[mirror_ubuntu-bionic-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 <asm/poll.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 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) ) {
			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);
			if (!outp->fh)
				return -EBADF;
		}
	}

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

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

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

	if (nbytes == 0)
		return 0;

	mutex_lock(&vcp->vc_mutex);

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

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

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

	if (retval)
		goto out;

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

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

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

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

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

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

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

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

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

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

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

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

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


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

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

	mutex_lock(&vcp->vc_mutex);

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

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

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

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

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


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

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

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

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

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

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

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

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

module_init(init_coda);
module_exit(exit_coda);
Commit	Line	Data
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>
1da177e4	42	#include <asm/poll.h>
834b46c3	43	#include <linux/uaccess.h>
1da177e4 LT	44
1da177e4 LT	45	#include <linux/coda.h>
1da177e4	46	#include <linux/coda_psdev.h>
1da177e4	47
31a203df AV	48	#include "coda_linux.h"
31a203df AV	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);
da47c19e	70	mutex_lock(&vcp->vc_mutex);
1da177e4 LT	71	if (!list_empty(&vcp->vc_pending))
1da177e4 LT	72	mask \|= POLLIN \| POLLRDNORM;
da47c19e	73	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	74
	75	return mask;
	76	}
	77
97718390	78	static long coda_psdev_ioctl(struct file * filp, unsigned int cmd, unsigned long arg)
1da177e4 LT	79	{
	80	unsigned int data;
	81
	82	switch(cmd) {
	83	case CIOC_KERNEL_VERSION:
	84	data = CODA_KERNEL_VERSION;
	85	return put_user(data, (int __user *) arg);
	86	default:
	87	return -ENOTTY;
	88	}
	89
	90	return 0;
	91	}
	92
	93	/*
	94	* Receive a message written by Venus to the psdev
	95	*/
	96
	97	static ssize_t coda_psdev_write(struct file file, const char __user buf,
	98	size_t nbytes, loff_t *off)
	99	{
