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convert.c
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/*
* Copyright (C) 2007 Oracle. All rights reserved.
*
* 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.
*/
#define _XOPEN_SOURCE 600
#define _GNU_SOURCE 1
#include "kerncompat.h"
#ifndef __CHECKER__
#include <sys/ioctl.h>
#include <sys/mount.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/acl.h>
#include <fcntl.h>
#include <unistd.h>
#include <uuid/uuid.h>
#include <linux/fs.h>
#include "ctree.h"
#include "disk-io.h"
#include "volumes.h"
#include "transaction.h"
#include "crc32c.h"
#include "utils.h"
#include <ext2fs/ext2_fs.h>
#include <ext2fs/ext2fs.h>
#include <ext2fs/ext2_ext_attr.h>
#define INO_OFFSET (BTRFS_FIRST_FREE_OBJECTID - EXT2_ROOT_INO)
#define STRIPE_LEN (64 * 1024)
#define EXT2_IMAGE_SUBVOL_OBJECTID BTRFS_FIRST_FREE_OBJECTID
/*
* Open Ext2fs in readonly mode, read block allocation bitmap and
* inode bitmap into memory.
*/
static int open_ext2fs(const char *name, ext2_filsys *ret_fs)
{
errcode_t ret;
ext2_filsys ext2_fs;
ext2_ino_t ino;
ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs);
if (ret) {
fprintf(stderr, "ext2fs_open: %s\n", error_message(ret));
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);
}
*ret_fs = ext2_fs;
return 0;
fail:
return -1;
}
static int close_ext2fs(ext2_filsys fs)
{
ext2fs_close(fs);
return 0;
}
static int ext2_alloc_block(ext2_filsys fs, u64 goal, u64 *block_ret)
{
blk_t block;
if (!ext2fs_new_block(fs, goal, NULL, &block)) {
ext2fs_fast_mark_block_bitmap(fs->block_map, block);
*block_ret = block;
return 0;
}
return -ENOSPC;
}
static int ext2_free_block(ext2_filsys fs, u64 block)
{
BUG_ON(block != (blk_t)block);
ext2fs_fast_unmark_block_bitmap(fs->block_map, block);
return 0;
}
static int cache_free_extents(struct btrfs_root *root, ext2_filsys ext2_fs)
{
int i, ret = 0;
blk_t block;
u64 bytenr;
u64 blocksize = ext2_fs->blocksize;
block = ext2_fs->super->s_first_data_block;
for (; block < ext2_fs->super->s_blocks_count; block++) {
if (ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
continue;
bytenr = block * blocksize;
ret = set_extent_dirty(&root->fs_info->free_space_cache,
bytenr, bytenr + blocksize - 1, 0);
BUG_ON(ret);
}
for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
bytenr = btrfs_sb_offset(i);
bytenr &= ~((u64)STRIPE_LEN - 1);
if (bytenr >= blocksize * ext2_fs->super->s_blocks_count)
break;
clear_extent_dirty(&root->fs_info->free_space_cache, bytenr,
bytenr + STRIPE_LEN - 1, 0);
}
clear_extent_dirty(&root->fs_info->free_space_cache,
0, BTRFS_SUPER_INFO_OFFSET - 1, 0);
return 0;
}
static int custom_alloc_extent(struct btrfs_root *root, u64 num_bytes,
u64 hint_byte, struct btrfs_key *ins)
{
u64 start;
u64 end;
u64 last = hint_byte;
int ret;
int wrapped = 0;
struct btrfs_block_group_cache *cache;
while(1) {
ret = find_first_extent_bit(&root->fs_info->free_space_cache,
last, &start, &end, EXTENT_DIRTY);
if (ret) {
if (wrapped++ == 0) {
last = 0;
continue;
} else {
goto fail;
}
}
start = max(last, start);
last = end + 1;
if (last - start < num_bytes)
continue;
last = start + num_bytes;
if (test_range_bit(&root->fs_info->pinned_extents,
start, last - 1, EXTENT_DIRTY, 0))
