Commit | Line | Data |
---|---|---|
4d05a28d KRW |
1 | /* |
2 | * This program is free software; you can redistribute it and/or | |
3 | * modify it under the terms of the GNU General Public License version 2 | |
4 | * as published by the Free Software Foundation; or, when distributed | |
5 | * separately from the Linux kernel or incorporated into other | |
6 | * software packages, subject to the following license: | |
7 | * | |
8 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
9 | * of this source file (the "Software"), to deal in the Software without | |
10 | * restriction, including without limitation the rights to use, copy, modify, | |
11 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
12 | * and to permit persons to whom the Software is furnished to do so, subject to | |
13 | * the following conditions: | |
14 | * | |
15 | * The above copyright notice and this permission notice shall be included in | |
16 | * all copies or substantial portions of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
21 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
23 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
24 | * IN THE SOFTWARE. | |
25 | */ | |
26 | ||
5a577e38 KRW |
27 | #ifndef __XEN_BLKIF__BACKEND__COMMON_H__ |
28 | #define __XEN_BLKIF__BACKEND__COMMON_H__ | |
4d05a28d | 29 | |
4d05a28d KRW |
30 | #include <linux/module.h> |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/blkdev.h> | |
34 | #include <linux/vmalloc.h> | |
35 | #include <linux/wait.h> | |
5489377c | 36 | #include <linux/io.h> |
0a8704a5 | 37 | #include <linux/rbtree.h> |
4d05a28d KRW |
38 | #include <asm/setup.h> |
39 | #include <asm/pgalloc.h> | |
4d05a28d | 40 | #include <asm/hypervisor.h> |
88122933 | 41 | #include <xen/grant_table.h> |
4d05a28d | 42 | #include <xen/xenbus.h> |
452a6b2b KRW |
43 | #include <xen/interface/io/ring.h> |
44 | #include <xen/interface/io/blkif.h> | |
45 | #include <xen/interface/io/protocols.h> | |
4d05a28d | 46 | |
22b20f2d | 47 | #define DRV_PFX "xen-blkback:" |
1afbd730 | 48 | #define DPRINTK(fmt, args...) \ |
1bc05b0a | 49 | pr_debug(DRV_PFX "(%s:%d) " fmt ".\n", \ |
1afbd730 | 50 | __func__, __LINE__, ##args) |
4d05a28d | 51 | |
452a6b2b | 52 | |
402b27f9 RPM |
53 | /* |
54 | * This is the maximum number of segments that would be allowed in indirect | |
55 | * requests. This value will also be passed to the frontend. | |
56 | */ | |
57 | #define MAX_INDIRECT_SEGMENTS 256 | |
58 | ||
59 | #define SEGS_PER_INDIRECT_FRAME \ | |
80bfa2f6 | 60 | (PAGE_SIZE/sizeof(struct blkif_request_segment)) |
402b27f9 RPM |
61 | #define MAX_INDIRECT_PAGES \ |
62 | ((MAX_INDIRECT_SEGMENTS + SEGS_PER_INDIRECT_FRAME - 1)/SEGS_PER_INDIRECT_FRAME) | |
63 | #define INDIRECT_PAGES(_segs) \ | |
64 | ((_segs + SEGS_PER_INDIRECT_FRAME - 1)/SEGS_PER_INDIRECT_FRAME) | |
65 | ||
452a6b2b KRW |
66 | /* Not a real protocol. Used to generate ring structs which contain |
67 | * the elements common to all protocols only. This way we get a | |
