convert/source-ext2.c

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public
   4  * License v2 as published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   9  * General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public
  12  * License along with this program; if not, write to the
  13  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  14  * Boston, MA 021110-1307, USA.
  15  */
  16
  17 #if BTRFSCONVERT_EXT2
  18
  19 #include "kerncompat.h"
  20 #include "disk-io.h"
  21 #include "transaction.h"
  22 #include "utils.h"
  23 #include "convert/common.h"
  24 #include "convert/source-ext2.h"
  25
  26 /*
  27  * Open Ext2fs in readonly mode, read block allocation bitmap and
  28  * inode bitmap into memory.
  29  */
  30 static int ext2_open_fs(struct btrfs_convert_context *cctx, const char *name)
  31 {
  32         errcode_t ret;
  33         ext2_filsys ext2_fs;
  34         ext2_ino_t ino;
  35         u32 ro_feature;
  36
  37         ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs);
  38         if (ret) {
  39                 fprintf(stderr, "ext2fs_open: %s\n", error_message(ret));
  40                 return -1;
  41         }
  42         /*
  43          * We need to know exactly the used space, some RO compat flags like
  44          * BIGALLOC will affect how used space is present.
  45          * So we need manuall check any unsupported RO compat flags
  46          */
  47         ro_feature = ext2_fs->super->s_feature_ro_compat;
  48         if (ro_feature & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
  49                 error(
  50 "unsupported RO features detected: %x, abort convert to avoid possible corruption",
  51                       ro_feature & ~EXT2_LIB_FEATURE_COMPAT_SUPP);
  52                 goto fail;
  53         }
  54         ret = ext2fs_read_inode_bitmap(ext2_fs);
  55         if (ret) {
  56                 fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n",
  57                         error_message(ret));
  58                 goto fail;
  59         }
  60         ret = ext2fs_read_block_bitmap(ext2_fs);
  61         if (ret) {
  62                 fprintf(stderr, "ext2fs_read_block_bitmap: %s\n",
  63                         error_message(ret));
  64                 goto fail;
  65         }
  66         /*
  67          * search each block group for a free inode. this set up
  68          * uninit block/inode bitmaps appropriately.
  69          */
  70         ino = 1;
  71         while (ino <= ext2_fs->super->s_inodes_count) {
  72                 ext2_ino_t foo;
  73                 ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo);
  74                 ino += EXT2_INODES_PER_GROUP(ext2_fs->super);
  75         }
  76
  77         if (!(ext2_fs->super->s_feature_incompat &
  78               EXT2_FEATURE_INCOMPAT_FILETYPE)) {
  79                 error("filetype feature is missing");
  80                 goto fail;
  81         }
  82
  83         cctx->fs_data = ext2_fs;
  84         cctx->blocksize = ext2_fs->blocksize;
  85         cctx->block_count = ext2_fs->super->s_blocks_count;
  86         cctx->total_bytes = ext2_fs->blocksize * ext2_fs->super->s_blocks_count;
  87         cctx->volume_name = strndup(ext2_fs->super->s_volume_name, 16);
  88         cctx->first_data_block = ext2_fs->super->s_first_data_block;
  89         cctx->inodes_count = ext2_fs->super->s_inodes_count;
  90         cctx->free_inodes_count = ext2_fs->super->s_free_inodes_count;
  91         return 0;
  92 fail:
  93         ext2fs_close(ext2_fs);
  94         return -1;
  95 }
  96
  97 static int __ext2_add_one_block(ext2_filsys fs, char *bitmap,
  98                                 unsigned long group_nr, struct cache_tree *used)
  99 {
 100         unsigned long offset;
 101         unsigned i;
 102         int ret = 0;
 103
 104         offset = fs->super->s_first_data_block;
 105         offset /= EXT2FS_CLUSTER_RATIO(fs);
 106         offset += group_nr * EXT2_CLUSTERS_PER_GROUP(fs->super);
 107         for (i = 0; i < EXT2_CLUSTERS_PER_GROUP(fs->super); i++) {
 108                 if ((i + offset) >= ext2fs_blocks_count(fs->super))
 109                         break;
 110
 111                 if (ext2fs_test_bit(i, bitmap)) {
 112                         u64 start;
 113
 114                         start = (i + offset) * EXT2FS_CLUSTER_RATIO(fs);
 115                         start *= fs->blocksize;
 116                         ret = add_merge_cache_extent(used, start,
