64 lines
2.8 KiB
C
64 lines
2.8 KiB
C
/*
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* Copyright (c) 2021-2021 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _PATH_CACHE_H
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#define _PATH_CACHE_H
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#include "los_list.h"
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#include "fs/mount.h"
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#include "vnode.h"
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struct PathCache {
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struct Vnode *parentVnode; /* vnode points to the cache */
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struct Vnode *childVnode; /* vnode the cache points to */
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LIST_ENTRY parentEntry; /* list entry for cache list in the parent vnode */
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LIST_ENTRY childEntry; /* list entry for cache list in the child vnode */
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LIST_ENTRY hashEntry; /* list entry for buckets in the hash table */
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uint8_t nameLen; /* length of path component */
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#ifdef LOSCFG_DEBUG_VERSION
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int hit; /* cache hit count*/
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#endif
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char name[0]; /* path component name */
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};
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int PathCacheInit(void);
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int PathCacheFree(struct PathCache *cache);
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struct PathCache *PathCacheAlloc(struct Vnode *parent, struct Vnode *vnode, const char *name, uint8_t len);
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int PathCacheLookup(struct Vnode *parent, const char *name, int len, struct Vnode **vnode);
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void VnodePathCacheFree(struct Vnode *vnode);
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void PathCacheMemoryDump(void);
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void PathCacheDump(void);
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LIST_HEAD* GetPathCacheList(void);
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#ifdef LOSCFG_DEBUG_VERSION
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void ResetPathCacheHitInfo(int *hit, int *try);
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#endif
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#endif /* _PATH_CACHE_H */
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