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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/block/bsg.c
....@@ -1,13 +1,6 @@
1
+// SPDX-License-Identifier: GPL-2.0
12 /*
23  * bsg.c - block layer implementation of the sg v4 interface
3
- *
4
- * Copyright (C) 2004 Jens Axboe <axboe@suse.de> SUSE Labs
5
- * Copyright (C) 2004 Peter M. Jones <pjones@redhat.com>
6
- *
7
- *  This file is subject to the terms and conditions of the GNU General Public
8
- *  License version 2.  See the file "COPYING" in the main directory of this
9
- *  archive for more details.
10
- *
114  */
125 #include <linux/module.h>
136 #include <linux/init.h>
....@@ -19,6 +12,7 @@
1912 #include <linux/idr.h>
2013 #include <linux/bsg.h>
2114 #include <linux/slab.h>
15
+#include <linux/pm_runtime.h>
2216 
2317 #include <scsi/scsi.h>
2418 #include <scsi/scsi_ioctl.h>
....@@ -74,6 +68,11 @@
7468 {
7569 	struct scsi_request *sreq = scsi_req(rq);
7670 
71
+	if (hdr->dout_xfer_len && hdr->din_xfer_len) {
72
+		pr_warn_once("BIDI support in bsg has been removed.\n");
73
+		return -EOPNOTSUPP;
74
+	}
75
+
7776 	sreq->cmd_len = hdr->request_len;
7877 	if (sreq->cmd_len > BLK_MAX_CDB) {
7978 		sreq->cmd = kzalloc(sreq->cmd_len, GFP_KERNEL);
....@@ -114,14 +113,10 @@
114113 			hdr->response_len = len;
115114 	}
116115 
117
-	if (rq->next_rq) {
118
-		hdr->dout_resid = sreq->resid_len;
119
-		hdr->din_resid = scsi_req(rq->next_rq)->resid_len;
120
-	} else if (rq_data_dir(rq) == READ) {
116
+	if (rq_data_dir(rq) == READ)
121117 		hdr->din_resid = sreq->resid_len;
122
-	} else {
118
+	else
123119 		hdr->dout_resid = sreq->resid_len;
124
-	}
125120 
126121 	return ret;
127122 }
....@@ -138,32 +133,37 @@
138133 	.free_rq		= bsg_scsi_free_rq,
139134 };
140135 
141
-static struct request *
142
-bsg_map_hdr(struct request_queue *q, struct sg_io_v4 *hdr, fmode_t mode)
136
+static int bsg_sg_io(struct request_queue *q, fmode_t mode, void __user *uarg)
143137 {
144
-	struct request *rq, *next_rq = NULL;
138
+	struct request *rq;
139
+	struct bio *bio;
140
+	struct sg_io_v4 hdr;
145141 	int ret;
146142 
143
+	if (copy_from_user(&hdr, uarg, sizeof(hdr)))
144
+		return -EFAULT;
145
+
147146 	if (!q->bsg_dev.class_dev)
148
-		return ERR_PTR(-ENXIO);
147
+		return -ENXIO;
149148 
150
-	if (hdr->guard != 'Q')
151
-		return ERR_PTR(-EINVAL);
152
-
153
-	ret = q->bsg_dev.ops->check_proto(hdr);
149
+	if (hdr.guard != 'Q')
150
+		return -EINVAL;
151
+	ret = q->bsg_dev.ops->check_proto(&hdr);
154152 	if (ret)
155
-		return ERR_PTR(ret);
153
+		return ret;
156154 
157
-	rq = blk_get_request(q, hdr->dout_xfer_len ?
155
+	rq = blk_get_request(q, hdr.dout_xfer_len ?
