459 lines
14 KiB
C
459 lines
14 KiB
C
/*
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* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020-2021 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 "vfs_zpfs.h"
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/statfs.h>
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#include <unistd.h>
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#include "fs/dirent_fs.h"
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#include "inode/inode.h"
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#include "internal.h"
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#include "los_tables.h"
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#include "los_vm_filemap.h"
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#ifdef LOSCFG_FS_ZPFS
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static int CheckEntryExist(const struct ZpfsEntry *zpfsEntry, char **fPath, struct stat *buf)
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{
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int ret;
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struct inode *inode = zpfsEntry->mountedInode;
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const char *path = zpfsEntry->mountedPath;
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const char *relPath = zpfsEntry->mountedRelpath;
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int len = strlen(path) + strlen(relPath) + 1;
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int fullLen = len + 1;
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char *fullPath = (char *)malloc(fullLen);
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if (fullPath == NULL) {
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return -1;
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}
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ret = snprintf_s(fullPath, fullLen, len, "%s/%s", path, relPath);
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if (ret < 0) {
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free(fullPath);
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return -1;
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}
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if (inode->u.i_mops->stat != NULL) {
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ret = inode->u.i_mops->stat(inode, fullPath, buf);
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} else {
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ret = -ENOSYS;
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}
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if (fPath == NULL) {
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free(fullPath);
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} else {
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*fPath = fullPath;
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}
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return ret;
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}
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static struct inode *GetRelInodeFromVInode(const ZpfsConfig *zpfsCfg,
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const char* relPath, struct stat *buf, char **finalPath)
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{
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int ret;
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struct ZpfsEntry entry;
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for (int i = 0; i < zpfsCfg->entryCount; i++) {
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entry.mountedPath = zpfsCfg->orgEntry[i].mountedRelpath;
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entry.mountedRelpath = (char*)relPath;
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entry.mountedInode = zpfsCfg->orgEntry[i].mountedInode;
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ret = CheckEntryExist(&entry, finalPath, buf);
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if (ret == OK) {
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return entry.mountedInode;
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}
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}
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return NULL;
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}
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/****************************************************************************
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* Name: VfsZpfsRealInode
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*
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* Description:
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* Get the inode which is hidden.
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*
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* Input Parameters:
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* The relative path.
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* Returned Value:
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* finalPath the relative path of the mount point.
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* OK
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* NULL memory is not enough.
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****************************************************************************/
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static inline struct inode *VfsZpfsRealInode(const ZpfsConfig *zpfsCfg, const char *relPath, char **finalPath)
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{
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struct stat buf;
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struct inode *inode = GetRelInodeFromVInode(zpfsCfg, relPath, &buf, finalPath);
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return inode;
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}
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static int VfsZpfsOpen(struct file *file, const char *relPath, int oflAgs, mode_t mode)
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{
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char *finalPath = NULL;
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struct inode *swapInode = NULL;
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int ret;
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struct inode *inode = file->f_inode;
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ZpfsConfig *zpfsCfg = GetZpfsConfig(inode);
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inode = VfsZpfsRealInode(zpfsCfg, relPath, &finalPath);
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if ((inode == NULL) || (!inode->u.i_mops->open)) {
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if (finalPath) {
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free(finalPath);
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}
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return -ENOENT;
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}
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swapInode = file->f_inode;
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file->f_inode = inode;
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ret = inode->u.i_mops->open(file, finalPath, oflAgs, mode);
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free(finalPath);
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finalPath = NULL;
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file->f_inode = swapInode;
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return ret;
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}
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static int VfsZpfsClose(struct file *file)
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{
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struct inode *swapInode = NULL;
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int ret;
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struct inode *inode = file->f_inode;
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ZpfsConfig *zpfsCfg = GetZpfsConfig(inode);
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inode = VfsZpfsRealInode(zpfsCfg, file->f_relpath, NULL);
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if ((inode == NULL) || (!inode->u.i_mops->close)) {
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return -ENOSYS;
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}
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swapInode = file->f_inode;
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file->f_inode = inode;
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ret = inode->u.i_mops->close(file);
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file->f_inode = swapInode;
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return ret;
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}
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static ssize_t VfsZpfsRead(struct file *file, char *buffer, size_t bufLen)
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{
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struct inode *swapInode = NULL;
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ssize_t sret;
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struct inode *inode = file->f_inode;
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ZpfsConfig *zpfsCfg = GetZpfsConfig(inode);
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inode = VfsZpfsRealInode(zpfsCfg, file->f_relpath, NULL);
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if ((inode == NULL) || (!inode->u.i_mops->read)) {
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return -ENOSYS;
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}
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swapInode = file->f_inode;
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file->f_inode = inode;