 117                                                      fs->blocksize);
 118                         if (ret < 0)
 119                                 break;
 120                 }
 121         }
 122         return ret;
 123 }
 124
 125 /*
 126  * Read all used ext2 space into cctx->used cache tree
 127  */
 128 static int ext2_read_used_space(struct btrfs_convert_context *cctx)
 129 {
 130         ext2_filsys fs = (ext2_filsys)cctx->fs_data;
 131         blk64_t blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block);
 132         struct cache_tree *used_tree = &cctx->used;
 133         char *block_bitmap = NULL;
 134         unsigned long i;
 135         int block_nbytes;
 136         int ret = 0;
 137
 138         block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
 139         if (!block_nbytes) {
 140                 error("EXT2_CLUSTERS_PER_GROUP too small: %llu",
 141                         (unsigned long long)(EXT2_CLUSTERS_PER_GROUP(fs->super)));
 142                 return -EINVAL;
 143         }
 144
 145         block_bitmap = malloc(block_nbytes);
 146         if (!block_bitmap)
 147                 return -ENOMEM;
 148
 149         for (i = 0; i < fs->group_desc_count; i++) {
 150                 ret = ext2fs_get_block_bitmap_range(fs->block_map, blk_itr,
 151                                                 block_nbytes * 8, block_bitmap);
 152                 if (ret) {
 153                         error("fail to get bitmap from ext2, %s",
 154                               strerror(-ret));
 155                         break;
 156                 }
 157                 ret = __ext2_add_one_block(fs, block_bitmap, i, used_tree);
 158                 if (ret < 0) {
 159                         error("fail to build used space tree, %s",
 160                               strerror(-ret));
 161                         break;
 162                 }
 163                 blk_itr += EXT2_CLUSTERS_PER_GROUP(fs->super);
 164         }
 165
 166         free(block_bitmap);
 167         return ret;
 168 }
 169
 170 static void ext2_close_fs(struct btrfs_convert_context *cctx)
 171 {
 172         if (cctx->volume_name) {
 173                 free(cctx->volume_name);
 174                 cctx->volume_name = NULL;
 175         }
 176         ext2fs_close(cctx->fs_data);
 177 }
 178
 179 static u8 ext2_filetype_conversion_table[EXT2_FT_MAX] = {
 180         [EXT2_FT_UNKNOWN]       = BTRFS_FT_UNKNOWN,
 181         [EXT2_FT_REG_FILE]      = BTRFS_FT_REG_FILE,
 182         [EXT2_FT_DIR]           = BTRFS_FT_DIR,
 183         [EXT2_FT_CHRDEV]        = BTRFS_FT_CHRDEV,
 184         [EXT2_FT_BLKDEV]        = BTRFS_FT_BLKDEV,
 185         [EXT2_FT_FIFO]          = BTRFS_FT_FIFO,
 186         [EXT2_FT_SOCK]          = BTRFS_FT_SOCK,
 187         [EXT2_FT_SYMLINK]       = BTRFS_FT_SYMLINK,
 188 };
 189
 190 static int ext2_dir_iterate_proc(ext2_ino_t dir, int entry,
 191                             struct ext2_dir_entry *dirent,
 192                             int offset, int blocksize,
 193                             char *buf,void *priv_data)
 194 {
 195         int ret;
 196         int file_type;
 197         u64 objectid;
 198         char dotdot[] = "..";
 199         struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data;
 200         int name_len;
 201
 202         name_len = dirent->name_len & 0xFF;
 203
 204         objectid = dirent->inode + INO_OFFSET;
 205         if (!strncmp(dirent->name, dotdot, name_len)) {
 206                 if (name_len == 2) {
 207                         BUG_ON(idata->parent != 0);
 208                         idata->parent = objectid;
 209                 }
 210                 return 0;
 211         }
 212         if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO)
 213                 return 0;
 214
 215         file_type = dirent->name_len >> 8;
 216         BUG_ON(file_type > EXT2_FT_SYMLINK);
 217
 218         ret = convert_insert_dirent(idata->trans, idata->root, dirent->name,
 219                                     name_len, idata->objectid, objectid,
 220                                     ext2_filetype_conversion_table[file_type],
 221                                     idata->index_cnt, idata->inode);
 222         if (ret < 0) {
 223                 idata->errcode = ret;
 224                 return BLOCK_ABORT;
 225         }
 226
 227         idata->index_cnt++;
 228         return 0;
 229 }
 230
 231 static int ext2_create_dir_entries(struct btrfs_trans_handle *trans,
