3301958b7c
We must build up the inode list with the extent lock held after following indirect refs. This also requires an extension to ulists, which allows to modify the stored aux value in case a key already exists in the list. Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
78 lines
1.9 KiB
C
78 lines
1.9 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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/*
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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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* The implementation is preliminary and can probably be sped up
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* significantly. A first step would be to store the values in an rbtree
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* as soon as ULIST_SIZE is exceeded.
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*/
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/*
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* number of elements statically allocated inside struct ulist
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*/
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#define ULIST_SIZE 16
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struct ulist_iterator {
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int i;
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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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unsigned long aux; /* auxiliary value saved along with the val */
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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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/*
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* number of nodes we already have room for
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*/
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unsigned long nodes_alloced;
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/*
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* pointer to the array storing the elements. The first ULIST_SIZE
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* elements are stored inline. In this case the it points to int_nodes.
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* After exceeding ULIST_SIZE, dynamic memory is allocated.
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*/
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struct ulist_node *nodes;
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/*
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* inline storage space for the first ULIST_SIZE entries
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*/
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struct ulist_node int_nodes[ULIST_SIZE];
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};
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void ulist_init(struct ulist *ulist);
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void ulist_fini(struct ulist *ulist);
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void ulist_reinit(struct ulist *ulist);
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struct ulist *ulist_alloc(unsigned long gfp_mask);
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void ulist_free(struct ulist *ulist);
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int ulist_add(struct ulist *ulist, u64 val, unsigned long aux,
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unsigned long gfp_mask);
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int ulist_add_merge(struct ulist *ulist, u64 val, unsigned long aux,
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unsigned long *old_aux, unsigned long gfp_mask);
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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)->i = 0)
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#endif
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