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btrfs-progs: shared: copy ulist_del from kernel 

Signed-off-by: David Sterba <dsterba@suse.com>
master
David Sterba 2017-02-09 16:16:02 +01:00
parent 886a8565e0
commit 4049542d4f
2 changed files with 37 additions and 0 deletions
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36
kernel-shared/ulist.c
View File

@ -134,6 +134,15 @@ static struct ulist_node *ulist_rbtree_search(struct ulist *ulist, u64 val)
return NULL;
}
static void ulist_rbtree_erase(struct ulist *ulist, struct ulist_node *node)
{
rb_erase(&node->rb_node, &ulist->root);
list_del(&node->list);
kfree(node);
BUG_ON(ulist->nnodes == 0);
ulist->nnodes--;
}
static int ulist_rbtree_insert(struct ulist *ulist, struct ulist_node *ins)
{
struct rb_node **p = &ulist->root.rb_node;
@ -211,6 +220,33 @@ int ulist_add_merge(struct ulist *ulist, u64 val, u64 aux,
return 1;
}
/*
* ulist_del - delete one node from ulist
* @ulist: ulist to remove node from
* @val: value to delete
* @aux: aux to delete
*
* The deletion will only be done when *BOTH* val and aux matches.
* Return 0 for successful delete.
* Return > 0 for not found.
*/
int ulist_del(struct ulist *ulist, u64 val, u64 aux)
{
struct ulist_node *node;
node = ulist_rbtree_search(ulist, val);
/* Not found */
if (!node)
return 1;
if (node->aux != aux)
return 1;
/* Found and delete */
ulist_rbtree_erase(ulist, node);
return 0;
}
/**
* ulist_next - iterate ulist
* @ulist: ulist to iterate

1
kernel-shared/ulist.h
View File

@ -58,6 +58,7 @@ void ulist_free(struct ulist *ulist);
int ulist_add(struct ulist *ulist, u64 val, u64 aux, gfp_t gfp_mask);
int ulist_add_merge(struct ulist *ulist, u64 val, u64 aux,
u64 *old_aux, gfp_t gfp_mask);
int ulist_del(struct ulist *ulist, u64 val, u64 aux);
/* just like ulist_add_merge() but take a pointer for the aux data */
static inline int ulist_add_merge_ptr(struct ulist *ulist, u64 val, void *aux,