68 | * compiler-checkable way to use common struct elements, so we can | |
69 | * avoid using switch(protocol) in a number of places. */ | |
70 | struct blkif_common_request { | |
71 | char dummy; | |
72 | }; | |
73 | struct blkif_common_response { | |
74 | char dummy; | |
75 | }; | |
76 | ||
b3cb0d6a | 77 | struct blkif_x86_32_request_rw { |
97e36834 KRW |
78 | uint8_t nr_segments; /* number of segments */ |
79 | blkif_vdev_t handle; /* only for read/write requests */ | |
80 | uint64_t id; /* private guest value, echoed in resp */ | |
b3cb0d6a LD |
81 | blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ |
82 | struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST]; | |
97e36834 | 83 | } __attribute__((__packed__)); |
b3cb0d6a LD |
84 | |
85 | struct blkif_x86_32_request_discard { | |
5ea42986 | 86 | uint8_t flag; /* BLKIF_DISCARD_SECURE or zero */ |
97e36834 KRW |
87 | blkif_vdev_t _pad1; /* was "handle" for read/write requests */ |
88 | uint64_t id; /* private guest value, echoed in resp */ | |
b3cb0d6a | 89 | blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ |
97e36834 KRW |
90 | uint64_t nr_sectors; |
91 | } __attribute__((__packed__)); | |
b3cb0d6a | 92 | |
0e367ae4 DV |
93 | struct blkif_x86_32_request_other { |
94 | uint8_t _pad1; | |
95 | blkif_vdev_t _pad2; | |
96 | uint64_t id; /* private guest value, echoed in resp */ | |
97 | } __attribute__((__packed__)); | |
98 | ||
402b27f9 RPM |
99 | struct blkif_x86_32_request_indirect { |
100 | uint8_t indirect_op; | |
101 | uint16_t nr_segments; | |
102 | uint64_t id; | |
103 | blkif_sector_t sector_number; | |
104 | blkif_vdev_t handle; | |
105 | uint16_t _pad1; | |
106 | grant_ref_t indirect_grefs[BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST]; | |
107 | /* | |
108 | * The maximum number of indirect segments (and pages) that will | |
109 | * be used is determined by MAX_INDIRECT_SEGMENTS, this value | |
110 | * is also exported to the guest (via xenstore | |
111 | * feature-max-indirect-segments entry), so the frontend knows how | |
112 | * many indirect segments the backend supports. | |
113 | */ | |
114 | uint64_t _pad2; /* make it 64 byte aligned */ | |
115 | } __attribute__((__packed__)); | |
116 | ||
452a6b2b KRW |
117 | struct blkif_x86_32_request { |
118 | uint8_t operation; /* BLKIF_OP_??? */ | |
b3cb0d6a LD |
119 | union { |
120 | struct blkif_x86_32_request_rw rw; | |
121 | struct blkif_x86_32_request_discard discard; | |
0e367ae4 | 122 | struct blkif_x86_32_request_other other; |
402b27f9 | 123 | struct blkif_x86_32_request_indirect indirect; |
b3cb0d6a | 124 | } u; |
97e36834 KRW |
125 | } __attribute__((__packed__)); |
126 | ||
127 | /* i386 protocol version */ | |
128 | #pragma pack(push, 4) | |
452a6b2b KRW |
129 | struct blkif_x86_32_response { |
130 | uint64_t id; /* copied from request */ | |
131 | uint8_t operation; /* copied from request */ | |
132 | int16_t status; /* BLKIF_RSP_??? */ | |
133 | }; | |
452a6b2b | 134 | #pragma pack(pop) |
452a6b2b | 135 | /* x86_64 protocol version */ |
