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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
The module pointer in class_create() never actually did anything, and it shouldn't have been requred to be set as a parameter even if it did something. So just remove it and fix up all callers of the function in the kernel tree at the same time. Cc: "Rafael J. Wysocki" <rafael@kernel.org> Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Link: https://lore.kernel.org/r/20230313181843.1207845-4-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
438 lines
10 KiB
C
438 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* An implementation of a loadable kernel mode driver providing
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* multiple kernel/user space bidirectional communications links.
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*
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* Author: Alan Cox <alan@lxorguk.ukuu.org.uk>
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*
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* Adapted to become the Linux 2.0 Coda pseudo device
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* Peter Braam <braam@maths.ox.ac.uk>
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* Michael Callahan <mjc@emmy.smith.edu>
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*
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* Changes for Linux 2.1
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* Copyright (c) 1997 Carnegie-Mellon University
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/time.h>
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#include <linux/sched/signal.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/fcntl.h>
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#include <linux/delay.h>
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#include <linux/skbuff.h>
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#include <linux/proc_fs.h>
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#include <linux/vmalloc.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/poll.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/pid_namespace.h>
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#include <asm/io.h>
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#include <linux/uaccess.h>
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#include <linux/coda.h>
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#include "coda_psdev.h"
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#include "coda_linux.h"
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#include "coda_int.h"
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/* statistics */
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int coda_hard; /* allows signals during upcalls */
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unsigned long coda_timeout = 30; /* .. secs, then signals will dequeue */
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struct venus_comm coda_comms[MAX_CODADEVS];
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static struct class *coda_psdev_class;
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/*
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* Device operations
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*/
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static __poll_t coda_psdev_poll(struct file *file, poll_table * wait)
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{
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struct venus_comm *vcp = (struct venus_comm *) file->private_data;
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__poll_t mask = EPOLLOUT | EPOLLWRNORM;
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poll_wait(file, &vcp->vc_waitq, wait);
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mutex_lock(&vcp->vc_mutex);
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if (!list_empty(&vcp->vc_pending))
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mask |= EPOLLIN | EPOLLRDNORM;
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mutex_unlock(&vcp->vc_mutex);
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return mask;
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}
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static long coda_psdev_ioctl(struct file * filp, unsigned int cmd, unsigned long arg)
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{
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unsigned int data;
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switch(cmd) {
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case CIOC_KERNEL_VERSION:
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data = CODA_KERNEL_VERSION;
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return put_user(data, (int __user *) arg);
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default:
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return -ENOTTY;
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}
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return 0;
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}
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/*
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* Receive a message written by Venus to the psdev
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*/
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static ssize_t coda_psdev_write(struct file *file, const char __user *buf,
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size_t nbytes, loff_t *off)
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{
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struct venus_comm *vcp = (struct venus_comm *) file->private_data;
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struct upc_req *req = NULL;
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struct upc_req *tmp;
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struct list_head *lh;
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struct coda_in_hdr hdr;
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ssize_t retval = 0, count = 0;
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int error;
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/* make sure there is enough to copy out the (opcode, unique) values */
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if (nbytes < (2 * sizeof(u_int32_t)))
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return -EINVAL;
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/* Peek at the opcode, uniquefier */
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if (copy_from_user(&hdr, buf, 2 * sizeof(u_int32_t)))
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return -EFAULT;
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if (DOWNCALL(hdr.opcode)) {
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union outputArgs *dcbuf;
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int size = sizeof(*dcbuf);
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if ( nbytes < sizeof(struct coda_out_hdr) ) {
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pr_warn("coda_downcall opc %d uniq %d, not enough!\n",
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hdr.opcode, hdr.unique);
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count = nbytes;
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goto out;
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}
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if ( nbytes > size ) {
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pr_warn("downcall opc %d, uniq %d, too much!",
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hdr.opcode, hdr.unique);
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nbytes = size;
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}
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dcbuf = vmemdup_user(buf, nbytes);
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if (IS_ERR(dcbuf)) {
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retval = PTR_ERR(dcbuf);
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goto out;
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}
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/* what downcall errors does Venus handle ? */
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error = coda_downcall(vcp, hdr.opcode, dcbuf, nbytes);
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kvfree(dcbuf);
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if (error) {
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pr_warn("%s: coda_downcall error: %d\n",
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__func__, error);
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retval = error;
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goto out;
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}
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count = nbytes;
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goto out;
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}
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/* Look for the message on the processing queue. */
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mutex_lock(&vcp->vc_mutex);
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list_for_each(lh, &vcp->vc_processing) {
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tmp = list_entry(lh, struct upc_req , uc_chain);
