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Btrfs: cleanup backref search commit root flag stuff 

Looking into this backref problem I noticed we're using a macro to what turns
out to essentially be a NULL check to see if we need to search the commit root.
I'm killing this, let's just do what everybody else does and checks if trans ==
NULL.  I've also made it so we pass in the path to __resolve_indirect_refs which
will have the search_commit_root flag set properly already and that way we can
avoid allocating another path when we have a perfectly good one to use.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik 2013-06-12 16:20:08 -04:00
parent d88d46c6e0
commit da61d31a78
2 changed files with 16 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
fs/btrfs/backref.c
View File

@ -255,13 +255,11 @@ static int add_all_parents(struct btrfs_root *root, struct btrfs_path *path,
* to a logical address
*/
static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
int search_commit_root,
u64 time_seq,
struct __prelim_ref *ref,
struct ulist *parents,
const u64 *extent_item_pos)
struct btrfs_path *path, u64 time_seq,
struct __prelim_ref *ref,
struct ulist *parents,
const u64 *extent_item_pos)
{
struct btrfs_path *path;
struct btrfs_root *root;
struct btrfs_key root_key;
struct extent_buffer *eb;
@ -269,11 +267,6 @@ static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
int root_level;
int level = ref->level;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->search_commit_root = !!search_commit_root;
root_key.objectid = ref->root_id;
root_key.type = BTRFS_ROOT_ITEM_KEY;
root_key.offset = (u64)-1;
@ -314,7 +307,8 @@ static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
time_seq, ref->wanted_disk_byte,
extent_item_pos);
out:
btrfs_free_path(path);
path->lowest_level = 0;
btrfs_release_path(path);
return ret;
}
@ -322,7 +316,7 @@ out:
* resolve all indirect backrefs from the list
*/
static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
int search_commit_root, u64 time_seq,
struct btrfs_path *path, u64 time_seq,
struct list_head *head,
const u64 *extent_item_pos)
{
@ -349,9 +343,8 @@ static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
continue;
if (ref->count == 0)
continue;
err = __resolve_indirect_ref(fs_info, search_commit_root,
time_seq, ref, parents,
extent_item_pos);
err = __resolve_indirect_ref(fs_info, path, time_seq, ref,
parents, extent_item_pos);
if (err == -ENOMEM)
goto out;
if (err)
@ -795,7 +788,6 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
struct btrfs_delayed_ref_head *head;
int info_level = 0;
int ret;
int search_commit_root = (trans == BTRFS_BACKREF_SEARCH_COMMIT_ROOT);
struct list_head prefs_delayed;
struct list_head prefs;
struct __prelim_ref *ref;
@ -810,7 +802,8 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->search_commit_root = !!search_commit_root;
if (!trans)
path->search_commit_root = 1;
/*
* grab both a lock on the path and a lock on the delayed ref head.
@ -825,7 +818,7 @@ again:
goto out;
BUG_ON(ret == 0);
if (trans != BTRFS_BACKREF_SEARCH_COMMIT_ROOT) {
if (trans) {
/*
* look if there are updates for this ref queued and lock the
* head
@ -890,8 +883,8 @@ again:
__merge_refs(&prefs, 1);
ret = __resolve_indirect_refs(fs_info, search_commit_root, time_seq,
&prefs, extent_item_pos);
ret = __resolve_indirect_refs(fs_info, path, time_seq, &prefs,
extent_item_pos);
if (ret)
goto out;
@ -1459,7 +1452,7 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
iterate_extent_inodes_t *iterate, void *ctx)
{
int ret;
struct btrfs_trans_handle *trans;
struct btrfs_trans_handle *trans = NULL;
struct ulist *refs = NULL;
struct ulist *roots = NULL;
struct ulist_node *ref_node = NULL;
@ -1471,9 +1464,7 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
pr_debug("resolving all inodes for extent %llu\n",
extent_item_objectid);
if (search_commit_root) {
trans = BTRFS_BACKREF_SEARCH_COMMIT_ROOT;
} else {
if (!search_commit_root) {
trans = btrfs_join_transaction(fs_info->extent_root);
if (IS_ERR(trans))
return PTR_ERR(trans);

2
fs/btrfs/backref.h
View File

@ -23,8 +23,6 @@
#include "ulist.h"
#include "extent_io.h"
#define BTRFS_BACKREF_SEARCH_COMMIT_ROOT ((struct btrfs_trans_handle *)0)
struct inode_fs_paths {
struct btrfs_path *btrfs_path;
struct btrfs_root *fs_root;