1 /* 2 * Copyright (c) 2021-2021 Huawei Device Co., Ltd. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without modification, 5 * are permitted provided that the following conditions are met: 6 * 7 * 1. Redistributions of source code must retain the above copyright notice, this list of 8 * conditions and the following disclaimer. 9 * 10 * 2. Redistributions in binary form must reproduce the above copyright notice, this list 11 * of conditions and the following disclaimer in the documentation and/or other materials 12 * provided with the distribution. 13 * 14 * 3. Neither the name of the copyright holder nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific prior written 16 * permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 22 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef _PATH_CACHE_H 32 #define _PATH_CACHE_H 33 34 #include "los_list.h" 35 #include "fs/mount.h" 36 #include "vnode.h" 37 38 struct PathCache { 39 struct Vnode *parentVnode; /* vnode points to the cache */ 40 struct Vnode *childVnode; /* vnode the cache points to */ 41 LIST_ENTRY parentEntry; /* list entry for cache list in the parent vnode */ 42 LIST_ENTRY childEntry; /* list entry for cache list in the child vnode */ 43 LIST_ENTRY hashEntry; /* list entry for buckets in the hash table */ 44 uint8_t nameLen; /* length of path component */ 45 #ifdef LOSCFG_DEBUG_VERSION 46 int hit; /* cache hit count */ 47 #endif 48 char name[0]; /* path component name */ 49 }; 50 51 int PathCacheInit(void); 52 int PathCacheFree(struct PathCache *cache); 53 struct PathCache *PathCacheAlloc(struct Vnode *parent, struct Vnode *vnode, const char *name, uint8_t len); 54 int PathCacheLookup(struct Vnode *parent, const char *name, int len, struct Vnode **vnode); 55 void VnodePathCacheFree(struct Vnode *vnode); 56 void PathCacheMemoryDump(void); 57 void PathCacheDump(void); 58 LIST_HEAD* GetPathCacheList(void); 59 #ifdef LOSCFG_DEBUG_VERSION 60 void ResetPathCacheHitInfo(int *hit, int *try); 61 #endif 62 63 #endif /* _PATH_CACHE_H */ 64