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2024-05-16 8d2a02b24d66aa359e83eebc1ed3c0f85367a1cb

 kernel/block/t10-pi.c
..
..
@@ -1,29 +1,13 @@
1
+// SPDX-License-Identifier: GPL-2.0
1
2
 /*
2
3
  * t10_pi.c - Functions for generating and verifying T10 Protection
3
4
  *	      Information.
4
- *
5
- * Copyright (C) 2007, 2008, 2014 Oracle Corporation
6
- * Written by: Martin K. Petersen <martin.petersen@oracle.com>
7
- *
8
- * This program is free software; you can redistribute it and/or
9
- * modify it under the terms of the GNU General Public License version
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- * 2 as published by the Free Software Foundation.
11
- *
12
- * This program is distributed in the hope that it will be useful, but
13
- * WITHOUT ANY WARRANTY; without even the implied warranty of
14
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
- * General Public License for more details.
16
- *
17
- * You should have received a copy of the GNU General Public License
18
- * along with this program; see the file COPYING.  If not, write to
19
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
20
- * USA.
21
- *
22
5
  */
23
6
 
24
7
 #include <linux/t10-pi.h>
25
8
 #include <linux/blkdev.h>
26
9
 #include <linux/crc-t10dif.h>
10
+#include <linux/module.h>
27
11
 #include <net/checksum.h>
28
12
 
29
13
 typedef __be16 (csum_fn) (void *, unsigned int);
..
..
@@ -44,7 +28,7 @@
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28
  * tag.
45
29
  */
46
30
 static blk_status_t t10_pi_generate(struct blk_integrity_iter *iter,
47
-		csum_fn *fn, unsigned int type)
31
+		csum_fn *fn, enum t10_dif_type type)
48
32
 {
49
33
 	unsigned int i;
50
34
 
..
..
@@ -54,7 +38,7 @@
54
38
 		pi->guard_tag = fn(iter->data_buf, iter->interval);
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39
 		pi->app_tag = 0;
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40
 
57
-		if (type == 1)
41
+		if (type == T10_PI_TYPE1_PROTECTION)
58
42
 			pi->ref_tag = cpu_to_be32(lower_32_bits(iter->seed));
59
43
 		else
60
44
 			pi->ref_tag = 0;
..
..
@@ -68,17 +52,18 @@
68
52
 }
69
53
 
70
54
 static blk_status_t t10_pi_verify(struct blk_integrity_iter *iter,
71
-		csum_fn *fn, unsigned int type)
55
+		csum_fn *fn, enum t10_dif_type type)
72
56
 {
73
57
 	unsigned int i;
58
+
59
+	BUG_ON(type == T10_PI_TYPE0_PROTECTION);
74
60
 
75
61
 	for (i = 0 ; i < iter->data_size ; i += iter->interval) {
76
62
 		struct t10_pi_tuple *pi = iter->prot_buf;
77
63
 		__be16 csum;
78
64
 
79
-		switch (type) {
80
-		case 1:
81
-		case 2:
65
+		if (type == T10_PI_TYPE1_PROTECTION ||
66
+		    type == T10_PI_TYPE2_PROTECTION) {
82
67
 			if (pi->app_tag == T10_PI_APP_ESCAPE)
83
68
 				goto next;
84
69
 
..
..
@@ -90,12 +75,10 @@
90
75
 				       iter->seed, be32_to_cpu(pi->ref_tag));
91
76
 				return BLK_STS_PROTECTION;
92
77
 			}
93
-			break;
94
-		case 3:
78
+		} else if (type == T10_PI_TYPE3_PROTECTION) {
95
79
 			if (pi->app_tag == T10_PI_APP_ESCAPE &&
96
80
 			    pi->ref_tag == T10_PI_REF_ESCAPE)
97
81
 				goto next;
98
-			break;
99
82
 		}
100
83
 
101
84
 		csum = fn(iter->data_buf, iter->interval);
..
..
@@ -119,93 +102,39 @@
119
102
 
120
103
 static blk_status_t t10_pi_type1_generate_crc(struct blk_integrity_iter *iter)
121
104
 {
122
-	return t10_pi_generate(iter, t10_pi_crc_fn, 1);
105
+	return t10_pi_generate(iter, t10_pi_crc_fn, T10_PI_TYPE1_PROTECTION);
123
106
 }
124
107
 
125
108
 static blk_status_t t10_pi_type1_generate_ip(struct blk_integrity_iter *iter)
126
109
 {
127
-	return t10_pi_generate(iter, t10_pi_ip_fn, 1);
110
+	return t10_pi_generate(iter, t10_pi_ip_fn, T10_PI_TYPE1_PROTECTION);
128
111
 }
129
112
 
130
113
 static blk_status_t t10_pi_type1_verify_crc(struct blk_integrity_iter *iter)
131
114
 {
132
-	return t10_pi_verify(iter, t10_pi_crc_fn, 1);
115
+	return t10_pi_verify(iter, t10_pi_crc_fn, T10_PI_TYPE1_PROTECTION);
133
116
 }
134
117
 
