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33b1db1c MK |
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 | */ | |
33b1db1c MK |
11 | |
12 | #include "qemu-common.h" | |
13 | #include "qemu-error.h" | |
14 | #include "qemu_socket.h" | |
15 | #include "block_int.h" | |
16 | ||
17 | #define SD_PROTO_VER 0x01 | |
18 | ||
19 | #define SD_DEFAULT_ADDR "localhost" | |
20 | #define SD_DEFAULT_PORT "7000" | |
21 | ||
22 | #define SD_OP_CREATE_AND_WRITE_OBJ 0x01 | |
23 | #define SD_OP_READ_OBJ 0x02 | |
24 | #define SD_OP_WRITE_OBJ 0x03 | |
25 | ||
26 | #define SD_OP_NEW_VDI 0x11 | |
27 | #define SD_OP_LOCK_VDI 0x12 | |
28 | #define SD_OP_RELEASE_VDI 0x13 | |
29 | #define SD_OP_GET_VDI_INFO 0x14 | |
30 | #define SD_OP_READ_VDIS 0x15 | |
31 | ||
32 | #define SD_FLAG_CMD_WRITE 0x01 | |
33 | #define SD_FLAG_CMD_COW 0x02 | |
34 | ||
35 | #define SD_RES_SUCCESS 0x00 /* Success */ | |
36 | #define SD_RES_UNKNOWN 0x01 /* Unknown error */ | |
37 | #define SD_RES_NO_OBJ 0x02 /* No object found */ | |
38 | #define SD_RES_EIO 0x03 /* I/O error */ | |
39 | #define SD_RES_VDI_EXIST 0x04 /* Vdi exists already */ | |
40 | #define SD_RES_INVALID_PARMS 0x05 /* Invalid parameters */ | |
41 | #define SD_RES_SYSTEM_ERROR 0x06 /* System error */ | |
42 | #define SD_RES_VDI_LOCKED 0x07 /* Vdi is locked */ | |
43 | #define SD_RES_NO_VDI 0x08 /* No vdi found */ | |
44 | #define SD_RES_NO_BASE_VDI 0x09 /* No base vdi found */ | |
45 | #define SD_RES_VDI_READ 0x0A /* Cannot read requested vdi */ | |
46 | #define SD_RES_VDI_WRITE 0x0B /* Cannot write requested vdi */ | |
47 | #define SD_RES_BASE_VDI_READ 0x0C /* Cannot read base vdi */ | |
48 | #define SD_RES_BASE_VDI_WRITE 0x0D /* Cannot write base vdi */ | |
49 | #define SD_RES_NO_TAG 0x0E /* Requested tag is not found */ | |
50 | #define SD_RES_STARTUP 0x0F /* Sheepdog is on starting up */ | |
51 | #define SD_RES_VDI_NOT_LOCKED 0x10 /* Vdi is not locked */ | |
52 | #define SD_RES_SHUTDOWN 0x11 /* Sheepdog is shutting down */ | |
53 | #define SD_RES_NO_MEM 0x12 /* Cannot allocate memory */ | |
54 | #define SD_RES_FULL_VDI 0x13 /* we already have the maximum vdis */ | |
55 | #define SD_RES_VER_MISMATCH 0x14 /* Protocol version mismatch */ | |
56 | #define SD_RES_NO_SPACE 0x15 /* Server has no room for new objects */ | |
57 | #define SD_RES_WAIT_FOR_FORMAT 0x16 /* Waiting for a format operation */ | |
58 | #define SD_RES_WAIT_FOR_JOIN 0x17 /* Waiting for other nodes joining */ | |
59 | #define SD_RES_JOIN_FAILED 0x18 /* Target node had failed to join sheepdog */ | |
60 | ||
61 | /* | |
62 | * Object ID rules | |
63 | * | |
64 | * 0 - 19 (20 bits): data object space | |
65 | * 20 - 31 (12 bits): reserved data object space | |
66 | * 32 - 55 (24 bits): vdi object space | |
67 | * 56 - 59 ( 4 bits): reserved vdi object space | |
68 | * 60 - 63 ( 4 bits): object type indentifier space | |
69 | */ | |
70 | ||
71 | #define VDI_SPACE_SHIFT 32 | |
72 | #define VDI_BIT (UINT64_C(1) << 63) | |
73 | #define VMSTATE_BIT (UINT64_C(1) << 62) | |
74 | #define MAX_DATA_OBJS (UINT64_C(1) << 20) | |
75 | #define MAX_CHILDREN 1024 | |
76 | #define SD_MAX_VDI_LEN 256 | |
77 | #define SD_MAX_VDI_TAG_LEN 256 | |
78 | #define SD_NR_VDIS (1U << 24) | |
79 | #define SD_DATA_OBJ_SIZE (UINT64_C(1) << 22) | |
80 | #define SD_MAX_VDI_SIZE (SD_DATA_OBJ_SIZE * MAX_DATA_OBJS) | |
81 | #define SECTOR_SIZE 512 | |
82 | ||
83 | #define SD_INODE_SIZE (sizeof(SheepdogInode)) | |
84 | #define CURRENT_VDI_ID 0 | |
85 | ||
86 | typedef struct SheepdogReq { | |
87 | uint8_t proto_ver; | |
88 | uint8_t opcode; | |
89 | uint16_t flags; | |
90 | uint32_t epoch; | |
91 | uint32_t id; | |
92 | uint32_t data_length; | |
93 | uint32_t opcode_specific[8]; | |
94 | } SheepdogReq; | |
95 | ||
96 | typedef struct SheepdogRsp { | |
97 | uint8_t proto_ver; | |
98 | uint8_t opcode; | |
99 | uint16_t flags; | |
100 | uint32_t epoch; | |
101 | uint32_t id; | |
102 | uint32_t data_length; | |
103 | uint32_t result; | |
104 | uint32_t opcode_specific[7]; | |
105 | } SheepdogRsp; | |
106 | ||
107 | typedef struct SheepdogObjReq { | |
108 | uint8_t proto_ver; | |
109 | uint8_t opcode; | |
110 | uint16_t flags; | |
111 | uint32_t epoch; | |
112 | uint32_t id; | |
113 | uint32_t data_length; | |
114 | uint64_t oid; | |
115 | uint64_t cow_oid; | |
116 | uint32_t copies; | |
117 | uint32_t rsvd; | |
118 | uint64_t offset; | |
119 | } SheepdogObjReq; | |
120 | ||
121 | typedef struct SheepdogObjRsp { | |
122 | uint8_t proto_ver; | |
123 | uint8_t opcode; | |
124 | uint16_t flags; | |
125 | uint32_t epoch; | |
126 | uint32_t id; | |
127 | uint32_t data_length; | |
128 | uint32_t result; | |
129 | uint32_t copies; | |
130 | uint32_t pad[6]; | |
131 | } SheepdogObjRsp; | |
132 | ||
133 | typedef struct SheepdogVdiReq { | |
134 | uint8_t proto_ver; | |
135 | uint8_t opcode; | |
136 | uint16_t flags; | |
137 | uint32_t epoch; | |
138 | uint32_t id; | |
139 | uint32_t data_length; | |
140 | uint64_t vdi_size; | |
141 | uint32_t base_vdi_id; | |
142 | uint32_t copies; | |
143 | uint32_t snapid; | |
144 | uint32_t pad[3]; | |
145 | } SheepdogVdiReq; | |
146 | ||
147 | typedef struct SheepdogVdiRsp { | |
148 | uint8_t proto_ver; | |
149 | uint8_t opcode; | |
150 | uint16_t flags; | |
151 | uint32_t epoch; | |
152 | uint32_t id; | |
153 | uint32_t data_length; | |
154 | uint32_t result; | |
155 | uint32_t rsvd; | |
156 | uint32_t vdi_id; | |
157 | uint32_t pad[5]; | |
158 | } SheepdogVdiRsp; | |
159 | ||
160 | typedef struct SheepdogInode { | |
161 | char name[SD_MAX_VDI_LEN]; | |
162 | char tag[SD_MAX_VDI_TAG_LEN]; | |
163 | uint64_t ctime; | |
164 | uint64_t snap_ctime; | |
165 | uint64_t vm_clock_nsec; | |
166 | uint64_t vdi_size; | |
167 | uint64_t vm_state_size; | |
168 | uint16_t copy_policy; | |
169 | uint8_t nr_copies; | |
170 | uint8_t block_size_shift; | |
171 | uint32_t snap_id; | |
172 | uint32_t vdi_id; | |
173 | uint32_t parent_vdi_id; | |
174 | uint32_t child_vdi_id[MAX_CHILDREN]; | |
175 | uint32_t data_vdi_id[MAX_DATA_OBJS]; | |
176 | } SheepdogInode; | |
177 | ||
178 | /* | |
179 | * 64 bit FNV-1a non-zero initial basis | |
180 | */ | |
181 | #define FNV1A_64_INIT ((uint64_t)0xcbf29ce484222325ULL) | |
182 | ||
183 | /* | |
184 | * 64 bit Fowler/Noll/Vo FNV-1a hash code | |
185 | */ | |
186 | static inline uint64_t fnv_64a_buf(void *buf, size_t len, uint64_t hval) | |
187 | { | |
188 | unsigned char *bp = buf; | |
189 | unsigned char *be = bp + len; | |
190 | while (bp < be) { | |
191 | hval ^= (uint64_t) *bp++; | |
192 | hval += (hval << 1) + (hval << 4) + (hval << 5) + | |
193 | (hval << 7) + (hval << 8) + (hval << 40); | |
194 | } | |
195 | return hval; | |
196 | } | |
197 | ||
198 | static inline int is_data_obj_writeable(SheepdogInode *inode, unsigned int idx) | |
199 | { | |
200 | return inode->vdi_id == inode->data_vdi_id[idx]; | |
201 | } | |
202 | ||
203 | static inline int is_data_obj(uint64_t oid) | |
204 | { | |
205 | return !(VDI_BIT & oid); | |
206 | } | |
207 | ||
208 | static inline uint64_t data_oid_to_idx(uint64_t oid) | |
209 | { | |
210 | return oid & (MAX_DATA_OBJS - 1); | |
211 | } | |
212 | ||
213 | static inline uint64_t vid_to_vdi_oid(uint32_t vid) | |
214 | { | |
215 | return VDI_BIT | ((uint64_t)vid << VDI_SPACE_SHIFT); | |
216 | } | |
217 | ||
218 | static inline uint64_t vid_to_vmstate_oid(uint32_t vid, uint32_t idx) | |
219 | { | |
220 | return VMSTATE_BIT | ((uint64_t)vid << VDI_SPACE_SHIFT) | idx; | |
221 | } | |
222 | ||
223 | static inline uint64_t vid_to_data_oid(uint32_t vid, uint32_t idx) | |
224 | { | |
225 | return ((uint64_t)vid << VDI_SPACE_SHIFT) | idx; | |
226 | } | |
227 | ||
228 | static inline int is_snapshot(struct SheepdogInode *inode) | |
229 | { | |
230 | return !!inode->snap_ctime; | |
231 | } | |
232 | ||
233 | #undef dprintf | |
234 | #ifdef DEBUG_SDOG | |
235 | #define dprintf(fmt, args...) \ | |
236 | do { \ | |
237 | fprintf(stdout, "%s %d: " fmt, __func__, __LINE__, ##args); \ | |
238 | } while (0) | |
239 | #else | |
