280 lines
7.4 KiB
C
280 lines
7.4 KiB
C
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/*
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* Copyright (c) 2021-2021 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 "proc_file.h"
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#include <sys/statfs.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "fs/dirent_fs.h"
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#include "los_tables.h"
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#include "internal.h"
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#define PROCFS_DEFAULT_MODE 0555
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#ifdef LOSCFG_FS_PROC
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static struct VnodeOps g_procfsVops;
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static struct file_operations_vfs g_procfsFops;
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static struct ProcDirEntry *VnodeToEntry(struct Vnode *node)
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{
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return (struct ProcDirEntry *)(node->data);
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}
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static struct Vnode *EntryToVnode(struct ProcDirEntry *entry)
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{
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struct Vnode *node = NULL;
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(void)VnodeAlloc(&g_procfsVops, &node);
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node->fop = &g_procfsFops;
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node->data = entry;
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node->type = entry->type;
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if (node->type == VNODE_TYPE_DIR) {
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node->mode = S_IFDIR | PROCFS_DEFAULT_MODE;
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} else {
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node->mode = S_IFREG | PROCFS_DEFAULT_MODE;
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}
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return node;
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}
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static int EntryMatch(const char *name, int len, const struct ProcDirEntry *pn)
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{
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if (len != pn->nameLen) {
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return 0;
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}
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return !strncmp(name, pn->name, len);
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}
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int VfsProcfsRead(struct file *filep, char *buffer, size_t buflen)
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{
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ssize_t size;
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struct ProcDirEntry *entry = NULL;
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if ((filep == NULL) || (filep->f_vnode == NULL) || (buffer == NULL)) {
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return -EINVAL;
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}
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entry = VnodeToEntry(filep->f_vnode);
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size = (ssize_t)ReadProcFile(entry, (void *)buffer, buflen);
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filep->f_pos = entry->pf->fPos;
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return size;
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}
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int VfsProcfsLookup(struct Vnode *parent, const char *name, int len, struct Vnode **vpp)
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{
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if (parent == NULL || name == NULL || len <= 0 || vpp == NULL) {
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return -EINVAL;
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}
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struct ProcDirEntry *entry = VnodeToEntry(parent);
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if (entry == NULL) {
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return -ENODATA;
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}
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entry = entry->subdir;
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while (1) {
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if (entry == NULL) {
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return -ENOENT;
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}
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if (EntryMatch(name, len, entry)) {
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break;
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}
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entry = entry->next;
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}
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*vpp = EntryToVnode(entry);
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if ((*vpp) == NULL) {
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return -ENOMEM;
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}
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(*vpp)->originMount = parent->originMount;
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(*vpp)->parent = parent;
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return LOS_OK;
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}
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int VfsProcfsMount(struct Mount *mnt, struct Vnode *device, const void *data)
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{
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struct Vnode *vp = NULL;
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int ret;
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spin_lock_init(&procfsLock);
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procfsInit = true;
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ret = VnodeAlloc(&g_procfsVops, &vp);
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if (ret != 0) {
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return -ENOMEM;
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}
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struct ProcDirEntry *root = GetProcRootEntry();
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vp->data = root;
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vp->originMount = mnt;
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vp->fop = &g_procfsFops;
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mnt->data = NULL;
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mnt->vnodeCovered = vp;
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vp->type = root->type;
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if (vp->type == VNODE_TYPE_DIR) {
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vp->mode = S_IFDIR | PROCFS_DEFAULT_MODE;
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} else {
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vp->mode = S_IFREG | PROCFS_DEFAULT_MODE;
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}
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return LOS_OK;
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}
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int VfsProcfsUnmount(void *handle, struct Vnode **blkdriver)
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{
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(void)handle;
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(void)blkdriver;
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return -EPERM;
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}
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int VfsProcfsStat(struct Vnode *node, struct stat *buf)
