[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@redhat.com>
 *
 *		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/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/devfs_fs_kernel.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 <linux/coda_proc.h>

#define upc_free(r) kfree(r)

/* 
 * Coda stuff
 */
extern struct file_system_type coda_fs_type;

/* 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_simple *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;
		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(&(req->uc_chain), vcp->vc_processing.prev);
		goto out;
	}

	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
	upc_free(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;

	lock_kernel();
	idx = iminor(inode);
	if(idx >= MAX_CODADEVS) {
		unlock_kernel();
		return -ENODEV;
	}

	vcp = &coda_comms[idx];
	if(vcp->vc_inuse) {
		unlock_kernel();
		return -EBUSY;
	}
	
	if (!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;

	unlock_kernel();
        return 0;
}


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;

	lock_kernel();
	if ( !vcp->vc_inuse ) {
		unlock_kernel();
		printk("psdev_release: Not open.\n");
		return -1;
	}

	if (--vcp->vc_inuse) {
		unlock_kernel();
		return 0;
	}
        
        /* Wakeup clients so they can return. */
	list_for_each_entry_safe(req, tmp, &vcp->vc_pending, 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));
			upc_free(req);
			continue;
		}
		req->uc_flags |= REQ_ABORT;
		wake_up(&req->uc_sleep);
        }
        
	list_for_each_entry(req, &vcp->vc_processing, uc_chain) {
		req->uc_flags |= REQ_ABORT;
	        wake_up(&req->uc_sleep);
        }

	unlock_kernel();
	return 0;
}


static 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_simple_create(THIS_MODULE, "coda");
	if (IS_ERR(coda_psdev_class)) {
		err = PTR_ERR(coda_psdev_class);
		goto out_chrdev;
	}		
	devfs_mk_dir ("coda");
	for (i = 0; i < MAX_CODADEVS; i++) {
		class_simple_device_add(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR,i), 
				NULL, "cfs%d", i);
		err = devfs_mk_cdev(MKDEV(CODA_PSDEV_MAJOR, i),
				S_IFCHR|S_IRUSR|S_IWUSR, "coda/%d", i);
		if (err)
			goto out_class;
	}
	coda_sysctl_init();
	goto out;

out_class:
	for (i = 0; i < MAX_CODADEVS; i++) 
		class_simple_device_remove(MKDEV(CODA_PSDEV_MAJOR, i));
	class_simple_destroy(coda_psdev_class);
out_chrdev:
	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
out:
	return err;
}


MODULE_AUTHOR("Peter J. Braam <braam@cs.cmu.edu>");
MODULE_LICENSE("GPL");

extern int coda_init_inodecache(void);
extern void coda_destroy_inodecache(void);
static int __init init_coda(void)
{
	int status;
	int i;
	printk(KERN_INFO "Coda Kernel/Venus communications, "
#ifdef CONFIG_CODA_FS_OLD_API
	       "v5.3.20"
#else
	       "v6.0.0"
#endif
	       ", coda@cs.cmu.edu\n");

