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 <linux/limits.h>
  21 #include <pthread.h>
  22 #include "disk-io.h"
  23 #include "transaction.h"
  24 #include "utils.h"
  25 #include "convert/common.h"
  26 #include "convert/source-ext2.h"
  27
  28 /*
  29  * Open Ext2fs in readonly mode, read block allocation bitmap and
  30  * inode bitmap into memory.
  31  */
  32 static int ext2_open_fs(struct btrfs_convert_context *cctx, const char *name)
  33 {
  34         errcode_t ret;
  35         ext2_filsys ext2_fs;
  36         ext2_ino_t ino;
  37         u32 ro_feature;
  38         int open_flag = EXT2_FLAG_SOFTSUPP_FEATURES | EXT2_FLAG_64BITS;
  39
  40         ret = ext2fs_open(name, open_flag, 0, 0, unix_io_manager, &ext2_fs);
  41         if (ret) {
  42                 if (ret != EXT2_ET_BAD_MAGIC)
  43                         fprintf(stderr, "ext2fs_open: %s\n", error_message(ret));
  44                 return -1;
  45         }
  46         /*
  47          * We need to know exactly the used space, some RO compat flags like
  48          * BIGALLOC will affect how used space is present.
  49          * So we need manuall check any unsupported RO compat flags
  50          */
  51         ro_feature = ext2_fs->super->s_feature_ro_compat;
  52         if (ro_feature & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
  53                 error(
  54 "unsupported RO features detected: %x, abort convert to avoid possible corruption",
  55                       ro_feature & ~EXT2_LIB_FEATURE_COMPAT_SUPP);
  56                 goto fail;
  57         }
  58         ret = ext2fs_read_inode_bitmap(ext2_fs);
  59         if (ret) {
  60                 fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n",
  61                         error_message(ret));
  62                 goto fail;
  63         }
  64         ret = ext2fs_read_block_bitmap(ext2_fs);
  65         if (ret) {
  66                 fprintf(stderr, "ext2fs_read_block_bitmap: %s\n",
  67                         error_message(ret));
  68                 goto fail;
  69         }
  70         /*
  71          * search each block group for a free inode. this set up
  72          * uninit block/inode bitmaps appropriately.
  73          */
  74         ino = 1;
  75         while (ino <= ext2_fs->super->s_inodes_count) {
  76                 ext2_ino_t foo;
  77                 ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo);
  78                 ino += EXT2_INODES_PER_GROUP(ext2_fs->super);
  79         }
  80
  81         if (!(ext2_fs->super->s_feature_incompat &
  82               EXT2_FEATURE_INCOMPAT_FILETYPE)) {
  83                 error("filetype feature is missing");
  84                 goto fail;
  85         }
  86
  87         cctx->fs_data = ext2_fs;
  88         cctx->blocksize = ext2_fs->blocksize;
  89         cctx->block_count = ext2_fs->super->s_blocks_count;
  90         cctx->total_bytes = ext2_fs->blocksize * ext2_fs->super->s_blocks_count;
  91         cctx->volume_name = strndup(ext2_fs->super->s_volume_name, 16);
  92         cctx->first_data_block = ext2_fs->super->s_first_data_block;
  93         cctx->inodes_count = ext2_fs->super->s_inodes_count;
  94         cctx->free_inodes_count = ext2_fs->super->s_free_inodes_count;
  95         return 0;
  96 fail:
  97         ext2fs_close(ext2_fs);
  98         return -1;
  99 }
 100
 101 static int __ext2_add_one_block(ext2_filsys fs, char *bitmap,
 102                                 unsigned long group_nr, struct cache_tree *used)
 103 {
 104         unsigned long offset;
 105         unsigned i;
 106         int ret = 0;
 107
 108         offset = fs->super->s_first_data_block;
 109         offset /= EXT2FS_CLUSTER_RATIO(fs);
 110         offset += group_nr * EXT2_CLUSTERS_PER_GROUP(fs->super);
 111         for (i = 0; i < EXT2_CLUSTERS_PER_GROUP(fs->super); i++) {
 112                 if ((i + offset) >= ext2fs_blocks_count(fs->super))
 113                         break;
 114
 115                 if (ext2fs_test_bit(i, bitmap)) {
 116                         u64 start;
 117
 118                         start = (i + offset) * EXT2FS_CLUSTER_RATIO(fs);
 119                         start *= fs->blocksize;
 120                         ret = add_merge_cache_extent(used, start,
