1 | /* |
2 | * Copyright (C) 2009-2010 Nippon Telegraph and Telephone Corporation. |
3 | * |
4 | * This program is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU General Public License version |
6 | * 2 as published by the Free Software Foundation. |
7 | * |
8 | * You should have received a copy of the GNU General Public License |
9 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
10 | * |
11 | * Contributions after 2012-01-13 are licensed under the terms of the |
12 | * GNU GPL, version 2 or (at your option) any later version. |
13 | */ |
14 | |
15 | #include "qemu/osdep.h" |
16 | #include "qemu-common.h" |
17 | #include "qapi/error.h" |
18 | #include "qapi/qapi-visit-sockets.h" |
19 | #include "qapi/qapi-visit-block-core.h" |
20 | #include "qapi/qmp/qdict.h" |
21 | #include "qapi/qobject-input-visitor.h" |
22 | #include "qapi/qobject-output-visitor.h" |
23 | #include "qemu/uri.h" |
24 | #include "qemu/error-report.h" |
25 | #include "qemu/main-loop.h" |
26 | #include "qemu/module.h" |
27 | #include "qemu/option.h" |
28 | #include "qemu/sockets.h" |
29 | #include "block/block_int.h" |
30 | #include "block/qdict.h" |
31 | #include "sysemu/block-backend.h" |
32 | #include "qemu/bitops.h" |
33 | #include "qemu/cutils.h" |
34 | #include "trace.h" |
35 | |
36 | #define SD_PROTO_VER 0x01 |
37 | |
38 | #define SD_DEFAULT_ADDR "localhost" |
39 | #define SD_DEFAULT_PORT 7000 |
40 | |
41 | #define SD_OP_CREATE_AND_WRITE_OBJ 0x01 |
42 | #define SD_OP_READ_OBJ 0x02 |
43 | #define SD_OP_WRITE_OBJ 0x03 |
44 | /* 0x04 is used internally by Sheepdog */ |
45 | |
46 | #define SD_OP_NEW_VDI 0x11 |
47 | #define SD_OP_LOCK_VDI 0x12 |
48 | #define SD_OP_RELEASE_VDI 0x13 |
49 | #define SD_OP_GET_VDI_INFO 0x14 |
50 | #define SD_OP_READ_VDIS 0x15 |
51 | #define SD_OP_FLUSH_VDI 0x16 |
52 | #define SD_OP_DEL_VDI 0x17 |
53 | #define SD_OP_GET_CLUSTER_DEFAULT 0x18 |
54 | |
55 | #define SD_FLAG_CMD_WRITE 0x01 |
56 | #define SD_FLAG_CMD_COW 0x02 |
57 | #define SD_FLAG_CMD_CACHE 0x04 /* Writeback mode for cache */ |
58 | #define SD_FLAG_CMD_DIRECT 0x08 /* Don't use cache */ |
59 | |
60 | #define SD_RES_SUCCESS 0x00 /* Success */ |
61 | #define SD_RES_UNKNOWN 0x01 /* Unknown error */ |
62 | #define SD_RES_NO_OBJ 0x02 /* No object found */ |
63 | #define SD_RES_EIO 0x03 /* I/O error */ |
64 | #define SD_RES_VDI_EXIST 0x04 /* Vdi exists already */ |
65 | #define SD_RES_INVALID_PARMS 0x05 /* Invalid parameters */ |
66 | #define SD_RES_SYSTEM_ERROR 0x06 /* System error */ |
67 | #define SD_RES_VDI_LOCKED 0x07 /* Vdi is locked */ |
68 | #define SD_RES_NO_VDI 0x08 /* No vdi found */ |
69 | #define SD_RES_NO_BASE_VDI 0x09 /* No base vdi found */ |
70 | #define SD_RES_VDI_READ 0x0A /* Cannot read requested vdi */ |
71 | #define SD_RES_VDI_WRITE 0x0B /* Cannot write requested vdi */ |
72 | #define SD_RES_BASE_VDI_READ 0x0C /* Cannot read base vdi */ |
73 | #define SD_RES_BASE_VDI_WRITE 0x0D /* Cannot write base vdi */ |
74 | #define SD_RES_NO_TAG 0x0E /* Requested tag is not found */ |
75 | #define SD_RES_STARTUP 0x0F /* Sheepdog is on starting up */ |
76 | #define SD_RES_VDI_NOT_LOCKED 0x10 /* Vdi is not locked */ |
77 | #define SD_RES_SHUTDOWN 0x11 /* Sheepdog is shutting down */ |
78 | #define SD_RES_NO_MEM 0x12 /* Cannot allocate memory */ |
79 | #define SD_RES_FULL_VDI 0x13 /* we already have the maximum vdis */ |
80 | #define SD_RES_VER_MISMATCH 0x14 /* Protocol version mismatch */ |
81 | #define SD_RES_NO_SPACE 0x15 /* Server has no room for new objects */ |
82 | #define SD_RES_WAIT_FOR_FORMAT 0x16 /* Waiting for a format operation */ |
83 | #define SD_RES_WAIT_FOR_JOIN 0x17 /* Waiting for other nodes joining */ |
84 | #define SD_RES_JOIN_FAILED 0x18 /* Target node had failed to join sheepdog */ |
85 | #define SD_RES_HALT 0x19 /* Sheepdog is stopped serving IO request */ |
86 | #define SD_RES_READONLY 0x1A /* Object is read-only */ |
87 | |
88 | /* |
89 | * Object ID rules |
90 | * |
91 | * 0 - 19 (20 bits): data object space |
92 | * 20 - 31 (12 bits): reserved data object space |
93 | * 32 - 55 (24 bits): vdi object space |
94 | * 56 - 59 ( 4 bits): reserved vdi object space |
95 | * 60 - 63 ( 4 bits): object type identifier space |
96 | */ |
97 | |
98 | #define VDI_SPACE_SHIFT 32 |
99 | #define VDI_BIT (UINT64_C(1) << 63) |
100 | #define VMSTATE_BIT (UINT64_C(1) << 62) |
101 | #define MAX_DATA_OBJS (UINT64_C(1) << 20) |
102 | #define MAX_CHILDREN 1024 |
103 | #define SD_MAX_VDI_LEN 256 |
104 | #define SD_MAX_VDI_TAG_LEN 256 |
105 | #define SD_NR_VDIS (1U << 24) |
106 | #define SD_DATA_OBJ_SIZE (UINT64_C(1) << 22) |
107 | #define SD_MAX_VDI_SIZE (SD_DATA_OBJ_SIZE * MAX_DATA_OBJS) |
108 | #define SD_DEFAULT_BLOCK_SIZE_SHIFT 22 |
109 | /* |
110 | * For erasure coding, we use at most SD_EC_MAX_STRIP for data strips and |
111 | * (SD_EC_MAX_STRIP - 1) for parity strips |
112 | * |
113 | * SD_MAX_COPIES is sum of number of data strips and parity strips. |
114 | */ |
115 | #define SD_EC_MAX_STRIP 16 |
116 | #define SD_MAX_COPIES (SD_EC_MAX_STRIP * 2 - 1) |
117 | |
118 | #define SD_INODE_SIZE (sizeof(SheepdogInode)) |
119 | #define CURRENT_VDI_ID 0 |
120 | |
121 | #define LOCK_TYPE_NORMAL 0 |
122 | #define LOCK_TYPE_SHARED 1 /* for iSCSI multipath */ |
123 | |
124 | typedef struct SheepdogReq { |
125 | uint8_t proto_ver; |
126 | uint8_t opcode; |
127 | uint16_t flags; |
128 | uint32_t epoch; |
129 | uint32_t id; |
130 | uint32_t data_length; |
131 | uint32_t opcode_specific[8]; |
132 | } SheepdogReq; |
133 | |
134 | typedef struct SheepdogRsp { |
135 | uint8_t proto_ver; |
136 | uint8_t opcode; |
137 | uint16_t flags; |
138 | uint32_t epoch; |
139 | uint32_t id; |
140 | uint32_t data_length; |
141 | uint32_t result; |
142 | uint32_t opcode_specific[7]; |
143 | } SheepdogRsp; |
144 | |
145 | typedef struct SheepdogObjReq { |
146 | uint8_t proto_ver; |
147 | uint8_t opcode; |
148 | uint16_t flags; |
149 | uint32_t epoch; |
150 | uint32_t id; |
151 | uint32_t data_length; |
152 | uint64_t oid; |
153 | uint64_t cow_oid; |
154 | uint8_t copies; |
155 | uint8_t copy_policy; |
156 | uint8_t reserved[6]; |
157 | uint64_t offset; |
158 | } SheepdogObjReq; |
159 | |
160 | typedef struct SheepdogObjRsp { |
161 | uint8_t proto_ver; |
162 | uint8_t opcode; |
163 | uint16_t flags; |
164 | uint32_t epoch; |
165 | uint32_t id; |
166 | uint32_t data_length; |
167 | uint32_t result; |
168 | uint8_t copies; |
169 | uint8_t copy_policy; |
170 | uint8_t reserved[2]; |
171 | uint32_t pad[6]; |
172 | } SheepdogObjRsp; |
173 | |
174 | typedef struct SheepdogVdiReq { |
175 | uint8_t proto_ver; |
176 | uint8_t opcode; |
177 | uint16_t flags; |
178 | uint32_t epoch; |
179 | uint32_t id; |
180 | uint32_t data_length; |
181 | uint64_t vdi_size; |
182 | uint32_t base_vdi_id; |
183 | uint8_t copies; |
184 | uint8_t copy_policy; |
185 | uint8_t store_policy; |
186 | uint8_t block_size_shift; |
187 | uint32_t snapid; |
188 | uint32_t type; |
189 | uint32_t pad[2]; |
190 | } SheepdogVdiReq; |
191 | |
192 | typedef struct SheepdogVdiRsp { |
193 | uint8_t proto_ver; |
194 | uint8_t opcode; |
195 | uint16_t flags; |
196 | uint32_t epoch; |
197 | uint32_t id; |
198 | uint32_t data_length; |
199 | uint32_t result; |
200 | uint32_t rsvd; |
201 | uint32_t vdi_id; |
202 | uint32_t pad[5]; |
203 | } SheepdogVdiRsp; |
204 | |
205 | typedef struct SheepdogClusterRsp { |
206 | uint8_t proto_ver; |
207 | uint8_t opcode; |
208 | uint16_t flags; |
209 | uint32_t epoch; |
210 | uint32_t id; |
211 | uint32_t data_length; |
212 | uint32_t result; |
213 | uint8_t nr_copies; |
214 | uint8_t copy_policy; |
215 | uint8_t block_size_shift; |
216 | uint8_t __pad1; |
217 | uint32_t __pad2[6]; |
218 | } SheepdogClusterRsp; |
219 | |
220 | typedef struct SheepdogInode { |
221 | char name[SD_MAX_VDI_LEN]; |
222 | char tag[SD_MAX_VDI_TAG_LEN]; |
223 | uint64_t ctime; |
224 | uint64_t snap_ctime; |
225 | uint64_t vm_clock_nsec; |
226 | uint64_t vdi_size; |
227 | uint64_t vm_state_size; |
228 | uint16_t copy_policy; |
229 | uint8_t nr_copies; |
230 | uint8_t block_size_shift; |
231 | uint32_t snap_id; |
232 | uint32_t vdi_id; |
233 | uint32_t parent_vdi_id; |
234 | uint32_t child_vdi_id[MAX_CHILDREN]; |
235 | uint32_t data_vdi_id[MAX_DATA_OBJS]; |
236 | } SheepdogInode; |
237 | |
238 | #define offsetof(SheepdogInode, data_vdi_id) |
239 | |
240 | /* |
241 | * 64 bit FNV-1a non-zero initial basis |
242 | */ |
243 | #define FNV1A_64_INIT ((uint64_t)0xcbf29ce484222325ULL) |
244 | |
245 | /* |
246 | * 64 bit Fowler/Noll/Vo FNV-1a hash code |
247 | */ |
248 | static inline uint64_t fnv_64a_buf(void *buf, size_t len, uint64_t hval) |
249 | { |
250 | unsigned char *bp = buf; |
251 | unsigned char *be = bp + len; |
252 | while (bp < be) { |
253 | hval ^= (uint64_t) *bp++; |
254 | hval += (hval << 1) + (hval << 4) + (hval << 5) + |
255 | (hval << 7) + (hval << 8) + (hval << 40); |
256 | } |
257 | return hval; |
258 | } |
259 | |
260 | static inline bool is_data_obj_writable(SheepdogInode *inode, unsigned int idx) |
261 | { |
262 | return inode->vdi_id == inode->data_vdi_id[idx]; |
263 | } |
264 | |
265 | static inline bool is_data_obj(uint64_t oid) |
266 | { |
267 | return !(VDI_BIT & oid); |
268 | } |
269 | |
270 | static inline uint64_t data_oid_to_idx(uint64_t oid) |
271 | { |
272 | return oid & (MAX_DATA_OBJS - 1); |
273 | } |
274 | |
275 | static inline uint32_t oid_to_vid(uint64_t oid) |
276 | { |
277 | return (oid & ~VDI_BIT) >> VDI_SPACE_SHIFT; |
278 | } |
279 | |
280 | static inline uint64_t vid_to_vdi_oid(uint32_t vid) |
281 | { |
282 | return VDI_BIT | ((uint64_t)vid << VDI_SPACE_SHIFT); |
283 | } |
284 | |
285 | static inline uint64_t vid_to_vmstate_oid(uint32_t vid, uint32_t idx) |
286 | { |
287 | return VMSTATE_BIT | ((uint64_t)vid << VDI_SPACE_SHIFT) | idx; |
288 | } |
289 | |
290 | static inline uint64_t vid_to_data_oid(uint32_t vid, uint32_t idx) |
291 | { |
292 | return ((uint64_t)vid << VDI_SPACE_SHIFT) | idx; |
293 | } |
294 | |
295 | static inline bool is_snapshot(struct SheepdogInode *inode) |
296 | { |
297 | return !!inode->snap_ctime; |
298 | } |
299 | |
300 | static inline size_t count_data_objs(const struct SheepdogInode *inode) |
301 | { |
302 | return DIV_ROUND_UP(inode->vdi_size, |
303 | (1UL << inode->block_size_shift)); |
304 | } |
305 | |
306 | typedef struct SheepdogAIOCB SheepdogAIOCB; |
307 | typedef struct BDRVSheepdogState BDRVSheepdogState; |
308 | |
309 | typedef struct AIOReq { |
310 | SheepdogAIOCB *aiocb; |
311 | unsigned int iov_offset; |
312 | |
313 | uint64_t oid; |
314 | uint64_t base_oid; |
315 | uint64_t offset; |
316 | unsigned int data_len; |
317 | uint8_t flags; |
318 | uint32_t id; |
319 | bool create; |
320 | |
321 | QLIST_ENTRY(AIOReq) aio_siblings; |
322 | } AIOReq; |
323 | |
324 | enum AIOCBState { |
325 | AIOCB_WRITE_UDATA, |
326 | AIOCB_READ_UDATA, |
327 | AIOCB_FLUSH_CACHE, |
328 | AIOCB_DISCARD_OBJ, |
329 | }; |
330 | |
331 | #define AIOCBOverlapping(x, y) \ |
332 | (!(x->max_affect_data_idx < y->min_affect_data_idx \ |
333 | || y->max_affect_data_idx < x->min_affect_data_idx)) |
334 | |
335 | struct SheepdogAIOCB { |
336 | BDRVSheepdogState *s; |
337 | |
338 | QEMUIOVector *qiov; |
339 | |
340 | int64_t sector_num; |
341 | int nb_sectors; |
342 | |
343 | int ret; |
344 | enum AIOCBState aiocb_type; |
345 | |
346 | Coroutine *coroutine; |
347 | int nr_pending; |
348 | |
349 | uint32_t min_affect_data_idx; |
350 | uint32_t max_affect_data_idx; |
351 | |
352 | /* |
353 | * The difference between affect_data_idx and dirty_data_idx: |
354 | * affect_data_idx represents range of index of all request types. |
355 | * dirty_data_idx represents range of index updated by COW requests. |
356 | * dirty_data_idx is used for updating an inode object. |
357 | */ |
358 | uint32_t min_dirty_data_idx; |
359 | uint32_t max_dirty_data_idx; |
360 | |
361 | QLIST_ENTRY(SheepdogAIOCB) aiocb_siblings; |
362 | }; |
363 | |
364 | struct BDRVSheepdogState { |
365 | BlockDriverState *bs; |
366 | AioContext *aio_context; |
367 | |
368 | SheepdogInode inode; |
369 | |
370 | char name[SD_MAX_VDI_LEN]; |
371 | bool is_snapshot; |
372 | uint32_t cache_flags; |
373 | bool discard_supported; |
374 | |
375 | SocketAddress *addr; |
376 | int fd; |
377 | |
378 | CoMutex lock; |
379 | Coroutine *co_send; |
380 | Coroutine *co_recv; |
381 | |
382 | uint32_t aioreq_seq_num; |
383 | |
384 | /* Every aio request must be linked to either of these queues. */ |
385 | QLIST_HEAD(, AIOReq) inflight_aio_head; |
386 | QLIST_HEAD(, AIOReq) failed_aio_head; |
387 | |
388 | CoMutex queue_lock; |
389 | CoQueue overlapping_queue; |
390 | QLIST_HEAD(, SheepdogAIOCB) inflight_aiocb_head; |
391 | }; |
392 | |
393 | typedef struct BDRVSheepdogReopenState { |
394 | int fd; |
395 | int cache_flags; |
396 | } BDRVSheepdogReopenState; |
397 | |
398 | static const char *sd_strerror(int err) |
399 | { |
400 | int i; |
401 | |
402 | static const struct { |
403 | int err; |
404 | const char *desc; |
405 | } errors[] = { |
406 | {SD_RES_SUCCESS, "Success" }, |
407 | {SD_RES_UNKNOWN, "Unknown error" }, |
