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james
2024-08-05 20:57:09 +08:00
commit 46d9ee7795
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11
rt-thread/components/dfs/dfs_v2/filesystems/devfs/SConscript Normal file
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# RT-Thread building script for component
from building import *
cwd = GetCurrentDir()
src = Glob('*.c')
CPPPATH = [cwd]
group = DefineGroup('Filesystem', src, depend = ['RT_USING_DFS', 'RT_USING_DFS_DEVFS'], CPPPATH = CPPPATH)
Return('group')

520
rt-thread/components/dfs/dfs_v2/filesystems/devfs/devfs.c Normal file
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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 <sys/unistd.h>
#include <dfs.h>
#include <dfs_fs.h>
#include <dfs_file.h>
#include <dfs_dentry.h>
#include <dfs_mnt.h>
static int dfs_devfs_open(struct dfs_file *file)
{
int ret = RT_EOK;
RT_ASSERT(file != RT_NULL);
RT_ASSERT(file->vnode->ref_count > 0);
if (file->vnode->ref_count > 1)
{
if (file->vnode->type == FT_DIRECTORY
&& !(file->flags & O_DIRECTORY))
{
return -ENOENT;
}
file->fpos = 0;
}
if (!S_ISDIR(file->vnode->mode))
{
rt_device_t device = RT_NULL;
struct dfs_dentry *de = file->dentry;
char *device_name = rt_malloc(DFS_PATH_MAX);
if (!device_name)
{
return -ENOMEM;
}
/* skip `/dev` */
rt_snprintf(device_name, DFS_PATH_MAX, "%s%s", de->mnt->fullpath + sizeof("/dev") - 1, de->pathname);
device = rt_device_find(device_name + 1);
if (device)
{
file->vnode->data = device;
#ifdef RT_USING_POSIX_DEVIO
if (device->fops && device->fops->open)
{
ret = device->fops->open(file);
if (ret == RT_EOK || ret == -RT_ENOSYS)
{
ret = RT_EOK;
}
}
else if (device->ops && file->vnode->ref_count == 1)
#else
if (device->ops && file->vnode->ref_count == 1)
#endif /* RT_USING_POSIX_DEVIO */
{
ret = rt_device_open(device, RT_DEVICE_OFLAG_RDWR);
if (ret == RT_EOK || ret == -RT_ENOSYS)
{
ret = RT_EOK;
}
}
}
}
return ret;
}
static int dfs_devfs_close(struct dfs_file *file)
{
int ret = RT_EOK;
rt_device_t device;
RT_ASSERT(file != RT_NULL);
RT_ASSERT(file->vnode->ref_count > 0);
if (file->vnode && file->vnode->data)
{
/* get device handler */
device = (rt_device_t)file->vnode->data;
#ifdef RT_USING_POSIX_DEVIO
if (device->fops && device->fops->close)
{
ret = device->fops->close(file);
}
else if (file->vnode->ref_count == 1)
#else
if (device->ops && file->vnode->ref_count == 1)
#endif /* RT_USING_POSIX_DEVIO */
{
/* close device handler */
ret = rt_device_close(device);
}
}
return ret;
}
static ssize_t dfs_devfs_read(struct dfs_file *file, void *buf, size_t count, off_t *pos)
{
ssize_t ret = -RT_EIO;
rt_device_t device;
RT_ASSERT(file != RT_NULL);
if (file->vnode && file->vnode->data)
{
/* get device handler */
device = (rt_device_t)file->vnode->data;
#ifdef RT_USING_POSIX_DEVIO
if (device->fops && device->fops->read)
{
ret = device->fops->read(file, buf, count, pos);
}
else
#else
if (device->ops)
#endif /* RT_USING_POSIX_DEVIO */
{
/* read device data */
ret = rt_device_read(device, *pos, buf, count);
*pos += ret;
}
}
return ret;
}
static ssize_t dfs_devfs_write(struct dfs_file *file, const void *buf, size_t count, off_t *pos)
{
ssize_t ret = -RT_EIO;
rt_device_t device;
RT_ASSERT(file != RT_NULL);
if(file->vnode->data)
