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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/>. | |
6b620ca3 PB |
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. | |
33b1db1c | 13 | */ |
33b1db1c MK |
14 | |
15 | #include "qemu-common.h" | |
5d6768e3 | 16 | #include "qemu/uri.h" |
1de7afc9 PB |
17 | #include "qemu/error-report.h" |
18 | #include "qemu/sockets.h" | |
737e150e | 19 | #include "block/block_int.h" |
1de7afc9 | 20 | #include "qemu/bitops.h" |
33b1db1c MK |
21 | |
22 | #define SD_PROTO_VER 0x01 | |
23 | ||
24 | #define SD_DEFAULT_ADDR "localhost" | |
25af257d | 25 | #define SD_DEFAULT_PORT 7000 |
33b1db1c MK |
26 | |
27 | #define SD_OP_CREATE_AND_WRITE_OBJ 0x01 | |
28 | #define SD_OP_READ_OBJ 0x02 | |
29 | #define SD_OP_WRITE_OBJ 0x03 | |
cac8f4a6 LY |
30 | /* 0x04 is used internally by Sheepdog */ |
31 | #define SD_OP_DISCARD_OBJ 0x05 | |
33b1db1c MK |
32 | |
33 | #define SD_OP_NEW_VDI 0x11 | |
34 | #define SD_OP_LOCK_VDI 0x12 | |
35 | #define SD_OP_RELEASE_VDI 0x13 | |
36 | #define SD_OP_GET_VDI_INFO 0x14 | |
37 | #define SD_OP_READ_VDIS 0x15 | |
47622c44 | 38 | #define SD_OP_FLUSH_VDI 0x16 |
859e5553 | 39 | #define SD_OP_DEL_VDI 0x17 |
33b1db1c MK |
40 | |
41 | #define SD_FLAG_CMD_WRITE 0x01 | |
42 | #define SD_FLAG_CMD_COW 0x02 | |
0e7106d8 LY |
43 | #define SD_FLAG_CMD_CACHE 0x04 /* Writeback mode for cache */ |
44 | #define SD_FLAG_CMD_DIRECT 0x08 /* Don't use cache */ | |
33b1db1c MK |
45 | |
46 | #define SD_RES_SUCCESS 0x00 /* Success */ | |
47 | #define SD_RES_UNKNOWN 0x01 /* Unknown error */ | |
48 | #define SD_RES_NO_OBJ 0x02 /* No object found */ | |
49 | #define SD_RES_EIO 0x03 /* I/O error */ | |
50 | #define SD_RES_VDI_EXIST 0x04 /* Vdi exists already */ | |
51 | #define SD_RES_INVALID_PARMS 0x05 /* Invalid parameters */ | |
52 | #define SD_RES_SYSTEM_ERROR 0x06 /* System error */ | |
53 | #define SD_RES_VDI_LOCKED 0x07 /* Vdi is locked */ | |
54 | #define SD_RES_NO_VDI 0x08 /* No vdi found */ | |
55 | #define SD_RES_NO_BASE_VDI 0x09 /* No base vdi found */ | |
56 | #define SD_RES_VDI_READ 0x0A /* Cannot read requested vdi */ | |
57 | #define SD_RES_VDI_WRITE 0x0B /* Cannot write requested vdi */ | |
58 | #define SD_RES_BASE_VDI_READ 0x0C /* Cannot read base vdi */ | |
59 | #define SD_RES_BASE_VDI_WRITE 0x0D /* Cannot write base vdi */ | |
60 | #define SD_RES_NO_TAG 0x0E /* Requested tag is not found */ | |
61 | #define SD_RES_STARTUP 0x0F /* Sheepdog is on starting up */ | |
62 | #define SD_RES_VDI_NOT_LOCKED 0x10 /* Vdi is not locked */ | |
63 | #define SD_RES_SHUTDOWN 0x11 /* Sheepdog is shutting down */ | |
64 | #define SD_RES_NO_MEM 0x12 /* Cannot allocate memory */ | |
65 | #define SD_RES_FULL_VDI 0x13 /* we already have the maximum vdis */ | |
66 | #define SD_RES_VER_MISMATCH 0x14 /* Protocol version mismatch */ | |
67 | #define SD_RES_NO_SPACE 0x15 /* Server has no room for new objects */ | |
68 | #define SD_RES_WAIT_FOR_FORMAT 0x16 /* Waiting for a format operation */ | |
69 | #define SD_RES_WAIT_FOR_JOIN 0x17 /* Waiting for other nodes joining */ | |
70 | #define SD_RES_JOIN_FAILED 0x18 /* Target node had failed to join sheepdog */ | |
fca23f0a | 71 | #define SD_RES_HALT 0x19 /* Sheepdog is stopped serving IO request */ |
6a0b5490 | 72 | #define SD_RES_READONLY 0x1A /* Object is read-only */ |
33b1db1c MK |
73 | |
74 | /* | |
75 | * Object ID rules | |
76 | * | |
77 | * 0 - 19 (20 bits): data object space | |
78 | * 20 - 31 (12 bits): reserved data object space | |
79 | * 32 - 55 (24 bits): vdi object space | |
80 | * 56 - 59 ( 4 bits): reserved vdi object space | |
7acae208 | 81 | * 60 - 63 ( 4 bits): object type identifier space |
33b1db1c MK |
82 | */ |
83 | ||
84 | #define VDI_SPACE_SHIFT 32 | |
85 | #define VDI_BIT (UINT64_C(1) << 63) | |
86 | #define VMSTATE_BIT (UINT64_C(1) << 62) | |
87 | #define MAX_DATA_OBJS (UINT64_C(1) << 20) | |
88 | #define MAX_CHILDREN 1024 | |
89 | #define SD_MAX_VDI_LEN 256 | |
90 | #define SD_MAX_VDI_TAG_LEN 256 | |
91 | #define SD_NR_VDIS (1U << 24) | |
92 | #define SD_DATA_OBJ_SIZE (UINT64_C(1) << 22) | |
93 | #define SD_MAX_VDI_SIZE (SD_DATA_OBJ_SIZE * MAX_DATA_OBJS) | |
33b1db1c MK |
94 | |
95 | #define SD_INODE_SIZE (sizeof(SheepdogInode)) | |
96 | #define CURRENT_VDI_ID 0 | |
97 | ||
98 | typedef struct SheepdogReq { | |
99 | uint8_t proto_ver; | |
100 | uint8_t opcode; | |
101 | uint16_t flags; | |
102 | uint32_t epoch; | |
103 | uint32_t id; | |
104 | uint32_t data_length; | |
105 | uint32_t opcode_specific[8]; | |
106 | } SheepdogReq; | |
107 | ||
108 | typedef struct SheepdogRsp { | |
109 | uint8_t proto_ver; | |
110 | uint8_t opcode; | |
111 | uint16_t flags; | |
112 | uint32_t epoch; | |
113 | uint32_t id; | |
114 | uint32_t data_length; | |
115 | uint32_t result; | |
116 | uint32_t opcode_specific[7]; | |
117 | } SheepdogRsp; | |
118 | ||
119 | typedef struct SheepdogObjReq { | |
120 | uint8_t proto_ver; | |
121 | uint8_t opcode; | |
122 | uint16_t flags; | |
123 | uint32_t epoch; | |
124 | uint32_t id; | |
125 | uint32_t data_length; | |
126 | uint64_t oid; | |
127 | uint64_t cow_oid; | |
128 | uint32_t copies; | |
129 | uint32_t rsvd; | |
130 | uint64_t offset; | |
131 | } SheepdogObjReq; | |
132 | ||
133 | typedef struct SheepdogObjRsp { | |
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 | uint32_t result; | |
141 | uint32_t copies; | |
142 | uint32_t pad[6]; | |
143 | } SheepdogObjRsp; | |
144 | ||
145 | typedef struct SheepdogVdiReq { | |
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 vdi_size; | |
6f74c260 | 153 | uint32_t vdi_id; |
33b1db1c MK |
154 | uint32_t copies; |
155 | uint32_t snapid; | |
156 | uint32_t pad[3]; | |
157 | } SheepdogVdiReq; | |
158 | ||
159 | typedef struct SheepdogVdiRsp { | |
160 | uint8_t proto_ver; | |
161 | uint8_t opcode; | |
162 | uint16_t flags; | |
163 | uint32_t epoch; | |
164 | uint32_t id; | |
165 | uint32_t data_length; | |
166 | uint32_t result; | |
167 | uint32_t rsvd; | |
168 | uint32_t vdi_id; | |
169 | uint32_t pad[5]; | |
170 | } SheepdogVdiRsp; | |
171 | ||
172 | typedef struct SheepdogInode { | |
173 | char name[SD_MAX_VDI_LEN]; | |
174 | char tag[SD_MAX_VDI_TAG_LEN]; | |
175 | uint64_t ctime; | |
176 | uint64_t snap_ctime; | |
177 | uint64_t vm_clock_nsec; | |
178 | uint64_t vdi_size; | |
179 | uint64_t vm_state_size; | |
180 | uint16_t copy_policy; | |
181 | uint8_t nr_copies; | |
182 | uint8_t block_size_shift; | |
183 | uint32_t snap_id; | |
184 | uint32_t vdi_id; | |
185 | uint32_t parent_vdi_id; | |
186 | uint32_t child_vdi_id[MAX_CHILDREN]; | |
187 | uint32_t data_vdi_id[MAX_DATA_OBJS]; | |
188 | } SheepdogInode; | |
189 | ||
190 | /* | |
191 | * 64 bit FNV-1a non-zero initial basis | |
192 | */ | |
193 | #define FNV1A_64_INIT ((uint64_t)0xcbf29ce484222325ULL) | |
194 | ||
195 | /* | |
196 | * 64 bit Fowler/Noll/Vo FNV-1a hash code | |
197 | */ | |
198 | static inline uint64_t fnv_64a_buf(void *buf, size_t len, uint64_t hval) | |
199 | { | |
200 | unsigned char *bp = buf; | |
201 | unsigned char *be = bp + len; | |
202 | while (bp < be) { | |
203 | hval ^= (uint64_t) *bp++; | |
204 | hval += (hval << 1) + (hval << 4) + (hval << 5) + | |
205 | (hval << 7) + (hval << 8) + (hval << 40); | |
206 | } | |
207 | return hval; | |
208 | } | |
209 | ||
2f536801 | 210 | static inline bool is_data_obj_writable(SheepdogInode *inode, unsigned int idx) |
33b1db1c MK |
211 | { |
212 | return inode->vdi_id == inode->data_vdi_id[idx]; | |
213 | } | |
214 | ||
2f536801 | 215 | static inline bool is_data_obj(uint64_t oid) |
33b1db1c MK |
216 | { |
217 | return !(VDI_BIT & oid); | |
218 | } | |
219 | ||
220 | static inline uint64_t data_oid_to_idx(uint64_t oid) | |
221 | { | |
222 | return oid & (MAX_DATA_OBJS - 1); | |
223 | } | |
224 | ||
225 | static inline uint64_t vid_to_vdi_oid(uint32_t vid) | |
226 | { | |
227 | return VDI_BIT | ((uint64_t)vid << VDI_SPACE_SHIFT); | |
228 | } | |
229 | ||
230 | static inline uint64_t vid_to_vmstate_oid(uint32_t vid, uint32_t idx) | |
231 | { | |
232 | return VMSTATE_BIT | ((uint64_t)vid << VDI_SPACE_SHIFT) | idx; | |
233 | } | |
234 | ||
235 | static inline uint64_t vid_to_data_oid(uint32_t vid, uint32_t idx) | |
236 | { | |
237 | return ((uint64_t)vid << VDI_SPACE_SHIFT) | idx; | |
238 | } | |
239 | ||
2f536801 | 240 | static inline bool is_snapshot(struct SheepdogInode *inode) |
33b1db1c MK |
241 | { |
242 | return !!inode->snap_ctime; | |
243 | } | |
244 | ||
2440a2c3 | 245 | #undef DPRINTF |
33b1db1c | 246 | #ifdef DEBUG_SDOG |
2440a2c3 | 247 | #define DPRINTF(fmt, args...) \ |
33b1db1c MK |
248 | do { \ |
249 | fprintf(stdout, "%s %d: " fmt, __func__, __LINE__, ##args); \ | |
250 | } while (0) | |
251 | #else | |
2440a2c3 | 252 | #define DPRINTF(fmt, args...) |
33b1db1c MK |
253 | #endif |
254 | ||
255 | typedef struct SheepdogAIOCB SheepdogAIOCB; | |
256 | ||
257 | typedef struct AIOReq { | |
258 | SheepdogAIOCB *aiocb; | |
259 | unsigned int iov_offset; | |
260 | ||
261 | uint64_t oid; | |
262 | uint64_t base_oid; | |
263 | uint64_t offset; | |
264 | unsigned int data_len; | |
265 | uint8_t flags; | |
266 | uint32_t id; | |
267 | ||
c292ee6a | 268 | QLIST_ENTRY(AIOReq) aio_siblings; |
33b1db1c MK |
269 | } AIOReq; |
270 | ||
271 | enum AIOCBState { | |
