[mirror_ubuntu-artful-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.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 <asm/io.h>
#include <asm/poll.h>
#include <asm/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 unsigned int coda_psdev_poll(struct file *file, poll_table * wait)
{
        struct venus_comm *vcp = (struct venus_comm *) file->private_data;
	unsigned int mask = POLLOUT | POLLWRNORM;

	poll_wait(file, &vcp->vc_waitq, wait);
	mutex_lock(&vcp->vc_mutex);
	if (!list_empty(&vcp->vc_pending))
                mask |= POLLIN | POLLRDNORM;
	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) ) {
		        printk("coda_downcall opc %d uniq %d, not enough!\n",
			       hdr.opcode, hdr.unique);
			count = nbytes;
			goto out;
		}
		if ( nbytes > size ) {
		        printk("Coda: 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) {
		        printk("psdev_write: coda_downcall error: %d\n", 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) {
		printk("psdev_write: msg (%d, %d) not found\n", 
			hdr.opcode, hdr.unique);
		retval = -ESRCH;
		goto out;
	}

        /* move data into response buffer. */
	if (req->uc_outSize < nbytes) {
                printk("psdev_write: too much cnt: %d, cnt: %ld, opc: %d, uniq: %d.\n",
		       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) {
                printk ("psdev_read: Venus read %ld bytes of %d in message\n",
			(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;

	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 ) {
		printk("psdev_release: Not open.\n");
		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)) {
              printk(KERN_ERR "coda_psdev: unable to get major %d\n", 
		     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 ) {
		printk("Problem (%d) in init_coda_psdev\n", status);
		goto out1;
	}
	
	status = register_filesystem(&coda_fs_type);
	if (status) {
		printk("coda: 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 ) {
                printk("coda: 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>
a99bbaf5	25	#include <linux/sched.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 LT	39	#include <linux/device.h>
1da177e4 LT	40	#include <asm/io.h>
1da177e4 LT	41	#include <asm/poll.h>
	42	#include <asm/uaccess.h>
	43
	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
	63	static unsigned int coda_psdev_poll(struct file file, poll_table wait)
	64	{
	65	struct venus_comm vcp = (struct venus_comm ) file->private_data;
	66	unsigned int mask = POLLOUT \| POLLWRNORM;
	67
	68	poll_wait(file, &vcp->vc_waitq, wait);
da47c19e	69	mutex_lock(&vcp->vc_mutex);
1da177e4 LT	70	if (!list_empty(&vcp->vc_pending))
1da177e4 LT	71	mask \|= POLLIN \| POLLRDNORM;
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 LT	115	if ( nbytes < sizeof(struct coda_out_hdr) ) {
	116	printk("coda_downcall opc %d uniq %d, not enough!\n",
	117	hdr.opcode, hdr.unique);
	118	count = nbytes;
	119	goto out;
	120	}
	121	if ( nbytes > size ) {
	122	printk("Coda: downcall opc %d, uniq %d, too much!",
	123	hdr.opcode, hdr.unique);
	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) {
	138	printk("psdev_write: coda_downcall error: %d\n", error);
	139	retval = error;
	140	goto out;
	141	}
	142	count = nbytes;
	143	goto out;
	144	}
	145
	146	/* Look for the message on the processing queue. */
da47c19e	147	mutex_lock(&vcp->vc_mutex);
1da177e4 LT	148	list_for_each(lh, &vcp->vc_processing) {
	149	tmp = list_entry(lh, struct upc_req , uc_chain);
	150	if (tmp->uc_unique == hdr.unique) {
	151	req = tmp;
	152	list_del(&req->uc_chain);
	153	break;
	154	}
	155	}
da47c19e	156	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	157
	158	if (!req) {
	159	printk("psdev_write: msg (%d, %d) not found\n",
	160	hdr.opcode, hdr.unique);
	161	retval = -ESRCH;
	162	goto out;
	163	}
	164
	165	/* move data into response buffer. */
	166	if (req->uc_outSize < nbytes) {
	167	printk("psdev_write: too much cnt: %d, cnt: %ld, opc: %d, uniq: %d.\n",