408 | {SD_RES_NO_OBJ, "No object found" }, |
409 | {SD_RES_EIO, "I/O error" }, |
410 | {SD_RES_VDI_EXIST, "VDI exists already" }, |
411 | {SD_RES_INVALID_PARMS, "Invalid parameters" }, |
412 | {SD_RES_SYSTEM_ERROR, "System error" }, |
413 | {SD_RES_VDI_LOCKED, "VDI is already locked" }, |
414 | {SD_RES_NO_VDI, "No vdi found" }, |
415 | {SD_RES_NO_BASE_VDI, "No base VDI found" }, |
416 | {SD_RES_VDI_READ, "Failed read the requested VDI" }, |
417 | {SD_RES_VDI_WRITE, "Failed to write the requested VDI" }, |
418 | {SD_RES_BASE_VDI_READ, "Failed to read the base VDI" }, |
419 | {SD_RES_BASE_VDI_WRITE, "Failed to write the base VDI" }, |
420 | {SD_RES_NO_TAG, "Failed to find the requested tag" }, |
421 | {SD_RES_STARTUP, "The system is still booting" }, |
422 | {SD_RES_VDI_NOT_LOCKED, "VDI isn't locked" }, |
423 | {SD_RES_SHUTDOWN, "The system is shutting down" }, |
424 | {SD_RES_NO_MEM, "Out of memory on the server" }, |
425 | {SD_RES_FULL_VDI, "We already have the maximum vdis" }, |
426 | {SD_RES_VER_MISMATCH, "Protocol version mismatch" }, |
427 | {SD_RES_NO_SPACE, "Server has no space for new objects" }, |
428 | {SD_RES_WAIT_FOR_FORMAT, "Sheepdog is waiting for a format operation" }, |
429 | {SD_RES_WAIT_FOR_JOIN, "Sheepdog is waiting for other nodes joining" }, |
430 | {SD_RES_JOIN_FAILED, "Target node had failed to join sheepdog" }, |
431 | {SD_RES_HALT, "Sheepdog is stopped serving IO request" }, |
432 | {SD_RES_READONLY, "Object is read-only" }, |
433 | }; |
434 | |
435 | for (i = 0; i < ARRAY_SIZE(errors); ++i) { |
436 | if (errors[i].err == err) { |
437 | return errors[i].desc; |
438 | } |
439 | } |
440 | |
441 | return "Invalid error code" ; |
442 | } |
443 | |
444 | /* |
445 | * Sheepdog I/O handling: |
446 | * |
447 | * 1. In sd_co_rw_vector, we send the I/O requests to the server and |
448 | * link the requests to the inflight_list in the |
449 | * BDRVSheepdogState. The function yields while waiting for |
450 | * receiving the response. |
451 | * |
452 | * 2. We receive the response in aio_read_response, the fd handler to |
453 | * the sheepdog connection. We switch back to sd_co_readv/sd_writev |
454 | * after all the requests belonging to the AIOCB are finished. If |
455 | * needed, sd_co_writev will send another requests for the vdi object. |
456 | */ |
457 | |
458 | static inline AIOReq *alloc_aio_req(BDRVSheepdogState *s, SheepdogAIOCB *acb, |
459 | uint64_t oid, unsigned int data_len, |
460 | uint64_t offset, uint8_t flags, bool create, |
461 | uint64_t base_oid, unsigned int iov_offset) |
462 | { |
463 | AIOReq *aio_req; |
464 | |
465 | aio_req = g_malloc(sizeof(*aio_req)); |
466 | aio_req->aiocb = acb; |
467 | aio_req->iov_offset = iov_offset; |
468 | aio_req->oid = oid; |
469 | aio_req->base_oid = base_oid; |
470 | aio_req->offset = offset; |
471 | aio_req->data_len = data_len; |
472 | aio_req->flags = flags; |
473 | aio_req->id = s->aioreq_seq_num++; |
474 | aio_req->create = create; |
475 | |
476 | acb->nr_pending++; |
477 | return aio_req; |
478 | } |
479 | |
480 | static void wait_for_overlapping_aiocb(BDRVSheepdogState *s, SheepdogAIOCB *acb) |
481 | { |
482 | SheepdogAIOCB *cb; |
483 | |
484 | retry: |
485 | QLIST_FOREACH(cb, &s->inflight_aiocb_head, aiocb_siblings) { |
486 | if (AIOCBOverlapping(acb, cb)) { |
487 | qemu_co_queue_wait(&s->overlapping_queue, &s->queue_lock); |
488 | goto retry; |
489 | } |
490 | } |
491 | } |
492 | |
493 | static void sd_aio_setup(SheepdogAIOCB *acb, BDRVSheepdogState *s, |
494 | QEMUIOVector *qiov, int64_t sector_num, int nb_sectors, |
495 | int type) |
496 | { |
497 | uint32_t object_size; |
498 | |
499 | object_size = (UINT32_C(1) << s->inode.block_size_shift); |
500 | |
501 | acb->s = s; |
502 | |
503 | acb->qiov = qiov; |
504 | |
505 | acb->sector_num = sector_num; |
506 | acb->nb_sectors = nb_sectors; |
507 | |
508 | acb->coroutine = qemu_coroutine_self(); |
509 | acb->ret = 0; |
510 | acb->nr_pending = 0; |
511 | |
512 | acb->min_affect_data_idx = acb->sector_num * BDRV_SECTOR_SIZE / object_size; |
513 | acb->max_affect_data_idx = (acb->sector_num * BDRV_SECTOR_SIZE + |
514 | acb->nb_sectors * BDRV_SECTOR_SIZE) / object_size; |
515 | |
516 | acb->min_dirty_data_idx = UINT32_MAX; |
517 | acb->max_dirty_data_idx = 0; |
518 | acb->aiocb_type = type; |
519 | |
520 | if (type == AIOCB_FLUSH_CACHE) { |
521 | return; |
522 | } |
523 | |
524 | qemu_co_mutex_lock(&s->queue_lock); |
525 | wait_for_overlapping_aiocb(s, acb); |
526 | QLIST_INSERT_HEAD(&s->inflight_aiocb_head, acb, aiocb_siblings); |
527 | qemu_co_mutex_unlock(&s->queue_lock); |
528 | } |
529 | |
530 | static SocketAddress *sd_server_config(QDict *options, Error **errp) |
531 | { |
532 | QDict *server = NULL; |
533 | Visitor *iv = NULL; |
534 | SocketAddress *saddr = NULL; |
535 | Error *local_err = NULL; |
536 | |
537 | qdict_extract_subqdict(options, &server, "server." ); |
538 | |
539 | iv = qobject_input_visitor_new_flat_confused(server, errp); |
540 | if (!iv) { |
541 | goto done; |
542 | } |
543 | |
544 | visit_type_SocketAddress(iv, NULL, &saddr, &local_err); |
545 | if (local_err) { |
546 | error_propagate(errp, local_err); |
547 | goto done; |
548 | } |
549 | |
550 | done: |
551 | visit_free(iv); |
552 | qobject_unref(server); |
553 | return saddr; |
554 | } |
555 | |
556 | /* Return -EIO in case of error, file descriptor on success */ |
557 | static int connect_to_sdog(BDRVSheepdogState *s, Error **errp) |
558 | { |
559 | int fd; |
560 | |
561 | fd = socket_connect(s->addr, errp); |
562 | |
563 | if (s->addr->type == SOCKET_ADDRESS_TYPE_INET && fd >= 0) { |
564 | int ret = socket_set_nodelay(fd); |
565 | if (ret < 0) { |
566 | warn_report("can't set TCP_NODELAY: %s" , strerror(errno)); |
567 | } |
568 | } |
569 | |
570 | if (fd >= 0) { |
571 | qemu_set_nonblock(fd); |
572 | } else { |
573 | fd = -EIO; |
574 | } |
575 | |
576 | return fd; |
577 | } |
578 | |
579 | /* Return 0 on success and -errno in case of error */ |
580 | static coroutine_fn int send_co_req(int sockfd, SheepdogReq *hdr, void *data, |
581 | unsigned int *wlen) |
582 | { |
583 | int ret; |
584 | |
585 | ret = qemu_co_send(sockfd, hdr, sizeof(*hdr)); |
586 | if (ret != sizeof(*hdr)) { |
587 | error_report("failed to send a req, %s" , strerror(errno)); |
588 | return -errno; |
589 | } |
590 | |
591 | ret = qemu_co_send(sockfd, data, *wlen); |
592 | if (ret != *wlen) { |
593 | error_report("failed to send a req, %s" , strerror(errno)); |
594 | return -errno; |
595 | } |
596 | |
597 | return ret; |
598 | } |
599 | |
600 | typedef struct SheepdogReqCo { |
601 | int sockfd; |
602 | BlockDriverState *bs; |
603 | AioContext *aio_context; |
604 | SheepdogReq *hdr; |
605 | void *data; |
606 | unsigned int *wlen; |
607 | unsigned int *rlen; |
608 | int ret; |
609 | bool finished; |
610 | Coroutine *co; |
611 | } SheepdogReqCo; |
612 | |
613 | static void restart_co_req(void *opaque) |
614 | { |
615 | SheepdogReqCo *srco = opaque; |
616 | |
617 | aio_co_wake(srco->co); |
618 | } |
619 | |
620 | static coroutine_fn void do_co_req(void *opaque) |
621 | { |
622 | int ret; |
623 | SheepdogReqCo *srco = opaque; |
624 | int sockfd = srco->sockfd; |
625 | SheepdogReq *hdr = srco->hdr; |
626 | void *data = srco->data; |
627 | unsigned int *wlen = srco->wlen; |
628 | unsigned int *rlen = srco->rlen; |
629 | |
630 | srco->co = qemu_coroutine_self(); |
631 | aio_set_fd_handler(srco->aio_context, sockfd, false, |
632 | NULL, restart_co_req, NULL, srco); |
633 | |
634 | ret = send_co_req(sockfd, hdr, data, wlen); |
635 | if (ret < 0) { |
636 | goto out; |
637 | } |
638 | |
639 | aio_set_fd_handler(srco->aio_context, sockfd, false, |
640 | restart_co_req, NULL, NULL, srco); |
641 | |
642 | ret = qemu_co_recv(sockfd, hdr, sizeof(*hdr)); |
643 | if (ret != sizeof(*hdr)) { |
644 | error_report("failed to get a rsp, %s" , strerror(errno)); |
645 | ret = -errno; |
646 | goto out; |
647 | } |
648 | |
649 | if (*rlen > hdr->data_length) { |
650 | *rlen = hdr->data_length; |
651 | } |
652 | |
653 | if (*rlen) { |
654 | ret = qemu_co_recv(sockfd, data, *rlen); |
655 | if (ret != *rlen) { |
656 | error_report("failed to get the data, %s" , strerror(errno)); |
657 | ret = -errno; |
658 | goto out; |
659 | } |
660 | } |
661 | ret = 0; |
662 | out: |
663 | /* there is at most one request for this sockfd, so it is safe to |
664 | * set each handler to NULL. */ |
665 | aio_set_fd_handler(srco->aio_context, sockfd, false, |
666 | NULL, NULL, NULL, NULL); |
667 | |
668 | srco->co = NULL; |
669 | srco->ret = ret; |
670 | /* Set srco->finished before reading bs->wakeup. */ |
671 | atomic_mb_set(&srco->finished, true); |
672 | if (srco->bs) { |
673 | bdrv_wakeup(srco->bs); |
674 | } |
675 | } |
676 | |
677 | /* |
678 | * Send the request to the sheep in a synchronous manner. |
679 | * |
680 | * Return 0 on success, -errno in case of error. |
681 | */ |
682 | static int do_req(int sockfd, BlockDriverState *bs, SheepdogReq *hdr, |
683 | void *data, unsigned int *wlen, unsigned int *rlen) |
684 | { |
685 | Coroutine *co; |
686 | SheepdogReqCo srco = { |
687 | .sockfd = sockfd, |
688 | .aio_context = bs ? bdrv_get_aio_context(bs) : qemu_get_aio_context(), |
689 | .bs = bs, |
690 | .hdr = hdr, |
691 | .data = data, |
692 | .wlen = wlen, |
693 | .rlen = rlen, |
694 | .ret = 0, |
695 | .finished = false, |
696 | }; |
697 | |
698 | if (qemu_in_coroutine()) { |
699 | do_co_req(&srco); |
700 | } else { |
701 | co = qemu_coroutine_create(do_co_req, &srco); |
702 | if (bs) { |
703 | bdrv_coroutine_enter(bs, co); |
704 | BDRV_POLL_WHILE(bs, !srco.finished); |
705 | } else { |
706 | qemu_coroutine_enter(co); |
707 | while (!srco.finished) { |
708 | aio_poll(qemu_get_aio_context(), true); |
709 | } |
710 | } |
711 | } |
712 | |
713 | return srco.ret; |
714 | } |
715 | |
716 | static void coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, |
717 | struct iovec *iov, int niov, |
718 | enum AIOCBState aiocb_type); |
719 | static void coroutine_fn resend_aioreq(BDRVSheepdogState *s, AIOReq *aio_req); |
720 | static int reload_inode(BDRVSheepdogState *s, uint32_t snapid, const char *tag); |
721 | static int get_sheep_fd(BDRVSheepdogState *s, Error **errp); |
722 | static void co_write_request(void *opaque); |
723 | |
724 | static coroutine_fn void reconnect_to_sdog(void *opaque) |
725 | { |
726 | BDRVSheepdogState *s = opaque; |
727 | AIOReq *aio_req, *next; |
728 | |
729 | aio_set_fd_handler(s->aio_context, s->fd, false, NULL, |
730 | NULL, NULL, NULL); |
731 | close(s->fd); |
732 | s->fd = -1; |
733 | |
734 | /* Wait for outstanding write requests to be completed. */ |
735 | while (s->co_send != NULL) { |
736 | co_write_request(opaque); |
737 | } |
738 | |
739 | /* Try to reconnect the sheepdog server every one second. */ |
740 | while (s->fd < 0) { |
741 | Error *local_err = NULL; |
742 | s->fd = get_sheep_fd(s, &local_err); |
743 | if (s->fd < 0) { |
744 | trace_sheepdog_reconnect_to_sdog(); |
745 | error_report_err(local_err); |
746 | qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, 1000000000ULL); |
747 | } |
748 | }; |
749 | |
750 | /* |
751 | * Now we have to resend all the request in the inflight queue. However, |
752 | * resend_aioreq() can yield and newly created requests can be added to the |
753 | * inflight queue before the coroutine is resumed. To avoid mixing them, we |
754 | * have to move all the inflight requests to the failed queue before |
755 | * resend_aioreq() is called. |
756 | */ |
757 | qemu_co_mutex_lock(&s->queue_lock); |
758 | QLIST_FOREACH_SAFE(aio_req, &s->inflight_aio_head, aio_siblings, next) { |
759 | QLIST_REMOVE(aio_req, aio_siblings); |
760 | QLIST_INSERT_HEAD(&s->failed_aio_head, aio_req, aio_siblings); |
761 | } |
762 | |
763 | /* Resend all the failed aio requests. */ |
764 | while (!QLIST_EMPTY(&s->failed_aio_head)) { |
765 | aio_req = QLIST_FIRST(&s->failed_aio_head); |
766 | QLIST_REMOVE(aio_req, aio_siblings); |
767 | qemu_co_mutex_unlock(&s->queue_lock); |
768 | resend_aioreq(s, aio_req); |
769 | qemu_co_mutex_lock(&s->queue_lock); |
770 | } |
771 | qemu_co_mutex_unlock(&s->queue_lock); |
772 | } |
773 | |
774 | /* |
775 | * Receive responses of the I/O requests. |
776 | * |
777 | * This function is registered as a fd handler, and called from the |
778 | * main loop when s->fd is ready for reading responses. |
779 | */ |
780 | static void coroutine_fn aio_read_response(void *opaque) |
781 | { |
782 | SheepdogObjRsp rsp; |
783 | BDRVSheepdogState *s = opaque; |
784 | int fd = s->fd; |
785 | int ret; |
786 | AIOReq *aio_req = NULL; |
787 | SheepdogAIOCB *acb; |
788 | uint64_t idx; |
789 | |
790 | /* read a header */ |
791 | ret = qemu_co_recv(fd, &rsp, sizeof(rsp)); |
792 | if (ret != sizeof(rsp)) { |
793 | error_report("failed to get the header, %s" , strerror(errno)); |
794 | goto err; |
795 | } |
796 | |
797 | /* find the right aio_req from the inflight aio list */ |
798 | QLIST_FOREACH(aio_req, &s->inflight_aio_head, aio_siblings) { |
799 | if (aio_req->id == rsp.id) { |