272 | AIOCB_WRITE_UDATA, | |
273 | AIOCB_READ_UDATA, | |
47783072 | 274 | AIOCB_FLUSH_CACHE, |
cac8f4a6 | 275 | AIOCB_DISCARD_OBJ, |
33b1db1c MK |
276 | }; |
277 | ||
278 | struct SheepdogAIOCB { | |
279 | BlockDriverAIOCB common; | |
280 | ||
281 | QEMUIOVector *qiov; | |
282 | ||
283 | int64_t sector_num; | |
284 | int nb_sectors; | |
285 | ||
286 | int ret; | |
287 | enum AIOCBState aiocb_type; | |
288 | ||
2df46246 | 289 | Coroutine *coroutine; |
33b1db1c MK |
290 | void (*aio_done_func)(SheepdogAIOCB *); |
291 | ||
2f536801 | 292 | bool canceled; |
1d732d7d | 293 | int nr_pending; |
33b1db1c MK |
294 | }; |
295 | ||
296 | typedef struct BDRVSheepdogState { | |
297 | SheepdogInode inode; | |
298 | ||
299 | uint32_t min_dirty_data_idx; | |
300 | uint32_t max_dirty_data_idx; | |
301 | ||
302 | char name[SD_MAX_VDI_LEN]; | |
2f536801 | 303 | bool is_snapshot; |
0e7106d8 | 304 | uint32_t cache_flags; |
cac8f4a6 | 305 | bool discard_supported; |
33b1db1c | 306 | |
25af257d | 307 | char *host_spec; |
1b8bbb46 | 308 | bool is_unix; |
33b1db1c MK |
309 | int fd; |
310 | ||
2df46246 MK |
311 | CoMutex lock; |
312 | Coroutine *co_send; | |
313 | Coroutine *co_recv; | |
314 | ||
33b1db1c | 315 | uint32_t aioreq_seq_num; |
c292ee6a MK |
316 | QLIST_HEAD(inflight_aio_head, AIOReq) inflight_aio_head; |
317 | QLIST_HEAD(pending_aio_head, AIOReq) pending_aio_head; | |
33b1db1c MK |
318 | } BDRVSheepdogState; |
319 | ||
320 | static const char * sd_strerror(int err) | |
321 | { | |
322 | int i; | |
323 | ||
324 | static const struct { | |
325 | int err; | |
326 | const char *desc; | |
327 | } errors[] = { | |
328 | {SD_RES_SUCCESS, "Success"}, | |
329 | {SD_RES_UNKNOWN, "Unknown error"}, | |
330 | {SD_RES_NO_OBJ, "No object found"}, | |
331 | {SD_RES_EIO, "I/O error"}, | |
332 | {SD_RES_VDI_EXIST, "VDI exists already"}, | |
333 | {SD_RES_INVALID_PARMS, "Invalid parameters"}, | |
334 | {SD_RES_SYSTEM_ERROR, "System error"}, | |
335 | {SD_RES_VDI_LOCKED, "VDI is already locked"}, | |
336 | {SD_RES_NO_VDI, "No vdi found"}, | |
337 | {SD_RES_NO_BASE_VDI, "No base VDI found"}, | |
338 | {SD_RES_VDI_READ, "Failed read the requested VDI"}, | |
339 | {SD_RES_VDI_WRITE, "Failed to write the requested VDI"}, | |
340 | {SD_RES_BASE_VDI_READ, "Failed to read the base VDI"}, | |
341 | {SD_RES_BASE_VDI_WRITE, "Failed to write the base VDI"}, | |
342 | {SD_RES_NO_TAG, "Failed to find the requested tag"}, | |
343 | {SD_RES_STARTUP, "The system is still booting"}, | |
344 | {SD_RES_VDI_NOT_LOCKED, "VDI isn't locked"}, | |
345 | {SD_RES_SHUTDOWN, "The system is shutting down"}, | |
346 | {SD_RES_NO_MEM, "Out of memory on the server"}, | |
347 | {SD_RES_FULL_VDI, "We already have the maximum vdis"}, | |
348 | {SD_RES_VER_MISMATCH, "Protocol version mismatch"}, | |
349 | {SD_RES_NO_SPACE, "Server has no space for new objects"}, | |
350 | {SD_RES_WAIT_FOR_FORMAT, "Sheepdog is waiting for a format operation"}, | |
351 | {SD_RES_WAIT_FOR_JOIN, "Sheepdog is waiting for other nodes joining"}, | |
352 | {SD_RES_JOIN_FAILED, "Target node had failed to join sheepdog"}, | |
fca23f0a | 353 | {SD_RES_HALT, "Sheepdog is stopped serving IO request"}, |
6a0b5490 | 354 | {SD_RES_READONLY, "Object is read-only"}, |
33b1db1c MK |
355 | }; |
356 | ||
357 | for (i = 0; i < ARRAY_SIZE(errors); ++i) { | |
358 | if (errors[i].err == err) { | |
359 | return errors[i].desc; | |
360 | } | |
361 | } | |
362 | ||
363 | return "Invalid error code"; | |
364 | } | |
365 | ||
366 | /* | |
367 | * Sheepdog I/O handling: | |
368 | * | |
2df46246 | 369 | * 1. In sd_co_rw_vector, we send the I/O requests to the server and |
c292ee6a | 370 | * link the requests to the inflight_list in the |
2df46246 MK |
371 | * BDRVSheepdogState. The function exits without waiting for |
372 | * receiving the response. | |
33b1db1c | 373 | * |
2df46246 | 374 | * 2. We receive the response in aio_read_response, the fd handler to |
33b1db1c MK |
375 | * the sheepdog connection. If metadata update is needed, we send |
376 | * the write request to the vdi object in sd_write_done, the write | |
2df46246 MK |
377 | * completion function. We switch back to sd_co_readv/writev after |
378 | * all the requests belonging to the AIOCB are finished. | |
33b1db1c MK |
379 | */ |
380 | ||
381 | static inline AIOReq *alloc_aio_req(BDRVSheepdogState *s, SheepdogAIOCB *acb, | |
382 | uint64_t oid, unsigned int data_len, | |
383 | uint64_t offset, uint8_t flags, | |
384 | uint64_t base_oid, unsigned int iov_offset) | |
385 | { | |
386 | AIOReq *aio_req; | |
387 | ||
7267c094 | 388 | aio_req = g_malloc(sizeof(*aio_req)); |
33b1db1c MK |
389 | aio_req->aiocb = acb; |
390 | aio_req->iov_offset = iov_offset; | |
391 | aio_req->oid = oid; | |
392 | aio_req->base_oid = base_oid; | |
393 | aio_req->offset = offset; | |
394 | aio_req->data_len = data_len; | |
395 | aio_req->flags = flags; | |
396 | aio_req->id = s->aioreq_seq_num++; | |
397 | ||
1d732d7d | 398 | acb->nr_pending++; |
33b1db1c MK |
399 | return aio_req; |
400 | } | |
401 | ||
1d732d7d | 402 | static inline void free_aio_req(BDRVSheepdogState *s, AIOReq *aio_req) |
33b1db1c MK |
403 | { |
404 | SheepdogAIOCB *acb = aio_req->aiocb; | |
1d732d7d | 405 | |
c292ee6a | 406 | QLIST_REMOVE(aio_req, aio_siblings); |
7267c094 | 407 | g_free(aio_req); |
33b1db1c | 408 | |
1d732d7d | 409 | acb->nr_pending--; |
33b1db1c MK |
410 | } |
411 | ||
d8716b41 | 412 | static void coroutine_fn sd_finish_aiocb(SheepdogAIOCB *acb) |
33b1db1c MK |
413 | { |
414 | if (!acb->canceled) { | |
2df46246 | 415 | qemu_coroutine_enter(acb->coroutine, NULL); |
33b1db1c MK |
416 | } |
417 | qemu_aio_release(acb); | |
418 | } | |
419 | ||
420 | static void sd_aio_cancel(BlockDriverAIOCB *blockacb) | |
421 | { | |
422 | SheepdogAIOCB *acb = (SheepdogAIOCB *)blockacb; | |
423 | ||
424 | /* | |
425 | * Sheepdog cannot cancel the requests which are already sent to | |
426 | * the servers, so we just complete the request with -EIO here. | |
427 | */ | |
2df46246 MK |
428 | acb->ret = -EIO; |
429 | qemu_coroutine_enter(acb->coroutine, NULL); | |
2f536801 | 430 | acb->canceled = true; |
33b1db1c MK |
431 | } |
432 | ||
d7331bed | 433 | static const AIOCBInfo sd_aiocb_info = { |
33b1db1c MK |
434 | .aiocb_size = sizeof(SheepdogAIOCB), |
435 | .cancel = sd_aio_cancel, | |
436 | }; | |
437 | ||
438 | static SheepdogAIOCB *sd_aio_setup(BlockDriverState *bs, QEMUIOVector *qiov, | |
f700f8e3 | 439 | int64_t sector_num, int nb_sectors) |
33b1db1c MK |
440 | { |
441 | SheepdogAIOCB *acb; | |
442 | ||
f700f8e3 | 443 | acb = qemu_aio_get(&sd_aiocb_info, bs, NULL, NULL); |
33b1db1c MK |
444 | |
445 | acb->qiov = qiov; | |
446 | ||
447 | acb->sector_num = sector_num; | |
448 | acb->nb_sectors = nb_sectors; | |
449 | ||
450 | acb->aio_done_func = NULL; | |
2f536801 | 451 | acb->canceled = false; |
2df46246 | 452 | acb->coroutine = qemu_coroutine_self(); |
33b1db1c | 453 | acb->ret = 0; |
1d732d7d | 454 | acb->nr_pending = 0; |
33b1db1c MK |
455 | return acb; |
456 | } | |
457 | ||
25af257d | 458 | static int connect_to_sdog(BDRVSheepdogState *s) |
33b1db1c | 459 | { |
25af257d MK |
460 | int fd; |
461 | Error *err = NULL; | |
33b1db1c | 462 | |
1b8bbb46 MK |
463 | if (s->is_unix) { |
464 | fd = unix_connect(s->host_spec, &err); | |
465 | } else { | |
466 | fd = inet_connect(s->host_spec, &err); | |
467 | ||
468 | if (err == NULL) { | |
469 | int ret = socket_set_nodelay(fd); | |
470 | if (ret < 0) { | |
471 | error_report("%s", strerror(errno)); | |
472 | } | |
473 | } | |
474 | } | |
33b1db1c | 475 | |
25af257d MK |
476 | if (err != NULL) { |
477 | qerror_report_err(err); | |
478 | error_free(err); | |
0d6db300 | 479 | } else { |
f9e8cacc | 480 | qemu_set_nonblock(fd); |
33b1db1c MK |
481 | } |
482 | ||
33b1db1c MK |
483 | return fd; |
484 | } | |
485 | ||
e0d93a89 MK |
486 | static coroutine_fn int send_co_req(int sockfd, SheepdogReq *hdr, void *data, |
487 | unsigned int *wlen) | |
47622c44 LY |
488 | { |
489 | int ret; | |
490 | ||
491 | ret = qemu_co_send(sockfd, hdr, sizeof(*hdr)); | |
492 | if (ret < sizeof(*hdr)) { | |
493 | error_report("failed to send a req, %s", strerror(errno)); | |
eb092180 | 494 | return ret; |
47622c44 LY |
495 | } |
496 | ||
497 | ret = qemu_co_send(sockfd, data, *wlen); | |
498 | if (ret < *wlen) { | |
499 | error_report("failed to send a req, %s", strerror(errno)); | |
500 | } | |
501 | ||
502 | return ret; | |
503 | } | |
e0d93a89 | 504 | |
2dfcca3b MK |
505 | static void restart_co_req(void *opaque) |
506 | { | |
507 | Coroutine *co = opaque; | |
508 | ||
509 | qemu_coroutine_enter(co, NULL); | |
510 | } | |
511 | ||
cddd4ac7 MK |
512 | typedef struct SheepdogReqCo { |
513 | int sockfd; | |
514 | SheepdogReq *hdr; | |
515 | void *data; | |
516 | unsigned int *wlen; | |
517 | unsigned int *rlen; | |
518 | int ret; | |
519 | bool finished; | |
520 | } SheepdogReqCo; | |
521 | ||
522 | static coroutine_fn void do_co_req(void *opaque) | |
47622c44 LY |
523 | { |
524 | int ret; | |
2dfcca3b | 525 | Coroutine *co; |
cddd4ac7 MK |
526 | SheepdogReqCo *srco = opaque; |
527 | int sockfd = srco->sockfd; | |
528 | SheepdogReq *hdr = srco->hdr; | |
529 | void *data = srco->data; | |
530 | unsigned int *wlen = srco->wlen; | |
