forked from Mirrors/btrfs-progs
Add rollback support for the converter
This patch adds rollback support for the converter, the converter can roll back a conversion if the image file haven't been modified. In addition, I rearrange some codes in convert.c and add a few comments.master
Yan
David Woodhouse
parent
b86a827172
commit
d1b729ac2b
511
convert.c
511
convert.c
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@ -33,6 +33,7 @@
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#include "ctree.h"
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#include "disk-io.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 "ext2fs/ext2_fs.h"
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#include "ext2fs/ext2fs.h"
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@ -43,7 +44,7 @@
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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 open_ext2fs(char *name, ext2_filsys *ret_fs)
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static int open_ext2fs(const char *name, ext2_filsys *ret_fs)
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{
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int mnt_flags;
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errcode_t ret;
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@ -87,10 +88,6 @@ static int close_ext2fs(ext2_filsys fs)
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ext2fs_close(fs);
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return 0;
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}
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/*
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* Stupid algorithm, search forward starting from the first free block.
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*/
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static int ext2_alloc_block(ext2_filsys fs, u64 goal, u64 *block_ret)
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{
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blk_t block;
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@ -115,6 +112,7 @@ static int custom_alloc_extent(struct btrfs_root *root, u64 num_bytes,
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{
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ext2_filsys fs = (ext2_filsys)root->fs_info->priv_data;
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u32 blocksize = fs->blocksize;
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u64 first = 0;
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u64 block;
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u64 bytenr;
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int ret;
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@ -126,6 +124,11 @@ static int custom_alloc_extent(struct btrfs_root *root, u64 num_bytes,
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ret = ext2_alloc_block(fs, block, &block);
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if (ret)
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return ret;
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/* all free blocks are pinned */
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if (first == block)
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return -ENOSPC;
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if (first == 0)
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first = block;
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bytenr = block * blocksize;
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if (!test_range_bit(&root->fs_info->pinned_extents, bytenr,
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@ -167,10 +170,9 @@ struct dir_iterate_data {
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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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u32 parent;
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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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@ -279,12 +281,10 @@ fail:
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ret = -1;
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return ret;
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}
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/*
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* record a single file extent. do all required works:
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* 1. insert a btrfs_file_extent_item into fs tree.
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* 2. compute checksum and insert btrfs_csum_item into fs tree.
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* 3. insert extent item and extent backref into extent tree.
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* Record a file extent. Do all the required works, such as inserting
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* file extent item, inserting extent item and backref item into extent
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* tree and updating block accounting.
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*/
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static int record_file_extent(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, u64 objectid,
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@ -446,8 +446,7 @@ static int __block_iterate_proc(ext2_filsys fs, blk_t *blocknr,
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static int create_file_extents(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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struct ext2_inode *ext2_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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char *buffer = NULL;
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@ -455,6 +454,7 @@ static int create_file_extents(struct btrfs_trans_handle *trans,
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u32 last_block;
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u32 sectorsize = root->sectorsize;
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u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
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u32 inode_flags = btrfs_stack_inode_flags(btrfs_inode);
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struct blk_iterate_data data = {
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.trans = trans,
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.root = root,
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@ -467,6 +467,8 @@ static int create_file_extents(struct btrfs_trans_handle *trans,
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.errcode = 0,
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};
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if (inode_flags & BTRFS_INODE_NODATASUM)
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data.checksum = 0;
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err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY,
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NULL, __block_iterate_proc, &data);
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if (err)
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@ -495,7 +497,7 @@ static int create_file_extents(struct btrfs_trans_handle *trans,
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} else if (data.num_blocks > 0) {
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ret = record_file_blocks(trans, root, objectid, btrfs_inode,
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data.first_block, data.disk_block,
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data.num_blocks, 1);
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data.num_blocks, data.checksum);
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if (ret)
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goto fail;
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}
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@ -504,7 +506,7 @@ static int create_file_extents(struct btrfs_trans_handle *trans,
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if (last_block > data.first_block) {
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ret = record_file_blocks(trans, root, objectid, btrfs_inode,
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data.first_block, 0, last_block -
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data.first_block, 1);
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data.first_block, data.checksum);
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}
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fail:
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if (buffer)