240 | #define dprintf(fmt, args...) | |
241 | #endif | |
242 | ||
243 | typedef struct SheepdogAIOCB SheepdogAIOCB; | |
244 | ||
245 | typedef struct AIOReq { | |
246 | SheepdogAIOCB *aiocb; | |
247 | unsigned int iov_offset; | |
248 | ||
249 | uint64_t oid; | |
250 | uint64_t base_oid; | |
251 | uint64_t offset; | |
252 | unsigned int data_len; | |
253 | uint8_t flags; | |
254 | uint32_t id; | |
255 | ||
256 | QLIST_ENTRY(AIOReq) outstanding_aio_siblings; | |
257 | QLIST_ENTRY(AIOReq) aioreq_siblings; | |
258 | } AIOReq; | |
259 | ||
260 | enum AIOCBState { | |
261 | AIOCB_WRITE_UDATA, | |
262 | AIOCB_READ_UDATA, | |
263 | }; | |
264 | ||
265 | struct SheepdogAIOCB { | |
266 | BlockDriverAIOCB common; | |
267 | ||
268 | QEMUIOVector *qiov; | |
269 | ||
270 | int64_t sector_num; | |
271 | int nb_sectors; | |
272 | ||
273 | int ret; | |
274 | enum AIOCBState aiocb_type; | |
275 | ||
276 | QEMUBH *bh; | |
277 | void (*aio_done_func)(SheepdogAIOCB *); | |
278 | ||
279 | int canceled; | |
280 | ||
281 | QLIST_HEAD(aioreq_head, AIOReq) aioreq_head; | |
282 | }; | |
283 | ||
284 | typedef struct BDRVSheepdogState { | |
285 | SheepdogInode inode; | |
286 | ||
287 | uint32_t min_dirty_data_idx; | |
288 | uint32_t max_dirty_data_idx; | |
289 | ||
290 | char name[SD_MAX_VDI_LEN]; | |
291 | int is_snapshot; | |
292 | ||
293 | char *addr; | |
294 | char *port; | |
295 | int fd; | |
296 | ||
297 | uint32_t aioreq_seq_num; | |
298 | QLIST_HEAD(outstanding_aio_head, AIOReq) outstanding_aio_head; | |
299 | } BDRVSheepdogState; | |
300 | ||
301 | static const char * sd_strerror(int err) | |
302 | { | |
303 | int i; | |
304 | ||
305 | static const struct { | |
306 | int err; | |
307 | const char *desc; | |
308 | } errors[] = { | |
309 | {SD_RES_SUCCESS, "Success"}, | |
310 | {SD_RES_UNKNOWN, "Unknown error"}, | |
311 | {SD_RES_NO_OBJ, "No object found"}, | |
312 | {SD_RES_EIO, "I/O error"}, | |
313 | {SD_RES_VDI_EXIST, "VDI exists already"}, | |
314 | {SD_RES_INVALID_PARMS, "Invalid parameters"}, | |
315 | {SD_RES_SYSTEM_ERROR, "System error"}, | |
316 | {SD_RES_VDI_LOCKED, "VDI is already locked"}, | |
317 | {SD_RES_NO_VDI, "No vdi found"}, | |
318 | {SD_RES_NO_BASE_VDI, "No base VDI found"}, | |
319 | {SD_RES_VDI_READ, "Failed read the requested VDI"}, | |
320 | {SD_RES_VDI_WRITE, "Failed to write the requested VDI"}, | |
321 | {SD_RES_BASE_VDI_READ, "Failed to read the base VDI"}, | |
322 | {SD_RES_BASE_VDI_WRITE, "Failed to write the base VDI"}, | |
323 | {SD_RES_NO_TAG, "Failed to find the requested tag"}, | |
324 | {SD_RES_STARTUP, "The system is still booting"}, | |
325 | {SD_RES_VDI_NOT_LOCKED, "VDI isn't locked"}, | |
326 | {SD_RES_SHUTDOWN, "The system is shutting down"}, | |
327 | {SD_RES_NO_MEM, "Out of memory on the server"}, | |
328 | {SD_RES_FULL_VDI, "We already have the maximum vdis"}, | |
329 | {SD_RES_VER_MISMATCH, "Protocol version mismatch"}, | |
330 | {SD_RES_NO_SPACE, "Server has no space for new objects"}, | |
331 | {SD_RES_WAIT_FOR_FORMAT, "Sheepdog is waiting for a format operation"}, | |
332 | {SD_RES_WAIT_FOR_JOIN, "Sheepdog is waiting for other nodes joining"}, | |
333 | {SD_RES_JOIN_FAILED, "Target node had failed to join sheepdog"}, | |
334 | }; | |
335 | ||
336 | for (i = 0; i < ARRAY_SIZE(errors); ++i) { | |
337 | if (errors[i].err == err) { | |
338 | return errors[i].desc; | |
339 | } | |
340 | } | |
341 | ||
342 | return "Invalid error code"; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Sheepdog I/O handling: | |
347 | * | |
348 | * 1. In the sd_aio_readv/writev, read/write requests are added to the | |
349 | * QEMU Bottom Halves. | |
350 | * | |
351 | * 2. In sd_readv_writev_bh_cb, the callbacks of BHs, we send the I/O | |
352 | * requests to the server and link the requests to the | |
353 | * outstanding_list in the BDRVSheepdogState. we exits the | |
354 | * function without waiting for receiving the response. | |
355 | * | |
356 | * 3. We receive the response in aio_read_response, the fd handler to | |
357 | * the sheepdog connection. If metadata update is needed, we send | |
358 | * the write request to the vdi object in sd_write_done, the write | |
359 | * completion function. The AIOCB callback is not called until all | |
360 | * the requests belonging to the AIOCB are finished. | |
361 | */ | |
362 | ||
363 | static inline AIOReq *alloc_aio_req(BDRVSheepdogState *s, SheepdogAIOCB *acb, | |
364 | uint64_t oid, unsigned int data_len, | |
365 | uint64_t offset, uint8_t flags, | |
366 | uint64_t base_oid, unsigned int iov_offset) | |
367 | { | |
368 | AIOReq *aio_req; | |
369 | ||
370 | aio_req = qemu_malloc(sizeof(*aio_req)); | |
371 | aio_req->aiocb = acb; | |
372 | aio_req->iov_offset = iov_offset; | |
373 | aio_req->oid = oid; | |
374 | aio_req->base_oid = base_oid; | |
375 | aio_req->offset = offset; | |
376 | aio_req->data_len = data_len; | |
377 | aio_req->flags = flags; | |
378 | aio_req->id = s->aioreq_seq_num++; | |
379 | ||
380 | QLIST_INSERT_HEAD(&s->outstanding_aio_head, aio_req, | |
381 | outstanding_aio_siblings); | |
382 | QLIST_INSERT_HEAD(&acb->aioreq_head, aio_req, aioreq_siblings); | |
383 | ||
384 | return aio_req; | |
385 | } | |
386 | ||
387 | static inline int free_aio_req(BDRVSheepdogState *s, AIOReq *aio_req) | |
388 | { | |
389 | SheepdogAIOCB *acb = aio_req->aiocb; | |
390 | QLIST_REMOVE(aio_req, outstanding_aio_siblings); | |
391 | QLIST_REMOVE(aio_req, aioreq_siblings); | |
392 | qemu_free(aio_req); | |
393 | ||
394 | return !QLIST_EMPTY(&acb->aioreq_head); | |
395 | } | |
396 | ||
397 | static void sd_finish_aiocb(SheepdogAIOCB *acb) | |
398 | { | |
399 | if (!acb->canceled) { | |
400 | acb->common.cb(acb->common.opaque, acb->ret); | |
401 | } | |
402 | qemu_aio_release(acb); | |
403 | } | |
404 | ||
405 | static void sd_aio_cancel(BlockDriverAIOCB *blockacb) | |
406 | { | |
407 | SheepdogAIOCB *acb = (SheepdogAIOCB *)blockacb; | |
408 | ||
409 | /* | |
410 | * Sheepdog cannot cancel the requests which are already sent to | |
411 | * the servers, so we just complete the request with -EIO here. | |
412 | */ | |
413 | acb->common.cb(acb->common.opaque, -EIO); | |
414 | acb->canceled = 1; | |
415 | } | |
416 | ||
417 | static AIOPool sd_aio_pool = { | |
418 | .aiocb_size = sizeof(SheepdogAIOCB), | |
419 | .cancel = sd_aio_cancel, | |
420 | }; | |
421 | ||
422 | static SheepdogAIOCB *sd_aio_setup(BlockDriverState *bs, QEMUIOVector *qiov, | |
423 | int64_t sector_num, int nb_sectors, | |
424 | BlockDriverCompletionFunc *cb, void *opaque) | |
425 | { | |
426 | SheepdogAIOCB *acb; | |
427 | ||
428 | acb = qemu_aio_get(&sd_aio_pool, bs, cb, opaque); | |
429 | ||
430 | acb->qiov = qiov; | |
431 | ||
432 | acb->sector_num = sector_num; | |
433 | acb->nb_sectors = nb_sectors; | |
434 | ||
435 | acb->aio_done_func = NULL; | |
436 | acb->canceled = 0; | |
437 | acb->bh = NULL; | |
438 | acb->ret = 0; | |
439 | QLIST_INIT(&acb->aioreq_head); | |
440 | return acb; | |
441 | } | |
442 | ||
443 | static int sd_schedule_bh(QEMUBHFunc *cb, SheepdogAIOCB *acb) | |
444 | { | |
445 | if (acb->bh) { | |
446 | error_report("bug: %d %d\n", acb->aiocb_type, acb->aiocb_type); | |
447 | return -EIO; | |
448 | } | |
449 | ||
450 | acb->bh = qemu_bh_new(cb, acb); | |
451 | if (!acb->bh) { | |
452 | error_report("oom: %d %d\n", acb->aiocb_type, acb->aiocb_type); | |
453 | return -EIO; | |
454 | } | |
455 | ||
456 | qemu_bh_schedule(acb->bh); | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
461 | #ifdef _WIN32 | |
462 | ||
463 | struct msghdr { | |
464 | struct iovec *msg_iov; | |
465 | size_t msg_iovlen; | |
466 | }; | |
467 | ||
468 | static ssize_t sendmsg(int s, const struct msghdr *msg, int flags) | |
469 | { | |
470 | size_t size = 0; | |
471 | char *buf, *p; | |
472 | int i, ret; | |
473 | ||
474 | /* count the msg size */ | |
475 | for (i = 0; i < msg->msg_iovlen; i++) { | |
476 | size += msg->msg_iov[i].iov_len; | |
477 | } | |
478 | buf = qemu_malloc(size); | |
479 | ||
480 | p = buf; | |
