1 // SPDX-License-Identifier: GPL-2.0-or-later
8  *              Adapted to become the Linux 2.0 Coda pseudo device
13  *              Copyright (c) 1997 Carnegie-Mellon University
35 #include <linux/device.h>
55  * Device operations
60         struct venus_comm *vcp = (struct venus_comm *) file->private_data;  in coda_psdev_poll()
63 	poll_wait(file, &vcp->vc_waitq, wait);  in coda_psdev_poll()
64 	mutex_lock(&vcp->vc_mutex);  in coda_psdev_poll()
65 	if (!list_empty(&vcp->vc_pending))  in coda_psdev_poll()
67 	mutex_unlock(&vcp->vc_mutex);  in coda_psdev_poll()
81 		return -ENOTTY;  in coda_psdev_ioctl()
94         struct venus_comm *vcp = (struct venus_comm *) file->private_data;  in coda_psdev_write()
102 	/* make sure there is enough to copy out the (opcode, unique) values */  in coda_psdev_write()
104 		return -EINVAL;  in coda_psdev_write()
108 	        return -EFAULT;  in coda_psdev_write()
116 				hdr.opcode, hdr.unique);  in coda_psdev_write()
122 				hdr.opcode, hdr.unique);  in coda_psdev_write()
147 	mutex_lock(&vcp->vc_mutex);  in coda_psdev_write()
148 	list_for_each(lh, &vcp->vc_processing) {  in coda_psdev_write()
150 		if (tmp->uc_unique == hdr.unique) {  in coda_psdev_write()
152 			list_del(&req->uc_chain);  in coda_psdev_write()
156 	mutex_unlock(&vcp->vc_mutex);  in coda_psdev_write()
160 			__func__, hdr.opcode, hdr.unique);  in coda_psdev_write()
161 		retval = -ESRCH;  in coda_psdev_write()
166 	if (req->uc_outSize < nbytes) {  in coda_psdev_write()
168 			__func__, req->uc_outSize, (long)nbytes,  in coda_psdev_write()
169 			hdr.opcode, hdr.unique);  in coda_psdev_write()
170 		nbytes = req->uc_outSize; /* don't have more space! */  in coda_psdev_write()
172         if (copy_from_user(req->uc_data, buf, nbytes)) {  in coda_psdev_write()
173 		req->uc_flags |= CODA_REQ_ABORT;  in coda_psdev_write()
174 		wake_up(&req->uc_sleep);  in coda_psdev_write()
175 		retval = -EFAULT;  in coda_psdev_write()
180 	req->uc_outSize = nbytes;  in coda_psdev_write()
181 	req->uc_flags |= CODA_REQ_WRITE;  in coda_psdev_write()
185 	if (req->uc_opcode == CODA_OPEN_BY_FD) {  in coda_psdev_write()
187 			(struct coda_open_by_fd_out *)req->uc_data;  in coda_psdev_write()
188 		if (!outp->oh.result) {  in coda_psdev_write()
189 			outp->fh = fget(outp->fd);  in coda_psdev_write()
190 			if (!outp->fh)  in coda_psdev_write()
191 				return -EBADF;  in coda_psdev_write()
195         wake_up(&req->uc_sleep);  in coda_psdev_write()
208         struct venus_comm *vcp = (struct venus_comm *) file->private_data;  in coda_psdev_read()
215 	mutex_lock(&vcp->vc_mutex);  in coda_psdev_read()
217 	add_wait_queue(&vcp->vc_waitq, &wait);  in coda_psdev_read()
220 	while (list_empty(&vcp->vc_pending)) {  in coda_psdev_read()
221 		if (file->f_flags & O_NONBLOCK) {  in coda_psdev_read()
222 			retval = -EAGAIN;  in coda_psdev_read()