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@ -524,11 +526,10 @@ static int create_symbol_link(struct btrfs_trans_handle *trans,
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int ret;
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char *pathname;
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u64 inode_size = btrfs_stack_inode_size(btrfs_inode);
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if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) {
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btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1);
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ret = create_file_extents(trans, root, objectid, btrfs_inode,
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ext2_fs, ext2_ino, ext2_inode);
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ret = create_file_extents(trans, root, objectid,
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btrfs_inode, ext2_fs, ext2_ino);
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btrfs_set_stack_inode_size(btrfs_inode, inode_size);
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return ret;
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}
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@ -558,7 +559,7 @@ static inline dev_t new_decode_dev(u32 dev)
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static int copy_inode_item(struct btrfs_inode_item *dst,
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struct ext2_inode *src)
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{
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btrfs_set_stack_inode_generation(dst, 0);
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btrfs_set_stack_inode_generation(dst, 1);
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btrfs_set_stack_inode_size(dst, src->i_size);
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btrfs_set_stack_inode_nblocks(dst, src->i_blocks);
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btrfs_set_stack_inode_block_group(dst, 0);
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@ -602,7 +603,8 @@ static int copy_inode_item(struct btrfs_inode_item *dst,
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*/
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static int copy_single_inode(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, u64 objectid,
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ext2_filsys ext2_fs, ext2_ino_t ext2_ino)
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ext2_filsys ext2_fs, ext2_ino_t ext2_ino,
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int datacsum)
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{
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int ret;
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errcode_t err;
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@ -619,23 +621,26 @@ static int copy_single_inode(struct btrfs_trans_handle *trans,
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printf("skip inode %u\n", ext2_ino);
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return 0;
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}
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copy_inode_item(&btrfs_inode, &ext2_inode);
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if (!datacsum && S_ISREG(ext2_inode.i_mode)) {
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u32 flags = btrfs_stack_inode_flags(&btrfs_inode) |
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BTRFS_INODE_NODATASUM;
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btrfs_set_stack_inode_flags(&btrfs_inode, flags);
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}
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ret = 0;
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switch (ext2_inode.i_mode & S_IFMT) {
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case S_IFREG:
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ret = create_file_extents(trans, root, objectid, &btrfs_inode,
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ext2_fs, ext2_ino, &ext2_inode);
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ext2_fs, ext2_ino);
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break;
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case S_IFDIR:
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ret = create_dir_entries(trans, root, objectid, &btrfs_inode,
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ext2_fs, ext2_ino);
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break;
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case S_IFLNK:
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ret = create_symbol_link(trans, root, objectid, &btrfs_inode,
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ext2_fs, ext2_ino, &ext2_inode);
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break;
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case S_IFDIR:
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ret = create_dir_entries(trans, root, objectid,
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&btrfs_inode, ext2_fs, ext2_ino);
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break;
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default:
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ret = 0;
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break;
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@ -679,7 +684,8 @@ fail:
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/*
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* scan ext2's inode bitmap and copy all used inode.
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*/
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static int copy_inodes(struct btrfs_root *root, ext2_filsys ext2_fs)
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static int copy_inodes(struct btrfs_root *root, ext2_filsys ext2_fs,
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int datacsum)
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{
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int ret;
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ext2_ino_t ext2_ino;
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@ -699,7 +705,7 @@ static int copy_inodes(struct btrfs_root *root, ext2_filsys ext2_fs)
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continue;
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objectid = ext2_ino + INO_OFFSET;
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ret = copy_single_inode(trans, root, objectid,
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ext2_fs, ext2_ino);
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ext2_fs, ext2_ino, datacsum);
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if (ret)
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return ret;
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}
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@ -715,19 +721,17 @@ static int copy_inodes(struct btrfs_root *root, ext2_filsys ext2_fs)
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return ret;
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}
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static int lookup_extent_ref(struct btrfs_trans_handle *trans,
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static int lookup_extent_item(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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u64 bytenr, u64 num_bytes)
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{
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int ret;
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struct btrfs_key key;
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struct btrfs_path path;
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btrfs_init_path(&path);
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key.objectid = bytenr;
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key.type = BTRFS_EXTENT_ITEM_KEY;
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key.offset = num_bytes;
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btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
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ret = btrfs_search_slot(trans, root->fs_info->extent_root,
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&key, &path, 0, 0);
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btrfs_release_path(root, &path);
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@ -738,6 +742,9 @@ static int lookup_extent_ref(struct btrfs_trans_handle *trans,
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* Construct a range of ext2fs image file.