b3cb0d6a LD |
136 | |
137 | struct blkif_x86_64_request_rw { | |
97e36834 KRW |
138 | uint8_t nr_segments; /* number of segments */ |
139 | blkif_vdev_t handle; /* only for read/write requests */ | |
140 | uint32_t _pad1; /* offsetof(blkif_reqest..,u.rw.id)==8 */ | |
141 | uint64_t id; | |
b3cb0d6a LD |
142 | blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ |
143 | struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST]; | |
97e36834 | 144 | } __attribute__((__packed__)); |
b3cb0d6a LD |
145 | |
146 | struct blkif_x86_64_request_discard { | |
5ea42986 | 147 | uint8_t flag; /* BLKIF_DISCARD_SECURE or zero */ |
97e36834 KRW |
148 | blkif_vdev_t _pad1; /* was "handle" for read/write requests */ |
149 | uint32_t _pad2; /* offsetof(blkif_..,u.discard.id)==8 */ | |
150 | uint64_t id; | |
b3cb0d6a | 151 | blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ |
97e36834 KRW |
152 | uint64_t nr_sectors; |
153 | } __attribute__((__packed__)); | |
b3cb0d6a | 154 | |
0e367ae4 DV |
155 | struct blkif_x86_64_request_other { |
156 | uint8_t _pad1; | |
157 | blkif_vdev_t _pad2; | |
158 | uint32_t _pad3; /* offsetof(blkif_..,u.discard.id)==8 */ | |
159 | uint64_t id; /* private guest value, echoed in resp */ | |
160 | } __attribute__((__packed__)); | |
161 | ||
402b27f9 RPM |
162 | struct blkif_x86_64_request_indirect { |
163 | uint8_t indirect_op; | |
164 | uint16_t nr_segments; | |
165 | uint32_t _pad1; /* offsetof(blkif_..,u.indirect.id)==8 */ | |
166 | uint64_t id; | |
167 | blkif_sector_t sector_number; | |
168 | blkif_vdev_t handle; | |
169 | uint16_t _pad2; | |
170 | grant_ref_t indirect_grefs[BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST]; | |
171 | /* | |
172 | * The maximum number of indirect segments (and pages) that will | |
173 | * be used is determined by MAX_INDIRECT_SEGMENTS, this value | |
174 | * is also exported to the guest (via xenstore | |
175 | * feature-max-indirect-segments entry), so the frontend knows how | |
176 | * many indirect segments the backend supports. | |
177 | */ | |
178 | uint32_t _pad3; /* make it 64 byte aligned */ | |
179 | } __attribute__((__packed__)); | |
180 | ||
452a6b2b KRW |
181 | struct blkif_x86_64_request { |
182 | uint8_t operation; /* BLKIF_OP_??? */ | |
b3cb0d6a LD |
183 | union { |
184 | struct blkif_x86_64_request_rw rw; | |
185 | struct blkif_x86_64_request_discard discard; | |
0e367ae4 | 186 | struct blkif_x86_64_request_other other; |
402b27f9 | 187 | struct blkif_x86_64_request_indirect indirect; |
b3cb0d6a | 188 | } u; |
97e36834 KRW |
189 | } __attribute__((__packed__)); |
190 | ||
452a6b2b KRW |
191 | struct blkif_x86_64_response { |
192 | uint64_t __attribute__((__aligned__(8))) id; | |
193 | uint8_t operation; /* copied from request */ | |
194 | int16_t status; /* BLKIF_RSP_??? */ | |
195 | }; | |
452a6b2b KRW |
196 | |
197 | DEFINE_RING_TYPES(blkif_common, struct blkif_common_request, | |
198 | struct blkif_common_response); | |
199 | DEFINE_RING_TYPES(blkif_x86_32, struct blkif_x86_32_request, | |