 232                               struct btrfs_root *root, u64 objectid,
 233                               struct btrfs_inode_item *btrfs_inode,
 234                               ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
 235 {
 236         int ret;
 237         errcode_t err;
 238         struct dir_iterate_data data = {
 239                 .trans          = trans,
 240                 .root           = root,
 241                 .inode          = btrfs_inode,
 242                 .objectid       = objectid,
 243                 .index_cnt      = 2,
 244                 .parent         = 0,
 245                 .errcode        = 0,
 246         };
 247
 248         err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL,
 249                                   ext2_dir_iterate_proc, &data);
 250         if (err)
 251                 goto error;
 252         ret = data.errcode;
 253         if (ret == 0 && data.parent == objectid) {
 254                 ret = btrfs_insert_inode_ref(trans, root, "..", 2,
 255                                              objectid, objectid, 0);
 256         }
 257         return ret;
 258 error:
 259         fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err));
 260         return -1;
 261 }
 262
 263 static int ext2_block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
 264                                 e2_blkcnt_t blockcnt, blk_t ref_block,
 265                                 int ref_offset, void *priv_data)
 266 {
 267         int ret;
 268         struct blk_iterate_data *idata;
 269         idata = (struct blk_iterate_data *)priv_data;
 270         ret = block_iterate_proc(*blocknr, blockcnt, idata);
 271         if (ret) {
 272                 idata->errcode = ret;
 273                 return BLOCK_ABORT;
 274         }
 275         return 0;
 276 }
 277
 278 /*
 279  * traverse file's data blocks, record these data blocks as file extents.
 280  */
 281 static int ext2_create_file_extents(struct btrfs_trans_handle *trans,
 282                                struct btrfs_root *root, u64 objectid,
 283                                struct btrfs_inode_item *btrfs_inode,
 284                                ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
 285                                u32 convert_flags)
 286 {
 287         int ret;
 288         char *buffer = NULL;
 289         errcode_t err;
 290         u32 last_block;
 291         u32 sectorsize = root->sectorsize;
 292         u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
 293         struct blk_iterate_data data;
 294
 295         init_blk_iterate_data(&data, trans, root, btrfs_inode, objectid,
 296                         convert_flags & CONVERT_FLAG_DATACSUM);
 297
 298         err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
 299                                     NULL, ext2_block_iterate_proc, &data);
 300         if (err)
 301                 goto error;
 302         ret = data.errcode;
 303         if (ret)
 304                 goto fail;
 305         if ((convert_flags & CONVERT_FLAG_INLINE_DATA) && data.first_block == 0
 306             && data.num_blocks > 0
 307             && inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
 308                 u64 num_bytes = data.num_blocks * sectorsize;
 309                 u64 disk_bytenr = data.disk_block * sectorsize;
 310                 u64 nbytes;
 311
 312                 buffer = malloc(num_bytes);
 313                 if (!buffer)
 314                         return -ENOMEM;
 315                 ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer);
 316                 if (ret)
 317                         goto fail;
 318                 if (num_bytes > inode_size)
 319                         num_bytes = inode_size;
 320                 ret = btrfs_insert_inline_extent(trans, root, objectid,
 321                                                  0, buffer, num_bytes);
 322                 if (ret)
 323                         goto fail;
 324                 nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes;
 325                 btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes);
 326         } else if (data.num_blocks > 0) {
 327                 ret = record_file_blocks(&data, data.first_block,
 328                                          data.disk_block, data.num_blocks);
 329                 if (ret)
 330                         goto fail;
 331         }