{
/* get device handler */
device = (rt_device_t)file->vnode->data;
if ((file->dentry->pathname[0] == '/') && (file->dentry->pathname[1] == '\0'))
return -RT_ENOSYS;
#ifdef RT_USING_POSIX_DEVIO
if (device->fops && device->fops->write)
{
ret = device->fops->write(file, buf, count, pos);
}
else
#else
if (device->ops)
#endif /* RT_USING_POSIX_DEVIO */
{
/* read device data */
ret = rt_device_write(device, *pos, buf, count);
*pos += ret;
}
}
return ret;
}
static int dfs_devfs_ioctl(struct dfs_file *file, int cmd, void *args)
{
int ret = RT_EOK;
rt_device_t device;
RT_ASSERT(file != RT_NULL);
if (file->vnode && file->vnode->data)
{
/* get device handler */
device = (rt_device_t)file->vnode->data;
if ((file->dentry->pathname[0] == '/') && (file->dentry->pathname[1] == '\0'))
return -RT_ENOSYS;
#ifdef RT_USING_POSIX_DEVIO
if (device->fops && device->fops->ioctl)
{
ret = device->fops->ioctl(file, cmd, args);
}
else
#endif /* RT_USING_POSIX_DEVIO */
{
ret = rt_device_control(device, cmd, args);
}
}
return ret;
}
static int dfs_devfs_getdents(struct dfs_file *file, struct dirent *dirp, uint32_t count)
{
int ret = -RT_ENOSYS;
RT_ASSERT(file != RT_NULL);
return ret;
}
static int dfs_devfs_poll(struct dfs_file *file, struct rt_pollreq *req)
{
int mask = 0;
rt_device_t device;
RT_ASSERT(file != RT_NULL);
if (file->vnode && file->vnode->data)
{
/* get device handler */
device = (rt_device_t)file->vnode->data;
#ifdef RT_USING_POSIX_DEVIO
if (device->fops && device->fops->poll)
{
mask = device->fops->poll(file, req);
}
#endif /* RT_USING_POSIX_DEVIO */
}
return mask;
}
static int dfs_devfs_flush(struct dfs_file *file)
{
int ret = RT_EOK;
rt_device_t device;
RT_ASSERT(file != RT_NULL);
if (file->vnode && file->vnode->data)
{
/* get device handler */
device = (rt_device_t)file->vnode->data;
#ifdef RT_USING_POSIX_DEVIO
if (device->fops && device->fops->flush)
{
ret = device->fops->flush(file);
}
#endif /* RT_USING_POSIX_DEVIO */
}
return ret;
}
static off_t dfs_devfs_lseek(struct dfs_file *file, off_t offset, int wherece)
{
off_t ret = 0;
rt_device_t device;
RT_ASSERT(file != RT_NULL);
if (file->vnode && file->vnode->data)
{
/* get device handler */
device = (rt_device_t)file->vnode->data;
#ifdef RT_USING_POSIX_DEVIO
if (device->fops && device->fops->lseek)
{
ret = device->fops->lseek(file, offset, wherece);
}
#endif /* RT_USING_POSIX_DEVIO */
}
return ret;
}
static int dfs_devfs_truncate(struct dfs_file *file, off_t offset)
{
int ret = RT_EOK;
rt_device_t device;
RT_ASSERT(file != RT_NULL);
if (file->vnode && file->vnode->data)
{
/* get device handler */
device = (rt_device_t)file->vnode->data;
#ifdef RT_USING_POSIX_DEVIO
if (device->fops && device->fops->truncate)
{
ret = device->fops->truncate(file, offset);
}
#endif /* RT_USING_POSIX_DEVIO */
}
return ret;
}
static int dfs_devfs_mmap(struct dfs_file *file, struct lwp_avl_struct *mmap)
{
int ret = RT_EOK;
rt_device_t device;
RT_ASSERT(file != RT_NULL);
if (file->vnode && file->vnode->data)
{
/* get device handler */
device = (rt_device_t)file->vnode->data;
#ifdef RT_USING_POSIX_DEVIO
if (device->fops && device->fops->mmap)
{
ret = device->fops->mmap(file, mmap);
}
#endif /* RT_USING_POSIX_DEVIO */
}
return ret;
}
static int dfs_devfs_lock(struct dfs_file *file, struct file_lock *flock)
