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kernel_liteos_a/fs/vfs/operation/vfs_file_mapping.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 "fs/file.h"
#include "fs/file.h"
#include "fs/fs_operation.h"
#include "unistd.h"
#include "los_mux.h"
#include "los_list.h"
#include "los_atomic.h"
#include "los_vm_filemap.h"
#ifdef LOSCFG_KERNEL_VM
static struct file_map g_file_mapping = {0};
uint init_file_mapping()
{
uint ret;
LOS_ListInit(&g_file_mapping.head);
ret = LOS_MuxInit(&g_file_mapping.lock, NULL);
if (ret != LOS_OK) {
PRINT_ERR("Create mutex for file map of page cache failed, (ret=%u)\n", ret);
}
return ret;
}
static void clear_file_mapping(const struct page_mapping *mapping)
{
unsigned int i = 3; /* file start fd */
struct file *filp = NULL;
while (i < CONFIG_NFILE_DESCRIPTORS) {
filp = &tg_filelist.fl_files[i];
if (filp->f_mapping == mapping) {
filp->f_mapping = NULL;
}
i++;
}
}
static struct page_mapping *find_mapping_nolock(const char *fullpath)
{
char *map_name = NULL;
struct file_map *fmap = NULL;
int name_len = strlen(fullpath);
LOS_DL_LIST_FOR_EACH_ENTRY(fmap, &g_file_mapping.head, struct file_map, head) {
map_name = fmap->rename ? fmap->rename: fmap->owner;
if ((name_len == fmap->name_len) && !strcmp(map_name, fullpath)) {
return &fmap->mapping;
}
}
return NULL;
}
void add_mapping(struct file *filep, const char *fullpath)
{
int path_len;
status_t retval;
struct file_map *fmap = NULL;
struct page_mapping *mapping = NULL;
if (filep == NULL || fullpath == NULL) {
return;
}
(VOID)LOS_MuxLock(&g_file_mapping.lock, LOS_WAIT_FOREVER);
mapping = find_mapping_nolock(fullpath);
if (mapping) {
LOS_AtomicInc(&mapping->ref);
filep->f_mapping = mapping;
mapping->host = filep;
goto out;
}
path_len = strlen(fullpath);
fmap = (struct file_map *)zalloc(sizeof(struct file_map) + path_len + 1);
if (!fmap) {
PRINT_WARN("%s %d, Mem alloc failed.\n", __FUNCTION__, __LINE__);
goto out;
}
LOS_AtomicSet(&fmap->mapping.ref, 1);
fmap->name_len = path_len;
(void)strcpy_s(fmap->owner, path_len + 1, fullpath);
LOS_ListInit(&fmap->mapping.page_list);
LOS_SpinInit(&fmap->mapping.list_lock);
retval = LOS_MuxInit(&fmap->mapping.mux_lock, NULL);
if (retval != LOS_OK) {
PRINT_ERR("%s %d, Create mutex for mapping.mux_lock failed, status: %d\n", __FUNCTION__, __LINE__, retval);
goto out;
}
LOS_ListTailInsert(&g_file_mapping.head, &fmap->head);
filep->f_mapping = &fmap->mapping;
filep->f_mapping->host = filep;
out:
(VOID)LOS_MuxUnlock(&g_file_mapping.lock);
}
int remove_mapping_nolock(struct page_mapping *mapping)
{
struct file_map *fmap = NULL;
if (mapping == NULL) {
set_errno(EINVAL);
return EINVAL;
}
(VOID)LOS_MuxDestroy(&mapping->mux_lock);
clear_file_mapping(mapping);
OsFileCacheRemove(mapping);
fmap = LOS_DL_LIST_ENTRY(mapping, struct file_map, mapping);
LOS_ListDelete(&fmap->head);
if (fmap->rename) {
LOS_MemFree(m_aucSysMem0, fmap->rename);
}
LOS_MemFree(m_aucSysMem0, fmap);
return OK;
}
void dec_mapping_nolock(struct page_mapping *mapping)
{
