rt-thread/components/dfs/dfs_v2/filesystems/mqueue/dfs_mqueue.c

236 lines
6.5 KiB
C

/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-07-04 zhkag first Version
*/
#include <rtthread.h>
#include <rthw.h>
#include <dfs.h>
#include <dfs_fs.h>
#include <dfs_file.h>
#include <dfs_dentry.h>
#include <dfs_mnt.h>
#include "dfs_mqueue.h"
static rt_list_t _mqueue_file_list = RT_LIST_OBJECT_INIT(_mqueue_file_list);
struct rt_spinlock mqueue_lock;
void dfs_mqueue_insert_after(rt_list_t *n) {
rt_spin_lock(&mqueue_lock);
rt_list_insert_after(&(_mqueue_file_list), n);
rt_spin_unlock(&mqueue_lock);
}
struct mqueue_file *dfs_mqueue_lookup(const char *path, rt_size_t *size) {
struct mqueue_file *file;
rt_list_t *node;
rt_spin_lock(&mqueue_lock);
rt_list_for_each(node, &_mqueue_file_list) {
file = rt_list_entry(node, struct mqueue_file, list);
if (rt_strncmp(file->name, path, RT_NAME_MAX) == 0) {
*size = file->size;
rt_spin_unlock(&mqueue_lock);
return file;
}
}
rt_spin_unlock(&mqueue_lock);
return RT_NULL;
}
int dfs_mqueue_mount(struct dfs_mnt *mnt, unsigned long rwflag, const void *data) {
return RT_EOK;
}
int dfs_mqueue_umount(struct dfs_mnt *mnt) {
return RT_EOK;
}
int dfs_mqueue_statfs(struct dfs_mnt *mnt, struct statfs *buf) {
return RT_EOK;
}
int dfs_mqueue_close(struct dfs_file *file) {
return RT_EOK;
}
int dfs_mqueue_open(struct dfs_file *file) {
return 0;
}
int dfs_mqueue_stat(struct dfs_dentry *dentry, struct stat *st) {
struct dfs_vnode *vnode = RT_NULL;
if (dentry && dentry->vnode) {
vnode = dentry->vnode;
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;
}
return RT_EOK;
}
int dfs_mqueue_getdents(struct dfs_file *file, struct dirent *dirp, uint32_t count) {
rt_size_t index, end;
struct dirent *d;
count = (count / sizeof(struct dirent));
end = file->fpos + count;
index = 0;
count = 0;
struct mqueue_file *mq_file;
rt_list_t *node;
rt_spin_lock(&mqueue_lock);
rt_list_for_each(node, &_mqueue_file_list) {
if (index >= (rt_size_t)file->fpos) {
mq_file = rt_list_entry(node, struct mqueue_file, list);
d = dirp + count;
d->d_namlen = RT_NAME_MAX;
d->d_reclen = (rt_uint16_t)sizeof(struct dirent);
rt_strncpy(d->d_name, mq_file->name, RT_NAME_MAX);
count += 1;
file->fpos += 1;
}
index += 1;
if (index >= end) {
break;
}
}
rt_spin_unlock(&mqueue_lock);
return count * sizeof(struct dirent);
}
int dfs_mqueue_unlink(struct dfs_dentry *dentry) {
rt_size_t size;
struct mqueue_file *mq_file;
mq_file = dfs_mqueue_lookup(dentry->pathname + 1, &size);
if (mq_file == RT_NULL)
return -ENOENT;
rt_list_remove(&(mq_file->list));
if (mq_file->data != RT_NULL)
rt_mq_delete((rt_mq_t)mq_file->data);
rt_free(mq_file);
return RT_EOK;
}
static struct dfs_vnode *dfs_mqueue_create_vnode(struct dfs_dentry *dentry, int type, mode_t mode) {
struct dfs_vnode *vnode = RT_NULL;
rt_size_t size;
struct mqueue_file *mq_file;
if (dentry == NULL || dentry->mnt == NULL) {
return NULL;
}
vnode = dfs_vnode_create();
if (vnode) {
mq_file = dfs_mqueue_lookup(dentry->pathname + 1, &size);
if (mq_file == RT_NULL) {
mq_file = (struct mqueue_file *)rt_malloc(sizeof(struct mqueue_file));
if (mq_file == RT_NULL) {
return NULL;
}
mq_file->msg_size = 8192;
mq_file->max_msgs = 10;
strncpy(mq_file->name, dentry->pathname + 1, RT_NAME_MAX);
dfs_mqueue_insert_after(&(mq_file->list));
}
vnode->mode = S_IFREG | mode;
vnode->type = FT_REGULAR;
rt_mq_t mq = rt_mq_create(dentry->pathname + 1, mq_file->msg_size, mq_file->max_msgs,
RT_IPC_FLAG_FIFO);
mq_file->data = (void *)mq;
vnode->data = mq_file;
vnode->size = 0;
}
return vnode;
}
static int dfs_mqueue_free_vnode(struct dfs_vnode *vnode) {
/* nothing to be freed */
if (vnode && vnode->ref_count <= 1) {
vnode->data = NULL;
}
return 0;
}
static const struct dfs_file_ops _mqueue_fops = {
.open = dfs_mqueue_open,
.close = dfs_mqueue_close,
.getdents = dfs_mqueue_getdents,
};
struct dfs_vnode *_dfs_mqueue_lookup(struct dfs_dentry *dentry) {
struct dfs_vnode *vnode = RT_NULL;
rt_size_t size;
// struct tmpfs_sb *superblock;
struct mqueue_file *mq_file;
if (dentry == NULL || dentry->mnt == NULL) {
return NULL;
}
if (dentry->pathname[0] == '/' && dentry->pathname[1] == '\0') {
}
mq_file = dfs_mqueue_lookup(dentry->pathname + 1, &size);
vnode = dfs_vnode_create();
if (mq_file && mq_file->data) {
vnode->mode = S_IFREG | S_IRUSR | S_IWUSR | S_IXUSR;
vnode->type = FT_REGULAR;
vnode->mnt = dentry->mnt;
vnode->data = mq_file;
vnode->size = mq_file->size;
} else {
vnode->size = 0;
vnode->nlink = 1;
vnode->fops = &_mqueue_fops;
vnode->mnt = dentry->mnt;
vnode->type = FT_DIRECTORY;
vnode->mode = S_IFDIR | S_IRUSR | S_IWUSR | S_IXUSR;
}
return vnode;
}
static const struct dfs_filesystem_ops _mqueue_ops = {
.name = "mqueue",
.flags = DFS_FS_FLAG_DEFAULT,
.default_fops = &_mqueue_fops,
.mount = dfs_mqueue_mount,
.umount = dfs_mqueue_umount,
.statfs = dfs_mqueue_statfs,
.unlink = dfs_mqueue_unlink,
.stat = dfs_mqueue_stat,
.lookup = _dfs_mqueue_lookup,
.create_vnode = dfs_mqueue_create_vnode,
.free_vnode = dfs_mqueue_free_vnode
};
static struct dfs_filesystem_type _mqueue = {
.fs_ops = &_mqueue_ops,
};
int dfs_mqueue_init(void) {
/* register mqueue file system */
return dfs_register(&_mqueue);
}
INIT_COMPONENT_EXPORT(dfs_mqueue_init);