 332         data.first_block += data.num_blocks;
 333         last_block = (inode_size + sectorsize - 1) / sectorsize;
 334         if (last_block > data.first_block) {
 335                 ret = record_file_blocks(&data, data.first_block, 0,
 336                                          last_block - data.first_block);
 337         }
 338 fail:
 339         free(buffer);
 340         return ret;
 341 error:
 342         fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
 343         return -1;
 344 }
 345
 346 static int ext2_create_symbol_link(struct btrfs_trans_handle *trans,
 347                               struct btrfs_root *root, u64 objectid,
 348                               struct btrfs_inode_item *btrfs_inode,
 349                               ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
 350                               struct ext2_inode *ext2_inode)
 351 {
 352         int ret;
 353         char *pathname;
 354         u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
 355         if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) {
 356                 btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1);
 357                 ret = ext2_create_file_extents(trans, root, objectid,
 358                                 btrfs_inode, ext2_fs, ext2_ino,
 359                                 CONVERT_FLAG_DATACSUM |
 360                                 CONVERT_FLAG_INLINE_DATA);
 361                 btrfs_set_stack_inode_size(btrfs_inode, inode_size);
 362                 return ret;
 363         }
 364
 365         pathname = (char *)&(ext2_inode->i_block[0]);
 366         BUG_ON(pathname[inode_size] != 0);
 367         ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
 368                                          pathname, inode_size + 1);
 369         btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1);
 370         return ret;
 371 }
 372
 373 /*
 374  * Following xattr/acl related codes are based on codes in
 375  * fs/ext3/xattr.c and fs/ext3/acl.c
 376  */
 377 #define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr))
 378 #define EXT2_XATTR_BFIRST(ptr) \
 379         ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1))
 380 #define EXT2_XATTR_IHDR(inode) \
 381         ((struct ext2_ext_attr_header *) ((void *)(inode) + \
 382                 EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize))
 383 #define EXT2_XATTR_IFIRST(inode) \
 384         ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \
 385                 sizeof(EXT2_XATTR_IHDR(inode)->h_magic)))
 386
 387 static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry,
 388                                   const void *end)
 389 {
 390         struct ext2_ext_attr_entry *next;
 391
 392         while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
 393                 next = EXT2_EXT_ATTR_NEXT(entry);
 394                 if ((void *)next >= end)
 395                         return -EIO;
 396                 entry = next;
 397         }
 398         return 0;
 399 }
 400
 401 static int ext2_xattr_check_block(const char *buf, size_t size)
 402 {
 403         int error;
 404         struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf);
 405
 406         if (header->h_magic != EXT2_EXT_ATTR_MAGIC ||
 407             header->h_blocks != 1)
 408                 return -EIO;
 409         error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size);
 410         return error;
 411 }
 412
 413 static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry,
 414                                   size_t size)
 415 {
 416         size_t value_size = entry->e_value_size;
 417
 418         if (entry->e_value_block != 0 || value_size > size ||
 419             entry->e_value_offs + value_size > size)
 420                 return -EIO;
 421         return 0;
 422 }
 423
 424 static inline int ext2_acl_count(size_t size)
 425 {
 426         ssize_t s;
 427         size -= sizeof(ext2_acl_header);
 428         s = size - 4 * sizeof(ext2_acl_entry_short);
 429         if (s < 0) {
 430                 if (size % sizeof(ext2_acl_entry_short))
 431                         return -1;
 432                 return size / sizeof(ext2_acl_entry_short);
 433         } else {
 434                 if (s % sizeof(ext2_acl_entry))
 435                         return -1;
 436                 return s / sizeof(ext2_acl_entry) + 4;
 437         }
 438 }
 439
 440 static inline size_t acl_ea_size(int count)
 441 {
