913                 len = BTRFS_SUPER_INFO_OFFSET - bytenr;
1914                 if (len > sectorsize)
1915                         len = sectorsize;
1916                 ret = pwrite(fd, buf->data, len, bytenr);
1917                 if (ret != len) {
1918                         fprintf(stderr, "unable to zero fill device\n");
1919                         break;
1920                 }
1921                 bytenr += len;
1922         }
1923         ret = 0;
1924         fsync(fd);
1925 fail:
1926         free(buf);
1927         if (ret > 0)
1928                 ret = -1;
1929         return ret;
1930 }
1931
1932 static int prepare_system_chunk_sb(struct btrfs_super_block *super)
1933 {
1934         struct btrfs_chunk *chunk;
1935         struct btrfs_disk_key *key;
1936         u32 sectorsize = btrfs_super_sectorsize(super);
1937
1938         key = (struct btrfs_disk_key *)(super->sys_chunk_array);
1939         chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
1940                                        sizeof(struct btrfs_disk_key));
1941
1942         btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
1943         btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
1944         btrfs_set_disk_key_offset(key, 0);
1945
1946         btrfs_set_stack_chunk_length(chunk, btrfs_super_total_bytes(super));
1947         btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
1948         btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN);
1949         btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
1950         btrfs_set_stack_chunk_io_align(chunk, sectorsize);
1951         btrfs_set_stack_chunk_io_width(chunk, sectorsize);
1952         btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
1953         btrfs_set_stack_chunk_num_stripes(chunk, 1);
1954         btrfs_set_stack_chunk_sub_stripes(chunk, 0);
1955         chunk->stripe.devid = super->dev_item.devid;
1956         btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
1957         memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
1958         btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
1959         return 0;
1960 }
1961
1962 static int prepare_system_chunk(int fd, u64 sb_bytenr)
1963 {
1964         int ret;
1965         struct extent_buffer *buf;
1966         struct btrfs_super_block *super;
1967
1968         BUG_ON(BTRFS_SUPER_INFO_SIZE < sizeof(*super));
1969         buf = malloc(sizeof(*buf) + BTRFS_SUPER_INFO_SIZE);
1970         if (!buf)
1971                 return -ENOMEM;
1972
1973         buf->len = BTRFS_SUPER_INFO_SIZE;
1974         ret = pread(fd, buf->data, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1975         if (ret != BTRFS_SUPER_INFO_SIZE)
1976                 goto fail;
1977
1978         super = (struct btrfs_super_block *)buf->data;
1979         BUG_ON(btrfs_super_bytenr(super) != sb_bytenr);
1980         BUG_ON(btrfs_super_num_devices(super) != 1);
1981
1982         ret = prepare_system_chunk_sb(super);
1983         if (ret)
1984                 goto fail;
1985
1986         csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
1987         ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1988         if (ret != BTRFS_SUPER_INFO_SIZE)
1989                 goto fail;
1990
1991         ret = 0;
1992 fail:
1993         free(buf);
1994         if (ret > 0)
1995                 ret = -1;
1996         return ret;
1997 }
1998
1999 static int relocate_one_reference(struct btrfs_trans_handle *trans,
2000                                   struct btrfs_root *root,
2001                                   u64 extent_start, u64 extent_size,
2002                                   struct btrfs_key *extent_key,
2003                                   struct extent_io_tree *reloc_tree)
2004 {
2005         struct extent_buffer *leaf;
2006         struct btrfs_file_extent_item *fi;
2007         struct btrfs_key key;
2008         struct btrfs_path path;
2009         struct btrfs_inode_item inode;
2010         struct blk_iterate_data data;
2011         u64 bytenr;
2012         u64 num_bytes;
2013         u64 cur_offset;
2014         u64 new_pos;
2015         u64 nbytes;
2016         u64 sector_end;
2017         u32 sectorsize = root->sectorsize;
2018         unsigned long ptr;
2019         int datacsum;
2020         int fd;
2021         int ret;
2022
2023         btrfs_init_path(&path);
2024         ret = btrfs_search_slot(trans, root, extent_key, &path, -1, 1);
2025         if (ret)
2026                 goto fail;
2027
2028         leaf = path.nodes[0];
2029         fi = btrfs_item_ptr(leaf, path.slots[0],
2030                             struct btrfs_file_extent_item);
2031         BUG_ON(btrfs_file_extent_offset(leaf, fi) > 0);
2032         if (extent_start != btrfs_file_extent_disk_bytenr(leaf, fi) ||
2033             extent_size != btrfs_file_extent_disk_num_bytes(leaf, fi)) {
2034                 ret = 1;
2035                 goto fail;
2036         }
2037
2038         bytenr = extent_start + btrfs_file_extent_offset(leaf, fi);
2039         num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
2040
2041         ret = btrfs_del_item(trans, root, &path);
2042         if (ret)
2043                 goto fail;
2044
2045         ret = btrfs_free_extent(trans, root, extent_start, extent_size, 0,
2046                                 root->root_key.objectid,
2047                                 extent_key->objectid, extent_key->offset);
2048         if (ret)
2049                 goto fail;
2050
2051         btrfs_release_path(&path);
2052
2053         key.objectid = extent_key->objectid;
2054         key.offset = 0;
2055         key.type =  BTRFS_INODE_ITEM_KEY;
2056         ret = btrfs_lookup_inode(trans, root, &path, &key, 0);
2057         if (ret)
2058                 goto fail;
2059
2060         leaf = path.nodes[0];
2061         ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2062         read_extent_buffer(leaf, &inode, ptr, sizeof(inode));