	100	struct venus_comm vcp = (struct venus_comm ) file->private_data;
	101	struct upc_req *req = NULL;
	102	struct upc_req *tmp;
	103	struct list_head *lh;
	104	struct coda_in_hdr hdr;
	105	ssize_t retval = 0, count = 0;
	106	int error;
	107
	108	/* Peek at the opcode, uniquefier */
	109	if (copy_from_user(&hdr, buf, 2 * sizeof(u_long)))
	110	return -EFAULT;
	111
	112	if (DOWNCALL(hdr.opcode)) {
f7cc02b8	113	union outputArgs *dcbuf;
1da177e4 LT	114	int size = sizeof(*dcbuf);
1da177e4 LT	115
1da177e4	116	if ( nbytes < sizeof(struct coda_out_hdr) ) {
d9b4b319 FF	117	pr_warn("coda_downcall opc %d uniq %d, not enough!\n",
d9b4b319 FF	118	hdr.opcode, hdr.unique);
1da177e4 LT	119	count = nbytes;
	120	goto out;
	121	}
	122	if ( nbytes > size ) {
f38cfb25	123	pr_warn("downcall opc %d, uniq %d, too much!",
d9b4b319	124	hdr.opcode, hdr.unique);
1da177e4 LT	125	nbytes = size;
	126	}
	127	CODA_ALLOC(dcbuf, union outputArgs *, nbytes);
	128	if (copy_from_user(dcbuf, buf, nbytes)) {
	129	CODA_FREE(dcbuf, nbytes);
	130	retval = -EFAULT;
	131	goto out;
	132	}
	133
	134	/* what downcall errors does Venus handle ? */
f7cc02b8	135	error = coda_downcall(vcp, hdr.opcode, dcbuf);
1da177e4 LT	136
	137	CODA_FREE(dcbuf, nbytes);
	138	if (error) {
6d6bd94f FF	139	pr_warn("%s: coda_downcall error: %d\n",
6d6bd94f FF	140	__func__, error);
1da177e4 LT	141	retval = error;
	142	goto out;
	143	}
	144	count = nbytes;
	145	goto out;
	146	}
	147
	148	/* Look for the message on the processing queue. */
da47c19e	149	mutex_lock(&vcp->vc_mutex);
1da177e4 LT	150	list_for_each(lh, &vcp->vc_processing) {
	151	tmp = list_entry(lh, struct upc_req , uc_chain);
	152	if (tmp->uc_unique == hdr.unique) {
	153	req = tmp;
	154	list_del(&req->uc_chain);
	155	break;
	156	}
	157	}
da47c19e	158	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	159
1da177e4 LT	160	if (!req) {
6d6bd94f FF	161	pr_warn("%s: msg (%d, %d) not found\n",
6d6bd94f FF	162	__func__, hdr.opcode, hdr.unique);
1da177e4 LT	163	retval = -ESRCH;
	164	goto out;
	165	}
	166
	167	/* move data into response buffer. */
	168	if (req->uc_outSize < nbytes) {
6d6bd94f FF	169	pr_warn("%s: too much cnt: %d, cnt: %ld, opc: %d, uniq: %d.\n",
	170	__func__, req->uc_outSize, (long)nbytes,
	171	hdr.opcode, hdr.unique);
1da177e4 LT	172	nbytes = req->uc_outSize; /* don't have more space! */
	173	}
	174	if (copy_from_user(req->uc_data, buf, nbytes)) {
4aeefdc6	175	req->uc_flags \|= CODA_REQ_ABORT;
1da177e4 LT	176	wake_up(&req->uc_sleep);
	177	retval = -EFAULT;
	178	goto out;
	179	}
	180
	181	/* adjust outsize. is this useful ?? */
112d421d JH	182	req->uc_outSize = nbytes;
112d421d JH	183	req->uc_flags \|= CODA_REQ_WRITE;
1da177e4 LT	184	count = nbytes;
	185
	186	/* Convert filedescriptor into a file handle */
	187	if (req->uc_opcode == CODA_OPEN_BY_FD) {
	188	struct coda_open_by_fd_out *outp =
	189	(struct coda_open_by_fd_out *)req->uc_data;
78fc8681	190	if (!outp->oh.result) {
38c2e437	191	outp->fh = fget(outp->fd);
78fc8681 ZJ	192	if (!outp->fh)
	193	return -EBADF;
	194	}
1da177e4 LT	195	}
	196
	197	wake_up(&req->uc_sleep);
	198	out:
	199	return(count ? count : retval);
	200	}
	201
	202	/*
	203	* Read a message from the kernel to Venus
	204	*/
	205
	206	static ssize_t coda_psdev_read(struct file * file, char __user * buf,
	207	size_t nbytes, loff_t *off)
	208	{
	209	DECLARE_WAITQUEUE(wait, current);
	210	struct venus_comm vcp = (struct venus_comm ) file->private_data;
	211	struct upc_req *req;
