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authorNikolay Borisov <nborisov@suse.com>2018-06-18 14:13:19 +0300
committerDavid Sterba <dsterba@suse.com>2018-08-06 14:12:38 +0300
commitbc877d285ca3dba24c52406946a4a69847cc7422 (patch)
treef7d9439fb1887bd693bde80d9e7ffdf170910a14 /fs/btrfs/ctree.c
parent9912bbf6440ba0555e91d3306520da01872c7c1d (diff)
downloadlinux-bc877d285ca3dba24c52406946a4a69847cc7422.tar.xz
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>
Diffstat (limited to 'fs/btrfs/ctree.c')
-rw-r--r--fs/btrfs/ctree.c29
1 files changed, 1 insertions, 28 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 18fd80e2f278..18f1ca1c5bd9 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -3358,17 +3358,7 @@ static noinline int insert_new_root(struct btrfs_trans_handle *trans,
root_add_used(root, fs_info->nodesize);
- memzero_extent_buffer(c, 0, sizeof(struct btrfs_header));
btrfs_set_header_nritems(c, 1);
- btrfs_set_header_level(c, level);
- btrfs_set_header_bytenr(c, c->start);
- btrfs_set_header_generation(c, trans->transid);
- btrfs_set_header_backref_rev(c, BTRFS_MIXED_BACKREF_REV);
- btrfs_set_header_owner(c, root->root_key.objectid);
-
- write_extent_buffer_fsid(c, fs_info->fsid);
- write_extent_buffer_chunk_tree_uuid(c, fs_info->chunk_tree_uuid);
-
btrfs_set_node_key(c, &lower_key, 0);
btrfs_set_node_blockptr(c, 0, lower->start);
lower_gen = btrfs_header_generation(lower);
@@ -3497,15 +3487,7 @@ static noinline int split_node(struct btrfs_trans_handle *trans,
return PTR_ERR(split);
root_add_used(root, fs_info->nodesize);
-
- memzero_extent_buffer(split, 0, sizeof(struct btrfs_header));
- btrfs_set_header_level(split, btrfs_header_level(c));
- btrfs_set_header_bytenr(split, split->start);
- btrfs_set_header_generation(split, trans->transid);
- btrfs_set_header_backref_rev(split, BTRFS_MIXED_BACKREF_REV);
- btrfs_set_header_owner(split, root->root_key.objectid);
- write_extent_buffer_fsid(split, fs_info->fsid);
- write_extent_buffer_chunk_tree_uuid(split, fs_info->chunk_tree_uuid);
+ ASSERT(btrfs_header_level(c) == level);
ret = tree_mod_log_eb_copy(fs_info, split, c, 0, mid, c_nritems - mid);
if (ret) {
@@ -4291,15 +4273,6 @@ again:
root_add_used(root, fs_info->nodesize);
- memzero_extent_buffer(right, 0, sizeof(struct btrfs_header));
- btrfs_set_header_bytenr(right, right->start);
- btrfs_set_header_generation(right, trans->transid);
- btrfs_set_header_backref_rev(right, BTRFS_MIXED_BACKREF_REV);
- btrfs_set_header_owner(right, root->root_key.objectid);
- btrfs_set_header_level(right, 0);
- write_extent_buffer_fsid(right, fs_info->fsid);
- write_extent_buffer_chunk_tree_uuid(right, fs_info->chunk_tree_uuid);
-
if (split == 0) {
if (mid <= slot) {
btrfs_set_header_nritems(right, 0);