800 | break; |
801 | } |
802 | } |
803 | if (!aio_req) { |
804 | error_report("cannot find aio_req %x" , rsp.id); |
805 | goto err; |
806 | } |
807 | |
808 | acb = aio_req->aiocb; |
809 | |
810 | switch (acb->aiocb_type) { |
811 | case AIOCB_WRITE_UDATA: |
812 | if (!is_data_obj(aio_req->oid)) { |
813 | break; |
814 | } |
815 | idx = data_oid_to_idx(aio_req->oid); |
816 | |
817 | if (aio_req->create) { |
818 | /* |
819 | * If the object is newly created one, we need to update |
820 | * the vdi object (metadata object). min_dirty_data_idx |
821 | * and max_dirty_data_idx are changed to include updated |
822 | * index between them. |
823 | */ |
824 | if (rsp.result == SD_RES_SUCCESS) { |
825 | s->inode.data_vdi_id[idx] = s->inode.vdi_id; |
826 | acb->max_dirty_data_idx = MAX(idx, acb->max_dirty_data_idx); |
827 | acb->min_dirty_data_idx = MIN(idx, acb->min_dirty_data_idx); |
828 | } |
829 | } |
830 | break; |
831 | case AIOCB_READ_UDATA: |
832 | ret = qemu_co_recvv(fd, acb->qiov->iov, acb->qiov->niov, |
833 | aio_req->iov_offset, rsp.data_length); |
834 | if (ret != rsp.data_length) { |
835 | error_report("failed to get the data, %s" , strerror(errno)); |
836 | goto err; |
837 | } |
838 | break; |
839 | case AIOCB_FLUSH_CACHE: |
840 | if (rsp.result == SD_RES_INVALID_PARMS) { |
841 | trace_sheepdog_aio_read_response(); |
842 | s->cache_flags = SD_FLAG_CMD_DIRECT; |
843 | rsp.result = SD_RES_SUCCESS; |
844 | } |
845 | break; |
846 | case AIOCB_DISCARD_OBJ: |
847 | switch (rsp.result) { |
848 | case SD_RES_INVALID_PARMS: |
849 | error_report("server doesn't support discard command" ); |
850 | rsp.result = SD_RES_SUCCESS; |
851 | s->discard_supported = false; |
852 | break; |
853 | default: |
854 | break; |
855 | } |
856 | } |
857 | |
858 | /* No more data for this aio_req (reload_inode below uses its own file |
859 | * descriptor handler which doesn't use co_recv). |
860 | */ |
861 | s->co_recv = NULL; |
862 | |
863 | qemu_co_mutex_lock(&s->queue_lock); |
864 | QLIST_REMOVE(aio_req, aio_siblings); |
865 | qemu_co_mutex_unlock(&s->queue_lock); |
866 | |
867 | switch (rsp.result) { |
868 | case SD_RES_SUCCESS: |
869 | break; |
870 | case SD_RES_READONLY: |
871 | if (s->inode.vdi_id == oid_to_vid(aio_req->oid)) { |
872 | ret = reload_inode(s, 0, "" ); |
873 | if (ret < 0) { |
874 | goto err; |
875 | } |
876 | } |
877 | if (is_data_obj(aio_req->oid)) { |
878 | aio_req->oid = vid_to_data_oid(s->inode.vdi_id, |
879 | data_oid_to_idx(aio_req->oid)); |
880 | } else { |
881 | aio_req->oid = vid_to_vdi_oid(s->inode.vdi_id); |
882 | } |
883 | resend_aioreq(s, aio_req); |
884 | return; |
885 | default: |
886 | acb->ret = -EIO; |
887 | error_report("%s" , sd_strerror(rsp.result)); |
888 | break; |
889 | } |
890 | |
891 | g_free(aio_req); |
892 | |
893 | if (!--acb->nr_pending) { |
894 | /* |
895 | * We've finished all requests which belong to the AIOCB, so |
896 | * we can switch back to sd_co_readv/writev now. |
897 | */ |
898 | aio_co_wake(acb->coroutine); |
899 | } |
900 | |
901 | return; |
902 | |
903 | err: |
904 | reconnect_to_sdog(opaque); |
905 | } |
906 | |
907 | static void co_read_response(void *opaque) |
908 | { |
909 | BDRVSheepdogState *s = opaque; |
910 | |
911 | if (!s->co_recv) { |
912 | s->co_recv = qemu_coroutine_create(aio_read_response, opaque); |
913 | } |
914 | |
915 | aio_co_enter(s->aio_context, s->co_recv); |
916 | } |
917 | |
918 | static void co_write_request(void *opaque) |
919 | { |
920 | BDRVSheepdogState *s = opaque; |
921 | |
922 | aio_co_wake(s->co_send); |
923 | } |
924 | |
925 | /* |
926 | * Return a socket descriptor to read/write objects. |
927 | * |
928 | * We cannot use this descriptor for other operations because |
929 | * the block driver may be on waiting response from the server. |
930 | */ |
931 | static int get_sheep_fd(BDRVSheepdogState *s, Error **errp) |
932 | { |
933 | int fd; |
934 | |
935 | fd = connect_to_sdog(s, errp); |
936 | if (fd < 0) { |
937 | return fd; |
938 | } |
939 | |
940 | aio_set_fd_handler(s->aio_context, fd, false, |
941 | co_read_response, NULL, NULL, s); |
942 | return fd; |
943 | } |
944 | |
945 | /* |
946 | * Parse numeric snapshot ID in @str |
947 | * If @str can't be parsed as number, return false. |
948 | * Else, if the number is zero or too large, set *@snapid to zero and |
949 | * return true. |
950 | * Else, set *@snapid to the number and return true. |
951 | */ |
952 | static bool sd_parse_snapid(const char *str, uint32_t *snapid) |
953 | { |
954 | unsigned long ul; |
955 | int ret; |
956 | |
957 | ret = qemu_strtoul(str, NULL, 10, &ul); |
958 | if (ret == -ERANGE) { |
959 | ul = ret = 0; |
960 | } |
961 | if (ret) { |
962 | return false; |
963 | } |
964 | if (ul > UINT32_MAX) { |
965 | ul = 0; |
966 | } |
967 | |
968 | *snapid = ul; |
969 | return true; |
970 | } |
971 | |
972 | static bool sd_parse_snapid_or_tag(const char *str, |
973 | uint32_t *snapid, char tag[]) |
974 | { |
975 | if (!sd_parse_snapid(str, snapid)) { |
976 | *snapid = 0; |
977 | if (g_strlcpy(tag, str, SD_MAX_VDI_TAG_LEN) >= SD_MAX_VDI_TAG_LEN) { |
978 | return false; |
979 | } |
980 | } else if (!*snapid) { |
981 | return false; |
982 | } else { |
983 | tag[0] = 0; |
984 | } |
985 | return true; |
986 | } |
987 | |
988 | typedef struct { |
989 | const char *path; /* non-null iff transport is tcp */ |
990 | const char *host; /* valid when transport is tcp */ |
991 | int port; /* valid when transport is tcp */ |
992 | char vdi[SD_MAX_VDI_LEN]; |
993 | char tag[SD_MAX_VDI_TAG_LEN]; |
994 | uint32_t snap_id; |
995 | /* Remainder is only for sd_config_done() */ |
996 | URI *uri; |
997 | QueryParams *qp; |
998 | } SheepdogConfig; |
999 | |
1000 | static void sd_config_done(SheepdogConfig *cfg) |
1001 | { |
1002 | if (cfg->qp) { |
1003 | query_params_free(cfg->qp); |
1004 | } |
1005 | uri_free(cfg->uri); |
1006 | } |
1007 | |
1008 | static void sd_parse_uri(SheepdogConfig *cfg, const char *filename, |
1009 | Error **errp) |
1010 | { |
1011 | Error *err = NULL; |
1012 | QueryParams *qp = NULL; |
1013 | bool is_unix; |
1014 | URI *uri; |
1015 | |
1016 | memset(cfg, 0, sizeof(*cfg)); |
1017 | |
1018 | cfg->uri = uri = uri_parse(filename); |
1019 | if (!uri) { |
1020 | error_setg(&err, "invalid URI '%s'" , filename); |
1021 | goto out; |
1022 | } |
1023 | |
1024 | /* transport */ |
1025 | if (!g_strcmp0(uri->scheme, "sheepdog" )) { |
1026 | is_unix = false; |
1027 | } else if (!g_strcmp0(uri->scheme, "sheepdog+tcp" )) { |
1028 | is_unix = false; |
1029 | } else if (!g_strcmp0(uri->scheme, "sheepdog+unix" )) { |
1030 | is_unix = true; |
1031 | } else { |
1032 | error_setg(&err, "URI scheme must be 'sheepdog', 'sheepdog+tcp'," |
1033 | " or 'sheepdog+unix'" ); |
1034 | goto out; |
1035 | } |
1036 | |
1037 | if (uri->path == NULL || !strcmp(uri->path, "/" )) { |
1038 | error_setg(&err, "missing file path in URI" ); |
1039 | goto out; |
1040 | } |
1041 | if (g_strlcpy(cfg->vdi, uri->path + 1, SD_MAX_VDI_LEN) |
1042 | >= SD_MAX_VDI_LEN) { |
1043 | error_setg(&err, "VDI name is too long" ); |
1044 | goto out; |
1045 | } |
1046 | |
1047 | cfg->qp = qp = query_params_parse(uri->query); |
1048 | |
1049 | if (is_unix) { |
1050 | /* sheepdog+unix:///vdiname?socket=path */ |
1051 | if (uri->server || uri->port) { |
1052 | error_setg(&err, "URI scheme %s doesn't accept a server address" , |
1053 | uri->scheme); |
1054 | goto out; |
1055 | } |
1056 | if (!qp->n) { |
1057 | error_setg(&err, |
1058 | "URI scheme %s requires query parameter 'socket'" , |
1059 | uri->scheme); |
1060 | goto out; |
1061 | } |
1062 | if (qp->n != 1 || strcmp(qp->p[0].name, "socket" )) { |
1063 | error_setg(&err, "unexpected query parameters" ); |
1064 | goto out; |
1065 | } |
1066 | cfg->path = qp->p[0].value; |
1067 | } else { |
1068 | /* sheepdog[+tcp]://[host:port]/vdiname */ |
1069 | if (qp->n) { |
1070 | error_setg(&err, "unexpected query parameters" ); |
1071 | goto out; |
1072 | } |
1073 | cfg->host = uri->server; |
1074 | cfg->port = uri->port; |
1075 | } |
1076 | |
1077 | /* snapshot tag */ |
1078 | if (uri->fragment) { |
1079 | if (!sd_parse_snapid_or_tag(uri->fragment, |
1080 | &cfg->snap_id, cfg->tag)) { |
1081 | error_setg(&err, "'%s' is not a valid snapshot ID" , |
1082 | uri->fragment); |
1083 | goto out; |
1084 | } |
1085 | } else { |
1086 | cfg->snap_id = CURRENT_VDI_ID; /* search current vdi */ |
1087 | } |
1088 | |
1089 | out: |
1090 | if (err) { |
1091 | error_propagate(errp, err); |
1092 | sd_config_done(cfg); |
1093 | } |
1094 | } |
1095 | |
1096 | /* |
1097 | * Parse a filename (old syntax) |
1098 | * |
1099 | * filename must be one of the following formats: |
1100 | * 1. [vdiname] |
1101 | * 2. [vdiname]:[snapid] |
1102 | * 3. [vdiname]:[tag] |
1103 | * 4. [hostname]:[port]:[vdiname] |
1104 | * 5. [hostname]:[port]:[vdiname]:[snapid] |
1105 | * 6. [hostname]:[port]:[vdiname]:[tag] |
1106 | * |
1107 | * You can boot from the snapshot images by specifying `snapid` or |
1108 | * `tag'. |
1109 | * |
1110 | * You can run VMs outside the Sheepdog cluster by specifying |
1111 | * `hostname' and `port' (experimental). |
1112 | */ |
1113 | static void parse_vdiname(SheepdogConfig *cfg, const char *filename, |
1114 | Error **errp) |
1115 | { |
1116 | Error *err = NULL; |
1117 | char *p, *q, *uri; |
1118 | const char *host_spec, *vdi_spec; |
1119 | int nr_sep; |
1120 | |
1121 | strstart(filename, "sheepdog:" , &filename); |
1122 | p = q = g_strdup(filename); |
1123 | |
1124 | /* count the number of separators */ |
1125 | nr_sep = 0; |
1126 | while (*p) { |
1127 | if (*p == ':') { |
1128 | nr_sep++; |
1129 | } |
1130 | p++; |
1131 | } |
1132 | p = q; |
1133 | |
1134 | /* use the first two tokens as host_spec. */ |
1135 | if (nr_sep >= 2) { |
1136 | host_spec = p; |
1137 | p = strchr(p, ':'); |
1138 | p++; |
1139 | p = strchr(p, ':'); |
1140 | *p++ = '\0'; |
1141 | } else { |
1142 | host_spec = "" ; |
1143 | } |
1144 | |
1145 | vdi_spec = p; |
1146 | |
1147 | p = strchr(vdi_spec, ':'); |
1148 | if (p) { |
1149 | *p++ = '#'; |
1150 | } |
1151 | |
1152 | uri = g_strdup_printf("sheepdog://%s/%s" , host_spec, vdi_spec); |
1153 | |
1154 | /* |
1155 | * FIXME We to escape URI meta-characters, e.g. "x?y=z" |
1156 | * produces "sheepdog://x?y=z". Because of that ... |
1157 | */ |
1158 | sd_parse_uri(cfg, uri, &err); |
1159 | if (err) { |
1160 | /* |
1161 | * ... this can fail, but the error message is misleading. |
1162 | * Replace it by the traditional useless one until the |
1163 | * escaping is fixed. |
1164 | */ |
1165 | error_free(err); |
1166 | error_setg(errp, "Can't parse filename" ); |
1167 | } |
1168 | |
1169 | g_free(q); |
1170 | g_free(uri); |
1171 | } |
1172 | |
1173 | static void sd_parse_filename(const char *filename, QDict *options, |
1174 | Error **errp) |
1175 | { |
1176 | Error *err = NULL; |
1177 | SheepdogConfig cfg; |
1178 | char buf[32]; |
1179 | |
1180 | if (strstr(filename, "://" )) { |
1181 | sd_parse_uri(&cfg, filename, &err); |
1182 | } else { |
1183 | parse_vdiname(&cfg, filename, &err); |
1184 | } |
1185 | if (err) { |
1186 | error_propagate(errp, err); |
1187 | return; |
1188 | } |
1189 | |
1190 | if (cfg.path) { |
1191 | qdict_set_default_str(options, "server.path" , cfg.path); |
1192 | qdict_set_default_str(options, "server.type" , "unix" ); |
1193 | } else { |
1194 | qdict_set_default_str(options, "server.type" , "inet" ); |
1195 | qdict_set_default_str(options, "server.host" , |
1196 | cfg.host ?: SD_DEFAULT_ADDR); |
1197 | snprintf(buf, sizeof(buf), "%d" , cfg.port ?: SD_DEFAULT_PORT); |
1198 | qdict_set_default_str(options, "server.port" , buf); |
1199 | } |
1200 | qdict_set_default_str(options, "vdi" , cfg.vdi); |
1201 | qdict_set_default_str(options, "tag" , cfg.tag); |
1202 | if (cfg.snap_id) { |
1203 | snprintf(buf, sizeof(buf), "%d" , cfg.snap_id); |
1204 | qdict_set_default_str(options, "snap-id" , buf); |
1205 | } |
1206 | |
1207 | sd_config_done(&cfg); |
1208 | } |
1209 | |
1210 | static int find_vdi_name(BDRVSheepdogState *s, const char *filename, |
1211 | uint32_t snapid, const char *tag, uint32_t *vid, |
1212 | bool lock, Error **errp) |
1213 | { |
1214 | int ret, fd; |
1215 | SheepdogVdiReq hdr; |
1216 | SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; |
1217 | unsigned int wlen, rlen = 0; |
1218 | char buf[SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN] QEMU_NONSTRING; |
1219 | |
1220 | fd = connect_to_sdog(s, errp); |
1221 | if (fd < 0) { |
1222 | return fd; |
1223 | } |
1224 | |
1225 | /* This pair of strncpy calls ensures that the buffer is zero-filled, |
1226 | * which is desirable since we'll soon be sending those bytes, and |
1227 | * don't want the send_req to read uninitialized data. |
1228 | */ |
1229 | strncpy(buf, filename, SD_MAX_VDI_LEN); |
1230 | strncpy(buf + SD_MAX_VDI_LEN, tag, SD_MAX_VDI_TAG_LEN); |
1231 | |
1232 | memset(&hdr, 0, sizeof(hdr)); |
1233 | if (lock) { |
1234 | hdr.opcode = SD_OP_LOCK_VDI; |
1235 | hdr.type = LOCK_TYPE_NORMAL; |
1236 | } else { |
1237 | hdr.opcode = SD_OP_GET_VDI_INFO; |
1238 | } |