continue;
cache = btrfs_lookup_block_group(root->fs_info, start);
BUG_ON(!cache);
if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM ||
last > cache->key.objectid + cache->key.offset) {
last = cache->key.objectid + cache->key.offset;
continue;
}
clear_extent_dirty(&root->fs_info->free_space_cache,
start, start + num_bytes - 1, 0);
ins->objectid = start;
ins->offset = num_bytes;
ins->type = BTRFS_EXTENT_ITEM_KEY;
return 0;
}
fail:
fprintf(stderr, "not enough free space\n");
return -ENOSPC;
}
static int intersect_with_sb(u64 bytenr, u64 num_bytes)
{
int i;
u64 offset;
for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
offset = btrfs_sb_offset(i);
offset &= ~((u64)STRIPE_LEN - 1);
if (bytenr < offset + STRIPE_LEN &&
bytenr + num_bytes > offset)
return 1;
}
return 0;
}
static int custom_free_extent(struct btrfs_root *root, u64 bytenr,
u64 num_bytes)
{
return intersect_with_sb(bytenr, num_bytes);
}
struct btrfs_extent_ops extent_ops = {
.alloc_extent = custom_alloc_extent,
.free_extent = custom_free_extent,
};
struct dir_iterate_data {
struct btrfs_trans_handle *trans;
struct btrfs_root *root;
struct btrfs_inode_item *inode;
u64 objectid;
u64 index_cnt;
u64 parent;
int errcode;
};
static u8 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 dir_iterate_proc(ext2_ino_t dir, int entry,
struct ext2_dir_entry *old,
int offset, int blocksize,
char *buf,void *priv_data)
{
int ret;
int file_type;
u64 objectid;
u64 inode_size;
char dotdot[] = "..";
struct btrfs_key location;
struct ext2_dir_entry_2 *dirent = (struct ext2_dir_entry_2 *)old;
struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data;
objectid = dirent->inode + INO_OFFSET;
if (!strncmp(dirent->name, dotdot, dirent->name_len)) {
if (dirent->name_len == 2) {
BUG_ON(idata->parent != 0);
idata->parent = objectid;
}
return 0;
}
if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO)
return 0;
location.objectid = objectid;
location.offset = 0;
btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
file_type = dirent->file_type;
BUG_ON(file_type > EXT2_FT_SYMLINK);
ret = btrfs_insert_dir_item(idata->trans, idata->root,
dirent->name, dirent->name_len,
idata->objectid, &location,
filetype_conversion_table[file_type],
idata->index_cnt);
if (ret)
goto fail;
ret = btrfs_insert_inode_ref(idata->trans, idata->root,
dirent->name, dirent->name_len,
objectid, idata->objectid,
idata->index_cnt);
if (ret)
goto fail;
idata->index_cnt++;
inode_size = btrfs_stack_inode_size(idata->inode) +
dirent->name_len * 2;
btrfs_set_stack_inode_size(idata->inode, inode_size);
return 0;
fail:
idata->errcode = ret;
return BLOCK_ABORT;
}
static int 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,
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 read_disk_extent(struct btrfs_root *root, u64 bytenr,
u32 num_bytes, char *buffer)
{
int ret;
struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
ret = pread(fs_devs->latest_bdev, buffer, num_bytes, bytenr);
if (ret != num_bytes)
goto fail;
ret = 0;
fail:
if (ret > 0)
ret = -1;
return ret;
}
/*
* Record a file extent. Do all the required works, such as inserting
* file extent item, inserting extent item and backref item into extent
* tree and updating block accounting.
