mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-23 22:53:35 +00:00
9aae31f124
When copying inode, if there is a file referring part of a hole range, convert will fail. The problem is, when calculating real extent bytenr, it doesn't check if the original extent is a hole. In case the orinal extent is a hole, we still calculate bytenr using file_pos - found_extent_file_pos, causing non-zero value, and later btrfs_record_file_extent() detects that we are pointing to non-exist extent and aborts convert. Fix it by checking the disk_bytenr before calculating real disk bytenr. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.com>
3074 lines
79 KiB
C
3074 lines
79 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include "kerncompat.h"
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <uuid/uuid.h>
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#include <linux/limits.h>
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#include <getopt.h>
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#include "ctree.h"
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#include "disk-io.h"
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#include "volumes.h"
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#include "transaction.h"
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#include "crc32c.h"
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#include "utils.h"
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#include "task-utils.h"
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#include <ext2fs/ext2_fs.h>
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#include <ext2fs/ext2fs.h>
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#include <ext2fs/ext2_ext_attr.h>
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#define INO_OFFSET (BTRFS_FIRST_FREE_OBJECTID - EXT2_ROOT_INO)
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#define CONV_IMAGE_SUBVOL_OBJECTID BTRFS_FIRST_FREE_OBJECTID
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/*
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* Compatibility code for e2fsprogs 1.41 which doesn't support RO compat flag
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* BIGALLOC.
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* Unlike normal RO compat flag, BIGALLOC affects how e2fsprogs check used
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* space, and btrfs-convert heavily relies on it.
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*/
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#ifdef HAVE_OLD_E2FSPROGS
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#define EXT2FS_CLUSTER_RATIO(fs) (1)
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#define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_BLOCKS_PER_GROUP(s))
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#define EXT2FS_B2C(fs, blk) (blk)
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#endif
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struct task_ctx {
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uint32_t max_copy_inodes;
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uint32_t cur_copy_inodes;
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struct task_info *info;
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};
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static void *print_copied_inodes(void *p)
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{
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struct task_ctx *priv = p;
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const char work_indicator[] = { '.', 'o', 'O', 'o' };
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uint32_t count = 0;
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task_period_start(priv->info, 1000 /* 1s */);
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while (1) {
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count++;
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printf("copy inodes [%c] [%10d/%10d]\r",
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work_indicator[count % 4], priv->cur_copy_inodes,
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priv->max_copy_inodes);
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fflush(stdout);
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task_period_wait(priv->info);
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}
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return NULL;
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}
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static int after_copied_inodes(void *p)
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{
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printf("\n");
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fflush(stdout);
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return 0;
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}
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struct btrfs_convert_context;
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struct btrfs_convert_operations {
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const char *name;
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int (*open_fs)(struct btrfs_convert_context *cctx, const char *devname);
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int (*read_used_space)(struct btrfs_convert_context *cctx);
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int (*copy_inodes)(struct btrfs_convert_context *cctx,
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struct btrfs_root *root, int datacsum,
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int packing, int noxattr, struct task_ctx *p);
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void (*close_fs)(struct btrfs_convert_context *cctx);
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};
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static void init_convert_context(struct btrfs_convert_context *cctx)
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{
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cache_tree_init(&cctx->used);
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cache_tree_init(&cctx->data_chunks);
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cache_tree_init(&cctx->free);
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}
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static void clean_convert_context(struct btrfs_convert_context *cctx)
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{
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free_extent_cache_tree(&cctx->used);
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free_extent_cache_tree(&cctx->data_chunks);
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free_extent_cache_tree(&cctx->free);
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}
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static inline int copy_inodes(struct btrfs_convert_context *cctx,
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struct btrfs_root *root, int datacsum,
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int packing, int noxattr, struct task_ctx *p)
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{
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return cctx->convert_ops->copy_inodes(cctx, root, datacsum, packing,
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noxattr, p);
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}
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static inline void convert_close_fs(struct btrfs_convert_context *cctx)
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{
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cctx->convert_ops->close_fs(cctx);
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}
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/*
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* Open Ext2fs in readonly mode, read block allocation bitmap and
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* inode bitmap into memory.
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*/
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static int ext2_open_fs(struct btrfs_convert_context *cctx, const char *name)
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{
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errcode_t ret;
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ext2_filsys ext2_fs;
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ext2_ino_t ino;
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u32 ro_feature;
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ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs);
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if (ret) {
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fprintf(stderr, "ext2fs_open: %s\n", error_message(ret));
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return -1;
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}
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/*
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* We need to know exactly the used space, some RO compat flags like
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* BIGALLOC will affect how used space is present.
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* So we need manuall check any unsupported RO compat flags
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*/
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ro_feature = ext2_fs->super->s_feature_ro_compat;
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if (ro_feature & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
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error(
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"unsupported RO features detected: %x, abort convert to avoid possible corruption",
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ro_feature & ~EXT2_LIB_FEATURE_COMPAT_SUPP);
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goto fail;
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}
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ret = ext2fs_read_inode_bitmap(ext2_fs);
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if (ret) {
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fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n",
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error_message(ret));
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goto fail;
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}
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ret = ext2fs_read_block_bitmap(ext2_fs);
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if (ret) {
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fprintf(stderr, "ext2fs_read_block_bitmap: %s\n",
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error_message(ret));
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goto fail;
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}
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/*
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* search each block group for a free inode. this set up
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* uninit block/inode bitmaps appropriately.
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*/
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ino = 1;
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while (ino <= ext2_fs->super->s_inodes_count) {
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ext2_ino_t foo;
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ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo);
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ino += EXT2_INODES_PER_GROUP(ext2_fs->super);
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}
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if (!(ext2_fs->super->s_feature_incompat &
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EXT2_FEATURE_INCOMPAT_FILETYPE)) {
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fprintf(stderr, "filetype feature is missing\n");
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goto fail;
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}
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cctx->fs_data = ext2_fs;
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cctx->blocksize = ext2_fs->blocksize;
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cctx->block_count = ext2_fs->super->s_blocks_count;
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cctx->total_bytes = ext2_fs->blocksize * ext2_fs->super->s_blocks_count;
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cctx->volume_name = strndup(ext2_fs->super->s_volume_name, 16);
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cctx->first_data_block = ext2_fs->super->s_first_data_block;
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cctx->inodes_count = ext2_fs->super->s_inodes_count;
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cctx->free_inodes_count = ext2_fs->super->s_free_inodes_count;
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return 0;
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fail:
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ext2fs_close(ext2_fs);
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return -1;
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}
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static int __ext2_add_one_block(ext2_filsys fs, char *bitmap,
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unsigned long group_nr, struct cache_tree *used)
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{
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unsigned long offset;
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unsigned i;
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int ret = 0;
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offset = fs->super->s_first_data_block;
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offset /= EXT2FS_CLUSTER_RATIO(fs);
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offset += group_nr * EXT2_CLUSTERS_PER_GROUP(fs->super);
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for (i = 0; i < EXT2_CLUSTERS_PER_GROUP(fs->super); i++) {
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if (ext2fs_test_bit(i, bitmap)) {
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u64 start;
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start = (i + offset) * EXT2FS_CLUSTER_RATIO(fs);
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start *= fs->blocksize;
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ret = add_merge_cache_extent(used, start,
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fs->blocksize);
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if (ret < 0)
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break;
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}
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}
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return ret;
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}
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/*
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* Read all used ext2 space into cctx->used cache tree
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*/
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static int ext2_read_used_space(struct btrfs_convert_context *cctx)
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{
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ext2_filsys fs = (ext2_filsys)cctx->fs_data;
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blk64_t blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block);
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struct cache_tree *used_tree = &cctx->used;
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char *block_bitmap = NULL;
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unsigned long i;
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int block_nbytes;
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int ret = 0;
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block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
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/* Shouldn't happen */
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BUG_ON(!fs->block_map);
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block_bitmap = malloc(block_nbytes);
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if (!block_bitmap)
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return -ENOMEM;
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for (i = 0; i < fs->group_desc_count; i++) {
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ret = ext2fs_get_block_bitmap_range(fs->block_map, blk_itr,
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block_nbytes * 8, block_bitmap);
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if (ret) {
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error("fail to get bitmap from ext2, %s",
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strerror(-ret));
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break;
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}
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ret = __ext2_add_one_block(fs, block_bitmap, i, used_tree);
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if (ret < 0) {
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error("fail to build used space tree, %s",
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strerror(-ret));