1239 | wlen = SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN; |
1240 | hdr.proto_ver = SD_PROTO_VER; |
1241 | hdr.data_length = wlen; |
1242 | hdr.snapid = snapid; |
1243 | hdr.flags = SD_FLAG_CMD_WRITE; |
1244 | |
1245 | ret = do_req(fd, s->bs, (SheepdogReq *)&hdr, buf, &wlen, &rlen); |
1246 | if (ret) { |
1247 | error_setg_errno(errp, -ret, "cannot get vdi info" ); |
1248 | goto out; |
1249 | } |
1250 | |
1251 | if (rsp->result != SD_RES_SUCCESS) { |
1252 | error_setg(errp, "cannot get vdi info, %s, %s %" PRIu32 " %s" , |
1253 | sd_strerror(rsp->result), filename, snapid, tag); |
1254 | if (rsp->result == SD_RES_NO_VDI) { |
1255 | ret = -ENOENT; |
1256 | } else if (rsp->result == SD_RES_VDI_LOCKED) { |
1257 | ret = -EBUSY; |
1258 | } else { |
1259 | ret = -EIO; |
1260 | } |
1261 | goto out; |
1262 | } |
1263 | *vid = rsp->vdi_id; |
1264 | |
1265 | ret = 0; |
1266 | out: |
1267 | closesocket(fd); |
1268 | return ret; |
1269 | } |
1270 | |
1271 | static void coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, |
1272 | struct iovec *iov, int niov, |
1273 | enum AIOCBState aiocb_type) |
1274 | { |
1275 | int nr_copies = s->inode.nr_copies; |
1276 | SheepdogObjReq hdr; |
1277 | unsigned int wlen = 0; |
1278 | int ret; |
1279 | uint64_t oid = aio_req->oid; |
1280 | unsigned int datalen = aio_req->data_len; |
1281 | uint64_t offset = aio_req->offset; |
1282 | uint8_t flags = aio_req->flags; |
1283 | uint64_t old_oid = aio_req->base_oid; |
1284 | bool create = aio_req->create; |
1285 | |
1286 | qemu_co_mutex_lock(&s->queue_lock); |
1287 | QLIST_INSERT_HEAD(&s->inflight_aio_head, aio_req, aio_siblings); |
1288 | qemu_co_mutex_unlock(&s->queue_lock); |
1289 | |
1290 | if (!nr_copies) { |
1291 | error_report("bug" ); |
1292 | } |
1293 | |
1294 | memset(&hdr, 0, sizeof(hdr)); |
1295 | |
1296 | switch (aiocb_type) { |
1297 | case AIOCB_FLUSH_CACHE: |
1298 | hdr.opcode = SD_OP_FLUSH_VDI; |
1299 | break; |
1300 | case AIOCB_READ_UDATA: |
1301 | hdr.opcode = SD_OP_READ_OBJ; |
1302 | hdr.flags = flags; |
1303 | break; |
1304 | case AIOCB_WRITE_UDATA: |
1305 | if (create) { |
1306 | hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ; |
1307 | } else { |
1308 | hdr.opcode = SD_OP_WRITE_OBJ; |
1309 | } |
1310 | wlen = datalen; |
1311 | hdr.flags = SD_FLAG_CMD_WRITE | flags; |
1312 | break; |
1313 | case AIOCB_DISCARD_OBJ: |
1314 | hdr.opcode = SD_OP_WRITE_OBJ; |
1315 | hdr.flags = SD_FLAG_CMD_WRITE | flags; |
1316 | s->inode.data_vdi_id[data_oid_to_idx(oid)] = 0; |
1317 | offset = offsetof(SheepdogInode, |
1318 | data_vdi_id[data_oid_to_idx(oid)]); |
1319 | oid = vid_to_vdi_oid(s->inode.vdi_id); |
1320 | wlen = datalen = sizeof(uint32_t); |
1321 | break; |
1322 | } |
1323 | |
1324 | if (s->cache_flags) { |
1325 | hdr.flags |= s->cache_flags; |
1326 | } |
1327 | |
1328 | hdr.oid = oid; |
1329 | hdr.cow_oid = old_oid; |
1330 | hdr.copies = s->inode.nr_copies; |
1331 | |
1332 | hdr.data_length = datalen; |
1333 | hdr.offset = offset; |
1334 | |
1335 | hdr.id = aio_req->id; |
1336 | |
1337 | qemu_co_mutex_lock(&s->lock); |
1338 | s->co_send = qemu_coroutine_self(); |
1339 | aio_set_fd_handler(s->aio_context, s->fd, false, |
1340 | co_read_response, co_write_request, NULL, s); |
1341 | socket_set_cork(s->fd, 1); |
1342 | |
1343 | /* send a header */ |
1344 | ret = qemu_co_send(s->fd, &hdr, sizeof(hdr)); |
1345 | if (ret != sizeof(hdr)) { |
1346 | error_report("failed to send a req, %s" , strerror(errno)); |
1347 | goto out; |
1348 | } |
1349 | |
1350 | if (wlen) { |
1351 | ret = qemu_co_sendv(s->fd, iov, niov, aio_req->iov_offset, wlen); |
1352 | if (ret != wlen) { |
1353 | error_report("failed to send a data, %s" , strerror(errno)); |
1354 | } |
1355 | } |
1356 | out: |
1357 | socket_set_cork(s->fd, 0); |
1358 | aio_set_fd_handler(s->aio_context, s->fd, false, |
1359 | co_read_response, NULL, NULL, s); |
1360 | s->co_send = NULL; |
1361 | qemu_co_mutex_unlock(&s->lock); |
1362 | } |
1363 | |
1364 | static int read_write_object(int fd, BlockDriverState *bs, char *buf, |
1365 | uint64_t oid, uint8_t copies, |
1366 | unsigned int datalen, uint64_t offset, |
1367 | bool write, bool create, uint32_t cache_flags) |
1368 | { |
1369 | SheepdogObjReq hdr; |
1370 | SheepdogObjRsp *rsp = (SheepdogObjRsp *)&hdr; |
1371 | unsigned int wlen, rlen; |
1372 | int ret; |
1373 | |
1374 | memset(&hdr, 0, sizeof(hdr)); |
1375 | |
1376 | if (write) { |
1377 | wlen = datalen; |
1378 | rlen = 0; |
1379 | hdr.flags = SD_FLAG_CMD_WRITE; |
1380 | if (create) { |
1381 | hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ; |
1382 | } else { |
1383 | hdr.opcode = SD_OP_WRITE_OBJ; |
1384 | } |
1385 | } else { |
1386 | wlen = 0; |
1387 | rlen = datalen; |
1388 | hdr.opcode = SD_OP_READ_OBJ; |
1389 | } |
1390 | |
1391 | hdr.flags |= cache_flags; |
1392 | |
1393 | hdr.oid = oid; |
1394 | hdr.data_length = datalen; |
1395 | hdr.offset = offset; |
1396 | hdr.copies = copies; |
1397 | |
1398 | ret = do_req(fd, bs, (SheepdogReq *)&hdr, buf, &wlen, &rlen); |
1399 | if (ret) { |
1400 | error_report("failed to send a request to the sheep" ); |
1401 | return ret; |
1402 | } |
1403 | |
1404 | switch (rsp->result) { |
1405 | case SD_RES_SUCCESS: |
1406 | return 0; |
1407 | default: |
1408 | error_report("%s" , sd_strerror(rsp->result)); |
1409 | return -EIO; |
1410 | } |
1411 | } |
1412 | |
1413 | static int read_object(int fd, BlockDriverState *bs, char *buf, |
1414 | uint64_t oid, uint8_t copies, |
1415 | unsigned int datalen, uint64_t offset, |
1416 | uint32_t cache_flags) |
1417 | { |
1418 | return read_write_object(fd, bs, buf, oid, copies, |
1419 | datalen, offset, false, |
1420 | false, cache_flags); |
1421 | } |
1422 | |
1423 | static int write_object(int fd, BlockDriverState *bs, char *buf, |
1424 | uint64_t oid, uint8_t copies, |
1425 | unsigned int datalen, uint64_t offset, bool create, |
1426 | uint32_t cache_flags) |
1427 | { |
1428 | return read_write_object(fd, bs, buf, oid, copies, |
1429 | datalen, offset, true, |
1430 | create, cache_flags); |
1431 | } |
1432 | |
1433 | /* update inode with the latest state */ |
1434 | static int reload_inode(BDRVSheepdogState *s, uint32_t snapid, const char *tag) |
1435 | { |
1436 | Error *local_err = NULL; |
1437 | SheepdogInode *inode; |
1438 | int ret = 0, fd; |
1439 | uint32_t vid = 0; |
1440 | |
1441 | fd = connect_to_sdog(s, &local_err); |
1442 | if (fd < 0) { |
1443 | error_report_err(local_err); |
1444 | return -EIO; |
1445 | } |
1446 | |
1447 | inode = g_malloc(SD_INODE_HEADER_SIZE); |
1448 | |
1449 | ret = find_vdi_name(s, s->name, snapid, tag, &vid, false, &local_err); |
1450 | if (ret) { |
1451 | error_report_err(local_err); |
1452 | goto out; |
1453 | } |
1454 | |
1455 | ret = read_object(fd, s->bs, (char *)inode, vid_to_vdi_oid(vid), |
1456 | s->inode.nr_copies, SD_INODE_HEADER_SIZE, 0, |
1457 | s->cache_flags); |
1458 | if (ret < 0) { |
1459 | goto out; |
1460 | } |
1461 | |
1462 | if (inode->vdi_id != s->inode.vdi_id) { |
1463 | memcpy(&s->inode, inode, SD_INODE_HEADER_SIZE); |
1464 | } |
1465 | |
1466 | out: |
1467 | g_free(inode); |
1468 | closesocket(fd); |
1469 | |
1470 | return ret; |
1471 | } |
1472 | |
1473 | static void coroutine_fn resend_aioreq(BDRVSheepdogState *s, AIOReq *aio_req) |
1474 | { |
1475 | SheepdogAIOCB *acb = aio_req->aiocb; |
1476 | |
1477 | aio_req->create = false; |
1478 | |
1479 | /* check whether this request becomes a CoW one */ |
1480 | if (acb->aiocb_type == AIOCB_WRITE_UDATA && is_data_obj(aio_req->oid)) { |
1481 | int idx = data_oid_to_idx(aio_req->oid); |
1482 | |
1483 | if (is_data_obj_writable(&s->inode, idx)) { |
1484 | goto out; |
1485 | } |
1486 | |
1487 | if (s->inode.data_vdi_id[idx]) { |
1488 | aio_req->base_oid = vid_to_data_oid(s->inode.data_vdi_id[idx], idx); |
1489 | aio_req->flags |= SD_FLAG_CMD_COW; |
1490 | } |
1491 | aio_req->create = true; |
1492 | } |
1493 | out: |
1494 | if (is_data_obj(aio_req->oid)) { |
1495 | add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov, |
1496 | acb->aiocb_type); |
1497 | } else { |
1498 | struct iovec iov; |
1499 | iov.iov_base = &s->inode; |
1500 | iov.iov_len = sizeof(s->inode); |
1501 | add_aio_request(s, aio_req, &iov, 1, AIOCB_WRITE_UDATA); |
1502 | } |
1503 | } |
1504 | |
1505 | static void sd_detach_aio_context(BlockDriverState *bs) |
1506 | { |
1507 | BDRVSheepdogState *s = bs->opaque; |
1508 | |
1509 | aio_set_fd_handler(s->aio_context, s->fd, false, NULL, |
1510 | NULL, NULL, NULL); |
1511 | } |
1512 | |
1513 | static void sd_attach_aio_context(BlockDriverState *bs, |
1514 | AioContext *new_context) |
1515 | { |
1516 | BDRVSheepdogState *s = bs->opaque; |
1517 | |
1518 | s->aio_context = new_context; |
1519 | aio_set_fd_handler(new_context, s->fd, false, |
1520 | co_read_response, NULL, NULL, s); |
1521 | } |
1522 | |
1523 | static QemuOptsList runtime_opts = { |
1524 | .name = "sheepdog" , |
1525 | .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), |
1526 | .desc = { |
1527 | { |
1528 | .name = "vdi" , |
1529 | .type = QEMU_OPT_STRING, |
1530 | }, |
1531 | { |
1532 | .name = "snap-id" , |
1533 | .type = QEMU_OPT_NUMBER, |
1534 | }, |
1535 | { |
1536 | .name = "tag" , |
1537 | .type = QEMU_OPT_STRING, |
1538 | }, |
1539 | { /* end of list */ } |
1540 | }, |
1541 | }; |
1542 | |
1543 | static int sd_open(BlockDriverState *bs, QDict *options, int flags, |
1544 | Error **errp) |
1545 | { |
1546 | int ret, fd; |
1547 | uint32_t vid = 0; |
1548 | BDRVSheepdogState *s = bs->opaque; |
1549 | const char *vdi, *snap_id_str, *tag; |
1550 | uint64_t snap_id; |
1551 | char *buf = NULL; |
1552 | QemuOpts *opts; |
1553 | Error *local_err = NULL; |
1554 | |
1555 | s->bs = bs; |
1556 | s->aio_context = bdrv_get_aio_context(bs); |
1557 | |
1558 | opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); |
1559 | qemu_opts_absorb_qdict(opts, options, &local_err); |
1560 | if (local_err) { |
1561 | error_propagate(errp, local_err); |
1562 | ret = -EINVAL; |
1563 | goto err_no_fd; |
1564 | } |
1565 | |
1566 | s->addr = sd_server_config(options, errp); |
1567 | if (!s->addr) { |
1568 | ret = -EINVAL; |
1569 | goto err_no_fd; |
1570 | } |
1571 | |
1572 | vdi = qemu_opt_get(opts, "vdi" ); |
1573 | snap_id_str = qemu_opt_get(opts, "snap-id" ); |
1574 | snap_id = qemu_opt_get_number(opts, "snap-id" , CURRENT_VDI_ID); |
1575 | tag = qemu_opt_get(opts, "tag" ); |
1576 | |
1577 | if (!vdi) { |
1578 | error_setg(errp, "parameter 'vdi' is missing" ); |
1579 | ret = -EINVAL; |
1580 | goto err_no_fd; |
1581 | } |
1582 | if (strlen(vdi) >= SD_MAX_VDI_LEN) { |
1583 | error_setg(errp, "value of parameter 'vdi' is too long" ); |
1584 | ret = -EINVAL; |
1585 | goto err_no_fd; |
1586 | } |
1587 | |
1588 | if (snap_id > UINT32_MAX) { |
1589 | snap_id = 0; |
1590 | } |
1591 | if (snap_id_str && !snap_id) { |
1592 | error_setg(errp, "'snap-id=%s' is not a valid snapshot ID" , |
1593 | snap_id_str); |
1594 | ret = -EINVAL; |
1595 | goto err_no_fd; |
1596 | } |
1597 | |
1598 | if (!tag) { |
1599 | tag = "" ; |
1600 | } |
1601 | if (strlen(tag) >= SD_MAX_VDI_TAG_LEN) { |
1602 | error_setg(errp, "value of parameter 'tag' is too long" ); |
1603 | ret = -EINVAL; |
1604 | goto err_no_fd; |
1605 | } |
1606 | |
1607 | QLIST_INIT(&s->inflight_aio_head); |
1608 | QLIST_INIT(&s->failed_aio_head); |
1609 | QLIST_INIT(&s->inflight_aiocb_head); |
1610 | |
1611 | s->fd = get_sheep_fd(s, errp); |
1612 | if (s->fd < 0) { |
1613 | ret = s->fd; |
1614 | goto err_no_fd; |
1615 | } |
1616 | |
1617 | ret = find_vdi_name(s, vdi, (uint32_t)snap_id, tag, &vid, true, errp); |
1618 | if (ret) { |
1619 | goto err; |
1620 | } |
1621 | |
1622 | /* |
1623 | * QEMU block layer emulates writethrough cache as 'writeback + flush', so |
1624 | * we always set SD_FLAG_CMD_CACHE (writeback cache) as default. |
1625 | */ |
1626 | s->cache_flags = SD_FLAG_CMD_CACHE; |
1627 | if (flags & BDRV_O_NOCACHE) { |
1628 | s->cache_flags = SD_FLAG_CMD_DIRECT; |
1629 | } |
1630 | s->discard_supported = true; |
1631 | |
1632 | if (snap_id || tag[0]) { |
1633 | trace_sheepdog_open(vid); |
1634 | s->is_snapshot = true; |
1635 | } |
1636 | |
1637 | fd = connect_to_sdog(s, errp); |
1638 | if (fd < 0) { |
1639 | ret = fd; |
1640 | goto err; |
1641 | } |
1642 | |
1643 | buf = g_malloc(SD_INODE_SIZE); |
1644 | ret = read_object(fd, s->bs, buf, vid_to_vdi_oid(vid), |
1645 | 0, SD_INODE_SIZE, 0, s->cache_flags); |
1646 | |
1647 | closesocket(fd); |
1648 | |
1649 | if (ret) { |
1650 | error_setg(errp, "Can't read snapshot inode" ); |
1651 | goto err; |
1652 | } |
1653 | |
1654 | memcpy(&s->inode, buf, sizeof(s->inode)); |
1655 | |
1656 | bs->total_sectors = s->inode.vdi_size / BDRV_SECTOR_SIZE; |
1657 | pstrcpy(s->name, sizeof(s->name), vdi); |
1658 | qemu_co_mutex_init(&s->lock); |
1659 | qemu_co_mutex_init(&s->queue_lock); |
1660 | qemu_co_queue_init(&s->overlapping_queue); |
1661 | qemu_opts_del(opts); |
1662 | g_free(buf); |
1663 | return 0; |
1664 | |
1665 | err: |
1666 | aio_set_fd_handler(bdrv_get_aio_context(bs), s->fd, |
1667 | false, NULL, NULL, NULL, NULL); |
