[mirror_ubuntu-jammy-kernel.git] / fs / coda / psdev.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *      	An implementation of a loadable kernel mode driver providing
 *		multiple kernel/user space bidirectional communications links.
 *
 * 		Author: 	Alan Cox <alan@lxorguk.ukuu.org.uk>
 * 
 *              Adapted to become the Linux 2.0 Coda pseudo device
 *              Peter  Braam  <braam@maths.ox.ac.uk> 
 *              Michael Callahan <mjc@emmy.smith.edu>           
 *
 *              Changes for Linux 2.1
 *              Copyright (c) 1997 Carnegie-Mellon University
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/time.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/pid_namespace.h>
#include <asm/io.h>
#include <linux/uaccess.h>

#include <linux/coda.h>
#include <linux/coda_psdev.h>

#include "coda_linux.h"

#include "coda_int.h"

/* statistics */
int           coda_hard;         /* allows signals during upcalls */
unsigned long coda_timeout = 30; /* .. secs, then signals will dequeue */


struct venus_comm coda_comms[MAX_CODADEVS];
static struct class *coda_psdev_class;

/*
 * Device operations
 */

static __poll_t coda_psdev_poll(struct file *file, poll_table * wait)
{
        struct venus_comm *vcp = (struct venus_comm *) file->private_data;
	__poll_t mask = EPOLLOUT | EPOLLWRNORM;

	poll_wait(file, &vcp->vc_waitq, wait);
	mutex_lock(&vcp->vc_mutex);
	if (!list_empty(&vcp->vc_pending))
                mask |= EPOLLIN | EPOLLRDNORM;
	mutex_unlock(&vcp->vc_mutex);

	return mask;
}

static long coda_psdev_ioctl(struct file * filp, unsigned int cmd, unsigned long arg)
{
	unsigned int data;

	switch(cmd) {
	case CIOC_KERNEL_VERSION:
		data = CODA_KERNEL_VERSION;
		return put_user(data, (int __user *) arg);
	default:
		return -ENOTTY;
	}

	return 0;
}

/*
 *	Receive a message written by Venus to the psdev
 */
 
static ssize_t coda_psdev_write(struct file *file, const char __user *buf, 
				size_t nbytes, loff_t *off)
{
        struct venus_comm *vcp = (struct venus_comm *) file->private_data;
        struct upc_req *req = NULL;
        struct upc_req *tmp;
	struct list_head *lh;
	struct coda_in_hdr hdr;
	ssize_t retval = 0, count = 0;
	int error;

	/* make sure there is enough to copy out the (opcode, unique) values */
	if (nbytes < (2 * sizeof(u_int32_t)))
		return -EINVAL;

        /* Peek at the opcode, uniquefier */
	if (copy_from_user(&hdr, buf, 2 * sizeof(u_int32_t)))
	        return -EFAULT;

        if (DOWNCALL(hdr.opcode)) {
		union outputArgs *dcbuf;
		int size = sizeof(*dcbuf);

		if  ( nbytes < sizeof(struct coda_out_hdr) ) {
			pr_warn("coda_downcall opc %d uniq %d, not enough!\n",
				hdr.opcode, hdr.unique);
			count = nbytes;
			goto out;
		}
		if ( nbytes > size ) {
			pr_warn("downcall opc %d, uniq %d, too much!",
				hdr.opcode, hdr.unique);
		        nbytes = size;
		}
		CODA_ALLOC(dcbuf, union outputArgs *, nbytes);
		if (copy_from_user(dcbuf, buf, nbytes)) {
			CODA_FREE(dcbuf, nbytes);
			retval = -EFAULT;
			goto out;
		}

		/* what downcall errors does Venus handle ? */
		error = coda_downcall(vcp, hdr.opcode, dcbuf, nbytes);

		CODA_FREE(dcbuf, nbytes);
		if (error) {
			pr_warn("%s: coda_downcall error: %d\n",
				__func__, error);
			retval = error;
			goto out;
		}
		count = nbytes;
		goto out;
	}
        