	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++) {
		class_simple_device_remove(MKDEV(CODA_PSDEV_MAJOR, i));
		devfs_remove("coda/%d", i);
	}
	class_simple_destroy(coda_psdev_class);
	devfs_remove("coda");
	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++) {
		class_simple_device_remove(MKDEV(CODA_PSDEV_MAJOR, i));
		devfs_remove("coda/%d", i);
	}
	class_simple_destroy(coda_psdev_class);
	devfs_remove("coda");
	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	*
	5	* Author: Alan Cox <alan@redhat.com>
	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>
	25	#include <linux/slab.h>
	26	#include <linux/ioport.h>
	27	#include <linux/fcntl.h>
	28	#include <linux/delay.h>
	29	#include <linux/skbuff.h>
	30	#include <linux/proc_fs.h>
	31	#include <linux/devfs_fs_kernel.h>
	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>
	49	#include <linux/coda_proc.h>
	50
	51	#define upc_free(r) kfree(r)
	52
	53	/*
	54	* Coda stuff
	55	*/
	56	extern struct file_system_type coda_fs_type;
	57
	58	/* statistics */
	59	int coda_hard; /* allows signals during upcalls */
	60	unsigned long coda_timeout = 30; /* .. secs, then signals will dequeue */
	61
	62
	63	struct venus_comm coda_comms[MAX_CODADEVS];
	64	static struct class_simple *coda_psdev_class;
65
66	/*
67	* Device operations
68	*/
69
70	static unsigned int coda_psdev_poll(struct file file, poll_table wait)
71	{
72	struct venus_comm vcp = (struct venus_comm ) file->private_data;
73	unsigned int mask = POLLOUT \| POLLWRNORM;
74
75	poll_wait(file, &vcp->vc_waitq, wait);
76	if (!list_empty(&vcp->vc_pending))
77	mask \|= POLLIN \| POLLRDNORM;
78
79	return mask;
80	}
81
82	static int coda_psdev_ioctl(struct inode * inode, struct file * filp,
83	unsigned int cmd, unsigned long arg)
84	{
85	unsigned int data;
86
87	switch(cmd) {
88	case CIOC_KERNEL_VERSION:
89	data = CODA_KERNEL_VERSION;
90	return put_user(data, (int __user *) arg);
91	default:
92	return -ENOTTY;
93	}
94
95	return 0;
96	}
97
98	/*
99	* Receive a message written by Venus to the psdev
100	*/
101
102	static ssize_t coda_psdev_write(struct file file, const char __user buf,
103	size_t nbytes, loff_t *off)
104	{
105	struct venus_comm vcp = (struct venus_comm ) file->private_data;
106	struct upc_req *req = NULL;
107	struct upc_req *tmp;
108	struct list_head *lh;
109	struct coda_in_hdr hdr;
110	ssize_t retval = 0, count = 0;
111	int error;
112
113	/* Peek at the opcode, uniquefier */
114	if (copy_from_user(&hdr, buf, 2 * sizeof(u_long)))
115	return -EFAULT;
116
117	if (DOWNCALL(hdr.opcode)) {
118	struct super_block *sb = NULL;
119	union outputArgs *dcbuf;
120	int size = sizeof(*dcbuf);
121
122	sb = vcp->vc_sb;
123	if ( !sb ) {
124	count = nbytes;
125	goto out;
126	}
127
128	if ( nbytes < sizeof(struct coda_out_hdr) ) {
129	printk("coda_downcall opc %d uniq %d, not enough!\n",
130	hdr.opcode, hdr.unique);
131	count = nbytes;
132	goto out;
133	}
134	if ( nbytes > size ) {
135	printk("Coda: downcall opc %d, uniq %d, too much!",
136	hdr.opcode, hdr.unique);
137	nbytes = size;
138	}
139	CODA_ALLOC(dcbuf, union outputArgs *, nbytes);
140	if (copy_from_user(dcbuf, buf, nbytes)) {
141	CODA_FREE(dcbuf, nbytes);
142	retval = -EFAULT;
143	goto out;
144	}
145
146	/* what downcall errors does Venus handle ? */
147	lock_kernel();
148	error = coda_downcall(hdr.opcode, dcbuf, sb);
149	unlock_kernel();
150
151	CODA_FREE(dcbuf, nbytes);
152	if (error) {
153	printk("psdev_write: coda_downcall error: %d\n", error);
154	retval = error;
155	goto out;
156	}
157	count = nbytes;
158	goto out;
159	}
160
161	/* Look for the message on the processing queue. */
162	lock_kernel();
163	list_for_each(lh, &vcp->vc_processing) {
164	tmp = list_entry(lh, struct upc_req , uc_chain);
