From 03c085861b8692cd6f7d3307cadaab7ee4654fdb Mon Sep 17 00:00:00 2001 From: David Sterba Date: Fri, 27 Jan 2017 16:56:37 +0100 Subject: [PATCH] btrfs-progs: convert: move ext2 conversion out of main.c Signed-off-by: David Sterba --- Makefile.in | 10 +- convert/main.c | 849 +---------------------------------------- convert/source-ext2.c | 870 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 877 insertions(+), 852 deletions(-) create mode 100644 convert/source-ext2.c diff --git a/Makefile.in b/Makefile.in index 18b80e0a..4d9603cc 100644 --- a/Makefile.in +++ b/Makefile.in @@ -404,15 +404,17 @@ btrfs-image.static: $(static_objects) image/main.static.o $(static_libbtrfs_obje $(Q)$(CC) $(STATIC_CFLAGS) -o $@ image/main.static.o $(static_objects) \ $(static_libbtrfs_objects) $(STATIC_LDFLAGS) $(STATIC_LIBS) -btrfs-convert: $(objects) $(libs_static) convert/main.o convert/common.o +btrfs-convert: $(objects) $(libs_static) convert/main.o convert/common.o convert/source-ext2.o @echo " [LD] $@" $(Q)$(CC) $(CFLAGS) -I$(TOPDIR)/convert -o btrfs-convert $(objects) \ - convert/main.o convert/common.o $(libs_static) \ + convert/main.o convert/common.o convert/source-ext2.o $(libs_static) \ $(LDFLAGS) $(btrfs_convert_libs) $(LIBS) -btrfs-convert.static: $(static_objects) convert/main.static.o convert/common.static.o $(static_libbtrfs_objects) +btrfs-convert.static: $(static_objects) convert/main.static.o convert/common.static.o \ + convert/source-ext2.static. o $(static_libbtrfs_objects) @echo " [LD] $@" - $(Q)$(CC) $(STATIC_CFLAGS) -o $@ convert/main.static.o convert/common.static.o $(static_objects) \ + $(Q)$(CC) $(STATIC_CFLAGS) -o $@ convert/main.static.o convert/common.static.o \ + convert/source-ext2.static.o $(static_objects) \ $(static_libbtrfs_objects) $(STATIC_LDFLAGS) $(btrfs_convert_libs) $(STATIC_LIBS) dir-test: $(objects) $(libs) dir-test.o diff --git a/convert/main.c b/convert/main.c index 5eaa2517..105c4c12 100644 --- a/convert/main.c +++ b/convert/main.c @@ -41,7 +41,6 @@ #include "mkfs/common.h" #include "convert/common.h" #include "convert/source-fs.h" -#include "convert/source-ext2.h" #include "fsfeatures.h" static void *print_copied_inodes(void *p) @@ -1392,853 +1391,7 @@ static int prepare_system_chunk_sb(struct btrfs_super_block *super) return 0; } -#if BTRFSCONVERT_EXT2 - -/* - * Open Ext2fs in readonly mode, read block allocation bitmap and - * inode bitmap into memory. - */ -static int ext2_open_fs(struct btrfs_convert_context *cctx, const char *name) -{ - errcode_t ret; - ext2_filsys ext2_fs; - ext2_ino_t ino; - u32 ro_feature; - - ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs); - if (ret) { - fprintf(stderr, "ext2fs_open: %s\n", error_message(ret)); - return -1; - } - /* - * We need to know exactly the used space, some RO compat flags like - * BIGALLOC will affect how used space is present. - * So we need manuall check any unsupported RO compat flags - */ - ro_feature = ext2_fs->super->s_feature_ro_compat; - if (ro_feature & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) { - error( -"unsupported RO features detected: %x, abort convert to avoid possible corruption", - ro_feature & ~EXT2_LIB_FEATURE_COMPAT_SUPP); - goto fail; - } - ret = ext2fs_read_inode_bitmap(ext2_fs); - if (ret) { - fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n", - error_message(ret)); - goto fail; - } - ret = ext2fs_read_block_bitmap(ext2_fs); - if (ret) { - fprintf(stderr, "ext2fs_read_block_bitmap: %s\n", - error_message(ret)); - goto fail; - } - /* - * search each block group for a free inode. this set up - * uninit block/inode bitmaps appropriately. - */ - ino = 1; - while (ino <= ext2_fs->super->s_inodes_count) { - ext2_ino_t foo; - ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo); - ino += EXT2_INODES_PER_GROUP(ext2_fs->super); - } - - if (!(ext2_fs->super->s_feature_incompat & - EXT2_FEATURE_INCOMPAT_FILETYPE)) { - error("filetype feature is missing"); - goto fail; - } - - cctx->fs_data = ext2_fs; - cctx->blocksize = ext2_fs->blocksize; - cctx->block_count = ext2_fs->super->s_blocks_count; - cctx->total_bytes = ext2_fs->blocksize * ext2_fs->super->s_blocks_count; - cctx->volume_name = strndup(ext2_fs->super->s_volume_name, 16); - cctx->first_data_block = ext2_fs->super->s_first_data_block; - cctx->inodes_count = ext2_fs->super->s_inodes_count; - cctx->free_inodes_count = ext2_fs->super->s_free_inodes_count; - return 0; -fail: - ext2fs_close(ext2_fs); - return -1; -} - -static int __ext2_add_one_block(ext2_filsys fs, char *bitmap, - unsigned long group_nr, struct cache_tree *used) -{ - unsigned long offset; - unsigned i; - int ret = 0; - - offset = fs->super->s_first_data_block; - offset /= EXT2FS_CLUSTER_RATIO(fs); - offset += group_nr * EXT2_CLUSTERS_PER_GROUP(fs->super); - for (i = 0; i < EXT2_CLUSTERS_PER_GROUP(fs->super); i++) { - if ((i + offset) >= ext2fs_blocks_count(fs->super)) - break; - - if (ext2fs_test_bit(i, bitmap)) { - u64 start; - - start = (i + offset) * EXT2FS_CLUSTER_RATIO(fs); - start *= fs->blocksize; - ret = add_merge_cache_extent(used, start, - fs->blocksize); - if (ret < 0) - break; - } - } - return ret; -} - -/* - * Read all used ext2 space into cctx->used cache tree - */ -static int ext2_read_used_space(struct btrfs_convert_context *cctx) -{ - ext2_filsys fs = (ext2_filsys)cctx->fs_data; - blk64_t blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block); - struct cache_tree *used_tree = &cctx->used; - char *block_bitmap = NULL; - unsigned long i; - int block_nbytes; - int ret = 0; - - block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8; - /* Shouldn't happen */ - BUG_ON(!fs->block_map); - - block_bitmap = malloc(block_nbytes); - if (!block_bitmap) - return -ENOMEM; - - for (i = 0; i < fs->group_desc_count; i++) { - ret = ext2fs_get_block_bitmap_range(fs->block_map, blk_itr, - block_nbytes * 8, block_bitmap); - if (ret) { - error("fail to get bitmap from ext2, %s", - strerror(-ret)); - break; - } - ret = __ext2_add_one_block(fs, block_bitmap, i, used_tree); - if (ret < 0) { - error("fail to build used space tree, %s", - strerror(-ret)); - break; - } - blk_itr += EXT2_CLUSTERS_PER_GROUP(fs->super); - } - - free(block_bitmap); - return ret; -} - -static void ext2_close_fs(struct btrfs_convert_context *cctx) -{ - if (cctx->volume_name) { - free(cctx->volume_name); - cctx->volume_name = NULL; - } - ext2fs_close(cctx->fs_data); -} - -static u8 ext2_filetype_conversion_table[EXT2_FT_MAX] = { - [EXT2_FT_UNKNOWN] = BTRFS_FT_UNKNOWN, - [EXT2_FT_REG_FILE] = BTRFS_FT_REG_FILE, - [EXT2_FT_DIR] = BTRFS_FT_DIR, - [EXT2_FT_CHRDEV] = BTRFS_FT_CHRDEV, - [EXT2_FT_BLKDEV] = BTRFS_FT_BLKDEV, - [EXT2_FT_FIFO] = BTRFS_FT_FIFO, - [EXT2_FT_SOCK] = BTRFS_FT_SOCK, - [EXT2_FT_SYMLINK] = BTRFS_FT_SYMLINK, -}; - -static int ext2_dir_iterate_proc(ext2_ino_t dir, int entry, - struct ext2_dir_entry *dirent, - int offset, int blocksize, - char *buf,void *priv_data) -{ - int ret; - int file_type; - u64 objectid; - char dotdot[] = ".."; - struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data; - int name_len; - - name_len = dirent->name_len & 0xFF; - - objectid = dirent->inode + INO_OFFSET; - if (!strncmp(dirent->name, dotdot, name_len)) { - if (name_len == 2) { - BUG_ON(idata->parent != 0); - idata->parent = objectid; - } - return 0; - } - if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO) - return 0; - - file_type = dirent->name_len >> 8; - BUG_ON(file_type > EXT2_FT_SYMLINK); - - ret = convert_insert_dirent(idata->trans, idata->root, dirent->name, - name_len, idata->objectid, objectid, - ext2_filetype_conversion_table[file_type], - idata->index_cnt, idata->inode); - if (ret < 0) { - idata->errcode = ret; - return BLOCK_ABORT; - } - - idata->index_cnt++; - return 0; -} - -static int ext2_create_dir_entries(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 objectid, - struct btrfs_inode_item *btrfs_inode, - ext2_filsys ext2_fs, ext2_ino_t ext2_ino) -{ - int ret; - errcode_t err; - struct dir_iterate_data data = { - .trans = trans, - .root = root, - .inode = btrfs_inode, - .objectid = objectid, - .index_cnt = 2, - .parent = 0, - .errcode = 0, - }; - - err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL, - ext2_dir_iterate_proc, &data); - if (err) - goto error; - ret = data.errcode; - if (ret == 0 && data.parent == objectid) { - ret = btrfs_insert_inode_ref(trans, root, "..", 2, - objectid, objectid, 0); - } - return ret; -error: - fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err)); - return -1; -} - -static int ext2_block_iterate_proc(ext2_filsys fs, blk_t *blocknr, - e2_blkcnt_t blockcnt, blk_t ref_block, - int ref_offset, void *priv_data) -{ - int ret; - struct blk_iterate_data *idata; - idata = (struct blk_iterate_data *)priv_data; - ret = block_iterate_proc(*blocknr, blockcnt, idata); - if (ret) { - idata->errcode = ret; - return BLOCK_ABORT; - } - return 0; -} - -/* - * traverse file's data blocks, record these data blocks as file extents. - */ -static int ext2_create_file_extents(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 objectid, - struct btrfs_inode_item *btrfs_inode, - ext2_filsys ext2_fs, ext2_ino_t ext2_ino, - int datacsum, int packing) -{ - int ret; - char *buffer = NULL; - errcode_t err; - u32 last_block; - u32 sectorsize = root->sectorsize; - u64 inode_size = btrfs_stack_inode_size(btrfs_inode); - struct blk_iterate_data data; - - init_blk_iterate_data(&data, trans, root, btrfs_inode, objectid, - datacsum); - - err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY, - NULL, ext2_block_iterate_proc, &data); - if (err) - goto error; - ret = data.errcode; - if (ret) - goto fail; - if (packing && data.first_block == 0 && data.num_blocks > 0 && - inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) { - u64 num_bytes = data.num_blocks * sectorsize; - u64 disk_bytenr = data.disk_block * sectorsize; - u64 nbytes; - - buffer = malloc(num_bytes); - if (!buffer) - return -ENOMEM; - ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer); - if (ret) - goto fail; - if (num_bytes > inode_size) - num_bytes = inode_size; - ret = btrfs_insert_inline_extent(trans, root, objectid, - 0, buffer, num_bytes); - if (ret) - goto fail; - nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes; - btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes); - } else if (data.num_blocks > 0) { - ret = record_file_blocks(&data, data.first_block, - data.disk_block, data.num_blocks); - if (ret) - goto fail; - } - data.first_block += data.num_blocks; - last_block = (inode_size + sectorsize - 1) / sectorsize; - if (last_block > data.first_block) { - ret = record_file_blocks(&data, data.first_block, 0, - last_block - data.first_block); - } -fail: - free(buffer); - return ret; -error: - fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err)); - return -1; -} - -static int ext2_create_symbol_link(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 objectid, - struct btrfs_inode_item *btrfs_inode, - ext2_filsys ext2_fs, ext2_ino_t ext2_ino, - struct ext2_inode *ext2_inode) -{ - int ret; - char *pathname; - u64 inode_size = btrfs_stack_inode_size(btrfs_inode); - if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) { - btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1); - ret = ext2_create_file_extents(trans, root, objectid, - btrfs_inode, ext2_fs, ext2_ino, 1, 1); - btrfs_set_stack_inode_size(btrfs_inode, inode_size); - return ret; - } - - pathname = (char *)&(ext2_inode->i_block[0]); - BUG_ON(pathname[inode_size] != 0); - ret = btrfs_insert_inline_extent(trans, root, objectid, 0, - pathname, inode_size + 1); - btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1); - return ret; -} - -/* - * Following xattr/acl related codes are based on codes in - * fs/ext3/xattr.c and fs/ext3/acl.c - */ -#define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr)) -#define EXT2_XATTR_BFIRST(ptr) \ - ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1)) -#define EXT2_XATTR_IHDR(inode) \ - ((struct ext2_ext_attr_header *) ((void *)(inode) + \ - EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize)) -#define EXT2_XATTR_IFIRST(inode) \ - ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \ - sizeof(EXT2_XATTR_IHDR(inode)->h_magic))) - -static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry, - const