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* scan block allocation bitmap, find all blocks used by the ext2fs
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* in this range and create file extents that point to these blocks.
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*
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* Note: Before calling the function, no file extent points to blocks
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* in this range
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*/
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static int create_image_file_range(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, u64 objectid,
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@ -758,16 +765,15 @@ static int create_image_file_range(struct btrfs_trans_handle *trans,
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.first_block = block,
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.disk_block = block,
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.num_blocks = 0,
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.checksum = 1,
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.checksum = 0,
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.errcode = 0,
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};
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for (; start_byte < end_byte; block++, start_byte += blocksize) {
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if (!ext2fs_fast_test_block_bitmap(ext2_fs->block_map, block))
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continue;
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/* the bit may be set by us, check extent tree */
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bytenr = (u64)block * blocksize;
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ret = lookup_extent_ref(trans, root, bytenr, blocksize);
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ret = lookup_extent_item(trans, root, bytenr, blocksize);
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if (ret < 0)
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goto fail;
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if (ret == 0)
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@ -783,7 +789,7 @@ static int create_image_file_range(struct btrfs_trans_handle *trans,
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if (data.num_blocks > 0) {
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ret = record_file_blocks(trans, root, objectid, inode,
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data.first_block, data.disk_block,
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data.num_blocks, 1);
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data.num_blocks, 0);
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if (ret)
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return ret;
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data.first_block += data.num_blocks;
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@ -791,7 +797,7 @@ static int create_image_file_range(struct btrfs_trans_handle *trans,
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if (last_block > data.first_block) {
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ret = record_file_blocks(trans, root, objectid, inode,
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data.first_block, 0, last_block -
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data.first_block, 1);
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data.first_block, 0);
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if (ret)
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return ret;
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}
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@ -802,8 +808,8 @@ fail:
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/*
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* Create the ext2fs image file.
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*/
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static int create_ext2_image(struct btrfs_root *root, char *name,
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int namelen, ext2_filsys ext2_fs)
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static int create_ext2_image(struct btrfs_root *root, ext2_filsys ext2_fs,
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const char *name)
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{
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int ret;
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struct btrfs_key key;
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@ -837,8 +843,8 @@ static int create_ext2_image(struct btrfs_root *root, char *name,
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btrfs_set_stack_inode_size(&btrfs_inode, total_bytes);
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btrfs_set_stack_inode_nlink(&btrfs_inode, 1);
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btrfs_set_stack_inode_nblocks(&btrfs_inode, 0);
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btrfs_set_stack_inode_mode(&btrfs_inode, S_IFREG | 0444);
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btrfs_set_stack_inode_mode(&btrfs_inode, S_IFREG | 0400);
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btrfs_set_stack_inode_flags(&btrfs_inode, BTRFS_INODE_NODATASUM);
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btrfs_init_path(&path);
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trans = btrfs_start_transaction(root, 1);
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BUG_ON(!trans);
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@ -862,7 +868,7 @@ static int create_ext2_image(struct btrfs_root *root, char *name,
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goto fail;
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ret = record_file_extent(trans, root, objectid,
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&btrfs_inode, last_byte,
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new_block, sectorsize, 1);
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new_block, sectorsize, 0);
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if (ret)
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goto fail;
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}
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@ -901,7 +907,11 @@ again:
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slot++;
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continue;
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}
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/*
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* Check backref to distinguish extent items for normal
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* files (files that correspond to files in Ext2fs) from
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* extent items for ctree blocks.
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*/
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bytenr = key.objectid;
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num_bytes = key.offset;
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file_extent = 0;
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@ -944,7 +954,7 @@ again:
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goto fail;
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}
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ret = record_file_extent(trans, root, objectid, &btrfs_inode,
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bytenr, bytenr, num_bytes, 1);
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bytenr, bytenr, num_bytes, 0);
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if (ret)
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goto fail;
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last_byte = bytenr + num_bytes;
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@ -957,7 +967,14 @@ again:
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if (ret)
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goto fail;
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}
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/*
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* otime isn't used currently, so we can store some data in it.
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* These data are used by do_rollback to check whether the image
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* file have been modified.