200 | struct blkif_x86_32_response); | |
201 | DEFINE_RING_TYPES(blkif_x86_64, struct blkif_x86_64_request, | |
202 | struct blkif_x86_64_response); | |
203 | ||
204 | union blkif_back_rings { | |
205 | struct blkif_back_ring native; | |
206 | struct blkif_common_back_ring common; | |
207 | struct blkif_x86_32_back_ring x86_32; | |
208 | struct blkif_x86_64_back_ring x86_64; | |
209 | }; | |
210 | ||
211 | enum blkif_protocol { | |
212 | BLKIF_PROTOCOL_NATIVE = 1, | |
213 | BLKIF_PROTOCOL_X86_32 = 2, | |
214 | BLKIF_PROTOCOL_X86_64 = 3, | |
215 | }; | |
216 | ||
3d814731 | 217 | struct xen_vbd { |
01f37f2d KRW |
218 | /* What the domain refers to this vbd as. */ |
219 | blkif_vdev_t handle; | |
220 | /* Non-zero -> read-only */ | |
221 | unsigned char readonly; | |
222 | /* VDISK_xxx */ | |
223 | unsigned char type; | |
224 | /* phys device that this vbd maps to. */ | |
225 | u32 pdevice; | |
226 | struct block_device *bdev; | |
227 | /* Cached size parameter. */ | |
228 | sector_t size; | |
1f999572 OC |
229 | unsigned int flush_support:1; |
230 | unsigned int discard_secure:1; | |
0a8704a5 RPM |
231 | unsigned int feature_gnt_persistent:1; |
232 | unsigned int overflow_max_grants:1; | |
4d05a28d KRW |
233 | }; |
234 | ||
235 | struct backend_info; | |
236 | ||
3f3aad5e RPM |
237 | /* Number of available flags */ |
238 | #define PERSISTENT_GNT_FLAGS_SIZE 2 | |
239 | /* This persistent grant is currently in use */ | |
240 | #define PERSISTENT_GNT_ACTIVE 0 | |
241 | /* | |
242 | * This persistent grant has been used, this flag is set when we remove the | |
243 | * PERSISTENT_GNT_ACTIVE, to know that this grant has been used recently. | |
244 | */ | |
245 | #define PERSISTENT_GNT_WAS_ACTIVE 1 | |
0a8704a5 | 246 | |
bf0720c4 RPM |
247 | /* Number of requests that we can fit in a ring */ |
248 | #define XEN_BLKIF_REQS 32 | |
249 | ||
0a8704a5 RPM |
250 | struct persistent_gnt { |
251 | struct page *page; | |
252 | grant_ref_t gnt; | |
253 | grant_handle_t handle; | |
3f3aad5e | 254 | DECLARE_BITMAP(flags, PERSISTENT_GNT_FLAGS_SIZE); |
0a8704a5 | 255 | struct rb_node node; |
3f3aad5e | 256 | struct list_head remove_node; |
0a8704a5 RPM |
257 | }; |
258 | ||
30fd1502 | 259 | struct xen_blkif { |
4d05a28d | 260 | /* Unique identifier for this interface. */ |
01f37f2d KRW |
261 | domid_t domid; |
262 | unsigned int handle; | |
4d05a28d | 263 | /* Physical parameters of the comms window. */ |
01f37f2d | 264 | unsigned int irq; |
4d05a28d | 265 | /* Comms information. */ |
01f37f2d KRW |
266 | enum blkif_protocol blk_protocol; |
267 | union blkif_back_rings blk_rings; | |
2d073846 | 268 | void *blk_ring; |
4d05a28d | 269 | /* The VBD attached to this interface. */ |
3d814731 | 270 | struct xen_vbd vbd; |
4d05a28d | 271 | /* Back pointer to the backend_info. */ |
01f37f2d | 272 | struct backend_info *be; |
4d05a28d | 273 | /* Private fields. */ |
01f37f2d KRW |
274 | spinlock_t blk_ring_lock; |
275 | atomic_t refcnt; | |
4d05a28d | 276 | |