{
int ret = RT_EOK;
rt_device_t device;
RT_ASSERT(file != RT_NULL);
if (file->vnode && file->vnode->data)
{
/* get device handler */
device = (rt_device_t)file->vnode->data;
#ifdef RT_USING_POSIX_DEVIO
if (device->fops && device->fops->lock)
{
ret = device->fops->lock(file, flock);
}
#endif /* RT_USING_POSIX_DEVIO */
}
return ret;
}
static int dfs_devfs_flock(struct dfs_file *file, int operation, struct file_lock *flock)
{
int ret = RT_EOK;
rt_device_t device;
RT_ASSERT(file != RT_NULL);
if (file->vnode && file->vnode->data)
{
/* get device handler */
device = (rt_device_t)file->vnode->data;
#ifdef RT_USING_POSIX_DEVIO
if (device->fops && device->fops->flock)
{
ret = device->fops->flock(file, operation, flock);
}
#endif /* RT_USING_POSIX_DEVIO */
}
return ret;
}
static const struct dfs_file_ops _dev_fops =
{
.open = dfs_devfs_open,
.close = dfs_devfs_close,
.read = dfs_devfs_read,
.write = dfs_devfs_write,
.ioctl = dfs_devfs_ioctl,
.getdents = dfs_devfs_getdents,
.poll = dfs_devfs_poll,
.flush = dfs_devfs_flush,
.lseek = dfs_devfs_lseek,
.truncate = dfs_devfs_truncate,
.mmap = dfs_devfs_mmap,
.lock = dfs_devfs_lock,
.flock = dfs_devfs_flock,
};
const struct dfs_file_ops *dfs_devfs_fops(void)
{
return &_dev_fops;
}
mode_t dfs_devfs_device_to_mode(struct rt_device *device)
{
mode_t 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 void dfs_devfs_mkdir(const char *fullpath, mode_t mode)
{
int len = rt_strlen(fullpath);
char *path = (char *)rt_malloc(len + 1);
if (path)
{
int index = len - 1;
rt_strcpy(path, fullpath);
if (path[index] == '/')
{
path[index] = '\0';
index --;
}
while (path[index] != '/' && index >= 0)
{
index --;
}
path[index] = '\0';
if (index > 0 && access(path, 0) != 0)
{
int i = 0;
if (path[i] == '/')
{
i ++;
}
while (index > i)
{
if (path[i] == '/')
{
path[i] = '\0';
mkdir(path, mode);
path[i] = '/';
}
i ++;
}
mkdir(path, mode);
}
}
}
void dfs_devfs_device_add(rt_device_t device)
{
int fd;
char path[512];
if (device)
{
rt_snprintf(path, 512, "/dev/%s", device->parent.name);
if (access(path, 0) != 0)
{
mode_t mode = dfs_devfs_device_to_mode(device);
dfs_devfs_mkdir(path, mode);
fd = open(path, O_RDWR | O_CREAT, mode);
if (fd >= 0)
{
close(fd);
}
}
}
}
int dfs_devfs_update(void)
{
int count = rt_object_get_length(RT_Object_Class_Device);
if (count > 0)
{
rt_device_t *devices = rt_malloc(count * sizeof(rt_device_t));
if (devices)
{
rt_object_get_pointers(RT_Object_Class_Device, (rt_object_t *)devices, count);
for (int index = 0; index < count; index ++)
{
dfs_devfs_device_add(devices[index]);
}
rt_free(devices);
}
}
return count;
}

18
rt-thread/components/dfs/dfs_v2/filesystems/devfs/devfs.h Normal file
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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
*/
#ifndef __DEVICE_FS_H__
#define __DEVICE_FS_H__
const struct dfs_file_ops *dfs_devfs_fops(void);
mode_t dfs_devfs_device_to_mode(struct rt_device *device);
void dfs_devfs_device_add(rt_device_t device);
int dfs_devfs_update(void);
#endif

678
rt-thread/components/dfs/dfs_v2/filesystems/devfs/devtmpfs.c Normal file
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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-10-24 flybreak the first version