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break;
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}
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blk_itr += EXT2_CLUSTERS_PER_GROUP(fs->super);
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}
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free(block_bitmap);
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return ret;
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}
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static void ext2_close_fs(struct btrfs_convert_context *cctx)
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{
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if (cctx->volume_name) {
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free(cctx->volume_name);
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cctx->volume_name = NULL;
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}
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ext2fs_close(cctx->fs_data);
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}
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static int intersect_with_sb(u64 bytenr, u64 num_bytes)
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{
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int i;
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u64 offset;
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for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
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offset = btrfs_sb_offset(i);
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offset &= ~((u64)BTRFS_STRIPE_LEN - 1);
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if (bytenr < offset + BTRFS_STRIPE_LEN &&
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bytenr + num_bytes > offset)
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return 1;
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}
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return 0;
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}
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static int convert_insert_dirent(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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const char *name, size_t name_len,
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u64 dir, u64 objectid,
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u8 file_type, u64 index_cnt,
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struct btrfs_inode_item *inode)
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{
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int ret;
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u64 inode_size;
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struct btrfs_key location = {
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.objectid = objectid,
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.offset = 0,
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.type = BTRFS_INODE_ITEM_KEY,
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};
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ret = btrfs_insert_dir_item(trans, root, name, name_len,
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dir, &location, file_type, index_cnt);
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if (ret)
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return ret;
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ret = btrfs_insert_inode_ref(trans, root, name, name_len,
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objectid, dir, index_cnt);
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if (ret)
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return ret;
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inode_size = btrfs_stack_inode_size(inode) + name_len * 2;
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btrfs_set_stack_inode_size(inode, inode_size);
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return 0;
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}
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struct dir_iterate_data {
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struct btrfs_trans_handle *trans;
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struct btrfs_root *root;
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struct btrfs_inode_item *inode;
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u64 objectid;
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u64 index_cnt;
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u64 parent;
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int errcode;
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};
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static u8 filetype_conversion_table[EXT2_FT_MAX] = {
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[EXT2_FT_UNKNOWN] = BTRFS_FT_UNKNOWN,
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[EXT2_FT_REG_FILE] = BTRFS_FT_REG_FILE,
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[EXT2_FT_DIR] = BTRFS_FT_DIR,
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[EXT2_FT_CHRDEV] = BTRFS_FT_CHRDEV,
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[EXT2_FT_BLKDEV] = BTRFS_FT_BLKDEV,
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[EXT2_FT_FIFO] = BTRFS_FT_FIFO,
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[EXT2_FT_SOCK] = BTRFS_FT_SOCK,
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[EXT2_FT_SYMLINK] = BTRFS_FT_SYMLINK,
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};
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static int dir_iterate_proc(ext2_ino_t dir, int entry,
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struct ext2_dir_entry *dirent,
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int offset, int blocksize,
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char *buf,void *priv_data)
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{
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int ret;
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int file_type;
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u64 objectid;
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char dotdot[] = "..";
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struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data;
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int name_len;
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name_len = dirent->name_len & 0xFF;
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objectid = dirent->inode + INO_OFFSET;
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if (!strncmp(dirent->name, dotdot, name_len)) {
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if (name_len == 2) {
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BUG_ON(idata->parent != 0);
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idata->parent = objectid;
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}
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return 0;
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}
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if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO)
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return 0;
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file_type = dirent->name_len >> 8;
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BUG_ON(file_type > EXT2_FT_SYMLINK);
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ret = convert_insert_dirent(idata->trans, idata->root, dirent->name,
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name_len, idata->objectid, objectid,
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filetype_conversion_table[file_type],
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idata->index_cnt, idata->inode);
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if (ret < 0) {
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idata->errcode = ret;
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return BLOCK_ABORT;
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}
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idata->index_cnt++;
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return 0;
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}
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|
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static int create_dir_entries(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, u64 objectid,
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struct btrfs_inode_item *btrfs_inode,
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ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
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{
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int ret;
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errcode_t err;
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struct dir_iterate_data data = {
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.trans = trans,
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.root = root,
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.inode = btrfs_inode,
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.objectid = objectid,
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.index_cnt = 2,
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.parent = 0,
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.errcode = 0,
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};
|
|
|
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err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL,
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dir_iterate_proc, &data);
|
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if (err)
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goto error;
|
|
ret = data.errcode;
|
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if (ret == 0 && data.parent == objectid) {
|
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ret = btrfs_insert_inode_ref(trans, root, "..", 2,
|
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objectid, objectid, 0);
|
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}
|
|
return ret;
|
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error:
|
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fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err));
|
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return -1;
|
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}
|
|
|
|
static int read_disk_extent(struct btrfs_root *root, u64 bytenr,
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u32 num_bytes, char *buffer)
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|
{
|
|
int ret;
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struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices;
|
|
|
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ret = pread(fs_devs->latest_bdev, buffer, num_bytes, bytenr);
|
|
if (ret != num_bytes)
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goto fail;
|
|
ret = 0;
|
|
fail:
|
|
if (ret > 0)
|
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ret = -1;
|
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return ret;
|
|
}
|
|
|
|
static int csum_disk_extent(struct btrfs_trans_handle *trans,
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|
struct btrfs_root *root,
|
|
u64 disk_bytenr, u64 num_bytes)
|
|
{
|
|
u32 blocksize = root->sectorsize;
|
|
u64 offset;
|
|
char *buffer;
|
|
int ret = 0;
|
|
|
|
buffer = malloc(blocksize);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
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);
|
|
return ret;
|
|
}
|
|
|
|
struct blk_iterate_data {
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *root;
|
|
struct btrfs_root *convert_root;
|
|
struct btrfs_inode_item *inode;
|
|
u64 convert_ino;
|
|
u64 objectid;
|
|
u64 first_block;
|
|
u64 disk_block;
|
|
u64 num_blocks;
|
|
u64 boundary;
|
|
int checksum;
|
|
int errcode;
|
|
};
|
|
|
|
static void init_blk_iterate_data(struct blk_iterate_data *data,
|
|
struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_inode_item *inode,
|
|
u64 objectid, int checksum)
|
|
{
|
|
struct btrfs_key key;
|
|
|
|
data->trans = trans;
|
|
data->root = root;
|
|
data->inode = inode;
|
|
data->objectid = objectid;
|
|
data->first_block = 0;
|
|
data->disk_block = 0;
|
|
data->num_blocks = 0;
|
|
data->boundary = (u64)-1;
|
|
data->checksum = checksum;
|
|
data->errcode = 0;
|
|
|
|
key.objectid = CONV_IMAGE_SUBVOL_OBJECTID;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
data->convert_root = btrfs_read_fs_root(root->fs_info, &key);
|
|
/* Impossible as we just opened it before */
|
|
BUG_ON(!data->convert_root || IS_ERR(data->convert_root));
|
|
data->convert_ino = BTRFS_FIRST_FREE_OBJECTID + 1;
|
|
}
|
|
|
|
/*
|
|
* Record a file extent in original filesystem into btrfs one.
|
|
* The special point is, old disk_block can point to a reserved range.
|
|
* So here, we don't use disk_block directly but search convert_root
|
|
* to get the real disk_bytenr.
|
|
*/
|
|
static int record_file_blocks(struct blk_iterate_data *data,
|
|
u64 file_block, u64 disk_block, u64 num_blocks)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_root *root = data->root;
|
|
struct btrfs_root *convert_root = data->convert_root;
|
|
struct btrfs_path *path;
|
|
u64 file_pos = file_block * root->sectorsize;
|
|
u64 old_disk_bytenr = disk_block * root->sectorsize;
|
|
u64 num_bytes = num_blocks * root->sectorsize;
|
|
u64 cur_off = old_disk_bytenr;
|
|
|
|
/* Hole, pass it to record_file_extent directly */
|
|
if (old_disk_bytenr == 0)
|
|
return btrfs_record_file_extent(data->trans, root,
|
|
data->objectid, data->inode, file_pos, 0,
|
|
num_bytes);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Search real disk bytenr from convert root
|
|
*/
|
|
while (cur_off < old_disk_bytenr + num_bytes) {
|
|
struct btrfs_key key;
|
|
struct btrfs_file_extent_item *fi;
|
|
struct extent_buffer *node;
|
|
int slot;
|
|
u64 extent_disk_bytenr;
|
|
u64 extent_num_bytes;
|
|
u64 real_disk_bytenr;
|
|
u64 cur_len;
|
|
|
|
key.objectid = data->convert_ino;
|
|
key.type = BTRFS_EXTENT_DATA_KEY;
|
|
key.offset = cur_off;
|
|
|
|
ret = btrfs_search_slot(NULL, convert_root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
break;
|
|
if (ret > 0) {
|
|
ret = btrfs_previous_item(convert_root, path,
|
|
data->convert_ino,
|
|
BTRFS_EXTENT_DATA_KEY);
|
|
if (ret < 0)
|
|
break;
|
|
if (ret > 0) {
|
|
ret = -ENOENT;
|
|
break;
|
|
}
|
|
}
|
|
node = path->nodes[0];
|
|
slot = path->slots[0];
|
|
btrfs_item_key_to_cpu(node, &key, slot);
|
|
BUG_ON(key.type != BTRFS_EXTENT_DATA_KEY ||
|
|
key.objectid != data->convert_ino ||
|
|
key.offset > cur_off);
|
|
fi = btrfs_item_ptr(node, slot, struct btrfs_file_extent_item);
|
|
extent_disk_bytenr = btrfs_file_extent_disk_bytenr(node, fi);
|
|
extent_num_bytes = btrfs_file_extent_disk_num_bytes(node, fi);
|
|
BUG_ON(cur_off - key.offset >= extent_num_bytes);
|
|
btrfs_release_path(path);
|
|
|
|
if (extent_disk_bytenr)
|
|
real_disk_bytenr = cur_off - key.offset +
|
|
extent_disk_bytenr;
|
|
else
|
|
real_disk_bytenr = 0;
|
|
cur_len = min(key.offset + extent_num_bytes,
|
|
old_disk_bytenr + num_bytes) - cur_off;
|
|
ret = btrfs_record_file_extent(data->trans, data->root,
|
|
data->objectid, data->inode, file_pos,
|
|
real_disk_bytenr, cur_len);
|
|
if (ret < 0)
|
|
break;
|
|
cur_off += cur_len;
|
|
file_pos += cur_len;
|
|
|
|
/*
|
|
* No need to care about csum
|
|
* As every byte of old fs image is calculated for csum, no
|
|
* need to waste CPU cycles now.
|
|
*/
|
|
}
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int block_iterate_proc(u64 disk_block, u64 file_block,
|
|
struct blk_iterate_data *idata)
|
|
{
|
|
int ret = 0;
|
|
int sb_region;
|
|
int do_barrier;
|
|
struct btrfs_root *root = idata->root;
|
|
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(idata, idata->first_block,
|
|
idata->disk_block,
|
|
idata->num_blocks);
|
|
if (ret)
|
|
goto fail;
|
|
idata->first_block += idata->num_blocks;
|
|
idata->num_blocks = 0;
|
|
}
|
|
if (file_block > idata->first_block) {
|
|
ret = record_file_blocks(idata, idata->first_block,
|
|
0, file_block - idata->first_block);
|
|
if (ret)
|
|
goto fail;
|
|
}
|
|
|
|
if (sb_region) {
|
|
bytenr += BTRFS_STRIPE_LEN - 1;
|
|
bytenr &= ~((u64)BTRFS_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++;
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
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)
|
|
{
|
|
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 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, __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 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
|
|
|
|
/* 23.2.5 acl_tag_t values */
|
|
|
|
#define ACL_UNDEFINED_TAG (0x00)
|
|
#define ACL_USER_OBJ (0x01)
|
|
#define ACL_USER (0x02)
|
|
#define ACL_GROUP_OBJ (0x04)
|
|
#define ACL_GROUP (0x08)
|
|
#define ACL_MASK (0x10)
|
|
#define ACL_OTHER (0x20)
|
|
|
|
/* 23.2.7 ACL qualifier constants */
|
|
|
|
#define ACL_UNDEFINED_ID ((id_t)-1)
|
|
|
|
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:
|
|
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:
|
|
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 int 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));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* copy a single inode. do all the required works, such as cloning
|
|
* inode item, creating file extents and creating directory entries.
