448 lines
11 KiB
C
448 lines
11 KiB
C
/*
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* File : dfs_ramfs.c
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* This file is part of Device File System in RT-Thread RTOS
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* COPYRIGHT (C) 2004-2013, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2013-04-15 Bernard the first version
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* 2013-05-05 Bernard remove CRC for ramfs persistence
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* 2013-05-22 Bernard fix the no entry issue.
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*/
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#include <rtthread.h>
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#include <dfs.h>
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#include <dfs_fs.h>
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#include "dfs_ramfs.h"
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int dfs_ramfs_mount(struct dfs_filesystem *fs,
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unsigned long rwflag,
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const void *data)
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{
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struct dfs_ramfs* ramfs;
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if (data == RT_NULL)
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return -DFS_STATUS_EIO;
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ramfs = (struct dfs_ramfs *)data;
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fs->data = ramfs;
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return DFS_STATUS_OK;
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}
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int dfs_ramfs_unmount(struct dfs_filesystem *fs)
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{
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fs->data = RT_NULL;
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return DFS_STATUS_OK;
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}
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int dfs_ramfs_statfs(struct dfs_filesystem *fs, struct statfs *buf)
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{
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struct dfs_ramfs *ramfs;
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ramfs = (struct dfs_ramfs *)fs->data;
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RT_ASSERT(ramfs != RT_NULL);
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RT_ASSERT(buf != RT_NULL);
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buf->f_bsize = 512;
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buf->f_blocks = ramfs->memheap.pool_size/512;
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buf->f_bfree = ramfs->memheap.available_size/512;
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return DFS_STATUS_OK;
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}
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int dfs_ramfs_ioctl(struct dfs_fd *file, int cmd, void *args)
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{
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return -DFS_STATUS_EIO;
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}
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struct ramfs_dirent *dfs_ramfs_lookup(struct dfs_ramfs *ramfs,
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const char *path,
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rt_size_t *size)
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{
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const char *subpath;
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struct ramfs_dirent *dirent;
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subpath = path;
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while (*subpath == '/' && *subpath)
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subpath ++;
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if (! *subpath) /* is root directory */
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{
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*size = 0;
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return &(ramfs->root);
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}
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for (dirent = rt_list_entry(ramfs->root.list.next, struct ramfs_dirent, list);
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dirent != &(ramfs->root);
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dirent = rt_list_entry(dirent->list.next, struct ramfs_dirent, list))
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{
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if (rt_strcmp(dirent->name, subpath) == 0)
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{
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*size = dirent->size;
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return dirent;
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}
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}
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/* not found */
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return RT_NULL;
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}
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int dfs_ramfs_read(struct dfs_fd *file, void *buf, rt_size_t count)
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{
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rt_size_t length;
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struct ramfs_dirent *dirent;
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dirent = (struct ramfs_dirent *)file->data;
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RT_ASSERT(dirent != RT_NULL);
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if (count < file->size - file->pos)
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length = count;
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else
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length = file->size - file->pos;
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if (length > 0)
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memcpy(buf, &(dirent->data[file->pos]), length);
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/* update file current position */
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file->pos += length;
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return length;
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}
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int dfs_ramfs_write(struct dfs_fd *fd, const void *buf, rt_size_t count)
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{
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struct ramfs_dirent *dirent;
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struct dfs_ramfs *ramfs;
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ramfs = (struct dfs_ramfs*)fd->fs->data;
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RT_ASSERT(ramfs != RT_NULL);
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dirent = (struct ramfs_dirent*)fd->data;
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RT_ASSERT(dirent != RT_NULL);
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if (count + fd->pos > fd->size)
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{
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rt_uint8_t *ptr;
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ptr = rt_memheap_realloc(&(ramfs->memheap), dirent->data, fd->pos + count);
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if (ptr == RT_NULL)
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{
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rt_set_errno(-RT_ENOMEM);
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return 0;
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}
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/* update dirent and file size */
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dirent->data = ptr;
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dirent->size = fd->pos + count;
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fd->size = dirent->size;
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}
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if (count > 0)
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memcpy(dirent->data + fd->pos, buf, count);
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/* update file current position */
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fd->pos += count;
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return count;
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}
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int dfs_ramfs_lseek(struct dfs_fd *file, rt_off_t offset)
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{
