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-rw-r--r--sys/fs/devfs.c295
1 files changed, 0 insertions, 295 deletions
diff --git a/sys/fs/devfs.c b/sys/fs/devfs.c
deleted file mode 100644
index 7fcdbad..0000000
--- a/sys/fs/devfs.c
+++ /dev/null
@@ -1,295 +0,0 @@
-/*
- * 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
-cdev_read(struct device *dev, struct device_node *node, struct sio_txn *sio)
-{
- size_t n_bytes;
-
- spinlock_acquire(&node->lock);
- n_bytes = dev->read(dev, sio);
- spinlock_release(&node->lock);
- return n_bytes;
-}
-
-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 n_blocks = __DIV_ROUNDUP(sio->len, dev->blocksize);
- size_t n_bytes = n_blocks * dev->blocksize;
- size_t cpy_off;
-
- if (dev->blocksize == 0 || sio->len == 0) {
- /* Sizes can't be zero! */
- return -EIO;
- }
-
- spinlock_acquire(&node->lock);
- buf = dynalloc_memalign(n_bytes, 0x1000);
-
- if (buf == NULL) {
- spinlock_release(&node->lock);
- return -ENOMEM;
- }
-
- dev_txn.len = n_blocks;
- dev_txn.buf = buf;
- dev_txn.offset = sio->offset / dev->blocksize;
- dev->read(dev, &dev_txn);
- spinlock_release(&node->lock);
-
- cpy_off = sio->offset - (dev_txn.offset * dev->blocksize);
- for (size_t i = 0; i < sio->len; ++i) {
- ((uint8_t *)sio->buf)[i] = buf[i + cpy_off];
- }
-
- 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);
-
- if (dev->blocksize > 1)
- return blkdev_read(dev, node, sio);
-
- return cdev_read(dev, node, sio);
-}
-
-static int
-vop_open(struct vnode *vp)
-{
- struct device_node *node;
- struct device *dev;
-
- if (vp == NULL) {
- return -EIO;
- }
-
- node = vp->data;
- dev = device_fetch(node->major, node->minor);
-
- if (dev->open == NULL) {
- return -EIO;
- }
-
- return dev->open(dev);
-}
-
-static int
-vop_close(struct vnode *vp)
-{
- struct device_node *node;
- struct device *dev;
-
- if (vp == NULL) {
- return -EIO;
- }
-
- node = vp->data;
- dev = device_fetch(node->major, node->minor);
-
- if (dev->close == NULL) {
- return -EIO;
- }
-
- return dev->close(dev);
-}
-
-static int
-devfs_init(struct fs_info *info, struct vnode *source)
-{
- if (source != NULL)
- return -EINVAL;
-
- 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_dev(const char *name, const struct device *dev)
-{
- struct device_node *node;
- int status;
-
- if ((status = devfs_make_devicenode(name, &node)) != 0) {
- return status;
- }
-
- node->major = dev->major;
- node->minor = dev->minor;
- node->is_block = dev->blocksize > 1;
- TAILQ_INSERT_HEAD(&nodes, node, link);
- return 0;
-}
-
-/*
- * Fetch a device descriptor from a vnode.
- */
-int
-devfs_get_dev(struct vnode *vp, struct device **res)
-{
- struct device_node *n;
- struct device *dev;
-
- /* Is this really a device? */
- if (vp->type != VBLK && vp->type != VCHR) {
- return -ENODEV;
- }
-
- n = vp->data;
- if ((dev = device_fetch(n->major, n->minor)) == NULL) {
- return -ENODEV;
- }
-
- *res = dev;
- return 0;
-}
-
-struct vfsops g_devfs_ops = {
- .init = devfs_init
-};
-
-struct vops g_devfs_vops = {
- .vget = vop_vget,
- .read = vop_read,
- .open = vop_open,
- .close = vop_close
-};
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 06:50:52 +0000