158156 			REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
159157 	if (IS_ERR(rq))
160
-		return rq;
158
+		return PTR_ERR(rq);
161159 
162
-	ret = q->bsg_dev.ops->fill_hdr(rq, hdr, mode);
163
-	if (ret)
164
-		goto out;
160
+	ret = q->bsg_dev.ops->fill_hdr(rq, &hdr, mode);
161
+	if (ret) {
162
+		blk_put_request(rq);
163
+		return ret;
164
+	}
165165 
166
-	rq->timeout = msecs_to_jiffies(hdr->timeout);
166
+	rq->timeout = msecs_to_jiffies(hdr.timeout);
167167 	if (!rq->timeout)
168168 		rq->timeout = q->sg_timeout;
169169 	if (!rq->timeout)
....@@ -171,64 +171,28 @@
171171 	if (rq->timeout < BLK_MIN_SG_TIMEOUT)
172172 		rq->timeout = BLK_MIN_SG_TIMEOUT;
173173 
174
-	if (hdr->dout_xfer_len && hdr->din_xfer_len) {
175
-		if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) {
176
-			ret = -EOPNOTSUPP;
177
-			goto out;
178
-		}
179
-
180
-		next_rq = blk_get_request(q, REQ_OP_SCSI_IN, 0);
181
-		if (IS_ERR(next_rq)) {
182
-			ret = PTR_ERR(next_rq);
183
-			goto out;
184
-		}
185
-
186
-		rq->next_rq = next_rq;
187
-		ret = blk_rq_map_user(q, next_rq, NULL, uptr64(hdr->din_xferp),
188
-				       hdr->din_xfer_len, GFP_KERNEL);
189
-		if (ret)
190
-			goto out_free_nextrq;
191
-	}
192
-
193
-	if (hdr->dout_xfer_len) {
194
-		ret = blk_rq_map_user(q, rq, NULL, uptr64(hdr->dout_xferp),
195
-				hdr->dout_xfer_len, GFP_KERNEL);
196
-	} else if (hdr->din_xfer_len) {
197
-		ret = blk_rq_map_user(q, rq, NULL, uptr64(hdr->din_xferp),
198
-				hdr->din_xfer_len, GFP_KERNEL);
174
+	if (hdr.dout_xfer_len) {
175
+		ret = blk_rq_map_user(q, rq, NULL, uptr64(hdr.dout_xferp),
176
+				hdr.dout_xfer_len, GFP_KERNEL);
177
+	} else if (hdr.din_xfer_len) {
178
+		ret = blk_rq_map_user(q, rq, NULL, uptr64(hdr.din_xferp),
179
+				hdr.din_xfer_len, GFP_KERNEL);
199180 	}
200181 
201182 	if (ret)
202
-		goto out_unmap_nextrq;
203
-	return rq;
183
+		goto out_free_rq;
204184 
205
-out_unmap_nextrq:
206
-	if (rq->next_rq)
207
-		blk_rq_unmap_user(rq->next_rq->bio);
208
-out_free_nextrq:
209
-	if (rq->next_rq)
210
-		blk_put_request(rq->next_rq);
211
-out:
212
-	q->bsg_dev.ops->free_rq(rq);
213
-	blk_put_request(rq);
214
-	return ERR_PTR(ret);
215
-}
185
+	bio = rq->bio;
216186 
217
-static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
218
-				    struct bio *bio, struct bio *bidi_bio)
219
-{
220
-	int ret;
221
-
222
-	ret = rq->q->bsg_dev.ops->complete_rq(rq, hdr);
223
-
224
-	if (rq->next_rq) {
225
-		blk_rq_unmap_user(bidi_bio);
226
-		blk_put_request(rq->next_rq);
227
-	}
228
-
187
+	blk_execute_rq(q, NULL, rq, !(hdr.flags & BSG_FLAG_Q_AT_TAIL));
188
+	ret = rq->q->bsg_dev.ops->complete_rq(rq, &hdr);
229189 	blk_rq_unmap_user(bio);
190
+
191
+out_free_rq:
230192 	rq->q->bsg_dev.ops->free_rq(rq);
231193 	blk_put_request(rq);
194
+	if (!ret && copy_to_user(uarg, &hdr, sizeof(hdr)))
195
+		return -EFAULT;
232196 	return ret;
233197 }
234198 
....@@ -345,12 +309,15 @@
345309 static int bsg_open(struct inode *inode, struct file *file)
346310 {
347311 	struct bsg_device *bd;
312
+	struct bsg_class_device *bcd;
348313 
349314 	bd = bsg_get_device(inode, file);
350315 
351316 	if (IS_ERR(bd))
352317 		return PTR_ERR(bd);
353318 
319
+	bcd = &bd->queue->bsg_dev;
320
+	pm_runtime_get_sync(bcd->class_dev->parent);
354321 	file->private_data = bd;
355322 	return 0;
356323 }
....@@ -358,36 +325,48 @@
358325 static int bsg_release(struct inode *inode, struct file *file)
