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Btrfs: optimize to remove unnecessary removal with ulist reallocation

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Here we are not going to free memory, no need to remove every node
one by one, just init root node here is ok.

Cc:  Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Wang Shilong 2014-01-10 21:25:46 +08:00 committed by Chris Mason
parent de6e820066
commit f499e40fd9
1 changed files with 1 additions and 3 deletions
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4
fs/btrfs/ulist.c
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@ -207,9 +207,6 @@ int ulist_add_merge(struct ulist *ulist, u64 val, u64 aux,
void *old = NULL;
int i;
for (i = 0; i < ulist->nnodes; i++)
rb_erase(&ulist->nodes[i].rb_node, &ulist->root);
/*
* if nodes_alloced == ULIST_SIZE no memory has been allocated
* yet, so pass NULL to krealloc
@ -234,6 +231,7 @@ int ulist_add_merge(struct ulist *ulist, u64 val, u64 aux,
* pointers, so we have to do it ourselves. Otherwise we may
* be bitten by crashes.
*/
ulist->root = RB_ROOT;
for (i = 0; i < ulist->nnodes; i++) {
ret = ulist_rbtree_insert(ulist, &ulist->nodes[i]);
if (ret < 0)