481 | for (i = 0; i < msg->msg_iovlen; i++) { | |
482 | memcpy(p, msg->msg_iov[i].iov_base, msg->msg_iov[i].iov_len); | |
483 | p += msg->msg_iov[i].iov_len; | |
484 | } | |
485 | ||
486 | ret = send(s, buf, size, flags); | |
487 | ||
488 | qemu_free(buf); | |
489 | return ret; | |
490 | } | |
491 | ||
492 | static ssize_t recvmsg(int s, struct msghdr *msg, int flags) | |
493 | { | |
494 | size_t size = 0; | |
495 | char *buf, *p; | |
496 | int i, ret; | |
497 | ||
498 | /* count the msg size */ | |
499 | for (i = 0; i < msg->msg_iovlen; i++) { | |
500 | size += msg->msg_iov[i].iov_len; | |
501 | } | |
502 | buf = qemu_malloc(size); | |
503 | ||
504 | ret = recv(s, buf, size, flags); | |
505 | if (ret < 0) { | |
506 | goto out; | |
507 | } | |
508 | ||
509 | p = buf; | |
510 | for (i = 0; i < msg->msg_iovlen; i++) { | |
511 | memcpy(msg->msg_iov[i].iov_base, p, msg->msg_iov[i].iov_len); | |
512 | p += msg->msg_iov[i].iov_len; | |
513 | } | |
514 | out: | |
515 | qemu_free(buf); | |
516 | return ret; | |
517 | } | |
518 | ||
519 | #endif | |
520 | ||
521 | /* | |
522 | * Send/recv data with iovec buffers | |
523 | * | |
524 | * This function send/recv data from/to the iovec buffer directly. | |
525 | * The first `offset' bytes in the iovec buffer are skipped and next | |
526 | * `len' bytes are used. | |
527 | * | |
528 | * For example, | |
529 | * | |
530 | * do_send_recv(sockfd, iov, len, offset, 1); | |
531 | * | |
532 | * is equals to | |
533 | * | |
534 | * char *buf = malloc(size); | |
535 | * iov_to_buf(iov, iovcnt, buf, offset, size); | |
536 | * send(sockfd, buf, size, 0); | |
537 | * free(buf); | |
538 | */ | |
539 | static int do_send_recv(int sockfd, struct iovec *iov, int len, int offset, | |
540 | int write) | |
541 | { | |
542 | struct msghdr msg; | |
543 | int ret, diff; | |
544 | ||
545 | memset(&msg, 0, sizeof(msg)); | |
546 | msg.msg_iov = iov; | |
547 | msg.msg_iovlen = 1; | |
548 | ||
549 | len += offset; | |
550 | ||
551 | while (iov->iov_len < len) { | |
552 | len -= iov->iov_len; | |
553 | ||
554 | iov++; | |
555 | msg.msg_iovlen++; | |
556 | } | |
557 | ||
558 | diff = iov->iov_len - len; | |
559 | iov->iov_len -= diff; | |
560 | ||
561 | while (msg.msg_iov->iov_len <= offset) { | |
562 | offset -= msg.msg_iov->iov_len; | |
563 | ||
564 | msg.msg_iov++; | |
565 | msg.msg_iovlen--; | |
566 | } | |
567 | ||
568 | msg.msg_iov->iov_base = (char *) msg.msg_iov->iov_base + offset; | |
569 | msg.msg_iov->iov_len -= offset; | |
570 | ||
571 | if (write) { | |
572 | ret = sendmsg(sockfd, &msg, 0); | |
573 | } else { | |
574 | ret = recvmsg(sockfd, &msg, 0); | |
575 | } | |
576 | ||
577 | msg.msg_iov->iov_base = (char *) msg.msg_iov->iov_base - offset; | |
578 | msg.msg_iov->iov_len += offset; | |
579 | ||
580 | iov->iov_len += diff; | |
581 | return ret; | |
582 | } | |
583 | ||
584 | static int connect_to_sdog(const char *addr, const char *port) | |
585 | { | |
586 | char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; | |
587 | int fd, ret; | |
588 | struct addrinfo hints, *res, *res0; | |
589 | ||
590 | if (!addr) { | |
591 | addr = SD_DEFAULT_ADDR; | |
592 | port = SD_DEFAULT_PORT; | |
593 | } | |
594 | ||
595 | memset(&hints, 0, sizeof(hints)); | |
596 | hints.ai_socktype = SOCK_STREAM; | |
597 | ||
598 | ret = getaddrinfo(addr, port, &hints, &res0); | |
599 | if (ret) { | |
600 | error_report("unable to get address info %s, %s\n", | |
601 | addr, strerror(errno)); | |
602 | return -1; | |
603 | } | |
604 | ||
605 | for (res = res0; res; res = res->ai_next) { | |
606 | ret = getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf), | |
607 | sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV); | |
608 | if (ret) { | |
609 | continue; | |
610 | } | |
611 | ||
612 | fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
613 | if (fd < 0) { | |
614 | continue; | |
615 | } | |
616 | ||
617 | reconnect: | |
618 | ret = connect(fd, res->ai_addr, res->ai_addrlen); | |
619 | if (ret < 0) { | |
620 | if (errno == EINTR) { | |
621 | goto reconnect; | |
622 | } | |
623 | break; | |
624 | } | |
625 | ||
626 | dprintf("connected to %s:%s\n", addr, port); | |
627 | goto success; | |
628 | } | |
629 | fd = -1; | |
630 | error_report("failed connect to %s:%s\n", addr, port); | |
631 | success: | |
632 | freeaddrinfo(res0); | |
633 | return fd; | |
634 | } | |
635 | ||
636 | static int do_readv_writev(int sockfd, struct iovec *iov, int len, | |
637 | int iov_offset, int write) | |
638 | { | |
639 | int ret; | |
640 | again: | |
641 | ret = do_send_recv(sockfd, iov, len, iov_offset, write); | |
642 | if (ret < 0) { | |
643 | if (errno == EINTR || errno == EAGAIN) { | |
644 | goto again; | |
645 | } | |
646 | error_report("failed to recv a rsp, %s\n", strerror(errno)); | |
647 | return 1; | |
648 | } | |
649 | ||
650 | iov_offset += ret; | |
651 | len -= ret; | |
652 | if (len) { | |
653 | goto again; | |
654 | } | |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
659 | static int do_readv(int sockfd, struct iovec *iov, int len, int iov_offset) | |
660 | { | |
661 | return do_readv_writev(sockfd, iov, len, iov_offset, 0); | |
662 | } | |
663 | ||
664 | static int do_writev(int sockfd, struct iovec *iov, int len, int iov_offset) | |
665 | { | |
666 | return do_readv_writev(sockfd, iov, len, iov_offset, 1); | |
667 | } | |
668 | ||
669 | static int do_read_write(int sockfd, void *buf, int len, int write) | |
670 | { | |
671 | struct iovec iov; | |
672 | ||
673 | iov.iov_base = buf; | |
674 | iov.iov_len = len; | |
675 | ||
676 | return do_readv_writev(sockfd, &iov, len, 0, write); | |
677 | } | |
678 | ||
679 | static int do_read(int sockfd, void *buf, int len) | |
680 | { | |
681 | return do_read_write(sockfd, buf, len, 0); | |
682 | } | |
683 | ||
684 | static int do_write(int sockfd, void *buf, int len) | |
685 | { | |
686 | return do_read_write(sockfd, buf, len, 1); | |
687 | } | |
688 | ||
689 | static int send_req(int sockfd, SheepdogReq *hdr, void *data, | |
690 | unsigned int *wlen) | |
691 | { | |
692 | int ret; | |
693 | struct iovec iov[2]; | |
694 | ||
695 | iov[0].iov_base = hdr; | |
696 | iov[0].iov_len = sizeof(*hdr); | |
697 | ||
698 | if (*wlen) { | |
699 | iov[1].iov_base = data; | |
700 | iov[1].iov_len = *wlen; | |
701 | } | |
702 | ||
703 | ret = do_writev(sockfd, iov, sizeof(*hdr) + *wlen, 0); | |
704 | if (ret) { | |
705 | error_report("failed to send a req, %s\n", strerror(errno)); | |
706 | ret = -1; | |
707 | } | |
708 | ||
709 | return ret; | |
710 | } | |
711 | ||
712 | static int do_req(int sockfd, SheepdogReq *hdr, void *data, | |
713 | unsigned int *wlen, unsigned int *rlen) | |
714 | { | |
715 | int ret; | |
716 | ||
717 | ret = send_req(sockfd, hdr, data, wlen); | |
718 | if (ret) { | |
719 | ret = -1; | |
720 | goto out; | |
721 | } | |
722 | ||
723 | ret = do_read(sockfd, hdr, sizeof(*hdr)); | |
724 | if (ret) { | |
725 | error_report("failed to get a rsp, %s\n", strerror(errno)); | |
726 | ret = -1; | |
727 | goto out; | |
728 | } | |
729 | ||
730 | if (*rlen > hdr->data_length) { | |
731 | *rlen = hdr->data_length; | |
732 | } | |
733 | ||
734 | if (*rlen) { | |
735 | ret = do_read(sockfd, data, *rlen); | |
736 | if (ret) { | |
737 | error_report("failed to get the data, %s\n", strerror(errno)); | |
738 | ret = -1; | |
739 | goto out; | |
740 | } | |
741 | } | |
742 | ret = 0; | |
743 | out: | |
744 | return ret; | |
745 | } | |
746 | ||
747 | static int add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, | |
748 | struct iovec *iov, int niov, int create, | |
749 | enum AIOCBState aiocb_type); | |
750 | ||
751 | /* | |
752 | * This function searchs pending requests to the object `oid', and | |
753 | * sends them. | |
754 | */ | |
755 | static void send_pending_req(BDRVSheepdogState *s, uint64_t oid, uint32_t id) | |
756 | { | |
757 | AIOReq *aio_req, *next; | |
758 | SheepdogAIOCB *acb; | |
759 | int ret; | |
760 | ||
761 | QLIST_FOREACH_SAFE(aio_req, &s->outstanding_aio_head, | |
