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https://github.com/kdave/btrfs-progs
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btrfs-progs: convert: Introduce new function to create converted image
Use new function, create_convert_image_v2() to create snapshot of old filesystem. Unlike old function which is called after copying all inodes, this function need to be called before copying inodes. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo
David Sterba
parent
a21cc1ca3f
commit
e653d42658
184
btrfs-convert.c
184
btrfs-convert.c
@ -1439,6 +1439,7 @@ static int create_image_file_range(struct btrfs_trans_handle *trans,
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fail:
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return ret;
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}
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/*
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* Create the fs image file.
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*/
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@ -1632,6 +1633,189 @@ fail:
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return ret;
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}
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static int create_image_file_range_v2(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct cache_tree *used,
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struct btrfs_inode_item *inode,
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u64 ino, u64 bytenr, u64 *ret_len,
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int datacsum)
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{
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struct cache_extent *cache;
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struct btrfs_block_group_cache *bg_cache;
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u64 len = *ret_len;
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u64 disk_bytenr;
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int ret;
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BUG_ON(bytenr != round_down(bytenr, root->sectorsize));
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BUG_ON(len != round_down(len, root->sectorsize));
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len = min_t(u64, len, BTRFS_MAX_EXTENT_SIZE);
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cache = search_cache_extent(used, bytenr);
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if (cache) {
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if (cache->start <= bytenr) {
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/*
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* |///////Used///////|
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* |<--insert--->|
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* bytenr
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*/
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len = min_t(u64, len, cache->start + cache->size -
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bytenr);
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disk_bytenr = bytenr;
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} else {
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/*
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* |//Used//|
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* |<-insert-->|
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* bytenr
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*/
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len = min(len, cache->start - bytenr);
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disk_bytenr = 0;
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datacsum = 0;
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}
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} else {
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/*
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* |//Used//| |EOF
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* |<-insert-->|
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* bytenr
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*/
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disk_bytenr = 0;
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datacsum = 0;
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}
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if (disk_bytenr) {
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/* Check if the range is in a data block group */
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bg_cache = btrfs_lookup_block_group(root->fs_info, bytenr);
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if (!bg_cache)
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return -ENOENT;
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if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_DATA))
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return -EINVAL;
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/* The extent should never cross block group boundary */
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len = min_t(u64, len, bg_cache->key.objectid +
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bg_cache->key.offset - bytenr);
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}
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BUG_ON(len != round_down(len, root->sectorsize));
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ret = btrfs_record_file_extent(trans, root, ino, inode, bytenr,
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disk_bytenr, len);
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if (ret < 0)
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return ret;
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if (datacsum)
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ret = csum_disk_extent(trans, root, bytenr, len);
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*ret_len = len;
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return ret;
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}
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static int wipe_reserved_ranges(struct cache_tree *tree, u64 min_stripe_size,
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int ensure_size);
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/*
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* Create the fs image file of old filesystem.
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*
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* This is completely fs independent as we have cctx->used, only
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* need to create file extents pointing to all the positions.
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* TODO: Add handler for reserved ranges in next patch
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*/
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static int create_image_v2(struct btrfs_root *root,
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struct btrfs_mkfs_config *cfg,
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struct btrfs_convert_context *cctx,
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u64 size, char *name, int datacsum)
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{
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struct btrfs_inode_item buf;
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struct btrfs_trans_handle *trans;
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struct btrfs_path *path = NULL;
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struct btrfs_key key;
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struct cache_extent *cache;
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struct cache_tree used_tmp;
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u64 cur;
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u64 ino;
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int ret;
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trans = btrfs_start_transaction(root, 1);
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if (!trans)
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return -ENOMEM;
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cache_tree_init(&used_tmp);
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ret = btrfs_find_free_objectid(trans, root, BTRFS_FIRST_FREE_OBJECTID,
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&ino);
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if (ret < 0)
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goto out;
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ret = btrfs_new_inode(trans, root, ino, 0600 | S_IFREG);
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if (ret < 0)
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goto out;
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ret = btrfs_add_link(trans, root, ino, BTRFS_FIRST_FREE_OBJECTID, name,
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strlen(name), BTRFS_FT_REG_FILE, NULL, 1);
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if (ret < 0)
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goto out;
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path = btrfs_alloc_path();
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if (!path) {
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ret = -ENOMEM;
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goto out;
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}
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key.objectid = ino;
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key.type = BTRFS_INODE_ITEM_KEY;
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key.offset = 0;
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ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
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if (ret) {
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ret = (ret > 0 ? -ENOENT : ret);
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goto out;
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}
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read_extent_buffer(path->nodes[0], &buf,
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btrfs_item_ptr_offset(path->nodes[0], path->slots[0]),
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sizeof(buf));
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btrfs_release_path(path);
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/*
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* Create a new used space cache, which doesn't contain the reserved
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* range
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*/
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for (cache = first_cache_extent(&cctx->used); cache;
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cache = next_cache_extent(cache)) {
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ret = add_cache_extent(&used_tmp, cache->start, cache->size);
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if (ret < 0)
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goto out;
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}
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ret = wipe_reserved_ranges(&used_tmp, 0, 0);
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if (ret < 0)
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goto out;
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/*
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* Start from 1M, as 0~1M is reserved, and create_image_file_range_v2()
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* can't handle bytenr 0(will consider it as a hole)
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*/
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cur = 1024 * 1024;
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while (cur < size) {
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u64 len = size - cur;
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ret = create_image_file_range_v2(trans, root, &used_tmp,
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&buf, ino, cur, &len, datacsum);
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if (ret < 0)
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goto out;
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cur += len;
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}
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key.objectid = ino;
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key.type = BTRFS_INODE_ITEM_KEY;
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key.offset = 0;
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ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
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if (ret) {
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ret = (ret > 0 ? -ENOENT : ret);
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goto out;
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}
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btrfs_set_stack_inode_size(&buf, cfg->num_bytes);
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write_extent_buffer(path->nodes[0], &buf,
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btrfs_item_ptr_offset(path->nodes[0], path->slots[0]),
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sizeof(buf));
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out:
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free_extent_cache_tree(&used_tmp);
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btrfs_free_path(path);
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btrfs_commit_transaction(trans, root);
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return ret;
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}
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static struct btrfs_root * link_subvol(struct btrfs_root *root,
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const char *base, u64 root_objectid)
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{
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