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Btrfs: cleanup delayed-ref.c:find_ref_head()

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The argument last wasn't used, all callers supplied a NULL value
for it. Also removed unnecessary intermediate storage of the result
of key comparisons.

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
This commit is contained in:
Filipe Manana 2014-02-12 15:07:53 +00:00 • committed by Josef Bacik
parent 6103fb43fb
commit 85fdfdf611
1 changed files with 6 additions and 18 deletions
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24
fs/btrfs/delayed-ref.c
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@ -199,42 +199,30 @@ static struct btrfs_delayed_ref_head *htree_insert(struct rb_root *root,
*/ */
static struct btrfs_delayed_ref_head * static struct btrfs_delayed_ref_head *
find_ref_head(struct rb_root *root, u64 bytenr, find_ref_head(struct rb_root *root, u64 bytenr,
struct btrfs_delayed_ref_head **last, int return_bigger) int return_bigger)
{ {
struct rb_node *n; struct rb_node *n;
struct btrfs_delayed_ref_head *entry; struct btrfs_delayed_ref_head *entry;
int cmp = 0;
n = root->rb_node; n = root->rb_node;
entry = NULL; entry = NULL;
while (n) { while (n) {
entry = rb_entry(n, struct btrfs_delayed_ref_head, href_node); entry = rb_entry(n, struct btrfs_delayed_ref_head, href_node);
if (last)
*last = entry;
if (bytenr < entry->node.bytenr) if (bytenr < entry->node.bytenr)
cmp = -1;
else if (bytenr > entry->node.bytenr)
cmp = 1;
else
cmp = 0;
if (cmp < 0)
n = n->rb_left; n = n->rb_left;
else if (cmp > 0) else if (bytenr > entry->node.bytenr)
n = n->rb_right; n = n->rb_right;
else else
return entry; return entry;
} }
if (entry && return_bigger) { if (entry && return_bigger) {
if (cmp > 0) { if (bytenr > entry->node.bytenr) {
n = rb_next(&entry->href_node); n = rb_next(&entry->href_node);
if (!n) if (!n)
n = rb_first(root); n = rb_first(root);
entry = rb_entry(n, struct btrfs_delayed_ref_head, entry = rb_entry(n, struct btrfs_delayed_ref_head,
href_node); href_node);
if (last)
*last = entry;
return entry; return entry;
} }
return entry; return entry;
@ -414,12 +402,12 @@ btrfs_select_ref_head(struct btrfs_trans_handle *trans)
again: again:
start = delayed_refs->run_delayed_start; start = delayed_refs->run_delayed_start;
head = find_ref_head(&delayed_refs->href_root, start, NULL, 1); head = find_ref_head(&delayed_refs->href_root, start, 1);
if (!head && !loop) { if (!head && !loop) {
delayed_refs->run_delayed_start = 0; delayed_refs->run_delayed_start = 0;
start = 0; start = 0;
loop = true; loop = true;
head = find_ref_head(&delayed_refs->href_root, start, NULL, 1); head = find_ref_head(&delayed_refs->href_root, start, 1);
if (!head) if (!head)
return NULL; return NULL;
} else if (!head && loop) { } else if (!head && loop) {
@ -897,7 +885,7 @@ btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64 bytenr)
struct btrfs_delayed_ref_root *delayed_refs; struct btrfs_delayed_ref_root *delayed_refs;
delayed_refs = &trans->transaction->delayed_refs; delayed_refs = &trans->transaction->delayed_refs;
return find_ref_head(&delayed_refs->href_root, bytenr, NULL, 0); return find_ref_head(&delayed_refs->href_root, bytenr, 0);
} }
void btrfs_delayed_ref_exit(void) void btrfs_delayed_ref_exit(void)