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rt-thread-official/components/dfs/dfs_v2/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 <rtdbg.h>
#include <rtdevice.h>
#include <fcntl.h>
#include <errno.h>
#include <dfs.h>
#include <dfs_fs.h>
#include <dfs_file.h>
#include <dfs_dentry.h>
#include <dfs_mnt.h>
#include "devfs.h"
struct device_dirent
{
struct rt_device **devices;
uint32_t device_count;
};
int dfs_devfs_open(struct dfs_file *file);
int dfs_devfs_close(struct dfs_file *file);
off_t generic_dfs_lseek(struct dfs_file *file, off_t offset, int whence);
ssize_t dfs_devfs_read(struct dfs_file *file, void *buf, size_t count, off_t *pos);
ssize_t dfs_devfs_write(struct dfs_file *file, const void *buf, size_t count, off_t *pos);
int dfs_devfs_ioctl(struct dfs_file *file, int cmd, void *args);
int dfs_devfs_getdents(struct dfs_file *file, struct dirent *dirp, uint32_t count);
static int dfs_devfs_poll(struct dfs_file *file, struct rt_pollreq *req);
int dfs_devfs_mount(struct dfs_mnt *mnt, unsigned long rwflag, const void *data);
int dfs_devfs_umount(struct dfs_mnt *mnt);
int dfs_devfs_unlink(struct dfs_dentry *dentry);
int dfs_devfs_stat(struct dfs_dentry *dentry, struct stat *st);
int dfs_devfs_statfs(struct dfs_mnt *mnt, struct statfs *buf);
static struct dfs_vnode *dfs_devfs_lookup(struct dfs_dentry *dentry);
struct dfs_vnode *dfs_devfs_create_vnode(struct dfs_dentry *dentry, int type, mode_t mode);
static int dfs_devfs_free_vnode(struct dfs_vnode *vnode);
static const struct dfs_file_ops _dev_fops =
{
.open = dfs_devfs_open,
.close = dfs_devfs_close,
.lseek = generic_dfs_lseek,
.read = dfs_devfs_read,
.write = dfs_devfs_write,
.ioctl = dfs_devfs_ioctl,
.getdents = dfs_devfs_getdents,
.poll = dfs_devfs_poll,
};
static const struct dfs_filesystem_ops _devfs_ops =
{
.name = "devfs",
.default_fops = &_dev_fops,
.mount = dfs_devfs_mount,
.umount = dfs_devfs_umount,
.unlink = dfs_devfs_unlink,
.stat = dfs_devfs_stat,
.statfs = dfs_devfs_statfs,
.lookup = dfs_devfs_lookup,
.create_vnode = dfs_devfs_create_vnode,
.free_vnode = dfs_devfs_free_vnode,
};
static struct dfs_filesystem_type _devfs =
{
.fs_ops = &_devfs_ops,
};
static int _device_to_mode(struct rt_device *device)
{
int mode = 0;
switch (device->type)
{
case RT_Device_Class_Char:
mode = S_IFCHR | 0777;
break;
case RT_Device_Class_Block:
mode = S_IFBLK | 0777;
break;
case RT_Device_Class_Pipe:
mode = S_IFIFO | 0777;
break;
default:
mode = S_IFCHR | 0777;
break;
}
return mode;
}
static int _devfs_root_dirent_update(struct dfs_vnode *vnode)
{
rt_err_t result = RT_EOK;
if (vnode)
{
// result = rt_mutex_take(&vnode->lock, RT_WAITING_FOREVER);
result = dfs_file_lock();
if (result == RT_EOK)
{
rt_uint32_t count = 0;
struct device_dirent *root_dirent = (struct device_dirent*) vnode->data;
if (root_dirent) rt_free(root_dirent);
count = rt_object_get_length(RT_Object_Class_Device);
root_dirent = (struct device_dirent *)rt_malloc(sizeof(struct device_dirent) + count * sizeof(rt_device_t));
if (root_dirent != RT_NULL)
{
root_dirent->device_count = count;
if (count != 0)
{
root_dirent->devices = (rt_device_t *)(root_dirent + 1);
rt_object_get_pointers(RT_Object_Class_Device, (rt_object_t *)root_dirent->devices, count);