2063         btrfs_release_path(&path);
2064
2065         BUG_ON(num_bytes & (sectorsize - 1));
2066         nbytes = btrfs_stack_inode_nbytes(&inode) - num_bytes;
2067         btrfs_set_stack_inode_nbytes(&inode, nbytes);
2068         datacsum = !(btrfs_stack_inode_flags(&inode) & BTRFS_INODE_NODATASUM);
2069
2070         init_blk_iterate_data(&data, trans, root, &inode, extent_key->objectid,
2071                               datacsum);
2072         data.first_block = extent_key->offset;
2073
2074         cur_offset = extent_key->offset;
2075         while (num_bytes > 0) {
2076                 sector_end = bytenr + sectorsize - 1;
2077                 if (test_range_bit(reloc_tree, bytenr, sector_end,
2078                                    EXTENT_LOCKED, 1)) {
2079                         ret = get_state_private(reloc_tree, bytenr, &new_pos);
2080                         BUG_ON(ret);
2081                 } else {
2082                         ret = custom_alloc_extent(root, sectorsize, 0, &key, 0);
2083                         if (ret)
2084                                 goto fail;
2085                         new_pos = key.objectid;
2086
2087                         if (cur_offset == extent_key->offset) {
2088                                 fd = root->fs_info->fs_devices->latest_bdev;
2089                                 readahead(fd, bytenr, num_bytes);
2090                         }
2091                         ret = copy_disk_extent(root, new_pos, bytenr,
2092                                                sectorsize);
2093                         if (ret)
2094                                 goto fail;
2095                         ret = set_extent_bits(reloc_tree, bytenr, sector_end,
2096                                               EXTENT_LOCKED, GFP_NOFS);
2097                         BUG_ON(ret);
2098                         ret = set_state_private(reloc_tree, bytenr, new_pos);
2099                         BUG_ON(ret);
2100                 }
2101
2102                 ret = block_iterate_proc(new_pos / sectorsize,
2103                                          cur_offset / sectorsize, &data);
2104                 if (ret < 0)
2105                         goto fail;
2106
2107                 cur_offset += sectorsize;
2108                 bytenr += sectorsize;
2109                 num_bytes -= sectorsize;
2110         }
2111
2112         if (data.num_blocks > 0) {
2113                 ret = record_file_blocks(&data, data.first_block,
2114                                          data.disk_block, data.num_blocks);
2115                 if (ret)
2116                         goto fail;
2117         }
2118
2119         key.objectid = extent_key->objectid;
2120         key.offset = 0;
2121         key.type =  BTRFS_INODE_ITEM_KEY;
2122         ret = btrfs_lookup_inode(trans, root, &path, &key, 1);
2123         if (ret)
2124                 goto fail;
2125
2126         leaf = path.nodes[0];
2127         ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2128         write_extent_buffer(leaf, &inode, ptr, sizeof(inode));
2129         btrfs_mark_buffer_dirty(leaf);
2130         btrfs_release_path(&path);
2131
2132 fail:
2133         btrfs_release_path(&path);
2134         return ret;
2135 }
2136
2137 static int relocate_extents_range(struct btrfs_root *fs_root,
2138                                   struct btrfs_root *image_root,
2139                                   u64 start_byte, u64 end_byte)
2140 {
2141         struct btrfs_fs_info *info = fs_root->fs_info;
2142         struct btrfs_root *extent_root = info->extent_root;
2143         struct btrfs_root *cur_root = NULL;
2144         struct btrfs_trans_handle *trans;
2145         struct btrfs_extent_data_ref *dref;
2146         struct btrfs_extent_inline_ref *iref;
2147         struct btrfs_extent_item *ei;
2148         struct extent_buffer *leaf;
2149         struct btrfs_key key;
2150         struct btrfs_key extent_key;
2151         struct btrfs_path path;
2152         struct extent_io_tree reloc_tree;
2153         unsigned long ptr;
2154         unsigned long end;
2155         u64 cur_byte;
2156         u64 num_bytes;
2157         u64 ref_root;
2158         u64 num_extents;
2159         int pass = 0;
2160         int ret;
2161
2162         btrfs_init_path(&path);
2163         extent_io_tree_init(&reloc_tree);
2164
2165         key.objectid = start_byte;
2166         key.offset = 0;
2167         key.type = BTRFS_EXTENT_ITEM_KEY;
2168         ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0);
2169         if (ret < 0)
2170                 goto fail;
2171         if (ret > 0) {
2172                 ret = btrfs_previous_item(extent_root, &path, 0,
2173                                           BTRFS_EXTENT_ITEM_KEY);
2174                 if (ret < 0)
2175                         goto fail;
2176                 if (ret == 0) {
2177                         leaf = path.nodes[0];
2178                         btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2179                         if (key.objectid + key.offset > start_byte)
2180                                 start_byte = key.objectid;
2181                 }
2182         }
2183         btrfs_release_path(&path);
2184 again:
2185         cur_root = (pass % 2 == 0) ? image_root : fs_root;
2186         num_extents = 0;
2187
2188         trans = btrfs_start_transaction(cur_root, 1);
2189         BUG_ON(!trans);
2190
2191         cur_byte = start_byte;
2192         while (1) {
2193                 key.objectid = cur_byte;
2194                 key.offset = 0;
2195                 key.type = BTRFS_EXTENT_ITEM_KEY;
2196                 ret = btrfs_search_slot(trans, extent_root,
2197                                         &key, &path, 0, 0);
2198                 if (ret < 0)
2199                         goto fail;
2200 next:
2201                 leaf = path.nodes[0];
2202                 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2203                         ret = btrfs_next_leaf(extent_root, &path);