* 2023-02-01 xqyjlj fix cannot open the same file repeatedly in 'w' mode
* 2023-09-20 zmq810150896 adds truncate functionality and standardized unlink adaptations
* 2023-12-02 Shell Support of dynamic device
*/
#include <rthw.h>
#include <rtthread.h>
#include <dfs.h>
#include <dfs_fs.h>
#include <dfs_dentry.h>
#include <dfs_file.h>
#include <dfs_mnt.h>
#include <devfs.h>
#include <unistd.h>
#define TMPFS_MAGIC 0x0B0B0B0B
#define TMPFS_TYPE_FILE 0x00
#define TMPFS_TYPE_DIR 0x01
#define TMPFS_TYPE_DYN_DEV 0x02 /* dynamic device */
struct devtmpfs_sb;
struct devtmpfs_file
{
char name[DIRENT_NAME_MAX]; /* file name */
rt_uint32_t type; /* file type */
rt_list_t subdirs; /* file subdir list */
rt_list_t sibling; /* file sibling list */
struct devtmpfs_sb *sb; /* superblock ptr */
rt_uint32_t mode;
char *link;
};
struct devtmpfs_sb
{
rt_uint32_t magic; /* TMPFS_MAGIC */
struct devtmpfs_file root; /* root dir */
rt_size_t df_size; /* df size */
rt_list_t sibling; /* sb sibling list */
struct rt_spinlock lock; /* tmpfs lock */
};
static struct dfs_file_ops _default_fops = { 0 };
static int _path_separate(const char *path, char *parent_path, char *file_name)
{
const char *path_p, *path_q;
RT_ASSERT(path[0] == '/');
file_name[0] = '\0';
path_p = path_q = &path[1];
__next_dir:
while (*path_q != '/' && *path_q != '\0')
{
path_q++;
}
if (path_q != path_p) /*sub dir*/
{
if (*path_q != '\0')
{
path_q++;
path_p = path_q;
goto __next_dir;
}
else /* Last level dir */
{
rt_memcpy(parent_path, path, path_p - path - 1);
parent_path[path_p - path - 1] = '\0';
rt_memcpy(file_name, path_p, path_q - path_p);
file_name[path_q - path_p] = '\0';
}
}
if (parent_path[0] == 0)
{
parent_path[0] = '/';
parent_path[1] = '\0';
}
//LOG_D("parent_path: %s", parent_path);
//LOG_D("file_name: %s", file_name);
return 0;
}
static int _get_subdir(const char *path, char *name)
{
const char *subpath = path;
while (*subpath == '/' && *subpath)
subpath ++;
while (*subpath != '/' && *subpath)
{
*name = *subpath;
name ++;
subpath ++;
}
return 0;
}
#if 0
static int _free_subdir(struct devtmpfs_file *dfile)
{
struct devtmpfs_file *file;
rt_list_t *list, *temp_list;
struct devtmpfs_sb *superblock;
RT_ASSERT(dfile->type == TMPFS_TYPE_DIR);
rt_list_for_each_safe(list, temp_list, &dfile->subdirs)
{
file = rt_list_entry(list, struct devtmpfs_file, sibling);
if (file->type == TMPFS_TYPE_DIR)
{
_free_subdir(file);
}
if (file->link)
{
rt_free(file->link);
}
superblock = file->sb;
RT_ASSERT(superblock);
rt_spin_lock(&superblock->lock);
rt_list_remove(&(file->sibling));
rt_spin_unlock(&superblock->lock);
rt_free(file);
}
return 0;
}
#endif
static int devtmpfs_mount(struct dfs_mnt *mnt, unsigned long rwflag, const void *data)
{
struct devtmpfs_sb *superblock;
superblock = rt_calloc(1, sizeof(struct devtmpfs_sb));
if (superblock)
{
superblock->df_size = sizeof(struct devtmpfs_sb);
superblock->magic = TMPFS_MAGIC;
rt_list_init(&superblock->sibling);
superblock->root.name[0] = '/';
superblock->root.sb = superblock;
superblock->root.type = TMPFS_TYPE_DIR;
superblock->root.mode = S_IFDIR | (S_IRUSR | S_IRGRP | S_IROTH) | (S_IXUSR | S_IXGRP | S_IXOTH);
rt_list_init(&superblock->root.sibling);
rt_list_init(&superblock->root.subdirs);