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if (offset <= (rt_off_t)file->size)
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{
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file->pos = offset;
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return file->pos;
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}
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return -DFS_STATUS_EIO;
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}
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int dfs_ramfs_close(struct dfs_fd *file)
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{
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file->data = RT_NULL;
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return DFS_STATUS_OK;
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}
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int dfs_ramfs_open(struct dfs_fd *file)
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{
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rt_size_t size;
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struct dfs_ramfs *ramfs;
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struct ramfs_dirent *dirent;
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ramfs = (struct dfs_ramfs *)file->fs->data;
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RT_ASSERT(ramfs != RT_NULL);
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if (file->flags & DFS_O_DIRECTORY)
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{
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if (file->flags & DFS_O_CREAT)
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{
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return -DFS_STATUS_ENOSPC;
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}
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/* open directory */
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dirent = dfs_ramfs_lookup(ramfs, file->path, &size);
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if (dirent == RT_NULL)
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return -DFS_STATUS_ENOENT;
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if (dirent == &(ramfs->root)) /* it's root directory */
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{
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if (!(file->flags & DFS_O_DIRECTORY))
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{
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return -DFS_STATUS_ENOENT;
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}
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}
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}
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else
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{
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dirent = dfs_ramfs_lookup(ramfs, file->path, &size);
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if (dirent == &(ramfs->root)) /* it's root directory */
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{
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return -DFS_STATUS_ENOENT;
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}
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if (dirent == RT_NULL)
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{
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if (file->flags & DFS_O_CREAT || file->flags & DFS_O_WRONLY)
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{
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char *name_ptr;
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/* create a file entry */
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dirent = (struct ramfs_dirent *)
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rt_memheap_alloc(&(ramfs->memheap),
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sizeof(struct ramfs_dirent));
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if (dirent == RT_NULL)
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{
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return -DFS_STATUS_ENOMEM;
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}
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/* remove '/' separator */
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name_ptr = file->path;
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while (*name_ptr == '/' && *name_ptr)
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name_ptr ++;
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strncpy(dirent->name, name_ptr, RAMFS_NAME_MAX);
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rt_list_init(&(dirent->list));
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dirent->data = RT_NULL;
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dirent->size = 0;
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/* add to the root directory */
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rt_list_insert_after(&(ramfs->root.list), &(dirent->list));
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}
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else
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return -DFS_STATUS_ENOENT;
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}
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/* Creates a new file.
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* If the file is existing, it is truncated and overwritten.
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*/
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if (file->flags & DFS_O_TRUNC)
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{
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dirent->size = 0;
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if (dirent->data != RT_NULL)
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{
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rt_memheap_free(dirent->data);
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dirent->data = RT_NULL;
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}
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}
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}
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file->data = dirent;
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file->size = dirent->size;
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if (file->flags & DFS_O_APPEND)
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file->pos = file->size;
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else
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file->pos = 0;
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return DFS_STATUS_OK;
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}
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int dfs_ramfs_stat(struct dfs_filesystem *fs,
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const char *path,
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struct stat *st)
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{
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rt_size_t size;
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struct ramfs_dirent *dirent;
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struct dfs_ramfs *ramfs;
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ramfs = (struct dfs_ramfs *)fs->data;
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dirent = dfs_ramfs_lookup(ramfs, path, &size);
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if (dirent == RT_NULL)
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return -DFS_STATUS_ENOENT;
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st->st_dev = 0;
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st->st_mode = DFS_S_IFREG | DFS_S_IRUSR | DFS_S_IRGRP | DFS_S_IROTH |
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DFS_S_IWUSR | DFS_S_IWGRP | DFS_S_IWOTH;
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st->st_size = dirent->size;
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st->st_mtime = 0;
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st->st_blksize = 512;
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return DFS_STATUS_OK;
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}
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int dfs_ramfs_getdents(struct dfs_fd *file,
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struct dirent *dirp,
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rt_uint32_t count)
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{
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rt_size_t index, end;
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struct dirent *d;
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struct ramfs_dirent *dirent;
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struct dfs_ramfs *ramfs;