2204                         if (ret < 0)
2205                                 goto fail;
2206                         if (ret > 0)
2207                                 break;
2208                         leaf = path.nodes[0];
2209                 }
2210
2211                 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2212                 if (key.objectid < cur_byte ||
2213                     key.type != BTRFS_EXTENT_ITEM_KEY) {
2214                         path.slots[0]++;
2215                         goto next;
2216                 }
2217                 if (key.objectid >= end_byte)
2218                         break;
2219
2220                 num_extents++;
2221
2222                 cur_byte = key.objectid;
2223                 num_bytes = key.offset;
2224                 ei = btrfs_item_ptr(leaf, path.slots[0],
2225                                     struct btrfs_extent_item);
2226                 BUG_ON(!(btrfs_extent_flags(leaf, ei) &
2227                          BTRFS_EXTENT_FLAG_DATA));
2228
2229                 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2230                 end = ptr + btrfs_item_size_nr(leaf, path.slots[0]);
2231
2232                 ptr += sizeof(struct btrfs_extent_item);
2233
2234                 while (ptr < end) {
2235                         iref = (struct btrfs_extent_inline_ref *)ptr;
2236                         key.type = btrfs_extent_inline_ref_type(leaf, iref);
2237                         BUG_ON(key.type != BTRFS_EXTENT_DATA_REF_KEY);
2238                         dref = (struct btrfs_extent_data_ref *)(&iref->offset);
2239                         ref_root = btrfs_extent_data_ref_root(leaf, dref);
2240                         extent_key.objectid =
2241                                 btrfs_extent_data_ref_objectid(leaf, dref);
2242                         extent_key.offset =
2243                                 btrfs_extent_data_ref_offset(leaf, dref);
2244                         extent_key.type = BTRFS_EXTENT_DATA_KEY;
2245                         BUG_ON(btrfs_extent_data_ref_count(leaf, dref) != 1);
2246
2247                         if (ref_root == cur_root->root_key.objectid)
2248                                 break;
2249
2250                         ptr += btrfs_extent_inline_ref_size(key.type);
2251                 }
2252
2253                 if (ptr >= end) {
2254                         path.slots[0]++;
2255                         goto next;
2256                 }
2257
2258                 ret = relocate_one_reference(trans, cur_root, cur_byte,
2259                                              num_bytes, &extent_key,
2260                                              &reloc_tree);
2261                 if (ret < 0)
2262                         goto fail;
2263
2264                 cur_byte += num_bytes;
2265                 btrfs_release_path(&path);
2266
2267                 if (trans->blocks_used >= 4096) {
2268                         ret = btrfs_commit_transaction(trans, cur_root);
2269                         BUG_ON(ret);
2270                         trans = btrfs_start_transaction(cur_root, 1);
2271                         BUG_ON(!trans);
2272                 }
2273         }
2274         btrfs_release_path(&path);
2275
2276         ret = btrfs_commit_transaction(trans, cur_root);
2277         BUG_ON(ret);
2278
2279         if (num_extents > 0 && pass++ < 16)
2280                 goto again;
2281
2282         ret = (num_extents > 0) ? -1 : 0;
2283 fail:
2284         btrfs_release_path(&path);
2285         extent_io_tree_cleanup(&reloc_tree);
2286         return ret;
2287 }
2288
2289 /*
2290  * relocate data in system chunk
2291  */
2292 static int cleanup_sys_chunk(struct btrfs_root *fs_root,
2293                              struct btrfs_root *image_root)
2294 {
2295         struct btrfs_block_group_cache *cache;
2296         int i, ret = 0;
2297         u64 offset = 0;
2298         u64 end_byte;
2299
2300         while(1) {
2301                 cache = btrfs_lookup_block_group(fs_root->fs_info, offset);
2302                 if (!cache)
2303                         break;
2304
2305                 end_byte = cache->key.objectid + cache->key.offset;
2306                 if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
2307                         ret = relocate_extents_range(fs_root, image_root,
2308                                                      cache->key.objectid,
2309                                                      end_byte);
2310                         if (ret)
2311                                 goto fail;
2312                 }
2313                 offset = end_byte;
2314         }
2315         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2316                 offset = btrfs_sb_offset(i);
2317                 offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
2318
2319                 ret = relocate_extents_range(fs_root, image_root,
2320                                              offset, offset + BTRFS_STRIPE_LEN);
2321                 if (ret)
2322                         goto fail;
2323         }
2324         ret = 0;
2325 fail:
2326         return ret;
2327 }
2328
2329 static int fixup_chunk_mapping(struct btrfs_root *root)
2330 {
2331         struct btrfs_trans_handle *trans;
2332         struct btrfs_fs_info *info = root->fs_info;
2333         struct btrfs_root *chunk_root = info->chunk_root;
2334         struct extent_buffer *leaf;
2335         struct btrfs_key key;
2336         struct btrfs_path path;
2337         struct btrfs_chunk chunk;
2338         unsigned long ptr;
2339         u32 size;
2340         u64 type;
2341         int ret;
2342
2343         btrfs_init_path(&path);
2344
2345         trans = btrfs_start_transaction(root, 1);
2346         BUG_ON(!trans);
2347
2348         /*
2349          * recow the whole chunk tree. this will move all chunk tree blocks
2350          * into system block group.