	/* Look for the message on the processing queue. */
	mutex_lock(&vcp->vc_mutex);
	list_for_each(lh, &vcp->vc_processing) {
		tmp = list_entry(lh, struct upc_req , uc_chain);
		if (tmp->uc_unique == hdr.unique) {
			req = tmp;
			list_del(&req->uc_chain);
			break;
		}
	}
	mutex_unlock(&vcp->vc_mutex);

	if (!req) {
		pr_warn("%s: msg (%d, %d) not found\n",
			__func__, hdr.opcode, hdr.unique);
		retval = -ESRCH;
		goto out;
	}

        /* move data into response buffer. */
	if (req->uc_outSize < nbytes) {
		pr_warn("%s: too much cnt: %d, cnt: %ld, opc: %d, uniq: %d.\n",
			__func__, req->uc_outSize, (long)nbytes,
			hdr.opcode, hdr.unique);
		nbytes = req->uc_outSize; /* don't have more space! */
	}
        if (copy_from_user(req->uc_data, buf, nbytes)) {
		req->uc_flags |= CODA_REQ_ABORT;
		wake_up(&req->uc_sleep);
		retval = -EFAULT;
		goto out;
	}

	/* adjust outsize. is this useful ?? */
	req->uc_outSize = nbytes;
	req->uc_flags |= CODA_REQ_WRITE;
	count = nbytes;

	/* Convert filedescriptor into a file handle */
	if (req->uc_opcode == CODA_OPEN_BY_FD) {
		struct coda_open_by_fd_out *outp =
			(struct coda_open_by_fd_out *)req->uc_data;
		if (!outp->oh.result) {
			outp->fh = fget(outp->fd);
			if (!outp->fh)
				return -EBADF;
		}
	}

        wake_up(&req->uc_sleep);
out:
        return(count ? count : retval);  
}

/*
 *	Read a message from the kernel to Venus
 */

static ssize_t coda_psdev_read(struct file * file, char __user * buf, 
			       size_t nbytes, loff_t *off)
{
	DECLARE_WAITQUEUE(wait, current);
        struct venus_comm *vcp = (struct venus_comm *) file->private_data;
        struct upc_req *req;
	ssize_t retval = 0, count = 0;

	if (nbytes == 0)
		return 0;

	mutex_lock(&vcp->vc_mutex);

	add_wait_queue(&vcp->vc_waitq, &wait);
	set_current_state(TASK_INTERRUPTIBLE);

	while (list_empty(&vcp->vc_pending)) {
		if (file->f_flags & O_NONBLOCK) {
			retval = -EAGAIN;
			break;
		}
		if (signal_pending(current)) {
			retval = -ERESTARTSYS;
			break;
		}
		mutex_unlock(&vcp->vc_mutex);
		schedule();
		mutex_lock(&vcp->vc_mutex);
	}

	set_current_state(TASK_RUNNING);
	remove_wait_queue(&vcp->vc_waitq, &wait);

	if (retval)
		goto out;

	req = list_entry(vcp->vc_pending.next, struct upc_req,uc_chain);
	list_del(&req->uc_chain);

	/* Move the input args into userspace */
	count = req->uc_inSize;
	if (nbytes < req->uc_inSize) {
		pr_warn("%s: Venus read %ld bytes of %d in message\n",
			__func__, (long)nbytes, req->uc_inSize);
		count = nbytes;
        }

	if (copy_to_user(buf, req->uc_data, count))
	        retval = -EFAULT;
        
	/* If request was not a signal, enqueue and don't free */
	if (!(req->uc_flags & CODA_REQ_ASYNC)) {
		req->uc_flags |= CODA_REQ_READ;
		list_add_tail(&(req->uc_chain), &vcp->vc_processing);
		goto out;
	}

