[linux.git] / fs / coda / psdev.c

/*
 *      	An implementation of a loadable kernel mode driver providing
 *		multiple kernel/user space bidirectional communications links.
 *
 * 		Author: 	Alan Cox <[email protected]>
 *
 *		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  <[email protected]> 
 *              Michael Callahan <[email protected]>           
 *
 *              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/smp_lock.h>
#include <linux/device.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/poll.h>
#include <asm/uaccess.h>

#include <linux/coda.h>
#include <linux/coda_linux.h>
#include <linux/coda_fs_i.h>
#include <linux/coda_psdev.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);
	if (!list_empty(&vcp->vc_pending))
                mask |= POLLIN | POLLRDNORM;

	return mask;
}

static int coda_psdev_ioctl(struct inode * inode, 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)) {
		struct super_block *sb = NULL;
                union outputArgs *dcbuf;
		int size = sizeof(*dcbuf);

		sb = vcp->vc_sb;
		if ( !sb ) {
                        count = nbytes;
                        goto out;
		}

		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 ? */
		lock_kernel();
		error = coda_downcall(hdr.opcode, dcbuf, sb);
		unlock_kernel();

		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. */
	lock_kernel();
	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;
		}
	}
	unlock_kernel();

	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 |= REQ_ABORT;
		wake_up(&req->uc_sleep);
		retval = -EFAULT;
		goto out;
	}

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

	lock_kernel();

	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;
		}
		schedule();
	}

	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 & REQ_ASYNC)) {
		req->uc_flags |= 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:
	unlock_kernel();
	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;

	lock_kernel();

	err = -EBUSY;
	vcp = &coda_comms[idx];
	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;
	}

	unlock_kernel();
	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;
	}

	lock_kernel();

	/* 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 & REQ_ASYNC) {
			CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
			kfree(req);
			continue;
		}
		req->uc_flags |= 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 |= REQ_ABORT;
		wake_up(&req->uc_sleep);
	}

	file->private_data = NULL;
	vcp->vc_inuse--;
	unlock_kernel();
	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,
	.ioctl		= coda_psdev_ioctl,
	.open		= coda_psdev_open,
	.release	= coda_psdev_release,
};

