465 lines
13 KiB
C
465 lines
13 KiB
C
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/*
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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 <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/statfs.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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#ifdef LOSCFG_FS_ZPFS
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/****************************************************************************
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* Name: CheckEntryExist
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*
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* Description:
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* check if entry is exist or not.
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* Input Parameters:
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* The path
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* Returned Value:
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* true or false, it is true for the exist of path.
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****************************************************************************/
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bool CheckEntryExist(const char *entry)
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{
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struct stat64 stat64Info;
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struct stat statInfo;
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if (stat64(entry, &stat64Info) == 0) {
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if (S_ISDIR(stat64Info.st_mode) != 0) {
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return true;
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} else {
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return false;
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}
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} else if (stat(entry, &statInfo) == 0) {
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if (S_ISDIR(statInfo.st_mode) != 0) {
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return true;
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} else {
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return false;
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}
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}
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return false;
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}
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/****************************************************************************
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* Name: GetZpfsConfig
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*
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* Description:
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* get the zpfs configuration
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* Input Parameters:
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* void
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* Returned Value:
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* g_zpfsConfig Save the patch gobal data.
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****************************************************************************/
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ZpfsConfig *GetZpfsConfig(const struct inode *inode)
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{
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ZpfsConfig *zpfsCfg = (ZpfsConfig*)(inode->i_private);
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return zpfsCfg;
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}
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/****************************************************************************
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* Name: GetSourceList
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*
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* Description:
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* Get the source path list.
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* eg: /patch/etc:/patch/etc1:/patch/etc2
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* Input Parameters:
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* source: /patch/etc:/patch/etc1:/patch/etc2
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* sourcelist: output path arry
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* num: output list num
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*
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* Returned Value:
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* OK The mounted folder parameter is right.
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* EINVAL The mounted folder parameter is wrong.
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* ENOMEM The memory is not enough
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****************************************************************************/
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static int GetSourceList(const char *source, char *sourceList[ZPFS_LEVELS], int *num)
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{
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char *subSource = NULL;
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char *path = NULL;
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char *subPath = NULL;
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int index;
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int ret;
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subSource = strdup(source);
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if (subSource == NULL) {
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return -ENOMEM;
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}
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subPath = strtok_r(subSource, ":", &path);
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for (*num = 0; *num < ZPFS_LEVELS && subPath != NULL; (*num)++) {
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sourceList[*num] = strdup(subPath);
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if (sourceList[*num] == NULL) {
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ret = -ENOMEM;
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goto EXIT;
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}
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subPath = strtok_r(NULL, ":", &path);
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}
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if (subPath != NULL || *num == 0) {
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PRINTK("source path num %d error\n", *num);
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ret = -EINVAL;
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goto EXIT;
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}
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free(subSource);
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return OK;
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EXIT:
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free(subSource);
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for (index = 0; index < *num; index++) {
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free(sourceList[index]);
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sourceList[index] = NULL;
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}
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*num = 0;
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return ret;
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}
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/****************************************************************************
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* Name: CheckInputParamsFormat
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*
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* Description:
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* check the mounted folder format and validity. MAX three segment.
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* eg: /patch/etc:/patch/etc1:/patch/etc2
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* Input Parameters:
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* check the mounted folder. eg:
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* source: /patch/etc:/patch/etc1:/patch/etc2
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* target: /etc
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*
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* Returned Value:
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* OK The mounted folder parameter is right.
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* EINVAL The mounted folder parameter is wrong.
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* ENOMEM The memory is not enough
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****************************************************************************/
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static int CheckInputParamsFormat(const char *source, const char *target)
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{
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char *sourceList[ZPFS_LEVELS] = {0};
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int num = 0;
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int ret;
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int index;
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bool isTargetValid = false;
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if (source == NULL || target == NULL) {
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return -EINVAL;
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}
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ret = GetSourceList(source, sourceList, &num);
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if (ret != OK) {
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goto EXIT;
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}
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for (index = 0; index < num; index++) {
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if (!CheckEntryExist(sourceList[index])) {
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ret = -ENOENT;
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goto EXIT;
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}
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/* target must same with one source path */
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if (strcmp(target, sourceList[index]) == 0) {
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isTargetValid = true;
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}
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}
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if (!isTargetValid) {
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ret = -EINVAL;
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goto EXIT;
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}
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ret = OK;
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EXIT:
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for (index = 0; index < num; index++) {
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free(sourceList[index]);
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}
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return ret;
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}
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static void ZpfsFreeEntry(ZpfsEntry *zpfsEntry)
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{
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if (zpfsEntry->mountedPath != NULL) {
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free(zpfsEntry->mountedPath);
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zpfsEntry->mountedPath = NULL;
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}
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if (zpfsEntry->mountedRelpath != NULL) {
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free(zpfsEntry->mountedRelpath);
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zpfsEntry->mountedRelpath = NULL;
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}
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zpfsEntry->mountedInode = NULL;
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}
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/****************************************************************************
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* Name: ZpfsFreeConfig
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*
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* Description:
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* Umount the patch file system,
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* Delete the global patch data and the mount pseudo point.
