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kernel_liteos_a/fs/zpfs/zpfs.c

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/*
* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "vfs_zpfs.h"
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/statfs.h>
#include "fs/dirent_fs.h"
#include "inode/inode.h"
#include "internal.h"
#include "los_tables.h"
#ifdef LOSCFG_FS_ZPFS
/****************************************************************************
* Name: CheckEntryExist
*
* Description:
* check if entry is exist or not.
* Input Parameters:
* The path
* Returned Value:
* true or false, it is true for the exist of path.
****************************************************************************/
bool CheckEntryExist(const char *entry)
{
struct stat64 stat64Info;
struct stat statInfo;
if (stat64(entry, &stat64Info) == 0) {
if (S_ISDIR(stat64Info.st_mode) != 0) {
return true;
} else {
return false;
}
} else if (stat(entry, &statInfo) == 0) {
if (S_ISDIR(statInfo.st_mode) != 0) {
return true;
} else {
return false;
}
}
return false;
}
/****************************************************************************
* Name: GetZpfsConfig
*
* Description:
* get the zpfs configuration
* Input Parameters:
* void
* Returned Value:
* g_zpfsConfig Save the patch gobal data.
****************************************************************************/
ZpfsConfig *GetZpfsConfig(const struct inode *inode)
{
ZpfsConfig *zpfsCfg = (ZpfsConfig*)(inode->i_private);
return zpfsCfg;
}
/****************************************************************************
* Name: GetSourceList
*
* Description:
* Get the source path list.
* eg: /patch/etc:/patch/etc1:/patch/etc2
* Input Parameters:
* source: /patch/etc:/patch/etc1:/patch/etc2
* sourcelist: output path arry
* num: output list num
*
* Returned Value:
* OK The mounted folder parameter is right.
* EINVAL The mounted folder parameter is wrong.
* ENOMEM The memory is not enough
****************************************************************************/
static int GetSourceList(const char *source, char *sourceList[ZPFS_LEVELS], int *num)
{
char *subSource = NULL;
char *path = NULL;
char *subPath = NULL;
int index;
int ret;
subSource = strdup(source);
if (subSource == NULL) {
return -ENOMEM;
}
subPath = strtok_r(subSource, ":", &path);
for (*num = 0; *num < ZPFS_LEVELS && subPath != NULL; (*num)++) {
sourceList[*num] = strdup(subPath);
if (sourceList[*num] == NULL) {
ret = -ENOMEM;
goto EXIT;
}
subPath = strtok_r(NULL, ":", &path);
}
if (subPath != NULL || *num == 0) {
PRINTK("source path num %d error\n", *num);
ret = -EINVAL;
goto EXIT;
}
free(subSource);
return OK;
EXIT:
free(subSource);
for (index = 0; index < *num; index++) {
free(sourceList[index]);
sourceList[index] = NULL;
}
*num = 0;
return ret;
}
/****************************************************************************
* Name: CheckInputParamsFormat
*
* Description:
* check the mounted folder format and validity. MAX three segment.
* eg: /patch/etc:/patch/etc1:/patch/etc2
* Input Parameters:
* check the mounted folder. eg:
* source: /patch/etc:/patch/etc1:/patch/etc2
* target: /etc
*
* Returned Value:
* OK The mounted folder parameter is right.
* EINVAL The mounted folder parameter is wrong.
* ENOMEM The memory is not enough
****************************************************************************/
static int CheckInputParamsFormat(const char *source, const char *target)
{
char *sourceList[ZPFS_LEVELS] = {0};
int num = 0;
int ret;
int index;
bool isTargetValid = false;
if (source == NULL || target == NULL) {
return -EINVAL;
}
ret = GetSourceList(source, sourceList, &num);
if (ret != OK) {
goto EXIT;
}
for (index = 0; index < num; index++) {
if (!CheckEntryExist(sourceList[index])) {
ret = -ENOENT;
goto EXIT;
}
/* target must same with one source path */
if (strcmp(target, sourceList[index]) == 0) {
isTargetValid = true;
}
}
if (!isTargetValid) {
ret = -EINVAL;
goto EXIT;
}
ret = OK;
EXIT:
for (index = 0; index < num; index++) {
free(sourceList[index]);
}
return ret;
}
static void ZpfsFreeEntry(ZpfsEntry *zpfsEntry)
{
if (zpfsEntry->mountedPath != NULL) {
free(zpfsEntry->mountedPath);
zpfsEntry->mountedPath = NULL;
}
if (zpfsEntry->mountedRelpath != NULL) {
free(zpfsEntry->mountedRelpath);
zpfsEntry->mountedRelpath = NULL;
}
zpfsEntry->mountedInode = NULL;
}
/****************************************************************************
* Name: ZpfsFreeConfig
*
* Description:
* Umount the patch file system,
* Delete the global patch data and the mount pseudo point.