rt_spin_lock_init(&superblock->lock);
mnt->data = superblock;
}
else
{
return -RT_ERROR;
}
return RT_EOK;
}
static int devtmpfs_unmount(struct dfs_mnt *mnt)
{
#if 0
struct devtmpfs_sb *superblock;
/* FIXME: don't unmount on busy. */
superblock = (struct devtmpfs_sb *)mnt->data;
RT_ASSERT(superblock != NULL);
mnt->data = NULL;
_free_subdir(&(superblock->root));
rt_free(superblock);
#endif
return -RT_ERROR;
}
static struct devtmpfs_file *devtmpfs_file_lookup(struct devtmpfs_sb *superblock, const char *path)
{
const char *subpath, *curpath, *filename = RT_NULL;
char subdir_name[DIRENT_NAME_MAX];
struct devtmpfs_file *file, *curfile;
rt_list_t *list;
subpath = path;
while (*subpath == '/' && *subpath)
subpath ++;
if (! *subpath) /* is root directory */
{
return &(superblock->root);
}
curpath = subpath;
curfile = &superblock->root;
find_subpath:
while (*subpath != '/' && *subpath)
subpath ++;
if (! *subpath) /* is last directory */
filename = curpath;
else
subpath ++; /* skip '/' */
memset(subdir_name, 0, DIRENT_NAME_MAX);
_get_subdir(curpath, subdir_name);
rt_spin_lock(&superblock->lock);
rt_list_for_each(list, &curfile->subdirs)
{
file = rt_list_entry(list, struct devtmpfs_file, sibling);
if (filename) /* find file */
{
if (rt_strcmp(file->name, filename) == 0)
{
rt_spin_unlock(&superblock->lock);
return file;
}
}
else if (rt_strcmp(file->name, subdir_name) == 0)
{
curpath = subpath;
curfile = file;
rt_spin_unlock(&superblock->lock);
goto find_subpath;
}
}
rt_spin_unlock(&superblock->lock);
/* not found */
return NULL;
}
static int devtmpfs_statfs(struct dfs_mnt *mnt, struct statfs *buf)
{
struct devtmpfs_sb *superblock;
RT_ASSERT(mnt != NULL);
RT_ASSERT(buf != NULL);
superblock = (struct devtmpfs_sb *)mnt->data;
RT_ASSERT(superblock != NULL);
buf->f_bsize = 512;
buf->f_blocks = (superblock->df_size + 511) / 512;
buf->f_bfree = 1;
buf->f_bavail = buf->f_bfree;
return RT_EOK;
}
static int devtmpfs_stat(struct dfs_dentry *dentry, struct stat *st)
{
struct dfs_vnode *vnode;
if (dentry && dentry->vnode)
{
vnode = dentry->vnode;
st->st_dev = (dev_t)(long)(dentry->mnt->dev_id);
st->st_ino = (ino_t)dfs_dentry_full_path_crc32(dentry);
st->st_gid = vnode->gid;
st->st_uid = vnode->uid;
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;
}
return RT_EOK;
}
static int devtmpfs_getdents(struct dfs_file *file, struct dirent *dirp, uint32_t count)
{
struct devtmpfs_file *d_file;
struct devtmpfs_sb *superblock;
RT_ASSERT(file);
RT_ASSERT(file->dentry);
RT_ASSERT(file->dentry->mnt);
superblock = (struct devtmpfs_sb *)file->dentry->mnt->data;
RT_ASSERT(superblock);
d_file = devtmpfs_file_lookup(superblock, file->dentry->pathname);
if (d_file)
{
rt_size_t index, end;
struct dirent *d;
struct devtmpfs_file *n_file;
rt_list_t *list;
/* make integer count */
count = (count / sizeof(struct dirent));
if (count == 0)
{
return -EINVAL;
}
end = file->fpos + count;
index = 0;
count = 0;
rt_list_for_each(list, &d_file->subdirs)
{
if (index >= (rt_size_t)file->fpos)
{
n_file = rt_list_entry(list, struct devtmpfs_file, sibling);
d = dirp + count;
if (n_file->type == TMPFS_TYPE_FILE)
{
d->d_type = DT_REG;
}
if (n_file->type == TMPFS_TYPE_DIR)
{
d->d_type = DT_DIR;
}
d->d_reclen = (rt_uint16_t)sizeof(struct dirent);