359326 {
360327 	struct bsg_device *bd = file->private_data;
328
+	struct bsg_class_device *bcd;
361329 
362330 	file->private_data = NULL;
331
+
332
+	bcd = &bd->queue->bsg_dev;
333
+	pm_runtime_put_sync(bcd->class_dev->parent);
363334 	return bsg_put_device(bd);
335
+}
336
+
337
+static int bsg_get_command_q(struct bsg_device *bd, int __user *uarg)
338
+{
339
+	return put_user(bd->max_queue, uarg);
340
+}
341
+
342
+static int bsg_set_command_q(struct bsg_device *bd, int __user *uarg)
343
+{
344
+	int queue;
345
+
346
+	if (get_user(queue, uarg))
347
+		return -EFAULT;
348
+	if (queue < 1)
349
+		return -EINVAL;
350
+
351
+	spin_lock_irq(&bd->lock);
352
+	bd->max_queue = queue;
353
+	spin_unlock_irq(&bd->lock);
354
+	return 0;
364355 }
365356 
366357 static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
367358 {
368359 	struct bsg_device *bd = file->private_data;
369
-	int __user *uarg = (int __user *) arg;
370
-	int ret;
360
+	void __user *uarg = (void __user *) arg;
371361 
372362 	switch (cmd) {
373
-		/*
374
-		 * our own ioctls
375
-		 */
363
+	/*
364
+	 * Our own ioctls
365
+	 */
376366 	case SG_GET_COMMAND_Q:
377
-		return put_user(bd->max_queue, uarg);
378
-	case SG_SET_COMMAND_Q: {
379
-		int queue;
380
-
381
-		if (get_user(queue, uarg))
382
-			return -EFAULT;
383
-		if (queue < 1)
384
-			return -EINVAL;
385
-
386
-		spin_lock_irq(&bd->lock);
387
-		bd->max_queue = queue;
388
-		spin_unlock_irq(&bd->lock);
389
-		return 0;
390
-	}
367
+		return bsg_get_command_q(bd, uarg);
368
+	case SG_SET_COMMAND_Q:
369
+		return bsg_set_command_q(bd, uarg);
391370 
392371 	/*
393372 	 * SCSI/sg ioctls
....@@ -400,36 +379,13 @@
400379 	case SG_GET_RESERVED_SIZE:
401380 	case SG_SET_RESERVED_SIZE:
402381 	case SG_EMULATED_HOST:
403
-	case SCSI_IOCTL_SEND_COMMAND: {
404
-		void __user *uarg = (void __user *) arg;
405382 		return scsi_cmd_ioctl(bd->queue, NULL, file->f_mode, cmd, uarg);
406
-	}
407
-	case SG_IO: {
408
-		struct request *rq;
409
-		struct bio *bio, *bidi_bio = NULL;
410
-		struct sg_io_v4 hdr;
411
-		int at_head;
412
-
413
-		if (copy_from_user(&hdr, uarg, sizeof(hdr)))
414
-			return -EFAULT;
415
-
416
-		rq = bsg_map_hdr(bd->queue, &hdr, file->f_mode);
417
-		if (IS_ERR(rq))
418
-			return PTR_ERR(rq);
419
-
420
-		bio = rq->bio;
421
-		if (rq->next_rq)
422
-			bidi_bio = rq->next_rq->bio;
423
-
424
-		at_head = (0 == (hdr.flags & BSG_FLAG_Q_AT_TAIL));
425
-		blk_execute_rq(bd->queue, NULL, rq, at_head);
426
-		ret = blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio);
427
-
428
-		if (copy_to_user(uarg, &hdr, sizeof(hdr)))
429
-			return -EFAULT;
430
-
431
-		return ret;
432
-	}
383
+	case SG_IO:
384
+		return bsg_sg_io(bd->queue, file->f_mode, uarg);
385
+	case SCSI_IOCTL_SEND_COMMAND:
386
+		pr_warn_ratelimited("%s: calling unsupported SCSI_IOCTL_SEND_COMMAND\n",
387
+				current->comm);
388
+		return -EINVAL;
433389 	default:
434390 		return -ENOTTY;
435391 	}
....@@ -439,6 +395,7 @@
439395 	.open		=	bsg_open,
440396 	.release	=	bsg_release,
441397 	.unlocked_ioctl	=	bsg_ioctl,
398
+	.compat_ioctl	=	compat_ptr_ioctl,
442399 	.owner		=	THIS_MODULE,
443400 	.llseek		=	default_llseek,
444401 };
....@@ -471,7 +428,7 @@
471428 	/*
472429 	 * we need a proper transport to send commands, not a stacked device
473430 	 */
474
-	if (!queue_is_rq_based(q))
431
+	if (!queue_is_mq(q))
475432 		return 0;
476433 
477434 	bcd = &q->bsg_dev;