 121                                                      fs->blocksize);
 122                         if (ret < 0)
 123                                 break;
 124                 }
 125         }
 126         return ret;
 127 }
 128
 129 /*
 130  * Read all used ext2 space into cctx->used cache tree
 131  */
 132 static int ext2_read_used_space(struct btrfs_convert_context *cctx)
 133 {
 134         ext2_filsys fs = (ext2_filsys)cctx->fs_data;
 135         blk64_t blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block);
 136         struct cache_tree *used_tree = &cctx->used_space;
 137         char *block_bitmap = NULL;
 138         unsigned long i;
 139         int block_nbytes;
 140         int ret = 0;
 141
 142         block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
 143         if (!block_nbytes) {
 144                 error("EXT2_CLUSTERS_PER_GROUP too small: %llu",
 145                         (unsigned long long)(EXT2_CLUSTERS_PER_GROUP(fs->super)));
 146                 return -EINVAL;
 147         }
 148
 149         block_bitmap = malloc(block_nbytes);
 150         if (!block_bitmap)
 151                 return -ENOMEM;
 152
 153         for (i = 0; i < fs->group_desc_count; i++) {
 154                 ret = ext2fs_get_block_bitmap_range2(fs->block_map, blk_itr,
 155                                                 block_nbytes * 8, block_bitmap);
 156                 if (ret) {
 157                         error("fail to get bitmap from ext2, %s",
 158                               strerror(-ret));
 159                         break;
 160                 }
 161                 ret = __ext2_add_one_block(fs, block_bitmap, i, used_tree);
 162                 if (ret < 0) {
 163                         error("fail to build used space tree, %s",
 164                               strerror(-ret));
 165                         break;
 166                 }
 167                 blk_itr += EXT2_CLUSTERS_PER_GROUP(fs->super);
 168         }
 169
 170         free(block_bitmap);
 171         return ret;
 172 }
 173
 174 static void ext2_close_fs(struct btrfs_convert_context *cctx)
 175 {
 176         if (cctx->volume_name) {
 177                 free(cctx->volume_name);
 178                 cctx->volume_name = NULL;
 179         }
 180         ext2fs_close(cctx->fs_data);
 181 }
 182
 183 static u8 ext2_filetype_conversion_table[EXT2_FT_MAX] = {
 184         [EXT2_FT_UNKNOWN]       = BTRFS_FT_UNKNOWN,
 185         [EXT2_FT_REG_FILE]      = BTRFS_FT_REG_FILE,
 186         [EXT2_FT_DIR]           = BTRFS_FT_DIR,
 187         [EXT2_FT_CHRDEV]        = BTRFS_FT_CHRDEV,
 188         [EXT2_FT_BLKDEV]        = BTRFS_FT_BLKDEV,
 189         [EXT2_FT_FIFO]          = BTRFS_FT_FIFO,
 190         [EXT2_FT_SOCK]          = BTRFS_FT_SOCK,
 191         [EXT2_FT_SYMLINK]       = BTRFS_FT_SYMLINK,
 192 };
 193
 194 static int ext2_dir_iterate_proc(ext2_ino_t dir, int entry,
 195                             struct ext2_dir_entry *dirent,
 196                             int offset, int blocksize,
 197                             char *buf,void *priv_data)
 198 {
 199         int ret;
 200         int file_type;
 201         u64 objectid;
 202         char dotdot[] = "..";
 203         struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data;
 204         int name_len;
 205
 206         name_len = dirent->name_len & 0xFF;
 207
 208         objectid = dirent->inode + INO_OFFSET;
 209         if (!strncmp(dirent->name, dotdot, name_len)) {
 210                 if (name_len == 2) {
 211                         BUG_ON(idata->parent != 0);
 212                         idata->parent = objectid;
 213                 }
 214                 return 0;
 215         }
 216         if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO)
 217                 return 0;
 218
 219         file_type = dirent->name_len >> 8;
 220         BUG_ON(file_type > EXT2_FT_SYMLINK);
 221
 222         ret = convert_insert_dirent(idata->trans, idata->root, dirent->name,
 223                                     name_len, idata->objectid, objectid,
 224                                     ext2_filetype_conversion_table[file_type],
 225                                     idata->index_cnt, idata->inode);
 226         if (ret < 0) {
 227                 idata->errcode = ret;
 228                 return BLOCK_ABORT;