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++)
		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 <[email protected]>
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 <[email protected]>
	14	* Michael Callahan <[email protected]>
	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>
	38	#include <linux/smp_lock.h>
	39	#include <linux/device.h>
	40	#include <asm/io.h>
	41	#include <asm/system.h>
	42	#include <asm/poll.h>
	43	#include <asm/uaccess.h>
	44
	45	#include <linux/coda.h>
	46	#include <linux/coda_linux.h>
	47	#include <linux/coda_fs_i.h>
	48	#include <linux/coda_psdev.h>
1da177e4	49
c98d8cfb	50	#include "coda_int.h"
1da177e4	51
1da177e4 LT	52	/* statistics */
	53	int coda_hard; /* allows signals during upcalls */
	54	unsigned long coda_timeout = 30; /* .. secs, then signals will dequeue */
	55
	56
	57	struct venus_comm coda_comms[MAX_CODADEVS];
1db560af	58	static struct class *coda_psdev_class;
1da177e4 LT	59
	60	/*
	61	* Device operations
	62	*/
	63
	64	static unsigned int coda_psdev_poll(struct file file, poll_table wait)
	65	{
	66	struct venus_comm vcp = (struct venus_comm ) file->private_data;
	67	unsigned int mask = POLLOUT \| POLLWRNORM;
	68
	69	poll_wait(file, &vcp->vc_waitq, wait);
	70	if (!list_empty(&vcp->vc_pending))
	71	mask \|= POLLIN \| POLLRDNORM;
	72
	73	return mask;
	74	}
	75
	76	static int coda_psdev_ioctl(struct inode * inode, struct file * filp,
	77	unsigned int cmd, unsigned long arg)
	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)) {
	112	struct super_block *sb = NULL;
	113	union outputArgs *dcbuf;
	114	int size = sizeof(*dcbuf);
	115
	116	sb = vcp->vc_sb;
	117	if ( !sb ) {
	118	count = nbytes;
	119	goto out;
	120	}
	121
	122	if ( nbytes < sizeof(struct coda_out_hdr) ) {
123	printk("coda_downcall opc %d uniq %d, not enough!\n",
124	hdr.opcode, hdr.unique);
125	count = nbytes;
126	goto out;
127	}
128	if ( nbytes > size ) {
129	printk("Coda: downcall opc %d, uniq %d, too much!",
130	hdr.opcode, hdr.unique);
131	nbytes = size;
132	}
133	CODA_ALLOC(dcbuf, union outputArgs *, nbytes);
134	if (copy_from_user(dcbuf, buf, nbytes)) {
135	CODA_FREE(dcbuf, nbytes);
136	retval = -EFAULT;
137	goto out;
138	}
139
140	/* what downcall errors does Venus handle ? */
141	lock_kernel();
142	error = coda_downcall(hdr.opcode, dcbuf, sb);
143	unlock_kernel();
144
145	CODA_FREE(dcbuf, nbytes);
146	if (error) {
147	printk("psdev_write: coda_downcall error: %d\n", error);
148	retval = error;
149	goto out;
150	}
151	count = nbytes;
152	goto out;
153	}
154
155	/* Look for the message on the processing queue. */
156	lock_kernel();
157	list_for_each(lh, &vcp->vc_processing) {
158	tmp = list_entry(lh, struct upc_req , uc_chain);
159	if (tmp->uc_unique == hdr.unique) {
160	req = tmp;
161	list_del(&req->uc_chain);
162	break;
163	}
164	}
165	unlock_kernel();
166
167	if (!req) {
168	printk("psdev_write: msg (%d, %d) not found\n",
169	hdr.opcode, hdr.unique);
170	retval = -ESRCH;
171	goto out;
172	}
173
174	/* move data into response buffer. */
175	if (req->uc_outSize < nbytes) {
176	printk("psdev_write: too much cnt: %d, cnt: %ld, opc: %d, uniq: %d.\n",
177	req->uc_outSize, (long)nbytes, hdr.opcode, hdr.unique);
178	nbytes = req->uc_outSize; /* don't have more space! */
179	}
180	if (copy_from_user(req->uc_data, buf, nbytes)) {
181	req->uc_flags \|= REQ_ABORT;
182	wake_up(&req->uc_sleep);
183	retval = -EFAULT;
184	goto out;
185	}
186
187	/* adjust outsize. is this useful ?? */
188	req->uc_outSize = nbytes;