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*/
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btrfs_set_stack_timespec_sec(&btrfs_inode.otime, trans->transid);
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btrfs_set_stack_timespec_nsec(&btrfs_inode.otime,
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total_bytes / sectorsize);
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ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
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if (ret)
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goto fail;
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@ -965,12 +982,13 @@ again:
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location.objectid = objectid;
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location.offset = 0;
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btrfs_set_key_type(&location, BTRFS_INODE_ITEM_KEY);
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ret = btrfs_insert_dir_item(trans, root, name, namelen,
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ret = btrfs_insert_dir_item(trans, root, name, strlen(name),
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btrfs_root_dirid(&root->root_item),
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&location, EXT2_FT_REG_FILE);
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if (ret)
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goto fail;
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ret = btrfs_insert_inode_ref(trans, root, name, namelen, objectid,
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ret = btrfs_insert_inode_ref(trans, root, name, strlen(name),
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objectid,
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btrfs_root_dirid(&root->root_item));
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if (ret)
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goto fail;
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@ -980,9 +998,7 @@ fail:
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btrfs_release_path(root, &path);
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return ret;
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}
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struct btrfs_root *create_subvol(struct btrfs_root *root,
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char *name, int namelen)
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struct btrfs_root *create_subvol(struct btrfs_root *root, const char *name)
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{
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int ret;
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u64 objectid;
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@ -1017,23 +1033,21 @@ struct btrfs_root *create_subvol(struct btrfs_root *root,
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if (ret)
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goto fail;
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location.offset = (u64)-1;
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ret = btrfs_insert_dir_item(trans, tree_root, name, namelen,
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ret = btrfs_insert_dir_item(trans, tree_root, name, strlen(name),
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btrfs_super_root_dir(&fs_info->super_copy),
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&location, BTRFS_FT_DIR);
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if (ret)
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goto fail;
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ret = btrfs_insert_inode_ref(trans, tree_root, name, namelen, objectid,
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ret = btrfs_insert_inode_ref(trans, tree_root, name, strlen(name),