135
118
 static blk_status_t t10_pi_type1_verify_ip(struct blk_integrity_iter *iter)
136
119
 {
137
-	return t10_pi_verify(iter, t10_pi_ip_fn, 1);
120
+	return t10_pi_verify(iter, t10_pi_ip_fn, T10_PI_TYPE1_PROTECTION);
138
121
 }
139
-
140
-static blk_status_t t10_pi_type3_generate_crc(struct blk_integrity_iter *iter)
141
-{
142
-	return t10_pi_generate(iter, t10_pi_crc_fn, 3);
143
-}
144
-
145
-static blk_status_t t10_pi_type3_generate_ip(struct blk_integrity_iter *iter)
146
-{
147
-	return t10_pi_generate(iter, t10_pi_ip_fn, 3);
148
-}
149
-
150
-static blk_status_t t10_pi_type3_verify_crc(struct blk_integrity_iter *iter)
151
-{
152
-	return t10_pi_verify(iter, t10_pi_crc_fn, 3);
153
-}
154
-
155
-static blk_status_t t10_pi_type3_verify_ip(struct blk_integrity_iter *iter)
156
-{
157
-	return t10_pi_verify(iter, t10_pi_ip_fn, 3);
158
-}
159
-
160
-const struct blk_integrity_profile t10_pi_type1_crc = {
161
-	.name			= "T10-DIF-TYPE1-CRC",
162
-	.generate_fn		= t10_pi_type1_generate_crc,
163
-	.verify_fn		= t10_pi_type1_verify_crc,
164
-};
165
-EXPORT_SYMBOL(t10_pi_type1_crc);
166
-
167
-const struct blk_integrity_profile t10_pi_type1_ip = {
168
-	.name			= "T10-DIF-TYPE1-IP",
169
-	.generate_fn		= t10_pi_type1_generate_ip,
170
-	.verify_fn		= t10_pi_type1_verify_ip,
171
-};
172
-EXPORT_SYMBOL(t10_pi_type1_ip);
173
-
174
-const struct blk_integrity_profile t10_pi_type3_crc = {
175
-	.name			= "T10-DIF-TYPE3-CRC",
176
-	.generate_fn		= t10_pi_type3_generate_crc,
177
-	.verify_fn		= t10_pi_type3_verify_crc,
178
-};
179
-EXPORT_SYMBOL(t10_pi_type3_crc);
180
-
181
-const struct blk_integrity_profile t10_pi_type3_ip = {
182
-	.name			= "T10-DIF-TYPE3-IP",
183
-	.generate_fn		= t10_pi_type3_generate_ip,
184
-	.verify_fn		= t10_pi_type3_verify_ip,
185
-};
186
-EXPORT_SYMBOL(t10_pi_type3_ip);
187
122
 
188
123
 /**
189
- * t10_pi_prepare - prepare PI prior submitting request to device
124
+ * t10_pi_type1_prepare - prepare PI prior submitting request to device
190
125
  * @rq:              request with PI that should be prepared
191
- * @protection_type: PI type (Type 1/Type 2/Type 3)
192
126
  *
193
127
  * For Type 1/Type 2, the virtual start sector is the one that was
194
128
  * originally submitted by the block layer for the ref_tag usage. Due to
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129
  * partitioning, MD/DM cloning, etc. the actual physical start sector is
196
130
  * likely to be different. Remap protection information to match the
197
131
  * physical LBA.
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- *
199
- * Type 3 does not have a reference tag so no remapping is required.
200
132
  */
201
-void t10_pi_prepare(struct request *rq, u8 protection_type)
133
+static void t10_pi_type1_prepare(struct request *rq)
202
134
 {
203
135
 	const int tuple_sz = rq->q->integrity.tuple_size;
204
136
 	u32 ref_tag = t10_pi_ref_tag(rq);
205
137
 	struct bio *bio;
206
-
207
-	if (protection_type == T10_PI_TYPE3_PROTECTION)
208
-		return;
209
138
 
210
139
 	__rq_for_each_bio(bio, rq) {
211
140
 		struct bio_integrity_payload *bip = bio_integrity(bio);
..
..
@@ -239,13 +168,11 @@
239
168
 		bip->bip_flags |= BIP_MAPPED_INTEGRITY;
240
169
 	}
241
170
 }
242
-EXPORT_SYMBOL(t10_pi_prepare);
243
171
 