void *end) -{ - struct ext2_ext_attr_entry *next; - - while (!EXT2_EXT_IS_LAST_ENTRY(entry)) { - next = EXT2_EXT_ATTR_NEXT(entry); - if ((void *)next >= end) - return -EIO; - entry = next; - } - return 0; -} - -static int ext2_xattr_check_block(const char *buf, size_t size) -{ - int error; - struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf); - - if (header->h_magic != EXT2_EXT_ATTR_MAGIC || - header->h_blocks != 1) - return -EIO; - error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size); - return error; -} - -static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry, - size_t size) -{ - size_t value_size = entry->e_value_size; - - if (entry->e_value_block != 0 || value_size > size || - entry->e_value_offs + value_size > size) - return -EIO; - return 0; -} - -static inline int ext2_acl_count(size_t size) -{ - ssize_t s; - size -= sizeof(ext2_acl_header); - s = size - 4 * sizeof(ext2_acl_entry_short); - if (s < 0) { - if (size % sizeof(ext2_acl_entry_short)) - return -1; - return size / sizeof(ext2_acl_entry_short); - } else { - if (s % sizeof(ext2_acl_entry)) - return -1; - return s / sizeof(ext2_acl_entry) + 4; - } -} - -static inline size_t acl_ea_size(int count) -{ - return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry); -} - -static int ext2_acl_to_xattr(void *dst, const void *src, - size_t dst_size, size_t src_size) -{ - int i, count; - const void *end = src + src_size; - acl_ea_header *ext_acl = (acl_ea_header *)dst; - acl_ea_entry *dst_entry = ext_acl->a_entries; - ext2_acl_entry *src_entry; - - if (src_size < sizeof(ext2_acl_header)) - goto fail; - if (((ext2_acl_header *)src)->a_version != - cpu_to_le32(EXT2_ACL_VERSION)) - goto fail; - src += sizeof(ext2_acl_header); - count = ext2_acl_count(src_size); - if (count <= 0) - goto fail; - - BUG_ON(dst_size < acl_ea_size(count)); - ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION); - for (i = 0; i < count; i++, dst_entry++) { - src_entry = (ext2_acl_entry *)src; - if (src + sizeof(ext2_acl_entry_short) > end) - goto fail; - dst_entry->e_tag = src_entry->e_tag; - dst_entry->e_perm = src_entry->e_perm; - switch (le16_to_cpu(src_entry->e_tag)) { - case ACL_USER_OBJ: - case ACL_GROUP_OBJ: - case ACL_MASK: - case ACL_OTHER: - src += sizeof(ext2_acl_entry_short); - dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); - break; - case ACL_USER: - case ACL_GROUP: - src += sizeof(ext2_acl_entry); - if (src > end) - goto fail; - dst_entry->e_id = src_entry->e_id; - break; - default: - goto fail; - } - } - if (src != end) - goto fail; - return 0; -fail: - return -EINVAL; -} - -static char *xattr_prefix_table[] = { - [1] = "user.", - [2] = "system.posix_acl_access", - [3] = "system.posix_acl_default", - [4] = "trusted.", - [6] = "security.", -}; - -static int ext2_copy_single_xattr(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 objectid, - struct ext2_ext_attr_entry *entry, - const void *data, u32 datalen) -{ - int ret = 0; - int name_len; - int name_index; - void *databuf = NULL; - char namebuf[XATTR_NAME_MAX + 1]; - - name_index = entry->e_name_index; - if (name_index >= ARRAY_SIZE(xattr_prefix_table) || - xattr_prefix_table[name_index] == NULL) - return -EOPNOTSUPP; - name_len = strlen(xattr_prefix_table[name_index]) + - entry->e_name_len; - if (name_len >= sizeof(namebuf)) - return -ERANGE; - - if (name_index == 2 || name_index == 3) { - size_t bufsize = acl_ea_size(ext2_acl_count(datalen)); - databuf = malloc(bufsize); - if (!databuf) - return -ENOMEM; - ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen); - if (ret) - goto out; - data = databuf; - datalen = bufsize; - } - strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX); - strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len); - if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) - - sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) { - fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n", - objectid - INO_OFFSET, name_len, namebuf); - goto out; - } - ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len, - data, datalen, objectid); -out: - free(databuf); - return ret; -} - -static int ext2_copy_extended_attrs(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 objectid, - struct btrfs_inode_item *btrfs_inode, - ext2_filsys ext2_fs, ext2_ino_t ext2_ino) -{ - int ret = 0; - int inline_ea = 0; - errcode_t err; - u32 datalen; - u32 block_size = ext2_fs->blocksize; - u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super); - struct ext2_inode_large *ext2_inode; - struct ext2_ext_attr_entry *entry; - void *data; - char *buffer = NULL; - char inode_buf[EXT2_GOOD_OLD_INODE_SIZE]; - - if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) { - ext2_inode = (struct ext2_inode_large *)inode_buf; - } else { - ext2_inode = (struct ext2_inode_large *)malloc(inode_size); - if (!ext2_inode) - return -ENOMEM; - } - err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode, - inode_size); - if (err) { - fprintf(stderr, "ext2fs_read_inode_full: %s\n", - error_message(err)); - ret = -1; - goto out; - } - - if (ext2_ino > ext2_fs->super->s_first_ino && - inode_size > EXT2_GOOD_OLD_INODE_SIZE) { - if (EXT2_GOOD_OLD_INODE_SIZE + - ext2_inode->i_extra_isize > inode_size) { - ret = -EIO; - goto out; - } - if (ext2_inode->i_extra_isize != 0 && - EXT2_XATTR_IHDR(ext2_inode)->h_magic == - EXT2_EXT_ATTR_MAGIC) { - inline_ea = 1; - } - } - if (inline_ea) { - int total; - void *end = (void *)ext2_inode + inode_size; - entry = EXT2_XATTR_IFIRST(ext2_inode); - total = end - (void *)entry; - ret = ext2_xattr_check_names(entry, end); - if (ret) - goto out; - while (!EXT2_EXT_IS_LAST_ENTRY(entry)) { - ret = ext2_xattr_check_entry(entry, total); - if (ret) - goto out; - data = (void *)EXT2_XATTR_IFIRST(ext2_inode) + - entry->e_value_offs; - datalen = entry->e_value_size; - ret = ext2_copy_single_xattr(trans, root, objectid, - entry, data, datalen); - if (ret) - goto out; - entry = EXT2_EXT_ATTR_NEXT(entry); - } - } - - if (ext2_inode->i_file_acl == 0) - goto out; - - buffer = malloc(block_size); - if (!buffer) { - ret = -ENOMEM; - goto