	168	req->uc_outSize, (long)nbytes, hdr.opcode, hdr.unique);
	169	nbytes = req->uc_outSize; /* don't have more space! */
	170	}
	171	if (copy_from_user(req->uc_data, buf, nbytes)) {
4aeefdc6	172	req->uc_flags \|= CODA_REQ_ABORT;
1da177e4 LT	173	wake_up(&req->uc_sleep);
	174	retval = -EFAULT;
	175	goto out;
	176	}
	177
	178	/* adjust outsize. is this useful ?? */
112d421d JH	179	req->uc_outSize = nbytes;
112d421d JH	180	req->uc_flags \|= CODA_REQ_WRITE;
1da177e4 LT	181	count = nbytes;
	182
	183	/* Convert filedescriptor into a file handle */
	184	if (req->uc_opcode == CODA_OPEN_BY_FD) {
	185	struct coda_open_by_fd_out *outp =
	186	(struct coda_open_by_fd_out *)req->uc_data;
38c2e437 JH	187	if (!outp->oh.result)
38c2e437 JH	188	outp->fh = fget(outp->fd);
1da177e4 LT	189	}
	190
	191	wake_up(&req->uc_sleep);
	192	out:
	193	return(count ? count : retval);
	194	}
	195
	196	/*
	197	* Read a message from the kernel to Venus
	198	*/
	199
	200	static ssize_t coda_psdev_read(struct file * file, char __user * buf,
	201	size_t nbytes, loff_t *off)
	202	{
	203	DECLARE_WAITQUEUE(wait, current);
	204	struct venus_comm vcp = (struct venus_comm ) file->private_data;
	205	struct upc_req *req;
	206	ssize_t retval = 0, count = 0;
	207
	208	if (nbytes == 0)
	209	return 0;
	210
da47c19e	211	mutex_lock(&vcp->vc_mutex);
1da177e4 LT	212
	213	add_wait_queue(&vcp->vc_waitq, &wait);
	214	set_current_state(TASK_INTERRUPTIBLE);
	215
	216	while (list_empty(&vcp->vc_pending)) {
	217	if (file->f_flags & O_NONBLOCK) {
	218	retval = -EAGAIN;
	219	break;
	220	}
	221	if (signal_pending(current)) {
	222	retval = -ERESTARTSYS;
	223	break;
	224	}
da47c19e	225	mutex_unlock(&vcp->vc_mutex);
1da177e4	226	schedule();
da47c19e	227	mutex_lock(&vcp->vc_mutex);
1da177e4 LT	228	}
	229
	230	set_current_state(TASK_RUNNING);
	231	remove_wait_queue(&vcp->vc_waitq, &wait);
	232
	233	if (retval)
	234	goto out;
	235
	236	req = list_entry(vcp->vc_pending.next, struct upc_req,uc_chain);
	237	list_del(&req->uc_chain);
	238
	239	/* Move the input args into userspace */
	240	count = req->uc_inSize;
	241	if (nbytes < req->uc_inSize) {
	242	printk ("psdev_read: Venus read %ld bytes of %d in message\n",
	243	(long)nbytes, req->uc_inSize);
	244	count = nbytes;
	245	}
	246
	247	if (copy_to_user(buf, req->uc_data, count))
	248	retval = -EFAULT;
	249
	250	/* If request was not a signal, enqueue and don't free */
4aeefdc6 JA	251	if (!(req->uc_flags & CODA_REQ_ASYNC)) {
4aeefdc6 JA	252	req->uc_flags \|= CODA_REQ_READ;
8e13059a	253	list_add_tail(&(req->uc_chain), &vcp->vc_processing);
1da177e4 LT	254	goto out;
	255	}
	256
	257	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
37461e19	258	kfree(req);
1da177e4	259	out:
da47c19e	260	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	261	return (count ? count : retval);
	262	}
	263
	264	static int coda_psdev_open(struct inode * inode, struct file * file)
	265	{
87065519 JH	266	struct venus_comm *vcp;
87065519 JH	267	int idx, err;
1da177e4	268
1da177e4	269	idx = iminor(inode);
87065519	270	if (idx < 0 \|\| idx >= MAX_CODADEVS)
1da177e4	271	return -ENODEV;
1da177e4	272
87065519	273	err = -EBUSY;
1da177e4	274	vcp = &coda_comms[idx];
da47c19e YA	275	mutex_lock(&vcp->vc_mutex);
da47c19e YA	276
87065519 JH	277	if (!vcp->vc_inuse) {
	278	vcp->vc_inuse++;
	279
1da177e4 LT	280	INIT_LIST_HEAD(&vcp->vc_pending);
	281	INIT_LIST_HEAD(&vcp->vc_processing);
	282	init_waitqueue_head(&vcp->vc_waitq);
	283	vcp->vc_sb = NULL;
	284	vcp->vc_seq = 0;
87065519 JH	285
	286	file->private_data = vcp;
	287	err = 0;
1da177e4	288	}
1da177e4	289
da47c19e	290	mutex_unlock(&vcp->vc_mutex);
87065519	291	return err;
1da177e4 LT	292	}
	293
	294
	295	static int coda_psdev_release(struct inode * inode, struct file * file)
	296	{
87065519 JH	297	struct venus_comm vcp = (struct venus_comm ) file->private_data;
87065519 JH	298	struct upc_req req, tmp;
1da177e4	299
87065519	300	if (!vcp \|\| !vcp->vc_inuse ) {
1da177e4 LT	301	printk("psdev_release: Not open.\n");