 442         return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry);
 443 }
 444
 445 static int ext2_acl_to_xattr(void *dst, const void *src,
 446                              size_t dst_size, size_t src_size)
 447 {
 448         int i, count;
 449         const void *end = src + src_size;
 450         acl_ea_header *ext_acl = (acl_ea_header *)dst;
 451         acl_ea_entry *dst_entry = ext_acl->a_entries;
 452         ext2_acl_entry *src_entry;
 453
 454         if (src_size < sizeof(ext2_acl_header))
 455                 goto fail;
 456         if (((ext2_acl_header *)src)->a_version !=
 457             cpu_to_le32(EXT2_ACL_VERSION))
 458                 goto fail;
 459         src += sizeof(ext2_acl_header);
 460         count = ext2_acl_count(src_size);
 461         if (count <= 0)
 462                 goto fail;
 463
 464         BUG_ON(dst_size < acl_ea_size(count));
 465         ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION);
 466         for (i = 0; i < count; i++, dst_entry++) {
 467                 src_entry = (ext2_acl_entry *)src;
 468                 if (src + sizeof(ext2_acl_entry_short) > end)
 469                         goto fail;
 470                 dst_entry->e_tag = src_entry->e_tag;
 471                 dst_entry->e_perm = src_entry->e_perm;
 472                 switch (le16_to_cpu(src_entry->e_tag)) {
 473                 case ACL_USER_OBJ:
 474                 case ACL_GROUP_OBJ:
 475                 case ACL_MASK:
 476                 case ACL_OTHER:
 477                         src += sizeof(ext2_acl_entry_short);
 478                         dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
 479                         break;
 480                 case ACL_USER:
 481                 case ACL_GROUP:
 482                         src += sizeof(ext2_acl_entry);
 483                         if (src > end)
 484                                 goto fail;
 485                         dst_entry->e_id = src_entry->e_id;
 486                         break;
 487                 default:
 488                         goto fail;
 489                 }
 490         }
 491         if (src != end)
 492                 goto fail;
 493         return 0;
 494 fail:
 495         return -EINVAL;
 496 }
 497
 498 static char *xattr_prefix_table[] = {
 499         [1] =   "user.",
 500         [2] =   "system.posix_acl_access",
 501         [3] =   "system.posix_acl_default",
 502         [4] =   "trusted.",
 503         [6] =   "security.",
 504 };
 505
 506 static int ext2_copy_single_xattr(struct btrfs_trans_handle *trans,
 507                              struct btrfs_root *root, u64 objectid,
 508                              struct ext2_ext_attr_entry *entry,
 509                              const void *data, u32 datalen)
 510 {
 511         int ret = 0;
 512         int name_len;
 513         int name_index;
 514         void *databuf = NULL;
 515         char namebuf[XATTR_NAME_MAX + 1];
 516
 517         name_index = entry->e_name_index;
 518         if (name_index >= ARRAY_SIZE(xattr_prefix_table) ||
 519             xattr_prefix_table[name_index] == NULL)
 520                 return -EOPNOTSUPP;
 521         name_len = strlen(xattr_prefix_table[name_index]) +
 522                    entry->e_name_len;
 523         if (name_len >= sizeof(namebuf))
 524                 return -ERANGE;
 525
 526         if (name_index == 2 || name_index == 3) {
 527                 size_t bufsize = acl_ea_size(ext2_acl_count(datalen));
 528                 databuf = malloc(bufsize);
 529                 if (!databuf)
 530                        return -ENOMEM;
 531                 ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen);
 532                 if (ret)
 533                         goto out;
 534                 data = databuf;
 535                 datalen = bufsize;
 536         }
 537         strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX);
 538         strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len);
 539         if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) -
 540             sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
 541                 fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n",
 542                         objectid - INO_OFFSET, name_len, namebuf);
 543                 goto out;
 544         }
 545         ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len,
 546                                       data, datalen, objectid);
 547 out:
 548         free(databuf);