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if (tmp->uc_unique == hdr.unique) {
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req = tmp;
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list_del(&req->uc_chain);
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break;
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}
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}
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mutex_unlock(&vcp->vc_mutex);
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if (!req) {
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pr_warn("%s: msg (%d, %d) not found\n",
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__func__, hdr.opcode, hdr.unique);
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retval = -ESRCH;
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goto out;
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}
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/* move data into response buffer. */
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if (req->uc_outSize < nbytes) {
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pr_warn("%s: too much cnt: %d, cnt: %ld, opc: %d, uniq: %d.\n",
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__func__, req->uc_outSize, (long)nbytes,
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hdr.opcode, hdr.unique);
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nbytes = req->uc_outSize; /* don't have more space! */
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}
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if (copy_from_user(req->uc_data, buf, nbytes)) {
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req->uc_flags |= CODA_REQ_ABORT;
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wake_up(&req->uc_sleep);
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retval = -EFAULT;
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goto out;
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}
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/* adjust outsize. is this useful ?? */
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req->uc_outSize = nbytes;
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req->uc_flags |= CODA_REQ_WRITE;
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count = nbytes;
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/* Convert filedescriptor into a file handle */
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if (req->uc_opcode == CODA_OPEN_BY_FD) {
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struct coda_open_by_fd_out *outp =
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(struct coda_open_by_fd_out *)req->uc_data;
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if (!outp->oh.result) {
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outp->fh = fget(outp->fd);
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if (!outp->fh)
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return -EBADF;
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}
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}
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wake_up(&req->uc_sleep);
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out:
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return(count ? count : retval);
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}
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/*
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* Read a message from the kernel to Venus
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*/
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static ssize_t coda_psdev_read(struct file * file, char __user * buf,
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size_t nbytes, loff_t *off)
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{
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DECLARE_WAITQUEUE(wait, current);
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struct venus_comm *vcp = (struct venus_comm *) file->private_data;
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struct upc_req *req;
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ssize_t retval = 0, count = 0;
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if (nbytes == 0)
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return 0;
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mutex_lock(&vcp->vc_mutex);
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add_wait_queue(&vcp->vc_waitq, &wait);
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set_current_state(TASK_INTERRUPTIBLE);
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while (list_empty(&vcp->vc_pending)) {
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if (file->f_flags & O_NONBLOCK) {
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retval = -EAGAIN;
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break;
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}
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if (signal_pending(current)) {
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retval = -ERESTARTSYS;
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break;
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}
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mutex_unlock(&vcp->vc_mutex);
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schedule();
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mutex_lock(&vcp->vc_mutex);
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}
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set_current_state(TASK_RUNNING);
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remove_wait_queue(&vcp->vc_waitq, &wait);
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if (retval)
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goto out;
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req = list_entry(vcp->vc_pending.next, struct upc_req,uc_chain);
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list_del(&req->uc_chain);
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/* Move the input args into userspace */
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count = req->uc_inSize;
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if (nbytes < req->uc_inSize) {
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pr_warn("%s: Venus read %ld bytes of %d in message\n",
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__func__, (long)nbytes, req->uc_inSize);
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count = nbytes;
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}
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if (copy_to_user(buf, req->uc_data, count))
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retval = -EFAULT;
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/* If request was not a signal, enqueue and don't free */
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if (!(req->uc_flags & CODA_REQ_ASYNC)) {
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req->uc_flags |= CODA_REQ_READ;
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list_add_tail(&(req->uc_chain), &vcp->vc_processing);
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goto out;
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}
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kvfree(req->uc_data);
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kfree(req);
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out:
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mutex_unlock(&vcp->vc_mutex);
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return (count ? count : retval);
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}
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static int coda_psdev_open(struct inode * inode, struct file * file)
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{
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struct venus_comm *vcp;
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int idx, err;
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if (task_active_pid_ns(current) != &init_pid_ns)
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return -EINVAL;
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if (current_user_ns() != &init_user_ns)
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return -EINVAL;
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idx = iminor(inode);
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if (idx < 0 || idx >= MAX_CODADEVS)
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return -ENODEV;
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err = -EBUSY;
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vcp = &coda_comms[idx];
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mutex_lock(&vcp->vc_mutex);
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if (!vcp->vc_inuse) {
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vcp->vc_inuse++;
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INIT_LIST_HEAD(&vcp->vc_pending);
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INIT_LIST_HEAD(&vcp->vc_processing);
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init_waitqueue_head(&vcp->vc_waitq);
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vcp->vc_sb = NULL;
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vcp->vc_seq = 0;
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file->private_data = vcp;