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*
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* Input Parameters:
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* void
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* Returned Value:
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* void
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****************************************************************************/
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void ZpfsFreeConfig(ZpfsConfig *zpfsCfg)
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{
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struct inode *pInode = NULL;
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if (zpfsCfg == NULL) {
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return;
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}
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pInode = zpfsCfg->patchInode;
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if (pInode != NULL) {
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INODE_SET_TYPE(pInode, FSNODEFLAG_DELETED);
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inode_release(pInode);
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pInode = NULL;
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}
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for (int i = 0; i < zpfsCfg->entryCount; i++) {
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ZpfsFreeEntry(&(zpfsCfg->orgEntry[i]));
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}
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if (zpfsCfg->patchTarget != NULL) {
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free(zpfsCfg->patchTarget);
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zpfsCfg->patchTarget = NULL;
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}
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free(zpfsCfg);
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zpfsCfg = NULL;
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}
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/****************************************************************************
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* Name: IsTargetMounted
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* Description:
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* The mount patch target path must be the mounted path.
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* Input Parameters:
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* target: The mount point
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* Returned Value:
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* OK
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* EINVAL The mount patch target path is not the mounted path.
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****************************************************************************/
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static int IsTargetMounted(const char *target)
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{
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struct inode *inode = NULL;
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char *path = NULL;
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struct statfs buf;
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if (!CheckEntryExist(target)) {
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return -EINVAL;
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}
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inode = inode_search((FAR const char **)&target, (FAR struct inode**)NULL,
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(FAR struct inode**)NULL, (const char **)&path);
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if (inode == NULL || !INODE_IS_MOUNTPT(inode)) {
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PRINT_ERR("Can't to mount to this inode %s\n", target);
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return -EINVAL;
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}
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if ((inode->u.i_mops != NULL) && (inode->u.i_mops->statfs != NULL)) {
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if (inode->u.i_mops->statfs(inode, &buf) == OK) {
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if (buf.f_type == ZPFS_MAGIC) {
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return -EEXIST;
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}
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}
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}
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if (path == NULL || path[0] == '\0') {
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return -EEXIST;
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}
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return OK;
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}
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/****************************************************************************
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* Name: SaveZpfsParameter
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*
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* Description:
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* When the patch file system is mounted, the patch gobal data is built.
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*
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* Input Parameters:
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* source: The mounted patch folder
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* target: The mount point
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* Returned Value:
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* OK Save the patch gobal data.
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* ENOMEM The memory is not enough.
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* EBADMSG There is no data.
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****************************************************************************/
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static int SaveZpfsParameter(const char *source, const char *target, struct ZpfsConfig *zpfsCfg)
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{
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int ret;
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const char *path = NULL;
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int num = 0;
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int index;
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char *sourceList[ZPFS_LEVELS] = {0};
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/* save the mount point */
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zpfsCfg->patchTarget = strdup(target);
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if (zpfsCfg->patchTarget == NULL) {
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return -ENOMEM;
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}
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/* save the mount folder inode */
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zpfsCfg->patchTargetInode = inode_search((const char **)&target,
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(struct inode**)NULL, (struct inode**)NULL, &path);
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if (zpfsCfg->patchTargetInode == NULL) {
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return -EINVAL;
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}
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ret = GetSourceList(source, sourceList, &num);
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if (ret != OK) {
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return ret;
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}
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zpfsCfg->entryCount = num;
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for (index = 0; index < num; index++) {
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zpfsCfg->orgEntry[index].mountedPath = sourceList[index];
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/* save the mounted folder inode */
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zpfsCfg->orgEntry[index].mountedInode = inode_search((const char **)&sourceList[index],
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(struct inode**)NULL, (struct inode**)NULL, &path);
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if (zpfsCfg->orgEntry[index].mountedInode == NULL) {
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ret = -EINVAL;
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goto ERROR_PROCESS;
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}
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/* save the mounted relative path */
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zpfsCfg->orgEntry[index].mountedRelpath = (char*)path;
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}
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return OK;
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ERROR_PROCESS:
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for (index = 0; index < num; index++) {
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free(sourceList[index]);
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sourceList[index] = NULL;
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}
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return ret;
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}
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/****************************************************************************
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* Name: ZpfsPrepare
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* Description:
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* The main function of mount zpfs.