}
else
{
root_dirent->devices = RT_NULL;
}
}
vnode->data = root_dirent;
result = count;
dfs_file_unlock();
}
}
return result;
}
static struct dfs_vnode *dfs_devfs_lookup(struct dfs_dentry *dentry)
{
rt_device_t device = RT_NULL;
struct dfs_vnode *vnode = RT_NULL;
const char *pathname = dentry->pathname;
DLOG(msg, "devfs", "vnode", DLOG_MSG, "dfs_vnode_create");
vnode = dfs_vnode_create();
if (vnode)
{
if (pathname[0] == '/' && pathname[1] == '\0')
{
int count = _devfs_root_dirent_update(vnode);
vnode->mode = S_IFDIR | 0644;
vnode->size = count;
vnode->nlink = 1;
vnode->fops = &_dev_fops;
vnode->mnt = dentry->mnt;
vnode->type = FT_DIRECTORY;
}
else
{
device = rt_device_find(&pathname[1]);
if (!device)
{
DLOG(msg, "devfs", "vnode", DLOG_MSG, "dfs_vnode_destroy(vnode), no-device");
dfs_vnode_destroy(vnode);
vnode = RT_NULL;
}
else
{
vnode->mode = _device_to_mode(device);
vnode->size = device->ref_count;
vnode->nlink = 1;
if (device->fops)
{
vnode->fops = device->fops;
}
else
{
vnode->fops = &_dev_fops;
}
vnode->data = device;
vnode->mnt = dentry->mnt;
vnode->type = FT_DEVICE;
}
}
}
return vnode;
}
struct dfs_vnode *dfs_devfs_create_vnode(struct dfs_dentry *dentry, int type, mode_t mode)
{
#ifdef RT_USING_DEV_BUS
if (dentry && type == FT_DIRECTORY)
{
/* regester bus device */
if (rt_device_bus_create(&dentry->pathname[1], 0))
{
return dfs_devfs_lookup(dentry);
}
}
#endif
return RT_NULL;
}
int dfs_devfs_free_vnode(struct dfs_vnode *vnode)
{
if (S_ISDIR(vnode->mode))
{
struct device_dirent *root_dirent;
root_dirent = (struct device_dirent *)vnode->data;
RT_ASSERT(root_dirent != RT_NULL);
/* release dirent */
DLOG(msg, "devfs", "devfs", DLOG_MSG, "free root_dirent");
rt_free(root_dirent);
return RT_EOK;
}
/* which is a device */
vnode->data = RT_NULL;
return 0;
}
int dfs_devfs_mount(struct dfs_mnt *mnt, unsigned long rwflag, const void *data)
{
RT_ASSERT(mnt != RT_NULL);
rt_atomic_add(&(mnt->ref_count), 1);
mnt->flags |= MNT_IS_LOCKED;
return RT_EOK;
}
int dfs_devfs_umount(struct dfs_mnt *mnt)
{
return RT_EOK;
}
int dfs_devfs_statfs(struct dfs_mnt *mnt, struct statfs *buf)
{
if (mnt && 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_devfs_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->dentry->pathname[0] == '/') && (file->dentry->pathname[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_devfs_read(struct dfs_file *file, void *buf, size_t count, off_t *pos)
{
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->dentry->pathname[0] == '/') && (file->dentry->pathname[1] == '\0'))
return -RT_ENOSYS;
/* read device data */
result = rt_device_read(dev_id, *pos, buf, count);
*pos += result;
return result;
}
ssize_t dfs_devfs_write(struct dfs_file *file, const void *buf, size_t count, off_t *pos)
{
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->dentry->pathname[0] == '/') && (file->dentry->pathname[1] == '\0'))
return -RT_ENOSYS;
/* read device data */
result = rt_device_write(dev_id, *pos, buf, count);
*pos += result;
return result;
}
int dfs_devfs_close(struct dfs_file *file)
{
rt_err_t result = RT_EOK;
rt_device_t device;
RT_ASSERT(file != RT_NULL);
if (!S_ISDIR(file->vnode->mode))
{
/* get device handler */
