454 lines
10 KiB
C
454 lines
10 KiB
C
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/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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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_file.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 == NULL)
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return -EIO;
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ramfs = (struct dfs_ramfs *)data;
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fs->data = ramfs;
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return RT_EOK;
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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 = NULL;
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return RT_EOK;
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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 != NULL);
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RT_ASSERT(buf != 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 RT_EOK;
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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 -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 NULL;
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}
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int dfs_ramfs_read(struct dfs_fd *file, void *buf, 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 != 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, 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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dirent = (struct ramfs_dirent*)fd->data;
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RT_ASSERT(dirent != NULL);
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ramfs = dirent->fs;
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RT_ASSERT(ramfs != 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 == NULL)
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{
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rt_set_errno(-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, off_t offset)
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{
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if (offset <= (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 -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 = NULL;
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return RT_EOK;
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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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struct dfs_filesystem *fs;
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fs = (struct dfs_filesystem *)file->data;
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ramfs = (struct dfs_ramfs *)fs->data;
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RT_ASSERT(ramfs != NULL);
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if (file->flags & O_DIRECTORY)
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{
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if (file->flags & O_CREAT)
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{
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return -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 == NULL)
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return -ENOENT;
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if (dirent == &(ramfs->root)) /* it's root directory */
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{
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if (!(file->flags & O_DIRECTORY))
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{
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return -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 -ENOENT;
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}
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if (dirent == NULL)
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{
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if (file->flags & O_CREAT || file->flags & 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 == NULL)
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{
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return -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 = NULL;
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dirent->size = 0;
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dirent->fs = ramfs;
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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 -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 & O_TRUNC)
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{
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dirent->size = 0;
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if (dirent->data != NULL)
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{
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rt_memheap_free(dirent->data);
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dirent->data = 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 & 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 0;
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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 == NULL)
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return -ENOENT;
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st->st_dev = 0;
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st->st_mode = S_IFREG | S_IRUSR | S_IRGRP | S_IROTH |
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S_IWUSR | S_IWGRP | S_IWOTH;
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st->st_size = dirent->size;
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st->st_mtime = 0;
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return RT_EOK;
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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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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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dirent = (struct ramfs_dirent *)file->data;
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ramfs = dirent->fs;
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RT_ASSERT(ramfs != RT_NULL);
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if (dirent != &(ramfs->root))
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return -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 -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 = 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 != NULL);
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dirent = dfs_ramfs_lookup(ramfs, path, &size);
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if (dirent == NULL)
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return -ENOENT;
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rt_list_remove(&(dirent->list));
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if (dirent->data != NULL)
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rt_memheap_free(dirent->data);
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rt_memheap_free(dirent);
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return RT_EOK;
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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 != NULL);
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dirent = dfs_ramfs_lookup(ramfs, newpath, &size);
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if (dirent != NULL)
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return -EEXIST;
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dirent = dfs_ramfs_lookup(ramfs, oldpath, &size);
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if (dirent == NULL)
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return -ENOENT;
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strncpy(dirent->name, newpath, RAMFS_NAME_MAX);
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return RT_EOK;
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}
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static const struct dfs_file_ops _ram_fops =
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{
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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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NULL, /* flush */
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dfs_ramfs_lseek,
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dfs_ramfs_getdents,
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};
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static const struct dfs_filesystem_ops _ramfs =
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{
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"ram",
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DFS_FS_FLAG_DEFAULT,
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&_ram_fops,
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dfs_ramfs_mount,
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dfs_ramfs_unmount,
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NULL, /* mkfs */
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dfs_ramfs_statfs,
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dfs_ramfs_unlink,
|
||
|
|
dfs_ramfs_stat,
|
||
|
|
dfs_ramfs_rename,
|
||
|
|
};
|
||
|
|
|
||
|
|
int dfs_ramfs_init(void)
|
||
|
|
{
|
||
|
|
/* register ram file system */
|
||
|
|
dfs_register(&_ramfs);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
INIT_COMPONENT_EXPORT(dfs_ramfs_init);
|
||
|
|
|
||
|
|
struct dfs_ramfs* dfs_ramfs_create(rt_uint8_t *pool, rt_size_t size)
|
||
|
|
{
|
||
|
|
struct dfs_ramfs *ramfs;
|
||
|
|
rt_uint8_t *data_ptr;
|
||
|
|
rt_err_t result;
|
||
|
|
|
||
|
|
size = RT_ALIGN_DOWN(size, RT_ALIGN_SIZE);
|
||
|
|
ramfs = (struct dfs_ramfs *)pool;
|
||
|
|
|
||
|
|
data_ptr = (rt_uint8_t *)(ramfs + 1);
|
||
|
|
size = size - sizeof(struct dfs_ramfs);
|
||
|
|
size = RT_ALIGN_DOWN(size, RT_ALIGN_SIZE);
|
||
|
|
|
||
|
|
result = rt_memheap_init(&ramfs->memheap, "ramfs", data_ptr, size);
|
||
|
|
if (result != RT_EOK)
|
||
|
|
return NULL;
|
||
|
|
/* detach this memheap object from the system */
|
||
|
|
rt_object_detach((rt_object_t)&(ramfs->memheap));
|
||
|
|
|
||
|
|
/* initialize ramfs object */
|
||
|
|
ramfs->magic = RAMFS_MAGIC;
|
||
|
|
ramfs->memheap.parent.type = RT_Object_Class_MemHeap | RT_Object_Class_Static;
|
||
|
|
|
||
|
|
/* initialize root directory */
|
||
|
|
memset(&(ramfs->root), 0x00, sizeof(ramfs->root));
|
||
|
|
rt_list_init(&(ramfs->root.list));
|
||
|
|
ramfs->root.size = 0;
|
||
|
|
strcpy(ramfs->root.name, ".");
|
||
|
|
ramfs->root.fs = ramfs;
|
||
|
|
|
||
|
|
return ramfs;
|
||
|
|
}
|
||
|
|
|