762 | outstanding_aio_siblings, next) { | |
763 | if (id == aio_req->id) { | |
764 | continue; | |
765 | } | |
766 | if (aio_req->oid != oid) { | |
767 | continue; | |
768 | } | |
769 | ||
770 | acb = aio_req->aiocb; | |
771 | ret = add_aio_request(s, aio_req, acb->qiov->iov, | |
772 | acb->qiov->niov, 0, acb->aiocb_type); | |
773 | if (ret < 0) { | |
774 | error_report("add_aio_request is failed\n"); | |
775 | free_aio_req(s, aio_req); | |
776 | if (QLIST_EMPTY(&acb->aioreq_head)) { | |
777 | sd_finish_aiocb(acb); | |
778 | } | |
779 | } | |
780 | } | |
781 | } | |
782 | ||
783 | /* | |
784 | * Receive responses of the I/O requests. | |
785 | * | |
786 | * This function is registered as a fd handler, and called from the | |
787 | * main loop when s->fd is ready for reading responses. | |
788 | */ | |
789 | static void aio_read_response(void *opaque) | |
790 | { | |
791 | SheepdogObjRsp rsp; | |
792 | BDRVSheepdogState *s = opaque; | |
793 | int fd = s->fd; | |
794 | int ret; | |
795 | AIOReq *aio_req = NULL; | |
796 | SheepdogAIOCB *acb; | |
797 | int rest; | |
798 | unsigned long idx; | |
799 | ||
800 | if (QLIST_EMPTY(&s->outstanding_aio_head)) { | |
801 | return; | |
802 | } | |
803 | ||
804 | /* read a header */ | |
805 | ret = do_read(fd, &rsp, sizeof(rsp)); | |
806 | if (ret) { | |
807 | error_report("failed to get the header, %s\n", strerror(errno)); | |
808 | return; | |
809 | } | |
810 | ||
811 | /* find the right aio_req from the outstanding_aio list */ | |
812 | QLIST_FOREACH(aio_req, &s->outstanding_aio_head, outstanding_aio_siblings) { | |
813 | if (aio_req->id == rsp.id) { | |
814 | break; | |
815 | } | |
816 | } | |
817 | if (!aio_req) { | |
818 | error_report("cannot find aio_req %x\n", rsp.id); | |
819 | return; | |
820 | } | |
821 | ||
822 | acb = aio_req->aiocb; | |
823 | ||
824 | switch (acb->aiocb_type) { | |
825 | case AIOCB_WRITE_UDATA: | |
826 | if (!is_data_obj(aio_req->oid)) { | |
827 | break; | |
828 | } | |
829 | idx = data_oid_to_idx(aio_req->oid); | |
830 | ||
831 | if (s->inode.data_vdi_id[idx] != s->inode.vdi_id) { | |
832 | /* | |
833 | * If the object is newly created one, we need to update | |
834 | * the vdi object (metadata object). min_dirty_data_idx | |
835 | * and max_dirty_data_idx are changed to include updated | |
836 | * index between them. | |
837 | */ | |
838 | s->inode.data_vdi_id[idx] = s->inode.vdi_id; | |
839 | s->max_dirty_data_idx = MAX(idx, s->max_dirty_data_idx); | |
840 | s->min_dirty_data_idx = MIN(idx, s->min_dirty_data_idx); | |
841 | ||
842 | /* | |
843 | * Some requests may be blocked because simultaneous | |
844 | * create requests are not allowed, so we search the | |
845 | * pending requests here. | |
846 | */ | |
847 | send_pending_req(s, vid_to_data_oid(s->inode.vdi_id, idx), rsp.id); | |
848 | } | |
849 | break; | |
850 | case AIOCB_READ_UDATA: | |
851 | ret = do_readv(fd, acb->qiov->iov, rsp.data_length, | |
852 | aio_req->iov_offset); | |
853 | if (ret) { | |
854 | error_report("failed to get the data, %s\n", strerror(errno)); | |
855 | return; | |
856 | } | |
857 | break; | |
858 | } | |
859 | ||
860 | if (rsp.result != SD_RES_SUCCESS) { | |
861 | acb->ret = -EIO; | |
862 | error_report("%s\n", sd_strerror(rsp.result)); | |
863 | } | |
864 | ||
865 | rest = free_aio_req(s, aio_req); | |
866 | if (!rest) { | |
867 | /* | |
868 | * We've finished all requests which belong to the AIOCB, so | |
869 | * we can call the callback now. | |
870 | */ | |
871 | acb->aio_done_func(acb); | |
872 | } | |
873 | } | |
874 | ||
875 | static int aio_flush_request(void *opaque) | |
876 | { | |
877 | BDRVSheepdogState *s = opaque; | |
878 | ||
879 | return !QLIST_EMPTY(&s->outstanding_aio_head); | |
880 | } | |
881 | ||
6defcc37 | 882 | #if !defined(SOL_TCP) || !defined(TCP_CORK) |
33b1db1c MK |
883 | |
884 | static int set_cork(int fd, int v) | |
885 | { | |
886 | return 0; | |
887 | } | |
888 | ||
889 | #else | |
890 | ||
891 | static int set_cork(int fd, int v) | |
892 | { | |
893 | return setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v)); | |
894 | } | |
895 | ||
896 | #endif | |
897 | ||
898 | static int set_nodelay(int fd) | |
899 | { | |
900 | int ret, opt; | |
901 | ||
902 | opt = 1; | |
903 | ret = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&opt, sizeof(opt)); | |
904 | return ret; | |
905 | } | |
906 | ||
907 | /* | |
908 | * Return a socket discriptor to read/write objects. | |
909 | * | |
910 | * We cannot use this discriptor for other operations because | |
911 | * the block driver may be on waiting response from the server. | |
912 | */ | |
913 | static int get_sheep_fd(BDRVSheepdogState *s) | |
914 | { | |
915 | int ret, fd; | |
916 | ||
917 | fd = connect_to_sdog(s->addr, s->port); | |
918 | if (fd < 0) { | |
919 | error_report("%s\n", strerror(errno)); | |
920 | return -1; | |
921 | } | |
922 | ||
923 | socket_set_nonblock(fd); | |
924 | ||
925 | ret = set_nodelay(fd); | |
926 | if (ret) { | |
927 | error_report("%s\n", strerror(errno)); | |
928 | closesocket(fd); | |
929 | return -1; | |
930 | } | |
931 | ||
932 | qemu_aio_set_fd_handler(fd, aio_read_response, NULL, aio_flush_request, | |
933 | NULL, s); | |
934 | return fd; | |
935 | } | |
936 | ||
937 | /* | |
938 | * Parse a filename | |
939 | * | |
940 | * filename must be one of the following formats: | |
941 | * 1. [vdiname] | |
942 | * 2. [vdiname]:[snapid] | |
943 | * 3. [vdiname]:[tag] | |
944 | * 4. [hostname]:[port]:[vdiname] | |
945 | * 5. [hostname]:[port]:[vdiname]:[snapid] | |
946 | * 6. [hostname]:[port]:[vdiname]:[tag] | |
947 | * | |
948 | * You can boot from the snapshot images by specifying `snapid` or | |
949 | * `tag'. | |
950 | * | |
951 | * You can run VMs outside the Sheepdog cluster by specifying | |
952 | * `hostname' and `port' (experimental). | |
953 | */ | |
954 | static int parse_vdiname(BDRVSheepdogState *s, const char *filename, | |
955 | char *vdi, uint32_t *snapid, char *tag) | |
956 | { | |
957 | char *p, *q; | |
958 | int nr_sep; | |
959 | ||
960 | p = q = qemu_strdup(filename); | |
961 | ||
962 | /* count the number of separators */ | |
963 | nr_sep = 0; | |
964 | while (*p) { | |
965 | if (*p == ':') { | |
966 | nr_sep++; | |
967 | } | |
968 | p++; | |
969 | } | |
970 | p = q; | |
971 | ||
972 | /* use the first two tokens as hostname and port number. */ | |
973 | if (nr_sep >= 2) { | |
974 | s->addr = p; | |
975 | p = strchr(p, ':'); | |
976 | *p++ = '\0'; | |
977 | ||
978 | s->port = p; | |
979 | p = strchr(p, ':'); | |
980 | *p++ = '\0'; | |
981 | } else { | |
982 | s->addr = NULL; | |
983 | s->port = 0; | |
984 | } | |
985 | ||
986 | strncpy(vdi, p, SD_MAX_VDI_LEN); | |
987 | ||
988 | p = strchr(vdi, ':'); | |
989 | if (p) { | |
990 | *p++ = '\0'; | |
991 | *snapid = strtoul(p, NULL, 10); | |
992 | if (*snapid == 0) { | |
993 | strncpy(tag, p, SD_MAX_VDI_TAG_LEN); | |
994 | } | |
995 | } else { | |
996 | *snapid = CURRENT_VDI_ID; /* search current vdi */ | |
997 | } | |
998 | ||
999 | if (s->addr == NULL) { | |
1000 | qemu_free(q); | |
1001 | } | |
1002 | ||
1003 | return 0; | |
1004 | } | |
1005 | ||
1006 | static int find_vdi_name(BDRVSheepdogState *s, char *filename, uint32_t snapid, | |
1007 | char *tag, uint32_t *vid, int for_snapshot) | |
1008 | { | |
1009 | int ret, fd; | |
1010 | SheepdogVdiReq hdr; | |
1011 | SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; | |
1012 | unsigned int wlen, rlen = 0; | |
1013 | char buf[SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN]; | |
1014 | ||
1015 | fd = connect_to_sdog(s->addr, s->port); | |
1016 | if (fd < 0) { | |
1017 | return -1; | |
1018 | } | |
1019 | ||
1020 | memset(buf, 0, sizeof(buf)); | |
1021 | strncpy(buf, filename, SD_MAX_VDI_LEN); | |
1022 | strncpy(buf + SD_MAX_VDI_LEN, tag, SD_MAX_VDI_TAG_LEN); | |
1023 | ||
1024 | memset(&hdr, 0, sizeof(hdr)); | |
1025 | if (for_snapshot) { | |
1026 | hdr.opcode = SD_OP_GET_VDI_INFO; | |
1027 | } else { | |
1028 | hdr.opcode = SD_OP_LOCK_VDI; | |
1029 | } | |