device = (rt_device_t)file->vnode->data;
RT_ASSERT(device != RT_NULL);
/* close device handler */
result = rt_device_close(device);
}
return result;
}
int dfs_devfs_open(struct dfs_file *file)
{
rt_err_t result = RT_EOK;
/* open root directory */
if ((file->dentry->pathname[0] == '/' && file->dentry->pathname[1] == '\0') ||
(S_ISDIR(file->vnode->mode)))
{
/* re-open the root directory for re-scan devices */
_devfs_root_dirent_update(file->vnode);
return RT_EOK;
}
else
{
rt_device_t device = RT_NULL;
device = (struct rt_device *)file->vnode->data;
if (device)
{
#ifdef RT_USING_POSIX_DEVIO
if (device->fops)
{
/* use device fops */
file->fops = device->fops;
/* use fops->open */
if (file->vnode->fops->open)
{
result = file->vnode->fops->open(file);
if (result == RT_EOK || result == -RT_ENOSYS)
{
return RT_EOK;
}
}
}
else
#endif /* RT_USING_POSIX_DEVIO */
{
result = rt_device_open(device, RT_DEVICE_OFLAG_RDWR);
if (result == RT_EOK || result == -RT_ENOSYS)
{
file->fops = &_dev_fops;
return RT_EOK;
}
}
}
}
/* open device failed. */
return -EIO;
}
int dfs_devfs_unlink(struct dfs_dentry *dentry)
{
#ifdef RT_USING_DEV_BUS
rt_device_t dev_id;
dev_id = rt_device_find(&dentry->pathname[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_devfs_stat(struct dfs_dentry *dentry, struct stat *st)
{
int ret = RT_EOK;
const char *path = RT_NULL;
struct dfs_vnode *vnode = RT_NULL;
if (dentry && dentry->vnode)
{
path = dentry->pathname;
vnode = dentry->vnode;
/* stat root directory */
if ((path[0] == '/') && (path[1] == '\0'))
{
st->st_dev = 0;
st->st_gid = vnode->gid;
st->st_uid = vnode->uid;
st->st_ino = 0;
st->st_mode = vnode->mode;
st->st_nlink = vnode->nlink;
st->st_size = vnode->size;
st->st_mtim.tv_nsec = vnode->mtime.tv_nsec;
st->st_mtim.tv_sec = vnode->mtime.tv_sec;
st->st_ctim.tv_nsec = vnode->ctime.tv_nsec;
st->st_ctim.tv_sec = vnode->ctime.tv_sec;
st->st_atim.tv_nsec = vnode->atime.tv_nsec;
st->st_atim.tv_sec = vnode->atime.tv_sec;
}
else
{
rt_device_t dev_id;
dev_id = rt_device_find(&path[1]);
if (dev_id != RT_NULL)
{
st->st_dev = 0;
st->st_gid = vnode->gid;
st->st_uid = vnode->uid;
st->st_ino = 0;
st->st_mode = vnode->mode;
st->st_nlink = vnode->nlink;
st->st_size = vnode->size;
st->st_mtim.tv_nsec = vnode->mtime.tv_nsec;
st->st_mtim.tv_sec = vnode->mtime.tv_sec;
st->st_ctim.tv_nsec = vnode->ctime.tv_nsec;
st->st_ctim.tv_sec = vnode->ctime.tv_sec;
st->st_atim.tv_nsec = vnode->atime.tv_nsec;
st->st_atim.tv_sec = vnode->atime.tv_sec;
}
else
{
ret = -ENOENT;
}
}
}
return ret;
}
int dfs_devfs_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 + file->fpos < root_dirent->device_count; index ++)
{
object = (rt_object_t)root_dirent->devices[file->fpos + index];
d = dirp + index;
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);
d->d_name[RT_NAME_MAX] = '\0';
}
file->fpos += index;
return index * sizeof(struct dirent);
}
static int dfs_devfs_poll(struct dfs_file *file, struct rt_pollreq *req)
{
int mask = 0;
return mask;
}
int dfs_devfs_init(void)
{
/* register devfs file system */
dfs_register(&_devfs);
dfs_mount(RT_NULL, "/dev", "devfs", 0, RT_NULL);
return 0;
}
INIT_COMPONENT_EXPORT(dfs_devfs_init);
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