 229         }
 230
 231         idata->index_cnt++;
 232         return 0;
 233 }
 234
 235 static int ext2_create_dir_entries(struct btrfs_trans_handle *trans,
 236                               struct btrfs_root *root, u64 objectid,
 237                               struct btrfs_inode_item *btrfs_inode,
 238                               ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
 239 {
 240         int ret;
 241         errcode_t err;
 242         struct dir_iterate_data data = {
 243                 .trans          = trans,
 244                 .root           = root,
 245                 .inode          = btrfs_inode,
 246                 .objectid       = objectid,
 247                 .index_cnt      = 2,
 248                 .parent         = 0,
 249                 .errcode        = 0,
 250         };
 251
 252         err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL,
 253                                   ext2_dir_iterate_proc, &data);
 254         if (err)
 255                 goto error;
 256         ret = data.errcode;
 257         if (ret == 0 && data.parent == objectid) {
 258                 ret = btrfs_insert_inode_ref(trans, root, "..", 2,
 259                                              objectid, objectid, 0);
 260         }
 261         return ret;
 262 error:
 263         fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err));
 264         return -1;
 265 }
 266
 267 static int ext2_block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
 268                                 e2_blkcnt_t blockcnt, blk_t ref_block,
 269                                 int ref_offset, void *priv_data)
 270 {
 271         int ret;
 272         struct blk_iterate_data *idata;
 273         idata = (struct blk_iterate_data *)priv_data;
 274         ret = block_iterate_proc(*blocknr, blockcnt, idata);
 275         if (ret) {
 276                 idata->errcode = ret;
 277                 return BLOCK_ABORT;
 278         }
 279         return 0;
 280 }
 281
 282 /*
 283  * traverse file's data blocks, record these data blocks as file extents.
 284  */
 285 static int ext2_create_file_extents(struct btrfs_trans_handle *trans,
 286                                struct btrfs_root *root, u64 objectid,
 287                                struct btrfs_inode_item *btrfs_inode,
 288                                ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
 289                                u32 convert_flags)
 290 {
 291         int ret;
 292         char *buffer = NULL;
 293         errcode_t err;
 294         u32 last_block;
 295         u32 sectorsize = root->fs_info->sectorsize;
 296         u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
 297         struct blk_iterate_data data;
 298
 299         init_blk_iterate_data(&data, trans, root, btrfs_inode, objectid,
 300                         convert_flags & CONVERT_FLAG_DATACSUM);
 301
 302         err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
 303                                     NULL, ext2_block_iterate_proc, &data);
 304         if (err)
 305                 goto error;
 306         ret = data.errcode;
 307         if (ret)
 308                 goto fail;
 309         if ((convert_flags & CONVERT_FLAG_INLINE_DATA) && data.first_block == 0
 310             && data.num_blocks > 0
 311             && inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
 312                 u64 num_bytes = data.num_blocks * sectorsize;
 313                 u64 disk_bytenr = data.disk_block * sectorsize;
 314                 u64 nbytes;
 315
 316                 buffer = malloc(num_bytes);
 317                 if (!buffer)
 318                         return -ENOMEM;
 319                 ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer);
 320                 if (ret)
 321                         goto fail;
 322                 if (num_bytes > inode_size)
 323                         num_bytes = inode_size;
 324                 ret = btrfs_insert_inline_extent(trans, root, objectid,
 325                                                  0, buffer, num_bytes);
 326                 if (ret)
 327                         goto fail;
 328                 nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes;
 329                 btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes);