1030 | wlen = SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN; | |
1031 | hdr.proto_ver = SD_PROTO_VER; | |
1032 | hdr.data_length = wlen; | |
1033 | hdr.snapid = snapid; | |
1034 | hdr.flags = SD_FLAG_CMD_WRITE; | |
1035 | ||
1036 | ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen); | |
1037 | if (ret) { | |
1038 | ret = -1; | |
1039 | goto out; | |
1040 | } | |
1041 | ||
1042 | if (rsp->result != SD_RES_SUCCESS) { | |
1043 | error_report("cannot get vdi info, %s, %s %d %s\n", | |
1044 | sd_strerror(rsp->result), filename, snapid, tag); | |
1045 | ret = -1; | |
1046 | goto out; | |
1047 | } | |
1048 | *vid = rsp->vdi_id; | |
1049 | ||
1050 | ret = 0; | |
1051 | out: | |
1052 | closesocket(fd); | |
1053 | return ret; | |
1054 | } | |
1055 | ||
1056 | static int add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, | |
1057 | struct iovec *iov, int niov, int create, | |
1058 | enum AIOCBState aiocb_type) | |
1059 | { | |
1060 | int nr_copies = s->inode.nr_copies; | |
1061 | SheepdogObjReq hdr; | |
1062 | unsigned int wlen; | |
1063 | int ret; | |
1064 | uint64_t oid = aio_req->oid; | |
1065 | unsigned int datalen = aio_req->data_len; | |
1066 | uint64_t offset = aio_req->offset; | |
1067 | uint8_t flags = aio_req->flags; | |
1068 | uint64_t old_oid = aio_req->base_oid; | |
1069 | ||
1070 | if (!nr_copies) { | |
1071 | error_report("bug\n"); | |
1072 | } | |
1073 | ||
1074 | memset(&hdr, 0, sizeof(hdr)); | |
1075 | ||
1076 | if (aiocb_type == AIOCB_READ_UDATA) { | |
1077 | wlen = 0; | |
1078 | hdr.opcode = SD_OP_READ_OBJ; | |
1079 | hdr.flags = flags; | |
1080 | } else if (create) { | |
1081 | wlen = datalen; | |
1082 | hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ; | |
1083 | hdr.flags = SD_FLAG_CMD_WRITE | flags; | |
1084 | } else { | |
1085 | wlen = datalen; | |
1086 | hdr.opcode = SD_OP_WRITE_OBJ; | |
1087 | hdr.flags = SD_FLAG_CMD_WRITE | flags; | |
1088 | } | |
1089 | ||
1090 | hdr.oid = oid; | |
1091 | hdr.cow_oid = old_oid; | |
1092 | hdr.copies = s->inode.nr_copies; | |
1093 | ||
1094 | hdr.data_length = datalen; | |
1095 | hdr.offset = offset; | |
1096 | ||
1097 | hdr.id = aio_req->id; | |
1098 | ||
1099 | set_cork(s->fd, 1); | |
1100 | ||
1101 | /* send a header */ | |
1102 | ret = do_write(s->fd, &hdr, sizeof(hdr)); | |
1103 | if (ret) { | |
1104 | error_report("failed to send a req, %s\n", strerror(errno)); | |
1105 | return -EIO; | |
1106 | } | |
1107 | ||
1108 | if (wlen) { | |
1109 | ret = do_writev(s->fd, iov, wlen, aio_req->iov_offset); | |
1110 | if (ret) { | |
1111 | error_report("failed to send a data, %s\n", strerror(errno)); | |
1112 | return -EIO; | |
1113 | } | |
1114 | } | |
1115 | ||
1116 | set_cork(s->fd, 0); | |
1117 | ||
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | static int read_write_object(int fd, char *buf, uint64_t oid, int copies, | |
1122 | unsigned int datalen, uint64_t offset, | |
1123 | int write, int create) | |
1124 | { | |
1125 | SheepdogObjReq hdr; | |
1126 | SheepdogObjRsp *rsp = (SheepdogObjRsp *)&hdr; | |
1127 | unsigned int wlen, rlen; | |
1128 | int ret; | |
1129 | ||
1130 | memset(&hdr, 0, sizeof(hdr)); | |
1131 | ||
1132 | if (write) { | |
1133 | wlen = datalen; | |
1134 | rlen = 0; | |
1135 | hdr.flags = SD_FLAG_CMD_WRITE; | |
1136 | if (create) { | |
1137 | hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ; | |
1138 | } else { | |
1139 | hdr.opcode = SD_OP_WRITE_OBJ; | |
1140 | } | |
1141 | } else { | |
1142 | wlen = 0; | |
1143 | rlen = datalen; | |
1144 | hdr.opcode = SD_OP_READ_OBJ; | |
1145 | } | |
1146 | hdr.oid = oid; | |
1147 | hdr.data_length = datalen; | |
1148 | hdr.offset = offset; | |
1149 | hdr.copies = copies; | |
1150 | ||
1151 | ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen); | |
1152 | if (ret) { | |
1153 | error_report("failed to send a request to the sheep\n"); | |
1154 | return -1; | |
1155 | } | |
1156 | ||
1157 | switch (rsp->result) { | |
1158 | case SD_RES_SUCCESS: | |
1159 | return 0; | |
1160 | default: | |
1161 | error_report("%s\n", sd_strerror(rsp->result)); | |
1162 | return -1; | |
1163 | } | |
1164 | } | |
1165 | ||
1166 | static int read_object(int fd, char *buf, uint64_t oid, int copies, | |
1167 | unsigned int datalen, uint64_t offset) | |
1168 | { | |
1169 | return read_write_object(fd, buf, oid, copies, datalen, offset, 0, 0); | |
1170 | } | |
1171 | ||
1172 | static int write_object(int fd, char *buf, uint64_t oid, int copies, | |
1173 | unsigned int datalen, uint64_t offset, int create) | |
1174 | { | |
1175 | return read_write_object(fd, buf, oid, copies, datalen, offset, 1, create); | |
1176 | } | |
1177 | ||
1178 | static int sd_open(BlockDriverState *bs, const char *filename, int flags) | |
1179 | { | |
1180 | int ret, fd; | |
1181 | uint32_t vid = 0; | |
1182 | BDRVSheepdogState *s = bs->opaque; | |
1183 | char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN]; | |
1184 | uint32_t snapid; | |
1185 | char *buf = NULL; | |
1186 | ||
1187 | strstart(filename, "sheepdog:", (const char **)&filename); | |
1188 | ||
1189 | QLIST_INIT(&s->outstanding_aio_head); | |
1190 | s->fd = -1; | |
1191 | ||
1192 | memset(vdi, 0, sizeof(vdi)); | |
1193 | memset(tag, 0, sizeof(tag)); | |
1194 | if (parse_vdiname(s, filename, vdi, &snapid, tag) < 0) { | |
1195 | goto out; | |
1196 | } | |
1197 | s->fd = get_sheep_fd(s); | |
1198 | if (s->fd < 0) { | |
1199 | goto out; | |
1200 | } | |
1201 | ||
1202 | ret = find_vdi_name(s, vdi, snapid, tag, &vid, 0); | |
1203 | if (ret) { | |
1204 | goto out; | |
1205 | } | |
1206 | ||
1207 | if (snapid) { | |
1208 | dprintf("%" PRIx32 " snapshot inode was open.\n", vid); | |
1209 | s->is_snapshot = 1; | |
1210 | } | |
1211 | ||
1212 | fd = connect_to_sdog(s->addr, s->port); | |
1213 | if (fd < 0) { | |
1214 | error_report("failed to connect\n"); | |
1215 | goto out; | |
1216 | } | |
1217 | ||
1218 | buf = qemu_malloc(SD_INODE_SIZE); | |
1219 | ret = read_object(fd, buf, vid_to_vdi_oid(vid), 0, SD_INODE_SIZE, 0); | |
1220 | ||
1221 | closesocket(fd); | |
1222 | ||
1223 | if (ret) { | |
1224 | goto out; | |
1225 | } | |
1226 | ||
1227 | memcpy(&s->inode, buf, sizeof(s->inode)); | |
1228 | s->min_dirty_data_idx = UINT32_MAX; | |
1229 | s->max_dirty_data_idx = 0; | |
1230 | ||
1231 | bs->total_sectors = s->inode.vdi_size / SECTOR_SIZE; | |
1232 | strncpy(s->name, vdi, sizeof(s->name)); | |
1233 | qemu_free(buf); | |
1234 | return 0; | |
1235 | out: | |
1236 | qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL, NULL, NULL); | |
1237 | if (s->fd >= 0) { | |
1238 | closesocket(s->fd); | |
1239 | } | |
1240 | qemu_free(buf); | |
1241 | return -1; | |
1242 | } | |
1243 | ||
1244 | static int do_sd_create(char *filename, int64_t vdi_size, | |
1245 | uint32_t base_vid, uint32_t *vdi_id, int snapshot, | |
1246 | const char *addr, const char *port) | |
1247 | { | |
1248 | SheepdogVdiReq hdr; | |
1249 | SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; | |
1250 | int fd, ret; | |
1251 | unsigned int wlen, rlen = 0; | |
1252 | char buf[SD_MAX_VDI_LEN]; | |
1253 | ||
1254 | fd = connect_to_sdog(addr, port); | |
1255 | if (fd < 0) { | |
1256 | return -EIO; | |
1257 | } | |
1258 | ||
1259 | memset(buf, 0, sizeof(buf)); | |
1260 | strncpy(buf, filename, SD_MAX_VDI_LEN); | |
1261 | ||
1262 | memset(&hdr, 0, sizeof(hdr)); | |
1263 | hdr.opcode = SD_OP_NEW_VDI; | |
1264 | hdr.base_vdi_id = base_vid; | |
1265 | ||
1266 | wlen = SD_MAX_VDI_LEN; | |
1267 | ||
1268 | hdr.flags = SD_FLAG_CMD_WRITE; | |
1269 | hdr.snapid = snapshot; | |
1270 | ||
1271 | hdr.data_length = wlen; | |
1272 | hdr.vdi_size = vdi_size; | |
1273 | ||
1274 | ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen); | |
1275 | ||
1276 | closesocket(fd); | |
1277 | ||
1278 | if (ret) { | |
1279 | return -EIO; | |
1280 | } | |
1281 | ||
1282 | if (rsp->result != SD_RES_SUCCESS) { | |
1283 | error_report("%s, %s\n", sd_strerror(rsp->result), filename); | |
1284 | return -EIO; | |
1285 | } | |
1286 | ||
1287 | if (vdi_id) { | |