	212	ssize_t retval = 0, count = 0;
	213
	214	if (nbytes == 0)
	215	return 0;
	216
da47c19e	217	mutex_lock(&vcp->vc_mutex);
1da177e4 LT	218
	219	add_wait_queue(&vcp->vc_waitq, &wait);
	220	set_current_state(TASK_INTERRUPTIBLE);
	221
	222	while (list_empty(&vcp->vc_pending)) {
	223	if (file->f_flags & O_NONBLOCK) {
	224	retval = -EAGAIN;
	225	break;
	226	}
	227	if (signal_pending(current)) {
	228	retval = -ERESTARTSYS;
	229	break;
	230	}
da47c19e	231	mutex_unlock(&vcp->vc_mutex);
1da177e4	232	schedule();
da47c19e	233	mutex_lock(&vcp->vc_mutex);
1da177e4 LT	234	}
	235
	236	set_current_state(TASK_RUNNING);
	237	remove_wait_queue(&vcp->vc_waitq, &wait);
	238
	239	if (retval)
	240	goto out;
	241
	242	req = list_entry(vcp->vc_pending.next, struct upc_req,uc_chain);
	243	list_del(&req->uc_chain);
	244
	245	/* Move the input args into userspace */
	246	count = req->uc_inSize;
	247	if (nbytes < req->uc_inSize) {
6d6bd94f FF	248	pr_warn("%s: Venus read %ld bytes of %d in message\n",
6d6bd94f FF	249	__func__, (long)nbytes, req->uc_inSize);
1da177e4 LT	250	count = nbytes;
	251	}
	252
	253	if (copy_to_user(buf, req->uc_data, count))
	254	retval = -EFAULT;
	255
	256	/* If request was not a signal, enqueue and don't free */
4aeefdc6 JA	257	if (!(req->uc_flags & CODA_REQ_ASYNC)) {
4aeefdc6 JA	258	req->uc_flags \|= CODA_REQ_READ;
8e13059a	259	list_add_tail(&(req->uc_chain), &vcp->vc_processing);
1da177e4 LT	260	goto out;
	261	}
	262
	263	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
37461e19	264	kfree(req);
1da177e4	265	out:
da47c19e	266	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	267	return (count ? count : retval);
	268	}
	269
	270	static int coda_psdev_open(struct inode * inode, struct file * file)
	271	{
87065519 JH	272	struct venus_comm *vcp;
87065519 JH	273	int idx, err;
1da177e4	274
9fd973e0 EB	275	if (task_active_pid_ns(current) != &init_pid_ns)
	276	return -EINVAL;
	277
d83f5901 EB	278	if (current_user_ns() != &init_user_ns)
	279	return -EINVAL;
	280
1da177e4	281	idx = iminor(inode);
87065519	282	if (idx < 0 \|\| idx >= MAX_CODADEVS)
1da177e4	283	return -ENODEV;
1da177e4	284
87065519	285	err = -EBUSY;
1da177e4	286	vcp = &coda_comms[idx];
da47c19e YA	287	mutex_lock(&vcp->vc_mutex);
da47c19e YA	288
87065519 JH	289	if (!vcp->vc_inuse) {
	290	vcp->vc_inuse++;
	291
1da177e4 LT	292	INIT_LIST_HEAD(&vcp->vc_pending);
	293	INIT_LIST_HEAD(&vcp->vc_processing);
	294	init_waitqueue_head(&vcp->vc_waitq);
	295	vcp->vc_sb = NULL;
	296	vcp->vc_seq = 0;
87065519 JH	297
	298	file->private_data = vcp;
	299	err = 0;
1da177e4	300	}
1da177e4	301
da47c19e	302	mutex_unlock(&vcp->vc_mutex);
87065519	303	return err;
1da177e4 LT	304	}
	305
	306
	307	static int coda_psdev_release(struct inode * inode, struct file * file)
	308	{
87065519 JH	309	struct venus_comm vcp = (struct venus_comm ) file->private_data;
87065519 JH	310	struct upc_req req, tmp;
1da177e4	311
87065519	312	if (!vcp \|\| !vcp->vc_inuse ) {
6d6bd94f	313	pr_warn("%s: Not open.\n", __func__);
1da177e4 LT	314	return -1;
	315	}
	316
da47c19e	317	mutex_lock(&vcp->vc_mutex);
87065519 JH	318
87065519 JH	319	/* Wakeup clients so they can return. */
1da177e4	320	list_for_each_entry_safe(req, tmp, &vcp->vc_pending, uc_chain) {
87065519 JH	321	list_del(&req->uc_chain);
87065519 JH	322
1da177e4	323	/* Async requests need to be freed here */
4aeefdc6	324	if (req->uc_flags & CODA_REQ_ASYNC) {
1da177e4	325	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
37461e19	326	kfree(req);
