Release 4.7 fs/btrfs/ulist.h

/*
 * Copyright (C) 2011 STRATO AG
 * written by Arne Jansen <sensille@gmx.net>
 * Distributed under the GNU GPL license version 2.
 *
 */

#ifndef __ULIST__

#define __ULIST__

#include <linux/list.h>
#include <linux/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 {
#ifdef CONFIG_BTRFS_DEBUG
	
int i;
#endif
	
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 */

#ifdef CONFIG_BTRFS_DEBUG
	
int seqnum;		/* sequence number this node is added */
#endif

	
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
}

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struct ulist_node *ulist_next(struct ulist *ulist,
			      struct ulist_iterator *uiter);


#define ULIST_ITER_INIT(uiter) ((uiter)->cur_list = NULL)

#endif
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wang shilong
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jan schmidt
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qu wenruo
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alexander block
alexander block
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daniel j blueman
daniel j blueman
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chris mason
chris mason
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