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objectid,
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btrfs_super_root_dir(&fs_info->super_copy));
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if (ret)
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goto fail;
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ret = btrfs_commit_transaction(trans, root);
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BUG_ON(ret);
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new_root = btrfs_read_fs_root(fs_info, &location);
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if (!new_root) {
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return NULL;
|
||||
}
|
||||
|
||||
if (!new_root || IS_ERR(new_root))
|
||||
goto fail;
|
||||
trans = btrfs_start_transaction(new_root, 1);
|
||||
BUG_ON(!trans);
|
||||
ret = btrfs_make_root_dir(trans, new_root, BTRFS_FIRST_FREE_OBJECTID);
|
||||
|
|
@ -1143,40 +1157,69 @@ static int init_btrfs(struct btrfs_root *root)
|
|||
err:
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Migrate super block to it's default position.
|
||||
* This function is dangerous, it modifies a block used by ext2fs.
|
||||
* Migrate super block to it's default position and zero 0 ~ 16k
|
||||
*/
|
||||
static int migrate_super_block(struct btrfs_root *root, u64 sb_offset)
|
||||
static int migrate_super_block(int fd, u64 old_bytenr, u32 sectorsize)
|
||||
{
|
||||
int ret = -1;
|
||||
struct extent_buffer *old_eb;
|
||||
struct extent_buffer *sb_buffer;
|
||||
struct btrfs_trans_handle *trans;
|
||||
int ret;
|
||||
char *buf;
|
||||
u64 bytenr;
|
||||
u32 crc = ~(u32)0;
|
||||
u32 len = 512 - BTRFS_CSUM_SIZE;
|
||||
struct btrfs_super_block *super;
|
||||
|
||||
BUG_ON(sb_offset != BTRFS_SUPER_INFO_OFFSET);
|
||||
sb_buffer = read_tree_block(root, sb_offset, 512);
|
||||
if (!sb_buffer)
|
||||
goto fail;
|
||||
memset_extent_buffer(sb_buffer, 0, 0, sb_buffer->len);
|
||||
old_eb = root->fs_info->sb_buffer;
|
||||
root->fs_info->sb_buffer = sb_buffer;
|
||||
btrfs_set_super_bytenr(&root->fs_info->super_copy, sb_offset);
|
||||
trans = btrfs_start_transaction(root, 1);
|
||||
BUG_ON(!trans);
|
||||
ret = btrfs_free_extent(trans, root, old_eb->start, root->leafsize,
|
||||
0, 0, 0, 0, 1);
|
||||
ret = fsync(fd);
|
||||
if (ret)
|
||||
goto fail;
|
||||
ret = btrfs_commit_transaction(trans, root);
|
||||
free_extent_buffer(old_eb);
|
||||
BUG_ON(ret);
|
||||
|
||||
BUG_ON(sectorsize < sizeof(super));
|
||||
buf = malloc(sectorsize);
|
||||
if (!buf)
|
||||
return -ENOMEM;
|
||||
ret = pread(fd, buf, sectorsize, old_bytenr);
|
||||
if (ret != sectorsize)
|
||||
goto fail;
|
||||
|
||||
super = (struct btrfs_super_block *)buf;
|
||||
BUG_ON(btrfs_super_bytenr(super) != old_bytenr);
|
||||
btrfs_set_super_bytenr(super, BTRFS_SUPER_INFO_OFFSET);
|
||||
|
||||
crc = crc32c(crc, buf + BTRFS_CSUM_SIZE, len);
|
||||
crc = ~cpu_to_le32(crc);
|
||||
memcpy(super->csum, &crc, BTRFS_CRC32_SIZE);
|
||||
|
||||
ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
|
||||
if (ret < 0)
|
||||
goto fail;
|
||||
/* How to handle this case? */
|
||||
BUG_ON(ret != sectorsize);
|
||||
|
||||
ret = fsync(fd);
|
||||
if (ret)
|
||||
goto fail;
|
||||
|
||||
memset(buf, 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, 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;
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
int do_convert(const char *devname, int datacsum)
|
||||
{
|
||||
int i, fd, ret;
|
||||
u32 blocksize;
|
||||
|
|
@ -1185,15 +1228,11 @@ int main(int argc, char *argv[])
|
|||
u64 super_bytenr;
|
||||
ext2_filsys ext2_fs;
|
||||
struct btrfs_root *root;
|
||||
struct btrfs_root *snap_root;
|
||||
struct btrfs_root *ext2_root;
|
||||
|
||||
if (argc != 2) {
|
||||
fprintf(stderr, "usage: %s device\n", argv[0]);