1da177e4 LT	327	continue;
1da177e4 LT	328	}
4aeefdc6	329	req->uc_flags \|= CODA_REQ_ABORT;
1da177e4	330	wake_up(&req->uc_sleep);
87065519 JH	331	}
	332
	333	list_for_each_entry_safe(req, tmp, &vcp->vc_processing, uc_chain) {
	334	list_del(&req->uc_chain);
	335
4aeefdc6	336	req->uc_flags \|= CODA_REQ_ABORT;
87065519 JH	337	wake_up(&req->uc_sleep);
87065519 JH	338	}
1da177e4	339
87065519 JH	340	file->private_data = NULL;
87065519 JH	341	vcp->vc_inuse--;
da47c19e	342	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	343	return 0;
	344	}
	345
	346
4b6f5d20	347	static const struct file_operations coda_psdev_fops = {
1da177e4 LT	348	.owner = THIS_MODULE,
	349	.read = coda_psdev_read,
	350	.write = coda_psdev_write,
	351	.poll = coda_psdev_poll,
97718390	352	.unlocked_ioctl = coda_psdev_ioctl,
1da177e4 LT	353	.open = coda_psdev_open,
1da177e4 LT	354	.release = coda_psdev_release,
6038f373	355	.llseek = noop_llseek,
1da177e4 LT	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)) {
6d6bd94f FF	362	pr_err("%s: unable to get major %d\n",
6d6bd94f FF	363	__func__, CODA_PSDEV_MAJOR);
1da177e4 LT	364	return -EIO;
1da177e4 LT	365	}
1db560af	366	coda_psdev_class = class_create(THIS_MODULE, "coda");
1da177e4 LT	367	if (IS_ERR(coda_psdev_class)) {
	368	err = PTR_ERR(coda_psdev_class);
	369	goto out_chrdev;
	370	}
da47c19e YA	371	for (i = 0; i < MAX_CODADEVS; i++) {
da47c19e YA	372	mutex_init(&(&coda_comms[i])->vc_mutex);
a9b12619 GKH	373	device_create(coda_psdev_class, NULL,
a9b12619 GKH	374	MKDEV(CODA_PSDEV_MAJOR, i), NULL, "cfs%d", i);
da47c19e	375	}
1da177e4 LT	376	coda_sysctl_init();
	377	goto out;
	378
1da177e4 LT	379	out_chrdev:
	380	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	381	out:
	382	return err;
	383	}
	384
5b7f13bd JH	385	MODULE_AUTHOR("Jan Harkes, Peter J. Braam");
	386	MODULE_DESCRIPTION("Coda Distributed File System VFS interface");
	387	MODULE_ALIAS_CHARDEV_MAJOR(CODA_PSDEV_MAJOR);
1da177e4	388	MODULE_LICENSE("GPL");
5b7f13bd	389	MODULE_VERSION("6.6");
1da177e4	390
1da177e4 LT	391	static int __init init_coda(void)
	392	{
	393	int status;
	394	int i;
1da177e4 LT	395
	396	status = coda_init_inodecache();
	397	if (status)
	398	goto out2;
	399	status = init_coda_psdev();
	400	if ( status ) {
d9b4b319	401	pr_warn("Problem (%d) in init_coda_psdev\n", status);
1da177e4 LT	402	goto out1;
	403	}
	404
	405	status = register_filesystem(&coda_fs_type);
	406	if (status) {
f38cfb25	407	pr_warn("failed to register filesystem!\n");
1da177e4 LT	408	goto out;
	409	}
	410	return 0;
	411	out:
8ab5e4c1	412	for (i = 0; i < MAX_CODADEVS; i++)
62ca8792	413	device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
1db560af	414	class_destroy(coda_psdev_class);
1da177e4 LT	415	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	416	coda_sysctl_clean();
	417	out1:
	418	coda_destroy_inodecache();
	419	out2:
	420	return status;
	421	}
	422
	423	static void __exit exit_coda(void)
	424	{
	425	int err, i;
	426
	427	err = unregister_filesystem(&coda_fs_type);
d9b4b319	428	if (err != 0)
f38cfb25	429	pr_warn("failed to unregister filesystem\n");
8ab5e4c1	430	for (i = 0; i < MAX_CODADEVS; i++)
62ca8792	431	device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
1db560af	432	class_destroy(coda_psdev_class);
1da177e4 LT	433	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	434	coda_sysctl_clean();
	435	coda_destroy_inodecache();
	436	}
	437
	438	module_init(init_coda);
	439	module_exit(exit_coda);
	440