*/
static int record_file_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 objectid,
struct btrfs_inode_item *inode,
u64 file_pos, u64 disk_bytenr,
u64 num_bytes, int checksum)
{
int ret;
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_root *extent_root = info->extent_root;
struct extent_buffer *leaf;
struct btrfs_file_extent_item *fi;
struct btrfs_key ins_key;
struct btrfs_path path;
struct btrfs_extent_item *ei;
u32 blocksize = root->sectorsize;
u64 nbytes;
if (disk_bytenr == 0) {
ret = btrfs_insert_file_extent(trans, root, objectid,
file_pos, disk_bytenr,
num_bytes, num_bytes);
return ret;
}
btrfs_init_path(&path);
if (checksum) {
u64 offset;
char *buffer;
ret = -ENOMEM;
buffer = malloc(blocksize);
if (!buffer)
goto fail;
for (offset = 0; offset < num_bytes; offset += blocksize) {
ret = read_disk_extent(root, disk_bytenr + offset,
blocksize, buffer);
if (ret)
break;
ret = btrfs_csum_file_block(trans,
root->fs_info->csum_root,
disk_bytenr + num_bytes,
disk_bytenr + offset,
buffer, blocksize);
if (ret)
break;
}
free(buffer);
if (ret)
goto fail;
}
ins_key.objectid = objectid;
ins_key.offset = file_pos;
btrfs_set_key_type(&ins_key, BTRFS_EXTENT_DATA_KEY);
ret = btrfs_insert_empty_item(trans, root, &path, &ins_key,
sizeof(*fi));
if (ret)
goto fail;
leaf = path.nodes[0];
fi = btrfs_item_ptr(leaf, path.slots[0],
struct btrfs_file_extent_item);
btrfs_set_file_extent_generation(leaf, fi, trans->transid);
btrfs_set_file_extent_type(leaf, fi, BTRFS_FILE_EXTENT_REG);
btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr);
btrfs_set_file_extent_disk_num_bytes(leaf, fi, num_bytes);
btrfs_set_file_extent_offset(leaf, fi, 0);
btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes);
btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes);
btrfs_set_file_extent_compression(leaf, fi, 0);
btrfs_set_file_extent_encryption(leaf, fi, 0);
btrfs_set_file_extent_other_encoding(leaf, fi, 0);
btrfs_mark_buffer_dirty(leaf);
nbytes = btrfs_stack_inode_nbytes(inode) + num_bytes;
btrfs_set_stack_inode_nbytes(inode, nbytes);
btrfs_release_path(root, &path);
ins_key.objectid = disk_bytenr;
ins_key.offset = num_bytes;
ins_key.type = BTRFS_EXTENT_ITEM_KEY;
ret = btrfs_insert_empty_item(trans, extent_root, &path,
&ins_key, sizeof(*ei));
if (ret == 0) {
leaf = path.nodes[0];
ei = btrfs_item_ptr(leaf, path.slots[0],
struct btrfs_extent_item);
btrfs_set_extent_refs(leaf, ei, 0);
btrfs_set_extent_generation(leaf, ei, 0);
btrfs_set_extent_flags(leaf, ei, BTRFS_EXTENT_FLAG_DATA);
btrfs_mark_buffer_dirty(leaf);
ret = btrfs_update_block_group(trans, root, disk_bytenr,
num_bytes, 1, 0);
if (ret)
goto fail;
} else if (ret != -EEXIST) {
goto fail;
}
btrfs_extent_post_op(trans, extent_root);
ret = btrfs_inc_extent_ref(trans, root, disk_bytenr, num_bytes, 0,
root->root_key.objectid,
objectid, file_pos);
if (ret)
goto fail;
ret = 0;
fail:
btrfs_release_path(root, &path);
return ret;
}
static int record_file_blocks(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 objectid,
struct btrfs_inode_item *inode,
u64 file_block, u64 disk_block,
u64 num_blocks, int checksum)
{
u64 file_pos = file_block * root->sectorsize;
u64 disk_bytenr = disk_block * root->sectorsize;
u64 num_bytes = num_blocks * root->sectorsize;
return record_file_extent(trans, root, objectid, inode, file_pos,
disk_bytenr, num_bytes, checksum);
}
struct blk_iterate_data {
struct btrfs_trans_handle *trans;
struct btrfs_root *root;
struct btrfs_inode_item *inode;
u64 objectid;
u64 first_block;
u64 disk_block;
u64 num_blocks;
u64 boundary;
int checksum;
int errcode;
};
static int block_iterate_proc(ext2_filsys ext2_fs,