*
* Input Parameters:
* void
* Returned Value:
* void
****************************************************************************/
void ZpfsFreeConfig(ZpfsConfig *zpfsCfg)
{
struct inode *pInode = NULL;
if (zpfsCfg == NULL) {
return;
}
pInode = zpfsCfg->patchInode;
if (pInode != NULL) {
INODE_SET_TYPE(pInode, FSNODEFLAG_DELETED);
inode_release(pInode);
pInode = NULL;
}
for (int i = 0; i < zpfsCfg->entryCount; i++) {
ZpfsFreeEntry(&(zpfsCfg->orgEntry[i]));
}
if (zpfsCfg->patchTarget != NULL) {
free(zpfsCfg->patchTarget);
zpfsCfg->patchTarget = NULL;
}
free(zpfsCfg);
zpfsCfg = NULL;
}
/****************************************************************************
* Name: IsTargetMounted
* Description:
* The mount patch target path must be the mounted path.
* Input Parameters:
* target: The mount point
* Returned Value:
* OK
* EINVAL The mount patch target path is not the mounted path.
****************************************************************************/
static int IsTargetMounted(const char *target)
{
struct inode *inode = NULL;
char *path = NULL;
struct statfs buf;
if (!CheckEntryExist(target)) {
return -EINVAL;
}
inode = inode_search((const char **)&target, (struct inode**)NULL,
(struct inode**)NULL, (const char **)&path);
if (inode == NULL || !INODE_IS_MOUNTPT(inode)) {
PRINT_ERR("Can't to mount to this inode %s\n", target);
return -EINVAL;
}
if ((inode->u.i_mops != NULL) && (inode->u.i_mops->statfs != NULL)) {
if (inode->u.i_mops->statfs(inode, &buf) == OK) {
if (buf.f_type == ZPFS_MAGIC) {
return -EEXIST;
}
}
}
if (path == NULL || path[0] == '\0') {
return -EEXIST;
}
return OK;
}
/****************************************************************************
* Name: SaveZpfsParameter
*
* Description:
* When the patch file system is mounted, the patch gobal data is built.
*
* Input Parameters:
* source: The mounted patch folder
* target: The mount point
* Returned Value:
* OK Save the patch gobal data.
* ENOMEM The memory is not enough.
* EBADMSG There is no data.
****************************************************************************/
static int SaveZpfsParameter(const char *source, const char *target, struct ZpfsConfig *zpfsCfg)
{
int ret;
const char *path = NULL;
int num = 0;
int index;
char *sourceList[ZPFS_LEVELS] = {0};
/* save the mount point */
zpfsCfg->patchTarget = strdup(target);
if (zpfsCfg->patchTarget == NULL) {
return -ENOMEM;
}
/* save the mount folder inode */
zpfsCfg->patchTargetInode = inode_search((const char **)&target,
(struct inode**)NULL, (struct inode**)NULL, &path);
if (zpfsCfg->patchTargetInode == NULL) {
return -EINVAL;
}
ret = GetSourceList(source, sourceList, &num);
if (ret != OK) {
return ret;
}
zpfsCfg->entryCount = num;
for (index = 0; index < num; index++) {
zpfsCfg->orgEntry[index].mountedPath = sourceList[index];
/* save the mounted folder inode */
zpfsCfg->orgEntry[index].mountedInode = inode_search((const char **)&sourceList[index],
(struct inode**)NULL, (struct inode**)NULL, &path);
if (zpfsCfg->orgEntry[index].mountedInode == NULL) {
ret = -EINVAL;
goto ERROR_PROCESS;
}
/* save the mounted relative path */
zpfsCfg->orgEntry[index].mountedRelpath = (char*)path;
}
return OK;
ERROR_PROCESS:
for (index = 0; index < num; index++) {
free(sourceList[index]);
sourceList[index] = NULL;
}
return ret;
}
/****************************************************************************
* Name: ZpfsPrepare
* Description:
* The main function of mount zpfs.
* Input Parameters:
* source: The mounted parameter
* target: The mount path
* inodePtr: the new inode info of target
* force: It is true for zpfs
* Returned Value:
* OK
* EINVAL The parameter is wrong.
* ENOMEM It is not enough memory.
****************************************************************************/
int ZpfsPrepare(const char *source, const char *target, struct inode **inodePtr, bool force)
{
/* Check the mounted folder parameter */
int ret = CheckInputParamsFormat(source, target);
if (ret != OK) {
PRINT_ERR("Parameter is err source:%s target:%s.\n", source, target);
return ret;
}
/* The mount target path must be the mounted path */
ret = IsTargetMounted(target);
if (ret != OK) {
PRINT_ERR("Can't to mount to this inode %s\n", target);
return ret;
}
ZpfsConfig *zpfsCfg = (ZpfsConfig*) malloc(sizeof(struct ZpfsConfig));
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
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