1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Copyright (C) 2011 STRATO AG
 4 * written by Arne Jansen <sensille@gmx.net>
 5 */
 6
 7#ifndef BTRFS_ULIST_H
 8#define BTRFS_ULIST_H
 9
10#include <linux/list.h>
11#include <linux/rbtree.h>
12
13/*
14 * ulist is a generic data structure to hold a collection of unique u64
15 * values. The only operations it supports is adding to the list and
16 * enumerating it.
17 * It is possible to store an auxiliary value along with the key.
18 *
19 */
20struct ulist_iterator {
21	struct list_head *cur_list;  /* hint to start search */
22};
23
24/*
25 * element of the list
26 */
27struct ulist_node {
28	u64 val;		/* value to store */
29	u64 aux;		/* auxiliary value saved along with the val */
30
31	struct list_head list;  /* used to link node */
32	struct rb_node rb_node;	/* used to speed up search */
33};
34
35struct ulist {
36	/*
37	 * number of elements stored in list
38	 */
39	unsigned long nnodes;
40
41	struct list_head nodes;
42	struct rb_root root;
43};
44
45void ulist_init(struct ulist *ulist);
46void ulist_release(struct ulist *ulist);
47void ulist_reinit(struct ulist *ulist);
48struct ulist *ulist_alloc(gfp_t gfp_mask);
49void ulist_free(struct ulist *ulist);
50int ulist_add(struct ulist *ulist, u64 val, u64 aux, gfp_t gfp_mask);
51int ulist_add_merge(struct ulist *ulist, u64 val, u64 aux,
52		    u64 *old_aux, gfp_t gfp_mask);
53int ulist_del(struct ulist *ulist, u64 val, u64 aux);
54
55/* just like ulist_add_merge() but take a pointer for the aux data */
56static inline int ulist_add_merge_ptr(struct ulist *ulist, u64 val, void *aux,
57				      void **old_aux, gfp_t gfp_mask)
58{
59#if BITS_PER_LONG == 32
60	u64 old64 = (uintptr_t)*old_aux;
61	int ret = ulist_add_merge(ulist, val, (uintptr_t)aux, &old64, gfp_mask);
62	*old_aux = (void *)((uintptr_t)old64);
63	return ret;
64#else
65	return ulist_add_merge(ulist, val, (u64)aux, (u64 *)old_aux, gfp_mask);
66#endif
67}
68
69struct ulist_node *ulist_next(const struct ulist *ulist,
70			      struct ulist_iterator *uiter);
71
72#define ULIST_ITER_INIT(uiter) ((uiter)->cur_list = NULL)
73
74#endif

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Copyright (C) 2011 STRATO AG
 4 * written by Arne Jansen <sensille@gmx.net>
 5 */
 6
 7#ifndef BTRFS_ULIST_H
 8#define BTRFS_ULIST_H
 9
10#include <linux/list.h>
11#include <linux/rbtree.h>
12
13/*
14 * ulist is a generic data structure to hold a collection of unique u64
15 * values. The only operations it supports is adding to the list and
16 * enumerating it.
17 * It is possible to store an auxiliary value along with the key.
18 *
19 */
20struct ulist_iterator {
21	struct list_head *cur_list;  /* hint to start search */
22};
23
24/*
25 * element of the list
26 */
27struct ulist_node {
28	u64 val;		/* value to store */
29	u64 aux;		/* auxiliary value saved along with the val */
30
31	struct list_head list;  /* used to link node */
32	struct rb_node rb_node;	/* used to speed up search */
33};
34
35struct ulist {
36	/*
37	 * number of elements stored in list
38	 */
39	unsigned long nnodes;
40
41	struct list_head nodes;
42	struct rb_root root;
43};
44
45void ulist_init(struct ulist *ulist);
46void ulist_release(struct ulist *ulist);
47void ulist_reinit(struct ulist *ulist);
48struct ulist *ulist_alloc(gfp_t gfp_mask);
49void ulist_free(struct ulist *ulist);
50int ulist_add(struct ulist *ulist, u64 val, u64 aux, gfp_t gfp_mask);
51int ulist_add_merge(struct ulist *ulist, u64 val, u64 aux,
52		    u64 *old_aux, gfp_t gfp_mask);
53int ulist_del(struct ulist *ulist, u64 val, u64 aux);
54
55/* just like ulist_add_merge() but take a pointer for the aux data */
56static inline int ulist_add_merge_ptr(struct ulist *ulist, u64 val, void *aux,
57				      void **old_aux, gfp_t gfp_mask)
58{
59#if BITS_PER_LONG == 32
60	u64 old64 = (uintptr_t)*old_aux;
61	int ret = ulist_add_merge(ulist, val, (uintptr_t)aux, &old64, gfp_mask);
62	*old_aux = (void *)((uintptr_t)old64);
63	return ret;
64#else
65	return ulist_add_merge(ulist, val, (u64)aux, (u64 *)old_aux, gfp_mask);
66#endif
67}
68
69struct ulist_node *ulist_next(struct ulist *ulist,
70			      struct ulist_iterator *uiter);
71
72#define ULIST_ITER_INIT(uiter) ((uiter)->cur_list = NULL)
73
74#endif