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btrfs-progs/convert/source-ext2.c

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/*
* 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 <linux/limits.h>
#include <pthread.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;
int open_flag = EXT2_FLAG_SOFTSUPP_FEATURES | EXT2_FLAG_64BITS;
ret = ext2fs_open(name, open_flag, 0, 0, unix_io_manager, &ext2_fs);
if (ret) {
if (ret != EXT2_ET_BAD_MAGIC)
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);
ext2fs_free(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_space;
char *block_bitmap = NULL;
unsigned long i;
int block_nbytes;
int ret = 0;
block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
if (!block_nbytes) {
error("EXT2_CLUSTERS_PER_GROUP too small: %llu",
(unsigned long long)(EXT2_CLUSTERS_PER_GROUP(fs->super)));
return -EINVAL;
}
block_bitmap = malloc(block_nbytes);
if (!block_bitmap)
return -ENOMEM;
for (i = 0; i < fs->group_desc_count; i++) {
ret = ext2fs_get_block_bitmap_range2(fs->block_map, blk_itr,
block_nbytes * 8, block_bitmap);
if (ret) {
error("fail to get bitmap from ext2, %s",
error_message(ret));
ret = -EINVAL;
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);
ext2fs_free(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,
u32 convert_flags)
{
int ret;
char *buffer = NULL;
errcode_t err;
u32 last_block;
u32 sectorsize = root->fs_info->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,
convert_flags & CONVERT_FLAG_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 ((convert_flags & CONVERT_FLAG_INLINE_DATA) && data.first_block == 0
&& data.num_blocks > 0
&& inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root->fs_info)) {
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_symlink(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_blocks2(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,
CONVERT_FLAG_DATACSUM |
CONVERT_FLAG_INLINE_DATA);
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 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->fs_info) -
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_attr2(ext2_fs, ext2_inode->i_file_acl, buffer);
if (err) {
fprintf(stderr, "ext2fs_read_ext_attr2: %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;
}
static inline dev_t old_decode_dev(u16 val)
{
return MKDEV((val >> 8) & 255, val & 255);
}
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,
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 = btrfs_stack_inode_flags(dst);
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,
u32 convert_flags)
{
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 (!(convert_flags & CONVERT_FLAG_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, convert_flags);
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_symlink(trans, root, objectid,
&btrfs_inode, ext2_fs, ext2_ino, ext2_inode);
break;
default:
ret = 0;
break;
}
if (ret)
return ret;
if (convert_flags & CONVERT_FLAG_XATTR) {
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);
}
static int ext2_is_special_inode(ext2_ino_t ino)
{
if (ino < EXT2_GOOD_OLD_FIRST_INO && ino != EXT2_ROOT_INO)
return 1;
return 0;
}
/*
* scan ext2's inode bitmap and copy all used inodes.
*/
static int ext2_copy_inodes(struct btrfs_convert_context *cctx,
struct btrfs_root *root,
u32 convert_flags, 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 (IS_ERR(trans))
return PTR_ERR(trans);
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;
if (ext2_is_special_inode(ext2_ino))
continue;
objectid = ext2_ino + INO_OFFSET;
ret = ext2_copy_single_inode(trans, root,
objectid, ext2_fs, ext2_ino,
&ext2_inode, convert_flags);
pthread_mutex_lock(&p->mutex);
p->cur_copy_inodes++;
pthread_mutex_unlock(&p->mutex);
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(IS_ERR(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 */
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