1288 | *vdi_id = rsp->vdi_id; | |
1289 | } | |
1290 | ||
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | static int sd_create(const char *filename, QEMUOptionParameter *options) | |
1295 | { | |
1296 | int ret; | |
1297 | uint32_t vid = 0; | |
1298 | int64_t vdi_size = 0; | |
1299 | char *backing_file = NULL; | |
1300 | ||
1301 | strstart(filename, "sheepdog:", (const char **)&filename); | |
1302 | ||
1303 | while (options && options->name) { | |
1304 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
1305 | vdi_size = options->value.n; | |
1306 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
1307 | backing_file = options->value.s; | |
1308 | } | |
1309 | options++; | |
1310 | } | |
1311 | ||
1312 | if (vdi_size > SD_MAX_VDI_SIZE) { | |
1313 | error_report("too big image size\n"); | |
1314 | return -EINVAL; | |
1315 | } | |
1316 | ||
1317 | if (backing_file) { | |
1318 | BlockDriverState *bs; | |
1319 | BDRVSheepdogState *s; | |
1320 | BlockDriver *drv; | |
1321 | ||
1322 | /* Currently, only Sheepdog backing image is supported. */ | |
1323 | drv = bdrv_find_protocol(backing_file); | |
1324 | if (!drv || strcmp(drv->protocol_name, "sheepdog") != 0) { | |
1325 | error_report("backing_file must be a sheepdog image\n"); | |
1326 | return -EINVAL; | |
1327 | } | |
1328 | ||
1329 | ret = bdrv_file_open(&bs, backing_file, 0); | |
1330 | if (ret < 0) | |
1331 | return -EIO; | |
1332 | ||
1333 | s = bs->opaque; | |
1334 | ||
1335 | if (!is_snapshot(&s->inode)) { | |
1336 | error_report("cannot clone from a non snapshot vdi\n"); | |
1337 | bdrv_delete(bs); | |
1338 | return -EINVAL; | |
1339 | } | |
1340 | ||
1341 | vid = s->inode.vdi_id; | |
1342 | bdrv_delete(bs); | |
1343 | } | |
1344 | ||
1345 | return do_sd_create((char *)filename, vdi_size, vid, NULL, 0, NULL, NULL); | |
1346 | } | |
1347 | ||
1348 | static void sd_close(BlockDriverState *bs) | |
1349 | { | |
1350 | BDRVSheepdogState *s = bs->opaque; | |
1351 | SheepdogVdiReq hdr; | |
1352 | SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; | |
1353 | unsigned int wlen, rlen = 0; | |
1354 | int fd, ret; | |
1355 | ||
1356 | dprintf("%s\n", s->name); | |
1357 | ||
1358 | fd = connect_to_sdog(s->addr, s->port); | |
1359 | if (fd < 0) { | |
1360 | return; | |
1361 | } | |
1362 | ||
1363 | memset(&hdr, 0, sizeof(hdr)); | |
1364 | ||
1365 | hdr.opcode = SD_OP_RELEASE_VDI; | |
1366 | wlen = strlen(s->name) + 1; | |
1367 | hdr.data_length = wlen; | |
1368 | hdr.flags = SD_FLAG_CMD_WRITE; | |
1369 | ||
1370 | ret = do_req(fd, (SheepdogReq *)&hdr, s->name, &wlen, &rlen); | |
1371 | ||
1372 | closesocket(fd); | |
1373 | ||
1374 | if (!ret && rsp->result != SD_RES_SUCCESS && | |
1375 | rsp->result != SD_RES_VDI_NOT_LOCKED) { | |
1376 | error_report("%s, %s\n", sd_strerror(rsp->result), s->name); | |
1377 | } | |
1378 | ||
1379 | qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL, NULL, NULL); | |
1380 | closesocket(s->fd); | |
1381 | qemu_free(s->addr); | |
1382 | } | |
1383 | ||
1384 | static int64_t sd_getlength(BlockDriverState *bs) | |
1385 | { | |
1386 | BDRVSheepdogState *s = bs->opaque; | |
1387 | ||
1388 | return s->inode.vdi_size; | |
1389 | } | |
1390 | ||
1391 | static int sd_truncate(BlockDriverState *bs, int64_t offset) | |
1392 | { | |
1393 | BDRVSheepdogState *s = bs->opaque; | |
1394 | int ret, fd; | |
1395 | unsigned int datalen; | |
1396 | ||
1397 | if (offset < s->inode.vdi_size) { | |
1398 | error_report("shrinking is not supported\n"); | |
1399 | return -EINVAL; | |
1400 | } else if (offset > SD_MAX_VDI_SIZE) { | |
1401 | error_report("too big image size\n"); | |
1402 | return -EINVAL; | |
1403 | } | |
1404 | ||
1405 | fd = connect_to_sdog(s->addr, s->port); | |
1406 | if (fd < 0) { | |
1407 | return -EIO; | |
1408 | } | |
1409 | ||
1410 | /* we don't need to update entire object */ | |
1411 | datalen = SD_INODE_SIZE - sizeof(s->inode.data_vdi_id); | |
1412 | s->inode.vdi_size = offset; | |
1413 | ret = write_object(fd, (char *)&s->inode, vid_to_vdi_oid(s->inode.vdi_id), | |
1414 | s->inode.nr_copies, datalen, 0, 0); | |
1415 | close(fd); | |
1416 | ||
1417 | if (ret < 0) { | |
1418 | error_report("failed to update an inode.\n"); | |
1419 | return -EIO; | |
1420 | } | |
1421 | ||
1422 | return 0; | |
1423 | } | |
1424 | ||
1425 | /* | |
1426 | * This function is called after writing data objects. If we need to | |
1427 | * update metadata, this sends a write request to the vdi object. | |
1428 | * Otherwise, this calls the AIOCB callback. | |
1429 | */ | |
1430 | static void sd_write_done(SheepdogAIOCB *acb) | |
1431 | { | |
1432 | int ret; | |
1433 | BDRVSheepdogState *s = acb->common.bs->opaque; | |
1434 | struct iovec iov; | |
1435 | AIOReq *aio_req; | |
1436 | uint32_t offset, data_len, mn, mx; | |
1437 | ||
1438 | mn = s->min_dirty_data_idx; | |
1439 | mx = s->max_dirty_data_idx; | |
1440 | if (mn <= mx) { | |
1441 | /* we need to update the vdi object. */ | |
1442 | offset = sizeof(s->inode) - sizeof(s->inode.data_vdi_id) + | |
1443 | mn * sizeof(s->inode.data_vdi_id[0]); | |
1444 | data_len = (mx - mn + 1) * sizeof(s->inode.data_vdi_id[0]); | |
1445 | ||
1446 | s->min_dirty_data_idx = UINT32_MAX; | |
1447 | s->max_dirty_data_idx = 0; | |
1448 | ||
1449 | iov.iov_base = &s->inode; | |
1450 | iov.iov_len = sizeof(s->inode); | |
1451 | aio_req = alloc_aio_req(s, acb, vid_to_vdi_oid(s->inode.vdi_id), | |
1452 | data_len, offset, 0, 0, offset); | |
1453 | ret = add_aio_request(s, aio_req, &iov, 1, 0, AIOCB_WRITE_UDATA); | |
1454 | if (ret) { | |
1455 | free_aio_req(s, aio_req); | |
1456 | acb->ret = -EIO; | |
1457 | goto out; | |
1458 | } | |
1459 | ||
1460 | acb->aio_done_func = sd_finish_aiocb; | |
1461 | acb->aiocb_type = AIOCB_WRITE_UDATA; | |
1462 | return; | |
1463 | } | |
1464 | out: | |
1465 | sd_finish_aiocb(acb); | |
1466 | } | |
1467 | ||
1468 | /* | |
1469 | * Create a writable VDI from a snapshot | |
1470 | */ | |
1471 | static int sd_create_branch(BDRVSheepdogState *s) | |
1472 | { | |
1473 | int ret, fd; | |
1474 | uint32_t vid; | |
1475 | char *buf; | |
1476 | ||
1477 | dprintf("%" PRIx32 " is snapshot.\n", s->inode.vdi_id); | |
1478 | ||
1479 | buf = qemu_malloc(SD_INODE_SIZE); | |
1480 | ||
1481 | ret = do_sd_create(s->name, s->inode.vdi_size, s->inode.vdi_id, &vid, 1, | |
1482 | s->addr, s->port); | |
1483 | if (ret) { | |
1484 | goto out; | |
1485 | } | |
1486 | ||
1487 | dprintf("%" PRIx32 " is created.\n", vid); | |
1488 | ||
1489 | fd = connect_to_sdog(s->addr, s->port); | |
1490 | if (fd < 0) { | |
1491 | error_report("failed to connect\n"); | |
1492 | goto out; | |
1493 | } | |
1494 | ||
1495 | ret = read_object(fd, buf, vid_to_vdi_oid(vid), s->inode.nr_copies, | |
1496 | SD_INODE_SIZE, 0); | |
1497 | ||
1498 | closesocket(fd); | |
1499 | ||
1500 | if (ret < 0) { | |
1501 | goto out; | |
1502 | } | |
1503 | ||
1504 | memcpy(&s->inode, buf, sizeof(s->inode)); | |
1505 | ||
1506 | s->is_snapshot = 0; | |
1507 | ret = 0; | |
1508 | dprintf("%" PRIx32 " was newly created.\n", s->inode.vdi_id); | |
1509 | ||
1510 | out: | |
1511 | qemu_free(buf); | |
1512 | ||
1513 | return ret; | |
1514 | } | |
1515 | ||
1516 | /* | |
1517 | * Send I/O requests to the server. | |
1518 | * | |
1519 | * This function sends requests to the server, links the requests to | |
1520 | * the outstanding_list in BDRVSheepdogState, and exits without | |
1521 | * waiting the response. The responses are received in the | |
1522 | * `aio_read_response' function which is called from the main loop as | |
1523 | * a fd handler. | |
1524 | */ | |
1525 | static void sd_readv_writev_bh_cb(void *p) | |
1526 | { | |
1527 | SheepdogAIOCB *acb = p; | |
1528 | int ret = 0; | |
1529 | unsigned long len, done = 0, total = acb->nb_sectors * SECTOR_SIZE; | |
1530 | unsigned long idx = acb->sector_num * SECTOR_SIZE / SD_DATA_OBJ_SIZE; | |
1531 | uint64_t oid; | |
1532 | uint64_t offset = (acb->sector_num * SECTOR_SIZE) % SD_DATA_OBJ_SIZE; | |
1533 | BDRVSheepdogState *s = acb->common.bs->opaque; | |