|
||||
exit(1);
|
||||
}
|
||||
ret = open_ext2fs(argv[1], &ext2_fs);
|
||||
ret = open_ext2fs(devname, &ext2_fs);
|
||||
if (ret) {
|
||||
fprintf(stderr, "failed to open the Ext2fs\n");
|
||||
fprintf(stderr, "unable to open the Ext2fs\n");
|
||||
goto fail;
|
||||
}
|
||||
blocksize = ext2_fs->blocksize;
|
||||
|
|
@ -1204,7 +1243,7 @@ int main(int argc, char *argv[])
|
|||
}
|
||||
if (!(ext2_fs->super->s_feature_incompat &
|
||||
EXT2_FEATURE_INCOMPAT_FILETYPE)) {
|
||||
fprintf(stderr, "missing filetype feature\n");
|
||||
fprintf(stderr, "filetype feature is missing\n");
|
||||
goto fail;
|
||||
}
|
||||
for (i = 0; i < 4; i++) {
|
||||
|
|
@ -1216,64 +1255,308 @@ int main(int argc, char *argv[])
|
|||
blocks[i] *= blocksize;
|
||||
}
|
||||
super_bytenr = blocks[0];
|
||||
|
||||
fd = open(argv[1], O_RDWR);
|
||||
fd = open(devname, O_RDWR);
|
||||
if (fd < 0) {
|
||||
fprintf(stderr, "unable to open %s\n", argv[1]);
|
||||
fprintf(stderr, "unable to open %s\n", devname);
|
||||
goto fail;
|
||||
}
|
||||
ret = make_btrfs(fd, blocks, total_bytes, blocksize,
|
||||
blocksize, blocksize, blocksize);
|
||||
if (ret) {
|
||||
fprintf(stderr, "failed to create ctree\n");
|
||||
fprintf(stderr, "unable to create initial ctree\n");
|
||||
goto fail;
|
||||
}
|
||||
root = open_ctree_fd(fd, super_bytenr);
|
||||
if (!root) {
|
||||
fprintf(stderr, "failed to open ctree\n");
|
||||
fprintf(stderr, "unable to open ctree\n");
|
||||
goto fail;
|
||||
}
|
||||
fd = dup(fd);
|
||||
if (fd < 0) {
|
||||
fprintf(stderr, "unable to duplicate file descriptor\n");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
root->fs_info->priv_data = ext2_fs;
|
||||
root->fs_info->extent_ops = &extent_ops;
|
||||
|
||||
ret = init_btrfs(root);
|
||||
if (ret) {
|
||||
fprintf(stderr, "failed to setup the root tree\n");
|
||||
fprintf(stderr, "unable to setup the root tree\n");
|
||||
goto fail;
|
||||
}
|
||||
snap_root = create_subvol(root, "ext2_saved", 10);
|
||||
if (!snap_root) {
|
||||
fprintf(stderr, "failed to create subvol\n");
|
||||
ext2_root = create_subvol(root, "ext2_saved");
|
||||
if (!ext2_root) {
|
||||
fprintf(stderr, "unable to create subvol\n");
|
||||
goto fail;
|
||||
}
|
||||
printf("creating btrfs metadata.\n");
|
||||
ret = copy_inodes(root, ext2_fs);
|
||||
ret = copy_inodes(root, ext2_fs, datacsum);
|
||||
if (ret) {
|
||||
fprintf(stderr, "error during copy_inodes %d\n", ret);
|
||||
goto fail;
|
||||
}
|
||||
printf("creating ext2fs image file.\n");
|
||||
ret = create_ext2_image(snap_root, "image", 5, ext2_fs);
|
||||
ret = create_ext2_image(ext2_root, ext2_fs, "image");
|
||||
if (ret) {
|
||||
fprintf(stderr, "failed to create fs image\n");
|
||||
fprintf(stderr, "error during create_ext2_image %d\n", ret);
|
||||
goto fail;
|
||||
}
|
||||
ret = migrate_super_block(root, BTRFS_SUPER_INFO_OFFSET);
|
||||
if (ret) {
|
||||
fprintf(stderr, "failed to update super block\n");
|
||||
goto fail;
|
||||
}
|
||||
btrfs_free_fs_root(snap_root->fs_info, snap_root);
|
||||
btrfs_free_fs_root(ext2_root->fs_info, ext2_root);
|
||||
ret = close_ctree(root);
|
||||
if (ret) {
|
||||
fprintf(stderr, "error during close_ctree %d\n", ret);
|
||||
goto fail;
|
||||
}
|
||||
close_ext2fs(ext2_fs);
|
||||
|
||||
/* finally migrate super block to its default postion */
|
||||
ret = migrate_super_block(fd, super_bytenr, blocksize);
|
||||
if (ret) {
|
||||
fprintf(stderr, "unable to migrate super block\n");
|
||||
goto fail;
|
||||
}
|
||||
close(fd);
|
||||
printf("conversion complete.\n");
|
||||
exit(0);
|
||||
return 0;
|
||||
fail:
|
||||
fprintf(stderr, "conversion abort.\n");
|
||||
fprintf(stderr, "conversion aborted.\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
int do_rollback(const char *devname, int force)
|
||||
{
|
||||
int fd;
|
||||
int ret;