2351          */
2352         memset(&key, 0, sizeof(key));
2353         while (1) {
2354                 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2355                 if (ret < 0)
2356                         goto err;
2357
2358                 ret = btrfs_next_leaf(chunk_root, &path);
2359                 if (ret < 0)
2360                         goto err;
2361                 if (ret > 0)
2362                         break;
2363
2364                 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2365                 btrfs_release_path(&path);
2366         }
2367         btrfs_release_path(&path);
2368
2369         /* fixup the system chunk array in super block */
2370         btrfs_set_super_sys_array_size(info->super_copy, 0);
2371
2372         key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2373         key.offset = 0;
2374         key.type = BTRFS_CHUNK_ITEM_KEY;
2375
2376         ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 0);
2377         if (ret < 0)
2378                 goto err;
2379         BUG_ON(ret != 0);
2380         while(1) {
2381                 leaf = path.nodes[0];
2382                 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2383                         ret = btrfs_next_leaf(chunk_root, &path);
2384                         if (ret < 0)
2385                                 goto err;
2386                         if (ret > 0)
2387                                 break;
2388                         leaf = path.nodes[0];
2389                 }
2390                 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2391                 if (key.type != BTRFS_CHUNK_ITEM_KEY)
2392                         goto next;
2393
2394                 ptr = btrfs_item_ptr_offset(leaf, path.slots[0]);
2395                 size = btrfs_item_size_nr(leaf, path.slots[0]);
2396                 BUG_ON(size != sizeof(chunk));
2397                 read_extent_buffer(leaf, &chunk, ptr, size);
2398                 type = btrfs_stack_chunk_type(&chunk);
2399
2400                 if (!(type & BTRFS_BLOCK_GROUP_SYSTEM))
2401                         goto next;
2402
2403                 ret = btrfs_add_system_chunk(trans, chunk_root, &key,
2404                                              &chunk, size);
2405                 if (ret)
2406                         goto err;
2407 next:
2408                 path.slots[0]++;
2409         }
2410
2411         ret = btrfs_commit_transaction(trans, root);
2412         BUG_ON(ret);
2413 err:
2414         btrfs_release_path(&path);
2415         return ret;
2416 }
2417
2418 static const struct btrfs_convert_operations ext2_convert_ops = {
2419         .name                   = "ext2",
2420         .open_fs                = ext2_open_fs,
2421         .alloc_block            = ext2_alloc_block,
2422         .alloc_block_range      = ext2_alloc_block_range,
2423         .copy_inodes            = ext2_copy_inodes,
2424         .test_block             = ext2_test_block,
2425         .free_block             = ext2_free_block,
2426         .free_block_range       = ext2_free_block_range,
2427         .close_fs               = ext2_close_fs,
2428 };
2429
2430 static const struct btrfs_convert_operations *convert_operations[] = {
2431         &ext2_convert_ops,
2432 };
2433
2434 static int convert_open_fs(const char *devname,
2435                            struct btrfs_convert_context *cctx)
2436 {
2437         int i;
2438
2439         memset(cctx, 0, sizeof(*cctx));
2440
2441         for (i = 0; i < ARRAY_SIZE(convert_operations); i++) {
2442                 int ret = convert_operations[i]->open_fs(cctx, devname);
2443
2444                 if (ret == 0) {
2445                         cctx->convert_ops = convert_operations[i];
2446                         return ret;
2447                 }
2448         }
2449
2450         fprintf(stderr, "No file system found to convert.\n");
2451         return -1;
2452 }
2453
2454 static int do_convert(const char *devname, int datacsum, int packing, int noxattr,
2455                 u32 nodesize, int copylabel, const char *fslabel, int progress,
2456                 u64 features)
2457 {
2458         int i, ret, blocks_per_node;
2459         int fd = -1;
2460         int is_btrfs = 0;
2461         u32 blocksize;
2462         u64 blocks[7];
2463         u64 total_bytes;
2464         u64 super_bytenr;
2465         struct btrfs_root *root;
2466         struct btrfs_root *image_root;
2467         struct btrfs_convert_context cctx;
2468         char *subvol_name = NULL;
2469         struct task_ctx ctx;
2470         char features_buf[64];
2471         struct btrfs_mkfs_config mkfs_cfg;
2472
2473         init_convert_context(&cctx);
2474         ret = convert_open_fs(devname, &cctx);
2475         if (ret)
2476                 goto fail;
2477
2478         blocksize = cctx.blocksize;
2479         total_bytes = (u64)blocksize * (u64)cctx.block_count;
2480         if (blocksize < 4096) {
2481                 fprintf(stderr, "block size is too small\n");
2482                 goto fail;
2483         }
2484         if (btrfs_check_nodesize(nodesize, blocksize, features))
2485                 goto fail;
2486         blocks_per_node = nodesize / blocksize;
2487         ret = -blocks_per_node;
2488         for (i = 0; i < 7; i++) {
2489                 if (nodesize == blocksize)
2490                         ret = convert_alloc_block(&cctx, 0, blocks + i);
2491                 else
2492                         ret = convert_alloc_block_range(&cctx,
2493                                         ret + blocks_per_node, blocks_per_node,
2494                                         blocks + i);
2495                 if (ret) {
2496                         fprintf(stderr, "not enough free space\n");
2497                         goto fail;
2498                 }
2499                 blocks[i] *= blocksize;
2500         }
2501         super_bytenr = blocks[0];
2502         fd = open(devname, O_RDWR);
2503         if (fd < 0) {
2504                 fprintf(stderr, "unable to open %s\n", devname);
2505                 goto fail;
2506         }
2507         btrfs_parse_features_to_string(features_buf, features);
2508         if (features == BTRFS_MKFS_DEFAULT_FEATURES)
2509                 strcat(features_buf, " (default)");
2510
2511         printf("create btrfs filesystem:\n");
2512         printf("\tblocksize: %u\n", blocksize);
2513         printf("\tnodesize:  %u\n", nodesize);
2514         printf("\tfeatures:  %s\n", features_buf);
2515
2516         mkfs_cfg.label = cctx.volume_name;
2517         mkfs_cfg.fs_uuid = NULL;
2518         memcpy(mkfs_cfg.blocks, blocks, sizeof(blocks));
