Btrfs: do not reuse objectid of deleted snapshot/subvol
The new back reference format does not allow reusing objectid of deleted snapshot/subvol. So we use ++highest_objectid to allocate objectid for new snapshot/subvol. Now we use ++highest_objectid to allocate objectid for both new inode and new snapshot/subvolume, so this patch removes 'find hole' code in btrfs_find_free_objectid. Signed-off-by: Yan Zheng <zheng.yan@oracle.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan, Zheng
Chris Mason
parent
1c4850e21d
commit
13a8a7c8c4
@ -1007,8 +1007,8 @@ struct btrfs_root {
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u32 stripesize;
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u32 type;
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u64 highest_inode;
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u64 last_inode_alloc;
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u64 highest_objectid;
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int ref_cows;
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int track_dirty;
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u64 defrag_trans_start;
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@ -895,8 +895,7 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
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root->fs_info = fs_info;
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root->objectid = objectid;
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root->last_trans = 0;
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root->highest_inode = 0;
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root->last_inode_alloc = 0;
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root->highest_objectid = 0;
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root->name = NULL;
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root->in_sysfs = 0;
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root->inode_tree.rb_node = NULL;
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@ -1095,7 +1094,6 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
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struct btrfs_fs_info *fs_info = tree_root->fs_info;
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struct btrfs_path *path;
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struct extent_buffer *l;
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u64 highest_inode;
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u64 generation;
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u32 blocksize;
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int ret = 0;
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@ -1110,7 +1108,7 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
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kfree(root);
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return ERR_PTR(ret);
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}
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goto insert;
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goto out;
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}
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__setup_root(tree_root->nodesize, tree_root->leafsize,
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@ -1120,39 +1118,30 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
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path = btrfs_alloc_path();
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BUG_ON(!path);
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ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
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if (ret != 0) {
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if (ret > 0)
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ret = -ENOENT;
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goto out;
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}
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if (ret == 0) {
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l = path->nodes[0];
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read_extent_buffer(l, &root->root_item,
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btrfs_item_ptr_offset(l, path->slots[0]),
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sizeof(root->root_item));
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memcpy(&root->root_key, location, sizeof(*location));
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ret = 0;
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out:
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btrfs_release_path(root, path);
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}
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btrfs_free_path(path);
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if (ret) {
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kfree(root);
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if (ret > 0)
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ret = -ENOENT;
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return ERR_PTR(ret);
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}
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generation = btrfs_root_generation(&root->root_item);
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blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
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root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
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blocksize, generation);
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root->commit_root = btrfs_root_node(root);
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BUG_ON(!root->node);
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insert:
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if (location->objectid != BTRFS_TREE_LOG_OBJECTID) {
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out:
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if (location->objectid != BTRFS_TREE_LOG_OBJECTID)
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root->ref_cows = 1;
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ret = btrfs_find_highest_inode(root, &highest_inode);
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if (ret == 0) {
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root->highest_inode = highest_inode;
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root->last_inode_alloc = highest_inode;
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}
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}
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return root;
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}
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@ -177,8 +177,6 @@ int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
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ret = btrfs_insert_empty_item(trans, root, path, &key,
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sizeof(struct btrfs_inode_item));
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if (ret == 0 && objectid > root->highest_inode)
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root->highest_inode = objectid;
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return ret;
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}
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@ -43,9 +43,10 @@ int btrfs_find_highest_inode(struct btrfs_root *root, u64 *objectid)
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slot = path->slots[0] - 1;
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l = path->nodes[0];
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btrfs_item_key_to_cpu(l, &found_key, slot);
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*objectid = found_key.objectid;
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*objectid = max_t(u64, found_key.objectid,
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BTRFS_FIRST_FREE_OBJECTID - 1);
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} else {
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*objectid = BTRFS_FIRST_FREE_OBJECTID;
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*objectid = BTRFS_FIRST_FREE_OBJECTID - 1;
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}
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ret = 0;
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error:
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@ -53,91 +54,27 @@ error:
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return ret;
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}
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/*
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* walks the btree of allocated inodes and find a hole.