|
||||
int modified = 0;
|
||||
struct btrfs_root *root;
|
||||
struct btrfs_root *ext2_root;
|
||||
struct btrfs_dir_item *dir;
|
||||
struct btrfs_inode_item *inode;
|
||||
struct btrfs_file_extent_item *fi;
|
||||
struct btrfs_inode_timespec *tspec;
|
||||
struct extent_buffer *leaf;
|
||||
struct btrfs_key key;
|
||||
struct btrfs_path path;
|
||||
char *buf;
|
||||
char *name;
|
||||
u64 bytenr;
|
||||
u64 num_bytes;
|
||||
u64 root_dir;
|
||||
u64 objectid;
|
||||
u64 offset;
|
||||
u64 first_free;
|
||||
u64 last_trans;
|
||||
u64 total_bytes;
|
||||
|
||||
fd = open(devname, O_RDWR);
|
||||
if (fd < 0) {
|
||||
fprintf(stderr, "unable to open %s\n", devname);
|
||||
goto fail;
|
||||
}
|
||||
root = open_ctree_fd(fd, 0);
|
||||
if (!root) {
|
||||
fprintf(stderr, "unable to open ctree\n");
|
||||
goto fail;
|
||||
}
|
||||
fd = dup(fd);
|
||||
if (fd < 0) {
|
||||
fprintf(stderr, "unable to duplicate file descriptor\n");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
first_free = BTRFS_SUPER_INFO_OFFSET + root->sectorsize * 2 - 1;
|
||||
first_free &= ~((u64)root->sectorsize - 1);
|
||||
buf = malloc(first_free);
|
||||
if (!buf) {
|
||||
fprintf(stderr, "unable to allocate memory\n");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
btrfs_init_path(&path);
|
||||
name = "ext2_saved";
|
||||
root_dir = btrfs_super_root_dir(&root->fs_info->super_copy);
|
||||
dir = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, &path,
|
||||
root_dir, name, strlen(name), 0);
|
||||
if (!dir || IS_ERR(dir)) {
|
||||
fprintf(stderr, "unable to find subvol %s\n", name);
|
||||
goto fail;
|
||||
}
|
||||
leaf = path.nodes[0];
|
||||
btrfs_dir_item_key_to_cpu(leaf, dir, &key);
|
||||
btrfs_release_path(root->fs_info->tree_root, &path);
|
||||
|
||||
ext2_root = btrfs_read_fs_root(root->fs_info, &key);
|
||||
if (!ext2_root || IS_ERR(ext2_root)) {
|
||||
fprintf(stderr, "unable to open subvol %s\n", name);
|
||||
goto fail;
|
||||
}
|
||||
|
||||
name = "image";
|
||||
root_dir = btrfs_root_dirid(&root->root_item);
|
||||
dir = btrfs_lookup_dir_item(NULL, ext2_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(ext2_root, &path);
|
||||
|
||||
objectid = key.objectid;
|
||||
|
||||
ret = btrfs_lookup_inode(NULL, ext2_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);
|
||||
tspec = btrfs_inode_otime(inode);
|
||||
/*
|
||||
* get image file size and transaction id stored in 'otime' field.
|
||||
* see comments in create_ext2_image.
|
||||
*/
|
||||
last_trans = btrfs_timespec_sec(leaf, tspec);
|
||||
total_bytes = btrfs_timespec_nsec(leaf, tspec);
|
||||
total_bytes *= root->sectorsize;
|
||||
btrfs_release_path(ext2_root, &path);
|
||||
if (total_bytes != btrfs_inode_size(leaf, inode)) {
|
||||
fprintf(stderr, "image file size mismatch\n");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
key.objectid = objectid;
|
||||
key.offset = 0;
|
||||
btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
|
||||
ret = btrfs_search_slot(NULL, ext2_root, &key, &path, 0, 0);
|
||||
if (ret != 0) {
|
||||
fprintf(stderr, "unable to find first file extent\n");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
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_generation(leaf, fi) > last_trans) {
|
||||
modified = 1;
|
||||
break;
|
||||
}
|
||||
if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG)
|
||||
break;
|
||||
|
||||
if (offset >= first_free)
|
||||
goto next;
|
||||
|
||||
bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
|
||||
if (bytenr == 0)
|
||||
break;
|
||||
bytenr += btrfs_file_extent_offset(leaf, fi);
|
||||
num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
|
||||
if (num_bytes > first_free - offset)
|
||||
num_bytes = first_free - offset;
|
||||
|
||||
ret = pread(fd, buf + offset, num_bytes, bytenr);
|
||||
if (ret != num_bytes) {