244
172
 /**
245
- * t10_pi_complete - prepare PI prior returning request to the block layer
173
+ * t10_pi_type1_complete - prepare PI prior returning request to the blk layer
246
174
  * @rq:              request with PI that should be prepared
247
- * @protection_type: PI type (Type 1/Type 2/Type 3)
248
- * @intervals:       total elements to prepare
175
+ * @nr_bytes:        total bytes to prepare
249
176
  *
250
177
  * For Type 1/Type 2, the virtual start sector is the one that was
251
178
  * originally submitted by the block layer for the ref_tag usage. Due to
..
..
@@ -253,18 +180,13 @@
253
180
  * likely to be different. Since the physical start sector was submitted
254
181
  * to the device, we should remap it back to virtual values expected by the
255
182
  * block layer.
256
- *
257
- * Type 3 does not have a reference tag so no remapping is required.
258
183
  */
259
-void t10_pi_complete(struct request *rq, u8 protection_type,
260
-		     unsigned int intervals)
184
+static void t10_pi_type1_complete(struct request *rq, unsigned int nr_bytes)
261
185
 {
186
+	unsigned intervals = nr_bytes >> rq->q->integrity.interval_exp;
262
187
 	const int tuple_sz = rq->q->integrity.tuple_size;
263
188
 	u32 ref_tag = t10_pi_ref_tag(rq);
264
189
 	struct bio *bio;
265
-
266
-	if (protection_type == T10_PI_TYPE3_PROTECTION)
267
-		return;
268
190
 
269
191
 	__rq_for_each_bio(bio, rq) {
270
192
 		struct bio_integrity_payload *bip = bio_integrity(bio);
..
..
@@ -293,4 +215,71 @@
293
215
 		}
294
216
 	}
295
217
 }
296
-EXPORT_SYMBOL(t10_pi_complete);
218
+
219
+static blk_status_t t10_pi_type3_generate_crc(struct blk_integrity_iter *iter)
220
+{
221
+	return t10_pi_generate(iter, t10_pi_crc_fn, T10_PI_TYPE3_PROTECTION);
222
+}
223
+
224
+static blk_status_t t10_pi_type3_generate_ip(struct blk_integrity_iter *iter)
225
+{
226
+	return t10_pi_generate(iter, t10_pi_ip_fn, T10_PI_TYPE3_PROTECTION);
227
+}
228
+
229
+static blk_status_t t10_pi_type3_verify_crc(struct blk_integrity_iter *iter)
230
+{
231
+	return t10_pi_verify(iter, t10_pi_crc_fn, T10_PI_TYPE3_PROTECTION);
232
+}
233
+
234
+static blk_status_t t10_pi_type3_verify_ip(struct blk_integrity_iter *iter)
235
+{
236
+	return t10_pi_verify(iter, t10_pi_ip_fn, T10_PI_TYPE3_PROTECTION);
237
+}
238
+
239
+/* Type 3 does not have a reference tag so no remapping is required. */
240
+static void t10_pi_type3_prepare(struct request *rq)
241
+{
242
+}
243
+
244
+/* Type 3 does not have a reference tag so no remapping is required. */
245
+static void t10_pi_type3_complete(struct request *rq, unsigned int nr_bytes)
246
+{
247
+}
248
+
249
+const struct blk_integrity_profile t10_pi_type1_crc = {
250
+	.name			= "T10-DIF-TYPE1-CRC",
251
+	.generate_fn		= t10_pi_type1_generate_crc,
252
+	.verify_fn		= t10_pi_type1_verify_crc,
253
+	.prepare_fn		= t10_pi_type1_prepare,
254
+	.complete_fn		= t10_pi_type1_complete,
255
+};
256
+EXPORT_SYMBOL(t10_pi_type1_crc);
257
+
258
+const struct blk_integrity_profile t10_pi_type1_ip = {
259
+	.name			= "T10-DIF-TYPE1-IP",
260
+	.generate_fn		= t10_pi_type1_generate_ip,
261
+	.verify_fn		= t10_pi_type1_verify_ip,
262
+	.prepare_fn		= t10_pi_type1_prepare,
263
+	.complete_fn		= t10_pi_type1_complete,
264
+};
265
+EXPORT_SYMBOL(t10_pi_type1_ip);
266
+
267
+const struct blk_integrity_profile t10_pi_type3_crc = {
268
+	.name			= "T10-DIF-TYPE3-CRC",
269
+	.generate_fn		= t10_pi_type3_generate_crc,
270
+	.verify_fn		= t10_pi_type3_verify_crc,
271
+	.prepare_fn		= t10_pi_type3_prepare,
272
+	.complete_fn		= t10_pi_type3_complete,
273
+};
274
+EXPORT_SYMBOL(t10_pi_type3_crc);
275
+
276
+const struct blk_integrity_profile t10_pi_type3_ip = {
277
+	.name			= "T10-DIF-TYPE3-IP",
278
+	.generate_fn		= t10_pi_type3_generate_ip,
279
+	.verify_fn		= t10_pi_type3_verify_ip,
280
+	.prepare_fn		= t10_pi_type3_prepare,
281
+	.complete_fn		= t10_pi_type3_complete,
282
+};
283
+EXPORT_SYMBOL(t10_pi_type3_ip);
284
+
285
+MODULE_LICENSE("GPL");