btrfs: Deduplicate extent_buffer init code
When a new extent buffer is allocated there are a few mandatory fields
which need to be set in order for the buffer to be sane: level,
generation, bytenr, backref_rev, owner and FSID/UUID. Currently this
is open coded in the callers of btrfs_alloc_tree_block, meaning it's
fairly high in the abstraction hierarchy of operations. This patch
solves this by simply moving this init code in btrfs_init_new_buffer,
since this is the function which initializes a newly allocated
extent buffer. No functional changes.
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 472872a..0ca3999 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8302,7 +8302,7 @@ int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
static struct extent_buffer *
btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- u64 bytenr, int level)
+ u64 bytenr, int level, u64 owner)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct extent_buffer *buf;
@@ -8311,7 +8311,6 @@ btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root,
if (IS_ERR(buf))
return buf;
- btrfs_set_header_generation(buf, trans->transid);
btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level);
btrfs_tree_lock(buf);
clean_tree_block(fs_info, buf);
@@ -8320,6 +8319,14 @@ btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root,
btrfs_set_lock_blocking(buf);
set_extent_buffer_uptodate(buf);
+ memzero_extent_buffer(buf, 0, sizeof(struct btrfs_header));
+ btrfs_set_header_level(buf, level);
+ btrfs_set_header_bytenr(buf, buf->start);
+ btrfs_set_header_generation(buf, trans->transid);
+ btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
+ btrfs_set_header_owner(buf, owner);
+ write_extent_buffer_fsid(buf, fs_info->fsid);
+ write_extent_buffer_chunk_tree_uuid(buf, fs_info->chunk_tree_uuid);
if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
buf->log_index = root->log_transid % 2;
/*
@@ -8428,7 +8435,7 @@ struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
if (btrfs_is_testing(fs_info)) {
buf = btrfs_init_new_buffer(trans, root, root->alloc_bytenr,
- level);
+ level, root_objectid);
if (!IS_ERR(buf))
root->alloc_bytenr += blocksize;
return buf;
@@ -8444,7 +8451,8 @@ struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
if (ret)
goto out_unuse;
- buf = btrfs_init_new_buffer(trans, root, ins.objectid, level);
+ buf = btrfs_init_new_buffer(trans, root, ins.objectid, level,
+ root_objectid);
if (IS_ERR(buf)) {
ret = PTR_ERR(buf);
goto out_free_reserved;