|
|
*/
|
|
static int 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;
|
|
|
|
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);
|
|
}
|
|
|
|
switch (ext2_inode->i_mode & S_IFMT) {
|
|
case S_IFREG:
|
|
ret = create_file_extents(trans, root, objectid, &btrfs_inode,
|
|
ext2_fs, ext2_ino, datacsum, packing);
|
|
break;
|
|
case S_IFDIR:
|
|
ret = create_dir_entries(trans, root, objectid, &btrfs_inode,
|
|
ext2_fs, ext2_ino);
|
|
break;
|
|
case S_IFLNK:
|
|
ret = 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 = 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 = 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 int create_image_file_range(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct cache_tree *used,
|
|
struct btrfs_inode_item *inode,
|
|
u64 ino, u64 bytenr, u64 *ret_len,
|
|
int datacsum)
|
|
{
|
|
struct cache_extent *cache;
|
|
struct btrfs_block_group_cache *bg_cache;
|
|
u64 len = *ret_len;
|
|
u64 disk_bytenr;
|
|
int i;
|
|
int ret;
|
|
|
|
BUG_ON(bytenr != round_down(bytenr, root->sectorsize));
|
|
BUG_ON(len != round_down(len, root->sectorsize));
|
|
len = min_t(u64, len, BTRFS_MAX_EXTENT_SIZE);
|
|
|
|
/*
|
|
* Skip sb ranges first
|
|
* [0, 1M), [sb_offset(1), +64K), [sb_offset(2), +64K].
|
|
*
|
|
* Or we will insert a hole into current image file, and later
|
|
* migrate block will fail as there is already a file extent.
|
|
*/
|
|
if (bytenr < 1024 * 1024) {
|
|
*ret_len = 1024 * 1024 - bytenr;
|
|
return 0;
|
|
}
|
|
for (i = 1; i < BTRFS_SUPER_MIRROR_MAX; i++) {
|
|
u64 cur = btrfs_sb_offset(i);
|
|
|
|
if (bytenr >= cur && bytenr < cur + BTRFS_STRIPE_LEN) {
|
|
*ret_len = cur + BTRFS_STRIPE_LEN - bytenr;
|
|
return 0;
|
|
}
|
|
}
|
|
for (i = 1; i < BTRFS_SUPER_MIRROR_MAX; i++) {
|
|
u64 cur = btrfs_sb_offset(i);
|
|
|
|
/*
|
|
* |--reserved--|
|
|
* |----range-------|
|
|
* May still need to go through file extent inserts
|
|
*/
|
|
if (bytenr < cur && bytenr + len >= cur) {
|
|
len = min_t(u64, len, cur - bytenr);
|
|
break;
|
|
}
|
|
/*
|
|
* |--reserved--|
|
|
* |---range---|
|
|
* Drop out, no need to insert anything
|
|
*/
|
|
if (bytenr >= cur && bytenr < cur + BTRFS_STRIPE_LEN) {
|
|
*ret_len = cur + BTRFS_STRIPE_LEN - bytenr;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
cache = search_cache_extent(used, bytenr);
|
|
if (cache) {
|
|
if (cache->start <= bytenr) {
|
|
/*
|
|
* |///////Used///////|
|
|
* |<--insert--->|
|
|
* bytenr
|
|
*/
|
|
len = min_t(u64, len, cache->start + cache->size -
|
|
bytenr);
|
|
disk_bytenr = bytenr;
|
|
} else {
|
|
/*
|
|
* |//Used//|
|
|
* |<-insert-->|
|
|
* bytenr
|
|
*/
|
|
len = min(len, cache->start - bytenr);
|
|
disk_bytenr = 0;
|
|
datacsum = 0;
|
|
}
|
|
} else {
|
|
/*
|
|
* |//Used//| |EOF
|
|
* |<-insert-->|
|
|
* bytenr
|
|
*/
|
|
disk_bytenr = 0;
|
|
datacsum = 0;
|
|
}
|
|
|
|
if (disk_bytenr) {
|
|
/* Check if the range is in a data block group */
|
|
bg_cache = btrfs_lookup_block_group(root->fs_info, bytenr);
|
|
if (!bg_cache)
|
|
return -ENOENT;
|
|
if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_DATA))
|
|
return -EINVAL;
|
|
|
|
/* The extent should never cross block group boundary */
|
|
len = min_t(u64, len, bg_cache->key.objectid +
|
|
bg_cache->key.offset - bytenr);
|
|
}
|
|
|
|
BUG_ON(len != round_down(len, root->sectorsize));
|
|
ret = btrfs_record_file_extent(trans, root, ino, inode, bytenr,
|
|
disk_bytenr, len);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (datacsum)
|
|
ret = csum_disk_extent(trans, root, bytenr, len);
|
|
*ret_len = len;
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* Relocate old fs data in one reserved ranges
|
|
*
|
|
* Since all old fs data in reserved range is not covered by any chunk nor
|
|
* data extent, we don't need to handle any reference but add new
|
|
* extent/reference, which makes codes more clear
|
|
*/
|
|
static int migrate_one_reserved_range(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct cache_tree *used,
|
|
struct btrfs_inode_item *inode, int fd,
|
|
u64 ino, u64 start, u64 len, int datacsum)
|
|
{
|
|
u64 cur_off = start;
|
|
u64 cur_len = len;
|
|
u64 hole_start = start;
|
|
u64 hole_len;
|
|
struct cache_extent *cache;
|
|
struct btrfs_key key;
|
|
struct extent_buffer *eb;
|
|
int ret = 0;
|
|
|
|
while (cur_off < start + len) {
|
|
cache = lookup_cache_extent(used, cur_off, cur_len);
|
|
if (!cache)
|
|
break;
|
|
cur_off = max(cache->start, cur_off);
|
|
cur_len = min(cache->start + cache->size, start + len) -
|
|
cur_off;
|
|
BUG_ON(cur_len < root->sectorsize);
|
|
|
|
/* reserve extent for the data */
|
|
ret = btrfs_reserve_extent(trans, root, cur_len, 0, 0, (u64)-1,
|
|
&key, 1);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
eb = malloc(sizeof(*eb) + cur_len);
|
|
if (!eb) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
ret = pread(fd, eb->data, cur_len, cur_off);
|
|
if (ret < cur_len) {
|
|
ret = (ret < 0 ? ret : -EIO);
|
|
free(eb);
|
|
break;
|
|
}
|
|
eb->start = key.objectid;
|
|
eb->len = key.offset;
|
|
|
|
/* Write the data */
|
|
ret = write_and_map_eb(trans, root, eb);
|
|
free(eb);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
/* Now handle extent item and file extent things */
|
|
ret = btrfs_record_file_extent(trans, root, ino, inode, cur_off,
|
|
key.objectid, key.offset);
|
|
if (ret < 0)
|
|
break;
|
|
/* Finally, insert csum items */
|
|
if (datacsum)
|
|
ret = csum_disk_extent(trans, root, key.objectid,
|
|
key.offset);
|
|
|
|
/* Don't forget to insert hole */
|
|
hole_len = cur_off - hole_start;
|
|
if (hole_len) {
|
|
ret = btrfs_record_file_extent(trans, root, ino, inode,
|
|
hole_start, 0, hole_len);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
|
|
cur_off += key.offset;
|
|
hole_start = cur_off;
|
|
cur_len = start + len - cur_off;
|
|
}
|
|
/* Last hole */
|
|
if (start + len - hole_start > 0)
|
|
ret = btrfs_record_file_extent(trans, root, ino, inode,
|
|
hole_start, 0, start + len - hole_start);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Relocate the used ext2 data in reserved ranges
|
|
* [0,1M)
|
|
* [btrfs_sb_offset(1), +BTRFS_STRIPE_LEN)
|
|
* [btrfs_sb_offset(2), +BTRFS_STRIPE_LEN)
|
|
*/
|
|
static int migrate_reserved_ranges(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct cache_tree *used,
|
|
struct btrfs_inode_item *inode, int fd,
|
|
u64 ino, u64 total_bytes, int datacsum)
|
|
{
|
|
u64 cur_off;
|
|
u64 cur_len;
|
|
int ret = 0;
|
|
|
|
/* 0 ~ 1M */
|
|
cur_off = 0;
|
|
cur_len = 1024 * 1024;
|
|
ret = migrate_one_reserved_range(trans, root, used, inode, fd, ino,
|
|
cur_off, cur_len, datacsum);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* second sb(fisrt sb is included in 0~1M) */
|
|
cur_off = btrfs_sb_offset(1);
|
|
cur_len = min(total_bytes, cur_off + BTRFS_STRIPE_LEN) - cur_off;
|
|
if (cur_off > total_bytes)
|
|
return ret;
|
|
ret = migrate_one_reserved_range(trans, root, used, inode, fd, ino,
|
|
cur_off, cur_len, datacsum);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Last sb */
|
|
cur_off = btrfs_sb_offset(2);
|
|
cur_len = min(total_bytes, cur_off + BTRFS_STRIPE_LEN) - cur_off;
|
|
if (cur_off > total_bytes)
|
|
return ret;
|
|
ret = migrate_one_reserved_range(trans, root, used, inode, fd, ino,
|
|
cur_off, cur_len, datacsum);
|
|
return ret;
|
|
}
|
|
|
|
static int wipe_reserved_ranges(struct cache_tree *tree, u64 min_stripe_size,
|
|
int ensure_size);
|
|
|
|
/*
|
|
* Create the fs image file of old filesystem.
|
|
*
|
|
* This is completely fs independent as we have cctx->used, only
|
|
* need to create file extents pointing to all the positions.