 330         } else if (data.num_blocks > 0) {
 331                 ret = record_file_blocks(&data, data.first_block,
 332                                          data.disk_block, data.num_blocks);
 333                 if (ret)
 334                         goto fail;
 335         }
 336         data.first_block += data.num_blocks;
 337         last_block = (inode_size + sectorsize - 1) / sectorsize;
 338         if (last_block > data.first_block) {
 339                 ret = record_file_blocks(&data, data.first_block, 0,
 340                                          last_block - data.first_block);
 341         }
 342 fail:
 343         free(buffer);
 344         return ret;
 345 error:
 346         fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
 347         return -1;
 348 }
 349
 350 static int ext2_create_symlink(struct btrfs_trans_handle *trans,
 351                               struct btrfs_root *root, u64 objectid,
 352                               struct btrfs_inode_item *btrfs_inode,
 353                               ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
 354                               struct ext2_inode *ext2_inode)
 355 {
 356         int ret;
 357         char *pathname;
 358         u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
 359         if (ext2fs_inode_data_blocks2(ext2_fs, ext2_inode)) {
 360                 btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1);
 361                 ret = ext2_create_file_extents(trans, root, objectid,
 362                                 btrfs_inode, ext2_fs, ext2_ino,
 363                                 CONVERT_FLAG_DATACSUM |
 364                                 CONVERT_FLAG_INLINE_DATA);
 365                 btrfs_set_stack_inode_size(btrfs_inode, inode_size);
 366                 return ret;
 367         }
 368
 369         pathname = (char *)&(ext2_inode->i_block[0]);
 370         BUG_ON(pathname[inode_size] != 0);
 371         ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
 372                                          pathname, inode_size + 1);
 373         btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1);
 374         return ret;
 375 }
 376
 377 /*
 378  * Following xattr/acl related codes are based on codes in
 379  * fs/ext3/xattr.c and fs/ext3/acl.c
 380  */
 381 #define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr))
 382 #define EXT2_XATTR_BFIRST(ptr) \
 383         ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1))
 384 #define EXT2_XATTR_IHDR(inode) \
 385         ((struct ext2_ext_attr_header *) ((void *)(inode) + \
 386                 EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize))
 387 #define EXT2_XATTR_IFIRST(inode) \
 388         ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \
 389                 sizeof(EXT2_XATTR_IHDR(inode)->h_magic)))
 390
 391 static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry,
 392                                   const void *end)
 393 {
 394         struct ext2_ext_attr_entry *next;
 395
 396         while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
 397                 next = EXT2_EXT_ATTR_NEXT(entry);
 398                 if ((void *)next >= end)
 399                         return -EIO;
 400                 entry = next;
 401         }
 402         return 0;
 403 }
 404
 405 static int ext2_xattr_check_block(const char *buf, size_t size)
 406 {
 407         int error;
 408         struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf);
 409
 410         if (header->h_magic != EXT2_EXT_ATTR_MAGIC ||
 411             header->h_blocks != 1)
 412                 return -EIO;
 413         error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size);
 414         return error;
 415 }
 416
 417 static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry,
 418                                   size_t size)
 419 {
 420         size_t value_size = entry->e_value_size;
 421
 422         if (entry->e_value_block != 0 || value_size > size ||
 423             entry->e_value_offs + value_size > size)
 424                 return -EIO;
 425         return 0;
 426 }
 427
 428 static int ext2_acl_to_xattr(void *dst, const void *src,
 429                              size_t dst_size, size_t src_size)
 430 {
 431         int i, count;