	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
	kfree(req);
out:
	mutex_unlock(&vcp->vc_mutex);
	return (count ? count : retval);
}

static int coda_psdev_open(struct inode * inode, struct file * file)
{
	struct venus_comm *vcp;
	int idx, err;

	if (task_active_pid_ns(current) != &init_pid_ns)
		return -EINVAL;

	if (current_user_ns() != &init_user_ns)
		return -EINVAL;

	idx = iminor(inode);
	if (idx < 0 || idx >= MAX_CODADEVS)
		return -ENODEV;

	err = -EBUSY;
	vcp = &coda_comms[idx];
	mutex_lock(&vcp->vc_mutex);

	if (!vcp->vc_inuse) {
		vcp->vc_inuse++;

		INIT_LIST_HEAD(&vcp->vc_pending);
		INIT_LIST_HEAD(&vcp->vc_processing);
		init_waitqueue_head(&vcp->vc_waitq);
		vcp->vc_sb = NULL;
		vcp->vc_seq = 0;

		file->private_data = vcp;
		err = 0;
	}

	mutex_unlock(&vcp->vc_mutex);
	return err;
}


static int coda_psdev_release(struct inode * inode, struct file * file)
{
	struct venus_comm *vcp = (struct venus_comm *) file->private_data;
	struct upc_req *req, *tmp;

	if (!vcp || !vcp->vc_inuse ) {
		pr_warn("%s: Not open.\n", __func__);
		return -1;
	}

	mutex_lock(&vcp->vc_mutex);

	/* Wakeup clients so they can return. */
	list_for_each_entry_safe(req, tmp, &vcp->vc_pending, uc_chain) {
		list_del(&req->uc_chain);

		/* Async requests need to be freed here */
		if (req->uc_flags & CODA_REQ_ASYNC) {
			CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
			kfree(req);
			continue;
		}
		req->uc_flags |= CODA_REQ_ABORT;
		wake_up(&req->uc_sleep);
	}

	list_for_each_entry_safe(req, tmp, &vcp->vc_processing, uc_chain) {
		list_del(&req->uc_chain);

		req->uc_flags |= CODA_REQ_ABORT;
		wake_up(&req->uc_sleep);
	}

	file->private_data = NULL;
	vcp->vc_inuse--;
	mutex_unlock(&vcp->vc_mutex);
	return 0;
}


static const struct file_operations coda_psdev_fops = {
	.owner		= THIS_MODULE,
	.read		= coda_psdev_read,
	.write		= coda_psdev_write,
	.poll		= coda_psdev_poll,
	.unlocked_ioctl	= coda_psdev_ioctl,
	.open		= coda_psdev_open,
	.release	= coda_psdev_release,
	.llseek		= noop_llseek,
};

static int init_coda_psdev(void)
{
	int i, err = 0;
	if (register_chrdev(CODA_PSDEV_MAJOR, "coda", &coda_psdev_fops)) {
		pr_err("%s: unable to get major %d\n",
		       __func__, CODA_PSDEV_MAJOR);
		return -EIO;
	}
	coda_psdev_class = class_create(THIS_MODULE, "coda");
	if (IS_ERR(coda_psdev_class)) {
		err = PTR_ERR(coda_psdev_class);
		goto out_chrdev;
	}		
	for (i = 0; i < MAX_CODADEVS; i++) {
		mutex_init(&(&coda_comms[i])->vc_mutex);
		device_create(coda_psdev_class, NULL,
			      MKDEV(CODA_PSDEV_MAJOR, i), NULL, "cfs%d", i);
	}
	coda_sysctl_init();
	goto out;

out_chrdev:
	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
out:
	return err;
}