out; - } - err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer); - if (err) { - fprintf(stderr, "ext2fs_read_ext_attr: %s\n", - error_message(err)); - ret = -1; - goto out; - } - ret = ext2_xattr_check_block(buffer, block_size); - if (ret) - goto out; - - entry = EXT2_XATTR_BFIRST(buffer); - while (!EXT2_EXT_IS_LAST_ENTRY(entry)) { - ret = ext2_xattr_check_entry(entry, block_size); - if (ret) - goto out; - data = buffer + entry->e_value_offs; - datalen = entry->e_value_size; - ret = ext2_copy_single_xattr(trans, root, objectid, - entry, data, datalen); - if (ret) - goto out; - entry = EXT2_EXT_ATTR_NEXT(entry); - } -out: - free(buffer); - if ((void *)ext2_inode != inode_buf) - free(ext2_inode); - return ret; -} -#define MINORBITS 20 -#define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi)) - -static inline dev_t old_decode_dev(u16 val) -{ - return MKDEV((val >> 8) & 255, val & 255); -} - -static inline dev_t new_decode_dev(u32 dev) -{ - unsigned major = (dev & 0xfff00) >> 8; - unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); - return MKDEV(major, minor); -} - -static void ext2_copy_inode_item(struct btrfs_inode_item *dst, - struct ext2_inode *src, u32 blocksize) -{ - btrfs_set_stack_inode_generation(dst, 1); - btrfs_set_stack_inode_sequence(dst, 0); - btrfs_set_stack_inode_transid(dst, 1); - btrfs_set_stack_inode_size(dst, src->i_size); - btrfs_set_stack_inode_nbytes(dst, 0); - btrfs_set_stack_inode_block_group(dst, 0); - btrfs_set_stack_inode_nlink(dst, src->i_links_count); - btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16)); - btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16)); - btrfs_set_stack_inode_mode(dst, src->i_mode); - btrfs_set_stack_inode_rdev(dst, 0); - btrfs_set_stack_inode_flags(dst, 0); - btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime); - btrfs_set_stack_timespec_nsec(&dst->atime, 0); - btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime); - btrfs_set_stack_timespec_nsec(&dst->ctime, 0); - btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime); - btrfs_set_stack_timespec_nsec(&dst->mtime, 0); - btrfs_set_stack_timespec_sec(&dst->otime, 0); - btrfs_set_stack_timespec_nsec(&dst->otime, 0); - - if (S_ISDIR(src->i_mode)) { - btrfs_set_stack_inode_size(dst, 0); - btrfs_set_stack_inode_nlink(dst, 1); - } - if (S_ISREG(src->i_mode)) { - btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 | - (u64)src->i_size); - } - if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) && - !S_ISLNK(src->i_mode)) { - if (src->i_block[0]) { - btrfs_set_stack_inode_rdev(dst, - old_decode_dev(src->i_block[0])); - } else { - btrfs_set_stack_inode_rdev(dst, - new_decode_dev(src->i_block[1])); - } - } - memset(&dst->reserved, 0, sizeof(dst->reserved)); -} -static int ext2_check_state(struct btrfs_convert_context *cctx) -{ - ext2_filsys fs = cctx->fs_data; - - if (!(fs->super->s_state & EXT2_VALID_FS)) - return 1; - else if (fs->super->s_state & EXT2_ERROR_FS) - return 1; - else - return 0; -} - -/* EXT2_*_FL to BTRFS_INODE_FLAG_* stringification helper */ -#define COPY_ONE_EXT2_FLAG(flags, ext2_inode, name) ({ \ - if (ext2_inode->i_flags & EXT2_##name##_FL) \ - flags |= BTRFS_INODE_##name; \ -}) - -/* - * Convert EXT2_*_FL to corresponding BTRFS_INODE_* flags - * - * Only a subset of EXT_*_FL is supported in btrfs. - */ -static void ext2_convert_inode_flags(struct btrfs_inode_item *dst, - struct ext2_inode *src) -{ - u64 flags = 0; - - COPY_ONE_EXT2_FLAG(flags, src, APPEND); - COPY_ONE_EXT2_FLAG(flags, src, SYNC); - COPY_ONE_EXT2_FLAG(flags, src, IMMUTABLE); - COPY_ONE_EXT2_FLAG(flags, src, NODUMP); - COPY_ONE_EXT2_FLAG(flags, src, NOATIME); - COPY_ONE_EXT2_FLAG(flags, src, DIRSYNC); - btrfs_set_stack_inode_flags(dst, flags); -} - -/* - * copy a single inode. do all the required works, such as cloning - * inode item, creating file extents and creating directory entries. - */ -static int ext2_copy_single_inode(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 objectid, - ext2_filsys ext2_fs, ext2_ino_t ext2_ino, - struct ext2_inode *ext2_inode, - int datacsum, int packing, int noxattr) -{ - int ret; - struct btrfs_inode_item btrfs_inode; - - if (ext2_inode->i_links_count == 0) - return 0; - - ext2_copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize); - if (!datacsum && S_ISREG(ext2_inode->i_mode)) { - u32 flags = btrfs_stack_inode_flags(&btrfs_inode) | - BTRFS_INODE_NODATASUM; - btrfs_set_stack_inode_flags(&btrfs_inode, flags); - } - ext2_convert_inode_flags(&btrfs_inode, ext2_inode); - - switch (ext2_inode->i_mode & S_IFMT) { - case S_IFREG: - ret = ext2_create_file_extents(trans, root, objectid, - &btrfs_inode, ext2_fs, ext2_ino, datacsum, packing); - break; - case S_IFDIR: - ret = ext2_create_dir_entries(trans, root, objectid, - &btrfs_inode, ext2_fs, ext2_ino); - break; - case S_IFLNK: - ret = ext2_create_symbol_link(trans, root, objectid, - &btrfs_inode, ext2_fs, ext2_ino, ext2_inode); - break; - default: - ret = 0; - break; - } - if (ret) - return ret; - - if (!noxattr) { - ret = ext2_copy_extended_attrs(trans, root, objectid, - &btrfs_inode, ext2_fs, ext2_ino); - if (ret) - return ret; - } - return btrfs_insert_inode(trans, root, objectid, &btrfs_inode); -} - -/* - * scan ext2's inode bitmap and copy all used inodes. - */ -static int ext2_copy_inodes(struct btrfs_convert_context *cctx, - struct btrfs_root *root, - int datacsum, int packing, int noxattr, struct task_ctx *p) -{ - ext2_filsys ext2_fs = cctx->fs_data; - int ret; - errcode_t err; - ext2_inode_scan ext2_scan; - struct ext2_inode ext2_inode; - ext2_ino_t ext2_ino; - u64 objectid; - struct btrfs_trans_handle *trans; - - trans = btrfs_start_transaction(root, 1); - if (!trans) - return -ENOMEM; - err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan); - if (err) { - fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err)); - return -1; - } - while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino, - &ext2_inode))) { - /* no more inodes */ - if (ext2_ino == 0) - break; - /* skip special inode in ext2fs */ - if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO && - ext2_ino != EXT2_ROOT_INO) - continue; - objectid = ext2_ino + INO_OFFSET; - ret = ext2_copy_single_inode(trans, root, - objectid, ext2_fs, ext2_ino, - &ext2_inode, datacsum, packing, - noxattr); - p->cur_copy_inodes++; - if (ret) - return ret; - if (trans->blocks_used >= 4096) { - ret = btrfs_commit_transaction(trans, root); - BUG_ON(ret); - trans = btrfs_start_transaction(root, 1); - BUG_ON(!trans); - } - } - if (err) { - fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err)); - return -1; - } - ret = btrfs_commit_transaction(trans, root); - BUG_ON(ret); - ext2fs_close_inode_scan(ext2_scan); - - return ret; -} - -static const struct btrfs_convert_operations ext2_convert_ops = { - .name = "ext2", - .open_fs = ext2_open_fs, - .read_used_space = ext2_read_used_space, - .copy_inodes = ext2_copy_inodes, - .close_fs = ext2_close_fs, - .check_state = ext2_check_state, -}; - -#endif +const struct btrfs_convert_operations ext2_convert_ops; static const struct btrfs_convert_operations *convert_operations[] = { #if BTRFSCONVERT_EXT2 diff --git a/convert/source-ext2.c b/convert/source-ext2.c new file mode 100644 index 00000000..f286d074 --- /dev/null +++ b/convert/source-ext2.c @@ -0,0 +1,870 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#if BTRFSCONVERT_EXT2 + +#include "kerncompat.h" +#include "disk-io.h" +#include "transaction.h" +#include "utils.h" +#include "convert/common.h" +#include "convert/source-ext2.h" + +/* + * Open Ext2fs in readonly mode, read block allocation bitmap and + * inode bitmap into memory. + */ +static int ext2_open_fs(struct btrfs_convert_context *cctx, const char *name) +{ + errcode_t ret; + ext2_filsys ext2_fs; + ext2_ino_t ino; + u32 ro_feature; + + ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs); + if (ret) { + fprintf(stderr, "ext2fs_open: %s\n", error_message(ret)); + return -1; + } + /* + * We need to know exactly the used space, some RO compat flags like + * BIGALLOC will affect how used space is present. + * So we need manuall check any unsupported RO compat flags + */ + ro_feature = ext2_fs->super->s_feature_ro_compat; + if (ro_feature & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) { + error( +"unsupported RO features detected: %x, abort convert to avoid possible corruption", + ro_feature & ~EXT2_LIB_FEATURE_COMPAT_SUPP); + goto fail; + } + ret = ext2fs_read_inode_bitmap(ext2_fs); + if (ret) { + fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n", + error_message(ret)); + goto fail; + } + ret = ext2fs_read_block_bitmap(ext2_fs); + if (ret) { + fprintf(stderr, "ext2fs_read_block_bitmap: %s\n", + error_message(ret)); + goto fail; + } + /* + * search each block group for a free inode. this set up + * uninit block/inode bitmaps appropriately. + */ + ino = 1; + while (ino <= ext2_fs->super->s_inodes_count) { + ext2_ino_t foo; + ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo); + ino += EXT2_INODES_PER_GROUP(ext2_fs->super); + } + + if (!(ext2_fs->super->s_feature_incompat & + EXT2_FEATURE_INCOMPAT_FILETYPE)) { + error("filetype feature is missing"); + goto fail; + } + + cctx->fs_data = ext2_fs; + cctx->blocksize = ext2_fs->blocksize; + cctx->block_count = ext2_fs->super->s_blocks_count; + cctx->total_bytes = ext2_fs->blocksize * ext2_fs->super->s_blocks_count; + cctx->volume_name = strndup(ext2_fs->super->s_volume_name, 16); + cctx->first_data_block = ext2_fs->super->s_first_data_block; + cctx->inodes_count = ext2_fs->super->s_inodes_count; + cctx->free_inodes_count = ext2_fs->super->s_free_inodes_count; + return 0; +fail: + ext2fs_close(ext2_fs); + return -1; +} + +static int __ext2_add_one_block(ext2_filsys fs, char *bitmap, + unsigned long group_nr, struct cache_tree *used) +{ + unsigned long offset; + unsigned i; + int ret = 0; + + offset = fs->super->s_first_data_block; + offset /= EXT2FS_CLUSTER_RATIO(fs); + offset += group_nr * EXT2_CLUSTERS_PER_GROUP(fs->super); + for (i = 0; i < EXT2_CLUSTERS_PER_GROUP(fs->super); i++) { + if ((i + offset) >= ext2fs_blocks_count(fs->super)) + break; + + if (ext2fs_test_bit(i, bitmap)) { + u64 start; + + start = (i + offset) * EXT2FS_CLUSTER_RATIO(fs); + start *= fs->blocksize; + ret = add_merge_cache_extent(used, start, + fs->blocksize); + if (ret < 0) + break; + } + } + return ret; +} + +/* + * Read all used ext2 space into cctx->used cache tree + */ +static int ext2_read_used_space(struct btrfs_convert_context *cctx) +{ + ext2_filsys fs = (ext2_filsys)cctx->fs_data; + blk64_t blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block); + struct cache_tree *used_tree = &cctx->used; + char *block_bitmap = NULL; + unsigned long i; + int block_nbytes; + int ret = 0; + + block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8; + /* Shouldn't happen */ + BUG_ON(!fs->block_map); + + block_bitmap = malloc(block_nbytes); + if (!block_bitmap) + return -ENOMEM; + + for (i = 0; i < fs->group_desc_count; i++) { + ret = ext2fs_get_block_bitmap_range(fs->block_map, blk_itr, + block_nbytes * 8, block_bitmap); + if (ret) { + error("fail to get bitmap from ext2, %s", + strerror(-ret)); + break; + } + ret = __ext2_add_one_block(fs, block_bitmap, i, used_tree); + if (ret < 0) { + error("fail to build used space tree, %s", + strerror(-ret)); + break; + } + blk_itr += EXT2_CLUSTERS_PER_GROUP(fs->super); + } + + free(block_bitmap); + return ret; +} + +static void ext2_close_fs(struct btrfs_convert_context *cctx) +{ + if (cctx->volume_name) { + free(cctx->volume_name); + cctx->volume_name = NULL; + } + ext2fs_close(cctx->fs_data); +} + +static u8 ext2_filetype_conversion_table[EXT2_FT_MAX] = { + [EXT2_FT_UNKNOWN] = BTRFS_FT_UNKNOWN, + [EXT2_FT_REG_FILE] = BTRFS_FT_REG_FILE, + [EXT2_FT_DIR] = BTRFS_FT_DIR, + [EXT2_FT_CHRDEV] = BTRFS_FT_CHRDEV, + [EXT2_FT_BLKDEV] = BTRFS_FT_BLKDEV, + [EXT2_FT_FIFO] = BTRFS_FT_FIFO, + [EXT2_FT_SOCK] = BTRFS_FT_SOCK, + [EXT2_FT_SYMLINK] = BTRFS_FT_SYMLINK, +}; + +static int ext2_dir_iterate_proc(ext2_ino_t dir, int entry, + struct ext2_dir_entry *dirent, + int offset, int blocksize, + char *buf,void *priv_data) +{ + int ret; + int file_type; + u64 objectid; + char dotdot[] = ".."; + struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data; + int