 549         return ret;
 550 }
 551
 552 static int ext2_copy_extended_attrs(struct btrfs_trans_handle *trans,
 553                                struct btrfs_root *root, u64 objectid,
 554                                struct btrfs_inode_item *btrfs_inode,
 555                                ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
 556 {
 557         int ret = 0;
 558         int inline_ea = 0;
 559         errcode_t err;
 560         u32 datalen;
 561         u32 block_size = ext2_fs->blocksize;
 562         u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super);
 563         struct ext2_inode_large *ext2_inode;
 564         struct ext2_ext_attr_entry *entry;
 565         void *data;
 566         char *buffer = NULL;
 567         char inode_buf[EXT2_GOOD_OLD_INODE_SIZE];
 568
 569         if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) {
 570                 ext2_inode = (struct ext2_inode_large *)inode_buf;
 571         } else {
 572                 ext2_inode = (struct ext2_inode_large *)malloc(inode_size);
 573                 if (!ext2_inode)
 574                        return -ENOMEM;
 575         }
 576         err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode,
 577                                      inode_size);
 578         if (err) {
 579                 fprintf(stderr, "ext2fs_read_inode_full: %s\n",
 580                         error_message(err));
 581                 ret = -1;
 582                 goto out;
 583         }
 584
 585         if (ext2_ino > ext2_fs->super->s_first_ino &&
 586             inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
 587                 if (EXT2_GOOD_OLD_INODE_SIZE +
 588                     ext2_inode->i_extra_isize > inode_size) {
 589                         ret = -EIO;
 590                         goto out;
 591                 }
 592                 if (ext2_inode->i_extra_isize != 0 &&
 593                     EXT2_XATTR_IHDR(ext2_inode)->h_magic ==
 594                     EXT2_EXT_ATTR_MAGIC) {
 595                         inline_ea = 1;
 596                 }
 597         }
 598         if (inline_ea) {
 599                 int total;
 600                 void *end = (void *)ext2_inode + inode_size;
 601                 entry = EXT2_XATTR_IFIRST(ext2_inode);
 602                 total = end - (void *)entry;
 603                 ret = ext2_xattr_check_names(entry, end);
 604                 if (ret)
 605                         goto out;
 606                 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
 607                         ret = ext2_xattr_check_entry(entry, total);
 608                         if (ret)
 609                                 goto out;
 610                         data = (void *)EXT2_XATTR_IFIRST(ext2_inode) +
 611                                 entry->e_value_offs;
 612                         datalen = entry->e_value_size;
 613                         ret = ext2_copy_single_xattr(trans, root, objectid,
 614                                                 entry, data, datalen);
 615                         if (ret)
 616                                 goto out;
 617                         entry = EXT2_EXT_ATTR_NEXT(entry);
 618                 }
 619         }
 620
 621         if (ext2_inode->i_file_acl == 0)
 622                 goto out;
 623
 624         buffer = malloc(block_size);
 625         if (!buffer) {
 626                 ret = -ENOMEM;
 627                 goto out;
 628         }
 629         err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer);
 630         if (err) {
 631                 fprintf(stderr, "ext2fs_read_ext_attr: %s\n",
 632                         error_message(err));
 633                 ret = -1;
 634                 goto out;
 635         }
 636         ret = ext2_xattr_check_block(buffer, block_size);
 637         if (ret)
 638                 goto out;
 639
 640         entry = EXT2_XATTR_BFIRST(buffer);
 641         while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
 642                 ret = ext2_xattr_check_entry(entry, block_size);
 643                 if (ret)
 644                         goto out;
 645                 data = buffer + entry->e_value_offs;
 646                 datalen = entry->e_value_size;
 647                 ret = ext2_copy_single_xattr(trans, root, objectid,
 648                                         entry, data, datalen);
 649                 if (ret)
 650                         goto out;