if (mapping == NULL) {
return;
}
(VOID)LOS_MuxLock(&g_file_mapping.lock, LOS_WAIT_FOREVER);
if (LOS_AtomicRead(&mapping->ref) > 0) {
LOS_AtomicDec(&mapping->ref);
}
if (LOS_AtomicRead(&mapping->ref) <= 0) {
remove_mapping_nolock(mapping);
} else {
OsFileCacheFlush(mapping);
}
(VOID)LOS_MuxUnlock(&g_file_mapping.lock);
}
int remove_mapping(const char *fullpath)
{
int ret;
struct filelist *f_list = NULL;
struct page_mapping *mapping = NULL;
f_list = &tg_filelist;
ret = sem_wait(&f_list->fl_sem);
if (ret < 0) {
PRINTK("sem_wait error, ret=%d\n", ret);
return VFS_ERROR;
}
(VOID)LOS_MuxLock(&g_file_mapping.lock, LOS_WAIT_FOREVER);
mapping = find_mapping_nolock(fullpath);
if (mapping) {
ret = remove_mapping_nolock(mapping);
}
(VOID)LOS_MuxUnlock(&g_file_mapping.lock);
(void)sem_post(&f_list->fl_sem);
return OK;
}
void rename_mapping(const char *src_path, const char *dst_path)
{
int ret;
char *tmp = NULL;
int path_len;
struct file_map *fmap = NULL;
struct page_mapping *mapping = NULL;
if (src_path == NULL || dst_path == NULL) {
return;
}
path_len = strlen(dst_path);
/* protect the whole list in case of this node been deleted just after we found it */
(VOID)LOS_MuxLock(&g_file_mapping.lock, LOS_WAIT_FOREVER);
mapping = find_mapping_nolock(src_path);
if (!mapping) {
goto out;
}
fmap = LOS_DL_LIST_ENTRY(mapping, struct file_map, mapping);
tmp = LOS_MemAlloc(m_aucSysMem0, path_len + 1);
if (!tmp) {
PRINT_ERR("%s-%d: Mem alloc failed, path length(%d)\n", __FUNCTION__, __LINE__, path_len);
goto out;
}
ret = strncpy_s(tmp, path_len, dst_path, strlen(dst_path));
if (ret != 0) {
(VOID)LOS_MemFree(m_aucSysMem0, tmp);
goto out;
}
tmp[path_len] = '\0';
fmap->rename = tmp;
out:
(VOID)LOS_MuxUnlock(&g_file_mapping.lock);
}
int update_file_path(const char *old_path, const char *new_path)
{
struct filelist *f_list = NULL;
struct file *filp = NULL;
int ret;
f_list = &tg_filelist;
ret = sem_wait(&f_list->fl_sem);
if (ret < 0) {
PRINTK("sem_wait error, ret=%d\n", ret);
return VFS_ERROR;
}
(VOID)LOS_MuxLock(&g_file_mapping.lock, LOS_WAIT_FOREVER);
for (int i = 3; i < CONFIG_NFILE_DESCRIPTORS; i++) {
if (!get_bit(i)) {
continue;
}
filp = &tg_filelist.fl_files[i];
if (filp->f_path == NULL || strcmp(filp->f_path, old_path)) {
continue;
}
int len = strlen(new_path) + 1;
char *tmp_path = LOS_MemAlloc(m_aucSysMem0, len);
if (tmp_path == NULL) {
PRINT_ERR("%s-%d: Mem alloc failed, path length(%d)\n", __FUNCTION__, __LINE__, len);
ret = VFS_ERROR;
goto out;
}
ret = strncpy_s(tmp_path, strlen(new_path) + 1, new_path, len);
if (ret != 0) {
(VOID)LOS_MemFree(m_aucSysMem0, tmp_path);
PRINT_ERR("%s-%d: strcpy failed.\n", __FUNCTION__, __LINE__);
ret = VFS_ERROR;
goto out;
}
free(filp->f_path);
filp->f_path = tmp_path;
}
ret = LOS_OK;
out:
(VOID)LOS_MuxUnlock(&g_file_mapping.lock);
(void)sem_post(&f_list->fl_sem);
return ret;
}
#ifdef LOSCFG_DEBUG_VERSION
struct file_map* GetFileMappingList(void)
{
return &g_file_mapping;
}
#endif
#endif
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