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ramfs = (struct dfs_ramfs *)file->fs->data;
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dirent = (struct ramfs_dirent *)file->data;
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if (dirent != &(ramfs->root))
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return -DFS_STATUS_EINVAL;
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/* make integer count */
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count = (count / sizeof(struct dirent));
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if (count == 0)
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return -DFS_STATUS_EINVAL;
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end = file->pos + count;
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index = 0;
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count = 0;
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for (dirent = rt_list_entry(dirent->list.next, struct ramfs_dirent, list);
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dirent != &(ramfs->root) && index < end;
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dirent = rt_list_entry(dirent->list.next, struct ramfs_dirent, list))
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{
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if (index >= (rt_size_t)file->pos)
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{
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d = dirp + count;
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d->d_type = DFS_DT_REG;
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d->d_namlen = RT_NAME_MAX;
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d->d_reclen = (rt_uint16_t)sizeof(struct dirent);
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rt_strncpy(d->d_name, dirent->name, RAMFS_NAME_MAX);
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count += 1;
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file->pos += 1;
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}
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index += 1;
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}
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return count * sizeof(struct dirent);
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}
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int dfs_ramfs_unlink(struct dfs_filesystem *fs, const char *path)
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{
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rt_size_t size;
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struct dfs_ramfs *ramfs;
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struct ramfs_dirent *dirent;
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ramfs = (struct dfs_ramfs *)fs->data;
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RT_ASSERT(ramfs != RT_NULL);
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dirent = dfs_ramfs_lookup(ramfs, path, &size);
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if (dirent == RT_NULL)
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return -DFS_STATUS_ENOENT;
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rt_list_remove(&(dirent->list));
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if (dirent->data != RT_NULL)
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rt_memheap_free(dirent->data);
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rt_memheap_free(dirent);
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return DFS_STATUS_OK;
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}
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int dfs_ramfs_rename(struct dfs_filesystem *fs,
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const char *oldpath,
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const char *newpath)
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{
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struct ramfs_dirent *dirent;
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struct dfs_ramfs *ramfs;
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rt_size_t size;
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ramfs = (struct dfs_ramfs *)fs->data;
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RT_ASSERT(ramfs != RT_NULL);
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dirent = dfs_ramfs_lookup(ramfs, newpath, &size);
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if (dirent != RT_NULL)
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return -DFS_STATUS_EEXIST;
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dirent = dfs_ramfs_lookup(ramfs, oldpath, &size);
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if (dirent == RT_NULL)
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return -DFS_STATUS_ENOENT;
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strncpy(dirent->name, newpath, RAMFS_NAME_MAX);
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return DFS_STATUS_OK;
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}
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static const struct dfs_filesystem_operation _ramfs =
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{
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"ram",
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DFS_FS_FLAG_DEFAULT,
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dfs_ramfs_mount,
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dfs_ramfs_unmount,
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RT_NULL, /* mkfs */
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dfs_ramfs_statfs,
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dfs_ramfs_open,
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dfs_ramfs_close,
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dfs_ramfs_ioctl,
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dfs_ramfs_read,
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dfs_ramfs_write,
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RT_NULL, /* flush */
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dfs_ramfs_lseek,
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dfs_ramfs_getdents,
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dfs_ramfs_unlink,
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dfs_ramfs_stat,
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dfs_ramfs_rename,
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};
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int dfs_ramfs_init(void)
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{
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/* register ram file system */
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dfs_register(&_ramfs);
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return 0;
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}
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struct dfs_ramfs* dfs_ramfs_create(rt_uint8_t *pool, rt_size_t size)
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{
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struct dfs_ramfs *ramfs;
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rt_uint8_t *data_ptr;
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rt_err_t result;
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size = RT_ALIGN_DOWN(size, RT_ALIGN_SIZE);
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ramfs = (struct dfs_ramfs *)pool;
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data_ptr = (rt_uint8_t *)(ramfs + 1);
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size = size - sizeof(struct dfs_ramfs);
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size = RT_ALIGN_DOWN(size, RT_ALIGN_SIZE);
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result = rt_memheap_init(&ramfs->memheap, "ramfs", data_ptr, size);
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if (result != RT_EOK)
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return RT_NULL;
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/* detach this memheap object from the system */
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rt_object_detach((rt_object_t)&(ramfs->memheap));
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/* initialize ramfs object */
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ramfs->magic = RAMFS_MAGIC;
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/* initialize root directory */
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memset(&(ramfs->root), 0x00, sizeof(ramfs->root));
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rt_list_init(&(ramfs->root.list));
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ramfs->root.size = 0;
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strcpy(ramfs->root.name, ".");
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return ramfs;
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}
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