MODULE_AUTHOR("Jan Harkes, Peter J. Braam");
MODULE_DESCRIPTION("Coda Distributed File System VFS interface");
MODULE_ALIAS_CHARDEV_MAJOR(CODA_PSDEV_MAJOR);
MODULE_LICENSE("GPL");
MODULE_VERSION("6.6");

static int __init init_coda(void)
{
	int status;
	int i;

	status = coda_init_inodecache();
	if (status)
		goto out2;
	status = init_coda_psdev();
	if ( status ) {
		pr_warn("Problem (%d) in init_coda_psdev\n", status);
		goto out1;
	}
	
	status = register_filesystem(&coda_fs_type);
	if (status) {
		pr_warn("failed to register filesystem!\n");
		goto out;
	}
	return 0;
out:
	for (i = 0; i < MAX_CODADEVS; i++)
		device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
	class_destroy(coda_psdev_class);
	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	coda_sysctl_clean();
out1:
	coda_destroy_inodecache();
out2:
	return status;
}

static void __exit exit_coda(void)
{
        int err, i;

	err = unregister_filesystem(&coda_fs_type);
	if (err != 0)
		pr_warn("failed to unregister filesystem\n");
	for (i = 0; i < MAX_CODADEVS; i++)
		device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
	class_destroy(coda_psdev_class);
	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	coda_sysctl_clean();
	coda_destroy_inodecache();
}