 432         const void *end = src + src_size;
 433         acl_ea_header *ext_acl = (acl_ea_header *)dst;
 434         acl_ea_entry *dst_entry = ext_acl->a_entries;
 435         ext2_acl_entry *src_entry;
 436
 437         if (src_size < sizeof(ext2_acl_header))
 438                 goto fail;
 439         if (((ext2_acl_header *)src)->a_version !=
 440             cpu_to_le32(EXT2_ACL_VERSION))
 441                 goto fail;
 442         src += sizeof(ext2_acl_header);
 443         count = ext2_acl_count(src_size);
 444         if (count <= 0)
 445                 goto fail;
 446
 447         BUG_ON(dst_size < acl_ea_size(count));
 448         ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION);
 449         for (i = 0; i < count; i++, dst_entry++) {
 450                 src_entry = (ext2_acl_entry *)src;
 451                 if (src + sizeof(ext2_acl_entry_short) > end)
 452                         goto fail;
 453                 dst_entry->e_tag = src_entry->e_tag;
 454                 dst_entry->e_perm = src_entry->e_perm;
 455                 switch (le16_to_cpu(src_entry->e_tag)) {
 456                 case ACL_USER_OBJ:
 457                 case ACL_GROUP_OBJ:
 458                 case ACL_MASK:
 459                 case ACL_OTHER:
 460                         src += sizeof(ext2_acl_entry_short);
 461                         dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
 462                         break;
 463                 case ACL_USER:
 464                 case ACL_GROUP:
 465                         src += sizeof(ext2_acl_entry);
 466                         if (src > end)
 467                                 goto fail;
 468                         dst_entry->e_id = src_entry->e_id;
 469                         break;
 470                 default:
 471                         goto fail;
 472                 }
 473         }
 474         if (src != end)
 475                 goto fail;
 476         return 0;
 477 fail:
 478         return -EINVAL;
 479 }
 480
 481 static char *xattr_prefix_table[] = {
 482         [1] =   "user.",
 483         [2] =   "system.posix_acl_access",
 484         [3] =   "system.posix_acl_default",
 485         [4] =   "trusted.",
 486         [6] =   "security.",
 487 };
 488
 489 static int ext2_copy_single_xattr(struct btrfs_trans_handle *trans,
 490                              struct btrfs_root *root, u64 objectid,
 491                              struct ext2_ext_attr_entry *entry,
 492                              const void *data, u32 datalen)
 493 {
 494         int ret = 0;
 495         int name_len;
 496         int name_index;
 497         void *databuf = NULL;
 498         char namebuf[XATTR_NAME_MAX + 1];
 499
 500         name_index = entry->e_name_index;
 501         if (name_index >= ARRAY_SIZE(xattr_prefix_table) ||
 502             xattr_prefix_table[name_index] == NULL)
 503                 return -EOPNOTSUPP;
 504         name_len = strlen(xattr_prefix_table[name_index]) +
 505                    entry->e_name_len;
 506         if (name_len >= sizeof(namebuf))
 507                 return -ERANGE;
 508
 509         if (name_index == 2 || name_index == 3) {
 510                 size_t bufsize = acl_ea_size(ext2_acl_count(datalen));
 511                 databuf = malloc(bufsize);
 512                 if (!databuf)
 513                        return -ENOMEM;
 514                 ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen);
 515                 if (ret)
 516                         goto out;
 517                 data = databuf;
 518                 datalen = bufsize;
 519         }
 520         strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX);
 521         strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len);
 522         if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) -
 523             sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) {
 524                 fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n",
 525                         objectid - INO_OFFSET, name_len, namebuf);
 526                 goto out;
 527         }
 528         ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len,
 529                                       data, datalen, objectid);
 530 out:
 531         free(databuf);
 532         return ret;
 533 }
 534
