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d4b8040459
This function will delete unode with given (val,aux) pair. And with this patch, seqnum for debug usage doesn't have any meaning now, so remove them. This is used by later patches to skip snapshot root. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/*
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* Copyright (C) 2011 STRATO AG
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* written by Arne Jansen <sensille@gmx.net>
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* Distributed under the GNU GPL license version 2.
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*
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*/
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#ifndef __ULIST__
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#define __ULIST__
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#include <linux/list.h>
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#include <linux/rbtree.h>
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/*
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* ulist is a generic data structure to hold a collection of unique u64
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* values. The only operations it supports is adding to the list and
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* enumerating it.
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* It is possible to store an auxiliary value along with the key.
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*
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*/
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struct ulist_iterator {
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#ifdef CONFIG_BTRFS_DEBUG
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int i;
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#endif
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struct list_head *cur_list; /* hint to start search */
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};
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/*
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* element of the list
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*/
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struct ulist_node {
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u64 val; /* value to store */
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u64 aux; /* auxiliary value saved along with the val */
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#ifdef CONFIG_BTRFS_DEBUG
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int seqnum; /* sequence number this node is added */
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#endif
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struct list_head list; /* used to link node */
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struct rb_node rb_node; /* used to speed up search */
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};
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struct ulist {
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/*
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* number of elements stored in list
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*/
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unsigned long nnodes;
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struct list_head nodes;
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struct rb_root root;
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};
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void ulist_init(struct ulist *ulist);
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void ulist_reinit(struct ulist *ulist);
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struct ulist *ulist_alloc(gfp_t gfp_mask);
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void ulist_free(struct ulist *ulist);
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int ulist_add(struct ulist *ulist, u64 val, u64 aux, gfp_t gfp_mask);
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int ulist_add_merge(struct ulist *ulist, u64 val, u64 aux,
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u64 *old_aux, gfp_t gfp_mask);
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int ulist_del(struct ulist *ulist, u64 val, u64 aux);
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/* just like ulist_add_merge() but take a pointer for the aux data */
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static inline int ulist_add_merge_ptr(struct ulist *ulist, u64 val, void *aux,
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void **old_aux, gfp_t gfp_mask)
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{
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#if BITS_PER_LONG == 32
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u64 old64 = (uintptr_t)*old_aux;
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int ret = ulist_add_merge(ulist, val, (uintptr_t)aux, &old64, gfp_mask);
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*old_aux = (void *)((uintptr_t)old64);
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return ret;
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#else
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return ulist_add_merge(ulist, val, (u64)aux, (u64 *)old_aux, gfp_mask);
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#endif
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}
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struct ulist_node *ulist_next(struct ulist *ulist,
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struct ulist_iterator *uiter);
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#define ULIST_ITER_INIT(uiter) ((uiter)->cur_list = NULL)
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#endif
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