module_init(init_coda);
module_exit(exit_coda);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* An implementation of a loadable kernel mode driver providing
	4	* multiple kernel/user space bidirectional communications links.
	5	*
526719ba	6	* Author: Alan Cox <alan@lxorguk.ukuu.org.uk>
1da177e4 LT	7	*
	8	* Adapted to become the Linux 2.0 Coda pseudo device
	9	* Peter Braam <braam@maths.ox.ac.uk>
	10	* Michael Callahan <mjc@emmy.smith.edu>
	11	*
	12	* Changes for Linux 2.1
	13	* Copyright (c) 1997 Carnegie-Mellon University
	14	*/
	15
	16	#include <linux/module.h>
	17	#include <linux/errno.h>
	18	#include <linux/kernel.h>
	19	#include <linux/major.h>
	20	#include <linux/time.h>
174cd4b1	21	#include <linux/sched/signal.h>
1da177e4 LT	22	#include <linux/slab.h>
	23	#include <linux/ioport.h>
	24	#include <linux/fcntl.h>
	25	#include <linux/delay.h>
	26	#include <linux/skbuff.h>
	27	#include <linux/proc_fs.h>
1da177e4 LT	28	#include <linux/vmalloc.h>
	29	#include <linux/fs.h>
	30	#include <linux/file.h>
	31	#include <linux/poll.h>
	32	#include <linux/init.h>
	33	#include <linux/list.h>
da47c19e	34	#include <linux/mutex.h>
1da177e4	35	#include <linux/device.h>
9fd973e0	36	#include <linux/pid_namespace.h>
1da177e4	37	#include <asm/io.h>
834b46c3	38	#include <linux/uaccess.h>
1da177e4 LT	39
1da177e4 LT	40	#include <linux/coda.h>
1da177e4	41	#include <linux/coda_psdev.h>
1da177e4	42
31a203df AV	43	#include "coda_linux.h"
31a203df AV	44
c98d8cfb	45	#include "coda_int.h"
1da177e4	46
1da177e4 LT	47	/* statistics */
	48	int coda_hard; /* allows signals during upcalls */
	49	unsigned long coda_timeout = 30; /* .. secs, then signals will dequeue */
	50
	51
	52	struct venus_comm coda_comms[MAX_CODADEVS];
1db560af	53	static struct class *coda_psdev_class;
1da177e4 LT	54
	55	/*
	56	* Device operations
	57	*/
	58
076ccb76	59	static __poll_t coda_psdev_poll(struct file file, poll_table wait)
1da177e4 LT	60	{
1da177e4 LT	61	struct venus_comm vcp = (struct venus_comm ) file->private_data;
a9a08845	62	__poll_t mask = EPOLLOUT \| EPOLLWRNORM;
1da177e4 LT	63
1da177e4 LT	64	poll_wait(file, &vcp->vc_waitq, wait);
da47c19e	65	mutex_lock(&vcp->vc_mutex);
1da177e4	66	if (!list_empty(&vcp->vc_pending))
a9a08845	67	mask \|= EPOLLIN \| EPOLLRDNORM;
da47c19e	68	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	69
	70	return mask;
	71	}
	72
97718390	73	static long coda_psdev_ioctl(struct file * filp, unsigned int cmd, unsigned long arg)
1da177e4 LT	74	{
	75	unsigned int data;
	76
	77	switch(cmd) {
	78	case CIOC_KERNEL_VERSION:
	79	data = CODA_KERNEL_VERSION;
	80	return put_user(data, (int __user *) arg);
	81	default:
	82	return -ENOTTY;
	83	}
	84
	85	return 0;
	86	}
	87
	88	/*
	89	* Receive a message written by Venus to the psdev
	90	*/
	91
	92	static ssize_t coda_psdev_write(struct file file, const char __user buf,
	93	size_t nbytes, loff_t *off)
	94	{
	95	struct venus_comm vcp = (struct venus_comm ) file->private_data;
	96	struct upc_req *req = NULL;
	97	struct upc_req *tmp;
	98	struct list_head *lh;
	99	struct coda_in_hdr hdr;
	100	ssize_t retval = 0, count = 0;
	101	int error;
	102
6e51f8aa JH	103	/* make sure there is enough to copy out the (opcode, unique) values */
	104	if (nbytes < (2 * sizeof(u_int32_t)))
	105	return -EINVAL;
	106
1da177e4	107	/* Peek at the opcode, uniquefier */
6e51f8aa	108	if (copy_from_user(&hdr, buf, 2 * sizeof(u_int32_t)))