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sret = inode->u.i_mops->read(file, buffer, bufLen);
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file->f_inode = swapInode;
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return sret;
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}
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static off_t VfsZpfsLseek(struct file *file, off_t offset, int whence)
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{
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off_t off;
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struct inode *swapInode = NULL;
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struct inode *inode = file->f_inode;
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ZpfsConfig *zpfsCfg = GetZpfsConfig(inode);
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inode = VfsZpfsRealInode(zpfsCfg, file->f_relpath, NULL);
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if ((inode == NULL) || (!inode->u.i_mops->seek)) {
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return -ENOSYS;
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}
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swapInode = file->f_inode;
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file->f_inode = inode;
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off = inode->u.i_mops->seek(file, offset, whence);
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file->f_inode = swapInode;
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return off;
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}
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static loff_t VfsZpfsLseek64(struct file *file, loff_t offset, int whence)
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{
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loff_t off;
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struct inode *swapInode = NULL;
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struct inode *inode = file->f_inode;
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ZpfsConfig *zpfsCfg = GetZpfsConfig(inode);
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inode = VfsZpfsRealInode(zpfsCfg, file->f_relpath, NULL);
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if ((inode == NULL) || (!inode->u.i_mops->seek64)) {
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return -ENOSYS;
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}
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swapInode = file->f_inode;
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file->f_inode = inode;
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off = inode->u.i_mops->seek64(file, offset, whence);
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file->f_inode = swapInode;
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return off;
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}
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static int VfsZpfsDup(const struct file *oldFile, struct file *newFile)
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{
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int ret;
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struct inode *inode = oldFile->f_inode;
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ZpfsConfig *zpfsCfg = GetZpfsConfig(inode);
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inode = VfsZpfsRealInode(zpfsCfg, oldFile->f_relpath, NULL);
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if ((inode == NULL) || (!inode->u.i_mops->dup)) {
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return -ENOSYS;
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}
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ret = inode->u.i_mops->dup(oldFile, newFile);
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return ret;
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}
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static int VfsZpfsOpenDir(struct inode *mountpt, const char *relPath, struct fs_dirent_s *dir)
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{
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ZpfsConfig *zpfsCfg = GetZpfsConfig(mountpt);
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if (!VfsZpfsRealInode(zpfsCfg, relPath, NULL)) {
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return -ENOENT;
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}
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struct ZpfsDir *zpfsDir = malloc(sizeof(struct ZpfsDir));
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if (zpfsDir == NULL) {
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return -ENOMEM;
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}
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zpfsDir->relPath = strdup(relPath);
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if (zpfsDir->relPath == NULL) {
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return -ENOMEM;
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}
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zpfsDir->index = zpfsCfg->entryCount;
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zpfsDir->openEntry = -1;
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dir->u.zpfs = (void*)zpfsDir;
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return OK;
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}
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static void CloseEntry(const struct ZpfsConfig *zpfsCfg, struct fs_dirent_s *dir, const int index)
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{
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struct inode *inode = zpfsCfg->orgEntry[index].mountedInode;
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if (inode->u.i_mops->closedir != NULL) {
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inode->u.i_mops->closedir(inode, dir);
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}
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}
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static int VfsZpfsCloseDir(struct inode *mountpt, struct fs_dirent_s *dir)
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{
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struct ZpfsDir *zpfsDir = (struct ZpfsDir *)(dir->u.zpfs);
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if (zpfsDir->relPath) {
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free(zpfsDir->relPath);
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zpfsDir->relPath = NULL;
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}
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free(zpfsDir);
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zpfsDir = NULL;
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return OK;
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}
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static int IsExistInEntries(const struct ZpfsConfig *zpfsCfg, const char* relPath, const int index)
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{
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struct ZpfsEntry entry;
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struct stat buf;
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for (int i = index; i >= 0; i--) {
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entry.mountedPath = zpfsCfg->orgEntry[i].mountedRelpath;
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entry.mountedRelpath = (char *)relPath;
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entry.mountedInode = zpfsCfg->orgEntry[i].mountedInode;
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if (CheckEntryExist(&entry, NULL, &buf) == OK) {
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return OK;
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}
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}
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return -1;
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}
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static int OpenEntry(const struct ZpfsConfig *zpfsCfg,
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const struct ZpfsDir *zpfsDir, struct fs_dirent_s *dir, const int index)
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{
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int ret;
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char *fullPath;
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char *path = (char *)zpfsCfg->orgEntry[index].mountedRelpath;
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char *relPath = zpfsDir->relPath;
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struct inode *curInode = zpfsCfg->orgEntry[index].mountedInode;
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int len = strlen(path) + strlen(relPath) + 1;
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int fullLen = len + 1;
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fullPath = (char *)malloc(fullLen);
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if (fullPath == NULL) {
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return -ENOMEM;
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}
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ret = snprintf_s(fullPath, fullLen, len, "%s/%s", path, relPath);
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if (ret < 0) {
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free(fullPath);
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return -EINVAL;
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}
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ret = -ENOSYS;
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if (curInode->u.i_mops->opendir != NULL) {
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ret = curInode->u.i_mops->opendir(curInode, fullPath, dir);
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}
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free(fullPath);
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return ret;