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{
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struct ProcDirEntry *entry = VnodeToEntry(node);
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(void)memset_s(buf, sizeof(struct stat), 0, sizeof(struct stat));
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buf->st_mode = entry->mode;
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return LOS_OK;
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}
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int VfsProcfsReaddir(struct Vnode *node, struct fs_dirent_s *dir)
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{
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int result;
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char *buffer = NULL;
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int buflen = NAME_MAX;
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unsigned int min_size;
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unsigned int dst_name_size;
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struct ProcDirEntry *pde = NULL;
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int i = 0;
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if (dir == NULL) {
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return -EINVAL;
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}
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if (node->type != VNODE_TYPE_DIR) {
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return -ENOTDIR;
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}
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pde = VnodeToEntry(node);
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while ((i < MAX_DIRENT_NUM) || (i < dir->read_cnt)) {
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buffer = (char *)zalloc(sizeof(char) * NAME_MAX);
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if (buffer == NULL) {
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PRINT_ERR("malloc failed\n");
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return -ENOMEM;
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}
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result = ReadProcFile(pde, (void *)buffer, buflen);
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if (result != ENOERR) {
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free(buffer);
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break;
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}
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dst_name_size = sizeof(dir->fd_dir[i].d_name);
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min_size = (dst_name_size < NAME_MAX) ? dst_name_size : NAME_MAX;
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result = strncpy_s(dir->fd_dir[i].d_name, dst_name_size, buffer, min_size);
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if (result != EOK) {
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free(buffer);
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return -ENAMETOOLONG;
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}
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dir->fd_dir[i].d_name[dst_name_size - 1] = '\0';
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dir->fd_position++;
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dir->fd_dir[i].d_off = dir->fd_position;
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dir->fd_dir[i].d_reclen = (uint16_t)sizeof(struct dirent);
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i++;
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free(buffer);
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}
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return i;
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}
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int VfsProcfsOpendir(struct Vnode *node, struct fs_dirent_s *dir)
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{
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struct ProcDirEntry *pde = VnodeToEntry(node);
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if (pde == NULL) {
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return -EINVAL;
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}
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pde->pdirCurrent = pde->subdir;
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pde->pf->fPos = 0;
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return LOS_OK;
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}
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int VfsProcfsOpen(struct file *filep)
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{
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if (filep == NULL) {
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return -EINVAL;
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}
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struct Vnode *node = filep->f_vnode;
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struct ProcDirEntry *pde = VnodeToEntry(node);
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if (ProcOpen(pde->pf) != OK) {
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return -ENOMEM;
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}
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filep->f_priv = (void *)pde;
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return LOS_OK;
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}
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int VfsProcfsClose(struct file *filep)
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{
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int result = 0;
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if (filep == NULL) {
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return -EINVAL;
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}
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struct Vnode *node = filep->f_vnode;
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struct ProcDirEntry *pde = VnodeToEntry(node);
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pde->pf->fPos = 0;
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if ((pde->procFileOps != NULL) && (pde->procFileOps->release != NULL)) {
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result = pde->procFileOps->release((struct Vnode *)pde, pde->pf);
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}
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LosBufRelease(pde->pf->sbuf);
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pde->pf->sbuf = NULL;
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return result;
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}
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const struct MountOps procfs_operations = {
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.Mount = VfsProcfsMount,
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.Unmount = NULL,
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};
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static struct VnodeOps g_procfsVops = {
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.Lookup = VfsProcfsLookup,
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.Getattr = VfsProcfsStat,
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.Readdir = VfsProcfsReaddir,
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.Opendir = VfsProcfsOpendir,
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};
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static struct file_operations_vfs g_procfsFops = {
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.read = VfsProcfsRead,
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.open = VfsProcfsOpen,
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.close = VfsProcfsClose
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};
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FSMAP_ENTRY(procfs_fsmap, "procfs", procfs_operations, FALSE, FALSE);
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#endif
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