1da177e4 LT	109	return -EFAULT;
	110
	111	if (DOWNCALL(hdr.opcode)) {
f7cc02b8	112	union outputArgs *dcbuf;
1da177e4 LT	113	int size = sizeof(*dcbuf);
1da177e4 LT	114
1da177e4	115	if ( nbytes < sizeof(struct coda_out_hdr) ) {
d9b4b319 FF	116	pr_warn("coda_downcall opc %d uniq %d, not enough!\n",
d9b4b319 FF	117	hdr.opcode, hdr.unique);
1da177e4 LT	118	count = nbytes;
	119	goto out;
	120	}
	121	if ( nbytes > size ) {
f38cfb25	122	pr_warn("downcall opc %d, uniq %d, too much!",
d9b4b319	123	hdr.opcode, hdr.unique);
1da177e4 LT	124	nbytes = size;
	125	}
	126	CODA_ALLOC(dcbuf, union outputArgs *, nbytes);
	127	if (copy_from_user(dcbuf, buf, nbytes)) {
	128	CODA_FREE(dcbuf, nbytes);
	129	retval = -EFAULT;
	130	goto out;
	131	}
	132
	133	/* what downcall errors does Venus handle ? */
6e51f8aa	134	error = coda_downcall(vcp, hdr.opcode, dcbuf, nbytes);
1da177e4 LT	135
	136	CODA_FREE(dcbuf, nbytes);
	137	if (error) {
6d6bd94f FF	138	pr_warn("%s: coda_downcall error: %d\n",
6d6bd94f FF	139	__func__, error);
1da177e4 LT	140	retval = error;
	141	goto out;
	142	}
	143	count = nbytes;
	144	goto out;
	145	}
	146
	147	/* Look for the message on the processing queue. */
da47c19e	148	mutex_lock(&vcp->vc_mutex);
1da177e4 LT	149	list_for_each(lh, &vcp->vc_processing) {
	150	tmp = list_entry(lh, struct upc_req , uc_chain);
	151	if (tmp->uc_unique == hdr.unique) {
	152	req = tmp;
	153	list_del(&req->uc_chain);
	154	break;
	155	}
	156	}
da47c19e	157	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	158
1da177e4 LT	159	if (!req) {
6d6bd94f FF	160	pr_warn("%s: msg (%d, %d) not found\n",
6d6bd94f FF	161	__func__, hdr.opcode, hdr.unique);
1da177e4 LT	162	retval = -ESRCH;
	163	goto out;
	164	}
	165
	166	/* move data into response buffer. */
	167	if (req->uc_outSize < nbytes) {
6d6bd94f FF	168	pr_warn("%s: too much cnt: %d, cnt: %ld, opc: %d, uniq: %d.\n",
	169	__func__, req->uc_outSize, (long)nbytes,
	170	hdr.opcode, hdr.unique);
1da177e4 LT	171	nbytes = req->uc_outSize; /* don't have more space! */
	172	}
	173	if (copy_from_user(req->uc_data, buf, nbytes)) {
4aeefdc6	174	req->uc_flags \|= CODA_REQ_ABORT;
1da177e4 LT	175	wake_up(&req->uc_sleep);
	176	retval = -EFAULT;
	177	goto out;
	178	}
	179
	180	/* adjust outsize. is this useful ?? */
112d421d JH	181	req->uc_outSize = nbytes;
112d421d JH	182	req->uc_flags \|= CODA_REQ_WRITE;
1da177e4 LT	183	count = nbytes;
	184
	185	/* Convert filedescriptor into a file handle */
	186	if (req->uc_opcode == CODA_OPEN_BY_FD) {
	187	struct coda_open_by_fd_out *outp =
	188	(struct coda_open_by_fd_out *)req->uc_data;
02551c23	189	if (!outp->oh.result) {
38c2e437	190	outp->fh = fget(outp->fd);
02551c23 ZJ	191	if (!outp->fh)
	192	return -EBADF;
	193	}
1da177e4 LT	194	}
	195
	196	wake_up(&req->uc_sleep);
	197	out:
	198	return(count ? count : retval);
	199	}
	200
	201	/*
	202	* Read a message from the kernel to Venus
	203	*/
	204
	205	static ssize_t coda_psdev_read(struct file * file, char __user * buf,
	206	size_t nbytes, loff_t *off)
	207	{
	208	DECLARE_WAITQUEUE(wait, current);
	209	struct venus_comm vcp = (struct venus_comm ) file->private_data;
	210	struct upc_req *req;
	211	ssize_t retval = 0, count = 0;
	212
	213	if (nbytes == 0)
	214	return 0;
	215
da47c19e	216	mutex_lock(&vcp->vc_mutex);
1da177e4 LT	217
	218	add_wait_queue(&vcp->vc_waitq, &wait);
	219	set_current_state(TASK_INTERRUPTIBLE);
	220
