Yan Zheng
2008-Jan-04 06:52 UTC
[Btrfs-devel][PATCH]Add customized find_free_extent support to btrfs-progs
Hello,
This patch adds customized find_free_extent support to btrfs-progs,
the conversion program requires this.
The attachment is the ext3 to btrfs conversion program. it can be
compiled by add following two line to btrfs-progs's Makefile.
convert: $(objects) convert.o utils.o
gcc $(CFLAGS) -o convert $(objects) convert.o utils.o -luuid -lext2fs
$(LDFLAGS)
Regards
YZ
----
diff -ur a/ctree.h b/ctree.h
--- a/ctree.h 2008-01-04 13:36:25.000000000 +0800
+++ b/ctree.h 2008-01-04 13:28:44.000000000 +0800
@@ -299,6 +299,13 @@
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];
struct btrfs_root *fs_root;
@@ -322,6 +329,9 @@
struct mutex fs_mutex;
int fp;
u64 total_pinned;
+
+ struct btrfs_extent_ops *extent_ops;
+ void *priv_data;
};
/*
diff -ur a/disk-io.c b/disk-io.c
--- a/disk-io.c 2008-01-04 14:43:44.000000000 +0800
+++ b/disk-io.c 2008-01-04 13:29:09.000000000 +0800
@@ -396,6 +397,8 @@
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);
diff -ur a/extent-tree.c b/extent-tree.c
--- a/extent-tree.c 2008-01-04 13:14:16.000000000 +0800
+++ b/extent-tree.c 2008-01-04 13:08:39.000000000 +0800
@@ -1209,6 +1209,7 @@
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;
@@ -1274,9 +1275,12 @@
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 +1630,7 @@
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;
@@ -1639,10 +1644,14 @@
*/
WARN_ON(num_bytes < root->sectorsize);
- ret = find_free_extent(trans, root, num_bytes, empty_size,
- search_start, search_end, hint_byte, ins,
- trans->alloc_exclude_start,
- trans->alloc_exclude_nr, data);
+ 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,
+ trans->alloc_exclude_nr, data);
+ }
BUG_ON(ret);
if (ret)
return ret;
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