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btrfs: replace hardcoded value with SEQ_LAST macro 

Define the SEQ_LAST macro to replace (u64)-1 in places where said
value triggers a special-case ref search behavior.

Signed-off-by: Edmund Nadolski <enadolski@suse.com>
Reviewed-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Edmund Nadolski 2017-03-16 10:04:34 -06:00 committed by David Sterba
parent f58d88b336
commit de47c9d3ff
3 changed files with 12 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
fs/btrfs/backref.c
View File

@ -538,7 +538,7 @@ static int add_all_parents(struct btrfs_root *root, struct btrfs_path *path,
* slot==nritems. In that case, go to the next leaf before we continue.
*/
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
if (time_seq == (u64)-1)
if (time_seq == SEQ_LAST)
ret = btrfs_next_leaf(root, path);
else
ret = btrfs_next_old_leaf(root, path, time_seq);
@ -582,7 +582,7 @@ static int add_all_parents(struct btrfs_root *root, struct btrfs_path *path,
eie = NULL;
}
next:
if (time_seq == (u64)-1)
if (time_seq == SEQ_LAST)
ret = btrfs_next_item(root, path);
else
ret = btrfs_next_old_item(root, path, time_seq);
@ -634,7 +634,7 @@ static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
if (path->search_commit_root)
root_level = btrfs_header_level(root->commit_root);
else if (time_seq == (u64)-1)
else if (time_seq == SEQ_LAST)
root_level = btrfs_header_level(root->node);
else
root_level = btrfs_old_root_level(root, time_seq);
@ -645,7 +645,7 @@ static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
}
path->lowest_level = level;
if (time_seq == (u64)-1)
if (time_seq == SEQ_LAST)
ret = btrfs_search_slot(NULL, root, &ref->key_for_search, path,
0, 0);
else
@ -1199,7 +1199,7 @@ static int __add_keyed_refs(struct btrfs_fs_info *fs_info,
*
* NOTE: This can return values > 0
*
* If time_seq is set to (u64)-1, it will not search delayed_refs, and behave
* If time_seq is set to SEQ_LAST, it will not search delayed_refs, and behave
* much like trans == NULL case, the difference only lies in it will not
* commit root.
* The special case is for qgroup to search roots in commit_transaction().
@ -1246,7 +1246,7 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
path->skip_locking = 1;
}
if (time_seq == (u64)-1)
if (time_seq == SEQ_LAST)
path->skip_locking = 1;
/*
@ -1276,9 +1276,9 @@ again:
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
if (trans && likely(trans->type != __TRANS_DUMMY) &&
time_seq != (u64)-1) {
time_seq != SEQ_LAST) {
#else
if (trans && time_seq != (u64)-1) {
if (trans && time_seq != SEQ_LAST) {
#endif
/*
* look if there are updates for this ref queued and lock the

2
fs/btrfs/ctree.h
View File

@ -659,6 +659,8 @@ struct seq_list {
#define SEQ_LIST_INIT(name) { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
#define SEQ_LAST ((u64)-1)
enum btrfs_orphan_cleanup_state {
ORPHAN_CLEANUP_STARTED = 1,
ORPHAN_CLEANUP_DONE = 2,

4
fs/btrfs/qgroup.c
View File

@ -2055,12 +2055,12 @@ int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans,
if (!ret) {
/*
* Use (u64)-1 as time_seq to do special search, which
* Use SEQ_LAST as time_seq to do special search, which
* doesn't lock tree or delayed_refs and search current
* root. It's safe inside commit_transaction().
*/
ret = btrfs_find_all_roots(trans, fs_info,
record->bytenr, (u64)-1, &new_roots);
record->bytenr, SEQ_LAST, &new_roots);
if (ret < 0)
goto cleanup;
if (qgroup_to_skip)