|
||||
fprintf(stderr, "unable to read required data\n");
|
||||
btrfs_release_path(ext2_root, &path);
|
||||
goto fail;
|
||||
}
|
||||
next:
|
||||
offset += btrfs_file_extent_num_bytes(leaf, fi);
|
||||
path.slots[0]++;
|
||||
}
|
||||
btrfs_release_path(ext2_root, &path);
|
||||
|
||||
if (modified) {
|
||||
fprintf(stderr, "image file has been modified\n");
|
||||
goto fail;
|
||||
}
|
||||
if (offset < total_bytes) {
|
||||
fprintf(stderr, "unable to check all file extents\n");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
btrfs_free_fs_root(ext2_root->fs_info, ext2_root);
|
||||
ret = close_ctree(root);
|
||||
if (ret) {
|
||||
fprintf(stderr, "error during close_ctree %d\n", ret);
|
||||
goto fail;
|
||||
}
|
||||
|
||||
ret = pwrite(fd, buf, first_free, 0);
|
||||
if (ret < 0) {
|
||||
fprintf(stderr, "error during pwrite %d\n", ret);
|
||||
goto fail;
|
||||
}
|
||||
/* How to handle this case? */
|
||||
BUG_ON(ret != first_free);
|
||||
ret = fsync(fd);
|
||||
if (ret) {
|
||||
fprintf(stderr, "error during fsync %d\n", ret);
|
||||
goto fail;
|
||||
}
|
||||
close(fd);
|
||||
free(buf);
|
||||
printf("rollback complete.\n");
|
||||
return 0;
|
||||
fail:
|
||||
fprintf(stderr, "rollback aborted.\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
static void print_usage(void)
|
||||
{
|
||||
printf("usage: btrfs-convert [-d] [-r] device\n");
|
||||
printf("\t-d disable data checksum\n");
|
||||
printf("\t-r roll back to ext2fs\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
int ret;
|
||||
int datacsum = 1;
|
||||
int rollback = 0;
|
||||
char *file;
|
||||
|
||||
while(1) {
|
||||
int c = getopt(argc, argv, "dr");
|
||||
if (c < 0)
|
||||
break;
|
||||
switch(c) {
|
||||
case 'd':
|
||||
datacsum = 0;
|
||||
break;
|
||||
case 'r':
|
||||
rollback = 1;
|
||||
break;
|
||||
default:
|
||||
print_usage();
|
||||
}
|
||||
}
|
||||
argc = argc - optind;
|
||||
if (argc == 1) {
|
||||
file = argv[optind];
|
||||
} else {
|
||||
print_usage();
|
||||
}
|
||||
if (rollback) {
|
||||
ret = do_rollback(file, 0);
|
||||
} else {
|
||||
ret = do_convert(file, datacsum);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -417,8 +417,13 @@ struct btrfs_root *open_ctree_fd(int fp, u64 sb_bytenr)
|
|||
read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
|
||||
(unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
|
||||
BTRFS_FSID_SIZE);
|
||||
disk_super = &fs_info->super_copy;
|
||||
|
||||
disk_super = &fs_info->super_copy;
|
||||
if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
|
||||
sizeof(disk_super->magic))) {
|
||||
printk("No valid btrfs found\n");
|
||||
BUG_ON(1);
|
||||
}
|
||||
nodesize = btrfs_super_nodesize(disk_super);
|
||||
leafsize = btrfs_super_leafsize(disk_super);
|
||||
sectorsize = btrfs_super_sectorsize(disk_super);
|
||||
|
|
|
|||
10
utils.c
10
utils.c
|
|
@ -32,9 +32,7 @@
|
|||
#include "transaction.h"
|
||||
#include "crc32c.h"
|
||||
#include "utils.h"
|
||||
|
||||
static u64 reference_root_table[4] = {
|
||||
[0] = 0,
|
||||
[1] = BTRFS_ROOT_TREE_OBJECTID,
|
||||
[2] = BTRFS_EXTENT_TREE_OBJECTID,
|
||||
[3] = BTRFS_FS_TREE_OBJECTID,
|
||||
|
|
@ -142,12 +140,10 @@ int make_btrfs(int fd, u64 blocks[4], u64 num_bytes, u32 nodesize,
|
|||
extent_item = btrfs_item_ptr(buf, nritems, struct btrfs_extent_item);
|
||||
btrfs_set_extent_refs(buf, extent_item, 1);
|
||||
nritems++;
|
||||
for (i = 1; i < 4; i++) {
|
||||
BUG_ON(blocks[i] < first_free);
|
||||
BUG_ON(blocks[i] < blocks[i - 1]);
|
||||
|
||||
for (i = 0; i < 4; i++) {
|
||||
if (blocks[i] < first_free) {
|
||||
BUG_ON(i > 0);
|
||||
continue;
|
||||
}
|
||||
/* create extent item */
|
||||
itemoff = itemoff - sizeof(struct btrfs_extent_item);
|
||||
btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
|
||||
|
|
|
|||
Loading…
Reference in New Issue