226 			retval = -ERESTARTSYS;  in coda_psdev_read()
229 		mutex_unlock(&vcp->vc_mutex);  in coda_psdev_read()
231 		mutex_lock(&vcp->vc_mutex);  in coda_psdev_read()
235 	remove_wait_queue(&vcp->vc_waitq, &wait);  in coda_psdev_read()
240 	req = list_entry(vcp->vc_pending.next, struct upc_req,uc_chain);  in coda_psdev_read()
241 	list_del(&req->uc_chain);  in coda_psdev_read()
244 	count = req->uc_inSize;  in coda_psdev_read()
245 	if (nbytes < req->uc_inSize) {  in coda_psdev_read()
247 			__func__, (long)nbytes, req->uc_inSize);  in coda_psdev_read()
251 	if (copy_to_user(buf, req->uc_data, count))  in coda_psdev_read()
252 	        retval = -EFAULT;  in coda_psdev_read()
255 	if (!(req->uc_flags & CODA_REQ_ASYNC)) {  in coda_psdev_read()
256 		req->uc_flags |= CODA_REQ_READ;  in coda_psdev_read()
257 		list_add_tail(&(req->uc_chain), &vcp->vc_processing);  in coda_psdev_read()
261 	kvfree(req->uc_data);  in coda_psdev_read()
264 	mutex_unlock(&vcp->vc_mutex);  in coda_psdev_read()
274 		return -EINVAL;  in coda_psdev_open()
277 		return -EINVAL;  in coda_psdev_open()
281 		return -ENODEV;  in coda_psdev_open()
283 	err = -EBUSY;  in coda_psdev_open()
285 	mutex_lock(&vcp->vc_mutex);  in coda_psdev_open()
287 	if (!vcp->vc_inuse) {  in coda_psdev_open()
288 		vcp->vc_inuse++;  in coda_psdev_open()
290 		INIT_LIST_HEAD(&vcp->vc_pending);  in coda_psdev_open()
291 		INIT_LIST_HEAD(&vcp->vc_processing);  in coda_psdev_open()
292 		init_waitqueue_head(&vcp->vc_waitq);  in coda_psdev_open()
293 		vcp->vc_sb = NULL;  in coda_psdev_open()
294 		vcp->vc_seq = 0;  in coda_psdev_open()
296 		file->private_data = vcp;  in coda_psdev_open()
300 	mutex_unlock(&vcp->vc_mutex);  in coda_psdev_open()
307 	struct venus_comm *vcp = (struct venus_comm *) file->private_data;  in coda_psdev_release()
310 	if (!vcp || !vcp->vc_inuse ) {  in coda_psdev_release()
312 		return -1;  in coda_psdev_release()
315 	mutex_lock(&vcp->vc_mutex);  in coda_psdev_release()
318 	list_for_each_entry_safe(req, tmp, &vcp->vc_pending, uc_chain) {  in coda_psdev_release()
319 		list_del(&req->uc_chain);  in coda_psdev_release()
322 		if (req->uc_flags & CODA_REQ_ASYNC) {  in coda_psdev_release()
323 			kvfree(req->uc_data);  in coda_psdev_release()
327 		req->uc_flags |= CODA_REQ_ABORT;  in coda_psdev_release()
328 		wake_up(&req->uc_sleep);  in coda_psdev_release()
331 	list_for_each_entry_safe(req, tmp, &vcp->vc_processing, uc_chain) {  in coda_psdev_release()
332 		list_del(&req->uc_chain);  in coda_psdev_release()
334 		req->uc_flags |= CODA_REQ_ABORT;  in coda_psdev_release()
335 		wake_up(&req->uc_sleep);  in coda_psdev_release()
338 	file->private_data = NULL;  in coda_psdev_release()
339 	vcp->vc_inuse--;  in coda_psdev_release()
340 	mutex_unlock(&vcp->vc_mutex);  in coda_psdev_release()
362 		return -EIO;  in init_coda_psdev()
370 		mutex_init(&(&coda_comms[i])->vc_mutex);  in init_coda_psdev()