	221	while (list_empty(&vcp->vc_pending)) {
	222	if (file->f_flags & O_NONBLOCK) {
	223	retval = -EAGAIN;
	224	break;
	225	}
	226	if (signal_pending(current)) {
	227	retval = -ERESTARTSYS;
	228	break;
	229	}
da47c19e	230	mutex_unlock(&vcp->vc_mutex);
1da177e4	231	schedule();
da47c19e	232	mutex_lock(&vcp->vc_mutex);
1da177e4 LT	233	}
	234
	235	set_current_state(TASK_RUNNING);
	236	remove_wait_queue(&vcp->vc_waitq, &wait);
	237
	238	if (retval)
	239	goto out;
	240
	241	req = list_entry(vcp->vc_pending.next, struct upc_req,uc_chain);
	242	list_del(&req->uc_chain);
	243
	244	/* Move the input args into userspace */
	245	count = req->uc_inSize;
	246	if (nbytes < req->uc_inSize) {
6d6bd94f FF	247	pr_warn("%s: Venus read %ld bytes of %d in message\n",
6d6bd94f FF	248	__func__, (long)nbytes, req->uc_inSize);
1da177e4 LT	249	count = nbytes;
	250	}
	251
	252	if (copy_to_user(buf, req->uc_data, count))
	253	retval = -EFAULT;
	254
	255	/* If request was not a signal, enqueue and don't free */
4aeefdc6 JA	256	if (!(req->uc_flags & CODA_REQ_ASYNC)) {
4aeefdc6 JA	257	req->uc_flags \|= CODA_REQ_READ;
8e13059a	258	list_add_tail(&(req->uc_chain), &vcp->vc_processing);
1da177e4 LT	259	goto out;
	260	}
	261
	262	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
37461e19	263	kfree(req);
1da177e4	264	out:
da47c19e	265	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	266	return (count ? count : retval);
	267	}
	268
	269	static int coda_psdev_open(struct inode * inode, struct file * file)
	270	{
87065519 JH	271	struct venus_comm *vcp;
87065519 JH	272	int idx, err;
1da177e4	273
9fd973e0 EB	274	if (task_active_pid_ns(current) != &init_pid_ns)
	275	return -EINVAL;
	276
d83f5901 EB	277	if (current_user_ns() != &init_user_ns)
	278	return -EINVAL;
	279
1da177e4	280	idx = iminor(inode);
87065519	281	if (idx < 0 \|\| idx >= MAX_CODADEVS)
1da177e4	282	return -ENODEV;
1da177e4	283
87065519	284	err = -EBUSY;
1da177e4	285	vcp = &coda_comms[idx];
da47c19e YA	286	mutex_lock(&vcp->vc_mutex);
da47c19e YA	287
87065519 JH	288	if (!vcp->vc_inuse) {
	289	vcp->vc_inuse++;
	290
1da177e4 LT	291	INIT_LIST_HEAD(&vcp->vc_pending);
	292	INIT_LIST_HEAD(&vcp->vc_processing);
	293	init_waitqueue_head(&vcp->vc_waitq);
	294	vcp->vc_sb = NULL;
	295	vcp->vc_seq = 0;
87065519 JH	296
	297	file->private_data = vcp;
	298	err = 0;
1da177e4	299	}
1da177e4	300
da47c19e	301	mutex_unlock(&vcp->vc_mutex);
87065519	302	return err;
1da177e4 LT	303	}
	304
	305
	306	static int coda_psdev_release(struct inode * inode, struct file * file)
	307	{
87065519 JH	308	struct venus_comm vcp = (struct venus_comm ) file->private_data;
87065519 JH	309	struct upc_req req, tmp;
1da177e4	310
87065519	311	if (!vcp \|\| !vcp->vc_inuse ) {
6d6bd94f	312	pr_warn("%s: Not open.\n", __func__);
1da177e4 LT	313	return -1;
	314	}
	315
da47c19e	316	mutex_lock(&vcp->vc_mutex);
87065519 JH	317
87065519 JH	318	/* Wakeup clients so they can return. */
1da177e4	319	list_for_each_entry_safe(req, tmp, &vcp->vc_pending, uc_chain) {
87065519 JH	320	list_del(&req->uc_chain);
87065519 JH	321
1da177e4	322	/* Async requests need to be freed here */
4aeefdc6	323	if (req->uc_flags & CODA_REQ_ASYNC) {
1da177e4	324	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
37461e19	325	kfree(req);
1da177e4 LT	326	continue;
1da177e4 LT	327	}
4aeefdc6	328	req->uc_flags \|= CODA_REQ_ABORT;
1da177e4	329	wake_up(&req->uc_sleep);
87065519 JH	330	}
	331