|
|
*/
|
|
static int create_image(struct btrfs_root *root,
|
|
struct btrfs_mkfs_config *cfg,
|
|
struct btrfs_convert_context *cctx, int fd,
|
|
u64 size, char *name, int datacsum)
|
|
{
|
|
struct btrfs_inode_item buf;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_path *path = NULL;
|
|
struct btrfs_key key;
|
|
struct cache_extent *cache;
|
|
struct cache_tree used_tmp;
|
|
u64 cur;
|
|
u64 ino;
|
|
int ret;
|
|
|
|
trans = btrfs_start_transaction(root, 1);
|
|
if (!trans)
|
|
return -ENOMEM;
|
|
|
|
cache_tree_init(&used_tmp);
|
|
|
|
ret = btrfs_find_free_objectid(trans, root, BTRFS_FIRST_FREE_OBJECTID,
|
|
&ino);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = btrfs_new_inode(trans, root, ino, 0600 | S_IFREG);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = btrfs_add_link(trans, root, ino, BTRFS_FIRST_FREE_OBJECTID, name,
|
|
strlen(name), BTRFS_FT_REG_FILE, NULL, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
key.objectid = ino;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.offset = 0;
|
|
|
|
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
|
|
if (ret) {
|
|
ret = (ret > 0 ? -ENOENT : ret);
|
|
goto out;
|
|
}
|
|
read_extent_buffer(path->nodes[0], &buf,
|
|
btrfs_item_ptr_offset(path->nodes[0], path->slots[0]),
|
|
sizeof(buf));
|
|
btrfs_release_path(path);
|
|
|
|
/*
|
|
* Create a new used space cache, which doesn't contain the reserved
|
|
* range
|
|
*/
|
|
for (cache = first_cache_extent(&cctx->used); cache;
|
|
cache = next_cache_extent(cache)) {
|
|
ret = add_cache_extent(&used_tmp, cache->start, cache->size);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
ret = wipe_reserved_ranges(&used_tmp, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Start from 1M, as 0~1M is reserved, and create_image_file_range()
|
|
* can't handle bytenr 0(will consider it as a hole)
|
|
*/
|
|
cur = 1024 * 1024;
|
|
while (cur < size) {
|
|
u64 len = size - cur;
|
|
|
|
ret = create_image_file_range(trans, root, &used_tmp,
|
|
&buf, ino, cur, &len, datacsum);
|
|
if (ret < 0)
|
|
goto out;
|
|
cur += len;
|
|
}
|
|
/* Handle the reserved ranges */
|
|
ret = migrate_reserved_ranges(trans, root, &cctx->used, &buf, fd, ino,
|
|
cfg->num_bytes, datacsum);
|
|
|
|
|
|
key.objectid = ino;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.offset = 0;
|
|
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
|
|
if (ret) {
|
|
ret = (ret > 0 ? -ENOENT : ret);
|
|
goto out;
|
|
}
|
|
btrfs_set_stack_inode_size(&buf, cfg->num_bytes);
|
|
write_extent_buffer(path->nodes[0], &buf,
|
|
btrfs_item_ptr_offset(path->nodes[0], path->slots[0]),
|
|
sizeof(buf));
|
|
out:
|
|
free_extent_cache_tree(&used_tmp);
|
|
btrfs_free_path(path);
|
|
btrfs_commit_transaction(trans, root);
|
|
return ret;
|
|
}
|
|
|
|
static struct btrfs_root * link_subvol(struct btrfs_root *root,
|
|
const char *base, u64 root_objectid)
|
|
{
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_root *new_root = NULL;
|
|
struct btrfs_path *path;
|
|
struct btrfs_inode_item *inode_item;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key key;
|
|
u64 dirid = btrfs_root_dirid(&root->root_item);
|
|
u64 index = 2;
|
|
char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
|
|
int len;
|
|
int i;
|
|
int ret;
|
|
|
|
len = strlen(base);
|
|
if (len == 0 || len > BTRFS_NAME_LEN)
|
|
return NULL;
|
|
|
|
path = btrfs_alloc_path();
|
|
BUG_ON(!path);
|
|
|
|
key.objectid = dirid;
|
|
key.type = BTRFS_DIR_INDEX_KEY;
|
|
key.offset = (u64)-1;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
BUG_ON(ret <= 0);
|
|
|
|
if (path->slots[0] > 0) {
|
|
path->slots[0]--;
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
|
|
if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
|
|
index = key.offset + 1;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
trans = btrfs_start_transaction(root, 1);
|
|
BUG_ON(!trans);
|
|
|
|
key.objectid = dirid;
|
|
key.offset = 0;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
|
|
ret = btrfs_lookup_inode(trans, root, path, &key, 1);
|
|
BUG_ON(ret);
|
|
leaf = path->nodes[0];
|
|
inode_item = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_inode_item);
|
|
|
|
key.objectid = root_objectid;
|
|
key.offset = (u64)-1;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
|
|
memcpy(buf, base, len);
|
|
for (i = 0; i < 1024; i++) {
|
|
ret = btrfs_insert_dir_item(trans, root, buf, len,
|
|
dirid, &key, BTRFS_FT_DIR, index);
|
|
if (ret != -EEXIST)
|
|
break;
|
|
len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
|
|
if (len < 1 || len > BTRFS_NAME_LEN) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
if (ret)
|
|
goto fail;
|
|
|
|
btrfs_set_inode_size(leaf, inode_item, len * 2 +
|
|
btrfs_inode_size(leaf, inode_item));
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
btrfs_release_path(path);
|
|
|
|
/* add the backref first */
|
|
ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
|
|
BTRFS_ROOT_BACKREF_KEY,
|
|
root->root_key.objectid,
|
|
dirid, index, buf, len);
|
|
BUG_ON(ret);
|
|
|
|
/* now add the forward ref */
|
|
ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
|
|
BTRFS_ROOT_REF_KEY, root_objectid,
|
|
dirid, index, buf, len);
|
|
|
|
ret = btrfs_commit_transaction(trans, root);
|
|
BUG_ON(ret);
|
|
|
|
new_root = btrfs_read_fs_root(fs_info, &key);
|
|
if (IS_ERR(new_root))
|
|
new_root = NULL;
|
|
fail:
|
|
btrfs_free_path(path);
|
|
return new_root;
|
|
}
|
|
|
|
static int create_subvol(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, u64 root_objectid)
|
|
{
|
|
struct extent_buffer *tmp;
|
|
struct btrfs_root *new_root;
|
|
struct btrfs_key key;
|
|
struct btrfs_root_item root_item;
|
|
int ret;
|
|
|
|
ret = btrfs_copy_root(trans, root, root->node, &tmp,
|
|
root_objectid);
|
|
BUG_ON(ret);
|
|
|
|
memcpy(&root_item, &root->root_item, sizeof(root_item));
|
|
btrfs_set_root_bytenr(&root_item, tmp->start);
|
|
btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
|
|
btrfs_set_root_generation(&root_item, trans->transid);
|
|
free_extent_buffer(tmp);
|
|
|
|
key.objectid = root_objectid;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = trans->transid;
|
|
ret = btrfs_insert_root(trans, root->fs_info->tree_root,
|
|
&key, &root_item);
|
|
|
|
key.offset = (u64)-1;
|
|
new_root = btrfs_read_fs_root(root->fs_info, &key);
|
|
BUG_ON(!new_root || IS_ERR(new_root));
|
|
|
|
ret = btrfs_make_root_dir(trans, new_root, BTRFS_FIRST_FREE_OBJECTID);
|
|
BUG_ON(ret);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* New make_btrfs() has handle system and meta chunks quite well.
|
|
* So only need to add remaining data chunks.
|
|
*/
|
|
static int make_convert_data_block_groups(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_mkfs_config *cfg,
|
|
struct btrfs_convert_context *cctx)
|
|
{
|
|
struct btrfs_root *extent_root = fs_info->extent_root;
|
|
struct cache_tree *data_chunks = &cctx->data_chunks;
|
|
struct cache_extent *cache;
|
|
u64 max_chunk_size;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* Don't create data chunk over 10% of the convert device
|
|
* And for single chunk, don't create chunk larger than 1G.
|
|
*/
|
|
max_chunk_size = cfg->num_bytes / 10;
|
|
max_chunk_size = min((u64)(1024 * 1024 * 1024), max_chunk_size);
|
|
max_chunk_size = round_down(max_chunk_size, extent_root->sectorsize);
|
|
|
|
for (cache = first_cache_extent(data_chunks); cache;
|
|
cache = next_cache_extent(cache)) {
|
|
u64 cur = cache->start;
|
|
|
|
while (cur < cache->start + cache->size) {
|
|
u64 len;
|
|
u64 cur_backup = cur;
|
|
|
|
len = min(max_chunk_size,
|
|
cache->start + cache->size - cur);
|
|
ret = btrfs_alloc_data_chunk(trans, extent_root,
|
|
&cur_backup, len,
|
|
BTRFS_BLOCK_GROUP_DATA, 1);
|
|
if (ret < 0)
|
|
break;
|
|
ret = btrfs_make_block_group(trans, extent_root, 0,
|
|
BTRFS_BLOCK_GROUP_DATA,
|
|
BTRFS_FIRST_CHUNK_TREE_OBJECTID,
|
|
cur, len);
|
|
if (ret < 0)
|
|
break;
|
|
cur += len;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Init the temp btrfs to a operational status.
|
|
*
|
|
* It will fix the extent usage accounting(XXX: Do we really need?) and
|
|
* insert needed data chunks, to ensure all old fs data extents are covered
|
|
* by DATA chunks, preventing wrong chunks are allocated.
|
|
*
|
|
* And also create convert image subvolume and relocation tree.
|
|
* (XXX: Not need again?)
|
|
* But the convert image subvolume is *NOT* linked to fs tree yet.
|
|
*/
|
|
static int init_btrfs(struct btrfs_mkfs_config *cfg, struct btrfs_root *root,
|
|
struct btrfs_convert_context *cctx, int datacsum,
|
|
int packing, int noxattr)
|
|
{
|
|
struct btrfs_key location;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int ret;
|
|
|
|
/*
|
|
* Don't alloc any metadata/system chunk, as we don't want
|
|
* any meta/sys chunk allcated before all data chunks are inserted.
|
|
* Or we screw up the chunk layout just like the old implement.