2519         mkfs_cfg.num_bytes = total_bytes;
2520         mkfs_cfg.nodesize = nodesize;
2521         mkfs_cfg.sectorsize = blocksize;
2522         mkfs_cfg.stripesize = blocksize;
2523         mkfs_cfg.features = features;
2524
2525         ret = make_btrfs(fd, &mkfs_cfg);
2526         if (ret) {
2527                 fprintf(stderr, "unable to create initial ctree: %s\n",
2528                         strerror(-ret));
2529                 goto fail;
2530         }
2531         /* create a system chunk that maps the whole device */
2532         ret = prepare_system_chunk(fd, super_bytenr);
2533         if (ret) {
2534                 fprintf(stderr, "unable to update system chunk\n");
2535                 goto fail;
2536         }
2537         root = open_ctree_fd(fd, devname, super_bytenr, OPEN_CTREE_WRITES);
2538         if (!root) {
2539                 fprintf(stderr, "unable to open ctree\n");
2540                 goto fail;
2541         }
2542         ret = cache_free_extents(root, &cctx);
2543         if (ret) {
2544                 fprintf(stderr, "error during cache_free_extents %d\n", ret);
2545                 goto fail;
2546         }
2547         root->fs_info->extent_ops = &extent_ops;
2548         /* recover block allocation bitmap */
2549         for (i = 0; i < 7; i++) {
2550                 blocks[i] /= blocksize;
2551                 if (nodesize == blocksize)
2552                         convert_free_block(&cctx, blocks[i]);
2553                 else
2554                         convert_free_block_range(&cctx, blocks[i],
2555                                         blocks_per_node);
2556         }
2557         ret = init_btrfs(root);
2558         if (ret) {
2559                 fprintf(stderr, "unable to setup the root tree\n");
2560                 goto fail;
2561         }
2562         printf("creating btrfs metadata.\n");
2563         ctx.max_copy_inodes = (cctx.inodes_count - cctx.free_inodes_count);
2564         ctx.cur_copy_inodes = 0;
2565
2566         if (progress) {
2567                 ctx.info = task_init(print_copied_inodes, after_copied_inodes, &ctx);
2568                 task_start(ctx.info);
2569         }
2570         ret = copy_inodes(&cctx, root, datacsum, packing, noxattr, &ctx);
2571         if (ret) {
2572                 fprintf(stderr, "error during copy_inodes %d\n", ret);
2573                 goto fail;
2574         }
2575         if (progress) {
2576                 task_stop(ctx.info);
2577                 task_deinit(ctx.info);
2578         }
2579
2580         printf("creating %s image file.\n", cctx.convert_ops->name);
2581         ret = asprintf(&subvol_name, "%s_saved", cctx.convert_ops->name);
2582         if (ret < 0) {
2583                 fprintf(stderr, "error allocating subvolume name: %s_saved\n",
2584                         cctx.convert_ops->name);
2585                 goto fail;
2586         }
2587
2588         image_root = link_subvol(root, subvol_name, CONV_IMAGE_SUBVOL_OBJECTID);
2589
2590         free(subvol_name);
2591
2592         if (!image_root) {
2593                 fprintf(stderr, "unable to create subvol\n");
2594                 goto fail;
2595         }
2596         ret = create_image(&cctx, image_root, "image", datacsum);
2597         if (ret) {
2598                 fprintf(stderr, "error during create_image %d\n", ret);
2599                 goto fail;
2600         }
2601         memset(root->fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
2602         if (copylabel == 1) {
2603                 __strncpy_null(root->fs_info->super_copy->label,
2604                                 cctx.volume_name, BTRFS_LABEL_SIZE - 1);
2605                 fprintf(stderr, "copy label '%s'\n",
2606                                 root->fs_info->super_copy->label);
2607         } else if (copylabel == -1) {
2608                 strcpy(root->fs_info->super_copy->label, fslabel);
2609                 fprintf(stderr, "set label to '%s'\n", fslabel);
2610         }
2611
2612         printf("cleaning up system chunk.\n");
2613         ret = cleanup_sys_chunk(root, image_root);
2614         if (ret) {
2615                 fprintf(stderr, "error during cleanup_sys_chunk %d\n", ret);
2616                 goto fail;
2617         }
2618         ret = close_ctree(root);
2619         if (ret) {
2620                 fprintf(stderr, "error during close_ctree %d\n", ret);
2621                 goto fail;
2622         }
2623         convert_close_fs(&cctx);
2624         clean_convert_context(&cctx);
2625
2626         /*
2627          * If this step succeed, we get a mountable btrfs. Otherwise
2628          * the source fs is left unchanged.
2629          */
2630         ret = migrate_super_block(fd, super_bytenr, blocksize);
2631         if (ret) {
2632                 fprintf(stderr, "unable to migrate super block\n");
2633                 goto fail;
2634         }
2635         is_btrfs = 1;
2636
2637         root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2638         if (!root) {
2639                 fprintf(stderr, "unable to open ctree\n");
2640                 goto fail;
2641         }
2642         /* move chunk tree into system chunk. */
2643         ret = fixup_chunk_mapping(root);
2644         if (ret) {
2645                 fprintf(stderr, "error during fixup_chunk_tree\n");
2646                 goto fail;
2647         }
2648         ret = close_ctree(root);
2649         close(fd);
2650
2651         printf("conversion complete.\n");
2652         return 0;
2653 fail:
2654         clean_convert_context(&cctx);
2655         if (fd != -1)
2656                 close(fd);
2657         if (is_btrfs)
2658                 fprintf(stderr,
2659                         "WARNING: an error occured during chunk mapping fixup, filesystem mountable but not finalized\n");
2660         else
2661                 fprintf(stderr, "conversion aborted\n");
2662         return -1;
2663 }
2664
2665 static int may_rollback(struct btrfs_root *root)
2666 {
2667         struct btrfs_fs_info *info = root->fs_info;
2668         struct btrfs_multi_bio *multi = NULL;
2669         u64 bytenr;
2670         u64 length;
2671         u64 physical;
2672         u64 total_bytes;
2673         int num_stripes;
2674         int ret;
2675
2676         if (btrfs_super_num_devices(info->super_copy) != 1)
2677                 goto fail;
2678
2679         bytenr = BTRFS_SUPER_INFO_OFFSET;
2680         total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
2681
2682         while (1) {
2683                 ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr,
2684                                       &length, &multi, 0, NULL);