1534 | SheepdogInode *inode = &s->inode; | |
1535 | AIOReq *aio_req; | |
1536 | ||
1537 | qemu_bh_delete(acb->bh); | |
1538 | acb->bh = NULL; | |
1539 | ||
1540 | if (acb->aiocb_type == AIOCB_WRITE_UDATA && s->is_snapshot) { | |
1541 | /* | |
1542 | * In the case we open the snapshot VDI, Sheepdog creates the | |
1543 | * writable VDI when we do a write operation first. | |
1544 | */ | |
1545 | ret = sd_create_branch(s); | |
1546 | if (ret) { | |
1547 | acb->ret = -EIO; | |
1548 | goto out; | |
1549 | } | |
1550 | } | |
1551 | ||
1552 | while (done != total) { | |
1553 | uint8_t flags = 0; | |
1554 | uint64_t old_oid = 0; | |
1555 | int create = 0; | |
1556 | ||
1557 | oid = vid_to_data_oid(inode->data_vdi_id[idx], idx); | |
1558 | ||
1559 | len = MIN(total - done, SD_DATA_OBJ_SIZE - offset); | |
1560 | ||
1561 | if (!inode->data_vdi_id[idx]) { | |
1562 | if (acb->aiocb_type == AIOCB_READ_UDATA) { | |
1563 | goto done; | |
1564 | } | |
1565 | ||
1566 | create = 1; | |
1567 | } else if (acb->aiocb_type == AIOCB_WRITE_UDATA | |
1568 | && !is_data_obj_writeable(inode, idx)) { | |
1569 | /* Copy-On-Write */ | |
1570 | create = 1; | |
1571 | old_oid = oid; | |
1572 | flags = SD_FLAG_CMD_COW; | |
1573 | } | |
1574 | ||
1575 | if (create) { | |
1576 | dprintf("update ino (%" PRIu32") %" PRIu64 " %" PRIu64 | |
1577 | " %" PRIu64 "\n", inode->vdi_id, oid, | |
1578 | vid_to_data_oid(inode->data_vdi_id[idx], idx), idx); | |
1579 | oid = vid_to_data_oid(inode->vdi_id, idx); | |
1580 | dprintf("new oid %lx\n", oid); | |
1581 | } | |
1582 | ||
1583 | aio_req = alloc_aio_req(s, acb, oid, len, offset, flags, old_oid, done); | |
1584 | ||
1585 | if (create) { | |
1586 | AIOReq *areq; | |
1587 | QLIST_FOREACH(areq, &s->outstanding_aio_head, | |
1588 | outstanding_aio_siblings) { | |
1589 | if (areq == aio_req) { | |
1590 | continue; | |
1591 | } | |
1592 | if (areq->oid == oid) { | |
1593 | /* | |
1594 | * Sheepdog cannot handle simultaneous create | |
1595 | * requests to the same object. So we cannot send | |
1596 | * the request until the previous request | |
1597 | * finishes. | |
1598 | */ | |
1599 | aio_req->flags = 0; | |
1600 | aio_req->base_oid = 0; | |
1601 | goto done; | |
1602 | } | |
1603 | } | |
1604 | } | |
1605 | ||
1606 | ret = add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov, | |
1607 | create, acb->aiocb_type); | |
1608 | if (ret < 0) { | |
1609 | error_report("add_aio_request is failed\n"); | |
1610 | free_aio_req(s, aio_req); | |
1611 | acb->ret = -EIO; | |
1612 | goto out; | |
1613 | } | |
1614 | done: | |
1615 | offset = 0; | |
1616 | idx++; | |
1617 | done += len; | |
1618 | } | |
1619 | out: | |
1620 | if (QLIST_EMPTY(&acb->aioreq_head)) { | |
1621 | sd_finish_aiocb(acb); | |
1622 | } | |
1623 | } | |
1624 | ||
1625 | static BlockDriverAIOCB *sd_aio_writev(BlockDriverState *bs, int64_t sector_num, | |
1626 | QEMUIOVector *qiov, int nb_sectors, | |
1627 | BlockDriverCompletionFunc *cb, | |
1628 | void *opaque) | |
1629 | { | |
1630 | SheepdogAIOCB *acb; | |
1631 | ||
1632 | if (bs->growable && sector_num + nb_sectors > bs->total_sectors) { | |
1633 | /* TODO: shouldn't block here */ | |
1634 | if (sd_truncate(bs, (sector_num + nb_sectors) * SECTOR_SIZE) < 0) { | |
1635 | return NULL; | |
1636 | } | |
1637 | bs->total_sectors = sector_num + nb_sectors; | |
1638 | } | |
1639 | ||
1640 | acb = sd_aio_setup(bs, qiov, sector_num, nb_sectors, cb, opaque); | |
1641 | acb->aio_done_func = sd_write_done; | |
1642 | acb->aiocb_type = AIOCB_WRITE_UDATA; | |
1643 | ||
1644 | sd_schedule_bh(sd_readv_writev_bh_cb, acb); | |
1645 | return &acb->common; | |
1646 | } | |
1647 | ||
1648 | static BlockDriverAIOCB *sd_aio_readv(BlockDriverState *bs, int64_t sector_num, | |
1649 | QEMUIOVector *qiov, int nb_sectors, | |
1650 | BlockDriverCompletionFunc *cb, | |
1651 | void *opaque) | |
1652 | { | |
1653 | SheepdogAIOCB *acb; | |
1654 | int i; | |
1655 | ||
1656 | acb = sd_aio_setup(bs, qiov, sector_num, nb_sectors, cb, opaque); | |
1657 | acb->aiocb_type = AIOCB_READ_UDATA; | |
1658 | acb->aio_done_func = sd_finish_aiocb; | |
1659 | ||
1660 | /* | |
1661 | * TODO: we can do better; we don't need to initialize | |
1662 | * blindly. | |
1663 | */ | |
1664 | for (i = 0; i < qiov->niov; i++) { | |
1665 | memset(qiov->iov[i].iov_base, 0, qiov->iov[i].iov_len); | |
1666 | } | |
1667 | ||
1668 | sd_schedule_bh(sd_readv_writev_bh_cb, acb); | |
1669 | return &acb->common; | |
1670 | } | |
1671 | ||
1672 | static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info) | |
1673 | { | |
1674 | BDRVSheepdogState *s = bs->opaque; | |
1675 | int ret, fd; | |
1676 | uint32_t new_vid; | |
1677 | SheepdogInode *inode; | |
1678 | unsigned int datalen; | |
1679 | ||
1680 | dprintf("sn_info: name %s id_str %s s: name %s vm_state_size %d " | |
1681 | "is_snapshot %d\n", sn_info->name, sn_info->id_str, | |
1682 | s->name, sn_info->vm_state_size, s->is_snapshot); | |
1683 | ||
1684 | if (s->is_snapshot) { | |
1685 | error_report("You can't create a snapshot of a snapshot VDI, " | |
1686 | "%s (%" PRIu32 ").\n", s->name, s->inode.vdi_id); | |
1687 | ||
1688 | return -EINVAL; | |
1689 | } | |
1690 | ||
1691 | dprintf("%s %s\n", sn_info->name, sn_info->id_str); | |
1692 | ||
1693 | s->inode.vm_state_size = sn_info->vm_state_size; | |
1694 | s->inode.vm_clock_nsec = sn_info->vm_clock_nsec; | |
1695 | strncpy(s->inode.tag, sn_info->name, sizeof(s->inode.tag)); | |
1696 | /* we don't need to update entire object */ | |
1697 | datalen = SD_INODE_SIZE - sizeof(s->inode.data_vdi_id); | |
1698 | ||
1699 | /* refresh inode. */ | |
1700 | fd = connect_to_sdog(s->addr, s->port); | |
1701 | if (fd < 0) { | |
1702 | ret = -EIO; | |
1703 | goto cleanup; | |
1704 | } | |
1705 | ||
1706 | ret = write_object(fd, (char *)&s->inode, vid_to_vdi_oid(s->inode.vdi_id), | |
1707 | s->inode.nr_copies, datalen, 0, 0); | |
1708 | if (ret < 0) { | |
1709 | error_report("failed to write snapshot's inode.\n"); | |
1710 | ret = -EIO; | |
1711 | goto cleanup; | |
1712 | } | |
1713 | ||
1714 | ret = do_sd_create(s->name, s->inode.vdi_size, s->inode.vdi_id, &new_vid, 1, | |
1715 | s->addr, s->port); | |
1716 | if (ret < 0) { | |
1717 | error_report("failed to create inode for snapshot. %s\n", | |
1718 | strerror(errno)); | |
1719 | ret = -EIO; | |
1720 | goto cleanup; | |
1721 | } | |
1722 | ||
1723 | inode = (SheepdogInode *)qemu_malloc(datalen); | |
1724 | ||
1725 | ret = read_object(fd, (char *)inode, vid_to_vdi_oid(new_vid), | |
1726 | s->inode.nr_copies, datalen, 0); | |
1727 | ||
1728 | if (ret < 0) { | |
1729 | error_report("failed to read new inode info. %s\n", strerror(errno)); | |
1730 | ret = -EIO; | |
1731 | goto cleanup; | |
1732 | } | |
1733 | ||
1734 | memcpy(&s->inode, inode, datalen); | |
1735 | dprintf("s->inode: name %s snap_id %x oid %x\n", | |
1736 | s->inode.name, s->inode.snap_id, s->inode.vdi_id); | |
1737 | ||
1738 | cleanup: | |
1739 | closesocket(fd); | |
1740 | return ret; | |
1741 | } | |
1742 | ||
1743 | static int sd_snapshot_goto(BlockDriverState *bs, const char *snapshot_id) | |
1744 | { | |
1745 | BDRVSheepdogState *s = bs->opaque; | |
1746 | BDRVSheepdogState *old_s; | |
1747 | char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN]; | |
1748 | char *buf = NULL; | |
1749 | uint32_t vid; | |
1750 | uint32_t snapid = 0; | |
1751 | int ret = -ENOENT, fd; | |
1752 | ||
1753 | old_s = qemu_malloc(sizeof(BDRVSheepdogState)); | |
1754 | ||
1755 | memcpy(old_s, s, sizeof(BDRVSheepdogState)); | |
1756 | ||
1757 | memset(vdi, 0, sizeof(vdi)); | |
1758 | strncpy(vdi, s->name, sizeof(vdi)); | |
1759 | ||
1760 | memset(tag, 0, sizeof(tag)); | |
1761 | snapid = strtoul(snapshot_id, NULL, 10); | |
1762 | if (!snapid) { | |
1763 | strncpy(tag, s->name, sizeof(tag)); | |
1764 | } | |
1765 | ||
1766 | ret = find_vdi_name(s, vdi, snapid, tag, &vid, 1); | |
1767 | if (ret) { | |
1768 | error_report("Failed to find_vdi_name\n"); | |
1769 | ret = -ENOENT; | |
1770 | goto out; | |
