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