|
|
*/
|
|
fs_info->avoid_sys_chunk_alloc = 1;
|
|
fs_info->avoid_meta_chunk_alloc = 1;
|
|
trans = btrfs_start_transaction(root, 1);
|
|
BUG_ON(!trans);
|
|
ret = btrfs_fix_block_accounting(trans, root);
|
|
if (ret)
|
|
goto err;
|
|
ret = make_convert_data_block_groups(trans, fs_info, cfg, cctx);
|
|
if (ret)
|
|
goto err;
|
|
ret = btrfs_make_root_dir(trans, fs_info->tree_root,
|
|
BTRFS_ROOT_TREE_DIR_OBJECTID);
|
|
if (ret)
|
|
goto err;
|
|
memcpy(&location, &root->root_key, sizeof(location));
|
|
location.offset = (u64)-1;
|
|
ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7,
|
|
btrfs_super_root_dir(fs_info->super_copy),
|
|
&location, BTRFS_FT_DIR, 0);
|
|
if (ret)
|
|
goto err;
|
|
ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7,
|
|
location.objectid,
|
|
btrfs_super_root_dir(fs_info->super_copy), 0);
|
|
if (ret)
|
|
goto err;
|
|
btrfs_set_root_dirid(&fs_info->fs_root->root_item,
|
|
BTRFS_FIRST_FREE_OBJECTID);
|
|
|
|
/* subvol for fs image file */
|
|
ret = create_subvol(trans, root, CONV_IMAGE_SUBVOL_OBJECTID);
|
|
if (ret < 0)
|
|
goto err;
|
|
/* subvol for data relocation tree */
|
|
ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
ret = btrfs_commit_transaction(trans, root);
|
|
fs_info->avoid_sys_chunk_alloc = 0;
|
|
fs_info->avoid_meta_chunk_alloc = 0;
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Migrate super block to its default position and zero 0 ~ 16k
|
|
*/
|
|
static int migrate_super_block(int fd, u64 old_bytenr, u32 sectorsize)
|
|
{
|
|
int ret;
|
|
struct extent_buffer *buf;
|
|
struct btrfs_super_block *super;
|
|
u32 len;
|
|
u32 bytenr;
|
|
|
|
BUG_ON(sectorsize < sizeof(*super));
|
|
buf = malloc(sizeof(*buf) + sectorsize);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
buf->len = sectorsize;
|
|
ret = pread(fd, buf->data, sectorsize, old_bytenr);
|
|
if (ret != sectorsize)
|
|
goto fail;
|
|
|
|
super = (struct btrfs_super_block *)buf->data;
|
|
BUG_ON(btrfs_super_bytenr(super) != old_bytenr);
|
|
btrfs_set_super_bytenr(super, BTRFS_SUPER_INFO_OFFSET);
|
|
|
|
csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
|
|
ret = pwrite(fd, buf->data, sectorsize, BTRFS_SUPER_INFO_OFFSET);
|
|
if (ret != sectorsize)
|
|
goto fail;
|
|
|
|
ret = fsync(fd);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
memset(buf->data, 0, sectorsize);
|
|
for (bytenr = 0; bytenr < BTRFS_SUPER_INFO_OFFSET; ) {
|
|
len = BTRFS_SUPER_INFO_OFFSET - bytenr;
|
|
if (len > sectorsize)
|
|
len = sectorsize;
|
|
ret = pwrite(fd, buf->data, len, bytenr);
|
|
if (ret != len) {
|
|
fprintf(stderr, "unable to zero fill device\n");
|
|
break;
|
|
}
|
|
bytenr += len;
|
|
}
|
|
ret = 0;
|
|
fsync(fd);
|
|
fail:
|
|
free(buf);
|
|
if (ret > 0)
|
|
ret = -1;
|
|
return ret;
|
|
}
|
|
|
|
static int prepare_system_chunk_sb(struct btrfs_super_block *super)
|
|
{
|
|
struct btrfs_chunk *chunk;
|
|
struct btrfs_disk_key *key;
|
|
u32 sectorsize = btrfs_super_sectorsize(super);
|
|
|
|
key = (struct btrfs_disk_key *)(super->sys_chunk_array);
|
|
chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
|
|
sizeof(struct btrfs_disk_key));
|
|
|
|
btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
|
|
btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
|
|
btrfs_set_disk_key_offset(key, 0);
|
|
|
|
btrfs_set_stack_chunk_length(chunk, btrfs_super_total_bytes(super));
|
|
btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
|
|
btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN);
|
|
btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
|
|
btrfs_set_stack_chunk_io_align(chunk, sectorsize);
|
|
btrfs_set_stack_chunk_io_width(chunk, sectorsize);
|
|
btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
|
|
btrfs_set_stack_chunk_num_stripes(chunk, 1);
|
|
btrfs_set_stack_chunk_sub_stripes(chunk, 0);
|
|
chunk->stripe.devid = super->dev_item.devid;
|
|
btrfs_set_stack_stripe_offset(&chunk->stripe, 0);
|
|
memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
|
|
btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
|
|
return 0;
|
|
}
|
|
|
|
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,
|
|
};
|
|
|
|
static const struct btrfs_convert_operations *convert_operations[] = {
|
|
&ext2_convert_ops,
|
|
};
|
|
|
|
static int convert_open_fs(const char *devname,
|
|
struct btrfs_convert_context *cctx)
|
|
{
|
|
int i;
|
|
|
|
memset(cctx, 0, sizeof(*cctx));
|
|
|
|
for (i = 0; i < ARRAY_SIZE(convert_operations); i++) {
|
|
int ret = convert_operations[i]->open_fs(cctx, devname);
|
|
|
|
if (ret == 0) {
|
|
cctx->convert_ops = convert_operations[i];
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
fprintf(stderr, "No file system found to convert.\n");
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Helper for expand and merge extent_cache for wipe_one_reserved_range() to
|
|
* handle wiping a range that exists in cache.
|
|
*/
|
|
static int _expand_extent_cache(struct cache_tree *tree,
|
|
struct cache_extent *entry,
|
|
u64 min_stripe_size, int backward)
|
|
{
|
|
struct cache_extent *ce;
|
|
int diff;
|
|
|
|
if (entry->size >= min_stripe_size)
|
|
return 0;
|
|
diff = min_stripe_size - entry->size;
|
|
|
|
if (backward) {
|
|
ce = prev_cache_extent(entry);
|
|
if (!ce)
|
|
goto expand_back;
|
|
if (ce->start + ce->size >= entry->start - diff) {
|
|
/* Directly merge with previous extent */
|
|
ce->size = entry->start + entry->size - ce->start;
|
|
remove_cache_extent(tree, entry);
|
|
free(entry);
|
|
return 0;
|
|
}
|
|
expand_back:
|
|
/* No overlap, normal extent */
|
|
if (entry->start < diff) {
|
|
error("cannot find space for data chunk layout");
|
|
return -ENOSPC;
|
|
}
|
|
entry->start -= diff;
|
|
entry->size += diff;
|
|
return 0;
|
|
}
|
|
ce = next_cache_extent(entry);
|
|
if (!ce)
|
|
goto expand_after;
|
|
if (entry->start + entry->size + diff >= ce->start) {
|
|
/* Directly merge with next extent */
|
|
entry->size = ce->start + ce->size - entry->start;
|
|
remove_cache_extent(tree, ce);
|
|
free(ce);
|
|
return 0;
|
|
}
|
|
expand_after:
|
|
entry->size += diff;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Remove one reserve range from given cache tree
|
|
* if min_stripe_size is non-zero, it will ensure for split case,
|
|
* all its split cache extent is no smaller than @min_strip_size / 2.
|
|
*/
|
|
static int wipe_one_reserved_range(struct cache_tree *tree,
|
|
u64 start, u64 len, u64 min_stripe_size,
|
|
int ensure_size)
|
|
{
|
|
struct cache_extent *cache;
|
|
int ret;
|
|
|
|
BUG_ON(ensure_size && min_stripe_size == 0);
|
|
/*
|
|
* The logical here is simplified to handle special cases only
|
|
* So we don't need to consider merge case for ensure_size
|
|
*/
|
|
BUG_ON(min_stripe_size && (min_stripe_size < len * 2 ||
|
|
min_stripe_size / 2 < BTRFS_STRIPE_LEN));
|
|
|
|
/* Also, wipe range should already be aligned */
|
|
BUG_ON(start != round_down(start, BTRFS_STRIPE_LEN) ||
|
|
start + len != round_up(start + len, BTRFS_STRIPE_LEN));
|
|
|
|
min_stripe_size /= 2;
|
|
|
|
cache = lookup_cache_extent(tree, start, len);
|
|
if (!cache)
|
|
return 0;
|
|
|
|
if (start <= cache->start) {
|
|
/*
|
|
* |--------cache---------|
|
|
* |-wipe-|
|
|
*/
|
|
BUG_ON(start + len <= cache->start);
|
|
|
|
/*
|
|
* The wipe size is smaller than min_stripe_size / 2,
|
|
* so the result length should still meet min_stripe_size
|
|
* And no need to do alignment
|
|
*/
|
|
cache->size -= (start + len - cache->start);
|
|
if (cache->size == 0) {
|
|
remove_cache_extent(tree, cache);
|
|
free(cache);
|
|
return 0;
|
|
}
|
|
|
|
BUG_ON(ensure_size && cache->size < min_stripe_size);
|
|
|
|
cache->start = start + len;
|
|
return 0;
|
|
} else if (start > cache->start && start + len < cache->start +
|
|
cache->size) {
|
|
/*
|
|
* |-------cache-----|
|
|
* |-wipe-|
|
|
*/
|
|
u64 old_start = cache->start;
|
|
u64 old_len = cache->size;
|
|
u64 insert_start = start + len;
|
|
u64 insert_len;
|
|
|
|
cache->size = start - cache->start;
|
|
/* Expand the leading half part if needed */
|
|
if (ensure_size && cache->size < min_stripe_size) {
|
|
ret = _expand_extent_cache(tree, cache,
|
|
min_stripe_size, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
/* And insert the new one */
|
|
insert_len = old_start + old_len - start - len;
|
|
ret = add_merge_cache_extent(tree, insert_start, insert_len);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Expand the last half part if needed */
|
|
if (ensure_size && insert_len < min_stripe_size) {
|
|
cache = lookup_cache_extent(tree, insert_start,
|
|
insert_len);
|
|
if (!cache || cache->start != insert_start ||
|
|
cache->size != insert_len)
|
|
return -ENOENT;
|
|
ret = _expand_extent_cache(tree, cache,
|
|
min_stripe_size, 0);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
/*
|
|
* |----cache-----|
|
|
* |--wipe-|
|
|
* Wipe len should be small enough and no need to expand the
|
|
* remaining extent
|
|
*/
|
|
cache->size = start - cache->start;
|
|
BUG_ON(ensure_size && cache->size < min_stripe_size);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Remove reserved ranges from given cache_tree
|
|
*
|
|
* It will remove the following ranges
|
|
* 1) 0~1M
|
|
* 2) 2nd superblock, +64K (make sure chunks are 64K aligned)
|
|
* 3) 3rd superblock, +64K
|
|
*
|
|
* @min_stripe must be given for safety check
|
|
* and if @ensure_size is given, it will ensure affected cache_extent will be
|
|
* larger than min_stripe_size
|
|
*/
|
|
static int wipe_reserved_ranges(struct cache_tree *tree, u64 min_stripe_size,
|
|
int ensure_size)
|
|
{
|
|
int ret;
|
|
|
|
ret = wipe_one_reserved_range(tree, 0, 1024 * 1024, min_stripe_size,
|
|
ensure_size);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = wipe_one_reserved_range(tree, btrfs_sb_offset(1),
|
|
BTRFS_STRIPE_LEN, min_stripe_size, ensure_size);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = wipe_one_reserved_range(tree, btrfs_sb_offset(2),
|
|
BTRFS_STRIPE_LEN, min_stripe_size, ensure_size);
|
|
return ret;
|
|
}
|
|
|
|
static int calculate_available_space(struct btrfs_convert_context *cctx)
|
|
{
|
|
struct cache_tree *used = &cctx->used;
|
|
struct cache_tree *data_chunks = &cctx->data_chunks;
|
|
struct cache_tree *free = &cctx->free;
|
|
struct cache_extent *cache;
|
|
u64 cur_off = 0;
|
|
/*
|
|
* Twice the minimal chunk size, to allow later wipe_reserved_ranges()
|
|
* works without need to consider overlap
|
|
*/
|
|
u64 min_stripe_size = 2 * 16 * 1024 * 1024;
|
|
int ret;
|
|
|
|
/* Calculate data_chunks */
|
|
for (cache = first_cache_extent(used); cache;
|
|
cache = next_cache_extent(cache)) {
|
|
u64 cur_len;
|
|
|
|
if (cache->start + cache->size < cur_off)
|
|
continue;
|
|
if (cache->start > cur_off + min_stripe_size)
|
|
cur_off = cache->start;
|
|
cur_len = max(cache->start + cache->size - cur_off,
|
|
min_stripe_size);
|
|
ret = add_merge_cache_extent(data_chunks, cur_off, cur_len);
|
|
if (ret < 0)
|
|
goto out;
|
|
cur_off += cur_len;
|
|
}
|
|
/*
|
|
* remove reserved ranges, so we won't ever bother relocating an old
|
|
* filesystem extent to other place.