1771 | } | |
1772 | ||
1773 | fd = connect_to_sdog(s->addr, s->port); | |
1774 | if (fd < 0) { | |
1775 | error_report("failed to connect\n"); | |
1776 | goto out; | |
1777 | } | |
1778 | ||
1779 | buf = qemu_malloc(SD_INODE_SIZE); | |
1780 | ret = read_object(fd, buf, vid_to_vdi_oid(vid), s->inode.nr_copies, | |
1781 | SD_INODE_SIZE, 0); | |
1782 | ||
1783 | closesocket(fd); | |
1784 | ||
1785 | if (ret) { | |
1786 | ret = -ENOENT; | |
1787 | goto out; | |
1788 | } | |
1789 | ||
1790 | memcpy(&s->inode, buf, sizeof(s->inode)); | |
1791 | ||
1792 | if (!s->inode.vm_state_size) { | |
1793 | error_report("Invalid snapshot\n"); | |
1794 | ret = -ENOENT; | |
1795 | goto out; | |
1796 | } | |
1797 | ||
1798 | s->is_snapshot = 1; | |
1799 | ||
1800 | qemu_free(buf); | |
1801 | qemu_free(old_s); | |
1802 | ||
1803 | return 0; | |
1804 | out: | |
1805 | /* recover bdrv_sd_state */ | |
1806 | memcpy(s, old_s, sizeof(BDRVSheepdogState)); | |
1807 | qemu_free(buf); | |
1808 | qemu_free(old_s); | |
1809 | ||
1810 | error_report("failed to open. recover old bdrv_sd_state.\n"); | |
1811 | ||
1812 | return ret; | |
1813 | } | |
1814 | ||
1815 | static int sd_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
1816 | { | |
1817 | /* FIXME: Delete specified snapshot id. */ | |
1818 | return 0; | |
1819 | } | |
1820 | ||
1821 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) | |
1822 | #define BITS_PER_BYTE 8 | |
1823 | #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) | |
1824 | #define DECLARE_BITMAP(name,bits) \ | |
1825 | unsigned long name[BITS_TO_LONGS(bits)] | |
1826 | ||
1827 | #define BITS_PER_LONG (BITS_PER_BYTE * sizeof(long)) | |
1828 | ||
1829 | static inline int test_bit(unsigned int nr, const unsigned long *addr) | |
1830 | { | |
1831 | return ((1UL << (nr % BITS_PER_LONG)) & | |
1832 | (((unsigned long *)addr)[nr / BITS_PER_LONG])) != 0; | |
1833 | } | |
1834 | ||
1835 | static int sd_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab) | |
1836 | { | |
1837 | BDRVSheepdogState *s = bs->opaque; | |
1838 | SheepdogReq req; | |
1839 | int fd, nr = 1024, ret, max = BITS_TO_LONGS(SD_NR_VDIS) * sizeof(long); | |
1840 | QEMUSnapshotInfo *sn_tab = NULL; | |
1841 | unsigned wlen, rlen; | |
1842 | int found = 0; | |
1843 | static SheepdogInode inode; | |
1844 | unsigned long *vdi_inuse; | |
1845 | unsigned int start_nr; | |
1846 | uint64_t hval; | |
1847 | uint32_t vid; | |
1848 | ||
1849 | vdi_inuse = qemu_malloc(max); | |
1850 | ||
1851 | fd = connect_to_sdog(s->addr, s->port); | |
1852 | if (fd < 0) { | |
1853 | goto out; | |
1854 | } | |
1855 | ||
1856 | rlen = max; | |
1857 | wlen = 0; | |
1858 | ||
1859 | memset(&req, 0, sizeof(req)); | |
1860 | ||
1861 | req.opcode = SD_OP_READ_VDIS; | |
1862 | req.data_length = max; | |
1863 | ||
1864 | ret = do_req(fd, (SheepdogReq *)&req, vdi_inuse, &wlen, &rlen); | |
1865 | ||
1866 | closesocket(fd); | |
1867 | if (ret) { | |
1868 | goto out; | |
1869 | } | |
1870 | ||
1871 | sn_tab = qemu_mallocz(nr * sizeof(*sn_tab)); | |
1872 | ||
1873 | /* calculate a vdi id with hash function */ | |
1874 | hval = fnv_64a_buf(s->name, strlen(s->name), FNV1A_64_INIT); | |
1875 | start_nr = hval & (SD_NR_VDIS - 1); | |
1876 | ||
1877 | fd = connect_to_sdog(s->addr, s->port); | |
1878 | if (fd < 0) { | |
1879 | error_report("failed to connect\n"); | |
1880 | goto out; | |
1881 | } | |
1882 | ||
1883 | for (vid = start_nr; found < nr; vid = (vid + 1) % SD_NR_VDIS) { | |
1884 | if (!test_bit(vid, vdi_inuse)) { | |
1885 | break; | |
1886 | } | |
1887 | ||
1888 | /* we don't need to read entire object */ | |
1889 | ret = read_object(fd, (char *)&inode, vid_to_vdi_oid(vid), | |
1890 | 0, SD_INODE_SIZE - sizeof(inode.data_vdi_id), 0); | |
1891 | ||
1892 | if (ret) { | |
1893 | continue; | |
1894 | } | |
1895 | ||
1896 | if (!strcmp(inode.name, s->name) && is_snapshot(&inode)) { | |
1897 | sn_tab[found].date_sec = inode.snap_ctime >> 32; | |
1898 | sn_tab[found].date_nsec = inode.snap_ctime & 0xffffffff; | |
1899 | sn_tab[found].vm_state_size = inode.vm_state_size; | |
1900 | sn_tab[found].vm_clock_nsec = inode.vm_clock_nsec; | |
1901 | ||
1902 | snprintf(sn_tab[found].id_str, sizeof(sn_tab[found].id_str), "%u", | |
1903 | inode.snap_id); | |
1904 | strncpy(sn_tab[found].name, inode.tag, | |
1905 | MIN(sizeof(sn_tab[found].name), sizeof(inode.tag))); | |
1906 | found++; | |
1907 | } | |
1908 | } | |
1909 | ||
1910 | closesocket(fd); | |
1911 | out: | |
1912 | *psn_tab = sn_tab; | |
1913 | ||
1914 | qemu_free(vdi_inuse); | |
1915 | ||
1916 | return found; | |
1917 | } | |
1918 | ||
1919 | static int do_load_save_vmstate(BDRVSheepdogState *s, uint8_t *data, | |
1920 | int64_t pos, int size, int load) | |
1921 | { | |
1922 | int fd, create; | |
1923 | int ret = 0; | |
1924 | unsigned int data_len; | |
1925 | uint64_t vmstate_oid; | |
1926 | uint32_t vdi_index; | |
1927 | uint64_t offset; | |
1928 | ||
1929 | fd = connect_to_sdog(s->addr, s->port); | |
1930 | if (fd < 0) { | |
1931 | ret = -EIO; | |
1932 | goto cleanup; | |
1933 | } | |
1934 | ||
1935 | while (size) { | |
1936 | vdi_index = pos / SD_DATA_OBJ_SIZE; | |
1937 | offset = pos % SD_DATA_OBJ_SIZE; | |
1938 | ||
1939 | data_len = MIN(size, SD_DATA_OBJ_SIZE); | |
1940 | ||
1941 | vmstate_oid = vid_to_vmstate_oid(s->inode.vdi_id, vdi_index); | |
1942 | ||
1943 | create = (offset == 0); | |
1944 | if (load) { | |
1945 | ret = read_object(fd, (char *)data, vmstate_oid, | |
1946 | s->inode.nr_copies, data_len, offset); | |
1947 | } else { | |
1948 | ret = write_object(fd, (char *)data, vmstate_oid, | |
1949 | s->inode.nr_copies, data_len, offset, create); | |
1950 | } | |
1951 | ||
1952 | if (ret < 0) { | |
1953 | error_report("failed to save vmstate %s\n", strerror(errno)); | |
1954 | ret = -EIO; | |
1955 | goto cleanup; | |
1956 | } | |
1957 | ||
1958 | pos += data_len; | |
1959 | size -= data_len; | |
1960 | ret += data_len; | |
1961 | } | |
1962 | cleanup: | |
1963 | closesocket(fd); | |
1964 | return ret; | |
1965 | } | |
1966 | ||
1967 | static int sd_save_vmstate(BlockDriverState *bs, const uint8_t *data, | |
1968 | int64_t pos, int size) | |
1969 | { | |
1970 | BDRVSheepdogState *s = bs->opaque; | |
1971 | ||
1972 | return do_load_save_vmstate(s, (uint8_t *)data, pos, size, 0); | |
1973 | } | |
1974 | ||
1975 | static int sd_load_vmstate(BlockDriverState *bs, uint8_t *data, | |
1976 | int64_t pos, int size) | |
1977 | { | |
1978 | BDRVSheepdogState *s = bs->opaque; | |
1979 | ||
1980 | return do_load_save_vmstate(s, data, pos, size, 1); | |
1981 | } | |
1982 | ||
1983 | ||
1984 | static QEMUOptionParameter sd_create_options[] = { | |
1985 | { | |
1986 | .name = BLOCK_OPT_SIZE, | |
1987 | .type = OPT_SIZE, | |
1988 | .help = "Virtual disk size" | |
1989 | }, | |
1990 | { | |
1991 | .name = BLOCK_OPT_BACKING_FILE, | |
1992 | .type = OPT_STRING, | |
1993 | .help = "File name of a base image" | |
1994 | }, | |
1995 | { NULL } | |
1996 | }; | |
1997 | ||
1998 | BlockDriver bdrv_sheepdog = { | |
1999 | .format_name = "sheepdog", | |
2000 | .protocol_name = "sheepdog", | |
2001 | .instance_size = sizeof(BDRVSheepdogState), | |
2002 | .bdrv_file_open = sd_open, | |
2003 | .bdrv_close = sd_close, | |
2004 | .bdrv_create = sd_create, | |
2005 | .bdrv_getlength = sd_getlength, | |
2006 | .bdrv_truncate = sd_truncate, | |
2007 | ||
2008 | .bdrv_aio_readv = sd_aio_readv, | |
2009 | .bdrv_aio_writev = sd_aio_writev, | |
2010 | ||
2011 | .bdrv_snapshot_create = sd_snapshot_create, | |
2012 | .bdrv_snapshot_goto = sd_snapshot_goto, | |
2013 | .bdrv_snapshot_delete = sd_snapshot_delete, | |
2014 | .bdrv_snapshot_list = sd_snapshot_list, | |
2015 | ||
2016 | .bdrv_save_vmstate = sd_save_vmstate, | |
2017 | .bdrv_load_vmstate = sd_load_vmstate, | |
2018 | ||
2019 | .create_options = sd_create_options, | |
2020 | }; | |
2021 | ||
2022 | static void bdrv_sheepdog_init(void) | |
2023 | { | |
2024 | bdrv_register(&bdrv_sheepdog); | |
2025 | } | |
2026 | block_init(bdrv_sheepdog_init); |