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}
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static int VfsZpfsReadDir(struct inode *mountpt, struct fs_dirent_s *dir)
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{
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int ret;
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struct inode *oldInode = NULL;
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struct inode *curInode = NULL;
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struct ZpfsDir *zpfsDir = (struct ZpfsDir *)dir->u.zpfs;
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ZpfsConfig *zpfsCfg = GetZpfsConfig(mountpt);
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int index = zpfsDir->index;
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do {
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if (zpfsDir->openEntry == -1) {
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zpfsDir->index--;
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index = zpfsDir->index;
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if (index < 0) {
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ret = -1;
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break;
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}
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ret = OpenEntry(zpfsCfg, zpfsDir, dir, index);
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if (ret != OK) {
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break;
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}
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zpfsDir->openEntry = 1;
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}
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curInode = zpfsCfg->orgEntry[index].mountedInode;
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oldInode = dir->fd_root;
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dir->fd_root = curInode;
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ret = curInode->u.i_mops->readdir(curInode, dir);
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dir->fd_root = oldInode;
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if (ret != OK) {
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if (index >= 0) {
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CloseEntry(zpfsCfg, dir, index);
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zpfsDir->openEntry = -1;
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continue;
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}
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} else if (IsExistInEntries(zpfsCfg, dir->fd_dir[0].d_name, (index - 1)) == OK) {
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continue;
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}
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ret = 1; // 1 means current op return one file
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dir->fd_position++;
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dir->fd_dir[0].d_off = dir->fd_position;
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dir->fd_dir[0].d_reclen = (uint16_t)sizeof(struct dirent);
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break;
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} while (1);
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return ret;
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}
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static int VfsZpfsRewindDir(struct inode *mountpt, struct fs_dirent_s *dir)
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{
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PRINT_DEBUG("%s NOT support!\n", __FUNCTION__);
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return OK;
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}
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static int VfsZpfsBind(struct inode *blkDriver, const void *data, void **handle, const char *relPath)
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{
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if (data == NULL) {
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return -1;
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}
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(*handle) = (void*)data;
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return OK;
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}
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static int VfsZpfsUnbind(void *handle, struct inode **blkDriver)
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{
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struct inode *node = NULL;
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ZpfsConfig *zpfsCfg = NULL;
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if (handle != NULL) {
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zpfsCfg = (ZpfsConfig *)handle;
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node = inode_unlink(zpfsCfg->patchTarget);
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INODE_SET_TYPE(node, FSNODEFLAG_DELETED);
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if (node != zpfsCfg->patchInode) {
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return -EINVAL;
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}
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}
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return OK;
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}
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static int VfsZpfsStatFs(struct inode *mountpt, struct statfs *buf)
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{
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if (buf == NULL) {
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return -EINVAL;
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}
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(void)memset_s(buf, sizeof(struct statfs), 0, sizeof(struct statfs));
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buf->f_type = ZPFS_MAGIC;
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return OK;
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}
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static int VfsZpfsStat(struct inode *mountpt, const char *relPath, struct stat *buf)
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{
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struct inode *inode = NULL;
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ZpfsConfig *zpfsCfg = GetZpfsConfig(mountpt);
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inode = GetRelInodeFromVInode(zpfsCfg, relPath, buf, NULL);
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if (inode == NULL) {
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return -ENOENT;
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}
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return OK;
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}
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const struct mountpt_operations zpfsOperations = {
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VfsZpfsOpen, /* open */
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VfsZpfsClose, /* close */
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VfsZpfsRead, /* read */
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NULL, /* write */
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VfsZpfsLseek, /* seek */
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NULL, /* ioctl */
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OsVfsFileMmap, /* mmap */
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NULL, /* sync */
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VfsZpfsDup, /* dup */
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NULL, /* fstat */
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NULL, /* truncate */
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VfsZpfsOpenDir, /* opendir */
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VfsZpfsCloseDir, /* closedir */
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VfsZpfsReadDir, /* readdir */
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VfsZpfsRewindDir, /* rewinddir */
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VfsZpfsBind, /* bind */
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VfsZpfsUnbind, /* unbind */
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VfsZpfsStatFs, /* statfs */
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NULL, /* virstatfs */
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NULL, /* unlink */
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NULL, /* mkdir */
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NULL, /* rmdir */
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NULL, /* rename */
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VfsZpfsStat, /* stat */
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NULL, /* utime */
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NULL, /* chattr */
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VfsZpfsLseek64, /* seek64 */
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NULL, /* getlabel */
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NULL, /* fallocate */
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NULL, /* fallocate64 */
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NULL, /* truncate64 */
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NULL, /* fscheck */
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NULL, /* map_pages */
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NULL, /* readpage */
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NULL, /* writepage */
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};
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FSMAP_ENTRY(zpfs_fsmap, ZPFS_NAME, zpfsOperations, FALSE, FALSE);
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#endif // LOSCFG_FS_ZPFS
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