|
|
*/
|
|
ret = wipe_reserved_ranges(data_chunks, min_stripe_size, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
cur_off = 0;
|
|
/*
|
|
* Calculate free space
|
|
* Always round up the start bytenr, to avoid metadata extent corss
|
|
* stripe boundary, as later mkfs_convert() won't have all the extent
|
|
* allocation check
|
|
*/
|
|
for (cache = first_cache_extent(data_chunks); cache;
|
|
cache = next_cache_extent(cache)) {
|
|
if (cache->start < cur_off)
|
|
continue;
|
|
if (cache->start > cur_off) {
|
|
u64 insert_start;
|
|
u64 len;
|
|
|
|
len = cache->start - round_up(cur_off,
|
|
BTRFS_STRIPE_LEN);
|
|
insert_start = round_up(cur_off, BTRFS_STRIPE_LEN);
|
|
|
|
ret = add_merge_cache_extent(free, insert_start, len);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
cur_off = cache->start + cache->size;
|
|
}
|
|
/* Don't forget the last range */
|
|
if (cctx->total_bytes > cur_off) {
|
|
u64 len = cctx->total_bytes - cur_off;
|
|
u64 insert_start;
|
|
|
|
insert_start = round_up(cur_off, BTRFS_STRIPE_LEN);
|
|
|
|
ret = add_merge_cache_extent(free, insert_start, len);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
/* Remove reserved bytes */
|
|
ret = wipe_reserved_ranges(free, min_stripe_size, 0);
|
|
out:
|
|
return ret;
|
|
}
|
|
/*
|
|
* Read used space, and since we have the used space,
|
|
* calcuate data_chunks and free for later mkfs
|
|
*/
|
|
static int convert_read_used_space(struct btrfs_convert_context *cctx)
|
|
{
|
|
int ret;
|
|
|
|
ret = cctx->convert_ops->read_used_space(cctx);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = calculate_available_space(cctx);
|
|
return ret;
|
|
}
|
|
|
|
static int do_convert(const char *devname, int datacsum, int packing,
|
|
int noxattr, u32 nodesize, int copylabel, const char *fslabel,
|
|
int progress, u64 features)
|
|
{
|
|
int ret;
|
|
int fd = -1;
|
|
int is_btrfs = 0;
|
|
u32 blocksize;
|
|
u64 total_bytes;
|
|
struct btrfs_root *root;
|
|
struct btrfs_root *image_root;
|
|
struct btrfs_convert_context cctx;
|
|
struct btrfs_key key;
|
|
char *subvol_name = NULL;
|
|
struct task_ctx ctx;
|
|
char features_buf[64];
|
|
struct btrfs_mkfs_config mkfs_cfg;
|
|
|
|
init_convert_context(&cctx);
|
|
ret = convert_open_fs(devname, &cctx);
|
|
if (ret)
|
|
goto fail;
|
|
ret = convert_read_used_space(&cctx);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
blocksize = cctx.blocksize;
|
|
total_bytes = (u64)blocksize * (u64)cctx.block_count;
|
|
if (blocksize < 4096) {
|
|
fprintf(stderr, "block size is too small\n");
|
|
goto fail;
|
|
}
|
|
if (btrfs_check_nodesize(nodesize, blocksize, features))
|
|
goto fail;
|
|
fd = open(devname, O_RDWR);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "unable to open %s\n", devname);
|
|
goto fail;
|
|
}
|
|
btrfs_parse_features_to_string(features_buf, features);
|
|
if (features == BTRFS_MKFS_DEFAULT_FEATURES)
|
|
strcat(features_buf, " (default)");
|
|
|
|
printf("create btrfs filesystem:\n");
|
|
printf("\tblocksize: %u\n", blocksize);
|
|
printf("\tnodesize: %u\n", nodesize);
|
|
printf("\tfeatures: %s\n", features_buf);
|
|
|
|
mkfs_cfg.label = cctx.volume_name;
|
|
mkfs_cfg.num_bytes = total_bytes;
|
|
mkfs_cfg.nodesize = nodesize;
|
|
mkfs_cfg.sectorsize = blocksize;
|
|
mkfs_cfg.stripesize = blocksize;
|
|
mkfs_cfg.features = features;
|
|
/* New convert need these space */
|
|
mkfs_cfg.fs_uuid = malloc(BTRFS_UUID_UNPARSED_SIZE);
|
|
mkfs_cfg.chunk_uuid = malloc(BTRFS_UUID_UNPARSED_SIZE);
|
|
*(mkfs_cfg.fs_uuid) = '\0';
|
|
*(mkfs_cfg.chunk_uuid) = '\0';
|
|
|
|
ret = make_btrfs(fd, &mkfs_cfg, &cctx);
|
|
if (ret) {
|
|
fprintf(stderr, "unable to create initial ctree: %s\n",
|
|
strerror(-ret));
|
|
goto fail;
|
|
}
|
|
|
|
root = open_ctree_fd(fd, devname, mkfs_cfg.super_bytenr,
|
|
OPEN_CTREE_WRITES);
|
|
if (!root) {
|
|
fprintf(stderr, "unable to open ctree\n");
|
|
goto fail;
|
|
}
|
|
ret = init_btrfs(&mkfs_cfg, root, &cctx, datacsum, packing, noxattr);
|
|
if (ret) {
|
|
fprintf(stderr, "unable to setup the root tree\n");
|
|
goto fail;
|
|
}
|
|
|
|
printf("creating %s image file.\n", cctx.convert_ops->name);
|
|
ret = asprintf(&subvol_name, "%s_saved", cctx.convert_ops->name);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "error allocating subvolume name: %s_saved\n",
|
|
cctx.convert_ops->name);
|
|
goto fail;
|
|
}
|
|
key.objectid = CONV_IMAGE_SUBVOL_OBJECTID;
|
|
key.offset = (u64)-1;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
image_root = btrfs_read_fs_root(root->fs_info, &key);
|
|
if (!image_root) {
|
|
fprintf(stderr, "unable to create subvol\n");
|
|
goto fail;
|
|
}
|
|
ret = create_image(image_root, &mkfs_cfg, &cctx, fd,
|
|
mkfs_cfg.num_bytes, "image", datacsum);
|
|
if (ret) {
|
|
fprintf(stderr, "error during create_image %d\n", ret);
|
|
goto fail;
|
|
}
|
|
|
|
printf("creating btrfs metadata.\n");
|
|
ctx.max_copy_inodes = (cctx.inodes_count - cctx.free_inodes_count);
|
|
ctx.cur_copy_inodes = 0;
|
|
|
|
if (progress) {
|
|
ctx.info = task_init(print_copied_inodes, after_copied_inodes,
|
|
&ctx);
|
|
task_start(ctx.info);
|
|
}
|
|
ret = copy_inodes(&cctx, root, datacsum, packing, noxattr, &ctx);
|
|
if (ret) {
|
|
fprintf(stderr, "error during copy_inodes %d\n", ret);
|
|
goto fail;
|
|
}
|
|
if (progress) {
|
|
task_stop(ctx.info);
|
|
task_deinit(ctx.info);
|
|
}
|
|
|
|
image_root = link_subvol(root, subvol_name, CONV_IMAGE_SUBVOL_OBJECTID);
|
|
|
|
free(subvol_name);
|
|
|
|
memset(root->fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
|
|
if (copylabel == 1) {
|
|
__strncpy_null(root->fs_info->super_copy->label,
|
|
cctx.volume_name, BTRFS_LABEL_SIZE - 1);
|
|
fprintf(stderr, "copy label '%s'\n",
|
|
root->fs_info->super_copy->label);
|
|
} else if (copylabel == -1) {
|
|
strcpy(root->fs_info->super_copy->label, fslabel);
|
|
fprintf(stderr, "set label to '%s'\n", fslabel);
|
|
}
|
|
|
|
ret = close_ctree(root);
|
|
if (ret) {
|
|
fprintf(stderr, "error during close_ctree %d\n", ret);
|
|
goto fail;
|
|
}
|
|
convert_close_fs(&cctx);
|
|
clean_convert_context(&cctx);
|
|
|
|
/*
|
|
* If this step succeed, we get a mountable btrfs. Otherwise
|
|
* the source fs is left unchanged.
|
|
*/
|
|
ret = migrate_super_block(fd, mkfs_cfg.super_bytenr, blocksize);
|
|
if (ret) {
|
|
fprintf(stderr, "unable to migrate super block\n");
|
|
goto fail;
|
|
}
|
|
is_btrfs = 1;
|
|
|
|
root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
|
|
if (!root) {
|
|
fprintf(stderr, "unable to open ctree\n");
|
|
goto fail;
|
|
}
|
|
close(fd);
|
|
|
|
printf("conversion complete.\n");
|
|
return 0;
|
|
fail:
|
|
clean_convert_context(&cctx);
|
|
if (fd != -1)
|
|
close(fd);
|
|
if (is_btrfs)
|
|
fprintf(stderr,
|
|
"WARNING: an error occurred during chunk mapping fixup, filesystem mountable but not finalized\n");
|
|
else
|
|
fprintf(stderr, "conversion aborted\n");
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Check if a non 1:1 mapped chunk can be rolled back.
|
|
* For new convert, it's OK while for old convert it's not.