	332	list_for_each_entry_safe(req, tmp, &vcp->vc_processing, uc_chain) {
	333	list_del(&req->uc_chain);
	334
4aeefdc6	335	req->uc_flags \|= CODA_REQ_ABORT;
87065519 JH	336	wake_up(&req->uc_sleep);
87065519 JH	337	}
1da177e4	338
87065519 JH	339	file->private_data = NULL;
87065519 JH	340	vcp->vc_inuse--;
da47c19e	341	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	342	return 0;
	343	}
	344
	345
4b6f5d20	346	static const struct file_operations coda_psdev_fops = {
1da177e4 LT	347	.owner = THIS_MODULE,
	348	.read = coda_psdev_read,
	349	.write = coda_psdev_write,
	350	.poll = coda_psdev_poll,
97718390	351	.unlocked_ioctl = coda_psdev_ioctl,
1da177e4 LT	352	.open = coda_psdev_open,
1da177e4 LT	353	.release = coda_psdev_release,
6038f373	354	.llseek = noop_llseek,
1da177e4 LT	355	};
	356
	357	static int init_coda_psdev(void)
	358	{
	359	int i, err = 0;
	360	if (register_chrdev(CODA_PSDEV_MAJOR, "coda", &coda_psdev_fops)) {
6d6bd94f FF	361	pr_err("%s: unable to get major %d\n",
6d6bd94f FF	362	__func__, CODA_PSDEV_MAJOR);
85062213	363	return -EIO;
1da177e4	364	}
1db560af	365	coda_psdev_class = class_create(THIS_MODULE, "coda");
1da177e4 LT	366	if (IS_ERR(coda_psdev_class)) {
	367	err = PTR_ERR(coda_psdev_class);
	368	goto out_chrdev;
	369	}
da47c19e YA	370	for (i = 0; i < MAX_CODADEVS; i++) {
da47c19e YA	371	mutex_init(&(&coda_comms[i])->vc_mutex);
a9b12619 GKH	372	device_create(coda_psdev_class, NULL,
a9b12619 GKH	373	MKDEV(CODA_PSDEV_MAJOR, i), NULL, "cfs%d", i);
da47c19e	374	}
1da177e4 LT	375	coda_sysctl_init();
	376	goto out;
	377
1da177e4 LT	378	out_chrdev:
	379	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	380	out:
	381	return err;
	382	}
	383
5b7f13bd JH	384	MODULE_AUTHOR("Jan Harkes, Peter J. Braam");
	385	MODULE_DESCRIPTION("Coda Distributed File System VFS interface");
	386	MODULE_ALIAS_CHARDEV_MAJOR(CODA_PSDEV_MAJOR);
1da177e4	387	MODULE_LICENSE("GPL");
5b7f13bd	388	MODULE_VERSION("6.6");
1da177e4	389
1da177e4 LT	390	static int __init init_coda(void)
	391	{
	392	int status;
	393	int i;
1da177e4 LT	394
	395	status = coda_init_inodecache();
	396	if (status)
	397	goto out2;
	398	status = init_coda_psdev();
	399	if ( status ) {
d9b4b319	400	pr_warn("Problem (%d) in init_coda_psdev\n", status);
1da177e4 LT	401	goto out1;
	402	}
	403
	404	status = register_filesystem(&coda_fs_type);
	405	if (status) {
f38cfb25	406	pr_warn("failed to register filesystem!\n");
1da177e4 LT	407	goto out;
	408	}
	409	return 0;
	410	out:
8ab5e4c1	411	for (i = 0; i < MAX_CODADEVS; i++)
62ca8792	412	device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
1db560af	413	class_destroy(coda_psdev_class);
1da177e4 LT	414	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	415	coda_sysctl_clean();
	416	out1:
	417	coda_destroy_inodecache();
	418	out2:
	419	return status;
	420	}
	421
	422	static void __exit exit_coda(void)
	423	{
	424	int err, i;
	425
	426	err = unregister_filesystem(&coda_fs_type);
d9b4b319	427	if (err != 0)
f38cfb25	428	pr_warn("failed to unregister filesystem\n");
8ab5e4c1	429	for (i = 0; i < MAX_CODADEVS; i++)
62ca8792	430	device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
1db560af	431	class_destroy(coda_psdev_class);
1da177e4 LT	432	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	433	coda_sysctl_clean();
	434	coda_destroy_inodecache();
	435	}
	436
	437	module_init(init_coda);
	438	module_exit(exit_coda);
	439