 535 static int ext2_copy_extended_attrs(struct btrfs_trans_handle *trans,
 536                                struct btrfs_root *root, u64 objectid,
 537                                struct btrfs_inode_item *btrfs_inode,
 538                                ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
 539 {
 540         int ret = 0;
 541         int inline_ea = 0;
 542         errcode_t err;
 543         u32 datalen;
 544         u32 block_size = ext2_fs->blocksize;
 545         u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super);
 546         struct ext2_inode_large *ext2_inode;
 547         struct ext2_ext_attr_entry *entry;
 548         void *data;
 549         char *buffer = NULL;
 550         char inode_buf[EXT2_GOOD_OLD_INODE_SIZE];
 551
 552         if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) {
 553                 ext2_inode = (struct ext2_inode_large *)inode_buf;
 554         } else {
 555                 ext2_inode = (struct ext2_inode_large *)malloc(inode_size);
 556                 if (!ext2_inode)
 557                        return -ENOMEM;
 558         }
 559         err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode,
 560                                      inode_size);
 561         if (err) {
 562                 fprintf(stderr, "ext2fs_read_inode_full: %s\n",
 563                         error_message(err));
 564                 ret = -1;
 565                 goto out;
 566         }
 567
 568         if (ext2_ino > ext2_fs->super->s_first_ino &&
 569             inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
 570                 if (EXT2_GOOD_OLD_INODE_SIZE +
 571                     ext2_inode->i_extra_isize > inode_size) {
 572                         ret = -EIO;
 573                         goto out;
 574                 }
 575                 if (ext2_inode->i_extra_isize != 0 &&
 576                     EXT2_XATTR_IHDR(ext2_inode)->h_magic ==
 577                     EXT2_EXT_ATTR_MAGIC) {
 578                         inline_ea = 1;
 579                 }
 580         }
 581         if (inline_ea) {
 582                 int total;
 583                 void *end = (void *)ext2_inode + inode_size;
 584                 entry = EXT2_XATTR_IFIRST(ext2_inode);
 585                 total = end - (void *)entry;
 586                 ret = ext2_xattr_check_names(entry, end);
 587                 if (ret)
 588                         goto out;
 589                 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
 590                         ret = ext2_xattr_check_entry(entry, total);
 591                         if (ret)
 592                                 goto out;
 593                         data = (void *)EXT2_XATTR_IFIRST(ext2_inode) +
 594                                 entry->e_value_offs;
 595                         datalen = entry->e_value_size;
 596                         ret = ext2_copy_single_xattr(trans, root, objectid,
 597                                                 entry, data, datalen);
 598                         if (ret)
 599                                 goto out;
 600                         entry = EXT2_EXT_ATTR_NEXT(entry);
 601                 }
 602         }
 603
 604         if (ext2_inode->i_file_acl == 0)
 605                 goto out;
 606
 607         buffer = malloc(block_size);
 608         if (!buffer) {
 609                 ret = -ENOMEM;
 610                 goto out;
 611         }
 612         err = ext2fs_read_ext_attr2(ext2_fs, ext2_inode->i_file_acl, buffer);
 613         if (err) {
 614                 fprintf(stderr, "ext2fs_read_ext_attr2: %s\n",
 615                         error_message(err));
 616                 ret = -1;
 617                 goto out;
 618         }
 619         ret = ext2_xattr_check_block(buffer, block_size);
 620         if (ret)
 621                 goto out;
 622
 623         entry = EXT2_XATTR_BFIRST(buffer);
 624         while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
 625                 ret = ext2_xattr_check_entry(entry, block_size);
 626                 if (ret)
 627                         goto out;
 628                 data = buffer + entry->e_value_offs;
 629                 datalen = entry->e_value_size;
 630                 ret = ext2_copy_single_xattr(trans, root, objectid,