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*/
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int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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u64 dirid, u64 *objectid)
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{
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struct btrfs_path *path;
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struct btrfs_key key;
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int ret;
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int slot = 0;
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u64 last_ino = 0;
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int start_found;
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struct extent_buffer *l;
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struct btrfs_key search_key;
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u64 search_start = dirid;
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mutex_lock(&root->objectid_mutex);
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if (root->last_inode_alloc >= BTRFS_FIRST_FREE_OBJECTID &&
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root->last_inode_alloc < BTRFS_LAST_FREE_OBJECTID) {
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*objectid = ++root->last_inode_alloc;
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mutex_unlock(&root->objectid_mutex);
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return 0;
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}
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path = btrfs_alloc_path();
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BUG_ON(!path);
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search_start = max(search_start, (u64)BTRFS_FIRST_FREE_OBJECTID);
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search_key.objectid = search_start;
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search_key.type = 0;
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search_key.offset = 0;
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start_found = 0;
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ret = btrfs_search_slot(trans, root, &search_key, path, 0, 0);
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if (ret < 0)
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goto error;
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if (unlikely(root->highest_objectid < BTRFS_FIRST_FREE_OBJECTID)) {
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ret = btrfs_find_highest_inode(root, &root->highest_objectid);
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if (ret)
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goto out;
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}
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while (1) {
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l = path->nodes[0];
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slot = path->slots[0];
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if (slot >= btrfs_header_nritems(l)) {
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ret = btrfs_next_leaf(root, path);
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if (ret == 0)
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continue;
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if (ret < 0)
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goto error;
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if (!start_found) {
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*objectid = search_start;
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start_found = 1;
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goto found;
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if (unlikely(root->highest_objectid >= BTRFS_LAST_FREE_OBJECTID)) {
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ret = -ENOSPC;
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goto out;
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}
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*objectid = last_ino > search_start ?
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last_ino : search_start;
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goto found;
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}
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btrfs_item_key_to_cpu(l, &key, slot);
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if (key.objectid >= search_start) {
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if (start_found) {
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if (last_ino < search_start)
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last_ino = search_start;
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if (key.objectid > last_ino) {
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*objectid = last_ino;
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goto found;
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}
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} else if (key.objectid > search_start) {
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*objectid = search_start;
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goto found;
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}
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}
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if (key.objectid >= BTRFS_LAST_FREE_OBJECTID)
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break;
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start_found = 1;
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last_ino = key.objectid + 1;
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path->slots[0]++;
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}
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BUG_ON(1);
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found:
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btrfs_release_path(root, path);
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btrfs_free_path(path);
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BUG_ON(*objectid < search_start);
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mutex_unlock(&root->objectid_mutex);
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return 0;
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error:
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btrfs_release_path(root, path);
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btrfs_free_path(path);
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*objectid = ++root->highest_objectid;
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ret = 0;
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out:
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mutex_unlock(&root->objectid_mutex);
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return ret;
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}
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@ -3624,9 +3624,6 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
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if (ret != 0)
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goto fail;
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if (objectid > root->highest_inode)
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root->highest_inode = objectid;
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inode->i_uid = current_fsuid();
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if (dir && (dir->i_mode & S_ISGID)) {
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@ -2951,7 +2951,6 @@ int btrfs_recover_log_trees(struct btrfs_root *log_root_tree)
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struct btrfs_key tmp_key;
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struct btrfs_root *log;
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struct btrfs_fs_info *fs_info = log_root_tree->fs_info;
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u64 highest_inode;
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struct walk_control wc = {
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.process_func = process_one_buffer,
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.stage = 0,
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@ -3010,11 +3009,6 @@ again:
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path);
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BUG_ON(ret);
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}
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ret = btrfs_find_highest_inode(wc.replay_dest, &highest_inode);
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if (ret == 0) {
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wc.replay_dest->highest_inode = highest_inode;
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wc.replay_dest->last_inode_alloc = highest_inode;
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}
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key.offset = found_key.offset - 1;
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wc.replay_dest->log_root = NULL;
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