 651                 entry = EXT2_EXT_ATTR_NEXT(entry);
 652         }
 653 out:
 654         free(buffer);
 655         if ((void *)ext2_inode != inode_buf)
 656                 free(ext2_inode);
 657         return ret;
 658 }
 659 #define MINORBITS       20
 660 #define MKDEV(ma, mi)   (((ma) << MINORBITS) | (mi))
 661
 662 static inline dev_t old_decode_dev(u16 val)
 663 {
 664         return MKDEV((val >> 8) & 255, val & 255);
 665 }
 666
 667 static inline dev_t new_decode_dev(u32 dev)
 668 {
 669         unsigned major = (dev & 0xfff00) >> 8;
 670         unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
 671         return MKDEV(major, minor);
 672 }
 673
 674 static void ext2_copy_inode_item(struct btrfs_inode_item *dst,
 675                            struct ext2_inode *src, u32 blocksize)
 676 {
 677         btrfs_set_stack_inode_generation(dst, 1);
 678         btrfs_set_stack_inode_sequence(dst, 0);
 679         btrfs_set_stack_inode_transid(dst, 1);
 680         btrfs_set_stack_inode_size(dst, src->i_size);
 681         btrfs_set_stack_inode_nbytes(dst, 0);
 682         btrfs_set_stack_inode_block_group(dst, 0);
 683         btrfs_set_stack_inode_nlink(dst, src->i_links_count);
 684         btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16));
 685         btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16));
 686         btrfs_set_stack_inode_mode(dst, src->i_mode);
 687         btrfs_set_stack_inode_rdev(dst, 0);
 688         btrfs_set_stack_inode_flags(dst, 0);
 689         btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime);
 690         btrfs_set_stack_timespec_nsec(&dst->atime, 0);
 691         btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime);
 692         btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
 693         btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime);
 694         btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
 695         btrfs_set_stack_timespec_sec(&dst->otime, 0);
 696         btrfs_set_stack_timespec_nsec(&dst->otime, 0);
 697
 698         if (S_ISDIR(src->i_mode)) {
 699                 btrfs_set_stack_inode_size(dst, 0);
 700                 btrfs_set_stack_inode_nlink(dst, 1);
 701         }
 702         if (S_ISREG(src->i_mode)) {
 703                 btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 |
 704                                            (u64)src->i_size);
 705         }
 706         if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) &&
 707             !S_ISLNK(src->i_mode)) {
 708                 if (src->i_block[0]) {
 709                         btrfs_set_stack_inode_rdev(dst,
 710                                 old_decode_dev(src->i_block[0]));
 711                 } else {
 712                         btrfs_set_stack_inode_rdev(dst,
 713                                 new_decode_dev(src->i_block[1]));
 714                 }
 715         }
 716         memset(&dst->reserved, 0, sizeof(dst->reserved));
 717 }
 718 static int ext2_check_state(struct btrfs_convert_context *cctx)
 719 {
 720         ext2_filsys fs = cctx->fs_data;
 721
 722         if (!(fs->super->s_state & EXT2_VALID_FS))
 723                 return 1;
 724         else if (fs->super->s_state & EXT2_ERROR_FS)
 725                 return 1;
 726         else
 727                 return 0;
 728 }
 729
 730 /* EXT2_*_FL to BTRFS_INODE_FLAG_* stringification helper */
 731 #define COPY_ONE_EXT2_FLAG(flags, ext2_inode, name) ({                  \
 732         if (ext2_inode->i_flags & EXT2_##name##_FL)                     \
 733                 flags |= BTRFS_INODE_##name;                            \
 734 })
 735
 736 /*
 737  * Convert EXT2_*_FL to corresponding BTRFS_INODE_* flags
 738  *
 739  * Only a subset of EXT_*_FL is supported in btrfs.
 740  */
 741 static void ext2_convert_inode_flags(struct btrfs_inode_item *dst,
 742                                      struct ext2_inode *src)
 743 {
 744         u64 flags = 0;
 745
 746         COPY_ONE_EXT2_FLAG(flags, src, APPEND);
 747         COPY_ONE_EXT2_FLAG(flags, src, SYNC);
 748         COPY_ONE_EXT2_FLAG(flags, src, IMMUTABLE);
 749         COPY_ONE_EXT2_FLAG(flags, src, NODUMP);
 750         COPY_ONE_EXT2_FLAG(flags, src, NOATIME);
 751         COPY_ONE_EXT2_FLAG(flags, src, DIRSYNC);
 752         btrfs_set_stack_inode_flags(dst, flags);
 753 }
 754
 755 /*
 756  * copy a single inode. do all the required works, such as cloning
 757  * inode item, creating file extents and creating directory entries.
