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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <fs/devfs.h>
#include <sys/vfs.h>
#include <sys/mount.h>
#include <sys/spinlock.h>
#include <sys/queue.h>
#include <sys/vnode.h>
#include <sys/errno.h>
#include <sys/cdefs.h>
#include <vm/dynalloc.h>
#include <string.h>
struct device_node {
struct spinlock lock;
char *name;
uint8_t is_block : 1;
dev_t major, minor;
TAILQ_ENTRY(device_node) link;
};
static TAILQ_HEAD(, device_node) nodes;
static bool nodelist_init = false;
static struct device_node *
node_from_name(const char *name)
{
struct device_node *n;
TAILQ_FOREACH(n, &nodes, link) {
if (strcmp(n->name, name) == 0) {
return n;
}
}
return NULL;
}
static int
blkdev_read(struct device *dev, struct device_node *node, struct sio_txn *sio)
{
char *buf;
struct sio_txn dev_txn = {0};
size_t buf_size = dev->blocksize * sio->len;
if (dev->blocksize == 0 || sio->len == 0) {
/* Sizes can't be zero! */
return -EIO;
}
spinlock_acquire(&node->lock);
buf = dynalloc_memalign(buf_size, 0x1000);
if (buf == NULL) {
spinlock_release(&node->lock);
return -ENOMEM;
}
dev_txn.len = __DIV_ROUNDUP(sio->len, dev->blocksize);
dev_txn.buf = buf;
dev_txn.offset = sio->offset;
dev->read(dev, &dev_txn);
spinlock_release(&node->lock);
for (size_t i = 0; i < sio->len; ++i) {
((uint8_t *)sio->buf)[i] = buf[i];
}
dynfree(buf);
return sio->len;
}
static int
vop_vget(struct vnode *parent, const char *name, struct vnode **vp)
{
struct device_node *dev;
struct vnode *vnode;
int status, vtype;
if (!nodelist_init) {
return -EIO;
}
if ((dev = node_from_name(name)) == NULL) {
return -ENOENT;
}
vtype = dev->is_block ? VBLK : VCHR;
if ((status = vfs_alloc_vnode(&vnode, NULL, vtype)) != 0) {
return status;
}
vnode->parent = parent;
vnode->data = dev;
vnode->vops = &g_devfs_vops;
*vp = vnode;
return 0;
}
static int
vop_read(struct vnode *vp, struct sio_txn *sio)
{
struct device_node *node;
struct device *dev;
if (vp == NULL) {
return -EIO;
}
node = vp->data;
dev = device_fetch(node->major, node->minor);
return blkdev_read(dev, node, sio);
}
static int
devfs_init(struct fs_info *info)
{
TAILQ_INIT(&nodes);
nodelist_init = true;
return 0;
}
static int
devfs_make_devicenode(const char *name, struct device_node **node_out)
{
size_t name_len = 0;
const char *p = name;
struct device_node *node;
/*
* Only one filename, no paths.
*
* TODO: Do something better here...
*/
for (; *p; ++p, ++name_len) {
if (*p == '/')
return -EINVAL;
}
/* Ensure this filename has valid chars */
if (!vfs_is_valid_path(name)) {
return -EINVAL;
}
node = dynalloc(sizeof(struct device_node));
if (node == NULL)
return -ENOMEM;
node->name = dynalloc(sizeof(char) * name_len);
if (node->name == NULL)
return -ENOMEM;
memcpy(node->name, name, name_len + 1);
*node_out = node;
return 0;
}
int
devfs_add_blkdev(const char *name, const struct device *blkdev)
{
struct device_node *node;
int status;
if ((status = devfs_make_devicenode(name, &node)) != 0) {
return status;
}
node->major = blkdev->major;
node->minor = blkdev->minor;
node->is_block = 1;
TAILQ_INSERT_HEAD(&nodes, node, link);
return 0;
}
struct vfsops g_devfs_ops = {
.init = devfs_init
};
struct vops g_devfs_vops = {
.vget = vop_vget,
.read = vop_read
};
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