01f37f2d | 277 | wait_queue_head_t wq; |
29bde093 KRW |
278 | /* for barrier (drain) requests */ |
279 | struct completion drain_complete; | |
280 | atomic_t drain; | |
c05f3e3c | 281 | atomic_t inflight; |
a1397fa3 | 282 | /* One thread per one blkif. */ |
01f37f2d KRW |
283 | struct task_struct *xenblkd; |
284 | unsigned int waiting_reqs; | |
4d05a28d | 285 | |
0a8704a5 RPM |
286 | /* tree to store persistent grants */ |
287 | struct rb_root persistent_gnts; | |
288 | unsigned int persistent_gnt_c; | |
3f3aad5e RPM |
289 | atomic_t persistent_gnt_in_use; |
290 | unsigned long next_lru; | |
291 | ||
292 | /* used by the kworker that offload work from the persistent purge */ | |
293 | struct list_head persistent_purge_list; | |
294 | struct work_struct persistent_purge_work; | |
0a8704a5 | 295 | |
c6cc142d RPM |
296 | /* buffer of free pages to map grant refs */ |
297 | spinlock_t free_pages_lock; | |
298 | int free_pages_num; | |
299 | struct list_head free_pages; | |
300 | ||
bf0720c4 RPM |
301 | /* List of all 'pending_req' available */ |
302 | struct list_head pending_free; | |
303 | /* And its spinlock. */ | |
304 | spinlock_t pending_free_lock; | |
305 | wait_queue_head_t pending_free_wq; | |
306 | ||
4d05a28d | 307 | /* statistics */ |
01f37f2d | 308 | unsigned long st_print; |
986cacbd ZK |
309 | unsigned long long st_rd_req; |
310 | unsigned long long st_wr_req; | |
311 | unsigned long long st_oo_req; | |
312 | unsigned long long st_f_req; | |
313 | unsigned long long st_ds_req; | |
314 | unsigned long long st_rd_sect; | |
315 | unsigned long long st_wr_sect; | |
01f37f2d KRW |
316 | |
317 | wait_queue_head_t waiting_to_free; | |
8e3f8755 KRW |
318 | /* Thread shutdown wait queue. */ |
319 | wait_queue_head_t shutdown_wq; | |
5489377c | 320 | }; |
4d05a28d | 321 | |
402b27f9 RPM |
322 | struct seg_buf { |
323 | unsigned long offset; | |
324 | unsigned int nsec; | |
325 | }; | |
326 | ||
bb642e83 RPM |
327 | struct grant_page { |
328 | struct page *page; | |
329 | struct persistent_gnt *persistent_gnt; | |
330 | grant_handle_t handle; | |
331 | grant_ref_t gref; | |
332 | }; | |
333 | ||
bf0720c4 RPM |
334 | /* |
335 | * Each outstanding request that we've passed to the lower device layers has a | |
336 | * 'pending_req' allocated to it. Each buffer_head that completes decrements | |
337 | * the pendcnt towards zero. When it hits zero, the specified domain has a | |
338 | * response queued for it, with the saved 'id' passed back. | |
339 | */ | |
340 | struct pending_req { | |
341 | struct xen_blkif *blkif; | |
342 | u64 id; | |
343 | int nr_pages; | |
344 | atomic_t pendcnt; | |
345 | unsigned short operation; | |
346 | int status; | |
347 | struct list_head free_list; | |
bb642e83 | 348 | struct grant_page *segments[MAX_INDIRECT_SEGMENTS]; |
402b27f9 | 349 | /* Indirect descriptors */ |
bb642e83 | 350 | struct grant_page *indirect_pages[MAX_INDIRECT_PAGES]; |
402b27f9 RPM |
351 | struct seg_buf seg[MAX_INDIRECT_SEGMENTS]; |
352 | struct bio *biolist[MAX_INDIRECT_SEGMENTS]; | |