 758  */
 759 static int ext2_copy_single_inode(struct btrfs_trans_handle *trans,
 760                              struct btrfs_root *root, u64 objectid,
 761                              ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
 762                              struct ext2_inode *ext2_inode,
 763                              u32 convert_flags)
 764 {
 765         int ret;
 766         struct btrfs_inode_item btrfs_inode;
 767
 768         if (ext2_inode->i_links_count == 0)
 769                 return 0;
 770
 771         ext2_copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize);
 772         if (!(convert_flags & CONVERT_FLAG_DATACSUM)
 773             && S_ISREG(ext2_inode->i_mode)) {
 774                 u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
 775                             BTRFS_INODE_NODATASUM;
 776                 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
 777         }
 778         ext2_convert_inode_flags(&btrfs_inode, ext2_inode);
 779
 780         switch (ext2_inode->i_mode & S_IFMT) {
 781         case S_IFREG:
 782                 ret = ext2_create_file_extents(trans, root, objectid,
 783                         &btrfs_inode, ext2_fs, ext2_ino, convert_flags);
 784                 break;
 785         case S_IFDIR:
 786                 ret = ext2_create_dir_entries(trans, root, objectid,
 787                                 &btrfs_inode, ext2_fs, ext2_ino);
 788                 break;
 789         case S_IFLNK:
 790                 ret = ext2_create_symbol_link(trans, root, objectid,
 791                                 &btrfs_inode, ext2_fs, ext2_ino, ext2_inode);
 792                 break;
 793         default:
 794                 ret = 0;
 795                 break;
 796         }
 797         if (ret)
 798                 return ret;
 799
 800         if (convert_flags & CONVERT_FLAG_XATTR) {
 801                 ret = ext2_copy_extended_attrs(trans, root, objectid,
 802                                 &btrfs_inode, ext2_fs, ext2_ino);
 803                 if (ret)
 804                         return ret;
 805         }
 806         return btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
 807 }
 808
 809 static int ext2_is_special_inode(ext2_ino_t ino)
 810 {
 811         if (ino < EXT2_GOOD_OLD_FIRST_INO && ino != EXT2_ROOT_INO)
 812                 return 1;
 813         return 0;
 814 }
 815
 816 /*
 817  * scan ext2's inode bitmap and copy all used inodes.
 818  */
 819 static int ext2_copy_inodes(struct btrfs_convert_context *cctx,
 820                             struct btrfs_root *root,
 821                             u32 convert_flags, struct task_ctx *p)
 822 {
 823         ext2_filsys ext2_fs = cctx->fs_data;
 824         int ret;
 825         errcode_t err;
 826         ext2_inode_scan ext2_scan;
 827         struct ext2_inode ext2_inode;
 828         ext2_ino_t ext2_ino;
 829         u64 objectid;
 830         struct btrfs_trans_handle *trans;
 831
 832         trans = btrfs_start_transaction(root, 1);
 833         if (!trans)
 834                 return -ENOMEM;
 835         err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan);
 836         if (err) {
 837                 fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err));
 838                 return -1;
 839         }
 840         while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino,
 841                                              &ext2_inode))) {
 842                 /* no more inodes */
 843                 if (ext2_ino == 0)
 844                         break;
 845                 if (ext2_is_special_inode(ext2_ino))
 846                         continue;
 847                 objectid = ext2_ino + INO_OFFSET;
 848                 ret = ext2_copy_single_inode(trans, root,
 849                                         objectid, ext2_fs, ext2_ino,
 850                                         &ext2_inode, convert_flags);
 851                 p->cur_copy_inodes++;
 852                 if (ret)
 853                         return ret;
 854                 if (trans->blocks_used >= 4096) {
 855                         ret = btrfs_commit_transaction(trans, root);
 856                         BUG_ON(ret);
 857                         trans = btrfs_start_transaction(root, 1);
 858                         BUG_ON(!trans);
 859                 }
 860         }
 861         if (err) {
 862                 fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err));
 863                 return -1;
 864         }
 865         ret = btrfs_commit_transaction(trans, root);
 866         BUG_ON(ret);
 867         ext2fs_close_inode_scan(ext2_scan);
 868
 869         return ret;
 870 }
 871
 872 const struct btrfs_convert_operations ext2_convert_ops = {
 873         .name                   = "ext2",
 874         .open_fs                = ext2_open_fs,
 875         .read_used_space        = ext2_read_used_space,
 876         .copy_inodes            = ext2_copy_inodes,
 877         .close_fs               = ext2_close_fs,
 878         .check_state            = ext2_check_state,
 879 };
 880
 881 #endif  /* BTRFSCONVERT_EXT2 */