1668 | closesocket(s->fd); |
1669 | err_no_fd: |
1670 | qemu_opts_del(opts); |
1671 | g_free(buf); |
1672 | return ret; |
1673 | } |
1674 | |
1675 | static int sd_reopen_prepare(BDRVReopenState *state, BlockReopenQueue *queue, |
1676 | Error **errp) |
1677 | { |
1678 | BDRVSheepdogState *s = state->bs->opaque; |
1679 | BDRVSheepdogReopenState *re_s; |
1680 | int ret = 0; |
1681 | |
1682 | re_s = state->opaque = g_new0(BDRVSheepdogReopenState, 1); |
1683 | |
1684 | re_s->cache_flags = SD_FLAG_CMD_CACHE; |
1685 | if (state->flags & BDRV_O_NOCACHE) { |
1686 | re_s->cache_flags = SD_FLAG_CMD_DIRECT; |
1687 | } |
1688 | |
1689 | re_s->fd = get_sheep_fd(s, errp); |
1690 | if (re_s->fd < 0) { |
1691 | ret = re_s->fd; |
1692 | return ret; |
1693 | } |
1694 | |
1695 | return ret; |
1696 | } |
1697 | |
1698 | static void sd_reopen_commit(BDRVReopenState *state) |
1699 | { |
1700 | BDRVSheepdogReopenState *re_s = state->opaque; |
1701 | BDRVSheepdogState *s = state->bs->opaque; |
1702 | |
1703 | if (s->fd) { |
1704 | aio_set_fd_handler(s->aio_context, s->fd, false, |
1705 | NULL, NULL, NULL, NULL); |
1706 | closesocket(s->fd); |
1707 | } |
1708 | |
1709 | s->fd = re_s->fd; |
1710 | s->cache_flags = re_s->cache_flags; |
1711 | |
1712 | g_free(state->opaque); |
1713 | state->opaque = NULL; |
1714 | |
1715 | return; |
1716 | } |
1717 | |
1718 | static void sd_reopen_abort(BDRVReopenState *state) |
1719 | { |
1720 | BDRVSheepdogReopenState *re_s = state->opaque; |
1721 | BDRVSheepdogState *s = state->bs->opaque; |
1722 | |
1723 | if (re_s == NULL) { |
1724 | return; |
1725 | } |
1726 | |
1727 | if (re_s->fd) { |
1728 | aio_set_fd_handler(s->aio_context, re_s->fd, false, |
1729 | NULL, NULL, NULL, NULL); |
1730 | closesocket(re_s->fd); |
1731 | } |
1732 | |
1733 | g_free(state->opaque); |
1734 | state->opaque = NULL; |
1735 | |
1736 | return; |
1737 | } |
1738 | |
1739 | static int do_sd_create(BDRVSheepdogState *s, uint32_t *vdi_id, int snapshot, |
1740 | Error **errp) |
1741 | { |
1742 | SheepdogVdiReq hdr; |
1743 | SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; |
1744 | int fd, ret; |
1745 | unsigned int wlen, rlen = 0; |
1746 | char buf[SD_MAX_VDI_LEN]; |
1747 | |
1748 | fd = connect_to_sdog(s, errp); |
1749 | if (fd < 0) { |
1750 | return fd; |
1751 | } |
1752 | |
1753 | /* FIXME: would it be better to fail (e.g., return -EIO) when filename |
1754 | * does not fit in buf? For now, just truncate and avoid buffer overrun. |
1755 | */ |
1756 | memset(buf, 0, sizeof(buf)); |
1757 | pstrcpy(buf, sizeof(buf), s->name); |
1758 | |
1759 | memset(&hdr, 0, sizeof(hdr)); |
1760 | hdr.opcode = SD_OP_NEW_VDI; |
1761 | hdr.base_vdi_id = s->inode.vdi_id; |
1762 | |
1763 | wlen = SD_MAX_VDI_LEN; |
1764 | |
1765 | hdr.flags = SD_FLAG_CMD_WRITE; |
1766 | hdr.snapid = snapshot; |
1767 | |
1768 | hdr.data_length = wlen; |
1769 | hdr.vdi_size = s->inode.vdi_size; |
1770 | hdr.copy_policy = s->inode.copy_policy; |
1771 | hdr.copies = s->inode.nr_copies; |
1772 | hdr.block_size_shift = s->inode.block_size_shift; |
1773 | |
1774 | ret = do_req(fd, NULL, (SheepdogReq *)&hdr, buf, &wlen, &rlen); |
1775 | |
1776 | closesocket(fd); |
1777 | |
1778 | if (ret) { |
1779 | error_setg_errno(errp, -ret, "create failed" ); |
1780 | return ret; |
1781 | } |
1782 | |
1783 | if (rsp->result != SD_RES_SUCCESS) { |
1784 | error_setg(errp, "%s, %s" , sd_strerror(rsp->result), s->inode.name); |
1785 | return -EIO; |
1786 | } |
1787 | |
1788 | if (vdi_id) { |
1789 | *vdi_id = rsp->vdi_id; |
1790 | } |
1791 | |
1792 | return 0; |
1793 | } |
1794 | |
1795 | static int sd_prealloc(BlockDriverState *bs, int64_t old_size, int64_t new_size, |
1796 | Error **errp) |
1797 | { |
1798 | BlockBackend *blk = NULL; |
1799 | BDRVSheepdogState *base = bs->opaque; |
1800 | unsigned long buf_size; |
1801 | uint32_t idx, max_idx; |
1802 | uint32_t object_size; |
1803 | void *buf = NULL; |
1804 | int ret; |
1805 | |
1806 | blk = blk_new(bdrv_get_aio_context(bs), |
1807 | BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE | BLK_PERM_RESIZE, |
1808 | BLK_PERM_ALL); |
1809 | |
1810 | ret = blk_insert_bs(blk, bs, errp); |
1811 | if (ret < 0) { |
1812 | goto out_with_err_set; |
1813 | } |
1814 | |
1815 | blk_set_allow_write_beyond_eof(blk, true); |
1816 | |
1817 | object_size = (UINT32_C(1) << base->inode.block_size_shift); |
1818 | buf_size = MIN(object_size, SD_DATA_OBJ_SIZE); |
1819 | buf = g_malloc0(buf_size); |
1820 | |
1821 | max_idx = DIV_ROUND_UP(new_size, buf_size); |
1822 | |
1823 | for (idx = old_size / buf_size; idx < max_idx; idx++) { |
1824 | /* |
1825 | * The created image can be a cloned image, so we need to read |
1826 | * a data from the source image. |
1827 | */ |
1828 | ret = blk_pread(blk, idx * buf_size, buf, buf_size); |
1829 | if (ret < 0) { |
1830 | goto out; |
1831 | } |
1832 | ret = blk_pwrite(blk, idx * buf_size, buf, buf_size, 0); |
1833 | if (ret < 0) { |
1834 | goto out; |
1835 | } |
1836 | } |
1837 | |
1838 | ret = 0; |
1839 | out: |
1840 | if (ret < 0) { |
1841 | error_setg_errno(errp, -ret, "Can't pre-allocate" ); |
1842 | } |
1843 | out_with_err_set: |
1844 | blk_unref(blk); |
1845 | g_free(buf); |
1846 | |
1847 | return ret; |
1848 | } |
1849 | |
1850 | static int sd_create_prealloc(BlockdevOptionsSheepdog *location, int64_t size, |
1851 | Error **errp) |
1852 | { |
1853 | BlockDriverState *bs; |
1854 | Visitor *v; |
1855 | QObject *obj = NULL; |
1856 | QDict *qdict; |
1857 | Error *local_err = NULL; |
1858 | int ret; |
1859 | |
1860 | v = qobject_output_visitor_new(&obj); |
1861 | visit_type_BlockdevOptionsSheepdog(v, NULL, &location, &local_err); |
1862 | visit_free(v); |
1863 | |
1864 | if (local_err) { |
1865 | error_propagate(errp, local_err); |
1866 | qobject_unref(obj); |
1867 | return -EINVAL; |
1868 | } |
1869 | |
1870 | qdict = qobject_to(QDict, obj); |
1871 | qdict_flatten(qdict); |
1872 | |
1873 | qdict_put_str(qdict, "driver" , "sheepdog" ); |
1874 | |
1875 | bs = bdrv_open(NULL, NULL, qdict, BDRV_O_PROTOCOL | BDRV_O_RDWR, errp); |
1876 | if (bs == NULL) { |
1877 | ret = -EIO; |
1878 | goto fail; |
1879 | } |
1880 | |
1881 | ret = sd_prealloc(bs, 0, size, errp); |
1882 | fail: |
1883 | bdrv_unref(bs); |
1884 | qobject_unref(qdict); |
1885 | return ret; |
1886 | } |
1887 | |
1888 | static int parse_redundancy(BDRVSheepdogState *s, SheepdogRedundancy *opt) |
1889 | { |
1890 | struct SheepdogInode *inode = &s->inode; |
1891 | |
1892 | switch (opt->type) { |
1893 | case SHEEPDOG_REDUNDANCY_TYPE_FULL: |
1894 | if (opt->u.full.copies > SD_MAX_COPIES || opt->u.full.copies < 1) { |
1895 | return -EINVAL; |
1896 | } |
1897 | inode->copy_policy = 0; |
1898 | inode->nr_copies = opt->u.full.copies; |
1899 | return 0; |
1900 | |
1901 | case SHEEPDOG_REDUNDANCY_TYPE_ERASURE_CODED: |
1902 | { |
1903 | int64_t copy = opt->u.erasure_coded.data_strips; |
1904 | int64_t parity = opt->u.erasure_coded.parity_strips; |
1905 | |
1906 | if (copy != 2 && copy != 4 && copy != 8 && copy != 16) { |
1907 | return -EINVAL; |
1908 | } |
1909 | |
1910 | if (parity >= SD_EC_MAX_STRIP || parity < 1) { |
1911 | return -EINVAL; |
1912 | } |
1913 | |
1914 | /* |
1915 | * 4 bits for parity and 4 bits for data. |
1916 | * We have to compress upper data bits because it can't represent 16 |
1917 | */ |
1918 | inode->copy_policy = ((copy / 2) << 4) + parity; |
1919 | inode->nr_copies = copy + parity; |
1920 | return 0; |
1921 | } |
1922 | |
1923 | default: |
1924 | g_assert_not_reached(); |
1925 | } |
1926 | |
1927 | return -EINVAL; |
1928 | } |
1929 | |
1930 | /* |
1931 | * Sheepdog support two kinds of redundancy, full replication and erasure |
1932 | * coding. |
1933 | * |
1934 | * # create a fully replicated vdi with x copies |
1935 | * -o redundancy=x (1 <= x <= SD_MAX_COPIES) |
1936 | * |
1937 | * # create a erasure coded vdi with x data strips and y parity strips |
1938 | * -o redundancy=x:y (x must be one of {2,4,8,16} and 1 <= y < SD_EC_MAX_STRIP) |
1939 | */ |
1940 | static SheepdogRedundancy *parse_redundancy_str(const char *opt) |
1941 | { |
1942 | SheepdogRedundancy *redundancy; |
1943 | const char *n1, *n2; |
1944 | long copy, parity; |
1945 | char p[10]; |
1946 | int ret; |
1947 | |
1948 | pstrcpy(p, sizeof(p), opt); |
1949 | n1 = strtok(p, ":" ); |
1950 | n2 = strtok(NULL, ":" ); |
1951 | |
1952 | if (!n1) { |
1953 | return NULL; |
1954 | } |
1955 | |
1956 | ret = qemu_strtol(n1, NULL, 10, ©); |
1957 | if (ret < 0) { |
1958 | return NULL; |
1959 | } |
1960 | |
1961 | redundancy = g_new0(SheepdogRedundancy, 1); |
1962 | if (!n2) { |
1963 | *redundancy = (SheepdogRedundancy) { |
1964 | .type = SHEEPDOG_REDUNDANCY_TYPE_FULL, |
1965 | .u.full.copies = copy, |
1966 | }; |
1967 | } else { |
1968 | ret = qemu_strtol(n2, NULL, 10, &parity); |
1969 | if (ret < 0) { |
1970 | g_free(redundancy); |
1971 | return NULL; |
1972 | } |
1973 | |
1974 | *redundancy = (SheepdogRedundancy) { |
1975 | .type = SHEEPDOG_REDUNDANCY_TYPE_ERASURE_CODED, |
1976 | .u.erasure_coded = { |
1977 | .data_strips = copy, |
1978 | .parity_strips = parity, |
1979 | }, |
1980 | }; |
1981 | } |
1982 | |
1983 | return redundancy; |
1984 | } |
1985 | |
1986 | static int parse_block_size_shift(BDRVSheepdogState *s, |
1987 | BlockdevCreateOptionsSheepdog *opts) |
1988 | { |
1989 | struct SheepdogInode *inode = &s->inode; |
1990 | uint64_t object_size; |
1991 | int obj_order; |
1992 | |
1993 | if (opts->has_object_size) { |
1994 | object_size = opts->object_size; |
1995 | |
1996 | if ((object_size - 1) & object_size) { /* not a power of 2? */ |
1997 | return -EINVAL; |
1998 | } |
1999 | obj_order = ctz32(object_size); |
2000 | if (obj_order < 20 || obj_order > 31) { |
2001 | return -EINVAL; |
2002 | } |
2003 | inode->block_size_shift = (uint8_t)obj_order; |
2004 | } |
2005 | |
2006 | return 0; |
2007 | } |
2008 | |
2009 | static int sd_co_create(BlockdevCreateOptions *options, Error **errp) |
2010 | { |
2011 | BlockdevCreateOptionsSheepdog *opts = &options->u.sheepdog; |
2012 | int ret = 0; |
2013 | uint32_t vid = 0; |
2014 | char *backing_file = NULL; |
2015 | char *buf = NULL; |
2016 | BDRVSheepdogState *s; |
2017 | uint64_t max_vdi_size; |
2018 | bool prealloc = false; |
2019 | |
2020 | assert(options->driver == BLOCKDEV_DRIVER_SHEEPDOG); |
2021 | |
2022 | s = g_new0(BDRVSheepdogState, 1); |
2023 | |
2024 | /* Steal SocketAddress from QAPI, set NULL to prevent double free */ |
2025 | s->addr = opts->location->server; |
2026 | opts->location->server = NULL; |
2027 | |
2028 | if (strlen(opts->location->vdi) >= sizeof(s->name)) { |
2029 | error_setg(errp, "'vdi' string too long" ); |
2030 | ret = -EINVAL; |
2031 | goto out; |
2032 | } |
2033 | pstrcpy(s->name, sizeof(s->name), opts->location->vdi); |
2034 | |
2035 | s->inode.vdi_size = opts->size; |
2036 | backing_file = opts->backing_file; |
2037 | |
2038 | if (!opts->has_preallocation) { |
2039 | opts->preallocation = PREALLOC_MODE_OFF; |
2040 | } |
2041 | switch (opts->preallocation) { |
2042 | case PREALLOC_MODE_OFF: |
2043 | prealloc = false; |
2044 | break; |
2045 | case PREALLOC_MODE_FULL: |
2046 | prealloc = true; |
2047 | break; |
2048 | default: |
2049 | error_setg(errp, "Preallocation mode not supported for Sheepdog" ); |
2050 | ret = -EINVAL; |
2051 | goto out; |
2052 | } |
2053 | |
2054 | if (opts->has_redundancy) { |
2055 | ret = parse_redundancy(s, opts->redundancy); |
2056 | if (ret < 0) { |
2057 | error_setg(errp, "Invalid redundancy mode" ); |
2058 | goto out; |
2059 | } |
2060 | } |
2061 | ret = parse_block_size_shift(s, opts); |
2062 | if (ret < 0) { |
2063 | error_setg(errp, "Invalid object_size." |
2064 | " obect_size needs to be power of 2" |
2065 | " and be limited from 2^20 to 2^31" ); |
2066 | goto out; |
2067 | } |
2068 | |
2069 | if (opts->has_backing_file) { |
2070 | BlockBackend *blk; |
2071 | BDRVSheepdogState *base; |
2072 | BlockDriver *drv; |
2073 | |
2074 | /* Currently, only Sheepdog backing image is supported. */ |
2075 | drv = bdrv_find_protocol(opts->backing_file, true, NULL); |
2076 | if (!drv || strcmp(drv->protocol_name, "sheepdog" ) != 0) { |
2077 | error_setg(errp, "backing_file must be a sheepdog image" ); |
2078 | ret = -EINVAL; |
2079 | goto out; |
2080 | } |
2081 | |
2082 | blk = blk_new_open(opts->backing_file, NULL, NULL, |
2083 | BDRV_O_PROTOCOL, errp); |
2084 | if (blk == NULL) { |
2085 | ret = -EIO; |
2086 | goto out; |
2087 | } |
2088 | |
2089 | base = blk_bs(blk)->opaque; |
2090 | |
2091 | if (!is_snapshot(&base->inode)) { |
2092 | error_setg(errp, "cannot clone from a non snapshot vdi" ); |
2093 | blk_unref(blk); |
2094 | ret = -EINVAL; |
2095 | goto out; |
2096 | } |
2097 | s->inode.vdi_id = base->inode.vdi_id; |
2098 | blk_unref(blk); |
2099 | } |
2100 | |
2101 | s->aio_context = qemu_get_aio_context(); |
2102 | |
2103 | /* if block_size_shift is not specified, get cluster default value */ |
2104 | if (s->inode.block_size_shift == 0) { |
2105 | SheepdogVdiReq hdr; |
2106 | SheepdogClusterRsp *rsp = (SheepdogClusterRsp *)&hdr; |
2107 | int fd; |