2685                 if (ret) {
2686                         if (ret == -ENOENT) {
2687                                 /* removed block group at the tail */
2688                                 if (length == (u64)-1)
2689                                         break;
2690
2691                                 /* removed block group in the middle */
2692                                 goto next;
2693                         }
2694                         goto fail;
2695                 }
2696
2697                 num_stripes = multi->num_stripes;
2698                 physical = multi->stripes[0].physical;
2699                 kfree(multi);
2700
2701                 if (num_stripes != 1 || physical != bytenr)
2702                         goto fail;
2703 next:
2704                 bytenr += length;
2705                 if (bytenr >= total_bytes)
2706                         break;
2707         }
2708         return 0;
2709 fail:
2710         return -1;
2711 }
2712
2713 static int do_rollback(const char *devname)
2714 {
2715         int fd = -1;
2716         int ret;
2717         int i;
2718         struct btrfs_root *root;
2719         struct btrfs_root *image_root;
2720         struct btrfs_root *chunk_root;
2721         struct btrfs_dir_item *dir;
2722         struct btrfs_inode_item *inode;
2723         struct btrfs_file_extent_item *fi;
2724         struct btrfs_trans_handle *trans;
2725         struct extent_buffer *leaf;
2726         struct btrfs_block_group_cache *cache1;
2727         struct btrfs_block_group_cache *cache2;
2728         struct btrfs_key key;
2729         struct btrfs_path path;
2730         struct extent_io_tree io_tree;
2731         char *buf = NULL;
2732         char *name;
2733         u64 bytenr;
2734         u64 num_bytes;
2735         u64 root_dir;
2736         u64 objectid;
2737         u64 offset;
2738         u64 start;
2739         u64 end;
2740         u64 sb_bytenr;
2741         u64 first_free;
2742         u64 total_bytes;
2743         u32 sectorsize;
2744
2745         extent_io_tree_init(&io_tree);
2746
2747         fd = open(devname, O_RDWR);
2748         if (fd < 0) {
2749                 fprintf(stderr, "unable to open %s\n", devname);
2750                 goto fail;
2751         }
2752         root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
2753         if (!root) {
2754                 fprintf(stderr, "unable to open ctree\n");
2755                 goto fail;
2756         }
2757         ret = may_rollback(root);
2758         if (ret < 0) {
2759                 fprintf(stderr, "unable to do rollback\n");
2760                 goto fail;
2761         }
2762
2763         sectorsize = root->sectorsize;
2764         buf = malloc(sectorsize);
2765         if (!buf) {
2766                 fprintf(stderr, "unable to allocate memory\n");
2767                 goto fail;
2768         }
2769
2770         btrfs_init_path(&path);
2771
2772         key.objectid = CONV_IMAGE_SUBVOL_OBJECTID;
2773         key.type = BTRFS_ROOT_BACKREF_KEY;
2774         key.offset = BTRFS_FS_TREE_OBJECTID;
2775         ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, &path, 0,
2776                                 0);
2777         btrfs_release_path(&path);
2778         if (ret > 0) {
2779                 fprintf(stderr,
2780                 "ERROR: unable to convert ext2 image subvolume, is it deleted?\n");
2781                 goto fail;
2782         } else if (ret < 0) {
2783                 fprintf(stderr,
2784                         "ERROR: unable to open ext2_saved, id=%llu: %s\n",
2785                         (unsigned long long)key.objectid, strerror(-ret));
2786                 goto fail;
2787         }
2788
2789         key.objectid = CONV_IMAGE_SUBVOL_OBJECTID;
2790         key.type = BTRFS_ROOT_ITEM_KEY;
2791         key.offset = (u64)-1;
2792         image_root = btrfs_read_fs_root(root->fs_info, &key);
2793         if (!image_root || IS_ERR(image_root)) {
2794                 fprintf(stderr, "unable to open subvol %llu\n",
2795                         (unsigned long long)key.objectid);
2796                 goto fail;
2797         }
2798
2799         name = "image";
2800         root_dir = btrfs_root_dirid(&root->root_item);
2801         dir = btrfs_lookup_dir_item(NULL, image_root, &path,
2802                                    root_dir, name, strlen(name), 0);
2803         if (!dir || IS_ERR(dir)) {
2804                 fprintf(stderr, "unable to find file %s\n", name);
2805                 goto fail;
2806         }
2807         leaf = path.nodes[0];
2808         btrfs_dir_item_key_to_cpu(leaf, dir, &key);
2809         btrfs_release_path(&path);
2810
2811         objectid = key.objectid;
2812
2813         ret = btrfs_lookup_inode(NULL, image_root, &path, &key, 0);
2814         if (ret) {
2815                 fprintf(stderr, "unable to find inode item\n");
2816                 goto fail;
2817         }
2818         leaf = path.nodes[0];
2819         inode = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item);
2820         total_bytes = btrfs_inode_size(leaf, inode);
2821         btrfs_release_path(&path);
2822
2823         key.objectid = objectid;
2824         key.offset = 0;
2825         btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2826         ret = btrfs_search_slot(NULL, image_root, &key, &path, 0, 0);
2827         if (ret != 0) {
2828                 fprintf(stderr, "unable to find first file extent\n");
2829                 btrfs_release_path(&path);
2830                 goto fail;
2831         }
2832
2833         /* build mapping tree for the relocated blocks */
2834         for (offset = 0; offset < total_bytes; ) {
2835                 leaf = path.nodes[0];
2836                 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
2837                         ret = btrfs_next_leaf(root, &path);
2838                         if (ret != 0)
2839                                 break;
2840                         continue;
2841                 }
2842
2843                 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
2844                 if (key.objectid != objectid || key.offset != offset ||
2845                     btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
2846                         break;
2847
2848                 fi = btrfs_item_ptr(leaf, path.slots[0],
2849                                     struct btrfs_file_extent_item);
2850                 if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
2851                         break;
2852                 if (btrfs_file_extent_compression(leaf, fi) ||
2853                     btrfs_file_extent_encryption(leaf, fi) ||