 631                                         entry, data, datalen);
 632                 if (ret)
 633                         goto out;
 634                 entry = EXT2_EXT_ATTR_NEXT(entry);
 635         }
 636 out:
 637         free(buffer);
 638         if ((void *)ext2_inode != inode_buf)
 639                 free(ext2_inode);
 640         return ret;
 641 }
 642
 643 static inline dev_t old_decode_dev(u16 val)
 644 {
 645         return MKDEV((val >> 8) & 255, val & 255);
 646 }
 647
 648 static void ext2_copy_inode_item(struct btrfs_inode_item *dst,
 649                            struct ext2_inode *src, u32 blocksize)
 650 {
 651         btrfs_set_stack_inode_generation(dst, 1);
 652         btrfs_set_stack_inode_sequence(dst, 0);
 653         btrfs_set_stack_inode_transid(dst, 1);
 654         btrfs_set_stack_inode_size(dst, src->i_size);
 655         btrfs_set_stack_inode_nbytes(dst, 0);
 656         btrfs_set_stack_inode_block_group(dst, 0);
 657         btrfs_set_stack_inode_nlink(dst, src->i_links_count);
 658         btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16));
 659         btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16));
 660         btrfs_set_stack_inode_mode(dst, src->i_mode);
 661         btrfs_set_stack_inode_rdev(dst, 0);
 662         btrfs_set_stack_inode_flags(dst, 0);
 663         btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime);
 664         btrfs_set_stack_timespec_nsec(&dst->atime, 0);
 665         btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime);
 666         btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
 667         btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime);
 668         btrfs_set_stack_timespec_nsec(&dst->mtime, 0);
 669         btrfs_set_stack_timespec_sec(&dst->otime, 0);
 670         btrfs_set_stack_timespec_nsec(&dst->otime, 0);
 671
 672         if (S_ISDIR(src->i_mode)) {
 673                 btrfs_set_stack_inode_size(dst, 0);
 674                 btrfs_set_stack_inode_nlink(dst, 1);
 675         }
 676         if (S_ISREG(src->i_mode)) {
 677                 btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 |
 678                                            (u64)src->i_size);
 679         }
 680         if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) &&
 681             !S_ISLNK(src->i_mode)) {
 682                 if (src->i_block[0]) {
 683                         btrfs_set_stack_inode_rdev(dst,
 684                                 old_decode_dev(src->i_block[0]));
 685                 } else {
 686                         btrfs_set_stack_inode_rdev(dst,
 687                                 decode_dev(src->i_block[1]));
 688                 }
 689         }
 690         memset(&dst->reserved, 0, sizeof(dst->reserved));
 691 }
 692 static int ext2_check_state(struct btrfs_convert_context *cctx)
 693 {
 694         ext2_filsys fs = cctx->fs_data;
 695
 696         if (!(fs->super->s_state & EXT2_VALID_FS))
 697                 return 1;
 698         else if (fs->super->s_state & EXT2_ERROR_FS)
 699                 return 1;
 700         else
 701                 return 0;
 702 }
 703
 704 /* EXT2_*_FL to BTRFS_INODE_FLAG_* stringification helper */
 705 #define COPY_ONE_EXT2_FLAG(flags, ext2_inode, name) ({                  \
 706         if (ext2_inode->i_flags & EXT2_##name##_FL)                     \
 707                 flags |= BTRFS_INODE_##name;                            \
 708 })
 709
 710 /*
 711  * Convert EXT2_*_FL to corresponding BTRFS_INODE_* flags
 712  *
 713  * Only a subset of EXT_*_FL is supported in btrfs.
 714  */
 715 static void ext2_convert_inode_flags(struct btrfs_inode_item *dst,
 716                                      struct ext2_inode *src)
 717 {
 718         u64 flags = btrfs_stack_inode_flags(dst);
 719
 720         COPY_ONE_EXT2_FLAG(flags, src, APPEND);
 721         COPY_ONE_EXT2_FLAG(flags, src, SYNC);
 722         COPY_ONE_EXT2_FLAG(flags, src, IMMUTABLE);
 723         COPY_ONE_EXT2_FLAG(flags, src, NODUMP);
 724         COPY_ONE_EXT2_FLAG(flags, src, NOATIME);
 725         COPY_ONE_EXT2_FLAG(flags, src, DIRSYNC);
 726         btrfs_set_stack_inode_flags(dst, flags);
 727 }
 728
 729 /*
 730  * copy a single inode. do all the required works, such as cloning
 731  * inode item, creating file extents and creating directory entries.