2108 | unsigned int wlen = 0, rlen = 0; |
2109 | |
2110 | fd = connect_to_sdog(s, errp); |
2111 | if (fd < 0) { |
2112 | ret = fd; |
2113 | goto out; |
2114 | } |
2115 | |
2116 | memset(&hdr, 0, sizeof(hdr)); |
2117 | hdr.opcode = SD_OP_GET_CLUSTER_DEFAULT; |
2118 | hdr.proto_ver = SD_PROTO_VER; |
2119 | |
2120 | ret = do_req(fd, NULL, (SheepdogReq *)&hdr, |
2121 | NULL, &wlen, &rlen); |
2122 | closesocket(fd); |
2123 | if (ret) { |
2124 | error_setg_errno(errp, -ret, "failed to get cluster default" ); |
2125 | goto out; |
2126 | } |
2127 | if (rsp->result == SD_RES_SUCCESS) { |
2128 | s->inode.block_size_shift = rsp->block_size_shift; |
2129 | } else { |
2130 | s->inode.block_size_shift = SD_DEFAULT_BLOCK_SIZE_SHIFT; |
2131 | } |
2132 | } |
2133 | |
2134 | max_vdi_size = (UINT64_C(1) << s->inode.block_size_shift) * MAX_DATA_OBJS; |
2135 | |
2136 | if (s->inode.vdi_size > max_vdi_size) { |
2137 | error_setg(errp, "An image is too large." |
2138 | " The maximum image size is %" PRIu64 "GB" , |
2139 | max_vdi_size / 1024 / 1024 / 1024); |
2140 | ret = -EINVAL; |
2141 | goto out; |
2142 | } |
2143 | |
2144 | ret = do_sd_create(s, &vid, 0, errp); |
2145 | if (ret) { |
2146 | goto out; |
2147 | } |
2148 | |
2149 | if (prealloc) { |
2150 | ret = sd_create_prealloc(opts->location, opts->size, errp); |
2151 | } |
2152 | out: |
2153 | g_free(backing_file); |
2154 | g_free(buf); |
2155 | g_free(s->addr); |
2156 | g_free(s); |
2157 | return ret; |
2158 | } |
2159 | |
2160 | static int coroutine_fn sd_co_create_opts(const char *filename, QemuOpts *opts, |
2161 | Error **errp) |
2162 | { |
2163 | BlockdevCreateOptions *create_options = NULL; |
2164 | QDict *qdict, *location_qdict; |
2165 | Visitor *v; |
2166 | char *redundancy; |
2167 | Error *local_err = NULL; |
2168 | int ret; |
2169 | |
2170 | redundancy = qemu_opt_get_del(opts, BLOCK_OPT_REDUNDANCY); |
2171 | |
2172 | qdict = qemu_opts_to_qdict(opts, NULL); |
2173 | qdict_put_str(qdict, "driver" , "sheepdog" ); |
2174 | |
2175 | location_qdict = qdict_new(); |
2176 | qdict_put(qdict, "location" , location_qdict); |
2177 | |
2178 | sd_parse_filename(filename, location_qdict, &local_err); |
2179 | if (local_err) { |
2180 | error_propagate(errp, local_err); |
2181 | ret = -EINVAL; |
2182 | goto fail; |
2183 | } |
2184 | |
2185 | qdict_flatten(qdict); |
2186 | |
2187 | /* Change legacy command line options into QMP ones */ |
2188 | static const QDictRenames opt_renames[] = { |
2189 | { BLOCK_OPT_BACKING_FILE, "backing-file" }, |
2190 | { BLOCK_OPT_OBJECT_SIZE, "object-size" }, |
2191 | { NULL, NULL }, |
2192 | }; |
2193 | |
2194 | if (!qdict_rename_keys(qdict, opt_renames, errp)) { |
2195 | ret = -EINVAL; |
2196 | goto fail; |
2197 | } |
2198 | |
2199 | /* Get the QAPI object */ |
2200 | v = qobject_input_visitor_new_flat_confused(qdict, errp); |
2201 | if (!v) { |
2202 | ret = -EINVAL; |
2203 | goto fail; |
2204 | } |
2205 | |
2206 | visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err); |
2207 | visit_free(v); |
2208 | |
2209 | if (local_err) { |
2210 | error_propagate(errp, local_err); |
2211 | ret = -EINVAL; |
2212 | goto fail; |
2213 | } |
2214 | |
2215 | assert(create_options->driver == BLOCKDEV_DRIVER_SHEEPDOG); |
2216 | create_options->u.sheepdog.size = |
2217 | ROUND_UP(create_options->u.sheepdog.size, BDRV_SECTOR_SIZE); |
2218 | |
2219 | if (redundancy) { |
2220 | create_options->u.sheepdog.has_redundancy = true; |
2221 | create_options->u.sheepdog.redundancy = |
2222 | parse_redundancy_str(redundancy); |
2223 | if (create_options->u.sheepdog.redundancy == NULL) { |
2224 | error_setg(errp, "Invalid redundancy mode" ); |
2225 | ret = -EINVAL; |
2226 | goto fail; |
2227 | } |
2228 | } |
2229 | |
2230 | ret = sd_co_create(create_options, errp); |
2231 | fail: |
2232 | qapi_free_BlockdevCreateOptions(create_options); |
2233 | qobject_unref(qdict); |
2234 | g_free(redundancy); |
2235 | return ret; |
2236 | } |
2237 | |
2238 | static void sd_close(BlockDriverState *bs) |
2239 | { |
2240 | Error *local_err = NULL; |
2241 | BDRVSheepdogState *s = bs->opaque; |
2242 | SheepdogVdiReq hdr; |
2243 | SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; |
2244 | unsigned int wlen, rlen = 0; |
2245 | int fd, ret; |
2246 | |
2247 | trace_sheepdog_close(s->name); |
2248 | |
2249 | fd = connect_to_sdog(s, &local_err); |
2250 | if (fd < 0) { |
2251 | error_report_err(local_err); |
2252 | return; |
2253 | } |
2254 | |
2255 | memset(&hdr, 0, sizeof(hdr)); |
2256 | |
2257 | hdr.opcode = SD_OP_RELEASE_VDI; |
2258 | hdr.type = LOCK_TYPE_NORMAL; |
2259 | hdr.base_vdi_id = s->inode.vdi_id; |
2260 | wlen = strlen(s->name) + 1; |
2261 | hdr.data_length = wlen; |
2262 | hdr.flags = SD_FLAG_CMD_WRITE; |
2263 | |
2264 | ret = do_req(fd, s->bs, (SheepdogReq *)&hdr, |
2265 | s->name, &wlen, &rlen); |
2266 | |
2267 | closesocket(fd); |
2268 | |
2269 | if (!ret && rsp->result != SD_RES_SUCCESS && |
2270 | rsp->result != SD_RES_VDI_NOT_LOCKED) { |
2271 | error_report("%s, %s" , sd_strerror(rsp->result), s->name); |
2272 | } |
2273 | |
2274 | aio_set_fd_handler(bdrv_get_aio_context(bs), s->fd, |
2275 | false, NULL, NULL, NULL, NULL); |
2276 | closesocket(s->fd); |
2277 | qapi_free_SocketAddress(s->addr); |
2278 | } |
2279 | |
2280 | static int64_t sd_getlength(BlockDriverState *bs) |
2281 | { |
2282 | BDRVSheepdogState *s = bs->opaque; |
2283 | |
2284 | return s->inode.vdi_size; |
2285 | } |
2286 | |
2287 | static int coroutine_fn sd_co_truncate(BlockDriverState *bs, int64_t offset, |
2288 | PreallocMode prealloc, Error **errp) |
2289 | { |
2290 | BDRVSheepdogState *s = bs->opaque; |
2291 | int ret, fd; |
2292 | unsigned int datalen; |
2293 | uint64_t max_vdi_size; |
2294 | int64_t old_size = s->inode.vdi_size; |
2295 | |
2296 | if (prealloc != PREALLOC_MODE_OFF && prealloc != PREALLOC_MODE_FULL) { |
2297 | error_setg(errp, "Unsupported preallocation mode '%s'" , |
2298 | PreallocMode_str(prealloc)); |
2299 | return -ENOTSUP; |
2300 | } |
2301 | |
2302 | max_vdi_size = (UINT64_C(1) << s->inode.block_size_shift) * MAX_DATA_OBJS; |
2303 | if (offset < old_size) { |
2304 | error_setg(errp, "shrinking is not supported" ); |
2305 | return -EINVAL; |
2306 | } else if (offset > max_vdi_size) { |
2307 | error_setg(errp, "too big image size" ); |
2308 | return -EINVAL; |
2309 | } |
2310 | |
2311 | fd = connect_to_sdog(s, errp); |
2312 | if (fd < 0) { |
2313 | return fd; |
2314 | } |
2315 | |
2316 | /* we don't need to update entire object */ |
2317 | datalen = SD_INODE_HEADER_SIZE; |
2318 | s->inode.vdi_size = offset; |
2319 | ret = write_object(fd, s->bs, (char *)&s->inode, |
2320 | vid_to_vdi_oid(s->inode.vdi_id), s->inode.nr_copies, |
2321 | datalen, 0, false, s->cache_flags); |
2322 | close(fd); |
2323 | |
2324 | if (ret < 0) { |
2325 | error_setg_errno(errp, -ret, "failed to update an inode" ); |
2326 | return ret; |
2327 | } |
2328 | |
2329 | if (prealloc == PREALLOC_MODE_FULL) { |
2330 | ret = sd_prealloc(bs, old_size, offset, errp); |
2331 | if (ret < 0) { |
2332 | return ret; |
2333 | } |
2334 | } |
2335 | |
2336 | return 0; |
2337 | } |
2338 | |
2339 | /* |
2340 | * This function is called after writing data objects. If we need to |
2341 | * update metadata, this sends a write request to the vdi object. |
2342 | */ |
2343 | static void coroutine_fn sd_write_done(SheepdogAIOCB *acb) |
2344 | { |
2345 | BDRVSheepdogState *s = acb->s; |
2346 | struct iovec iov; |
2347 | AIOReq *aio_req; |
2348 | uint32_t offset, data_len, mn, mx; |
2349 | |
2350 | mn = acb->min_dirty_data_idx; |
2351 | mx = acb->max_dirty_data_idx; |
2352 | if (mn <= mx) { |
2353 | /* we need to update the vdi object. */ |
2354 | ++acb->nr_pending; |
2355 | offset = sizeof(s->inode) - sizeof(s->inode.data_vdi_id) + |
2356 | mn * sizeof(s->inode.data_vdi_id[0]); |
2357 | data_len = (mx - mn + 1) * sizeof(s->inode.data_vdi_id[0]); |
2358 | |
2359 | acb->min_dirty_data_idx = UINT32_MAX; |
2360 | acb->max_dirty_data_idx = 0; |
2361 | |
2362 | iov.iov_base = &s->inode; |
2363 | iov.iov_len = sizeof(s->inode); |
2364 | aio_req = alloc_aio_req(s, acb, vid_to_vdi_oid(s->inode.vdi_id), |
2365 | data_len, offset, 0, false, 0, offset); |
2366 | add_aio_request(s, aio_req, &iov, 1, AIOCB_WRITE_UDATA); |
2367 | if (--acb->nr_pending) { |
2368 | qemu_coroutine_yield(); |
2369 | } |
2370 | } |
2371 | } |
2372 | |
2373 | /* Delete current working VDI on the snapshot chain */ |
2374 | static bool sd_delete(BDRVSheepdogState *s) |
2375 | { |
2376 | Error *local_err = NULL; |
2377 | unsigned int wlen = SD_MAX_VDI_LEN, rlen = 0; |
2378 | SheepdogVdiReq hdr = { |
2379 | .opcode = SD_OP_DEL_VDI, |
2380 | .base_vdi_id = s->inode.vdi_id, |
2381 | .data_length = wlen, |
2382 | .flags = SD_FLAG_CMD_WRITE, |
2383 | }; |
2384 | SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; |
2385 | int fd, ret; |
2386 | |
2387 | fd = connect_to_sdog(s, &local_err); |
2388 | if (fd < 0) { |
2389 | error_report_err(local_err); |
2390 | return false; |
2391 | } |
2392 | |
2393 | ret = do_req(fd, s->bs, (SheepdogReq *)&hdr, |
2394 | s->name, &wlen, &rlen); |
2395 | closesocket(fd); |
2396 | if (ret) { |
2397 | return false; |
2398 | } |
2399 | switch (rsp->result) { |
2400 | case SD_RES_NO_VDI: |
2401 | error_report("%s was already deleted" , s->name); |
2402 | /* fall through */ |
2403 | case SD_RES_SUCCESS: |
2404 | break; |
2405 | default: |
2406 | error_report("%s, %s" , sd_strerror(rsp->result), s->name); |
2407 | return false; |
2408 | } |
2409 | |
2410 | return true; |
2411 | } |
2412 | |
2413 | /* |
2414 | * Create a writable VDI from a snapshot |
2415 | */ |
2416 | static int sd_create_branch(BDRVSheepdogState *s) |
2417 | { |
2418 | Error *local_err = NULL; |
2419 | int ret, fd; |
2420 | uint32_t vid; |
2421 | char *buf; |
2422 | bool deleted; |
2423 | |
2424 | trace_sheepdog_create_branch_snapshot(s->inode.vdi_id); |
2425 | |
2426 | buf = g_malloc(SD_INODE_SIZE); |
2427 | |
2428 | /* |
2429 | * Even If deletion fails, we will just create extra snapshot based on |
2430 | * the working VDI which was supposed to be deleted. So no need to |
2431 | * false bail out. |
2432 | */ |
2433 | deleted = sd_delete(s); |
2434 | ret = do_sd_create(s, &vid, !deleted, &local_err); |
2435 | if (ret) { |
2436 | error_report_err(local_err); |
2437 | goto out; |
2438 | } |
2439 | |
2440 | trace_sheepdog_create_branch_created(vid); |
2441 | |
2442 | fd = connect_to_sdog(s, &local_err); |
2443 | if (fd < 0) { |
2444 | error_report_err(local_err); |
2445 | ret = fd; |
2446 | goto out; |
2447 | } |
2448 | |
2449 | ret = read_object(fd, s->bs, buf, vid_to_vdi_oid(vid), |
2450 | s->inode.nr_copies, SD_INODE_SIZE, 0, s->cache_flags); |
2451 | |
2452 | closesocket(fd); |
2453 | |
2454 | if (ret < 0) { |
2455 | goto out; |
2456 | } |
2457 | |
2458 | memcpy(&s->inode, buf, sizeof(s->inode)); |
2459 | |
2460 | s->is_snapshot = false; |
2461 | ret = 0; |
2462 | trace_sheepdog_create_branch_new(s->inode.vdi_id); |
2463 | |
2464 | out: |
2465 | g_free(buf); |
2466 | |
2467 | return ret; |
2468 | } |
2469 | |
2470 | /* |
2471 | * Send I/O requests to the server. |
2472 | * |
2473 | * This function sends requests to the server, links the requests to |
2474 | * the inflight_list in BDRVSheepdogState, and exits without |
2475 | * waiting the response. The responses are received in the |
2476 | * `aio_read_response' function which is called from the main loop as |
2477 | * a fd handler. |
2478 | * |
2479 | * Returns 1 when we need to wait a response, 0 when there is no sent |
2480 | * request and -errno in error cases. |
2481 | */ |
2482 | static void coroutine_fn sd_co_rw_vector(SheepdogAIOCB *acb) |
2483 | { |
2484 | int ret = 0; |
2485 | unsigned long len, done = 0, total = acb->nb_sectors * BDRV_SECTOR_SIZE; |
2486 | unsigned long idx; |
2487 | uint32_t object_size; |
2488 | uint64_t oid; |
2489 | uint64_t offset; |
2490 | BDRVSheepdogState *s = acb->s; |
2491 | SheepdogInode *inode = &s->inode; |
2492 | AIOReq *aio_req; |
2493 | |
2494 | if (acb->aiocb_type == AIOCB_WRITE_UDATA && s->is_snapshot) { |
2495 | /* |
2496 | * In the case we open the snapshot VDI, Sheepdog creates the |
2497 | * writable VDI when we do a write operation first. |
2498 | */ |
2499 | ret = sd_create_branch(s); |
2500 | if (ret) { |
2501 | acb->ret = -EIO; |
2502 | return; |
2503 | } |
2504 | } |
2505 | |
2506 | object_size = (UINT32_C(1) << inode->block_size_shift); |
2507 | idx = acb->sector_num * BDRV_SECTOR_SIZE / object_size; |
2508 | offset = (acb->sector_num * BDRV_SECTOR_SIZE) % object_size; |
2509 | |
2510 | /* |
2511 | * Make sure we don't free the aiocb before we are done with all requests. |
2512 | * This additional reference is dropped at the end of this function. |
2513 | */ |
2514 | acb->nr_pending++; |
2515 | |
2516 | while (done != total) { |
2517 | uint8_t flags = 0; |
2518 | uint64_t old_oid = 0; |
2519 | bool create = false; |
2520 | |
2521 | oid = vid_to_data_oid(inode->data_vdi_id[idx], idx); |
2522 | |
2523 | len = MIN(total - done, object_size - offset); |
