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rt-thread-official/components/dfs/dfs_v1/filesystems/devfs/devfs.c

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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2018-02-11 Bernard Ignore O_CREAT flag in open.
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include <dfs.h>
#include <dfs_fs.h>
#include <dfs_file.h>
#include "devfs.h"
struct device_dirent
{
rt_device_t *devices;
rt_uint16_t read_index;
rt_uint16_t device_count;
};
int dfs_device_fs_mount(struct dfs_filesystem *fs, unsigned long rwflag, const void *data)
{
return RT_EOK;
}
int dfs_device_fs_statfs(struct dfs_filesystem *fs, struct statfs *buf)
{
buf->f_bsize = 512;
buf->f_blocks = 2048 * 64; // 64M
buf->f_bfree = buf->f_blocks;
buf->f_bavail = buf->f_bfree;
return RT_EOK;
}
int dfs_device_fs_ioctl(struct dfs_file *file, int cmd, void *args)
{
rt_err_t result;
rt_device_t dev_id;
RT_ASSERT(file != RT_NULL);
/* get device handler */
dev_id = (rt_device_t)file->vnode->data;
RT_ASSERT(dev_id != RT_NULL);
if ((file->vnode->path[0] == '/') && (file->vnode->path[1] == '\0'))
return -RT_ENOSYS;
/* close device handler */
result = rt_device_control(dev_id, cmd, args);
if (result == RT_EOK)
return RT_EOK;
return result;
}
ssize_t dfs_device_fs_read(struct dfs_file *file, void *buf, size_t count)
{
int result;
rt_device_t dev_id;
RT_ASSERT(file != RT_NULL);
/* get device handler */
dev_id = (rt_device_t)file->vnode->data;
RT_ASSERT(dev_id != RT_NULL);
if ((file->vnode->path[0] == '/') && (file->vnode->path[1] == '\0'))
return -RT_ENOSYS;
/* read device data */
result = rt_device_read(dev_id, file->pos, buf, count);
file->pos += result;
return result;
}
ssize_t dfs_device_fs_write(struct dfs_file *file, const void *buf, size_t count)
{
int result;
rt_device_t dev_id;
RT_ASSERT(file != RT_NULL);
/* get device handler */
dev_id = (rt_device_t)file->vnode->data;
RT_ASSERT(dev_id != RT_NULL);
if ((file->vnode->path[0] == '/') && (file->vnode->path[1] == '\0'))
return -RT_ENOSYS;
/* read device data */
result = rt_device_write(dev_id, file->pos, buf, count);
file->pos += result;
return result;
}
int dfs_device_fs_close(struct dfs_file *file)
{
rt_err_t result;
rt_device_t dev_id;
RT_ASSERT(file != RT_NULL);
RT_ASSERT(file->vnode->ref_count > 0);
if (file->vnode->ref_count > 1)
{
return 0;
}
if (file->vnode->type == FT_DIRECTORY && (file->vnode->path[0] == '/') && (file->vnode->path[1] == '\0'))
{
struct device_dirent *root_dirent;
root_dirent = (struct device_dirent *)file->vnode->data;
RT_ASSERT(root_dirent != RT_NULL);
/* release dirent */
rt_free(root_dirent);
return RT_EOK;
}
/* get device handler */
dev_id = (rt_device_t)file->vnode->data;
RT_ASSERT(dev_id != RT_NULL);
/* close device handler */
result = rt_device_close(dev_id);
if (result == RT_EOK)
{
file->vnode->data = RT_NULL;
return RT_EOK;
}
return -EIO;
}
int dfs_device_fs_open(struct dfs_file *file)
{
rt_err_t result;
rt_device_t device;
RT_ASSERT(file->vnode->ref_count > 0);
if (file->vnode->ref_count > 1)
{
file->pos = 0;
return 0;
}
/* open root directory */
if ((file->vnode->path[0] == '/') && (file->vnode->path[1] == '\0') &&
(file->flags & O_DIRECTORY))
{
struct rt_object *object;
struct rt_list_node *node;
struct rt_object_information *information;
struct device_dirent *root_dirent;
rt_uint32_t count = 0;
/* lock scheduler */
rt_enter_critical();
/* traverse device object */
information = rt_object_get_information(RT_Object_Class_Device);
RT_ASSERT(information != RT_NULL);
for (node = information->object_list.next; node != &(information->object_list); node = node->next)
{
count ++;
}
rt_exit_critical();
root_dirent = (struct device_dirent *)rt_malloc(sizeof(struct device_dirent) +
count * sizeof(rt_device_t));
if (root_dirent != RT_NULL)
{
/* lock scheduler */
rt_enter_critical();
root_dirent->devices = (rt_device_t *)(root_dirent + 1);
root_dirent->read_index = 0;
root_dirent->device_count = count;
count = 0;
/* get all device node */
for (node = information->object_list.next; node != &(information->object_list); node = node->next)
{
/* avoid memory write through */
if (count == root_dirent->device_count)