 732  */
 733 static int ext2_copy_single_inode(struct btrfs_trans_handle *trans,
 734                              struct btrfs_root *root, u64 objectid,
 735                              ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
 736                              struct ext2_inode *ext2_inode,
 737                              u32 convert_flags)
 738 {
 739         int ret;
 740         struct btrfs_inode_item btrfs_inode;
 741
 742         if (ext2_inode->i_links_count == 0)
 743                 return 0;
 744
 745         ext2_copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize);
 746         if (!(convert_flags & CONVERT_FLAG_DATACSUM)
 747             && S_ISREG(ext2_inode->i_mode)) {
 748                 u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
 749                             BTRFS_INODE_NODATASUM;
 750                 btrfs_set_stack_inode_flags(&btrfs_inode, flags);
 751         }
 752         ext2_convert_inode_flags(&btrfs_inode, ext2_inode);
 753
 754         switch (ext2_inode->i_mode & S_IFMT) {
 755         case S_IFREG:
 756                 ret = ext2_create_file_extents(trans, root, objectid,
 757                         &btrfs_inode, ext2_fs, ext2_ino, convert_flags);
 758                 break;
 759         case S_IFDIR:
 760                 ret = ext2_create_dir_entries(trans, root, objectid,
 761                                 &btrfs_inode, ext2_fs, ext2_ino);
 762                 break;
 763         case S_IFLNK:
 764                 ret = ext2_create_symlink(trans, root, objectid,
 765                                 &btrfs_inode, ext2_fs, ext2_ino, ext2_inode);
 766                 break;
 767         default:
 768                 ret = 0;
 769                 break;
 770         }
 771         if (ret)
 772                 return ret;
 773
 774         if (convert_flags & CONVERT_FLAG_XATTR) {
 775                 ret = ext2_copy_extended_attrs(trans, root, objectid,
 776                                 &btrfs_inode, ext2_fs, ext2_ino);
 777                 if (ret)
 778                         return ret;
 779         }
 780         return btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
 781 }
 782
 783 static int ext2_is_special_inode(ext2_ino_t ino)
 784 {
 785         if (ino < EXT2_GOOD_OLD_FIRST_INO && ino != EXT2_ROOT_INO)
 786                 return 1;
 787         return 0;
 788 }
 789
 790 /*
 791  * scan ext2's inode bitmap and copy all used inodes.
 792  */
 793 static int ext2_copy_inodes(struct btrfs_convert_context *cctx,
 794                             struct btrfs_root *root,
 795                             u32 convert_flags, struct task_ctx *p)
 796 {
 797         ext2_filsys ext2_fs = cctx->fs_data;
 798         int ret;
 799         errcode_t err;
 800         ext2_inode_scan ext2_scan;
 801         struct ext2_inode ext2_inode;
 802         ext2_ino_t ext2_ino;
 803         u64 objectid;
 804         struct btrfs_trans_handle *trans;
 805
 806         trans = btrfs_start_transaction(root, 1);
 807         if (IS_ERR(trans))
 808                 return PTR_ERR(trans);
 809         err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan);
 810         if (err) {
 811                 fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err));
 812                 return -1;
 813         }
 814         while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino,
 815                                              &ext2_inode))) {
 816                 /* no more inodes */
 817                 if (ext2_ino == 0)
 818                         break;
 819                 if (ext2_is_special_inode(ext2_ino))
 820                         continue;
 821                 objectid = ext2_ino + INO_OFFSET;
 822                 ret = ext2_copy_single_inode(trans, root,
 823                                         objectid, ext2_fs, ext2_ino,
 824                                         &ext2_inode, convert_flags);
 825                 pthread_mutex_lock(&p->mutex);
 826                 p->cur_copy_inodes++;
 827                 pthread_mutex_unlock(&p->mutex);
 828                 if (ret)
 829                         return ret;
 830                 if (trans->blocks_used >= 4096) {
 831                         ret = btrfs_commit_transaction(trans, root);
 832                         BUG_ON(ret);
 833                         trans = btrfs_start_transaction(root, 1);
 834                         BUG_ON(IS_ERR(trans));
 835                 }
 836         }
 837         if (err) {
 838                 fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err));
 839                 return -1;
 840         }
 841         ret = btrfs_commit_transaction(trans, root);
 842         BUG_ON(ret);
 843         ext2fs_close_inode_scan(ext2_scan);
 844
 845         return ret;
 846 }
 847
 848 const struct btrfs_convert_operations ext2_convert_ops = {
 849         .name                   = "ext2",
 850         .open_fs                = ext2_open_fs,
 851         .read_used_space        = ext2_read_used_space,
 852         .copy_inodes            = ext2_copy_inodes,
 853         .close_fs               = ext2_close_fs,
 854         .check_state            = ext2_check_state,
 855 };
 856
 857 #endif  /* BTRFSCONVERT_EXT2 */