2524 | |
2525 | switch (acb->aiocb_type) { |
2526 | case AIOCB_READ_UDATA: |
2527 | if (!inode->data_vdi_id[idx]) { |
2528 | qemu_iovec_memset(acb->qiov, done, 0, len); |
2529 | goto done; |
2530 | } |
2531 | break; |
2532 | case AIOCB_WRITE_UDATA: |
2533 | if (!inode->data_vdi_id[idx]) { |
2534 | create = true; |
2535 | } else if (!is_data_obj_writable(inode, idx)) { |
2536 | /* Copy-On-Write */ |
2537 | create = true; |
2538 | old_oid = oid; |
2539 | flags = SD_FLAG_CMD_COW; |
2540 | } |
2541 | break; |
2542 | case AIOCB_DISCARD_OBJ: |
2543 | /* |
2544 | * We discard the object only when the whole object is |
2545 | * 1) allocated 2) trimmed. Otherwise, simply skip it. |
2546 | */ |
2547 | if (len != object_size || inode->data_vdi_id[idx] == 0) { |
2548 | goto done; |
2549 | } |
2550 | break; |
2551 | default: |
2552 | break; |
2553 | } |
2554 | |
2555 | if (create) { |
2556 | trace_sheepdog_co_rw_vector_update(inode->vdi_id, oid, |
2557 | vid_to_data_oid(inode->data_vdi_id[idx], idx), |
2558 | idx); |
2559 | oid = vid_to_data_oid(inode->vdi_id, idx); |
2560 | trace_sheepdog_co_rw_vector_new(oid); |
2561 | } |
2562 | |
2563 | aio_req = alloc_aio_req(s, acb, oid, len, offset, flags, create, |
2564 | old_oid, |
2565 | acb->aiocb_type == AIOCB_DISCARD_OBJ ? |
2566 | 0 : done); |
2567 | add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov, |
2568 | acb->aiocb_type); |
2569 | done: |
2570 | offset = 0; |
2571 | idx++; |
2572 | done += len; |
2573 | } |
2574 | if (--acb->nr_pending) { |
2575 | qemu_coroutine_yield(); |
2576 | } |
2577 | } |
2578 | |
2579 | static void sd_aio_complete(SheepdogAIOCB *acb) |
2580 | { |
2581 | BDRVSheepdogState *s; |
2582 | if (acb->aiocb_type == AIOCB_FLUSH_CACHE) { |
2583 | return; |
2584 | } |
2585 | |
2586 | s = acb->s; |
2587 | qemu_co_mutex_lock(&s->queue_lock); |
2588 | QLIST_REMOVE(acb, aiocb_siblings); |
2589 | qemu_co_queue_restart_all(&s->overlapping_queue); |
2590 | qemu_co_mutex_unlock(&s->queue_lock); |
2591 | } |
2592 | |
2593 | static coroutine_fn int sd_co_writev(BlockDriverState *bs, int64_t sector_num, |
2594 | int nb_sectors, QEMUIOVector *qiov, |
2595 | int flags) |
2596 | { |
2597 | SheepdogAIOCB acb; |
2598 | int ret; |
2599 | int64_t offset = (sector_num + nb_sectors) * BDRV_SECTOR_SIZE; |
2600 | BDRVSheepdogState *s = bs->opaque; |
2601 | |
2602 | assert(!flags); |
2603 | if (offset > s->inode.vdi_size) { |
2604 | ret = sd_co_truncate(bs, offset, PREALLOC_MODE_OFF, NULL); |
2605 | if (ret < 0) { |
2606 | return ret; |
2607 | } |
2608 | } |
2609 | |
2610 | sd_aio_setup(&acb, s, qiov, sector_num, nb_sectors, AIOCB_WRITE_UDATA); |
2611 | sd_co_rw_vector(&acb); |
2612 | sd_write_done(&acb); |
2613 | sd_aio_complete(&acb); |
2614 | |
2615 | return acb.ret; |
2616 | } |
2617 | |
2618 | static coroutine_fn int sd_co_readv(BlockDriverState *bs, int64_t sector_num, |
2619 | int nb_sectors, QEMUIOVector *qiov) |
2620 | { |
2621 | SheepdogAIOCB acb; |
2622 | BDRVSheepdogState *s = bs->opaque; |
2623 | |
2624 | sd_aio_setup(&acb, s, qiov, sector_num, nb_sectors, AIOCB_READ_UDATA); |
2625 | sd_co_rw_vector(&acb); |
2626 | sd_aio_complete(&acb); |
2627 | |
2628 | return acb.ret; |
2629 | } |
2630 | |
2631 | static int coroutine_fn sd_co_flush_to_disk(BlockDriverState *bs) |
2632 | { |
2633 | BDRVSheepdogState *s = bs->opaque; |
2634 | SheepdogAIOCB acb; |
2635 | AIOReq *aio_req; |
2636 | |
2637 | if (s->cache_flags != SD_FLAG_CMD_CACHE) { |
2638 | return 0; |
2639 | } |
2640 | |
2641 | sd_aio_setup(&acb, s, NULL, 0, 0, AIOCB_FLUSH_CACHE); |
2642 | |
2643 | acb.nr_pending++; |
2644 | aio_req = alloc_aio_req(s, &acb, vid_to_vdi_oid(s->inode.vdi_id), |
2645 | 0, 0, 0, false, 0, 0); |
2646 | add_aio_request(s, aio_req, NULL, 0, acb.aiocb_type); |
2647 | |
2648 | if (--acb.nr_pending) { |
2649 | qemu_coroutine_yield(); |
2650 | } |
2651 | |
2652 | sd_aio_complete(&acb); |
2653 | return acb.ret; |
2654 | } |
2655 | |
2656 | static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info) |
2657 | { |
2658 | Error *local_err = NULL; |
2659 | BDRVSheepdogState *s = bs->opaque; |
2660 | int ret, fd; |
2661 | uint32_t new_vid; |
2662 | SheepdogInode *inode; |
2663 | unsigned int datalen; |
2664 | |
2665 | trace_sheepdog_snapshot_create_info(sn_info->name, sn_info->id_str, s->name, |
2666 | sn_info->vm_state_size, s->is_snapshot); |
2667 | |
2668 | if (s->is_snapshot) { |
2669 | error_report("You can't create a snapshot of a snapshot VDI, " |
2670 | "%s (%" PRIu32 ")." , s->name, s->inode.vdi_id); |
2671 | |
2672 | return -EINVAL; |
2673 | } |
2674 | |
2675 | trace_sheepdog_snapshot_create(sn_info->name, sn_info->id_str); |
2676 | |
2677 | s->inode.vm_state_size = sn_info->vm_state_size; |
2678 | s->inode.vm_clock_nsec = sn_info->vm_clock_nsec; |
2679 | /* It appears that inode.tag does not require a NUL terminator, |
2680 | * which means this use of strncpy is ok. |
2681 | */ |
2682 | strncpy(s->inode.tag, sn_info->name, sizeof(s->inode.tag)); |
2683 | /* we don't need to update entire object */ |
2684 | datalen = SD_INODE_HEADER_SIZE; |
2685 | inode = g_malloc(datalen); |
2686 | |
2687 | /* refresh inode. */ |
2688 | fd = connect_to_sdog(s, &local_err); |
2689 | if (fd < 0) { |
2690 | error_report_err(local_err); |
2691 | ret = fd; |
2692 | goto cleanup; |
2693 | } |
2694 | |
2695 | ret = write_object(fd, s->bs, (char *)&s->inode, |
2696 | vid_to_vdi_oid(s->inode.vdi_id), s->inode.nr_copies, |
2697 | datalen, 0, false, s->cache_flags); |
2698 | if (ret < 0) { |
2699 | error_report("failed to write snapshot's inode." ); |
2700 | goto cleanup; |
2701 | } |
2702 | |
2703 | ret = do_sd_create(s, &new_vid, 1, &local_err); |
2704 | if (ret < 0) { |
2705 | error_reportf_err(local_err, |
2706 | "failed to create inode for snapshot: " ); |
2707 | goto cleanup; |
2708 | } |
2709 | |
2710 | ret = read_object(fd, s->bs, (char *)inode, |
2711 | vid_to_vdi_oid(new_vid), s->inode.nr_copies, datalen, 0, |
2712 | s->cache_flags); |
2713 | |
2714 | if (ret < 0) { |
2715 | error_report("failed to read new inode info. %s" , strerror(errno)); |
2716 | goto cleanup; |
2717 | } |
2718 | |
2719 | memcpy(&s->inode, inode, datalen); |
2720 | trace_sheepdog_snapshot_create_inode(s->inode.name, s->inode.snap_id, |
2721 | s->inode.vdi_id); |
2722 | |
2723 | cleanup: |
2724 | g_free(inode); |
2725 | closesocket(fd); |
2726 | return ret; |
2727 | } |
2728 | |
2729 | /* |
2730 | * We implement rollback(loadvm) operation to the specified snapshot by |
2731 | * 1) switch to the snapshot |
2732 | * 2) rely on sd_create_branch to delete working VDI and |
2733 | * 3) create a new working VDI based on the specified snapshot |
2734 | */ |
2735 | static int sd_snapshot_goto(BlockDriverState *bs, const char *snapshot_id) |
2736 | { |
2737 | BDRVSheepdogState *s = bs->opaque; |
2738 | BDRVSheepdogState *old_s; |
2739 | char tag[SD_MAX_VDI_TAG_LEN]; |
2740 | uint32_t snapid = 0; |
2741 | int ret; |
2742 | |
2743 | if (!sd_parse_snapid_or_tag(snapshot_id, &snapid, tag)) { |
2744 | return -EINVAL; |
2745 | } |
2746 | |
2747 | old_s = g_new(BDRVSheepdogState, 1); |
2748 | |
2749 | memcpy(old_s, s, sizeof(BDRVSheepdogState)); |
2750 | |
2751 | ret = reload_inode(s, snapid, tag); |
2752 | if (ret) { |
2753 | goto out; |
2754 | } |
2755 | |
2756 | ret = sd_create_branch(s); |
2757 | if (ret) { |
2758 | goto out; |
2759 | } |
2760 | |
2761 | g_free(old_s); |
2762 | |
2763 | return 0; |
2764 | out: |
2765 | /* recover bdrv_sd_state */ |
2766 | memcpy(s, old_s, sizeof(BDRVSheepdogState)); |
2767 | g_free(old_s); |
2768 | |
2769 | error_report("failed to open. recover old bdrv_sd_state." ); |
2770 | |
2771 | return ret; |
2772 | } |
2773 | |
2774 | #define NR_BATCHED_DISCARD 128 |
2775 | |
2776 | static int remove_objects(BDRVSheepdogState *s, Error **errp) |
2777 | { |
2778 | int fd, i = 0, nr_objs = 0; |
2779 | int ret; |
2780 | SheepdogInode *inode = &s->inode; |
2781 | |
2782 | fd = connect_to_sdog(s, errp); |
2783 | if (fd < 0) { |
2784 | return fd; |
2785 | } |
2786 | |
2787 | nr_objs = count_data_objs(inode); |
2788 | while (i < nr_objs) { |
2789 | int start_idx, nr_filled_idx; |
2790 | |
2791 | while (i < nr_objs && !inode->data_vdi_id[i]) { |
2792 | i++; |
2793 | } |
2794 | start_idx = i; |
2795 | |
2796 | nr_filled_idx = 0; |
2797 | while (i < nr_objs && nr_filled_idx < NR_BATCHED_DISCARD) { |
2798 | if (inode->data_vdi_id[i]) { |
2799 | inode->data_vdi_id[i] = 0; |
2800 | nr_filled_idx++; |
2801 | } |
2802 | |
2803 | i++; |
2804 | } |
2805 | |
2806 | ret = write_object(fd, s->bs, |
2807 | (char *)&inode->data_vdi_id[start_idx], |
2808 | vid_to_vdi_oid(s->inode.vdi_id), inode->nr_copies, |
2809 | (i - start_idx) * sizeof(uint32_t), |
2810 | offsetof(struct SheepdogInode, |
2811 | data_vdi_id[start_idx]), |
2812 | false, s->cache_flags); |
2813 | if (ret < 0) { |
2814 | error_setg(errp, "Failed to discard snapshot inode" ); |
2815 | goto out; |
2816 | } |
2817 | } |
2818 | |
2819 | ret = 0; |
2820 | out: |
2821 | closesocket(fd); |
2822 | return ret; |
2823 | } |
2824 | |
2825 | static int sd_snapshot_delete(BlockDriverState *bs, |
2826 | const char *snapshot_id, |
2827 | const char *name, |
2828 | Error **errp) |
2829 | { |
2830 | /* |
2831 | * FIXME should delete the snapshot matching both @snapshot_id and |
2832 | * @name, but @name not used here |
2833 | */ |
2834 | unsigned long snap_id = 0; |
2835 | char snap_tag[SD_MAX_VDI_TAG_LEN]; |
2836 | int fd, ret; |
2837 | char buf[SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN]; |
2838 | BDRVSheepdogState *s = bs->opaque; |
2839 | unsigned int wlen = SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN, rlen = 0; |
2840 | uint32_t vid; |
2841 | SheepdogVdiReq hdr = { |
2842 | .opcode = SD_OP_DEL_VDI, |
2843 | .data_length = wlen, |
2844 | .flags = SD_FLAG_CMD_WRITE, |
2845 | }; |
2846 | SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; |
2847 | |
2848 | ret = remove_objects(s, errp); |
2849 | if (ret) { |
2850 | return ret; |
2851 | } |
2852 | |
2853 | memset(buf, 0, sizeof(buf)); |
2854 | memset(snap_tag, 0, sizeof(snap_tag)); |
2855 | pstrcpy(buf, SD_MAX_VDI_LEN, s->name); |
2856 | /* TODO Use sd_parse_snapid() once this mess is cleaned up */ |
2857 | ret = qemu_strtoul(snapshot_id, NULL, 10, &snap_id); |
2858 | if (ret || snap_id > UINT32_MAX) { |
2859 | /* |
2860 | * FIXME Since qemu_strtoul() returns -EINVAL when |
2861 | * @snapshot_id is null, @snapshot_id is mandatory. Correct |
2862 | * would be to require at least one of @snapshot_id and @name. |
2863 | */ |
2864 | error_setg(errp, "Invalid snapshot ID: %s" , |
2865 | snapshot_id ? snapshot_id : "<null>" ); |
2866 | return -EINVAL; |
2867 | } |
2868 | |
2869 | if (snap_id) { |
2870 | hdr.snapid = (uint32_t) snap_id; |
2871 | } else { |
2872 | /* FIXME I suspect we should use @name here */ |
2873 | /* FIXME don't truncate silently */ |
2874 | pstrcpy(snap_tag, sizeof(snap_tag), snapshot_id); |
2875 | pstrcpy(buf + SD_MAX_VDI_LEN, SD_MAX_VDI_TAG_LEN, snap_tag); |
2876 | } |
2877 | |
2878 | ret = find_vdi_name(s, s->name, snap_id, snap_tag, &vid, true, errp); |
2879 | if (ret) { |
2880 | return ret; |
2881 | } |
2882 | |
2883 | fd = connect_to_sdog(s, errp); |
2884 | if (fd < 0) { |
2885 | return fd; |
2886 | } |
2887 | |
2888 | ret = do_req(fd, s->bs, (SheepdogReq *)&hdr, |
2889 | buf, &wlen, &rlen); |
2890 | closesocket(fd); |
2891 | if (ret) { |
2892 | error_setg_errno(errp, -ret, "Couldn't send request to server" ); |
2893 | return ret; |
2894 | } |
2895 | |
2896 | switch (rsp->result) { |
2897 | case SD_RES_NO_VDI: |
2898 | error_setg(errp, "Can't find the snapshot" ); |
2899 | return -ENOENT; |
2900 | case SD_RES_SUCCESS: |
2901 | break; |
2902 | default: |
2903 | error_setg(errp, "%s" , sd_strerror(rsp->result)); |
2904 | return -EIO; |
2905 | } |
2906 | |
2907 | return 0; |
2908 | } |
2909 | |
2910 | static int sd_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab) |
2911 | { |
2912 | Error *local_err = NULL; |
2913 | BDRVSheepdogState *s = bs->opaque; |
2914 | SheepdogReq req; |
2915 | int fd, nr = 1024, ret, max = BITS_TO_LONGS(SD_NR_VDIS) * sizeof(long); |
2916 | QEMUSnapshotInfo *sn_tab = NULL; |
2917 | unsigned wlen, rlen; |
2918 | int found = 0; |
2919 | SheepdogInode *inode; |
2920 | unsigned long *vdi_inuse; |
2921 | unsigned int start_nr; |
2922 | uint64_t hval; |
2923 | uint32_t vid; |
2924 | |
2925 | vdi_inuse = g_malloc(max); |
2926 | inode = g_malloc(SD_INODE_HEADER_SIZE); |
2927 | |
2928 | fd = connect_to_sdog(s, &local_err); |
2929 | if (fd < 0) { |
2930 | error_report_err(local_err); |
2931 | ret = fd; |
2932 | goto out; |
2933 | } |
2934 | |
2935 | rlen = max; |
2936 | wlen = 0; |
2937 | |
2938 | memset(&req, 0, sizeof(req)); |
2939 | |
2940 | req.opcode = SD_OP_READ_VDIS; |
2941 | req.data_length = max; |
2942 | |
2943 | ret = do_req(fd, s->bs, &req, vdi_inuse, &wlen, &rlen); |
2944 | |
2945 | closesocket(fd); |
2946 | if (ret) { |
2947 | goto out; |
2948 | } |
2949 | |
2950 | sn_tab = g_new0(QEMUSnapshotInfo, nr); |
2951 | |