2854                     btrfs_file_extent_other_encoding(leaf, fi))
2855                         break;
2856
2857                 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
2858                 /* skip holes and direct mapped extents */
2859                 if (bytenr == 0 || bytenr == offset)
2860                         goto next_extent;
2861
2862                 bytenr += btrfs_file_extent_offset(leaf, fi);
2863                 num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
2864
2865                 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2866                 cache2 =  btrfs_lookup_block_group(root->fs_info,
2867                                                    offset + num_bytes - 1);
2868                 if (!cache1 || cache1 != cache2 ||
2869                     (!(cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM) &&
2870                      !intersect_with_sb(offset, num_bytes)))
2871                         break;
2872
2873                 set_extent_bits(&io_tree, offset, offset + num_bytes - 1,
2874                                 EXTENT_LOCKED, GFP_NOFS);
2875                 set_state_private(&io_tree, offset, bytenr);
2876 next_extent:
2877                 offset += btrfs_file_extent_num_bytes(leaf, fi);
2878                 path.slots[0]++;
2879         }
2880         btrfs_release_path(&path);
2881
2882         if (offset < total_bytes) {
2883                 fprintf(stderr, "unable to build extent mapping\n");
2884                 goto fail;
2885         }
2886
2887         first_free = BTRFS_SUPER_INFO_OFFSET + 2 * sectorsize - 1;
2888         first_free &= ~((u64)sectorsize - 1);
2889         /* backup for extent #0 should exist */
2890         if(!test_range_bit(&io_tree, 0, first_free - 1, EXTENT_LOCKED, 1)) {
2891                 fprintf(stderr, "no backup for the first extent\n");
2892                 goto fail;
2893         }
2894         /* force no allocation from system block group */
2895         root->fs_info->system_allocs = -1;
2896         trans = btrfs_start_transaction(root, 1);
2897         BUG_ON(!trans);
2898         /*
2899          * recow the whole chunk tree, this will remove all chunk tree blocks
2900          * from system block group
2901          */
2902         chunk_root = root->fs_info->chunk_root;
2903         memset(&key, 0, sizeof(key));
2904         while (1) {
2905                 ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
2906                 if (ret < 0)
2907                         break;
2908
2909                 ret = btrfs_next_leaf(chunk_root, &path);
2910                 if (ret)
2911                         break;
2912
2913                 btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
2914                 btrfs_release_path(&path);
2915         }
2916         btrfs_release_path(&path);
2917
2918         offset = 0;
2919         num_bytes = 0;
2920         while(1) {
2921                 cache1 = btrfs_lookup_block_group(root->fs_info, offset);
2922                 if (!cache1)
2923                         break;
2924
2925                 if (cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM)
2926                         num_bytes += btrfs_block_group_used(&cache1->item);
2927
2928                 offset = cache1->key.objectid + cache1->key.offset;
2929         }
2930         /* only extent #0 left in system block group? */
2931         if (num_bytes > first_free) {
2932                 fprintf(stderr, "unable to empty system block group\n");
2933                 goto fail;
2934         }
2935         /* create a system chunk that maps the whole device */
2936         ret = prepare_system_chunk_sb(root->fs_info->super_copy);
2937         if (ret) {
2938                 fprintf(stderr, "unable to update system chunk\n");
2939                 goto fail;
2940         }
2941
2942         ret = btrfs_commit_transaction(trans, root);
2943         BUG_ON(ret);
2944
2945         ret = close_ctree(root);
2946         if (ret) {
2947                 fprintf(stderr, "error during close_ctree %d\n", ret);
2948                 goto fail;
2949         }
2950
2951         /* zero btrfs super block mirrors */
2952         memset(buf, 0, sectorsize);
2953         for (i = 1 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
2954                 bytenr = btrfs_sb_offset(i);
2955                 if (bytenr >= total_bytes)
2956                         break;
2957                 ret = pwrite(fd, buf, sectorsize, bytenr);
2958                 if (ret != sectorsize) {
2959                         fprintf(stderr,
2960                                 "error during zeroing superblock %d: %d\n",
2961                                 i, ret);
2962                         goto fail;
2963                 }
2964         }
2965
2966         sb_bytenr = (u64)-1;
2967         /* copy all relocated blocks back */
2968         while(1) {
2969                 ret = find_first_extent_bit(&io_tree, 0, &start, &end,
2970                                             EXTENT_LOCKED);
2971                 if (ret)
2972                         break;
2973
2974                 ret = get_state_private(&io_tree, start, &bytenr);
2975                 BUG_ON(ret);
2976
2977                 clear_extent_bits(&io_tree, start, end, EXTENT_LOCKED,
2978                                   GFP_NOFS);
2979
2980                 while (start <= end) {
2981                         if (start == BTRFS_SUPER_INFO_OFFSET) {
2982                                 sb_bytenr = bytenr;
2983                                 goto next_sector;
2984                         }
2985                         ret = pread(fd, buf, sectorsize, bytenr);
2986                         if (ret < 0) {
2987                                 fprintf(stderr, "error during pread %d\n", ret);
2988                                 goto fail;
2989                         }
2990                         BUG_ON(ret != sectorsize);
2991                         ret = pwrite(fd, buf, sectorsize, start);
2992                         if (ret < 0) {
2993                                 fprintf(stderr, "error during pwrite %d\n", ret);
2994                                 goto fail;
2995                         }
2996                         BUG_ON(ret != sectorsize);
2997 next_sector:
2998                         start += sectorsize;
2999                         bytenr += sectorsize;
3000                 }
3001         }
3002
3003         ret = fsync(fd);
3004         if (ret) {
3005                 fprintf(stderr, "error during fsync %d\n", ret);
3006                 goto fail;
3007         }
3008         /*
3009          * finally, overwrite btrfs super block.