531 | unsigned int *rlen = srco->rlen; | |
2dfcca3b MK |
532 | |
533 | co = qemu_coroutine_self(); | |
f2e5dca4 | 534 | qemu_aio_set_fd_handler(sockfd, NULL, restart_co_req, co); |
47622c44 | 535 | |
47622c44 LY |
536 | ret = send_co_req(sockfd, hdr, data, wlen); |
537 | if (ret < 0) { | |
538 | goto out; | |
539 | } | |
540 | ||
f2e5dca4 | 541 | qemu_aio_set_fd_handler(sockfd, restart_co_req, NULL, co); |
2dfcca3b | 542 | |
47622c44 LY |
543 | ret = qemu_co_recv(sockfd, hdr, sizeof(*hdr)); |
544 | if (ret < sizeof(*hdr)) { | |
545 | error_report("failed to get a rsp, %s", strerror(errno)); | |
cb595887 | 546 | ret = -errno; |
47622c44 LY |
547 | goto out; |
548 | } | |
549 | ||
550 | if (*rlen > hdr->data_length) { | |
551 | *rlen = hdr->data_length; | |
552 | } | |
553 | ||
554 | if (*rlen) { | |
555 | ret = qemu_co_recv(sockfd, data, *rlen); | |
556 | if (ret < *rlen) { | |
557 | error_report("failed to get the data, %s", strerror(errno)); | |
cb595887 | 558 | ret = -errno; |
47622c44 LY |
559 | goto out; |
560 | } | |
561 | } | |
562 | ret = 0; | |
563 | out: | |
ed9ba724 MK |
564 | /* there is at most one request for this sockfd, so it is safe to |
565 | * set each handler to NULL. */ | |
f2e5dca4 | 566 | qemu_aio_set_fd_handler(sockfd, NULL, NULL, NULL); |
cddd4ac7 MK |
567 | |
568 | srco->ret = ret; | |
569 | srco->finished = true; | |
570 | } | |
571 | ||
572 | static int do_req(int sockfd, SheepdogReq *hdr, void *data, | |
573 | unsigned int *wlen, unsigned int *rlen) | |
574 | { | |
575 | Coroutine *co; | |
576 | SheepdogReqCo srco = { | |
577 | .sockfd = sockfd, | |
578 | .hdr = hdr, | |
579 | .data = data, | |
580 | .wlen = wlen, | |
581 | .rlen = rlen, | |
582 | .ret = 0, | |
583 | .finished = false, | |
584 | }; | |
585 | ||
586 | if (qemu_in_coroutine()) { | |
587 | do_co_req(&srco); | |
588 | } else { | |
589 | co = qemu_coroutine_create(do_co_req); | |
590 | qemu_coroutine_enter(co, &srco); | |
591 | while (!srco.finished) { | |
592 | qemu_aio_wait(); | |
593 | } | |
594 | } | |
595 | ||
596 | return srco.ret; | |
47622c44 LY |
597 | } |
598 | ||
d8716b41 | 599 | static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, |
2f536801 | 600 | struct iovec *iov, int niov, bool create, |
33b1db1c | 601 | enum AIOCBState aiocb_type); |
13c31de2 | 602 | static int coroutine_fn resend_aioreq(BDRVSheepdogState *s, AIOReq *aio_req); |
33b1db1c | 603 | |
7dc1cde0 MK |
604 | |
605 | static AIOReq *find_pending_req(BDRVSheepdogState *s, uint64_t oid) | |
606 | { | |
607 | AIOReq *aio_req; | |
608 | ||
609 | QLIST_FOREACH(aio_req, &s->pending_aio_head, aio_siblings) { | |
610 | if (aio_req->oid == oid) { | |
611 | return aio_req; | |
612 | } | |
613 | } | |
614 | ||
615 | return NULL; | |
616 | } | |
617 | ||
33b1db1c MK |
618 | /* |
619 | * This function searchs pending requests to the object `oid', and | |
620 | * sends them. | |
621 | */ | |
c292ee6a | 622 | static void coroutine_fn send_pending_req(BDRVSheepdogState *s, uint64_t oid) |
33b1db1c | 623 | { |
7dc1cde0 | 624 | AIOReq *aio_req; |
33b1db1c MK |
625 | SheepdogAIOCB *acb; |
626 | int ret; | |
627 | ||
7dc1cde0 | 628 | while ((aio_req = find_pending_req(s, oid)) != NULL) { |
33b1db1c | 629 | acb = aio_req->aiocb; |
c292ee6a MK |
630 | /* move aio_req from pending list to inflight one */ |
631 | QLIST_REMOVE(aio_req, aio_siblings); | |
632 | QLIST_INSERT_HEAD(&s->inflight_aio_head, aio_req, aio_siblings); | |
33b1db1c | 633 | ret = add_aio_request(s, aio_req, acb->qiov->iov, |
2f536801 | 634 | acb->qiov->niov, false, acb->aiocb_type); |
33b1db1c | 635 | if (ret < 0) { |
6daf194d | 636 | error_report("add_aio_request is failed"); |
33b1db1c | 637 | free_aio_req(s, aio_req); |
1d732d7d | 638 | if (!acb->nr_pending) { |
33b1db1c MK |
639 | sd_finish_aiocb(acb); |
640 | } | |
641 | } | |
642 | } | |
643 | } | |
644 | ||
645 | /* | |
646 | * Receive responses of the I/O requests. | |
647 | * | |
648 | * This function is registered as a fd handler, and called from the | |
649 | * main loop when s->fd is ready for reading responses. | |
650 | */ | |
d8716b41 | 651 | static void coroutine_fn aio_read_response(void *opaque) |
33b1db1c MK |
652 | { |
653 | SheepdogObjRsp rsp; | |
654 | BDRVSheepdogState *s = opaque; | |
655 | int fd = s->fd; | |
656 | int ret; | |
657 | AIOReq *aio_req = NULL; | |
658 | SheepdogAIOCB *acb; | |
cac8f4a6 | 659 | uint64_t idx; |
33b1db1c | 660 | |
c292ee6a | 661 | if (QLIST_EMPTY(&s->inflight_aio_head)) { |
2df46246 | 662 | goto out; |
33b1db1c MK |
663 | } |
664 | ||
665 | /* read a header */ | |
8c5135f9 PB |
666 | ret = qemu_co_recv(fd, &rsp, sizeof(rsp)); |
667 | if (ret < 0) { | |
6daf194d | 668 | error_report("failed to get the header, %s", strerror(errno)); |
2df46246 | 669 | goto out; |
33b1db1c MK |
670 | } |
671 | ||
c292ee6a MK |
672 | /* find the right aio_req from the inflight aio list */ |
673 | QLIST_FOREACH(aio_req, &s->inflight_aio_head, aio_siblings) { | |
33b1db1c MK |
674 | if (aio_req->id == rsp.id) { |
675 | break; | |
676 | } | |
677 | } | |
678 | if (!aio_req) { | |
6daf194d | 679 | error_report("cannot find aio_req %x", rsp.id); |
2df46246 | 680 | goto out; |
33b1db1c MK |
681 | } |
682 | ||
683 | acb = aio_req->aiocb; | |
684 | ||
685 | switch (acb->aiocb_type) { | |
686 | case AIOCB_WRITE_UDATA: | |
6d1acda8 MK |
687 | /* this coroutine context is no longer suitable for co_recv |
688 | * because we may send data to update vdi objects */ | |
689 | s->co_recv = NULL; | |
33b1db1c MK |
690 | if (!is_data_obj(aio_req->oid)) { |
691 | break; | |
692 | } | |
693 | idx = data_oid_to_idx(aio_req->oid); | |
694 | ||
695 | if (s->inode.data_vdi_id[idx] != s->inode.vdi_id) { | |
696 | /* | |
697 | * If the object is newly created one, we need to update | |
698 | * the vdi object (metadata object). min_dirty_data_idx | |
699 | * and max_dirty_data_idx are changed to include updated | |
700 | * index between them. | |
701 | */ | |
bd751f22 LY |
702 | if (rsp.result == SD_RES_SUCCESS) { |
703 | s->inode.data_vdi_id[idx] = s->inode.vdi_id; | |
704 | s->max_dirty_data_idx = MAX(idx, s->max_dirty_data_idx); | |
705 | s->min_dirty_data_idx = MIN(idx, s->min_dirty_data_idx); | |
706 | } | |
33b1db1c MK |
707 | /* |
708 | * Some requests may be blocked because simultaneous | |
709 | * create requests are not allowed, so we search the | |
710 | * pending requests here. | |
711 | */ | |
d6b1ef89 | 712 | send_pending_req(s, aio_req->oid); |
33b1db1c MK |
713 | } |
714 | break; | |
715 | case AIOCB_READ_UDATA: | |
2fc8ae1d MT |
716 | ret = qemu_co_recvv(fd, acb->qiov->iov, acb->qiov->niov, |
717 | aio_req->iov_offset, rsp.data_length); | |
8c5135f9 | 718 | if (ret < 0) { |
6daf194d | 719 | error_report("failed to get the data, %s", strerror(errno)); |
2df46246 | 720 | goto out; |
33b1db1c MK |
721 | } |
722 | break; | |
47783072 LY |
723 | case AIOCB_FLUSH_CACHE: |
724 | if (rsp.result == SD_RES_INVALID_PARMS) { | |
2440a2c3 | 725 | DPRINTF("disable cache since the server doesn't support it\n"); |
47783072 LY |
726 | s->cache_flags = SD_FLAG_CMD_DIRECT; |
727 | rsp.result = SD_RES_SUCCESS; | |
728 | } | |
729 | break; | |
cac8f4a6 LY |
730 | case AIOCB_DISCARD_OBJ: |
731 | switch (rsp.result) { | |
732 | case SD_RES_INVALID_PARMS: | |
733 | error_report("sheep(%s) doesn't support discard command", | |
734 | s->host_spec); | |
735 | rsp.result = SD_RES_SUCCESS; | |
736 | s->discard_supported = false; | |
737 | break; | |
738 | case SD_RES_SUCCESS: | |
739 | idx = data_oid_to_idx(aio_req->oid); | |
740 | s->inode.data_vdi_id[idx] = 0; | |
741 | break; | |
742 | default: | |
743 | break; | |
744 | } | |
33b1db1c MK |
745 | } |
746 | ||
13c31de2 MK |
747 | switch (rsp.result) { |
748 | case SD_RES_SUCCESS: | |
749 | break; | |
750 | case SD_RES_READONLY: | |
751 | ret = resend_aioreq(s, aio_req); | |
752 | if (ret == SD_RES_SUCCESS) { | |
753 | goto out; | |
754 | } | |
755 | /* fall through */ | |
756 | default: | |
33b1db1c | 757 | acb->ret = -EIO; |
6daf194d | 758 | error_report("%s", sd_strerror(rsp.result)); |
13c31de2 | 759 | break; |
33b1db1c MK |
760 | } |
761 | ||
1d732d7d MK |
762 | free_aio_req(s, aio_req); |
763 | if (!acb->nr_pending) { | |
33b1db1c MK |
764 | /* |
765 | * We've finished all requests which belong to the AIOCB, so | |
2df46246 | 766 | * we can switch back to sd_co_readv/writev now. |
33b1db1c MK |
767 | */ |
768 | acb->aio_done_func(acb); | |
769 | } | |
2df46246 MK |
770 | out: |
771 | s->co_recv = NULL; | |
772 | } | |
773 | ||
774 | static void co_read_response(void *opaque) | |
775 | { | |
776 | BDRVSheepdogState *s = opaque; | |
777 | ||
778 | if (!s->co_recv) { | |
779 | s->co_recv = qemu_coroutine_create(aio_read_response); | |
780 | } | |
781 | ||
782 | qemu_coroutine_enter(s->co_recv, opaque); | |
783 | } | |
784 | ||
785 | static void co_write_request(void *opaque) | |
786 | { | |
787 | BDRVSheepdogState *s = opaque; | |
788 | ||
789 | qemu_coroutine_enter(s->co_send, NULL); | |
33b1db1c MK |
790 | } |
791 | ||
33b1db1c MK |
792 | /* |
793 | * Return a socket discriptor to read/write objects. | |
794 | * | |
795 | * We cannot use this discriptor for other operations because | |
796 | * the block driver may be on waiting response from the server. | |