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* Input Parameters:
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* source: The mounted parameter
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* target: The mount path
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* inodePtr: the new inode info of target
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* force: It is true for zpfs
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* Returned Value:
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* OK
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* EINVAL The parameter is wrong.
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* ENOMEM It is not enough memory.
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****************************************************************************/
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int ZpfsPrepare(const char *source, const char *target, struct inode **inodePtr, bool force)
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{
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/* Check the mounted folder parameter */
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int ret = CheckInputParamsFormat(source, target);
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if (ret != OK) {
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PRINT_ERR("Parameter is err source:%s target:%s.\n", source, target);
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return ret;
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}
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/* The mount target path must be the mounted path */
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ret = IsTargetMounted(target);
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if (ret != OK) {
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PRINT_ERR("Can't to mount to this inode %s\n", target);
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return ret;
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}
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ZpfsConfig *zpfsCfg = (ZpfsConfig*) malloc(sizeof(struct ZpfsConfig));
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if (zpfsCfg == NULL) {
|
||
|
|
PRINT_ERR("Memory is not enought.\n");
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
(void)memset_s(zpfsCfg, sizeof(struct ZpfsConfig), 0, sizeof(struct ZpfsConfig));
|
||
|
|
|
||
|
|
/* Save the patch global data */
|
||
|
|
ret = SaveZpfsParameter(source, target, zpfsCfg);
|
||
|
|
if (ret != OK) {
|
||
|
|
ZpfsFreeConfig(zpfsCfg);
|
||
|
|
PRINT_ERR("Memory is not enought.\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Create the patch inode */
|
||
|
|
ret = inode_reserve_rootdir(target, inodePtr, force);
|
||
|
|
if (ret != OK) {
|
||
|
|
ZpfsFreeConfig(zpfsCfg);
|
||
|
|
PRINT_ERR("failed to create mounted inode.\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
zpfsCfg->patchInode = *inodePtr;
|
||
|
|
(*inodePtr)->i_private = zpfsCfg;
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* Name: ZpfsCleanUp
|
||
|
|
* Description:
|
||
|
|
* Clean the configuration of zpfs.
|
||
|
|
* Input Parameters:
|
||
|
|
* target: The mount path
|
||
|
|
* Returned Value:
|
||
|
|
* void
|
||
|
|
****************************************************************************/
|
||
|
|
void ZpfsCleanUp(const void *node, const char *target)
|
||
|
|
{
|
||
|
|
struct statfs buf;
|
||
|
|
struct inode *inode = (struct inode *)node;
|
||
|
|
if ((target == NULL) || (inode == NULL) ||
|
||
|
|
(inode->u.i_mops == NULL) ||
|
||
|
|
(inode->u.i_mops->statfs == NULL)) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
if (inode->u.i_mops->statfs(inode, &buf) == OK) {
|
||
|
|
if (buf.f_type == ZPFS_MAGIC) {
|
||
|
|
ZpfsConfig *zpfsCfg = inode->i_private;
|
||
|
|
if (strcmp(zpfsCfg->patchTarget, target) == 0) {
|
||
|
|
ZpfsFreeConfig(zpfsCfg);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
bool IsZpfsFileSystem(struct inode *inode)
|
||
|
|
{
|
||
|
|
struct statfs buf;
|
||
|
|
if (inode == NULL || inode->u.i_mops == NULL ||
|
||
|
|
inode->u.i_mops->statfs == NULL) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
if (inode->u.i_mops->statfs(inode, &buf) == OK) {
|
||
|
|
if (buf.f_type == ZPFS_MAGIC) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif // LOSCFG_FS_ZPFS
|