189	req->uc_flags \|= REQ_WRITE;
190	count = nbytes;
191
192	/* Convert filedescriptor into a file handle */
193	if (req->uc_opcode == CODA_OPEN_BY_FD) {
194	struct coda_open_by_fd_out *outp =
195	(struct coda_open_by_fd_out *)req->uc_data;
38c2e437 JH	196	if (!outp->oh.result)
38c2e437 JH	197	outp->fh = fget(outp->fd);
1da177e4 LT	198	}
	199
	200	wake_up(&req->uc_sleep);
	201	out:
	202	return(count ? count : retval);
	203	}
	204
	205	/*
	206	* Read a message from the kernel to Venus
	207	*/
	208
	209	static ssize_t coda_psdev_read(struct file * file, char __user * buf,
	210	size_t nbytes, loff_t *off)
	211	{
	212	DECLARE_WAITQUEUE(wait, current);
	213	struct venus_comm vcp = (struct venus_comm ) file->private_data;
	214	struct upc_req *req;
	215	ssize_t retval = 0, count = 0;
	216
	217	if (nbytes == 0)
	218	return 0;
	219
	220	lock_kernel();
	221
	222	add_wait_queue(&vcp->vc_waitq, &wait);
	223	set_current_state(TASK_INTERRUPTIBLE);
	224
	225	while (list_empty(&vcp->vc_pending)) {
	226	if (file->f_flags & O_NONBLOCK) {
	227	retval = -EAGAIN;
	228	break;
	229	}
	230	if (signal_pending(current)) {
	231	retval = -ERESTARTSYS;
	232	break;
	233	}
	234	schedule();
	235	}
	236
	237	set_current_state(TASK_RUNNING);
	238	remove_wait_queue(&vcp->vc_waitq, &wait);
	239
	240	if (retval)
	241	goto out;
	242
	243	req = list_entry(vcp->vc_pending.next, struct upc_req,uc_chain);
	244	list_del(&req->uc_chain);
	245
	246	/* Move the input args into userspace */
	247	count = req->uc_inSize;
	248	if (nbytes < req->uc_inSize) {
	249	printk ("psdev_read: Venus read %ld bytes of %d in message\n",
	250	(long)nbytes, req->uc_inSize);
	251	count = nbytes;
	252	}
	253
	254	if (copy_to_user(buf, req->uc_data, count))
	255	retval = -EFAULT;
	256
	257	/* If request was not a signal, enqueue and don't free */
	258	if (!(req->uc_flags & REQ_ASYNC)) {
	259	req->uc_flags \|= REQ_READ;
8e13059a	260	list_add_tail(&(req->uc_chain), &vcp->vc_processing);
1da177e4 LT	261	goto out;
	262	}
	263
	264	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
37461e19	265	kfree(req);
1da177e4 LT	266	out:
	267	unlock_kernel();
	268	return (count ? count : retval);
	269	}
	270
	271	static int coda_psdev_open(struct inode * inode, struct file * file)
	272	{
87065519 JH	273	struct venus_comm *vcp;
87065519 JH	274	int idx, err;
1da177e4	275
1da177e4	276	idx = iminor(inode);
87065519	277	if (idx < 0 \|\| idx >= MAX_CODADEVS)
1da177e4	278	return -ENODEV;
1da177e4	279
87065519 JH	280	lock_kernel();
	281
	282	err = -EBUSY;
1da177e4	283	vcp = &coda_comms[idx];
87065519 JH	284	if (!vcp->vc_inuse) {
	285	vcp->vc_inuse++;
	286
1da177e4 LT	287	INIT_LIST_HEAD(&vcp->vc_pending);
	288	INIT_LIST_HEAD(&vcp->vc_processing);
	289	init_waitqueue_head(&vcp->vc_waitq);
	290	vcp->vc_sb = NULL;
	291	vcp->vc_seq = 0;
87065519 JH	292
	293	file->private_data = vcp;
	294	err = 0;
1da177e4	295	}
1da177e4 LT	296
1da177e4 LT	297	unlock_kernel();
87065519	298	return err;
1da177e4 LT	299	}
	300
	301
	302	static int coda_psdev_release(struct inode * inode, struct file * file)
	303	{
87065519 JH	304	struct venus_comm vcp = (struct venus_comm ) file->private_data;
87065519 JH	305	struct upc_req req, tmp;
1da177e4	306
87065519	307	if (!vcp \|\| !vcp->vc_inuse ) {
1da177e4 LT	308	printk("psdev_release: Not open.\n");
	309	return -1;
	310	}
	311
87065519 JH	312	lock_kernel();
	313
	314	/* Wakeup clients so they can return. */
1da177e4	315	list_for_each_entry_safe(req, tmp, &vcp->vc_pending, uc_chain) {
