405 lines
10 KiB
C
405 lines
10 KiB
C
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/*
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* Copyright (c) 2022-2022 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_mount.h"
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#include "vfs_files.h"
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#include "vfs_maps.h"
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#include "vfs_config.h"
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#include "stdlib.h"
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#include "string.h"
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#include "limits.h"
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#include "errno.h"
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#include "securec.h"
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#include "vfs_operations.h"
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#include "los_compiler.h"
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#include "los_debug.h"
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#include "los_fs.h"
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#include "los_mux.h"
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struct MountPoint *g_mountPoints = NULL;
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static void MpDeleteFromList(struct MountPoint *mp)
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{
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struct MountPoint *prev = NULL;
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/* delete mp from mount list */
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if (g_mountPoints == mp) {
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g_mountPoints = mp->mNext;
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} else {
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for (prev = g_mountPoints; prev != NULL; prev = prev->mNext) {
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if (prev->mNext != mp) {
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continue;
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}
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prev->mNext = mp->mNext;
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break;
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}
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}
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}
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#if (LOSCFG_FS_SUPPORT_MOUNT_TARGET_RECURSIVE == 1)
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struct MountPoint *VfsMpFind(const char *path, const char **pathInMp)
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{
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struct MountPoint *mp = g_mountPoints;
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struct MountPoint *bestMp = NULL;
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int bestMatches = 0;
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if (pathInMp != NULL) {
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*pathInMp = NULL;
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}
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while ((mp != NULL) && (mp->mPath != NULL)) {
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const char *mPath = mp->mPath;
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const char *iPath = path;
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const char *t = NULL;
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int matches = 0;
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do {
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while ((*mPath == '/') && (*(mPath + 1) != '/')) {
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mPath++;
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}
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while ((*iPath == '/') && (*(iPath + 1) != '/')) {
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iPath++;
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}
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t = strchr(mPath, '/');
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if (t == NULL) {
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t = strchr(mPath, '\0');
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}
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if ((t == mPath) || (t == NULL)) {
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break;
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}
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if (strncmp(mPath, iPath, (size_t)(t - mPath)) != 0) {
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goto next; /* this mount point do not match, check next */
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}
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iPath += (t - mPath);
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if ((*iPath != '\0') && (*iPath != '/')) {
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goto next;
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}
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matches += (t - mPath);
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mPath += (t - mPath);
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} while (*mPath != '\0');
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if (matches > bestMatches) {
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bestMatches = matches;
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bestMp = mp;
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while ((*iPath == '/') && (*(iPath + 1) != '/')) {
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iPath++;
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}
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if (pathInMp != NULL) {
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*pathInMp = path;
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}
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}
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next:
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mp = mp->mNext;
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}
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return bestMp;
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}
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#else
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struct MountPoint *VfsMpFind(const char *path, const char **pathInMp)
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{
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struct MountPoint *mp = g_mountPoints;
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const char *iPath = path;
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const char *mPath = NULL;
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const char *target = NULL;
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if (pathInMp != NULL) {
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*pathInMp = NULL;
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}
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while (*iPath == '/') {
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++iPath;
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}
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while ((mp != NULL) && (mp->mPath != NULL)) {
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mPath = mp->mPath;
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target = iPath;
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while (*mPath == '/') {
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++mPath;
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}
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while ((*mPath != '\0') && (*mPath != '/') &&
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(*target != '\0') && (*target != '/')) {
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if (*mPath != *target) {
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break;
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}
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++mPath;
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++target;
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}
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if (((*mPath == '\0') || (*mPath == '/')) &&
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((*target == '\0') || (*target == '/'))) {
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if (pathInMp != NULL) {
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*pathInMp = path;
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}
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return mp;
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}
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mp = mp->mNext;
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}
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return NULL;
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}
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#endif
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STATIC struct MountPoint *VfsMountPointInit(const char *source, const char *target,
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const char *fsType, unsigned long mountflags)
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{
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struct MountPoint *mp = NULL;
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const char *pathInMp = NULL;
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struct FsMap *mFs = NULL;
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size_t ssize = 0;
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size_t tsize;
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/* find mp by target, to see if it was mounted */
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mp = VfsMpFind(target, &pathInMp);
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if (mp != NULL && pathInMp != NULL) {
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errno = EINVAL;
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return NULL;
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}
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/* Find fsMap corresponding to the fsType */
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mFs = VfsFsMapGet(fsType);
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if ((mFs == NULL) || (mFs->fsMops == NULL) || (mFs->fsMops->mount == NULL)) {
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errno = ENODEV;
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return NULL;
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}
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if (source != NULL) {
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ssize = strlen(source) + 1;
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}
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tsize = strlen(target) + 1;
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mp = (struct MountPoint *)LOSCFG_FS_MALLOC_HOOK(sizeof(struct MountPoint) + ssize + tsize);
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if (mp == NULL) {
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errno = ENOMEM;
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return NULL;
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}
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mp->mFs = mFs;
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mp->mDev = NULL;
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mp->mRefs = 0;