3010          */
3011         ret = pread(fd, buf, sectorsize, sb_bytenr);
3012         if (ret < 0) {
3013                 fprintf(stderr, "error during pread %d\n", ret);
3014                 goto fail;
3015         }
3016         BUG_ON(ret != sectorsize);
3017         ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
3018         if (ret < 0) {
3019                 fprintf(stderr, "error during pwrite %d\n", ret);
3020                 goto fail;
3021         }
3022         BUG_ON(ret != sectorsize);
3023         ret = fsync(fd);
3024         if (ret) {
3025                 fprintf(stderr, "error during fsync %d\n", ret);
3026                 goto fail;
3027         }
3028
3029         close(fd);
3030         free(buf);
3031         extent_io_tree_cleanup(&io_tree);
3032         printf("rollback complete.\n");
3033         return 0;
3034
3035 fail:
3036         if (fd != -1)
3037                 close(fd);
3038         free(buf);
3039         fprintf(stderr, "rollback aborted.\n");
3040         return -1;
3041 }
3042
3043 static void print_usage(void)
3044 {
3045         printf("usage: btrfs-convert [options] device\n");
3046         printf("options:\n");
3047         printf("\t-d|--no-datasum        disable data checksum, sets NODATASUM\n");
3048         printf("\t-i|--no-xattr          ignore xattrs and ACLs\n");
3049         printf("\t-n|--no-inline         disable inlining of small files to metadata\n");
3050         printf("\t-N|--nodesize SIZE     set filesystem metadata nodesize\n");
3051         printf("\t-r|--rollback          roll back to the original filesystem\n");
3052         printf("\t-l|--label LABEL       set filesystem label\n");
3053         printf("\t-L|--copy-label        use label from converted filesystem\n");
3054         printf("\t-p|--progress          show converting progress (default)\n");
3055         printf("\t-O|--features LIST     comma separated list of filesystem features\n");
3056         printf("\t--no-progress          show only overview, not the detailed progress\n");
3057 }
3058
3059 int main(int argc, char *argv[])
3060 {
3061         int ret;
3062         int packing = 1;
3063         int noxattr = 0;
3064         int datacsum = 1;
3065         u32 nodesize = max_t(u32, sysconf(_SC_PAGESIZE),
3066                         BTRFS_MKFS_DEFAULT_NODE_SIZE);
3067         int rollback = 0;
3068         int copylabel = 0;
3069         int usage_error = 0;
3070         int progress = 1;
3071         char *file;
3072         char fslabel[BTRFS_LABEL_SIZE];
3073         u64 features = BTRFS_MKFS_DEFAULT_FEATURES;
3074
3075         while(1) {
3076                 enum { GETOPT_VAL_NO_PROGRESS = 256 };
3077                 static const struct option long_options[] = {
3078                         { "no-progress", no_argument, NULL,
3079                                 GETOPT_VAL_NO_PROGRESS },
3080                         { "no-datasum", no_argument, NULL, 'd' },
3081                         { "no-inline", no_argument, NULL, 'n' },
3082                         { "no-xattr", no_argument, NULL, 'i' },
3083                         { "rollback", no_argument, NULL, 'r' },
3084                         { "features", required_argument, NULL, 'O' },
3085                         { "progress", no_argument, NULL, 'p' },
3086                         { "label", required_argument, NULL, 'l' },
3087                         { "copy-label", no_argument, NULL, 'L' },
3088                         { "nodesize", required_argument, NULL, 'N' },
3089                         { "help", no_argument, NULL, GETOPT_VAL_HELP},
3090                         { NULL, 0, NULL, 0 }
3091                 };
3092                 int c = getopt_long(argc, argv, "dinN:rl:LpO:", long_options, NULL);
3093
3094                 if (c < 0)
3095                         break;
3096                 switch(c) {
3097                         case 'd':
3098                                 datacsum = 0;
3099                                 break;
3100                         case 'i':
3101                                 noxattr = 1;
3102                                 break;
3103                         case 'n':
3104                                 packing = 0;
3105                                 break;
3106                         case 'N':
3107                                 nodesize = parse_size(optarg);
3108                                 break;
3109                         case 'r':
3110                                 rollback = 1;
3111                                 break;
3112                         case 'l':
3113                                 copylabel = -1;
3114                                 if (strlen(optarg) >= BTRFS_LABEL_SIZE) {
3115                                         fprintf(stderr,
3116                                 "WARNING: label too long, trimmed to %d bytes\n",
3117                                                 BTRFS_LABEL_SIZE - 1);
3118                                 }
3119                                 __strncpy_null(fslabel, optarg, BTRFS_LABEL_SIZE - 1);
3120                                 break;
3121                         case 'L':
3122                                 copylabel = 1;
3123                                 break;
3124                         case 'p':
3125                                 progress = 1;
3126                                 break;
3127                         case 'O': {
3128                                 char *orig = strdup(optarg);
3129                                 char *tmp = orig;
3130
3131                                 tmp = btrfs_parse_fs_features(tmp, &features);
3132                                 if (tmp) {
3133                                         fprintf(stderr,
3134                                                 "Unrecognized filesystem feature '%s'\n",
3135                                                         tmp);
3136                                         free(orig);
3137                                         exit(1);
3138                                 }
3139                                 free(orig);
3140                                 if (features & BTRFS_FEATURE_LIST_ALL) {
3141                                         btrfs_list_all_fs_features(
3142                                                 ~BTRFS_CONVERT_ALLOWED_FEATURES);
3143                                         exit(0);
3144                                 }
3145                                 if (features & ~BTRFS_CONVERT_ALLOWED_FEATURES) {
3146                                         char buf[64];
3147
3148                                         btrfs_parse_features_to_string(buf,
3149                                                 features & ~BTRFS_CONVERT_ALLOWED_FEATURES);
3150                                         fprintf(stderr,
3151                                                 "ERROR: features not allowed for convert: %s\n",
3152                                                 buf);
3153                                         exit(1);
3154                                 }
3155
3156                                 break;
3157                                 }
3158                         case GETOPT_VAL_NO_PROGRESS:
3159                                 progress = 0;
3160                                 break;
3161                         case GETOPT_VAL_HELP:
3162                         default:
3163                                 print_usage();
3164                                 return c != GETOPT_VAL_HELP;
3165                 }
3166         }
3167         set_argv0(argv);
3168         if (check_argc_exact(argc - optind, 1)) {
3169                 print_usage();
3170                 return 1;
3171         }
3172
3173         if (rollback && (!datacsum || noxattr || !packing)) {
3174                 fprintf(stderr,
3175                         "Usage error: -d, -i, -n options do not apply to rollback\n");
3176                 usage_error++;
3177         }
3178
3179         if (usage_error) {
3180                 print_usage();
3181                 return 1;
3182         }
3183
3184         file = argv[optind];
3185         ret = check_mounted(file);
3186         if (ret < 0) {
3187                 fprintf(stderr, "Could not check mount status: %s\n",
3188                         strerror(-ret));
3189                 return 1;
3190         } else if (ret) {
3191                 fprintf(stderr, "%s is mounted\n", file);
3192                 return 1;
3193         }
3194
3195         if (rollback) {
3196                 ret = do_rollback(file);
3197         } else {
3198                 ret = do_convert(file, datacsum, packing, noxattr, nodesize,
3199                                 copylabel, fslabel, progress, features);
3200         }
3201         if (ret)
3202                 return 1;
3203         return 0;
3204 }