mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-13 09:57:03 +00:00
c3ee6a8a09
Add the GPL v2 header to files where it was missing and is not from an external source, update to the most recent version with the address. Signed-off-by: David Sterba <dsterba@suse.com>
89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/*
|
|
* Copyright (C) 2011 STRATO AG
|
|
* written by Arne Jansen <sensille@gmx.net>
|
|
* Distributed under the GNU GPL license version 2.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License v2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this program; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
#ifndef __ULIST_H__
|
|
#define __ULIST_H__
|
|
|
|
#include "kerncompat.h"
|
|
#include "kernel-lib/list.h"
|
|
#include "kernel-lib/rbtree.h"
|
|
|
|
/*
|
|
* ulist is a generic data structure to hold a collection of unique u64
|
|
* values. The only operations it supports is adding to the list and
|
|
* enumerating it.
|
|
* It is possible to store an auxiliary value along with the key.
|
|
*
|
|
*/
|
|
struct ulist_iterator {
|
|
struct list_head *cur_list; /* hint to start search */
|
|
};
|
|
|
|
/*
|
|
* element of the list
|
|
*/
|
|
struct ulist_node {
|
|
u64 val; /* value to store */
|
|
u64 aux; /* auxiliary value saved along with the val */
|
|
|
|
struct list_head list; /* used to link node */
|
|
struct rb_node rb_node; /* used to speed up search */
|
|
};
|
|
|
|
struct ulist {
|
|
/*
|
|
* number of elements stored in list
|
|
*/
|
|
unsigned long nnodes;
|
|
|
|
struct list_head nodes;
|
|
struct rb_root root;
|
|
};
|
|
|
|
void ulist_init(struct ulist *ulist);
|
|
void ulist_reinit(struct ulist *ulist);
|
|
struct ulist *ulist_alloc(gfp_t gfp_mask);
|
|
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,
|
|
void **old_aux, gfp_t gfp_mask)
|
|
{
|
|
#if BITS_PER_LONG == 32
|
|
u64 old64 = (uintptr_t)*old_aux;
|
|
int ret = ulist_add_merge(ulist, val, (uintptr_t)aux, &old64, gfp_mask);
|
|
*old_aux = (void *)((uintptr_t)old64);
|
|
return ret;
|
|
#else
|
|
return ulist_add_merge(ulist, val, (u64)aux, (u64 *)old_aux, gfp_mask);
|
|
#endif
|
|
}
|
|
|
|
struct ulist_node *ulist_next(struct ulist *ulist,
|
|
struct ulist_iterator *uiter);
|
|
|
|
#define ULIST_ITER_INIT(uiter) ((uiter)->cur_list = NULL)
|
|
|
|
#endif
|