797 | */ | |
798 | static int get_sheep_fd(BDRVSheepdogState *s) | |
799 | { | |
1b8bbb46 | 800 | int fd; |
33b1db1c | 801 | |
25af257d | 802 | fd = connect_to_sdog(s); |
33b1db1c | 803 | if (fd < 0) { |
cb595887 | 804 | return fd; |
33b1db1c MK |
805 | } |
806 | ||
f2e5dca4 | 807 | qemu_aio_set_fd_handler(fd, co_read_response, NULL, s); |
33b1db1c MK |
808 | return fd; |
809 | } | |
810 | ||
5d6768e3 MK |
811 | static int sd_parse_uri(BDRVSheepdogState *s, const char *filename, |
812 | char *vdi, uint32_t *snapid, char *tag) | |
813 | { | |
814 | URI *uri; | |
815 | QueryParams *qp = NULL; | |
816 | int ret = 0; | |
817 | ||
818 | uri = uri_parse(filename); | |
819 | if (!uri) { | |
820 | return -EINVAL; | |
821 | } | |
822 | ||
1b8bbb46 MK |
823 | /* transport */ |
824 | if (!strcmp(uri->scheme, "sheepdog")) { | |
825 | s->is_unix = false; | |
826 | } else if (!strcmp(uri->scheme, "sheepdog+tcp")) { | |
827 | s->is_unix = false; | |
828 | } else if (!strcmp(uri->scheme, "sheepdog+unix")) { | |
829 | s->is_unix = true; | |
830 | } else { | |
831 | ret = -EINVAL; | |
832 | goto out; | |
833 | } | |
834 | ||
5d6768e3 MK |
835 | if (uri->path == NULL || !strcmp(uri->path, "/")) { |
836 | ret = -EINVAL; | |
837 | goto out; | |
838 | } | |
839 | pstrcpy(vdi, SD_MAX_VDI_LEN, uri->path + 1); | |
840 | ||
1b8bbb46 MK |
841 | qp = query_params_parse(uri->query); |
842 | if (qp->n > 1 || (s->is_unix && !qp->n) || (!s->is_unix && qp->n)) { | |
843 | ret = -EINVAL; | |
844 | goto out; | |
845 | } | |
846 | ||
847 | if (s->is_unix) { | |
848 | /* sheepdog+unix:///vdiname?socket=path */ | |
849 | if (uri->server || uri->port || strcmp(qp->p[0].name, "socket")) { | |
850 | ret = -EINVAL; | |
851 | goto out; | |
852 | } | |
853 | s->host_spec = g_strdup(qp->p[0].value); | |
854 | } else { | |
855 | /* sheepdog[+tcp]://[host:port]/vdiname */ | |
856 | s->host_spec = g_strdup_printf("%s:%d", uri->server ?: SD_DEFAULT_ADDR, | |
857 | uri->port ?: SD_DEFAULT_PORT); | |
858 | } | |
5d6768e3 MK |
859 | |
860 | /* snapshot tag */ | |
861 | if (uri->fragment) { | |
862 | *snapid = strtoul(uri->fragment, NULL, 10); | |
863 | if (*snapid == 0) { | |
864 | pstrcpy(tag, SD_MAX_VDI_TAG_LEN, uri->fragment); | |
865 | } | |
866 | } else { | |
867 | *snapid = CURRENT_VDI_ID; /* search current vdi */ | |
868 | } | |
869 | ||
870 | out: | |
871 | if (qp) { | |
872 | query_params_free(qp); | |
873 | } | |
874 | uri_free(uri); | |
875 | return ret; | |
876 | } | |
877 | ||
33b1db1c | 878 | /* |
5d6768e3 | 879 | * Parse a filename (old syntax) |
33b1db1c MK |
880 | * |
881 | * filename must be one of the following formats: | |
882 | * 1. [vdiname] | |
883 | * 2. [vdiname]:[snapid] | |
884 | * 3. [vdiname]:[tag] | |
885 | * 4. [hostname]:[port]:[vdiname] | |
886 | * 5. [hostname]:[port]:[vdiname]:[snapid] | |
887 | * 6. [hostname]:[port]:[vdiname]:[tag] | |
888 | * | |
889 | * You can boot from the snapshot images by specifying `snapid` or | |
890 | * `tag'. | |
891 | * | |
892 | * You can run VMs outside the Sheepdog cluster by specifying | |
893 | * `hostname' and `port' (experimental). | |
894 | */ | |
895 | static int parse_vdiname(BDRVSheepdogState *s, const char *filename, | |
896 | char *vdi, uint32_t *snapid, char *tag) | |
897 | { | |
5d6768e3 MK |
898 | char *p, *q, *uri; |
899 | const char *host_spec, *vdi_spec; | |
900 | int nr_sep, ret; | |
33b1db1c | 901 | |
5d6768e3 | 902 | strstart(filename, "sheepdog:", (const char **)&filename); |
7267c094 | 903 | p = q = g_strdup(filename); |
33b1db1c MK |
904 | |
905 | /* count the number of separators */ | |
906 | nr_sep = 0; | |
907 | while (*p) { | |
908 | if (*p == ':') { | |
909 | nr_sep++; | |
910 | } | |
911 | p++; | |
912 | } | |
913 | p = q; | |
914 | ||
5d6768e3 | 915 | /* use the first two tokens as host_spec. */ |
33b1db1c | 916 | if (nr_sep >= 2) { |
5d6768e3 | 917 | host_spec = p; |
33b1db1c | 918 | p = strchr(p, ':'); |
5d6768e3 | 919 | p++; |
33b1db1c MK |
920 | p = strchr(p, ':'); |
921 | *p++ = '\0'; | |
922 | } else { | |
5d6768e3 | 923 | host_spec = ""; |
33b1db1c MK |
924 | } |
925 | ||
5d6768e3 | 926 | vdi_spec = p; |
33b1db1c | 927 | |
5d6768e3 | 928 | p = strchr(vdi_spec, ':'); |
33b1db1c | 929 | if (p) { |
5d6768e3 | 930 | *p++ = '#'; |
33b1db1c MK |
931 | } |
932 | ||
5d6768e3 | 933 | uri = g_strdup_printf("sheepdog://%s/%s", host_spec, vdi_spec); |
33b1db1c | 934 | |
5d6768e3 MK |
935 | ret = sd_parse_uri(s, uri, vdi, snapid, tag); |
936 | ||
937 | g_free(q); | |
938 | g_free(uri); | |
939 | ||
940 | return ret; | |
33b1db1c MK |
941 | } |
942 | ||
982dcbf4 MK |
943 | static int find_vdi_name(BDRVSheepdogState *s, const char *filename, |
944 | uint32_t snapid, const char *tag, uint32_t *vid, | |
945 | bool lock) | |
33b1db1c MK |
946 | { |
947 | int ret, fd; | |
948 | SheepdogVdiReq hdr; | |
949 | SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; | |
950 | unsigned int wlen, rlen = 0; | |
951 | char buf[SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN]; | |
952 | ||
25af257d | 953 | fd = connect_to_sdog(s); |
33b1db1c | 954 | if (fd < 0) { |
cb595887 | 955 | return fd; |
33b1db1c MK |
956 | } |
957 | ||
3178e275 JM |
958 | /* This pair of strncpy calls ensures that the buffer is zero-filled, |
959 | * which is desirable since we'll soon be sending those bytes, and | |
960 | * don't want the send_req to read uninitialized data. | |
961 | */ | |
33b1db1c MK |
962 | strncpy(buf, filename, SD_MAX_VDI_LEN); |
963 | strncpy(buf + SD_MAX_VDI_LEN, tag, SD_MAX_VDI_TAG_LEN); | |
964 | ||
965 | memset(&hdr, 0, sizeof(hdr)); | |
982dcbf4 | 966 | if (lock) { |
33b1db1c | 967 | hdr.opcode = SD_OP_LOCK_VDI; |
982dcbf4 MK |
968 | } else { |
969 | hdr.opcode = SD_OP_GET_VDI_INFO; | |
33b1db1c MK |
970 | } |
971 | wlen = SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN; | |
972 | hdr.proto_ver = SD_PROTO_VER; | |
973 | hdr.data_length = wlen; | |
974 | hdr.snapid = snapid; | |
975 | hdr.flags = SD_FLAG_CMD_WRITE; | |
976 | ||
977 | ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen); | |
978 | if (ret) { | |
33b1db1c MK |
979 | goto out; |
980 | } | |
981 | ||
982 | if (rsp->result != SD_RES_SUCCESS) { | |
6daf194d | 983 | error_report("cannot get vdi info, %s, %s %d %s", |
33b1db1c | 984 | sd_strerror(rsp->result), filename, snapid, tag); |
cb595887 MK |
985 | if (rsp->result == SD_RES_NO_VDI) { |
986 | ret = -ENOENT; | |
987 | } else { | |
988 | ret = -EIO; | |
989 | } | |
33b1db1c MK |
990 | goto out; |
991 | } | |
992 | *vid = rsp->vdi_id; | |
993 | ||
994 | ret = 0; | |
995 | out: | |
996 | closesocket(fd); | |
997 | return ret; | |
998 | } | |
999 | ||
d8716b41 | 1000 | static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, |
2f536801 | 1001 | struct iovec *iov, int niov, bool create, |
33b1db1c MK |
1002 | enum AIOCBState aiocb_type) |
1003 | { | |
1004 | int nr_copies = s->inode.nr_copies; | |
1005 | SheepdogObjReq hdr; | |
47783072 | 1006 | unsigned int wlen = 0; |
33b1db1c MK |
1007 | int ret; |
1008 | uint64_t oid = aio_req->oid; | |
1009 | unsigned int datalen = aio_req->data_len; | |
1010 | uint64_t offset = aio_req->offset; | |
1011 | uint8_t flags = aio_req->flags; | |
1012 | uint64_t old_oid = aio_req->base_oid; | |
1013 | ||
1014 | if (!nr_copies) { | |
6daf194d | 1015 | error_report("bug"); |
33b1db1c MK |
1016 | } |
1017 | ||
1018 | memset(&hdr, 0, sizeof(hdr)); | |
1019 | ||
47783072 LY |
1020 | switch (aiocb_type) { |
1021 | case AIOCB_FLUSH_CACHE: | |
1022 | hdr.opcode = SD_OP_FLUSH_VDI; | |
1023 | break; | |
1024 | case AIOCB_READ_UDATA: | |
33b1db1c MK |
1025 | hdr.opcode = SD_OP_READ_OBJ; |
1026 | hdr.flags = flags; | |
47783072 LY |
1027 | break; |
1028 | case AIOCB_WRITE_UDATA: | |
1029 | if (create) { | |
1030 | hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ; | |
1031 | } else { | |
1032 | hdr.opcode = SD_OP_WRITE_OBJ; | |
1033 | } | |
33b1db1c | 1034 | wlen = datalen; |
33b1db1c | 1035 | hdr.flags = SD_FLAG_CMD_WRITE | flags; |
47783072 | 1036 | break; |
cac8f4a6 LY |
1037 | case AIOCB_DISCARD_OBJ: |
1038 | hdr.opcode = SD_OP_DISCARD_OBJ; | |
1039 | break; | |
33b1db1c MK |
1040 | } |
1041 | ||
0e7106d8 LY |
1042 | if (s->cache_flags) { |
1043 | hdr.flags |= s->cache_flags; | |
47622c44 LY |
1044 | } |
1045 | ||
33b1db1c MK |
1046 | hdr.oid = oid; |
1047 | hdr.cow_oid = old_oid; | |
1048 | hdr.copies = s->inode.nr_copies; | |
1049 | ||
1050 | hdr.data_length = datalen; | |
1051 | hdr.offset = offset; | |
1052 | ||
1053 | hdr.id = aio_req->id; | |
1054 | ||
2df46246 MK |
1055 | qemu_co_mutex_lock(&s->lock); |
1056 | s->co_send = qemu_coroutine_self(); | |
f2e5dca4 | 1057 | qemu_aio_set_fd_handler(s->fd, co_read_response, co_write_request, s); |
128aa589 | 1058 | socket_set_cork(s->fd, 1); |
33b1db1c MK |
1059 | |
1060 | /* send a header */ | |
8c5135f9 PB |
1061 | ret = qemu_co_send(s->fd, &hdr, sizeof(hdr)); |
1062 | if (ret < 0) { | |
c3fecea5 | 1063 | qemu_co_mutex_unlock(&s->lock); |
6daf194d | 1064 | error_report("failed to send a req, %s", strerror(errno)); |
cb595887 | 1065 | return -errno; |
33b1db1c MK |
1066 | } |
1067 | ||
1068 | if (wlen) { | |
2fc8ae1d | 1069 | ret = qemu_co_sendv(s->fd, iov, niov, aio_req->iov_offset, wlen); |