{
rt_kprintf("warning: There are newly added devices that are not displayed!");
break;
}
object = rt_list_entry(node, struct rt_object, list);
root_dirent->devices[count] = (rt_device_t)object;
count ++;
}
rt_exit_critical();
}
/* set data */
file->vnode->data = root_dirent;
return RT_EOK;
}
#ifdef RT_USING_DEV_BUS
else if (file->flags & O_CREAT)
{
if (!(file->flags & O_DIRECTORY))
{
return -ENOSYS;
}
/* regester bus device */
if (rt_device_bus_create(&file->vnode->path[1], 0) == RT_NULL)
{
return -EEXIST;
}
}
#endif
device = rt_device_find(&file->vnode->path[1]);
if (device == RT_NULL)
{
return -ENODEV;
}
#ifdef RT_USING_POSIX_DEVIO
if (device->fops)
{
/* use device fops */
file->vnode->fops = device->fops;
file->vnode->data = (void *)device;
/* use fops */
if (file->vnode->fops->open)
{
result = file->vnode->fops->open(file);
if (result == RT_EOK || result == -RT_ENOSYS)
{
file->vnode->type = FT_DEVICE;
return 0;
}
}
}
else
#endif /* RT_USING_POSIX_DEVIO */
{
result = rt_device_open(device, RT_DEVICE_OFLAG_RDWR);
if (result == RT_EOK || result == -RT_ENOSYS)
{
file->vnode->data = device;
file->vnode->type = FT_DEVICE;
return RT_EOK;
}
}
file->vnode->data = RT_NULL;
/* open device failed. */
return -EIO;
}
int dfs_device_fs_unlink(struct dfs_filesystem *fs, const char *path)
{
#ifdef RT_USING_DEV_BUS
rt_device_t dev_id;
dev_id = rt_device_find(&path[1]);
if (dev_id == RT_NULL)
{
return -1;
}
if (dev_id->type != RT_Device_Class_Bus)
{
return -1;
}
rt_device_bus_destroy(dev_id);
#endif
return RT_EOK;
}
int dfs_device_fs_stat(struct dfs_filesystem *fs, const char *path, struct stat *st)
{
st->st_dev = (dev_t)((size_t)dfs_filesystem_lookup(fs->path));
/* stat root directory */
if ((path[0] == '/') && (path[1] == '\0'))
{
st->st_mode = S_IFREG | S_IRUSR | S_IRGRP | S_IROTH |
S_IWUSR | S_IWGRP | S_IWOTH;
st->st_mode &= ~S_IFREG;
st->st_mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
st->st_size = 0;
st->st_mtime = 0;
return RT_EOK;
}
else
{
rt_device_t dev_id;
dev_id = rt_device_find(&path[1]);
if (dev_id != RT_NULL)
{
st->st_mode = S_IRUSR | S_IRGRP | S_IROTH |
S_IWUSR | S_IWGRP | S_IWOTH;
if (dev_id->type == RT_Device_Class_Char)
st->st_mode |= S_IFCHR;
else if (dev_id->type == RT_Device_Class_Block)
st->st_mode |= S_IFBLK;
else if (dev_id->type == RT_Device_Class_Pipe)
st->st_mode |= S_IFIFO;
else if (dev_id->type == RT_Device_Class_Bus)
st->st_mode |= S_IFDIR;
else
st->st_mode |= S_IFREG;
st->st_size = 0;
st->st_mtime = 0;
return RT_EOK;
}
}
return -ENOENT;
}
int dfs_device_fs_getdents(struct dfs_file *file, struct dirent *dirp, uint32_t count)
{
rt_uint32_t index;
rt_object_t object;
struct dirent *d;
struct device_dirent *root_dirent;
root_dirent = (struct device_dirent *)file->vnode->data;
RT_ASSERT(root_dirent != RT_NULL);
/* make integer count */
count = (count / sizeof(struct dirent));
if (count == 0)
return -EINVAL;
for (index = 0; index < count && index + root_dirent->read_index < root_dirent->device_count;
index ++)
{
object = (rt_object_t)root_dirent->devices[root_dirent->read_index + index];
d = dirp + index;
if ((((rt_device_t)object)->type) == RT_Device_Class_Bus)
{
d->d_type = DT_DIR;
}
else
{
d->d_type = DT_REG;
}
d->d_namlen = RT_NAME_MAX;
d->d_reclen = (rt_uint16_t)sizeof(struct dirent);
rt_strncpy(d->d_name, object->name, RT_NAME_MAX);
}
root_dirent->read_index += index;
return index * sizeof(struct dirent);
}
static int dfs_device_fs_poll(struct dfs_file *fd, struct rt_pollreq *req)
{
int mask = 0;
return mask;
}
static const struct dfs_file_ops _device_fops =
{
dfs_device_fs_open,
dfs_device_fs_close,
dfs_device_fs_ioctl,
dfs_device_fs_read,
dfs_device_fs_write,
RT_NULL, /* flush */
RT_NULL, /* lseek */
dfs_device_fs_getdents,
dfs_device_fs_poll,
};
static const struct dfs_filesystem_ops _device_fs =
{
"devfs",
DFS_FS_FLAG_DEFAULT,
&_device_fops,
dfs_device_fs_mount,
RT_NULL, /*unmount*/
RT_NULL, /*mkfs*/
dfs_device_fs_statfs,
dfs_device_fs_unlink,
dfs_device_fs_stat,
RT_NULL, /*rename*/
};
int devfs_init(void)
{
/* register device file system */
dfs_register(&_device_fs);
return 0;
}
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