u64 disk_block, u64 file_block,
struct blk_iterate_data *idata)
{
int ret;
int sb_region;
int do_barrier;
struct btrfs_root *root = idata->root;
struct btrfs_trans_handle *trans = idata->trans;
struct btrfs_block_group_cache *cache;
u64 bytenr = disk_block * root->sectorsize;
sb_region = intersect_with_sb(bytenr, root->sectorsize);
do_barrier = sb_region || disk_block >= idata->boundary;
if ((idata->num_blocks > 0 && do_barrier) ||
(file_block > idata->first_block + idata->num_blocks) ||
(disk_block != idata->disk_block + idata->num_blocks)) {
if (idata->num_blocks > 0) {
ret = record_file_blocks(trans, root, idata->objectid,
idata->inode, idata->first_block,
idata->disk_block, idata->num_blocks,
idata->checksum);
if (ret)
goto fail;
idata->first_block += idata->num_blocks;
idata->num_blocks = 0;
}
if (file_block > idata->first_block) {
ret = record_file_blocks(trans, root, idata->objectid,
idata->inode, idata->first_block,
0, file_block - idata->first_block,
idata->checksum);
if (ret)
goto fail;
}
if (sb_region) {
bytenr += STRIPE_LEN - 1;
bytenr &= ~((u64)STRIPE_LEN - 1);
} else {
cache = btrfs_lookup_block_group(root->fs_info, bytenr);
BUG_ON(!cache);
bytenr = cache->key.objectid + cache->key.offset;
}
idata->first_block = file_block;
idata->disk_block = disk_block;
idata->boundary = bytenr / root->sectorsize;
}
idata->num_blocks++;
return 0;
fail:
idata->errcode = ret;
return BLOCK_ABORT;
}
static int __block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
e2_blkcnt_t blockcnt, blk_t ref_block,
int ref_offset, void *priv_data)
{
struct blk_iterate_data *idata;
idata = (struct blk_iterate_data *)priv_data;
return block_iterate_proc(fs, *blocknr, blockcnt, idata);
}
/*
* traverse file's data blocks, record these data blocks as file extents.
*/
static int 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 = {
.trans = trans,
.root = root,
.inode = btrfs_inode,
.objectid = objectid,
.first_block = 0,
.disk_block = 0,
.num_blocks = 0,
.boundary = (u64)-1,
.checksum = datacsum,
.errcode = 0,
};
err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
NULL, __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(trans, root, objectid, btrfs_inode,
data.first_block, data.disk_block,
data.num_blocks, data.checksum);
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(trans, root, objectid, btrfs_inode,
data.first_block, 0, last_block -
data.first_block, data.checksum);
}
fail:
if (buffer)
free(buffer);
return ret;
error:
fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err));
return -1;
}
static int 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 = 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;
}
#define EXT2_ACL_VERSION 0x0001
typedef struct {
__le16 e_tag;
__le16 e_perm;
__le32 e_id;
} ext2_acl_entry;
typedef struct {
__le16 e_tag;
__le16 e_perm;
} ext2_acl_entry_short;
typedef struct {
__le32 a_version;
} ext2_acl_header;
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;
}
}
#define ACL_EA_VERSION 0x0002
typedef struct {
__le16 e_tag;
__le16 e_perm;
__le32 e_id;
} acl_ea_entry;
typedef struct {
__le32 a_version;
acl_ea_entry a_entries[0];
} acl_ea_header;
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 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:
if (databuf)
free(databuf);
return ret;
}
static int 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 = 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 = copy_single_xattr(trans, root, objectid,
entry, data, datalen);
if (ret)
goto out;
entry = EXT2_EXT_ATTR_NEXT(entry);
}
out:
if (buffer != NULL)
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);
}