87065519 JH	316	list_del(&req->uc_chain);
87065519 JH	317
1da177e4 LT	318	/* Async requests need to be freed here */
	319	if (req->uc_flags & REQ_ASYNC) {
	320	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
37461e19	321	kfree(req);
1da177e4 LT	322	continue;
	323	}
	324	req->uc_flags \|= REQ_ABORT;
	325	wake_up(&req->uc_sleep);
87065519 JH	326	}
	327
	328	list_for_each_entry_safe(req, tmp, &vcp->vc_processing, uc_chain) {
	329	list_del(&req->uc_chain);
	330
1da177e4	331	req->uc_flags \|= REQ_ABORT;
87065519 JH	332	wake_up(&req->uc_sleep);
87065519 JH	333	}
1da177e4	334
87065519 JH	335	file->private_data = NULL;
87065519 JH	336	vcp->vc_inuse--;
1da177e4 LT	337	unlock_kernel();
	338	return 0;
	339	}
	340
	341
4b6f5d20	342	static const struct file_operations coda_psdev_fops = {
1da177e4 LT	343	.owner = THIS_MODULE,
	344	.read = coda_psdev_read,
	345	.write = coda_psdev_write,
	346	.poll = coda_psdev_poll,
	347	.ioctl = coda_psdev_ioctl,
	348	.open = coda_psdev_open,
	349	.release = coda_psdev_release,
	350	};
	351
	352	static int init_coda_psdev(void)
	353	{
	354	int i, err = 0;
	355	if (register_chrdev(CODA_PSDEV_MAJOR, "coda", &coda_psdev_fops)) {
	356	printk(KERN_ERR "coda_psdev: unable to get major %d\n",
	357	CODA_PSDEV_MAJOR);
	358	return -EIO;
	359	}
1db560af	360	coda_psdev_class = class_create(THIS_MODULE, "coda");
1da177e4 LT	361	if (IS_ERR(coda_psdev_class)) {
	362	err = PTR_ERR(coda_psdev_class);
	363	goto out_chrdev;
	364	}
7c69ef79	365	for (i = 0; i < MAX_CODADEVS; i++)
a9b12619 GKH	366	device_create(coda_psdev_class, NULL,
a9b12619 GKH	367	MKDEV(CODA_PSDEV_MAJOR, i), NULL, "cfs%d", i);
1da177e4 LT	368	coda_sysctl_init();
	369	goto out;
	370
1da177e4 LT	371	out_chrdev:
	372	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	373	out:
	374	return err;
	375	}
	376
5b7f13bd JH	377	MODULE_AUTHOR("Jan Harkes, Peter J. Braam");
	378	MODULE_DESCRIPTION("Coda Distributed File System VFS interface");
	379	MODULE_ALIAS_CHARDEV_MAJOR(CODA_PSDEV_MAJOR);
1da177e4	380	MODULE_LICENSE("GPL");
5b7f13bd	381	MODULE_VERSION("6.6");
1da177e4	382
1da177e4 LT	383	static int __init init_coda(void)
	384	{
	385	int status;
	386	int i;
1da177e4 LT	387
	388	status = coda_init_inodecache();
	389	if (status)
	390	goto out2;
	391	status = init_coda_psdev();
	392	if ( status ) {
	393	printk("Problem (%d) in init_coda_psdev\n", status);
	394	goto out1;
	395	}
	396
	397	status = register_filesystem(&coda_fs_type);
	398	if (status) {
	399	printk("coda: failed to register filesystem!\n");
	400	goto out;
	401	}
	402	return 0;
	403	out:
8ab5e4c1	404	for (i = 0; i < MAX_CODADEVS; i++)
62ca8792	405	device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
1db560af	406	class_destroy(coda_psdev_class);
1da177e4 LT	407	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	408	coda_sysctl_clean();
	409	out1:
	410	coda_destroy_inodecache();
	411	out2:
	412	return status;
	413	}
	414
	415	static void __exit exit_coda(void)
	416	{
	417	int err, i;
	418
	419	err = unregister_filesystem(&coda_fs_type);
	420	if ( err != 0 ) {
	421	printk("coda: failed to unregister filesystem\n");
	422	}
8ab5e4c1	423	for (i = 0; i < MAX_CODADEVS; i++)
62ca8792	424	device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
1db560af	425	class_destroy(coda_psdev_class);
1da177e4 LT	426	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	427	coda_sysctl_clean();
	428	coda_destroy_inodecache();
	429	}
	430
	431	module_init(init_coda);
	432	module_exit(exit_coda);
	433