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

/*
 *      	An implementation of a loadable kernel mode driver providing
 *		multiple kernel/user space bidirectional communications links.
 *
 * 		Author: 	Alan Cox <alan@lxorguk.ukuu.org.uk>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 * 
 *              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;

        /* Peek at the opcode, uniquefier */
	if (copy_from_user(&hdr, buf, 2 * sizeof(u_long)))
	        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);

		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);
	}

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