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Btrfs: Insert extent record and the first backref in a single balance 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-02-01 14:51:59 -05:00
parent 80ea96b1f3
commit 47e4bb988c
1 changed files with 29 additions and 11 deletions
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40
fs/btrfs/extent-tree.c
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@ -1664,12 +1664,13 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
u64 root_used;
u64 search_start = 0;
u64 new_hint;
u32 sizes[2];
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_root *extent_root = info->extent_root;
struct btrfs_extent_item extent_item;
struct btrfs_extent_item *extent_item;
struct btrfs_extent_ref *ref;
struct btrfs_path *path;
btrfs_set_stack_extent_refs(&extent_item, 1);
struct btrfs_key keys[2];
new_hint = max(hint_byte, root->fs_info->alloc_start);
if (new_hint < btrfs_super_total_bytes(&info->super_copy))
@ -1707,20 +1708,37 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
WARN_ON(trans->alloc_exclude_nr);
trans->alloc_exclude_start = ins->objectid;
trans->alloc_exclude_nr = ins->offset;
ret = btrfs_insert_item(trans, extent_root, ins, &extent_item,
sizeof(extent_item));
trans->alloc_exclude_start = 0;
trans->alloc_exclude_nr = 0;
BUG_ON(ret);
memcpy(&keys[0], ins, sizeof(*ins));
keys[1].offset = hash_extent_ref(root_objectid, ref_generation,
owner, owner_offset);
keys[1].objectid = ins->objectid;
keys[1].type = BTRFS_EXTENT_REF_KEY;
sizes[0] = sizeof(*extent_item);
sizes[1] = sizeof(*ref);
path = btrfs_alloc_path();
BUG_ON(!path);
ret = btrfs_insert_extent_backref(trans, extent_root, path,
ins->objectid, root_objectid,
ref_generation, owner, owner_offset);
ret = btrfs_insert_empty_items(trans, extent_root, path, keys,
sizes, 2);
BUG_ON(ret);
extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_extent_item);
btrfs_set_extent_refs(path->nodes[0], extent_item, 1);
ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
struct btrfs_extent_ref);
btrfs_set_ref_root(path->nodes[0], ref, root_objectid);
btrfs_set_ref_generation(path->nodes[0], ref, ref_generation);
btrfs_set_ref_objectid(path->nodes[0], ref, owner);
btrfs_set_ref_offset(path->nodes[0], ref, owner_offset);
btrfs_mark_buffer_dirty(path->nodes[0]);
trans->alloc_exclude_start = 0;
trans->alloc_exclude_nr = 0;
btrfs_free_path(path);
finish_current_insert(trans, extent_root);
pending_ret = del_pending_extents(trans, extent_root);