8c5135f9 | 1070 | if (ret < 0) { |
c3fecea5 | 1071 | qemu_co_mutex_unlock(&s->lock); |
6daf194d | 1072 | error_report("failed to send a data, %s", strerror(errno)); |
cb595887 | 1073 | return -errno; |
33b1db1c MK |
1074 | } |
1075 | } | |
1076 | ||
128aa589 | 1077 | socket_set_cork(s->fd, 0); |
f2e5dca4 | 1078 | qemu_aio_set_fd_handler(s->fd, co_read_response, NULL, s); |
2df46246 | 1079 | qemu_co_mutex_unlock(&s->lock); |
33b1db1c MK |
1080 | |
1081 | return 0; | |
1082 | } | |
1083 | ||
1084 | static int read_write_object(int fd, char *buf, uint64_t oid, int copies, | |
1085 | unsigned int datalen, uint64_t offset, | |
0e7106d8 | 1086 | bool write, bool create, uint32_t cache_flags) |
33b1db1c MK |
1087 | { |
1088 | SheepdogObjReq hdr; | |
1089 | SheepdogObjRsp *rsp = (SheepdogObjRsp *)&hdr; | |
1090 | unsigned int wlen, rlen; | |
1091 | int ret; | |
1092 | ||
1093 | memset(&hdr, 0, sizeof(hdr)); | |
1094 | ||
1095 | if (write) { | |
1096 | wlen = datalen; | |
1097 | rlen = 0; | |
1098 | hdr.flags = SD_FLAG_CMD_WRITE; | |
1099 | if (create) { | |
1100 | hdr.opcode = SD_OP_CREATE_AND_WRITE_OBJ; | |
1101 | } else { | |
1102 | hdr.opcode = SD_OP_WRITE_OBJ; | |
1103 | } | |
1104 | } else { | |
1105 | wlen = 0; | |
1106 | rlen = datalen; | |
1107 | hdr.opcode = SD_OP_READ_OBJ; | |
1108 | } | |
47622c44 | 1109 | |
0e7106d8 | 1110 | hdr.flags |= cache_flags; |
47622c44 | 1111 | |
33b1db1c MK |
1112 | hdr.oid = oid; |
1113 | hdr.data_length = datalen; | |
1114 | hdr.offset = offset; | |
1115 | hdr.copies = copies; | |
1116 | ||
1117 | ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen); | |
1118 | if (ret) { | |
6daf194d | 1119 | error_report("failed to send a request to the sheep"); |
cb595887 | 1120 | return ret; |
33b1db1c MK |
1121 | } |
1122 | ||
1123 | switch (rsp->result) { | |
1124 | case SD_RES_SUCCESS: | |
1125 | return 0; | |
1126 | default: | |
6daf194d | 1127 | error_report("%s", sd_strerror(rsp->result)); |
cb595887 | 1128 | return -EIO; |
33b1db1c MK |
1129 | } |
1130 | } | |
1131 | ||
1132 | static int read_object(int fd, char *buf, uint64_t oid, int copies, | |
0e7106d8 LY |
1133 | unsigned int datalen, uint64_t offset, |
1134 | uint32_t cache_flags) | |
33b1db1c | 1135 | { |
2f536801 | 1136 | return read_write_object(fd, buf, oid, copies, datalen, offset, false, |
0e7106d8 | 1137 | false, cache_flags); |
33b1db1c MK |
1138 | } |
1139 | ||
1140 | static int write_object(int fd, char *buf, uint64_t oid, int copies, | |
2f536801 | 1141 | unsigned int datalen, uint64_t offset, bool create, |
0e7106d8 | 1142 | uint32_t cache_flags) |
33b1db1c | 1143 | { |
2f536801 | 1144 | return read_write_object(fd, buf, oid, copies, datalen, offset, true, |
0e7106d8 | 1145 | create, cache_flags); |
33b1db1c MK |
1146 | } |
1147 | ||
9ff53a0e MK |
1148 | /* update inode with the latest state */ |
1149 | static int reload_inode(BDRVSheepdogState *s, uint32_t snapid, const char *tag) | |
1150 | { | |
1151 | SheepdogInode *inode; | |
1152 | int ret = 0, fd; | |
1153 | uint32_t vid = 0; | |
1154 | ||
1155 | fd = connect_to_sdog(s); | |
1156 | if (fd < 0) { | |
1157 | return -EIO; | |
1158 | } | |
1159 | ||
1160 | inode = g_malloc(sizeof(s->inode)); | |
1161 | ||
1162 | ret = find_vdi_name(s, s->name, snapid, tag, &vid, false); | |
1163 | if (ret) { | |
1164 | goto out; | |
1165 | } | |
1166 | ||
1167 | ret = read_object(fd, (char *)inode, vid_to_vdi_oid(vid), | |
1168 | s->inode.nr_copies, sizeof(*inode), 0, s->cache_flags); | |
1169 | if (ret < 0) { | |
1170 | goto out; | |
1171 | } | |
1172 | ||
1173 | if (inode->vdi_id != s->inode.vdi_id) { | |
1174 | memcpy(&s->inode, inode, sizeof(s->inode)); | |
1175 | } | |
1176 | ||
1177 | out: | |
1178 | g_free(inode); | |
1179 | closesocket(fd); | |
1180 | ||
1181 | return ret; | |
1182 | } | |
1183 | ||
13c31de2 MK |
1184 | static int coroutine_fn resend_aioreq(BDRVSheepdogState *s, AIOReq *aio_req) |
1185 | { | |
1186 | SheepdogAIOCB *acb = aio_req->aiocb; | |
1187 | bool create = false; | |
1188 | int ret; | |
1189 | ||
1190 | ret = reload_inode(s, 0, ""); | |
1191 | if (ret < 0) { | |
1192 | return ret; | |
1193 | } | |
1194 | ||
1195 | aio_req->oid = vid_to_data_oid(s->inode.vdi_id, | |
1196 | data_oid_to_idx(aio_req->oid)); | |
1197 | ||
1198 | /* check whether this request becomes a CoW one */ | |
1199 | if (acb->aiocb_type == AIOCB_WRITE_UDATA) { | |
1200 | int idx = data_oid_to_idx(aio_req->oid); | |
1201 | AIOReq *areq; | |
1202 | ||
1203 | if (s->inode.data_vdi_id[idx] == 0) { | |
1204 | create = true; | |
1205 | goto out; | |
1206 | } | |
1207 | if (is_data_obj_writable(&s->inode, idx)) { | |
1208 | goto out; | |
1209 | } | |
1210 | ||
1211 | /* link to the pending list if there is another CoW request to | |
1212 | * the same object */ | |
1213 | QLIST_FOREACH(areq, &s->inflight_aio_head, aio_siblings) { | |
1214 | if (areq != aio_req && areq->oid == aio_req->oid) { | |
2440a2c3 | 1215 | DPRINTF("simultaneous CoW to %" PRIx64 "\n", aio_req->oid); |
13c31de2 MK |
1216 | QLIST_REMOVE(aio_req, aio_siblings); |
1217 | QLIST_INSERT_HEAD(&s->pending_aio_head, aio_req, aio_siblings); | |
1218 | return SD_RES_SUCCESS; | |
1219 | } | |
1220 | } | |
1221 | ||
1222 | aio_req->base_oid = vid_to_data_oid(s->inode.data_vdi_id[idx], idx); | |
1223 | aio_req->flags |= SD_FLAG_CMD_COW; | |
1224 | create = true; | |
1225 | } | |
1226 | out: | |
1227 | return add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov, | |
1228 | create, acb->aiocb_type); | |
1229 | } | |
1230 | ||
c8c96350 KW |
1231 | /* TODO Convert to fine grained options */ |
1232 | static QemuOptsList runtime_opts = { | |
1233 | .name = "sheepdog", | |
1234 | .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), | |
1235 | .desc = { | |
1236 | { | |
1237 | .name = "filename", | |
1238 | .type = QEMU_OPT_STRING, | |
1239 | .help = "URL to the sheepdog image", | |
1240 | }, | |
1241 | { /* end of list */ } | |
1242 | }, | |
1243 | }; | |
1244 | ||
56d1b4d2 | 1245 | static int sd_open(BlockDriverState *bs, QDict *options, int flags) |
33b1db1c MK |
1246 | { |
1247 | int ret, fd; | |
1248 | uint32_t vid = 0; | |
1249 | BDRVSheepdogState *s = bs->opaque; | |
1250 | char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN]; | |
1251 | uint32_t snapid; | |
1252 | char *buf = NULL; | |
c8c96350 KW |
1253 | QemuOpts *opts; |
1254 | Error *local_err = NULL; | |
1255 | const char *filename; | |
1256 | ||
1257 | opts = qemu_opts_create_nofail(&runtime_opts); | |
1258 | qemu_opts_absorb_qdict(opts, options, &local_err); | |
1259 | if (error_is_set(&local_err)) { | |
1260 | qerror_report_err(local_err); | |
1261 | error_free(local_err); | |
1262 | ret = -EINVAL; | |
1263 | goto out; | |
1264 | } | |
1265 | ||
1266 | filename = qemu_opt_get(opts, "filename"); | |
33b1db1c | 1267 | |
c292ee6a MK |
1268 | QLIST_INIT(&s->inflight_aio_head); |
1269 | QLIST_INIT(&s->pending_aio_head); | |
33b1db1c MK |
1270 | s->fd = -1; |
1271 | ||
1272 | memset(vdi, 0, sizeof(vdi)); | |
1273 | memset(tag, 0, sizeof(tag)); | |
5d6768e3 MK |
1274 | |
1275 | if (strstr(filename, "://")) { | |
1276 | ret = sd_parse_uri(s, filename, vdi, &snapid, tag); | |
1277 | } else { | |
1278 | ret = parse_vdiname(s, filename, vdi, &snapid, tag); | |
1279 | } | |
1280 | if (ret < 0) { | |
33b1db1c MK |
1281 | goto out; |
1282 | } | |
1283 | s->fd = get_sheep_fd(s); | |
1284 | if (s->fd < 0) { | |
cb595887 | 1285 | ret = s->fd; |
33b1db1c MK |
1286 | goto out; |
1287 | } | |
1288 | ||
982dcbf4 | 1289 | ret = find_vdi_name(s, vdi, snapid, tag, &vid, true); |
33b1db1c MK |
1290 | if (ret) { |
1291 | goto out; | |
1292 | } | |
1293 | ||
0e7106d8 LY |
1294 | /* |
1295 | * QEMU block layer emulates writethrough cache as 'writeback + flush', so | |
1296 | * we always set SD_FLAG_CMD_CACHE (writeback cache) as default. | |
1297 | */ | |
1298 | s->cache_flags = SD_FLAG_CMD_CACHE; | |
1299 | if (flags & BDRV_O_NOCACHE) { | |
1300 | s->cache_flags = SD_FLAG_CMD_DIRECT; | |
1301 | } | |
cac8f4a6 | 1302 | s->discard_supported = true; |
0e7106d8 | 1303 | |
622b6057 | 1304 | if (snapid || tag[0] != '\0') { |
2440a2c3 | 1305 | DPRINTF("%" PRIx32 " snapshot inode was open.\n", vid); |
2f536801 | 1306 | s->is_snapshot = true; |
33b1db1c MK |
1307 | } |
1308 | ||
25af257d | 1309 | fd = connect_to_sdog(s); |
33b1db1c | 1310 | if (fd < 0) { |
cb595887 | 1311 | ret = fd; |
33b1db1c MK |
1312 | goto out; |
1313 | } | |
1314 | ||
7267c094 | 1315 | buf = g_malloc(SD_INODE_SIZE); |
47622c44 | 1316 | ret = read_object(fd, buf, vid_to_vdi_oid(vid), 0, SD_INODE_SIZE, 0, |
0e7106d8 | 1317 | s->cache_flags); |
33b1db1c MK |
1318 | |
1319 | closesocket(fd); | |
1320 | ||
1321 | if (ret) { | |
1322 | goto out; | |
1323 | } | |
1324 | ||
1325 | memcpy(&s->inode, buf, sizeof(s->inode)); | |
1326 | s->min_dirty_data_idx = UINT32_MAX; | |
1327 | s->max_dirty_data_idx = 0; | |
1328 | ||
e8bfaa2f | 1329 | bs->total_sectors = s->inode.vdi_size / BDRV_SECTOR_SIZE; |
3178e275 | 1330 | pstrcpy(s->name, sizeof(s->name), vdi); |
2df46246 | 1331 | qemu_co_mutex_init(&s->lock); |
c8c96350 | 1332 | qemu_opts_del(opts); |
7267c094 | 1333 | g_free(buf); |
33b1db1c MK |
1334 | return 0; |
1335 | out: | |