rt_strncpy(d->d_name, n_file->name, DIRENT_NAME_MAX);
d->d_namlen = rt_strlen(d->d_name);
count += 1;
file->fpos += 1;
}
index += 1;
if (index >= end)
{
break;
}
}
}
return count * sizeof(struct dirent);
}
static int devtmpfs_symlink(struct dfs_dentry *parent_dentry, const char *target, const char *linkpath)
{
int ret = RT_EOK;
struct devtmpfs_file *p_file, *l_file;
struct devtmpfs_sb *superblock;
RT_ASSERT(parent_dentry);
RT_ASSERT(parent_dentry->mnt);
superblock = (struct devtmpfs_sb *)parent_dentry->mnt->data;
RT_ASSERT(superblock);
p_file = devtmpfs_file_lookup(superblock, parent_dentry->pathname);
if (p_file)
{
l_file = (struct devtmpfs_file *)rt_calloc(1, sizeof(struct devtmpfs_file));
if (l_file)
{
superblock->df_size += sizeof(struct devtmpfs_file);
strncpy(l_file->name, linkpath, DIRENT_NAME_MAX - 1);
rt_list_init(&(l_file->subdirs));
rt_list_init(&(l_file->sibling));
l_file->sb = superblock;
l_file->type = TMPFS_TYPE_FILE;
l_file->mode = p_file->mode;
l_file->mode &= ~S_IFMT;
l_file->mode |= S_IFLNK;
l_file->link = rt_strdup(target);
rt_spin_lock(&superblock->lock);
rt_list_insert_after(&(p_file->subdirs), &(l_file->sibling));
rt_spin_unlock(&superblock->lock);
}
}
return ret;
}
static int devtmpfs_readlink(struct dfs_dentry *dentry, char *buf, int len)
{
int ret = 0;
struct devtmpfs_file *d_file;
struct devtmpfs_sb *superblock;
RT_ASSERT(dentry);
RT_ASSERT(dentry->mnt);
superblock = (struct devtmpfs_sb *)dentry->mnt->data;
RT_ASSERT(superblock);
d_file = devtmpfs_file_lookup(superblock, dentry->pathname);
if (d_file)
{
if (d_file->link)
{
if (d_file->type == TMPFS_TYPE_DYN_DEV)
{
rt_device_t device = (void *)d_file->link;
buf[0] = '\0';
ret = device->readlink(device, buf, len);
if (ret == 0)
{
buf[len - 1] = '\0';
ret = rt_strlen(buf);
}
else
{
ret = 0;
}
}
else
{
rt_strncpy(buf, (const char *)d_file->link, len);
buf[len - 1] = '\0';
ret = rt_strlen(buf);
}
}
}
return ret;
}
static int devtmpfs_unlink(struct dfs_dentry *dentry)
{
struct devtmpfs_file *d_file;
struct devtmpfs_sb *superblock;
RT_ASSERT(dentry);
RT_ASSERT(dentry->mnt);
superblock = (struct devtmpfs_sb *)dentry->mnt->data;
RT_ASSERT(superblock);
d_file = devtmpfs_file_lookup(superblock, dentry->pathname);
if (d_file)
{
if (d_file->link && d_file->type != TMPFS_TYPE_DYN_DEV)
{
rt_free(d_file->link);
}
rt_spin_lock(&superblock->lock);
rt_list_remove(&(d_file->sibling));
rt_spin_unlock(&superblock->lock);
rt_free(d_file);
}
return RT_EOK;
}
static int devtmpfs_setattr(struct dfs_dentry *dentry, struct dfs_attr *attr)
{
struct devtmpfs_file *d_file;
struct devtmpfs_sb *superblock;
RT_ASSERT(dentry);
RT_ASSERT(dentry->mnt);
superblock = (struct devtmpfs_sb *)dentry->mnt->data;
RT_ASSERT(superblock);
d_file = devtmpfs_file_lookup(superblock, dentry->pathname);
if (d_file)
{
d_file->mode &= ~0xFFF;
d_file->mode |= attr->st_mode & 0xFFF;
return RT_EOK;
}
return -RT_ERROR;
}
static struct dfs_vnode *devtmpfs_create_vnode(struct dfs_dentry *dentry, int type, mode_t mode)
{
struct dfs_vnode *vnode = RT_NULL;
struct devtmpfs_sb *superblock;
struct devtmpfs_file *d_file, *p_file;
char parent_path[DFS_PATH_MAX], file_name[DIRENT_NAME_MAX];
if (dentry == NULL || dentry->mnt == NULL || dentry->mnt->data == NULL)
{
return NULL;
}