165	if (tmp->uc_unique == hdr.unique) {
166	req = tmp;
167	list_del(&req->uc_chain);
168	break;
169	}
170	}
171	unlock_kernel();
172
173	if (!req) {
174	printk("psdev_write: msg (%d, %d) not found\n",
175	hdr.opcode, hdr.unique);
176	retval = -ESRCH;
177	goto out;
178	}
179
180	/* move data into response buffer. */
181	if (req->uc_outSize < nbytes) {
182	printk("psdev_write: too much cnt: %d, cnt: %ld, opc: %d, uniq: %d.\n",
183	req->uc_outSize, (long)nbytes, hdr.opcode, hdr.unique);
184	nbytes = req->uc_outSize; /* don't have more space! */
185	}
186	if (copy_from_user(req->uc_data, buf, nbytes)) {
187	req->uc_flags \|= REQ_ABORT;
188	wake_up(&req->uc_sleep);
189	retval = -EFAULT;
190	goto out;
191	}
192
193	/* adjust outsize. is this useful ?? */
194	req->uc_outSize = nbytes;
195	req->uc_flags \|= REQ_WRITE;
196	count = nbytes;
197
198	/* Convert filedescriptor into a file handle */
199	if (req->uc_opcode == CODA_OPEN_BY_FD) {
200	struct coda_open_by_fd_out *outp =
201	(struct coda_open_by_fd_out *)req->uc_data;
202	outp->fh = fget(outp->fd);
203	}
204
205	wake_up(&req->uc_sleep);
206	out:
207	return(count ? count : retval);
208	}
209
210	/*
211	* Read a message from the kernel to Venus
212	*/
213
214	static ssize_t coda_psdev_read(struct file * file, char __user * buf,
215	size_t nbytes, loff_t *off)
216	{
217	DECLARE_WAITQUEUE(wait, current);
218	struct venus_comm vcp = (struct venus_comm ) file->private_data;
219	struct upc_req *req;
220	ssize_t retval = 0, count = 0;
221
222	if (nbytes == 0)
223	return 0;
224
225	lock_kernel();
226
227	add_wait_queue(&vcp->vc_waitq, &wait);
228	set_current_state(TASK_INTERRUPTIBLE);
229
230	while (list_empty(&vcp->vc_pending)) {
231	if (file->f_flags & O_NONBLOCK) {
232	retval = -EAGAIN;
233	break;
234	}
235	if (signal_pending(current)) {
236	retval = -ERESTARTSYS;
237	break;
238	}
239	schedule();
240	}
241
242	set_current_state(TASK_RUNNING);
243	remove_wait_queue(&vcp->vc_waitq, &wait);
244
245	if (retval)
246	goto out;
247
248	req = list_entry(vcp->vc_pending.next, struct upc_req,uc_chain);
249	list_del(&req->uc_chain);
250
251	/* Move the input args into userspace */
252	count = req->uc_inSize;
253	if (nbytes < req->uc_inSize) {
254	printk ("psdev_read: Venus read %ld bytes of %d in message\n",
255	(long)nbytes, req->uc_inSize);
256	count = nbytes;
257	}
258
259	if (copy_to_user(buf, req->uc_data, count))
260	retval = -EFAULT;
261
262	/* If request was not a signal, enqueue and don't free */
263	if (!(req->uc_flags & REQ_ASYNC)) {
264	req->uc_flags \|= REQ_READ;
265	list_add(&(req->uc_chain), vcp->vc_processing.prev);
266	goto out;
267	}
268
269	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
270	upc_free(req);
271	out:
272	unlock_kernel();
273	return (count ? count : retval);
274	}
275
276	static int coda_psdev_open(struct inode * inode, struct file * file)
277	{
278	struct venus_comm *vcp;
279	int idx;
280
281	lock_kernel();
282	idx = iminor(inode);
283	if(idx >= MAX_CODADEVS) {
284	unlock_kernel();
285	return -ENODEV;
286	}
287
288	vcp = &coda_comms[idx];
289	if(vcp->vc_inuse) {
290	unlock_kernel();
291	return -EBUSY;
292	}
293
294	if (!vcp->vc_inuse++) {
295	INIT_LIST_HEAD(&vcp->vc_pending);
296	INIT_LIST_HEAD(&vcp->vc_processing);
297	init_waitqueue_head(&vcp->vc_waitq);
298	vcp->vc_sb = NULL;
299	vcp->vc_seq = 0;
300	}
301
302	file->private_data = vcp;
303
304	unlock_kernel();
305	return 0;
306	}
307
308
309	static int coda_psdev_release(struct inode * inode, struct file * file)
310	{
311	struct venus_comm vcp = (struct venus_comm ) file->private_data;
312	struct upc_req req, tmp;
313
314	lock_kernel();
315	if ( !vcp->vc_inuse ) {
316	unlock_kernel();
317	printk("psdev_release: Not open.\n");