f2e5dca4 | 1336 | qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL); |
33b1db1c MK |
1337 | if (s->fd >= 0) { |
1338 | closesocket(s->fd); | |
1339 | } | |
c8c96350 | 1340 | qemu_opts_del(opts); |
7267c094 | 1341 | g_free(buf); |
cb595887 | 1342 | return ret; |
33b1db1c MK |
1343 | } |
1344 | ||
25af257d MK |
1345 | static int do_sd_create(BDRVSheepdogState *s, char *filename, int64_t vdi_size, |
1346 | uint32_t base_vid, uint32_t *vdi_id, int snapshot) | |
33b1db1c MK |
1347 | { |
1348 | SheepdogVdiReq hdr; | |
1349 | SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; | |
1350 | int fd, ret; | |
1351 | unsigned int wlen, rlen = 0; | |
1352 | char buf[SD_MAX_VDI_LEN]; | |
1353 | ||
25af257d | 1354 | fd = connect_to_sdog(s); |
33b1db1c | 1355 | if (fd < 0) { |
cb595887 | 1356 | return fd; |
33b1db1c MK |
1357 | } |
1358 | ||
3178e275 JM |
1359 | /* FIXME: would it be better to fail (e.g., return -EIO) when filename |
1360 | * does not fit in buf? For now, just truncate and avoid buffer overrun. | |
1361 | */ | |
33b1db1c | 1362 | memset(buf, 0, sizeof(buf)); |
3178e275 | 1363 | pstrcpy(buf, sizeof(buf), filename); |
33b1db1c MK |
1364 | |
1365 | memset(&hdr, 0, sizeof(hdr)); | |
1366 | hdr.opcode = SD_OP_NEW_VDI; | |
6f74c260 | 1367 | hdr.vdi_id = base_vid; |
33b1db1c MK |
1368 | |
1369 | wlen = SD_MAX_VDI_LEN; | |
1370 | ||
1371 | hdr.flags = SD_FLAG_CMD_WRITE; | |
1372 | hdr.snapid = snapshot; | |
1373 | ||
1374 | hdr.data_length = wlen; | |
1375 | hdr.vdi_size = vdi_size; | |
1376 | ||
1377 | ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen); | |
1378 | ||
1379 | closesocket(fd); | |
1380 | ||
1381 | if (ret) { | |
cb595887 | 1382 | return ret; |
33b1db1c MK |
1383 | } |
1384 | ||
1385 | if (rsp->result != SD_RES_SUCCESS) { | |
6daf194d | 1386 | error_report("%s, %s", sd_strerror(rsp->result), filename); |
33b1db1c MK |
1387 | return -EIO; |
1388 | } | |
1389 | ||
1390 | if (vdi_id) { | |
1391 | *vdi_id = rsp->vdi_id; | |
1392 | } | |
1393 | ||
1394 | return 0; | |
1395 | } | |
1396 | ||
a8e0fdd7 MK |
1397 | static int sd_prealloc(const char *filename) |
1398 | { | |
1399 | BlockDriverState *bs = NULL; | |
1400 | uint32_t idx, max_idx; | |
1401 | int64_t vdi_size; | |
7267c094 | 1402 | void *buf = g_malloc0(SD_DATA_OBJ_SIZE); |
a8e0fdd7 MK |
1403 | int ret; |
1404 | ||
787e4a85 | 1405 | ret = bdrv_file_open(&bs, filename, NULL, BDRV_O_RDWR); |
a8e0fdd7 MK |
1406 | if (ret < 0) { |
1407 | goto out; | |
1408 | } | |
1409 | ||
1410 | vdi_size = bdrv_getlength(bs); | |
1411 | if (vdi_size < 0) { | |
1412 | ret = vdi_size; | |
1413 | goto out; | |
1414 | } | |
1415 | max_idx = DIV_ROUND_UP(vdi_size, SD_DATA_OBJ_SIZE); | |
1416 | ||
1417 | for (idx = 0; idx < max_idx; idx++) { | |
1418 | /* | |
1419 | * The created image can be a cloned image, so we need to read | |
1420 | * a data from the source image. | |
1421 | */ | |
1422 | ret = bdrv_pread(bs, idx * SD_DATA_OBJ_SIZE, buf, SD_DATA_OBJ_SIZE); | |
1423 | if (ret < 0) { | |
1424 | goto out; | |
1425 | } | |
1426 | ret = bdrv_pwrite(bs, idx * SD_DATA_OBJ_SIZE, buf, SD_DATA_OBJ_SIZE); | |
1427 | if (ret < 0) { | |
1428 | goto out; | |
1429 | } | |
1430 | } | |
1431 | out: | |
1432 | if (bs) { | |
4f6fd349 | 1433 | bdrv_unref(bs); |
a8e0fdd7 | 1434 | } |
7267c094 | 1435 | g_free(buf); |
a8e0fdd7 MK |
1436 | |
1437 | return ret; | |
1438 | } | |
1439 | ||
33b1db1c MK |
1440 | static int sd_create(const char *filename, QEMUOptionParameter *options) |
1441 | { | |
b6fc8245 | 1442 | int ret = 0; |
b4447363 | 1443 | uint32_t vid = 0, base_vid = 0; |
33b1db1c MK |
1444 | int64_t vdi_size = 0; |
1445 | char *backing_file = NULL; | |
b6fc8245 | 1446 | BDRVSheepdogState *s; |
b4447363 MK |
1447 | char vdi[SD_MAX_VDI_LEN], tag[SD_MAX_VDI_TAG_LEN]; |
1448 | uint32_t snapid; | |
2f536801 | 1449 | bool prealloc = false; |
33b1db1c | 1450 | |
b6fc8245 MK |
1451 | s = g_malloc0(sizeof(BDRVSheepdogState)); |
1452 | ||
b4447363 MK |
1453 | memset(vdi, 0, sizeof(vdi)); |
1454 | memset(tag, 0, sizeof(tag)); | |
5d6768e3 MK |
1455 | if (strstr(filename, "://")) { |
1456 | ret = sd_parse_uri(s, filename, vdi, &snapid, tag); | |
1457 | } else { | |
1458 | ret = parse_vdiname(s, filename, vdi, &snapid, tag); | |
1459 | } | |
1460 | if (ret < 0) { | |
b6fc8245 | 1461 | goto out; |
b4447363 MK |
1462 | } |
1463 | ||
33b1db1c MK |
1464 | while (options && options->name) { |
1465 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
1466 | vdi_size = options->value.n; | |
1467 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
1468 | backing_file = options->value.s; | |
a8e0fdd7 MK |
1469 | } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { |
1470 | if (!options->value.s || !strcmp(options->value.s, "off")) { | |
2f536801 | 1471 | prealloc = false; |
a8e0fdd7 | 1472 | } else if (!strcmp(options->value.s, "full")) { |
2f536801 | 1473 | prealloc = true; |
a8e0fdd7 MK |
1474 | } else { |
1475 | error_report("Invalid preallocation mode: '%s'", | |
1476 | options->value.s); | |
b6fc8245 MK |
1477 | ret = -EINVAL; |
1478 | goto out; | |
a8e0fdd7 | 1479 | } |
33b1db1c MK |
1480 | } |
1481 | options++; | |
1482 | } | |
1483 | ||
1484 | if (vdi_size > SD_MAX_VDI_SIZE) { | |
6daf194d | 1485 | error_report("too big image size"); |
b6fc8245 MK |
1486 | ret = -EINVAL; |
1487 | goto out; | |
33b1db1c MK |
1488 | } |
1489 | ||
1490 | if (backing_file) { | |
1491 | BlockDriverState *bs; | |
1492 | BDRVSheepdogState *s; | |
1493 | BlockDriver *drv; | |
1494 | ||
1495 | /* Currently, only Sheepdog backing image is supported. */ | |
98289620 | 1496 | drv = bdrv_find_protocol(backing_file, true); |
33b1db1c | 1497 | if (!drv || strcmp(drv->protocol_name, "sheepdog") != 0) { |
6daf194d | 1498 | error_report("backing_file must be a sheepdog image"); |
b6fc8245 MK |
1499 | ret = -EINVAL; |
1500 | goto out; | |
33b1db1c MK |
1501 | } |
1502 | ||
787e4a85 | 1503 | ret = bdrv_file_open(&bs, backing_file, NULL, 0); |
cb595887 | 1504 | if (ret < 0) { |
b6fc8245 | 1505 | goto out; |
cb595887 | 1506 | } |
33b1db1c MK |
1507 | |
1508 | s = bs->opaque; | |
1509 | ||
1510 | if (!is_snapshot(&s->inode)) { | |
6daf194d | 1511 | error_report("cannot clone from a non snapshot vdi"); |
4f6fd349 | 1512 | bdrv_unref(bs); |
b6fc8245 MK |
1513 | ret = -EINVAL; |
1514 | goto out; | |
33b1db1c MK |
1515 | } |
1516 | ||
b4447363 | 1517 | base_vid = s->inode.vdi_id; |
4f6fd349 | 1518 | bdrv_unref(bs); |
33b1db1c MK |
1519 | } |
1520 | ||
25af257d | 1521 | ret = do_sd_create(s, vdi, vdi_size, base_vid, &vid, 0); |
a8e0fdd7 | 1522 | if (!prealloc || ret) { |
b6fc8245 | 1523 | goto out; |
a8e0fdd7 MK |
1524 | } |
1525 | ||
b6fc8245 MK |
1526 | ret = sd_prealloc(filename); |
1527 | out: | |
1528 | g_free(s); | |
1529 | return ret; | |
33b1db1c MK |
1530 | } |
1531 | ||
1532 | static void sd_close(BlockDriverState *bs) | |
1533 | { | |
1534 | BDRVSheepdogState *s = bs->opaque; | |
1535 | SheepdogVdiReq hdr; | |
1536 | SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; | |
1537 | unsigned int wlen, rlen = 0; | |
1538 | int fd, ret; | |
1539 | ||
2440a2c3 | 1540 | DPRINTF("%s\n", s->name); |
33b1db1c | 1541 | |
25af257d | 1542 | fd = connect_to_sdog(s); |
33b1db1c MK |
1543 | if (fd < 0) { |
1544 | return; | |
1545 | } | |
1546 | ||
1547 | memset(&hdr, 0, sizeof(hdr)); | |
1548 | ||
1549 | hdr.opcode = SD_OP_RELEASE_VDI; | |
6f74c260 | 1550 | hdr.vdi_id = s->inode.vdi_id; |
33b1db1c MK |
1551 | wlen = strlen(s->name) + 1; |
1552 | hdr.data_length = wlen; | |
1553 | hdr.flags = SD_FLAG_CMD_WRITE; | |
1554 | ||
1555 | ret = do_req(fd, (SheepdogReq *)&hdr, s->name, &wlen, &rlen); | |
1556 | ||
1557 | closesocket(fd); | |
1558 | ||
1559 | if (!ret && rsp->result != SD_RES_SUCCESS && | |
1560 | rsp->result != SD_RES_VDI_NOT_LOCKED) { | |
6daf194d | 1561 | error_report("%s, %s", sd_strerror(rsp->result), s->name); |
33b1db1c MK |
1562 | } |
1563 | ||
f2e5dca4 | 1564 | qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL); |
33b1db1c | 1565 | closesocket(s->fd); |
25af257d | 1566 | g_free(s->host_spec); |
33b1db1c MK |
1567 | } |
1568 | ||
1569 | static int64_t sd_getlength(BlockDriverState *bs) | |
1570 | { | |
1571 | BDRVSheepdogState *s = bs->opaque; | |
1572 | ||
1573 | return s->inode.vdi_size; | |
1574 | } | |
1575 | ||
1576 | static int sd_truncate(BlockDriverState *bs, int64_t offset) | |
1577 | { | |
1578 | BDRVSheepdogState *s = bs->opaque; | |
1579 | int ret, fd; | |
1580 | unsigned int datalen; | |
1581 | ||
1582 | if (offset < s->inode.vdi_size) { | |
6daf194d | 1583 | error_report("shrinking is not supported"); |
33b1db1c MK |
1584 | return -EINVAL; |
1585 | } else if (offset > SD_MAX_VDI_SIZE) { | |
6daf194d | 1586 | error_report("too big image size"); |
33b1db1c MK |
1587 | return -EINVAL; |
1588 | } | |
1589 | ||
25af257d | 1590 | fd = connect_to_sdog(s); |
33b1db1c | 1591 | if (fd < 0) { |
cb595887 | 1592 | return fd; |
33b1db1c MK |
1593 | } |
1594 | ||
1595 | /* we don't need to update entire object */ | |
1596 | datalen = SD_INODE_SIZE - sizeof(s->inode.data_vdi_id); | |
1597 | s->inode.vdi_size = offset; | |
1598 | ret = write_object(fd, (char *)&s->inode, vid_to_vdi_oid(s->inode.vdi_id), | |
0e7106d8 | 1599 | s->inode.nr_copies, datalen, 0, false, s->cache_flags); |