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err = 0;
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}
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mutex_unlock(&vcp->vc_mutex);
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return err;
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}
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static int coda_psdev_release(struct inode * inode, struct file * file)
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{
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struct venus_comm *vcp = (struct venus_comm *) file->private_data;
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struct upc_req *req, *tmp;
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if (!vcp || !vcp->vc_inuse ) {
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pr_warn("%s: Not open.\n", __func__);
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return -1;
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}
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mutex_lock(&vcp->vc_mutex);
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/* Wakeup clients so they can return. */
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list_for_each_entry_safe(req, tmp, &vcp->vc_pending, uc_chain) {
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list_del(&req->uc_chain);
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/* Async requests need to be freed here */
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if (req->uc_flags & CODA_REQ_ASYNC) {
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kvfree(req->uc_data);
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kfree(req);
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continue;
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}
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req->uc_flags |= CODA_REQ_ABORT;
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wake_up(&req->uc_sleep);
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}
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list_for_each_entry_safe(req, tmp, &vcp->vc_processing, uc_chain) {
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list_del(&req->uc_chain);
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req->uc_flags |= CODA_REQ_ABORT;
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wake_up(&req->uc_sleep);
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}
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file->private_data = NULL;
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vcp->vc_inuse--;
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mutex_unlock(&vcp->vc_mutex);
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return 0;
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}
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static const struct file_operations coda_psdev_fops = {
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.owner = THIS_MODULE,
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.read = coda_psdev_read,
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.write = coda_psdev_write,
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.poll = coda_psdev_poll,
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.unlocked_ioctl = coda_psdev_ioctl,
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.open = coda_psdev_open,
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.release = coda_psdev_release,
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.llseek = noop_llseek,
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};
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static int __init init_coda_psdev(void)
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{
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int i, err = 0;
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if (register_chrdev(CODA_PSDEV_MAJOR, "coda", &coda_psdev_fops)) {
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pr_err("%s: unable to get major %d\n",
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__func__, CODA_PSDEV_MAJOR);
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return -EIO;
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}
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coda_psdev_class = class_create("coda");
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if (IS_ERR(coda_psdev_class)) {
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err = PTR_ERR(coda_psdev_class);
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goto out_chrdev;
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}
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for (i = 0; i < MAX_CODADEVS; i++) {
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mutex_init(&(&coda_comms[i])->vc_mutex);
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device_create(coda_psdev_class, NULL,
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MKDEV(CODA_PSDEV_MAJOR, i), NULL, "cfs%d", i);
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}
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coda_sysctl_init();
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goto out;
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out_chrdev:
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unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
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out:
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return err;
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}
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MODULE_AUTHOR("Jan Harkes, Peter J. Braam");
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MODULE_DESCRIPTION("Coda Distributed File System VFS interface");
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MODULE_ALIAS_CHARDEV_MAJOR(CODA_PSDEV_MAJOR);
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MODULE_LICENSE("GPL");
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MODULE_VERSION("7.2");
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static int __init init_coda(void)
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{
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int status;
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int i;
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status = coda_init_inodecache();
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if (status)
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goto out2;
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status = init_coda_psdev();
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if ( status ) {
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pr_warn("Problem (%d) in init_coda_psdev\n", status);
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goto out1;
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}
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status = register_filesystem(&coda_fs_type);
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if (status) {
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pr_warn("failed to register filesystem!\n");
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goto out;
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}
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return 0;
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out:
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for (i = 0; i < MAX_CODADEVS; i++)
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device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
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class_destroy(coda_psdev_class);
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unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
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coda_sysctl_clean();
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out1:
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coda_destroy_inodecache();
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out2:
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return status;
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}
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static void __exit exit_coda(void)
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{
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int err, i;
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err = unregister_filesystem(&coda_fs_type);
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if (err != 0)
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pr_warn("failed to unregister filesystem\n");
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for (i = 0; i < MAX_CODADEVS; i++)
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device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
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class_destroy(coda_psdev_class);
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unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
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coda_sysctl_clean();
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coda_destroy_inodecache();
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}
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module_init(init_coda);
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module_exit(exit_coda);
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