2952 | /* calculate a vdi id with hash function */ |
2953 | hval = fnv_64a_buf(s->name, strlen(s->name), FNV1A_64_INIT); |
2954 | start_nr = hval & (SD_NR_VDIS - 1); |
2955 | |
2956 | fd = connect_to_sdog(s, &local_err); |
2957 | if (fd < 0) { |
2958 | error_report_err(local_err); |
2959 | ret = fd; |
2960 | goto out; |
2961 | } |
2962 | |
2963 | for (vid = start_nr; found < nr; vid = (vid + 1) % SD_NR_VDIS) { |
2964 | if (!test_bit(vid, vdi_inuse)) { |
2965 | break; |
2966 | } |
2967 | |
2968 | /* we don't need to read entire object */ |
2969 | ret = read_object(fd, s->bs, (char *)inode, |
2970 | vid_to_vdi_oid(vid), |
2971 | 0, SD_INODE_HEADER_SIZE, 0, |
2972 | s->cache_flags); |
2973 | |
2974 | if (ret) { |
2975 | continue; |
2976 | } |
2977 | |
2978 | if (!strcmp(inode->name, s->name) && is_snapshot(inode)) { |
2979 | sn_tab[found].date_sec = inode->snap_ctime >> 32; |
2980 | sn_tab[found].date_nsec = inode->snap_ctime & 0xffffffff; |
2981 | sn_tab[found].vm_state_size = inode->vm_state_size; |
2982 | sn_tab[found].vm_clock_nsec = inode->vm_clock_nsec; |
2983 | |
2984 | snprintf(sn_tab[found].id_str, sizeof(sn_tab[found].id_str), |
2985 | "%" PRIu32, inode->snap_id); |
2986 | pstrcpy(sn_tab[found].name, |
2987 | MIN(sizeof(sn_tab[found].name), sizeof(inode->tag)), |
2988 | inode->tag); |
2989 | found++; |
2990 | } |
2991 | } |
2992 | |
2993 | closesocket(fd); |
2994 | out: |
2995 | *psn_tab = sn_tab; |
2996 | |
2997 | g_free(vdi_inuse); |
2998 | g_free(inode); |
2999 | |
3000 | if (ret < 0) { |
3001 | return ret; |
3002 | } |
3003 | |
3004 | return found; |
3005 | } |
3006 | |
3007 | static int do_load_save_vmstate(BDRVSheepdogState *s, uint8_t *data, |
3008 | int64_t pos, int size, int load) |
3009 | { |
3010 | Error *local_err = NULL; |
3011 | bool create; |
3012 | int fd, ret = 0, remaining = size; |
3013 | unsigned int data_len; |
3014 | uint64_t vmstate_oid; |
3015 | uint64_t offset; |
3016 | uint32_t vdi_index; |
3017 | uint32_t vdi_id = load ? s->inode.parent_vdi_id : s->inode.vdi_id; |
3018 | uint32_t object_size = (UINT32_C(1) << s->inode.block_size_shift); |
3019 | |
3020 | fd = connect_to_sdog(s, &local_err); |
3021 | if (fd < 0) { |
3022 | error_report_err(local_err); |
3023 | return fd; |
3024 | } |
3025 | |
3026 | while (remaining) { |
3027 | vdi_index = pos / object_size; |
3028 | offset = pos % object_size; |
3029 | |
3030 | data_len = MIN(remaining, object_size - offset); |
3031 | |
3032 | vmstate_oid = vid_to_vmstate_oid(vdi_id, vdi_index); |
3033 | |
3034 | create = (offset == 0); |
3035 | if (load) { |
3036 | ret = read_object(fd, s->bs, (char *)data, vmstate_oid, |
3037 | s->inode.nr_copies, data_len, offset, |
3038 | s->cache_flags); |
3039 | } else { |
3040 | ret = write_object(fd, s->bs, (char *)data, vmstate_oid, |
3041 | s->inode.nr_copies, data_len, offset, create, |
3042 | s->cache_flags); |
3043 | } |
3044 | |
3045 | if (ret < 0) { |
3046 | error_report("failed to save vmstate %s" , strerror(errno)); |
3047 | goto cleanup; |
3048 | } |
3049 | |
3050 | pos += data_len; |
3051 | data += data_len; |
3052 | remaining -= data_len; |
3053 | } |
3054 | ret = size; |
3055 | cleanup: |
3056 | closesocket(fd); |
3057 | return ret; |
3058 | } |
3059 | |
3060 | static int sd_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, |
3061 | int64_t pos) |
3062 | { |
3063 | BDRVSheepdogState *s = bs->opaque; |
3064 | void *buf; |
3065 | int ret; |
3066 | |
3067 | buf = qemu_blockalign(bs, qiov->size); |
3068 | qemu_iovec_to_buf(qiov, 0, buf, qiov->size); |
3069 | ret = do_load_save_vmstate(s, (uint8_t *) buf, pos, qiov->size, 0); |
3070 | qemu_vfree(buf); |
3071 | |
3072 | return ret; |
3073 | } |
3074 | |
3075 | static int sd_load_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, |
3076 | int64_t pos) |
3077 | { |
3078 | BDRVSheepdogState *s = bs->opaque; |
3079 | void *buf; |
3080 | int ret; |
3081 | |
3082 | buf = qemu_blockalign(bs, qiov->size); |
3083 | ret = do_load_save_vmstate(s, buf, pos, qiov->size, 1); |
3084 | qemu_iovec_from_buf(qiov, 0, buf, qiov->size); |
3085 | qemu_vfree(buf); |
3086 | |
3087 | return ret; |
3088 | } |
3089 | |
3090 | |
3091 | static coroutine_fn int sd_co_pdiscard(BlockDriverState *bs, int64_t offset, |
3092 | int bytes) |
3093 | { |
3094 | SheepdogAIOCB acb; |
3095 | BDRVSheepdogState *s = bs->opaque; |
3096 | QEMUIOVector discard_iov; |
3097 | struct iovec iov; |
3098 | uint32_t zero = 0; |
3099 | |
3100 | if (!s->discard_supported) { |
3101 | return 0; |
3102 | } |
3103 | |
3104 | memset(&discard_iov, 0, sizeof(discard_iov)); |
3105 | memset(&iov, 0, sizeof(iov)); |
3106 | iov.iov_base = &zero; |
3107 | iov.iov_len = sizeof(zero); |
3108 | discard_iov.iov = &iov; |
3109 | discard_iov.niov = 1; |
3110 | if (!QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE)) { |
3111 | return -ENOTSUP; |
3112 | } |
3113 | sd_aio_setup(&acb, s, &discard_iov, offset >> BDRV_SECTOR_BITS, |
3114 | bytes >> BDRV_SECTOR_BITS, AIOCB_DISCARD_OBJ); |
3115 | sd_co_rw_vector(&acb); |
3116 | sd_aio_complete(&acb); |
3117 | |
3118 | return acb.ret; |
3119 | } |
3120 | |
3121 | static coroutine_fn int |
3122 | sd_co_block_status(BlockDriverState *bs, bool want_zero, int64_t offset, |
3123 | int64_t bytes, int64_t *pnum, int64_t *map, |
3124 | BlockDriverState **file) |
3125 | { |
3126 | BDRVSheepdogState *s = bs->opaque; |
3127 | SheepdogInode *inode = &s->inode; |
3128 | uint32_t object_size = (UINT32_C(1) << inode->block_size_shift); |
3129 | unsigned long start = offset / object_size, |
3130 | end = DIV_ROUND_UP(offset + bytes, object_size); |
3131 | unsigned long idx; |
3132 | *map = offset; |
3133 | int ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; |
3134 | |
3135 | for (idx = start; idx < end; idx++) { |
3136 | if (inode->data_vdi_id[idx] == 0) { |
3137 | break; |
3138 | } |
3139 | } |
3140 | if (idx == start) { |
3141 | /* Get the longest length of unallocated sectors */ |
3142 | ret = 0; |
3143 | for (idx = start + 1; idx < end; idx++) { |
3144 | if (inode->data_vdi_id[idx] != 0) { |
3145 | break; |
3146 | } |
3147 | } |
3148 | } |
3149 | |
3150 | *pnum = (idx - start) * object_size; |
3151 | if (*pnum > bytes) { |
3152 | *pnum = bytes; |
3153 | } |
3154 | if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID) { |
3155 | *file = bs; |
3156 | } |
3157 | return ret; |
3158 | } |
3159 | |
3160 | static int64_t sd_get_allocated_file_size(BlockDriverState *bs) |
3161 | { |
3162 | BDRVSheepdogState *s = bs->opaque; |
3163 | SheepdogInode *inode = &s->inode; |
3164 | uint32_t object_size = (UINT32_C(1) << inode->block_size_shift); |
3165 | unsigned long i, last = DIV_ROUND_UP(inode->vdi_size, object_size); |
3166 | uint64_t size = 0; |
3167 | |
3168 | for (i = 0; i < last; i++) { |
3169 | if (inode->data_vdi_id[i] == 0) { |
3170 | continue; |
3171 | } |
3172 | size += object_size; |
3173 | } |
3174 | return size; |
3175 | } |
3176 | |
3177 | static QemuOptsList sd_create_opts = { |
3178 | .name = "sheepdog-create-opts" , |
3179 | .head = QTAILQ_HEAD_INITIALIZER(sd_create_opts.head), |
3180 | .desc = { |
3181 | { |
3182 | .name = BLOCK_OPT_SIZE, |
3183 | .type = QEMU_OPT_SIZE, |
3184 | .help = "Virtual disk size" |
3185 | }, |
3186 | { |
3187 | .name = BLOCK_OPT_BACKING_FILE, |
3188 | .type = QEMU_OPT_STRING, |
3189 | .help = "File name of a base image" |
3190 | }, |
3191 | { |
3192 | .name = BLOCK_OPT_PREALLOC, |
3193 | .type = QEMU_OPT_STRING, |
3194 | .help = "Preallocation mode (allowed values: off, full)" |
3195 | }, |
3196 | { |
3197 | .name = BLOCK_OPT_REDUNDANCY, |
3198 | .type = QEMU_OPT_STRING, |
3199 | .help = "Redundancy of the image" |
3200 | }, |
3201 | { |
3202 | .name = BLOCK_OPT_OBJECT_SIZE, |
3203 | .type = QEMU_OPT_SIZE, |
3204 | .help = "Object size of the image" |
3205 | }, |
3206 | { /* end of list */ } |
3207 | } |
3208 | }; |
3209 | |
3210 | static const char *const sd_strong_runtime_opts[] = { |
3211 | "vdi" , |
3212 | "snap-id" , |
3213 | "tag" , |
3214 | "server." , |
3215 | |
3216 | NULL |
3217 | }; |
3218 | |
3219 | static BlockDriver bdrv_sheepdog = { |
3220 | .format_name = "sheepdog" , |
3221 | .protocol_name = "sheepdog" , |
3222 | .instance_size = sizeof(BDRVSheepdogState), |
3223 | .bdrv_parse_filename = sd_parse_filename, |
3224 | .bdrv_file_open = sd_open, |
3225 | .bdrv_reopen_prepare = sd_reopen_prepare, |
3226 | .bdrv_reopen_commit = sd_reopen_commit, |
3227 | .bdrv_reopen_abort = sd_reopen_abort, |
3228 | .bdrv_close = sd_close, |
3229 | .bdrv_co_create = sd_co_create, |
3230 | .bdrv_co_create_opts = sd_co_create_opts, |
3231 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
3232 | .bdrv_has_zero_init_truncate = bdrv_has_zero_init_1, |
3233 | .bdrv_getlength = sd_getlength, |
3234 | .bdrv_get_allocated_file_size = sd_get_allocated_file_size, |
3235 | .bdrv_co_truncate = sd_co_truncate, |
3236 | |
3237 | .bdrv_co_readv = sd_co_readv, |
3238 | .bdrv_co_writev = sd_co_writev, |
3239 | .bdrv_co_flush_to_disk = sd_co_flush_to_disk, |
3240 | .bdrv_co_pdiscard = sd_co_pdiscard, |
3241 | .bdrv_co_block_status = sd_co_block_status, |
3242 | |
3243 | .bdrv_snapshot_create = sd_snapshot_create, |
3244 | .bdrv_snapshot_goto = sd_snapshot_goto, |
3245 | .bdrv_snapshot_delete = sd_snapshot_delete, |
3246 | .bdrv_snapshot_list = sd_snapshot_list, |
3247 | |
3248 | .bdrv_save_vmstate = sd_save_vmstate, |
3249 | .bdrv_load_vmstate = sd_load_vmstate, |
3250 | |
3251 | .bdrv_detach_aio_context = sd_detach_aio_context, |
3252 | .bdrv_attach_aio_context = sd_attach_aio_context, |
3253 | |
3254 | .create_opts = &sd_create_opts, |
3255 | .strong_runtime_opts = sd_strong_runtime_opts, |
3256 | }; |
3257 | |
3258 | static BlockDriver bdrv_sheepdog_tcp = { |
3259 | .format_name = "sheepdog" , |
3260 | .protocol_name = "sheepdog+tcp" , |
3261 | .instance_size = sizeof(BDRVSheepdogState), |
3262 | .bdrv_parse_filename = sd_parse_filename, |
3263 | .bdrv_file_open = sd_open, |
3264 | .bdrv_reopen_prepare = sd_reopen_prepare, |
3265 | .bdrv_reopen_commit = sd_reopen_commit, |
3266 | .bdrv_reopen_abort = sd_reopen_abort, |
3267 | .bdrv_close = sd_close, |
3268 | .bdrv_co_create = sd_co_create, |
3269 | .bdrv_co_create_opts = sd_co_create_opts, |
3270 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
3271 | .bdrv_getlength = sd_getlength, |
3272 | .bdrv_get_allocated_file_size = sd_get_allocated_file_size, |
3273 | .bdrv_co_truncate = sd_co_truncate, |
3274 | |
3275 | .bdrv_co_readv = sd_co_readv, |
3276 | .bdrv_co_writev = sd_co_writev, |
3277 | .bdrv_co_flush_to_disk = sd_co_flush_to_disk, |
3278 | .bdrv_co_pdiscard = sd_co_pdiscard, |
3279 | .bdrv_co_block_status = sd_co_block_status, |
3280 | |
3281 | .bdrv_snapshot_create = sd_snapshot_create, |
3282 | .bdrv_snapshot_goto = sd_snapshot_goto, |
3283 | .bdrv_snapshot_delete = sd_snapshot_delete, |
3284 | .bdrv_snapshot_list = sd_snapshot_list, |
3285 | |
3286 | .bdrv_save_vmstate = sd_save_vmstate, |
3287 | .bdrv_load_vmstate = sd_load_vmstate, |
3288 | |
3289 | .bdrv_detach_aio_context = sd_detach_aio_context, |
3290 | .bdrv_attach_aio_context = sd_attach_aio_context, |
3291 | |
3292 | .create_opts = &sd_create_opts, |
3293 | .strong_runtime_opts = sd_strong_runtime_opts, |
3294 | }; |
3295 | |
3296 | static BlockDriver bdrv_sheepdog_unix = { |
3297 | .format_name = "sheepdog" , |
3298 | .protocol_name = "sheepdog+unix" , |
3299 | .instance_size = sizeof(BDRVSheepdogState), |
3300 | .bdrv_parse_filename = sd_parse_filename, |
3301 | .bdrv_file_open = sd_open, |
3302 | .bdrv_reopen_prepare = sd_reopen_prepare, |
3303 | .bdrv_reopen_commit = sd_reopen_commit, |
3304 | .bdrv_reopen_abort = sd_reopen_abort, |
3305 | .bdrv_close = sd_close, |
3306 | .bdrv_co_create = sd_co_create, |
3307 | .bdrv_co_create_opts = sd_co_create_opts, |
3308 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
3309 | .bdrv_getlength = sd_getlength, |
3310 | .bdrv_get_allocated_file_size = sd_get_allocated_file_size, |
3311 | .bdrv_co_truncate = sd_co_truncate, |
3312 | |
3313 | .bdrv_co_readv = sd_co_readv, |
3314 | .bdrv_co_writev = sd_co_writev, |
3315 | .bdrv_co_flush_to_disk = sd_co_flush_to_disk, |
3316 | .bdrv_co_pdiscard = sd_co_pdiscard, |
3317 | .bdrv_co_block_status = sd_co_block_status, |
3318 | |
3319 | .bdrv_snapshot_create = sd_snapshot_create, |
3320 | .bdrv_snapshot_goto = sd_snapshot_goto, |
3321 | .bdrv_snapshot_delete = sd_snapshot_delete, |
3322 | .bdrv_snapshot_list = sd_snapshot_list, |
3323 | |
3324 | .bdrv_save_vmstate = sd_save_vmstate, |
3325 | .bdrv_load_vmstate = sd_load_vmstate, |
3326 | |
3327 | .bdrv_detach_aio_context = sd_detach_aio_context, |
3328 | .bdrv_attach_aio_context = sd_attach_aio_context, |
3329 | |
3330 | .create_opts = &sd_create_opts, |
3331 | .strong_runtime_opts = sd_strong_runtime_opts, |
3332 | }; |
3333 | |
3334 | static void bdrv_sheepdog_init(void) |
3335 | { |
3336 | bdrv_register(&bdrv_sheepdog); |
3337 | bdrv_register(&bdrv_sheepdog_tcp); |
3338 | bdrv_register(&bdrv_sheepdog_unix); |
3339 | } |
3340 | block_init(bdrv_sheepdog_init); |
3341 | |