33b1db1c MK |
1600 | close(fd); |
1601 | ||
1602 | if (ret < 0) { | |
6daf194d | 1603 | error_report("failed to update an inode."); |
33b1db1c MK |
1604 | } |
1605 | ||
cb595887 | 1606 | return ret; |
33b1db1c MK |
1607 | } |
1608 | ||
1609 | /* | |
1610 | * This function is called after writing data objects. If we need to | |
1611 | * update metadata, this sends a write request to the vdi object. | |
2df46246 | 1612 | * Otherwise, this switches back to sd_co_readv/writev. |
33b1db1c | 1613 | */ |
d8716b41 | 1614 | static void coroutine_fn sd_write_done(SheepdogAIOCB *acb) |
33b1db1c MK |
1615 | { |
1616 | int ret; | |
1617 | BDRVSheepdogState *s = acb->common.bs->opaque; | |
1618 | struct iovec iov; | |
1619 | AIOReq *aio_req; | |
1620 | uint32_t offset, data_len, mn, mx; | |
1621 | ||
1622 | mn = s->min_dirty_data_idx; | |
1623 | mx = s->max_dirty_data_idx; | |
1624 | if (mn <= mx) { | |
1625 | /* we need to update the vdi object. */ | |
1626 | offset = sizeof(s->inode) - sizeof(s->inode.data_vdi_id) + | |
1627 | mn * sizeof(s->inode.data_vdi_id[0]); | |
1628 | data_len = (mx - mn + 1) * sizeof(s->inode.data_vdi_id[0]); | |
1629 | ||
1630 | s->min_dirty_data_idx = UINT32_MAX; | |
1631 | s->max_dirty_data_idx = 0; | |
1632 | ||
1633 | iov.iov_base = &s->inode; | |
1634 | iov.iov_len = sizeof(s->inode); | |
1635 | aio_req = alloc_aio_req(s, acb, vid_to_vdi_oid(s->inode.vdi_id), | |
1636 | data_len, offset, 0, 0, offset); | |
c292ee6a | 1637 | QLIST_INSERT_HEAD(&s->inflight_aio_head, aio_req, aio_siblings); |
2f536801 | 1638 | ret = add_aio_request(s, aio_req, &iov, 1, false, AIOCB_WRITE_UDATA); |
33b1db1c MK |
1639 | if (ret) { |
1640 | free_aio_req(s, aio_req); | |
1641 | acb->ret = -EIO; | |
1642 | goto out; | |
1643 | } | |
1644 | ||
1645 | acb->aio_done_func = sd_finish_aiocb; | |
1646 | acb->aiocb_type = AIOCB_WRITE_UDATA; | |
1647 | return; | |
1648 | } | |
1649 | out: | |
1650 | sd_finish_aiocb(acb); | |
1651 | } | |
1652 | ||
859e5553 LY |
1653 | /* Delete current working VDI on the snapshot chain */ |
1654 | static bool sd_delete(BDRVSheepdogState *s) | |
1655 | { | |
1656 | unsigned int wlen = SD_MAX_VDI_LEN, rlen = 0; | |
1657 | SheepdogVdiReq hdr = { | |
1658 | .opcode = SD_OP_DEL_VDI, | |
1659 | .vdi_id = s->inode.vdi_id, | |
1660 | .data_length = wlen, | |
1661 | .flags = SD_FLAG_CMD_WRITE, | |
1662 | }; | |
1663 | SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr; | |
1664 | int fd, ret; | |
1665 | ||
1666 | fd = connect_to_sdog(s); | |
1667 | if (fd < 0) { | |
1668 | return false; | |
1669 | } | |
1670 | ||
1671 | ret = do_req(fd, (SheepdogReq *)&hdr, s->name, &wlen, &rlen); | |
1672 | closesocket(fd); | |
1673 | if (ret) { | |
1674 | return false; | |
1675 | } | |
1676 | switch (rsp->result) { | |
1677 | case SD_RES_NO_VDI: | |
1678 | error_report("%s was already deleted", s->name); | |
1679 | /* fall through */ | |
1680 | case SD_RES_SUCCESS: | |
1681 | break; | |
1682 | default: | |
1683 | error_report("%s, %s", sd_strerror(rsp->result), s->name); | |
1684 | return false; | |
1685 | } | |
1686 | ||
1687 | return true; | |
1688 | } | |
1689 | ||
33b1db1c MK |
1690 | /* |
1691 | * Create a writable VDI from a snapshot | |
1692 | */ | |
1693 | static int sd_create_branch(BDRVSheepdogState *s) | |
1694 | { | |
1695 | int ret, fd; | |
1696 | uint32_t vid; | |
1697 | char *buf; | |
859e5553 | 1698 | bool deleted; |
33b1db1c | 1699 | |
2440a2c3 | 1700 | DPRINTF("%" PRIx32 " is snapshot.\n", s->inode.vdi_id); |
33b1db1c | 1701 | |
7267c094 | 1702 | buf = g_malloc(SD_INODE_SIZE); |
33b1db1c | 1703 | |
859e5553 LY |
1704 | /* |
1705 | * Even If deletion fails, we will just create extra snapshot based on | |
1706 | * the workding VDI which was supposed to be deleted. So no need to | |
1707 | * false bail out. | |
1708 | */ | |
1709 | deleted = sd_delete(s); | |
1710 | ret = do_sd_create(s, s->name, s->inode.vdi_size, s->inode.vdi_id, &vid, | |
1711 | !deleted); | |
33b1db1c MK |
1712 | if (ret) { |
1713 | goto out; | |
1714 | } | |
1715 | ||
2440a2c3 | 1716 | DPRINTF("%" PRIx32 " is created.\n", vid); |
33b1db1c | 1717 | |
25af257d | 1718 | fd = connect_to_sdog(s); |
33b1db1c | 1719 | if (fd < 0) { |
cb595887 | 1720 | ret = fd; |
33b1db1c MK |
1721 | goto out; |
1722 | } | |
1723 | ||
1724 | ret = read_object(fd, buf, vid_to_vdi_oid(vid), s->inode.nr_copies, | |
0e7106d8 | 1725 | SD_INODE_SIZE, 0, s->cache_flags); |
33b1db1c MK |
1726 | |
1727 | closesocket(fd); | |
1728 | ||
1729 | if (ret < 0) { | |
1730 | goto out; | |
1731 | } | |
1732 | ||
1733 | memcpy(&s->inode, buf, sizeof(s->inode)); | |
1734 | ||
2f536801 | 1735 | s->is_snapshot = false; |
33b1db1c | 1736 | ret = 0; |
2440a2c3 | 1737 | DPRINTF("%" PRIx32 " was newly created.\n", s->inode.vdi_id); |
33b1db1c MK |
1738 | |
1739 | out: | |
7267c094 | 1740 | g_free(buf); |
33b1db1c MK |
1741 | |
1742 | return ret; | |
1743 | } | |
1744 | ||
1745 | /* | |
1746 | * Send I/O requests to the server. | |
1747 | * | |
1748 | * This function sends requests to the server, links the requests to | |
c292ee6a | 1749 | * the inflight_list in BDRVSheepdogState, and exits without |
33b1db1c MK |
1750 | * waiting the response. The responses are received in the |
1751 | * `aio_read_response' function which is called from the main loop as | |
1752 | * a fd handler. | |
2df46246 MK |
1753 | * |
1754 | * Returns 1 when we need to wait a response, 0 when there is no sent | |
1755 | * request and -errno in error cases. | |
33b1db1c | 1756 | */ |
d8716b41 | 1757 | static int coroutine_fn sd_co_rw_vector(void *p) |
33b1db1c MK |
1758 | { |
1759 | SheepdogAIOCB *acb = p; | |
1760 | int ret = 0; | |
e8bfaa2f LY |
1761 | unsigned long len, done = 0, total = acb->nb_sectors * BDRV_SECTOR_SIZE; |
1762 | unsigned long idx = acb->sector_num * BDRV_SECTOR_SIZE / SD_DATA_OBJ_SIZE; | |
33b1db1c | 1763 | uint64_t oid; |
e8bfaa2f | 1764 | uint64_t offset = (acb->sector_num * BDRV_SECTOR_SIZE) % SD_DATA_OBJ_SIZE; |
33b1db1c MK |
1765 | BDRVSheepdogState *s = acb->common.bs->opaque; |
1766 | SheepdogInode *inode = &s->inode; | |
1767 | AIOReq *aio_req; | |
1768 | ||
33b1db1c MK |
1769 | if (acb->aiocb_type == AIOCB_WRITE_UDATA && s->is_snapshot) { |
1770 | /* | |
1771 | * In the case we open the snapshot VDI, Sheepdog creates the | |
1772 | * writable VDI when we do a write operation first. | |
1773 | */ | |
1774 | ret = sd_create_branch(s); | |
1775 | if (ret) { | |
1776 | acb->ret = -EIO; | |
1777 | goto out; | |
1778 | } | |
1779 | } | |
1780 | ||
1d732d7d MK |
1781 | /* |
1782 | * Make sure we don't free the aiocb before we are done with all requests. | |
1783 | * This additional reference is dropped at the end of this function. | |
1784 | */ | |
1785 | acb->nr_pending++; | |
1786 | ||
33b1db1c MK |
1787 | while (done != total) { |
1788 | uint8_t flags = 0; | |
1789 | uint64_t old_oid = 0; | |
2f536801 | 1790 | bool create = false; |
33b1db1c MK |
1791 | |
1792 | oid = vid_to_data_oid(inode->data_vdi_id[idx], idx); | |
1793 | ||
1794 | len = MIN(total - done, SD_DATA_OBJ_SIZE - offset); | |
1795 | ||
19db9b90 CH |
1796 | switch (acb->aiocb_type) { |
1797 | case AIOCB_READ_UDATA: | |
1798 | if (!inode->data_vdi_id[idx]) { | |
1799 | qemu_iovec_memset(acb->qiov, done, 0, len); | |
33b1db1c MK |
1800 | goto done; |
1801 | } | |
19db9b90 CH |
1802 | break; |
1803 | case AIOCB_WRITE_UDATA: | |
1804 | if (!inode->data_vdi_id[idx]) { | |
2f536801 | 1805 | create = true; |
19db9b90 CH |
1806 | } else if (!is_data_obj_writable(inode, idx)) { |
1807 | /* Copy-On-Write */ | |
2f536801 | 1808 | create = true; |
19db9b90 CH |
1809 | old_oid = oid; |
1810 | flags = SD_FLAG_CMD_COW; | |
1811 | } | |
1812 | break; | |
cac8f4a6 LY |
1813 | case AIOCB_DISCARD_OBJ: |
1814 | /* | |
1815 | * We discard the object only when the whole object is | |
1816 | * 1) allocated 2) trimmed. Otherwise, simply skip it. | |
1817 | */ | |
1818 | if (len != SD_DATA_OBJ_SIZE || inode->data_vdi_id[idx] == 0) { | |
1819 | goto done; | |
1820 | } | |
1821 | break; | |
19db9b90 CH |
1822 | default: |
1823 | break; | |
33b1db1c MK |
1824 | } |
1825 | ||
1826 | if (create) { | |
2440a2c3 | 1827 | DPRINTF("update ino (%" PRIu32 ") %" PRIu64 " %" PRIu64 " %ld\n", |
1b6ac998 | 1828 | inode->vdi_id, oid, |
33b1db1c MK |
1829 | vid_to_data_oid(inode->data_vdi_id[idx], idx), idx); |
1830 | oid = vid_to_data_oid(inode->vdi_id, idx); | |
2440a2c3 | 1831 | DPRINTF("new oid %" PRIx64 "\n", oid); |
33b1db1c MK |
1832 | } |
1833 | ||
1834 | aio_req = alloc_aio_req(s, acb, oid, len, offset, flags, old_oid, done); | |
1835 | ||
1836 | if (create) { | |
1837 | AIOReq *areq; | |
c292ee6a | 1838 | QLIST_FOREACH(areq, &s->inflight_aio_head, aio_siblings) { |
33b1db1c MK |
1839 | if (areq->oid == oid) { |
1840 | /* | |
1841 | * Sheepdog cannot handle simultaneous create | |
1842 | * requests to the same object. So we cannot send | |
1843 | * the request until the previous request | |
1844 | * finishes. | |
1845 | */ | |
1846 | aio_req->flags = 0; | |
1847 | aio_req->base_oid = 0; | |
c292ee6a MK |
1848 | QLIST_INSERT_HEAD(&s->pending_aio_head, aio_req, |
1849 | aio_siblings); | |
33b1db1c MK |
1850 | goto done; |
1851 | } | |
1852 | } | |
1853 | } | |
1854 | ||