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mp->mWriteEnable = (mountflags & MS_RDONLY) ? FALSE : TRUE;
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mp->mFs->fsRefs++;
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if (source != NULL && strcpy_s((char *)mp + sizeof(struct MountPoint), ssize, source) != EOK) {
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LOSCFG_FS_FREE_HOOK(mp);
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errno = ENOMEM;
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return NULL;
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}
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if (strcpy_s((char *)mp + sizeof(struct MountPoint) + ssize, tsize, target) != EOK) {
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LOSCFG_FS_FREE_HOOK(mp);
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errno = ENOMEM;
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return NULL;
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}
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mp->mDev = source ? (char *)mp + sizeof(struct MountPoint) : NULL;
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mp->mPath = (char *)mp + sizeof(struct MountPoint) + ssize;
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return mp;
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}
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STATIC int VfsRemount(const char *source, const char *target,
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const char *fsType, unsigned long mountflags,
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const void *data)
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{
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(VOID)source;
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(VOID)fsType;
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struct MountPoint *mp;
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mp = VfsMpFind(target, NULL);
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if (mp == NULL) {
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errno = EINVAL;
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return (int)LOS_NOK;
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}
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LOS_ASSERT(mp->mFs != NULL);
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LOS_ASSERT(mp->mFs->fsMops != NULL);
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LOS_ASSERT(mp->mFs->fsMops->mount != NULL);
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return mp->mFs->fsMops->mount(mp, mountflags, data);
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}
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STATIC int VfsMountPathCheck(const char *target)
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{
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/* target must begin with '/', for example /system, /data, etc. */
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if ((target == NULL) || (target[0] != '/')) {
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errno = EINVAL;
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return (int)LOS_NOK;
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}
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if (strlen(target) >= PATH_MAX) {
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errno = ENAMETOOLONG;
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return (int)LOS_NOK;
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}
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return LOS_OK;
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}
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int mount(const char *source, const char *target,
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const char *fsType, unsigned long mountflags,
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const void *data)
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{
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int ret;
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struct MountPoint *mp = NULL;
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if (VfsMountPathCheck(target) != LOS_OK) {
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return (int)LOS_NOK;
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}
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(void)LOS_FsLock();
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if (mountflags & MS_REMOUNT) {
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ret = VfsRemount(source, target, fsType, mountflags, data);
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LOS_FsUnlock();
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return ret;
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}
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mp = VfsMountPointInit(source, target, fsType, mountflags);
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if (mp == NULL) {
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LOS_FsUnlock();
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return (int)LOS_NOK;
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}
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ret = mp->mFs->fsMops->mount(mp, mountflags, data);
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if (ret != 0) {
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/* errno is set */
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PRINT_ERR("mount failed, target %s.\n", target);
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goto errout;
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}
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mp->mNext = g_mountPoints;
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g_mountPoints = mp;
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LOS_FsUnlock();
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return LOS_OK;
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errout:
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LOSCFG_FS_FREE_HOOK(mp);
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LOS_FsUnlock();
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return (int)LOS_NOK;
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}
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int umount(const char *target)
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{
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struct MountPoint *mp = NULL;
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int ret = (int)LOS_NOK;
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(void)LOS_FsLock();
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if (VfsMountPathCheck(target) != LOS_OK) {
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goto errout;
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}
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mp = VfsMpFind(target, NULL);
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if ((mp == NULL) || (mp->mRefs != 0)) {
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goto errout;
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}
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if ((mp->mFs == NULL) || (mp->mFs->fsMops == NULL) ||
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(mp->mFs->fsMops->umount == NULL)) {
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goto errout;
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}
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ret = mp->mFs->fsMops->umount(mp);
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if (ret != 0) {
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/* errno is set */
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goto errout;
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}
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/* delete mp from mount list */
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MpDeleteFromList(mp);
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mp->mFs->fsRefs--;
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LOSCFG_FS_FREE_HOOK(mp);
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LOS_FsUnlock();
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return LOS_OK;
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errout:
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PRINT_ERR("umount2 failed, target %s.\n", target);
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LOS_FsUnlock();
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return (int)LOS_NOK;
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}
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static void CloseFdsInMp(const struct MountPoint *mp)
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{
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for (int fd = 0; fd < NR_OPEN_DEFAULT; fd++) {
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struct File *f = FdToFile(fd);
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if (f == NULL) {
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continue;
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}
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if ((f->fMp == mp) &&
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(f->fFops != NULL) &&
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(f->fFops->close != NULL)) {
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(void)f->fFops->close(f);
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}
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}
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}
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int umount2(const char *target, int flag)
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{
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struct MountPoint *mp = NULL;
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int ret = (int)LOS_NOK;
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(void)LOS_FsLock();
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if (VfsMountPathCheck(target) != LOS_OK) {
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goto errout;
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}
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mp = VfsMpFind(target, NULL);
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if ((mp == NULL) || (mp->mRefs != 0) ||
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(mp->mFs == NULL) || (mp->mFs->fsMops == NULL) ||
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(mp->mFs->fsMops->umount2 == NULL)) {
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goto errout;
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}
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/* Close all files under the mount point */
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if ((UINT32)flag & MNT_FORCE) {
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CloseFdsInMp(mp);
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}
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ret = mp->mFs->fsMops->umount2(mp, flag);
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if (ret != 0) {
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/* errno is set */
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goto errout;
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}
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/* delete mp from mount list */
|
||
|
|
MpDeleteFromList(mp);
|
||
|
|
mp->mFs->fsRefs--;
|
||
|
|
LOSCFG_FS_FREE_HOOK(mp);
|
||
|
|
|
||
|
|
LOS_FsUnlock();
|
||
|
|
return LOS_OK;
|
||
|
|
|
||
|
|
errout:
|
||
|
|
PRINT_ERR("umount2 failed, target %s.\n", target);
|
||
|
|
LOS_FsUnlock();
|
||
|
|
return (int)LOS_NOK;
|
||
|
|
}
|