	302	return -1;
	303	}
	304
da47c19e	305	mutex_lock(&vcp->vc_mutex);
87065519 JH	306
87065519 JH	307	/* Wakeup clients so they can return. */
1da177e4	308	list_for_each_entry_safe(req, tmp, &vcp->vc_pending, uc_chain) {
87065519 JH	309	list_del(&req->uc_chain);
87065519 JH	310
1da177e4	311	/* Async requests need to be freed here */
4aeefdc6	312	if (req->uc_flags & CODA_REQ_ASYNC) {
1da177e4	313	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
37461e19	314	kfree(req);
1da177e4 LT	315	continue;
1da177e4 LT	316	}
4aeefdc6	317	req->uc_flags \|= CODA_REQ_ABORT;
1da177e4	318	wake_up(&req->uc_sleep);
87065519 JH	319	}
	320
	321	list_for_each_entry_safe(req, tmp, &vcp->vc_processing, uc_chain) {
	322	list_del(&req->uc_chain);
	323
4aeefdc6	324	req->uc_flags \|= CODA_REQ_ABORT;
87065519 JH	325	wake_up(&req->uc_sleep);
87065519 JH	326	}
1da177e4	327
87065519 JH	328	file->private_data = NULL;
87065519 JH	329	vcp->vc_inuse--;
da47c19e	330	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	331	return 0;
	332	}
	333
	334
4b6f5d20	335	static const struct file_operations coda_psdev_fops = {
1da177e4 LT	336	.owner = THIS_MODULE,
	337	.read = coda_psdev_read,
	338	.write = coda_psdev_write,
	339	.poll = coda_psdev_poll,
97718390	340	.unlocked_ioctl = coda_psdev_ioctl,
1da177e4 LT	341	.open = coda_psdev_open,
1da177e4 LT	342	.release = coda_psdev_release,
6038f373	343	.llseek = noop_llseek,
1da177e4 LT	344	};
	345
	346	static int init_coda_psdev(void)
	347	{
	348	int i, err = 0;
	349	if (register_chrdev(CODA_PSDEV_MAJOR, "coda", &coda_psdev_fops)) {
	350	printk(KERN_ERR "coda_psdev: unable to get major %d\n",
	351	CODA_PSDEV_MAJOR);
	352	return -EIO;
	353	}
1db560af	354	coda_psdev_class = class_create(THIS_MODULE, "coda");
1da177e4 LT	355	if (IS_ERR(coda_psdev_class)) {
	356	err = PTR_ERR(coda_psdev_class);
	357	goto out_chrdev;
	358	}
da47c19e YA	359	for (i = 0; i < MAX_CODADEVS; i++) {
da47c19e YA	360	mutex_init(&(&coda_comms[i])->vc_mutex);
a9b12619 GKH	361	device_create(coda_psdev_class, NULL,
a9b12619 GKH	362	MKDEV(CODA_PSDEV_MAJOR, i), NULL, "cfs%d", i);
da47c19e	363	}
1da177e4 LT	364	coda_sysctl_init();
	365	goto out;
	366
1da177e4 LT	367	out_chrdev:
	368	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	369	out:
	370	return err;
	371	}
	372
5b7f13bd JH	373	MODULE_AUTHOR("Jan Harkes, Peter J. Braam");
	374	MODULE_DESCRIPTION("Coda Distributed File System VFS interface");
	375	MODULE_ALIAS_CHARDEV_MAJOR(CODA_PSDEV_MAJOR);
1da177e4	376	MODULE_LICENSE("GPL");
5b7f13bd	377	MODULE_VERSION("6.6");
1da177e4	378
1da177e4 LT	379	static int __init init_coda(void)
	380	{
	381	int status;
	382	int i;
1da177e4 LT	383
	384	status = coda_init_inodecache();
	385	if (status)
	386	goto out2;
	387	status = init_coda_psdev();
	388	if ( status ) {
	389	printk("Problem (%d) in init_coda_psdev\n", status);
	390	goto out1;
	391	}
	392
	393	status = register_filesystem(&coda_fs_type);
	394	if (status) {
	395	printk("coda: failed to register filesystem!\n");
	396	goto out;
	397	}
	398	return 0;
	399	out:
8ab5e4c1	400	for (i = 0; i < MAX_CODADEVS; i++)
62ca8792	401	device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
1db560af	402	class_destroy(coda_psdev_class);
1da177e4 LT	403	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	404	coda_sysctl_clean();
	405	out1:
	406	coda_destroy_inodecache();
	407	out2:
	408	return status;
	409	}
	410
	411	static void __exit exit_coda(void)
	412	{
	413	int err, i;
	414
	415	err = unregister_filesystem(&coda_fs_type);
	416	if ( err != 0 ) {
	417	printk("coda: failed to unregister filesystem\n");
	418	}
8ab5e4c1	419	for (i = 0; i < MAX_CODADEVS; i++)
62ca8792	420	device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
1db560af	421	class_destroy(coda_psdev_class);
1da177e4 LT	422	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	423	coda_sysctl_clean();
	424	coda_destroy_inodecache();
	425	}
	426
	427	module_init(init_coda);
	428	module_exit(exit_coda);
	429