|
|
*/
|
|
static int may_rollback_chunk(struct btrfs_fs_info *fs_info, u64 bytenr)
|
|
{
|
|
struct btrfs_block_group_cache *bg;
|
|
struct btrfs_key key;
|
|
struct btrfs_path path;
|
|
struct btrfs_root *extent_root = fs_info->extent_root;
|
|
u64 bg_start;
|
|
u64 bg_end;
|
|
int ret;
|
|
|
|
bg = btrfs_lookup_first_block_group(fs_info, bytenr);
|
|
if (!bg)
|
|
return -ENOENT;
|
|
bg_start = bg->key.objectid;
|
|
bg_end = bg->key.objectid + bg->key.offset;
|
|
|
|
key.objectid = bg_end;
|
|
key.type = BTRFS_METADATA_ITEM_KEY;
|
|
key.offset = 0;
|
|
btrfs_init_path(&path);
|
|
|
|
ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
while (1) {
|
|
struct btrfs_extent_item *ei;
|
|
|
|
ret = btrfs_previous_extent_item(extent_root, &path, bg_start);
|
|
if (ret > 0) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
if (ret < 0)
|
|
break;
|
|
|
|
btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
|
|
if (key.type == BTRFS_METADATA_ITEM_KEY)
|
|
continue;
|
|
/* Now it's EXTENT_ITEM_KEY only */
|
|
ei = btrfs_item_ptr(path.nodes[0], path.slots[0],
|
|
struct btrfs_extent_item);
|
|
/*
|
|
* Found data extent, means this is old convert must follow 1:1
|
|
* mapping.
|
|
*/
|
|
if (btrfs_extent_flags(path.nodes[0], ei)
|
|
& BTRFS_EXTENT_FLAG_DATA) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
btrfs_release_path(&path);
|
|
return ret;
|
|
}
|
|
|
|
static int may_rollback(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *info = root->fs_info;
|
|
struct btrfs_multi_bio *multi = NULL;
|
|
u64 bytenr;
|
|
u64 length;
|
|
u64 physical;
|
|
u64 total_bytes;
|
|
int num_stripes;
|
|
int ret;
|
|
|
|
if (btrfs_super_num_devices(info->super_copy) != 1)
|
|
goto fail;
|
|
|
|
bytenr = BTRFS_SUPER_INFO_OFFSET;
|
|
total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
|
|
|
|
while (1) {
|
|
ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr,
|
|
&length, &multi, 0, NULL);
|
|
if (ret) {
|
|
if (ret == -ENOENT) {
|
|
/* removed block group at the tail */
|
|
if (length == (u64)-1)
|
|
break;
|
|
|
|
/* removed block group in the middle */
|
|
goto next;
|
|
}
|
|
goto fail;
|
|
}
|
|
|
|
num_stripes = multi->num_stripes;
|
|
physical = multi->stripes[0].physical;
|
|
kfree(multi);
|
|
|
|
if (num_stripes != 1) {
|
|
error("num stripes for bytenr %llu is not 1", bytenr);
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* Extra check for new convert, as metadata chunk from new
|
|
* convert is much more free than old convert, it doesn't need
|
|
* to do 1:1 mapping.
|
|
*/
|
|
if (physical != bytenr) {
|
|
/*
|
|
* Check if it's a metadata chunk and has only metadata
|
|
* extent.
|
|
*/
|
|
ret = may_rollback_chunk(info, bytenr);
|
|
if (ret < 0)
|
|
goto fail;
|
|
}
|
|
next:
|
|
bytenr += length;
|
|
if (bytenr >= total_bytes)
|
|
break;
|
|
}
|
|
return 0;
|
|
fail:
|
|
return -1;
|
|
}
|
|
|
|
static int do_rollback(const char *devname)
|
|
{
|
|
int fd = -1;
|
|
int ret;
|
|
int i;
|
|
struct btrfs_root *root;
|
|
struct btrfs_root *image_root;
|
|
struct btrfs_root *chunk_root;
|
|
struct btrfs_dir_item *dir;
|
|
struct btrfs_inode_item *inode;
|
|
struct btrfs_file_extent_item *fi;
|
|
struct btrfs_trans_handle *trans;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_block_group_cache *cache1;
|
|
struct btrfs_block_group_cache *cache2;
|
|
struct btrfs_key key;
|
|
struct btrfs_path path;
|
|
struct extent_io_tree io_tree;
|
|
char *buf = NULL;
|
|
char *name;
|
|
u64 bytenr;
|
|
u64 num_bytes;
|
|
u64 root_dir;
|
|
u64 objectid;
|
|
u64 offset;
|
|
u64 start;
|
|
u64 end;
|
|
u64 sb_bytenr;
|
|
u64 first_free;
|
|
u64 total_bytes;
|
|
u32 sectorsize;
|
|
|
|
extent_io_tree_init(&io_tree);
|
|
|
|
fd = open(devname, O_RDWR);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "unable to open %s\n", devname);
|
|
goto fail;
|
|
}
|
|
root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
|
|
if (!root) {
|
|
fprintf(stderr, "unable to open ctree\n");
|
|
goto fail;
|
|
}
|
|
ret = may_rollback(root);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "unable to do rollback\n");
|
|
goto fail;
|
|
}
|
|
|
|
sectorsize = root->sectorsize;
|
|
buf = malloc(sectorsize);
|
|
if (!buf) {
|
|
fprintf(stderr, "unable to allocate memory\n");
|
|
goto fail;
|
|
}
|
|
|
|
btrfs_init_path(&path);
|
|
|
|
key.objectid = CONV_IMAGE_SUBVOL_OBJECTID;
|
|
key.type = BTRFS_ROOT_BACKREF_KEY;
|
|
key.offset = BTRFS_FS_TREE_OBJECTID;
|
|
ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, &path, 0,
|
|
0);
|
|
btrfs_release_path(&path);
|
|
if (ret > 0) {
|
|
fprintf(stderr,
|
|
"ERROR: unable to convert ext2 image subvolume, is it deleted?\n");
|
|
goto fail;
|
|
} else if (ret < 0) {
|
|
fprintf(stderr,
|
|
"ERROR: unable to open ext2_saved, id=%llu: %s\n",
|
|
(unsigned long long)key.objectid, strerror(-ret));
|
|
goto fail;
|
|
}
|
|
|
|
key.objectid = CONV_IMAGE_SUBVOL_OBJECTID;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
image_root = btrfs_read_fs_root(root->fs_info, &key);
|
|
if (!image_root || IS_ERR(image_root)) {
|
|
fprintf(stderr, "unable to open subvol %llu\n",
|
|
(unsigned long long)key.objectid);
|
|
goto fail;
|
|
}
|
|
|
|
name = "image";
|
|
root_dir = btrfs_root_dirid(&root->root_item);
|
|
dir = btrfs_lookup_dir_item(NULL, image_root, &path,
|
|
root_dir, name, strlen(name), 0);
|
|
if (!dir || IS_ERR(dir)) {
|
|
fprintf(stderr, "unable to find file %s\n", name);
|
|
goto fail;
|
|
}
|
|
leaf = path.nodes[0];
|
|
btrfs_dir_item_key_to_cpu(leaf, dir, &key);
|
|
btrfs_release_path(&path);
|
|
|
|
objectid = key.objectid;
|
|
|
|
ret = btrfs_lookup_inode(NULL, image_root, &path, &key, 0);
|
|
if (ret) {
|
|
fprintf(stderr, "unable to find inode item\n");
|
|
goto fail;
|
|
}
|
|
leaf = path.nodes[0];
|
|
inode = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item);
|
|
total_bytes = btrfs_inode_size(leaf, inode);
|
|
btrfs_release_path(&path);
|
|
|
|
key.objectid = objectid;
|
|
key.offset = 0;
|
|
btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
|
|
ret = btrfs_search_slot(NULL, image_root, &key, &path, 0, 0);
|
|
if (ret != 0) {
|
|
fprintf(stderr, "unable to find first file extent\n");
|
|
btrfs_release_path(&path);
|
|
goto fail;
|
|
}
|
|
|
|
/* build mapping tree for the relocated blocks */
|
|
for (offset = 0; offset < total_bytes; ) {
|
|
leaf = path.nodes[0];
|
|
if (path.slots[0] >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, &path);
|
|
if (ret != 0)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
|
|
if (key.objectid != objectid || key.offset != offset ||
|
|
btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
|
|
break;
|
|
|
|
fi = btrfs_item_ptr(leaf, path.slots[0],
|
|
struct btrfs_file_extent_item);
|
|
if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
|
|
break;
|
|
if (btrfs_file_extent_compression(leaf, fi) ||
|
|
btrfs_file_extent_encryption(leaf, fi) ||
|
|
btrfs_file_extent_other_encoding(leaf, fi))
|
|
break;
|
|
|
|
bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
|
|
/* skip holes and direct mapped extents */
|
|
if (bytenr == 0 || bytenr == offset)
|
|
goto next_extent;
|
|
|
|
bytenr += btrfs_file_extent_offset(leaf, fi);
|
|
num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
|
|
|
|
cache1 = btrfs_lookup_block_group(root->fs_info, offset);
|
|
cache2 = btrfs_lookup_block_group(root->fs_info,
|
|
offset + num_bytes - 1);
|
|
/*
|
|
* Here we must take consideration of old and new convert
|
|
* behavior.
|
|
* For old convert case, sign, there is no consist chunk type
|
|
* that will cover the extent. META/DATA/SYS are all possible.
|
|
* Just ensure relocate one is in SYS chunk.
|
|
* For new convert case, they are all covered by DATA chunk.
|
|
*
|
|
* So, there is not valid chunk type check for it now.
