139 lines
4.3 KiB
C
139 lines
4.3 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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#include "los_mux.h"
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#include "vnode.h"
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#include "fs/mount.h"
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#define VNODE_HASH_BUCKETS 128
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LIST_HEAD g_vnodeHashEntrys[VNODE_HASH_BUCKETS];
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uint32_t g_vnodeHashMask = VNODE_HASH_BUCKETS - 1;
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uint32_t g_vnodeHashSize = VNODE_HASH_BUCKETS;
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static LosMux g_vnodeHashMux;
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int VnodeHashInit(void)
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{
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int ret;
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for (int i = 0; i < g_vnodeHashSize; i++) {
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LOS_ListInit(&g_vnodeHashEntrys[i]);
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}
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ret = LOS_MuxInit(&g_vnodeHashMux, NULL);
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if (ret != LOS_OK) {
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PRINT_ERR("Create mutex for vnode hash list fail, status: %d", ret);
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return ret;
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}
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return LOS_OK;
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}
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void VnodeHashDump(void)
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{
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PRINTK("-------->VnodeHashDump in\n");
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(void)LOS_MuxLock(&g_vnodeHashMux, LOS_WAIT_FOREVER);
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for (int i = 0; i < g_vnodeHashSize; i++) {
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LIST_HEAD *nhead = &g_vnodeHashEntrys[i];
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struct Vnode *node = NULL;
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LOS_DL_LIST_FOR_EACH_ENTRY(node, nhead, struct Vnode, hashEntry) {
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PRINTK(" vnode dump: col %d item %p\n", i, node);
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}
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}
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(void)LOS_MuxUnlock(&g_vnodeHashMux);
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PRINTK("-------->VnodeHashDump out\n");
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}
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uint32_t VfsHashIndex(struct Vnode *vnode)
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{
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if (vnode == NULL) {
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return -EINVAL;
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}
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return (vnode->hash + vnode->originMount->hashseed);
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}
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static LOS_DL_LIST *VfsHashBucket(const struct Mount *mp, uint32_t hash)
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{
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return (&g_vnodeHashEntrys[(hash + mp->hashseed) & g_vnodeHashMask]);
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}
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int VfsHashGet(const struct Mount *mount, uint32_t hash, struct Vnode **vnode, VfsHashCmp *fn, void *arg)
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{
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struct Vnode *curVnode = NULL;
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if (mount == NULL || vnode == NULL) {
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return -EINVAL;
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}
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(void)LOS_MuxLock(&g_vnodeHashMux, LOS_WAIT_FOREVER);
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LOS_DL_LIST *list = VfsHashBucket(mount, hash);
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LOS_DL_LIST_FOR_EACH_ENTRY(curVnode, list, struct Vnode, hashEntry) {
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if (curVnode->hash != hash) {
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continue;
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}
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if (curVnode->originMount != mount) {
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continue;
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}
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if (fn != NULL && fn(curVnode, arg)) {
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continue;
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}
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(void)LOS_MuxUnlock(&g_vnodeHashMux);
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*vnode = curVnode;
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return LOS_OK;
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}
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(void)LOS_MuxUnlock(&g_vnodeHashMux);
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*vnode = NULL;
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return LOS_NOK;
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}
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void VfsHashRemove(struct Vnode *vnode)
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{
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if (vnode == NULL) {
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return;
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}
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(void)LOS_MuxLock(&g_vnodeHashMux, LOS_WAIT_FOREVER);
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LOS_ListDelete(&vnode->hashEntry);
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(void)LOS_MuxUnlock(&g_vnodeHashMux);
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}
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int VfsHashInsert(struct Vnode *vnode, uint32_t hash)
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{
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if (vnode == NULL) {
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return -EINVAL;
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}
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(void)LOS_MuxLock(&g_vnodeHashMux, LOS_WAIT_FOREVER);
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vnode->hash = hash;
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LOS_ListHeadInsert(VfsHashBucket(vnode->originMount, hash), &vnode->hashEntry);
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(void)LOS_MuxUnlock(&g_vnodeHashMux);
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return LOS_OK;
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}
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