318	return -1;
319	}
320
321	if (--vcp->vc_inuse) {
322	unlock_kernel();
323	return 0;
324	}
325
326	/* Wakeup clients so they can return. */
327	list_for_each_entry_safe(req, tmp, &vcp->vc_pending, uc_chain) {
328	/* Async requests need to be freed here */
329	if (req->uc_flags & REQ_ASYNC) {
330	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
331	upc_free(req);
332	continue;
333	}
334	req->uc_flags \|= REQ_ABORT;
335	wake_up(&req->uc_sleep);
336	}
337
338	list_for_each_entry(req, &vcp->vc_processing, uc_chain) {
339	req->uc_flags \|= REQ_ABORT;
340	wake_up(&req->uc_sleep);
341	}
342
343	unlock_kernel();
344	return 0;
345	}
346
347
348	static struct file_operations coda_psdev_fops = {
349	.owner = THIS_MODULE,
350	.read = coda_psdev_read,
351	.write = coda_psdev_write,
352	.poll = coda_psdev_poll,
353	.ioctl = coda_psdev_ioctl,
354	.open = coda_psdev_open,
355	.release = coda_psdev_release,
356	};
357
358	static int init_coda_psdev(void)
359	{
360	int i, err = 0;
361	if (register_chrdev(CODA_PSDEV_MAJOR, "coda", &coda_psdev_fops)) {
362	printk(KERN_ERR "coda_psdev: unable to get major %d\n",
363	CODA_PSDEV_MAJOR);
364	return -EIO;
365	}
366	coda_psdev_class = class_simple_create(THIS_MODULE, "coda");
367	if (IS_ERR(coda_psdev_class)) {
368	err = PTR_ERR(coda_psdev_class);
369	goto out_chrdev;
370	}
371	devfs_mk_dir ("coda");
372	for (i = 0; i < MAX_CODADEVS; i++) {
373	class_simple_device_add(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR,i),
374	NULL, "cfs%d", i);
375	err = devfs_mk_cdev(MKDEV(CODA_PSDEV_MAJOR, i),
376	S_IFCHR\|S_IRUSR\|S_IWUSR, "coda/%d", i);
377	if (err)
378	goto out_class;
379	}
380	coda_sysctl_init();
381	goto out;
382
383	out_class:
384	for (i = 0; i < MAX_CODADEVS; i++)
385	class_simple_device_remove(MKDEV(CODA_PSDEV_MAJOR, i));
386	class_simple_destroy(coda_psdev_class);
387	out_chrdev:
388	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
389	out:
390	return err;
391	}
392
393
394	MODULE_AUTHOR("Peter J. Braam <braam@cs.cmu.edu>");
395	MODULE_LICENSE("GPL");
396
397	extern int coda_init_inodecache(void);
398	extern void coda_destroy_inodecache(void);
399	static int __init init_coda(void)
400	{
401	int status;
402	int i;
403	printk(KERN_INFO "Coda Kernel/Venus communications, "
404	#ifdef CONFIG_CODA_FS_OLD_API
405	"v5.3.20"
406	#else
407	"v6.0.0"
408	#endif
409	", coda@cs.cmu.edu\n");
410
411	status = coda_init_inodecache();
412	if (status)
413	goto out2;
414	status = init_coda_psdev();
415	if ( status ) {
416	printk("Problem (%d) in init_coda_psdev\n", status);
417	goto out1;
418	}
419
420	status = register_filesystem(&coda_fs_type);
421	if (status) {
422	printk("coda: failed to register filesystem!\n");
423	goto out;
424	}
425	return 0;
426	out:
427	for (i = 0; i < MAX_CODADEVS; i++) {
428	class_simple_device_remove(MKDEV(CODA_PSDEV_MAJOR, i));
429	devfs_remove("coda/%d", i);
430	}
431	class_simple_destroy(coda_psdev_class);
432	devfs_remove("coda");
433	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
434	coda_sysctl_clean();
435	out1:
436	coda_destroy_inodecache();
437	out2:
438	return status;
439	}
440
441	static void __exit exit_coda(void)
442	{
443	int err, i;
444
445	err = unregister_filesystem(&coda_fs_type);
446	if ( err != 0 ) {
447	printk("coda: failed to unregister filesystem\n");
448	}
449	for (i = 0; i < MAX_CODADEVS; i++) {
450	class_simple_device_remove(MKDEV(CODA_PSDEV_MAJOR, i));
451	devfs_remove("coda/%d", i);
452	}
453	class_simple_destroy(coda_psdev_class);
454	devfs_remove("coda");
455	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
456	coda_sysctl_clean();
457	coda_destroy_inodecache();
458	}
459
460	module_init(init_coda);
461	module_exit(exit_coda);
462