|
|
*/
|
|
if (cache1 != cache2)
|
|
break;
|
|
|
|
set_extent_bits(&io_tree, offset, offset + num_bytes - 1,
|
|
EXTENT_LOCKED, GFP_NOFS);
|
|
set_state_private(&io_tree, offset, bytenr);
|
|
next_extent:
|
|
offset += btrfs_file_extent_num_bytes(leaf, fi);
|
|
path.slots[0]++;
|
|
}
|
|
btrfs_release_path(&path);
|
|
|
|
if (offset < total_bytes) {
|
|
fprintf(stderr, "unable to build extent mapping\n");
|
|
fprintf(stderr, "converted filesystem after balance is unable to rollback\n");
|
|
goto fail;
|
|
}
|
|
|
|
first_free = BTRFS_SUPER_INFO_OFFSET + 2 * sectorsize - 1;
|
|
first_free &= ~((u64)sectorsize - 1);
|
|
/* backup for extent #0 should exist */
|
|
if(!test_range_bit(&io_tree, 0, first_free - 1, EXTENT_LOCKED, 1)) {
|
|
fprintf(stderr, "no backup for the first extent\n");
|
|
goto fail;
|
|
}
|
|
/* force no allocation from system block group */
|
|
root->fs_info->system_allocs = -1;
|
|
trans = btrfs_start_transaction(root, 1);
|
|
BUG_ON(!trans);
|
|
/*
|
|
* recow the whole chunk tree, this will remove all chunk tree blocks
|
|
* from system block group
|
|
*/
|
|
chunk_root = root->fs_info->chunk_root;
|
|
memset(&key, 0, sizeof(key));
|
|
while (1) {
|
|
ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
ret = btrfs_next_leaf(chunk_root, &path);
|
|
if (ret)
|
|
break;
|
|
|
|
btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
|
|
btrfs_release_path(&path);
|
|
}
|
|
btrfs_release_path(&path);
|
|
|
|
offset = 0;
|
|
num_bytes = 0;
|
|
while(1) {
|
|
cache1 = btrfs_lookup_block_group(root->fs_info, offset);
|
|
if (!cache1)
|
|
break;
|
|
|
|
if (cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM)
|
|
num_bytes += btrfs_block_group_used(&cache1->item);
|
|
|
|
offset = cache1->key.objectid + cache1->key.offset;
|
|
}
|
|
/* only extent #0 left in system block group? */
|
|
if (num_bytes > first_free) {
|
|
fprintf(stderr, "unable to empty system block group\n");
|
|
goto fail;
|
|
}
|
|
/* create a system chunk that maps the whole device */
|
|
ret = prepare_system_chunk_sb(root->fs_info->super_copy);
|
|
if (ret) {
|
|
fprintf(stderr, "unable to update system chunk\n");
|
|
goto fail;
|
|
}
|
|
|
|
ret = btrfs_commit_transaction(trans, root);
|
|
BUG_ON(ret);
|
|
|
|
ret = close_ctree(root);
|
|
if (ret) {
|
|
fprintf(stderr, "error during close_ctree %d\n", ret);
|
|
goto fail;
|
|
}
|
|
|
|
/* zero btrfs super block mirrors */
|
|
memset(buf, 0, sectorsize);
|
|
for (i = 1 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
|
|
bytenr = btrfs_sb_offset(i);
|
|
if (bytenr >= total_bytes)
|
|
break;
|
|
ret = pwrite(fd, buf, sectorsize, bytenr);
|
|
if (ret != sectorsize) {
|
|
fprintf(stderr,
|
|
"error during zeroing superblock %d: %d\n",
|
|
i, ret);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
sb_bytenr = (u64)-1;
|
|
/* copy all relocated blocks back */
|
|
while(1) {
|
|
ret = find_first_extent_bit(&io_tree, 0, &start, &end,
|
|
EXTENT_LOCKED);
|
|
if (ret)
|
|
break;
|
|
|
|
ret = get_state_private(&io_tree, start, &bytenr);
|
|
BUG_ON(ret);
|
|
|
|
clear_extent_bits(&io_tree, start, end, EXTENT_LOCKED,
|
|
GFP_NOFS);
|
|
|
|
while (start <= end) {
|
|
if (start == BTRFS_SUPER_INFO_OFFSET) {
|
|
sb_bytenr = bytenr;
|
|
goto next_sector;
|
|
}
|
|
ret = pread(fd, buf, sectorsize, bytenr);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "error during pread %d\n", ret);
|
|
goto fail;
|
|
}
|
|
BUG_ON(ret != sectorsize);
|
|
ret = pwrite(fd, buf, sectorsize, start);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "error during pwrite %d\n", ret);
|
|
goto fail;
|
|
}
|
|
BUG_ON(ret != sectorsize);
|
|
next_sector:
|
|
start += sectorsize;
|
|
bytenr += sectorsize;
|
|
}
|
|
}
|
|
|
|
ret = fsync(fd);
|
|
if (ret) {
|
|
fprintf(stderr, "error during fsync %d\n", ret);
|
|
goto fail;
|
|
}
|
|
/*
|
|
* finally, overwrite btrfs super block.
|
|
*/
|
|
ret = pread(fd, buf, sectorsize, sb_bytenr);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "error during pread %d\n", ret);
|
|
goto fail;
|
|
}
|
|
BUG_ON(ret != sectorsize);
|
|
ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "error during pwrite %d\n", ret);
|
|
goto fail;
|
|
}
|
|
BUG_ON(ret != sectorsize);
|
|
ret = fsync(fd);
|
|
if (ret) {
|
|
fprintf(stderr, "error during fsync %d\n", ret);
|
|
goto fail;
|
|
}
|
|
|
|
close(fd);
|
|
free(buf);
|
|
extent_io_tree_cleanup(&io_tree);
|
|
printf("rollback complete.\n");
|
|
return 0;
|
|
|
|
fail:
|
|
if (fd != -1)
|
|
close(fd);
|
|
free(buf);
|
|
fprintf(stderr, "rollback aborted.\n");
|
|
return -1;
|
|
}
|
|
|
|
static void print_usage(void)
|
|
{
|
|
printf("usage: btrfs-convert [options] device\n");
|
|
printf("options:\n");
|
|
printf("\t-d|--no-datasum disable data checksum, sets NODATASUM\n");
|
|
printf("\t-i|--no-xattr ignore xattrs and ACLs\n");
|
|
printf("\t-n|--no-inline disable inlining of small files to metadata\n");
|
|
printf("\t-N|--nodesize SIZE set filesystem metadata nodesize\n");
|
|
printf("\t-r|--rollback roll back to the original filesystem\n");
|
|
printf("\t-l|--label LABEL set filesystem label\n");
|
|
printf("\t-L|--copy-label use label from converted filesystem\n");
|
|
printf("\t-p|--progress show converting progress (default)\n");
|
|
printf("\t-O|--features LIST comma separated list of filesystem features\n");
|
|
printf("\t--no-progress show only overview, not the detailed progress\n");
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int ret;
|
|
int packing = 1;
|
|
int noxattr = 0;
|
|
int datacsum = 1;
|
|
u32 nodesize = max_t(u32, sysconf(_SC_PAGESIZE),
|
|
BTRFS_MKFS_DEFAULT_NODE_SIZE);
|
|
int rollback = 0;
|
|
int copylabel = 0;
|
|
int usage_error = 0;
|
|
int progress = 1;
|
|
char *file;
|
|
char fslabel[BTRFS_LABEL_SIZE];
|
|
u64 features = BTRFS_MKFS_DEFAULT_FEATURES;
|
|
|
|
while(1) {
|
|
enum { GETOPT_VAL_NO_PROGRESS = 256 };
|
|
static const struct option long_options[] = {
|
|
{ "no-progress", no_argument, NULL,
|
|
GETOPT_VAL_NO_PROGRESS },
|
|
{ "no-datasum", no_argument, NULL, 'd' },
|
|
{ "no-inline", no_argument, NULL, 'n' },
|
|
{ "no-xattr", no_argument, NULL, 'i' },
|
|
{ "rollback", no_argument, NULL, 'r' },
|
|
{ "features", required_argument, NULL, 'O' },
|
|
{ "progress", no_argument, NULL, 'p' },
|
|
{ "label", required_argument, NULL, 'l' },
|
|
{ "copy-label", no_argument, NULL, 'L' },
|
|
{ "nodesize", required_argument, NULL, 'N' },
|
|
{ "help", no_argument, NULL, GETOPT_VAL_HELP},
|
|
{ NULL, 0, NULL, 0 }
|
|
};
|
|
int c = getopt_long(argc, argv, "dinN:rl:LpO:", long_options, NULL);
|
|
|
|
if (c < 0)
|
|
break;
|
|
switch(c) {
|
|
case 'd':
|
|
datacsum = 0;
|
|
break;
|
|
case 'i':
|
|
noxattr = 1;
|
|
break;
|
|
case 'n':
|
|
packing = 0;
|
|
break;
|
|
case 'N':
|
|
nodesize = parse_size(optarg);
|
|
break;
|
|
case 'r':
|
|
rollback = 1;
|
|
break;
|
|
case 'l':
|
|
copylabel = -1;
|
|
if (strlen(optarg) >= BTRFS_LABEL_SIZE) {
|
|
fprintf(stderr,
|
|
"WARNING: label too long, trimmed to %d bytes\n",
|
|
BTRFS_LABEL_SIZE - 1);
|
|
}
|
|
__strncpy_null(fslabel, optarg, BTRFS_LABEL_SIZE - 1);
|
|
break;
|
|
case 'L':
|
|
copylabel = 1;
|
|
break;
|
|
case 'p':
|
|
progress = 1;
|
|
break;
|
|
case 'O': {
|
|
char *orig = strdup(optarg);
|
|
char *tmp = orig;
|
|
|
|
tmp = btrfs_parse_fs_features(tmp, &features);
|
|
if (tmp) {
|
|
fprintf(stderr,
|
|
"Unrecognized filesystem feature '%s'\n",
|
|
tmp);
|
|
free(orig);
|
|
exit(1);
|
|
}
|
|
free(orig);
|
|
if (features & BTRFS_FEATURE_LIST_ALL) {
|
|
btrfs_list_all_fs_features(
|
|
~BTRFS_CONVERT_ALLOWED_FEATURES);
|
|
exit(0);
|
|
}
|
|
if (features & ~BTRFS_CONVERT_ALLOWED_FEATURES) {
|
|
char buf[64];
|
|
|
|
btrfs_parse_features_to_string(buf,
|
|
features & ~BTRFS_CONVERT_ALLOWED_FEATURES);
|
|
fprintf(stderr,
|
|
"ERROR: features not allowed for convert: %s\n",
|
|
buf);
|
|
exit(1);
|
|
}
|
|
|
|
break;
|
|
}
|
|
case GETOPT_VAL_NO_PROGRESS:
|
|
progress = 0;
|
|
break;
|
|
case GETOPT_VAL_HELP:
|
|
default:
|
|
print_usage();
|
|
return c != GETOPT_VAL_HELP;
|
|
}
|
|
}
|
|
set_argv0(argv);
|
|
if (check_argc_exact(argc - optind, 1)) {
|
|
print_usage();
|
|
return 1;
|
|
}
|
|
|
|
if (rollback && (!datacsum || noxattr || !packing)) {
|
|
fprintf(stderr,
|
|
"Usage error: -d, -i, -n options do not apply to rollback\n");
|
|
usage_error++;
|
|
}
|
|
|
|
if (usage_error) {
|
|
print_usage();
|
|
return 1;
|
|
}
|
|
|
|
file = argv[optind];
|
|
ret = check_mounted(file);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "Could not check mount status: %s\n",
|
|
strerror(-ret));
|
|
return 1;
|
|
} else if (ret) {
|
|
fprintf(stderr, "%s is mounted\n", file);
|
|
return 1;
|
|
}
|
|
|
|
if (rollback) {
|
|
ret = do_rollback(file);
|
|
} else {
|
|
ret = do_convert(file, datacsum, packing, noxattr, nodesize,
|
|
copylabel, fslabel, progress, features);
|
|
}
|
|
if (ret)
|
|
return 1;
|
|
return 0;
|
|
}
|