name_len; + + name_len = dirent->name_len & 0xFF; + + objectid = dirent->inode + INO_OFFSET; + if (!strncmp(dirent->name, dotdot, name_len)) { + if (name_len == 2) { + BUG_ON(idata->parent != 0); + idata->parent = objectid; + } + return 0; + } + if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO) + return 0; + + file_type = dirent->name_len >> 8; + BUG_ON(file_type > EXT2_FT_SYMLINK); + + ret = convert_insert_dirent(idata->trans, idata->root, dirent->name, + name_len, idata->objectid, objectid, + ext2_filetype_conversion_table[file_type], + idata->index_cnt, idata->inode); + if (ret < 0) { + idata->errcode = ret; + return BLOCK_ABORT; + } + + idata->index_cnt++; + return 0; +} + +static int ext2_create_dir_entries(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 objectid, + struct btrfs_inode_item *btrfs_inode, + ext2_filsys ext2_fs, ext2_ino_t ext2_ino) +{ + int ret; + errcode_t err; + struct dir_iterate_data data = { + .trans = trans, + .root = root, + .inode = btrfs_inode, + .objectid = objectid, + .index_cnt = 2, + .parent = 0, + .errcode = 0, + }; + + err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL, + ext2_dir_iterate_proc, &data); + if (err) + goto error; + ret = data.errcode; + if (ret == 0 && data.parent == objectid) { + ret = btrfs_insert_inode_ref(trans, root, "..", 2, + objectid, objectid, 0); + } + return ret; +error: + fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err)); + return -1; +} + +static int ext2_block_iterate_proc(ext2_filsys fs, blk_t *blocknr, + e2_blkcnt_t blockcnt, blk_t ref_block, + int ref_offset, void *priv_data) +{ + int ret; + struct blk_iterate_data *idata; + idata = (struct blk_iterate_data *)priv_data; + ret = block_iterate_proc(*blocknr, blockcnt, idata); + if (ret) { + idata->errcode = ret; + return BLOCK_ABORT; + } + return 0; +} + +/* + * traverse file's data blocks, record these data blocks as file extents. + */ +static int ext2_create_file_extents(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 objectid, + struct btrfs_inode_item *btrfs_inode, + ext2_filsys ext2_fs, ext2_ino_t ext2_ino, + int datacsum, int packing) +{ + int ret; + char *buffer = NULL; + errcode_t err; + u32 last_block; + u32 sectorsize = root->sectorsize; + u64 inode_size = btrfs_stack_inode_size(btrfs_inode); + struct blk_iterate_data data; + + init_blk_iterate_data(&data, trans, root, btrfs_inode, objectid, + datacsum); + + err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY, + NULL, ext2_block_iterate_proc, &data); + if (err) + goto error; + ret = data.errcode; + if (ret) + goto fail; + if (packing && data.first_block == 0 && data.num_blocks > 0 && + inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) { + u64 num_bytes = data.num_blocks * sectorsize; + u64 disk_bytenr = data.disk_block * sectorsize; + u64 nbytes; + + buffer = malloc(num_bytes); + if (!buffer) + return -ENOMEM; + ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer); + if (ret) + goto fail; + if (num_bytes > inode_size) + num_bytes = inode_size; + ret = btrfs_insert_inline_extent(trans, root, objectid, + 0, buffer, num_bytes); + if (ret) + goto fail; + nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes; + btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes); + } else if (data.num_blocks > 0) { + ret = record_file_blocks(&data, data.first_block, + data.disk_block, data.num_blocks); + if (ret) + goto fail; + } + data.first_block += data.num_blocks; + last_block = (inode_size + sectorsize - 1) / sectorsize; + if (last_block > data.first_block) { + ret = record_file_blocks(&data, data.first_block, 0, + last_block - data.first_block); + } +fail: + free(buffer); + return ret; +error: + fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err)); + return -1; +} + +static int ext2_create_symbol_link(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 objectid, + struct btrfs_inode_item *btrfs_inode, + ext2_filsys ext2_fs, ext2_ino_t ext2_ino, + struct ext2_inode *ext2_inode) +{ + int ret; + char *pathname; + u64 inode_size = btrfs_stack_inode_size(btrfs_inode); + if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) { + btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1); + ret = ext2_create_file_extents(trans, root, objectid, + btrfs_inode, ext2_fs, ext2_ino, 1, 1); + btrfs_set_stack_inode_size(btrfs_inode, inode_size); + return ret; + } + + pathname = (char *)&(ext2_inode->i_block[0]); + BUG_ON(pathname[inode_size] != 0); + ret = btrfs_insert_inline_extent(trans, root, objectid, 0, + pathname, inode_size + 1); + btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1); + return ret; +} + +/* + * Following xattr/acl related codes are based on codes in + * fs/ext3/xattr.c and fs/ext3/acl.c + */ +#define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr)) +#define EXT2_XATTR_BFIRST(ptr) \ + ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1)) +#define EXT2_XATTR_IHDR(inode) \ + ((struct ext2_ext_attr_header *) ((void *)(inode) + \ + EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize)) +#define EXT2_XATTR_IFIRST(inode) \ + ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \ + sizeof(EXT2_XATTR_IHDR(inode)->h_magic))) + +static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry, + const void *end) +{ + struct ext2_ext_attr_entry *next; + + while (!EXT2_EXT_IS_LAST_ENTRY(entry)) { + next = EXT2_EXT_ATTR_NEXT(entry); + if ((void *)next >= end) + return -EIO; + entry = next; + } + return 0; +} + +static int ext2_xattr_check_block(const char *buf, size_t size) +{ + int error; + struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf); + + if (header->h_magic != EXT2_EXT_ATTR_MAGIC || + header->h_blocks != 1) + return -EIO; + error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size); + return error; +} + +static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry, + size_t size) +{ + size_t value_size = entry->e_value_size; + + if (entry->e_value_block != 0 || value_size > size || + entry->e_value_offs + value_size > size) + return -EIO; + return 0; +} + +static inline int ext2_acl_count(size_t size) +{ + ssize_t s; + size -= sizeof(ext2_acl_header); + s = size - 4 * sizeof(ext2_acl_entry_short); + if (s < 0) { + if (size % sizeof(ext2_acl_entry_short)) + return -1; + return size / sizeof(ext2_acl_entry_short); + } else { + if (s % sizeof(ext2_acl_entry)) + return -1; + return s / sizeof(ext2_acl_entry) + 4; + } +} + +static inline size_t acl_ea_size(int count) +{ + return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry); +} + +static int ext2_acl_to_xattr(void *dst, const void *src, + size_t dst_size, size_t src_size) +{ + int i, count; + const void *end = src + src_size; + acl_ea_header *ext_acl = (acl_ea_header *)dst; + acl_ea_entry *dst_entry = ext_acl->a_entries; + ext2_acl_entry *src_entry; + + if (src_size < sizeof(ext2_acl_header)) + goto fail; + if (((ext2_acl_header *)src)->a_version != + cpu_to_le32(EXT2_ACL_VERSION)) + goto fail; + src += sizeof(ext2_acl_header); + count = ext2_acl_count(src_size); + if (count <= 0) + goto fail; + + BUG_ON(dst_size < acl_ea_size(count)); + ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION); + for (i = 0; i < count; i++, dst_entry++) { + src_entry = (ext2_acl_entry *)src; + if (src + sizeof(ext2_acl_entry_short) > end) + goto fail; + dst_entry->e_tag = src_entry->e_tag; + dst_entry->e_perm = src_entry->e_perm; + switch (le16_to_cpu(src_entry->e_tag)) { + case ACL_USER_OBJ: + case ACL_GROUP_OBJ: + case ACL_MASK: + case ACL_OTHER: + src += sizeof(ext2_acl_entry_short); + dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); + break; + case ACL_USER: + case ACL_GROUP: + src += sizeof(ext2_acl_entry); + if (src > end) + goto fail; + dst_entry->e_id = src_entry->e_id; + break; + default: + goto fail; + } + } + if (src != end) + goto fail; + return 0; +fail: + return -EINVAL; +} + +static char *xattr_prefix_table[] = { + [1] = "user.", + [2] = "system.posix_acl_access", + [3] = "system.posix_acl_default", + [4] = "trusted.", + [6] = "security.", +}; + +static int ext2_copy_single_xattr(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 objectid, + struct ext2_ext_attr_entry *entry, + const void *data, u32 datalen) +{ + int ret = 0; + int name_len; + int name_index; + void *databuf = NULL; + char namebuf[XATTR_NAME_MAX + 1]; + + name_index = entry->e_name_index; + if (name_index >= ARRAY_SIZE(xattr_prefix_table) || + xattr_prefix_table[name_index] == NULL) + return -EOPNOTSUPP; + name_len = strlen(xattr_prefix_table[name_index]) + + entry->e_name_len; + if (name_len >= sizeof(namebuf)) + return -ERANGE; + + if (name_index == 2 || name_index == 3) { + size_t bufsize = acl_ea_size(ext2_acl_count(datalen)); + databuf = malloc(bufsize); + if (!databuf) + return -ENOMEM; + ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen); + if (ret) + goto out; + data = databuf; + datalen = bufsize; + } + strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX); + strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len); + if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) - + sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) { + fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n", + objectid - INO_OFFSET, name_len, namebuf); + goto out; + } + ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len, + data, datalen, objectid); +out: + free(databuf); + return ret; +} + +static int ext2_copy_extended_attrs(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 objectid, + struct btrfs_inode_item *btrfs_inode, + ext2_filsys ext2_fs, ext2_ino_t ext2_ino) +{ + int ret = 0; + int inline_ea = 0; + errcode_t err; + u32 datalen; + u32 block_size = ext2_fs->blocksize; + u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super); + struct ext2_inode_large *ext2_inode; + struct ext2_ext_attr_entry *entry; + void *data; + char *buffer = NULL; + char inode_buf[EXT2_GOOD_OLD_INODE_SIZE]; + + if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) { + ext2_inode = (struct ext2_inode_large *)inode_buf; + } else { + ext2_inode = (struct ext2_inode_large *)malloc(inode_size); + if (!ext2_inode) + return -ENOMEM; + } + err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode, + inode_size); + if (err) { + fprintf(stderr, "ext2fs_read_inode_full: %s\n", + error_message(err)); + ret = -1; + goto out; + } + + if (ext2_ino > ext2_fs->super->s_first_ino && + inode_size > EXT2_GOOD_OLD_INODE_SIZE) { + if (EXT2_GOOD_OLD_INODE_SIZE + + ext2_inode->i_extra_isize > inode_size) { + ret = -EIO; + goto out; + } + if (ext2_inode->i_extra_isize != 0 && + EXT2_XATTR_IHDR(ext2_inode)->h_magic == + EXT2_EXT_ATTR_MAGIC) { + inline_ea = 1; + } + } + if (inline_ea) { + int total; + void *end = (void *)ext2_inode + inode_size; + entry = EXT2_XATTR_IFIRST(ext2_inode); + total = end - (void *)entry; + ret = ext2_xattr_check_names(entry, end); + if (ret) + goto out; + while (!EXT2_EXT_IS_LAST_ENTRY(entry)) { + ret = ext2_xattr_check_entry(entry, total); + if (ret) + goto out; + data = (void *)EXT2_XATTR_IFIRST(ext2_inode) + + entry->e_value_offs; + datalen = entry->e_value_size; + ret = ext2_copy_single_xattr(trans, root, objectid, + entry, data, datalen); + if (ret) + goto out; + entry = EXT2_EXT_ATTR_NEXT(entry); + } + } + + if (ext2_inode->i_file_acl == 0) + goto out; + + buffer = malloc(block_size); + if (!buffer) { + ret = -ENOMEM; + goto out; + } + err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer); + if (err) { + fprintf(stderr, "ext2fs_read_ext_attr: %s\n", + error_message(err)); + ret = -1; + goto out; + } + ret = ext2_xattr_check_block(buffer, block_size); + if (ret) + goto out; + + entry = EXT2_XATTR_BFIRST(buffer); + while (!EXT2_EXT_IS_LAST_ENTRY(entry)) { + ret = ext2_xattr_check_entry(entry, block_size); + if (ret) + goto out; + data = buffer + entry->e_value_offs; + datalen = entry->e_value_size; + ret = ext2_copy_single_xattr(trans, root, objectid, + entry, data, datalen); + if (ret) + goto out; + entry = EXT2_EXT_ATTR_NEXT(entry); + } +out: + free(buffer); + if ((void *)ext2_inode != inode_buf) + free(ext2_inode); + return ret; +} +#define MINORBITS 20 +#define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi)) + +static inline dev_t old_decode_dev(u16 val) +{ + return MKDEV((val >> 8) & 255, val & 255); +} + +static inline dev_t new_decode_dev(u32 dev) +{ + unsigned major = (dev & 0xfff00) >> 8; + unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); + return MKDEV(major, minor); +} + +static void ext2_copy_inode_item(struct btrfs_inode_item *dst, + struct ext2_inode *src, u32 blocksize) +{ + btrfs_set_stack_inode_generation(dst, 1); + btrfs_set_stack_inode_sequence(dst, 0); + btrfs_set_stack_inode_transid(dst, 1); + btrfs_set_stack_inode_size(dst, src->i_size); + btrfs_set_stack_inode_nbytes(dst, 0); + btrfs_set_stack_inode_block_group(dst, 0); + btrfs_set_stack_inode_nlink(dst, src->i_links_count); + btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16)); + btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16)); + btrfs_set_stack_inode_mode(dst, src->i_mode); + btrfs_set_stack_inode_rdev(dst, 0); + btrfs_set_stack_inode_flags(dst, 0); + btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime); + btrfs_set_stack_timespec_nsec(&dst->atime, 0); + btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime); + btrfs_set_stack_timespec_nsec(&dst->ctime, 0); + btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime); + btrfs_set_stack_timespec_nsec(&dst->mtime, 0); + btrfs_set_stack_timespec_sec(&dst->otime, 0); + btrfs_set_stack_timespec_nsec(&dst->otime, 0); + + if (S_ISDIR(src->i_mode)) { + btrfs_set_stack_inode_size(dst, 0); + btrfs_set_stack_inode_nlink(dst, 1); + } + if (S_ISREG(src->i_mode)) { + btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 | + (u64)src->i_size); + } + if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) && + !S_ISLNK(src->i_mode)) { + if (src->i_block[0]) { + btrfs_set_stack_inode_rdev(dst, + old_decode_dev(src->i_block[0])); + } else { + btrfs_set_stack_inode_rdev(dst, + new_decode_dev(src->i_block[1])); + } + } + memset(&dst->reserved, 0, sizeof(dst->reserved)); +} +static int ext2_check_state(struct btrfs_convert_context *cctx) +{ + ext2_filsys fs = cctx->fs_data; + + if (!(fs->super->s_state & EXT2_VALID_FS)) + return 1; + else if (fs->super->s_state & EXT2_ERROR_FS) + return 1; + else + return 0; +} + +/* EXT2_*_FL to BTRFS_INODE_FLAG_* stringification helper */ +#define COPY_ONE_EXT2_FLAG(flags, ext2_inode, name) ({ \ + if (ext2_inode->i_flags & EXT2_##name##_FL) \ + flags |= BTRFS_INODE_##name; \ +}) + +/* + * Convert EXT2_*_FL to corresponding BTRFS_INODE_* flags + * + * Only a subset of EXT_*_FL is supported in btrfs. + */ +static void ext2_convert_inode_flags(struct btrfs_inode_item *dst, + struct ext2_inode *src) +{ + u64 flags = 0; + + COPY_ONE_EXT2_FLAG(flags, src, APPEND); + COPY_ONE_EXT2_FLAG(flags, src, SYNC); + COPY_ONE_EXT2_FLAG(flags, src, IMMUTABLE); + COPY_ONE_EXT2_FLAG(flags, src, NODUMP); + COPY_ONE_EXT2_FLAG(flags, src, NOATIME); + COPY_ONE_EXT2_FLAG(flags, src, DIRSYNC); + btrfs_set_stack_inode_flags(dst, flags); +} + +/* + * copy a single inode. do all the required works, such as cloning + * inode item, creating file extents and creating directory entries. + */ +static int ext2_copy_single_inode(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 objectid, + ext2_filsys ext2_fs, ext2_ino_t ext2_ino, + struct ext2_inode *ext2_inode, + int datacsum, int packing, int noxattr) +{ + int ret; + struct btrfs_inode_item btrfs_inode; + + if (ext2_inode->i_links_count == 0) + return 0; + + ext2_copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize); + if (!datacsum && S_ISREG(ext2_inode->i_mode)) { + u32 flags = btrfs_stack_inode_flags(&btrfs_inode) | + BTRFS_INODE_NODATASUM; + btrfs_set_stack_inode_flags(&btrfs_inode, flags); + } + ext2_convert_inode_flags(&btrfs_inode, ext2_inode); + + switch (ext2_inode->i_mode & S_IFMT) { + case S_IFREG: + ret = ext2_create_file_extents(trans, root, objectid, + &btrfs_inode, ext2_fs, ext2_ino, datacsum, packing); + break; + case S_IFDIR: + ret = ext2_create_dir_entries(trans, root, objectid, + &btrfs_inode, ext2_fs, ext2_ino); + break; + case S_IFLNK: + ret = ext2_create_symbol_link(trans, root, objectid, + &btrfs_inode, ext2_fs, ext2_ino, ext2_inode); + break; + default: + ret = 0; + break; + } + if (ret) + return ret; + + if (!noxattr) { + ret = ext2_copy_extended_attrs(trans, root, objectid, + &btrfs_inode, ext2_fs, ext2_ino); + if (ret) + return ret; + } + return btrfs_insert_inode(trans, root, objectid, &btrfs_inode); +} + +/* + * scan ext2's inode bitmap and copy all used inodes. + */ +static int ext2_copy_inodes(struct btrfs_convert_context *cctx, + struct btrfs_root *root, + int datacsum, int packing, int noxattr, struct task_ctx *p) +{ + ext2_filsys ext2_fs = cctx->fs_data; + int ret; + errcode_t err; + ext2_inode_scan ext2_scan; + struct ext2_inode ext2_inode; + ext2_ino_t ext2_ino; + u64 objectid; + struct btrfs_trans_handle *trans; + + trans = btrfs_start_transaction(root, 1); + if (!trans) + return -ENOMEM; + err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan); + if (err) { + fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err)); + return -1; + } + while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino, + &ext2_inode))) { + /* no more inodes */ + if (ext2_ino == 0) + break; + /* skip special inode in ext2fs */ + if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO && + ext2_ino != EXT2_ROOT_INO) + continue; + objectid = ext2_ino + INO_OFFSET; + ret = ext2_copy_single_inode(trans, root, + objectid, ext2_fs, ext2_ino, + &ext2_inode, datacsum, packing, + noxattr); + p->cur_copy_inodes++; + if (ret) + return ret; + if (trans->blocks_used >= 4096) { + ret = btrfs_commit_transaction(trans, root); + BUG_ON(ret); + trans = btrfs_start_transaction(root, 1); + BUG_ON(!trans); + } + } + if (err) { + fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err)); + return -1; + } + ret = btrfs_commit_transaction(trans, root); + BUG_ON(ret); + ext2fs_close_inode_scan(ext2_scan); + + return ret; +} + +const struct btrfs_convert_operations ext2_convert_ops = { + .name = "ext2", + .open_fs = ext2_open_fs, + .read_used_space = ext2_read_used_space, + .copy_inodes = ext2_copy_inodes, + .close_fs = ext2_close_fs, + .check_state = ext2_check_state, +}; + +#endif /* BTRFSCONVERT_EXT2 */