superblock = (struct devtmpfs_sb *)dentry->mnt->data;
RT_ASSERT(superblock != NULL);
vnode = dfs_vnode_create();
if (vnode)
{
/* find parent file */
_path_separate(dentry->pathname, parent_path, file_name);
if (file_name[0] == '\0') /* it's root dir */
{
dfs_vnode_destroy(vnode);
return NULL;
}
/* open parent directory */
p_file = devtmpfs_file_lookup(superblock, parent_path);
if (p_file == NULL)
{
dfs_vnode_destroy(vnode);
return NULL;
}
/* create a file entry */
d_file = (struct devtmpfs_file *)rt_calloc(1, sizeof(struct devtmpfs_file));
if (d_file == NULL)
{
dfs_vnode_destroy(vnode);
return NULL;
}
superblock->df_size += sizeof(struct devtmpfs_file);
strncpy(d_file->name, file_name, DIRENT_NAME_MAX);
rt_list_init(&(d_file->subdirs));
rt_list_init(&(d_file->sibling));
d_file->sb = superblock;
vnode->nlink = 1;
vnode->size = 0;
vnode->mode = mode;
vnode->mnt = dentry->mnt;
vnode->fops = &_default_fops;
if (type == FT_DIRECTORY)
{
d_file->type = TMPFS_TYPE_DIR;
vnode->type = FT_DIRECTORY;
vnode->mode &= ~S_IFMT;
vnode->mode |= S_IFDIR;
}
else
{
d_file->type = TMPFS_TYPE_FILE;
vnode->type = FT_DEVICE;
}
d_file->mode = vnode->mode;
rt_spin_lock(&superblock->lock);
rt_list_insert_after(&(p_file->subdirs), &(d_file->sibling));
rt_spin_unlock(&superblock->lock);
}
return vnode;
}
static struct dfs_vnode *devtmpfs_lookup(struct dfs_dentry *dentry)
{
struct dfs_vnode *vnode = RT_NULL;
struct devtmpfs_sb *superblock;
struct devtmpfs_file *d_file;
if (dentry == NULL || dentry->mnt == NULL || dentry->mnt->data == NULL)
{
return NULL;
}
superblock = (struct devtmpfs_sb *)dentry->mnt->data;
d_file = devtmpfs_file_lookup(superblock, dentry->pathname);
if (d_file)
{
vnode = dfs_vnode_create();
if (vnode)
{
vnode->nlink = 1;
vnode->size = 0;
vnode->mnt = dentry->mnt;
vnode->fops = &_default_fops;
vnode->mode = d_file->mode;
if (d_file->type == TMPFS_TYPE_DIR)
{
vnode->type = FT_DIRECTORY;
}
else if (d_file->link)
{
vnode->type = FT_SYMLINK;
}
else
{
vnode->type = FT_DEVICE;
}
}
}
else
{
rt_device_t device = RT_NULL;
device = rt_device_find(&dentry->pathname[1]);
if (device)
{
vnode = devtmpfs_create_vnode(dentry, FT_REGULAR, dfs_devfs_device_to_mode(device));
if (device->flag & RT_DEVICE_FLAG_DYNAMIC)
{
d_file = devtmpfs_file_lookup(superblock, dentry->pathname);
d_file->type = TMPFS_TYPE_DYN_DEV;
d_file->link = (char *)device;
}
}
}
return vnode;
}
static int devtmpfs_free_vnode(struct dfs_vnode *vnode)
{
return RT_EOK;
}
static const struct dfs_filesystem_ops _devtmpfs_ops =
{
.name = "devtmpfs",
.flags = DFS_FS_FLAG_DEFAULT,
.default_fops = &_default_fops,
.mount = devtmpfs_mount,
.umount = devtmpfs_unmount,
.symlink = devtmpfs_symlink,
.readlink = devtmpfs_readlink,
.unlink = devtmpfs_unlink,
.setattr = devtmpfs_setattr,
.statfs = devtmpfs_statfs,
.stat = devtmpfs_stat,
.lookup = devtmpfs_lookup,
.create_vnode = devtmpfs_create_vnode,
.free_vnode = devtmpfs_free_vnode
};
static struct dfs_filesystem_type _devtmpfs =
{
.fs_ops = &_devtmpfs_ops,
};
int dfs_devtmpfs_init(void)
{
_default_fops = *dfs_devfs_fops();
_default_fops.getdents = devtmpfs_getdents;
/* register file system */
dfs_register(&_devtmpfs);
dfs_mount(RT_NULL, "/dev", "devtmpfs", 0, RT_NULL);
dfs_devfs_update();
return 0;
}
INIT_COMPONENT_EXPORT(dfs_devtmpfs_init);