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btrfs-progs: add btrfs_clear_free_space_tree() from the kernel

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Reviewed-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Omar Sandoval 2016-11-14 10:43:21 -08:00 committed by David Sterba
parent 441d8aea8f
commit 9814411021
5 changed files with 129 additions and 0 deletions
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6
ctree.h
View File

@ -2504,6 +2504,10 @@ int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct extent_buffer *buf, int record_parent);
int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct extent_buffer *buf, int record_parent);
int btrfs_free_tree_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *buf,
u64 parent, int last_ref);
int btrfs_free_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, u64 parent,
@ -2664,6 +2668,8 @@ int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_key *key, struct btrfs_root_item
*item);
int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_key *key);
int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_key *key, struct btrfs_root_item
*item);

11
extent-tree.c
View File

@ -2467,6 +2467,17 @@ static int del_pending_extents(struct btrfs_trans_handle *trans, struct
return err;
}
int btrfs_free_tree_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *buf,
u64 parent, int last_ref)
{
return btrfs_free_extent(trans, root, buf->start, buf->len, parent,
root->root_key.objectid,
btrfs_header_level(buf), 0);
}
/*
* remove an extent from the root, returns 0 on success
*/

86
free-space-tree.c
View File

@ -20,6 +20,7 @@
#include "disk-io.h"
#include "free-space-cache.h"
#include "free-space-tree.h"
#include "transaction.h"
static struct btrfs_free_space_info *
search_free_space_info(struct btrfs_trans_handle *trans,
@ -67,6 +68,91 @@ static int free_space_test_bit(struct btrfs_block_group_cache *block_group,
return !!extent_buffer_test_bit(leaf, ptr, i);
}
static int clear_free_space_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
struct btrfs_path *path;
struct btrfs_key key;
int nr;
int ret;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = 0;
key.type = 0;
key.offset = 0;
while (1) {
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret < 0)
goto out;
nr = btrfs_header_nritems(path->nodes[0]);
if (!nr)
break;
path->slots[0] = 0;
ret = btrfs_del_items(trans, root, path, 0, nr);
if (ret)
goto out;
btrfs_release_path(path);
}
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *tree_root = fs_info->tree_root;
struct btrfs_root *free_space_root = fs_info->free_space_root;
int ret;
u64 features;
trans = btrfs_start_transaction(tree_root, 0);
if (IS_ERR(trans))
return PTR_ERR(trans);
features = btrfs_super_compat_ro_flags(fs_info->super_copy);
features &= ~(BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID |
BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE);
btrfs_set_super_compat_ro_flags(fs_info->super_copy, features);
fs_info->free_space_root = NULL;
ret = clear_free_space_tree(trans, free_space_root);
if (ret)
goto abort;
ret = btrfs_del_root(trans, tree_root, &free_space_root->root_key);
if (ret)
goto abort;
list_del(&free_space_root->dirty_list);
ret = clean_tree_block(trans, tree_root, free_space_root->node);
if (ret)
goto abort;
ret = btrfs_free_tree_block(trans, free_space_root,
free_space_root->node, 0, 1);
if (ret)
goto abort;
free_extent_buffer(free_space_root->node);
free_extent_buffer(free_space_root->commit_root);
kfree(free_space_root);
ret = btrfs_commit_transaction(trans, tree_root);
abort:
return ret;
}
static int load_free_space_bitmaps(struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path,

1
free-space-tree.h
View File

@ -19,6 +19,7 @@
#ifndef __BTRFS_FREE_SPACE_TREE_H__
#define __BTRFS_FREE_SPACE_TREE_H__
int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info);
int load_free_space_tree(struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group);

25
root-tree.c
View File

@ -143,6 +143,31 @@ int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
return ret;
}
/* drop the root item for 'key' from 'root' */
int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_key *key)
{
struct btrfs_path *path;
int ret;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
ret = btrfs_search_slot(trans, root, key, path, -1, 1);
if (ret < 0)
goto out;
if (ret != 0) {
ret = -ENOENT;
goto out;
}
ret = btrfs_del_item(trans, root, path);
out:
btrfs_free_path(path);
return ret;
}
/*
* add a btrfs_root_ref item. type is either BTRFS_ROOT_REF_KEY
* or BTRFS_ROOT_BACKREF_KEY.