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Update find_free_extent for the ext3 conversion tool 

This patch adds customized find_free_extent support to btrfs-progs,
the conversion program requires this.
This commit is contained in:
Yan 2008-01-04 10:41:19 -05:00 committed by David Woodhouse
parent 7777e63b42
commit 84b99666be
3 changed files with 26 additions and 10 deletions
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10
ctree.h
View File

@ -298,6 +298,12 @@ struct btrfs_block_group_cache {
int cached;
u64 pinned;
};
struct btrfs_extent_ops {
int (*alloc_extent)(struct btrfs_root *root, u64 num_bytes,
u64 hint_byte, struct btrfs_key *ins);
int (*free_extent)(struct btrfs_root *root, u64 bytenr,
u64 num_bytes);
};
struct btrfs_fs_info {
u8 fsid[BTRFS_FSID_SIZE];
@ -322,8 +328,10 @@ struct btrfs_fs_info {
struct mutex fs_mutex;
int fp;
u64 total_pinned;
};
struct btrfs_extent_ops *extent_ops;
void *priv_data;
};
/*
* in ram representation of the tree. extent_root is used for all allocations
* and for the extent tree extent_root root.

3
disk-io.c
View File

@ -396,7 +396,8 @@ struct btrfs_root *open_ctree_fd(int fp, u64 sb_bytenr)
fs_info->fs_root = root;
fs_info->tree_root = tree_root;
fs_info->extent_root = extent_root;
fs_info->extent_ops = NULL;
fs_info->priv_data = NULL;
extent_map_tree_init(&fs_info->extent_cache);
extent_map_tree_init(&fs_info->free_space_cache);
extent_map_tree_init(&fs_info->pending_tree);

19
extent-tree.c
View File

@ -1209,6 +1209,7 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_extent_ops *ops = info->extent_ops;
struct btrfs_root *extent_root = info->extent_root;
struct extent_buffer *leaf;
int ret;
@ -1272,11 +1273,13 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
root_used = btrfs_root_used(&root->root_item);
btrfs_set_root_used(&root->root_item,
root_used - num_bytes);
ret = btrfs_del_item(trans, extent_root, path);
if (ret) {
if (ret)
return ret;
}
if (ops && ops->free_extent)
ops->free_extent(root, bytenr, num_bytes);
ret = update_block_group(trans, root, bytenr, num_bytes, 0,
mark_free, 0);
BUG_ON(ret);
@ -1626,6 +1629,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
u64 new_hint;
*/
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_extent_ops *ops = info->extent_ops;
struct btrfs_root *extent_root = info->extent_root;
struct btrfs_extent_item extent_item;
struct btrfs_path *path;
@ -1637,12 +1641,15 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
if (new_hint < btrfs_super_total_bytes(&info->super_copy))
hint_byte = new_hint;
*/
WARN_ON(num_bytes < root->sectorsize);
if (ops && ops->alloc_extent) {
ret = ops->alloc_extent(root, num_bytes, hint_byte, ins);
} else {
ret = find_free_extent(trans, root, num_bytes, empty_size,
search_start, search_end, hint_byte, ins,
trans->alloc_exclude_start,
search_start, search_end, hint_byte,
ins, trans->alloc_exclude_start,
trans->alloc_exclude_nr, data);
}
BUG_ON(ret);
if (ret)
return ret;