bf0720c4 RPM |
353 | }; |
354 | ||
42c7841d KRW |
355 | |
356 | #define vbd_sz(_v) ((_v)->bdev->bd_part ? \ | |
357 | (_v)->bdev->bd_part->nr_sects : \ | |
358 | get_capacity((_v)->bdev->bd_disk)) | |
4d05a28d | 359 | |
8b6bf747 KRW |
360 | #define xen_blkif_get(_b) (atomic_inc(&(_b)->refcnt)) |
361 | #define xen_blkif_put(_b) \ | |
4d05a28d KRW |
362 | do { \ |
363 | if (atomic_dec_and_test(&(_b)->refcnt)) \ | |
364 | wake_up(&(_b)->waiting_to_free);\ | |
365 | } while (0) | |
366 | ||
4d05a28d | 367 | struct phys_req { |
01f37f2d | 368 | unsigned short dev; |
b3cb0d6a | 369 | blkif_sector_t nr_sects; |
01f37f2d KRW |
370 | struct block_device *bdev; |
371 | blkif_sector_t sector_number; | |
4d05a28d | 372 | }; |
8b6bf747 | 373 | int xen_blkif_interface_init(void); |
4d05a28d | 374 | |
8b6bf747 | 375 | int xen_blkif_xenbus_init(void); |
4d05a28d | 376 | |
8b6bf747 KRW |
377 | irqreturn_t xen_blkif_be_int(int irq, void *dev_id); |
378 | int xen_blkif_schedule(void *arg); | |
3f3aad5e | 379 | int xen_blkif_purge_persistent(void *arg); |
ef753411 | 380 | void xen_blkbk_free_caches(struct xen_blkif *blkif); |
4d05a28d | 381 | |
24f567f9 KRW |
382 | int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt, |
383 | struct backend_info *be, int state); | |
4d05a28d | 384 | |
29bde093 KRW |
385 | int xen_blkbk_barrier(struct xenbus_transaction xbt, |
386 | struct backend_info *be, int state); | |
8b6bf747 | 387 | struct xenbus_device *xen_blkbk_xenbus(struct backend_info *be); |
abb97b8c | 388 | void xen_blkbk_unmap_purged_grants(struct work_struct *work); |
98e036a3 | 389 | |
b0f80127 | 390 | static inline void blkif_get_x86_32_req(struct blkif_request *dst, |
68c88dd7 KRW |
391 | struct blkif_x86_32_request *src) |
392 | { | |
402b27f9 | 393 | int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST, j; |
68c88dd7 | 394 | dst->operation = src->operation; |
b3cb0d6a LD |
395 | switch (src->operation) { |
396 | case BLKIF_OP_READ: | |
397 | case BLKIF_OP_WRITE: | |
398 | case BLKIF_OP_WRITE_BARRIER: | |
399 | case BLKIF_OP_FLUSH_DISKCACHE: | |
97e36834 KRW |
400 | dst->u.rw.nr_segments = src->u.rw.nr_segments; |
401 | dst->u.rw.handle = src->u.rw.handle; | |
402 | dst->u.rw.id = src->u.rw.id; | |
b3cb0d6a LD |
403 | dst->u.rw.sector_number = src->u.rw.sector_number; |
404 | barrier(); | |
97e36834 KRW |
405 | if (n > dst->u.rw.nr_segments) |
406 | n = dst->u.rw.nr_segments; | |
b3cb0d6a LD |
407 | for (i = 0; i < n; i++) |
408 | dst->u.rw.seg[i] = src->u.rw.seg[i]; | |
409 | break; | |
410 | case BLKIF_OP_DISCARD: | |
5ea42986 | 411 | dst->u.discard.flag = src->u.discard.flag; |
8c9ce606 | 412 | dst->u.discard.id = src->u.discard.id; |
b3cb0d6a LD |
413 | dst->u.discard.sector_number = src->u.discard.sector_number; |
414 | dst->u.discard.nr_sectors = src->u.discard.nr_sectors; | |
415 | break; | |
402b27f9 RPM |
416 | case BLKIF_OP_INDIRECT: |
417 | dst->u.indirect.indirect_op = src->u.indirect.indirect_op; | |
