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btrfs: Deduplicate extent_buffer init code

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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>
This commit is contained in:
Nikolay Borisov 2018-06-18 14:13:19 +03:00 committed by David Sterba
parent 9912bbf644
commit bc877d285c
4 changed files with 13 additions and 54 deletions
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29
fs/btrfs/ctree.c
View File

@ -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);

14
fs/btrfs/disk-io.c
View File

@ -1292,15 +1292,7 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
goto fail;
}
memzero_extent_buffer(leaf, 0, sizeof(struct btrfs_header));
btrfs_set_header_bytenr(leaf, leaf->start);
btrfs_set_header_generation(leaf, trans->transid);
btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(leaf, objectid);
root->node = leaf;
write_extent_buffer_fsid(leaf, fs_info->fsid);
write_extent_buffer_chunk_tree_uuid(leaf, fs_info->chunk_tree_uuid);
btrfs_mark_buffer_dirty(leaf);
root->commit_root = btrfs_root_node(root);
@ -1374,14 +1366,8 @@ static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
return ERR_CAST(leaf);
}
memzero_extent_buffer(leaf, 0, sizeof(struct btrfs_header));
btrfs_set_header_bytenr(leaf, leaf->start);
btrfs_set_header_generation(leaf, trans->transid);
btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID);
root->node = leaf;
write_extent_buffer_fsid(root->node, fs_info->fsid);
btrfs_mark_buffer_dirty(root->node);
btrfs_tree_unlock(root->node);
return root;

16
fs/btrfs/extent-tree.c
View File

@ -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;

8
fs/btrfs/ioctl.c
View File

@ -616,14 +616,6 @@ static noinline int create_subvol(struct inode *dir,
goto fail;
}
memzero_extent_buffer(leaf, 0, sizeof(struct btrfs_header));
btrfs_set_header_bytenr(leaf, leaf->start);
btrfs_set_header_generation(leaf, trans->transid);
btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
btrfs_set_header_owner(leaf, objectid);
write_extent_buffer_fsid(leaf, fs_info->fsid);
write_extent_buffer_chunk_tree_uuid(leaf, fs_info->chunk_tree_uuid);
btrfs_mark_buffer_dirty(leaf);
inode_item = &root_item->inode;