418 | dst->u.indirect.nr_segments = src->u.indirect.nr_segments; | |
419 | dst->u.indirect.handle = src->u.indirect.handle; | |
420 | dst->u.indirect.id = src->u.indirect.id; | |
421 | dst->u.indirect.sector_number = src->u.indirect.sector_number; | |
422 | barrier(); | |
423 | j = min(MAX_INDIRECT_PAGES, INDIRECT_PAGES(dst->u.indirect.nr_segments)); | |
424 | for (i = 0; i < j; i++) | |
425 | dst->u.indirect.indirect_grefs[i] = | |
426 | src->u.indirect.indirect_grefs[i]; | |
427 | break; | |
b3cb0d6a | 428 | default: |
0e367ae4 DV |
429 | /* |
430 | * Don't know how to translate this op. Only get the | |
431 | * ID so failure can be reported to the frontend. | |
432 | */ | |
433 | dst->u.other.id = src->u.other.id; | |
b3cb0d6a LD |
434 | break; |
435 | } | |
68c88dd7 KRW |
436 | } |
437 | ||
b0f80127 | 438 | static inline void blkif_get_x86_64_req(struct blkif_request *dst, |
68c88dd7 KRW |
439 | struct blkif_x86_64_request *src) |
440 | { | |
402b27f9 | 441 | int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST, j; |
68c88dd7 | 442 | dst->operation = src->operation; |
b3cb0d6a LD |
443 | switch (src->operation) { |
444 | case BLKIF_OP_READ: | |
445 | case BLKIF_OP_WRITE: | |
446 | case BLKIF_OP_WRITE_BARRIER: | |
447 | case BLKIF_OP_FLUSH_DISKCACHE: | |
97e36834 KRW |
448 | dst->u.rw.nr_segments = src->u.rw.nr_segments; |
449 | dst->u.rw.handle = src->u.rw.handle; | |
450 | dst->u.rw.id = src->u.rw.id; | |
b3cb0d6a LD |
451 | dst->u.rw.sector_number = src->u.rw.sector_number; |
452 | barrier(); | |
97e36834 KRW |
453 | if (n > dst->u.rw.nr_segments) |
454 | n = dst->u.rw.nr_segments; | |
b3cb0d6a LD |
455 | for (i = 0; i < n; i++) |
456 | dst->u.rw.seg[i] = src->u.rw.seg[i]; | |
457 | break; | |
458 | case BLKIF_OP_DISCARD: | |
5ea42986 | 459 | dst->u.discard.flag = src->u.discard.flag; |
8c9ce606 | 460 | dst->u.discard.id = src->u.discard.id; |
b3cb0d6a LD |
461 | dst->u.discard.sector_number = src->u.discard.sector_number; |
462 | dst->u.discard.nr_sectors = src->u.discard.nr_sectors; | |
463 | break; | |
402b27f9 RPM |
464 | case BLKIF_OP_INDIRECT: |
465 | dst->u.indirect.indirect_op = src->u.indirect.indirect_op; | |
466 | dst->u.indirect.nr_segments = src->u.indirect.nr_segments; | |
467 | dst->u.indirect.handle = src->u.indirect.handle; | |
468 | dst->u.indirect.id = src->u.indirect.id; | |
469 | dst->u.indirect.sector_number = src->u.indirect.sector_number; | |
470 | barrier(); | |
471 | j = min(MAX_INDIRECT_PAGES, INDIRECT_PAGES(dst->u.indirect.nr_segments)); | |
472 | for (i = 0; i < j; i++) | |
473 | dst->u.indirect.indirect_grefs[i] = | |
474 | src->u.indirect.indirect_grefs[i]; | |
475 | break; | |
b3cb0d6a | 476 | default: |
0e367ae4 DV |
477 | /* |
478 | * Don't know how to translate this op. Only get the | |
479 | * ID so failure can be reported to the frontend. | |
480 | */ | |
481 | dst->u.other.id = src->u.other.id; | |
b3cb0d6a LD |
482 | break; |
483 | } | |
68c88dd7 KRW |
484 | } |
485 | ||
5a577e38 | 486 | #endif /* __XEN_BLKIF__BACKEND__COMMON_H__ */ |