c292ee6a | 1855 | QLIST_INSERT_HEAD(&s->inflight_aio_head, aio_req, aio_siblings); |
33b1db1c MK |
1856 | ret = add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov, |
1857 | create, acb->aiocb_type); | |
1858 | if (ret < 0) { | |
6daf194d | 1859 | error_report("add_aio_request is failed"); |
33b1db1c MK |
1860 | free_aio_req(s, aio_req); |
1861 | acb->ret = -EIO; | |
1862 | goto out; | |
1863 | } | |
1864 | done: | |
1865 | offset = 0; | |
1866 | idx++; | |
1867 | done += len; | |
1868 | } | |
1869 | out: | |
1d732d7d | 1870 | if (!--acb->nr_pending) { |
2df46246 | 1871 | return acb->ret; |
33b1db1c | 1872 | } |
2df46246 | 1873 | return 1; |
33b1db1c MK |
1874 | } |
1875 | ||
a968168c | 1876 | static coroutine_fn int sd_co_writev(BlockDriverState *bs, int64_t sector_num, |
2df46246 | 1877 | int nb_sectors, QEMUIOVector *qiov) |
33b1db1c MK |
1878 | { |
1879 | SheepdogAIOCB *acb; | |
2df46246 | 1880 | int ret; |
33b1db1c MK |
1881 | |
1882 | if (bs->growable && sector_num + nb_sectors > bs->total_sectors) { | |
e8bfaa2f | 1883 | ret = sd_truncate(bs, (sector_num + nb_sectors) * BDRV_SECTOR_SIZE); |
cb595887 MK |
1884 | if (ret < 0) { |
1885 | return ret; | |
33b1db1c MK |
1886 | } |
1887 | bs->total_sectors = sector_num + nb_sectors; | |
1888 | } | |
1889 | ||
f700f8e3 | 1890 | acb = sd_aio_setup(bs, qiov, sector_num, nb_sectors); |
33b1db1c MK |
1891 | acb->aio_done_func = sd_write_done; |
1892 | acb->aiocb_type = AIOCB_WRITE_UDATA; | |
1893 | ||
2df46246 MK |
1894 | ret = sd_co_rw_vector(acb); |
1895 | if (ret <= 0) { | |
1896 | qemu_aio_release(acb); | |
1897 | return ret; | |
1898 | } | |
1899 | ||
1900 | qemu_coroutine_yield(); | |
1901 | ||
1902 | return acb->ret; | |
33b1db1c MK |
1903 | } |
1904 | ||
a968168c | 1905 | static coroutine_fn int sd_co_readv(BlockDriverState *bs, int64_t sector_num, |
2df46246 | 1906 | int nb_sectors, QEMUIOVector *qiov) |
33b1db1c MK |
1907 | { |
1908 | SheepdogAIOCB *acb; | |
19db9b90 | 1909 | int ret; |
33b1db1c | 1910 | |
f700f8e3 | 1911 | acb = sd_aio_setup(bs, qiov, sector_num, nb_sectors); |
33b1db1c MK |
1912 | acb->aiocb_type = AIOCB_READ_UDATA; |
1913 | acb->aio_done_func = sd_finish_aiocb; | |
1914 | ||
2df46246 MK |
1915 | ret = sd_co_rw_vector(acb); |
1916 | if (ret <= 0) { | |
1917 | qemu_aio_release(acb); | |
1918 | return ret; | |
1919 | } | |
1920 | ||
1921 | qemu_coroutine_yield(); | |
1922 | ||
1923 | return acb->ret; | |
33b1db1c MK |
1924 | } |
1925 | ||
47622c44 LY |
1926 | static int coroutine_fn sd_co_flush_to_disk(BlockDriverState *bs) |
1927 | { | |
1928 | BDRVSheepdogState *s = bs->opaque; | |
47783072 LY |
1929 | SheepdogAIOCB *acb; |
1930 | AIOReq *aio_req; | |
47622c44 | 1931 | int ret; |
47622c44 | 1932 | |
0e7106d8 | 1933 | if (s->cache_flags != SD_FLAG_CMD_CACHE) { |
47622c44 LY |
1934 | return 0; |
1935 | } | |
1936 | ||
f700f8e3 | 1937 | acb = sd_aio_setup(bs, NULL, 0, 0); |
47783072 LY |
1938 | acb->aiocb_type = AIOCB_FLUSH_CACHE; |
1939 | acb->aio_done_func = sd_finish_aiocb; | |
47622c44 | 1940 | |
47783072 LY |
1941 | aio_req = alloc_aio_req(s, acb, vid_to_vdi_oid(s->inode.vdi_id), |
1942 | 0, 0, 0, 0, 0); | |
1943 | QLIST_INSERT_HEAD(&s->inflight_aio_head, aio_req, aio_siblings); | |
1944 | ret = add_aio_request(s, aio_req, NULL, 0, false, acb->aiocb_type); | |
1945 | if (ret < 0) { | |
1946 | error_report("add_aio_request is failed"); | |
1947 | free_aio_req(s, aio_req); | |
1948 | qemu_aio_release(acb); | |
47622c44 LY |
1949 | return ret; |
1950 | } | |
1951 | ||
47783072 LY |
1952 | qemu_coroutine_yield(); |
1953 | return acb->ret; | |
47622c44 LY |
1954 | } |
1955 | ||
33b1db1c MK |
1956 | static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info) |
1957 | { | |
1958 | BDRVSheepdogState *s = bs->opaque; | |
1959 | int ret, fd; | |
1960 | uint32_t new_vid; | |
1961 | SheepdogInode *inode; | |
1962 | unsigned int datalen; | |
1963 | ||
2440a2c3 | 1964 | DPRINTF("sn_info: name %s id_str %s s: name %s vm_state_size %" PRId64 " " |
33b1db1c MK |
1965 | "is_snapshot %d\n", sn_info->name, sn_info->id_str, |
1966 | s->name, sn_info->vm_state_size, s->is_snapshot); | |
1967 | ||
1968 | if (s->is_snapshot) { | |
1969 | error_report("You can't create a snapshot of a snapshot VDI, " | |
6daf194d | 1970 | "%s (%" PRIu32 ").", s->name, s->inode.vdi_id); |
33b1db1c MK |
1971 | |
1972 | return -EINVAL; | |
1973 | } | |
1974 | ||
2440a2c3 | 1975 | DPRINTF("%s %s\n", sn_info->name, sn_info->id_str); |
33b1db1c MK |
1976 | |
1977 | s->inode.vm_state_size = sn_info->vm_state_size; | |
1978 | s->inode.vm_clock_nsec = sn_info->vm_clock_nsec; | |
3178e275 JM |
1979 | /* It appears that inode.tag does not require a NUL terminator, |
1980 | * which means this use of strncpy is ok. | |
1981 | */ | |
33b1db1c MK |
1982 | strncpy(s->inode.tag, sn_info->name, sizeof(s->inode.tag)); |
1983 | /* we don't need to update entire object */ | |
1984 | datalen = SD_INODE_SIZE - sizeof(s->inode.data_vdi_id); | |
1985 | ||
1986 | /* refresh inode. */ | |
25af257d | 1987 | fd = connect_to_sdog(s); |
33b1db1c | 1988 | if (fd < 0) { |
cb595887 | 1989 | ret = fd; |
33b1db1c MK |
1990 | goto cleanup; |
1991 | } | |
1992 | ||
1993 | ret = write_object(fd, (char *)&s->inode, vid_to_vdi_oid(s->inode.vdi_id), | |
0e7106d8 | 1994 | s->inode.nr_copies, datalen, 0, false, s->cache_flags); |
33b1db1c | 1995 | if (ret < 0) { |
6daf194d | 1996 | error_report("failed to write snapshot's inode."); |
33b1db1c MK |
1997 | goto cleanup; |
1998 | } | |
1999 | ||
25af257d MK |
2000 | ret = do_sd_create(s, s->name, s->inode.vdi_size, s->inode.vdi_id, &new_vid, |
2001 | 1); | |
33b1db1c | 2002 | if (ret < 0) { |
6daf194d | 2003 | error_report("failed to create inode for snapshot. %s", |
33b1db1c | 2004 | strerror(errno)); |
33b1db1c MK |
2005 | goto cleanup; |
2006 | } | |
2007 | ||
7267c094 | 2008 | inode = (SheepdogInode *)g_malloc(datalen); |
33b1db1c MK |
2009 | |
2010 | ret = read_object(fd, (char *)inode, vid_to_vdi_oid(new_vid), | |
0e7106d8 | 2011 | s->inode.nr_copies, datalen, 0, s->cache_flags); |
33b1db1c MK |
2012 | |
2013 | if (ret < 0) { | |
6daf194d | 2014 | error_report("failed to read new inode info. %s", strerror(errno)); |
33b1db1c MK |
2015 | goto cleanup; |
2016 | } | |
2017 | ||
2018 | memcpy(&s->inode, inode, datalen); | |
2440a2c3 | 2019 | DPRINTF("s->inode: name %s snap_id %x oid %x\n", |
33b1db1c MK |
2020 | s->inode.name, s->inode.snap_id, s->inode.vdi_id); |
2021 | ||
2022 | cleanup: | |
2023 | closesocket(fd); | |
2024 | return ret; | |
2025 | } | |
2026 | ||
859e5553 LY |
2027 | /* |
2028 | * We implement rollback(loadvm) operation to the specified snapshot by | |
2029 | * 1) switch to the snapshot | |
2030 | * 2) rely on sd_create_branch to delete working VDI and | |
2031 | * 3) create a new working VDI based on the speicified snapshot | |
2032 | */ | |
33b1db1c MK |
2033 | static int sd_snapshot_goto(BlockDriverState *bs, const char *snapshot_id) |
2034 | { | |
2035 | BDRVSheepdogState *s = bs->opaque; | |
2036 | BDRVSheepdogState *old_s; | |
9ff53a0e | 2037 | char tag[SD_MAX_VDI_TAG_LEN]; |
33b1db1c | 2038 | uint32_t snapid = 0; |
9ff53a0e | 2039 | int ret = 0; |
33b1db1c | 2040 | |
7267c094 | 2041 | old_s = g_malloc(sizeof(BDRVSheepdogState)); |
33b1db1c MK |
2042 | |
2043 | memcpy(old_s, s, sizeof(BDRVSheepdogState)); | |
2044 | ||
33b1db1c | 2045 | snapid = strtoul(snapshot_id, NULL, 10); |
3178e275 JM |
2046 | if (snapid) { |
2047 | tag[0] = 0; | |
2048 | } else { | |
b579ffb3 | 2049 | pstrcpy(tag, sizeof(tag), snapshot_id); |
33b1db1c MK |
2050 | } |
2051 | ||
9ff53a0e | 2052 | ret = reload_inode(s, snapid, tag); |
33b1db1c | 2053 | if (ret) { |
33b1db1c MK |
2054 | goto out; |
2055 | } | |
2056 | ||
cede621f LY |
2057 | ret = sd_create_branch(s); |
2058 | if (ret) { | |
33b1db1c MK |
2059 | goto out; |
2060 | } | |
2061 | ||
7267c094 | 2062 | g_free(old_s); |
33b1db1c MK |
2063 | |
2064 | return 0; | |
2065 | out: | |
2066 | /* recover bdrv_sd_state */ | |
2067 | memcpy(s, old_s, sizeof(BDRVSheepdogState)); | |
7267c094 | 2068 | g_free(old_s); |
33b1db1c | 2069 | |
6daf194d | 2070 | error_report("failed to open. recover old bdrv_sd_state."); |
33b1db1c MK |
2071 | |
2072 | return ret; | |
2073 | } | |
2074 | ||
2075 | static int sd_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
2076 | { | |
2077 | /* FIXME: Delete specified snapshot id. */ | |
2078 | return 0; | |
2079 | } | |
2080 | ||
33b1db1c MK |
2081 | static int sd_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab) |
2082 | { | |
2083 | BDRVSheepdogState *s = bs->opaque; | |
2084 | SheepdogReq req; | |
2085 | int fd, nr = 1024, ret, max = BITS_TO_LONGS(SD_NR_VDIS) * sizeof(long); | |
2086 | QEMUSnapshotInfo *sn_tab = NULL; | |
2087 | unsigned wlen, rlen; | |
2088 | int found = 0; | |
2089 | static SheepdogInode inode; | |
2090 | unsigned long *vdi_inuse; | |
2091 | unsigned int start_nr; | |
2092 | uint64_t hval; | |
2093 | uint32_t vid; | |
2094 | ||
7267c094 | 2095 | vdi_inuse = g_malloc(max); |
33b1db1c | 2096 | |
25af257d | 2097 | fd = connect_to_sdog(s); |
33b1db1c | 2098 | if (fd < 0) { |
cb595887 | 2099 | ret = fd; |
33b1db1c MK |
2100 | goto out; |
2101 | } | |
2102 | ||
2103 | rlen = max; | |
2104 | wlen = 0; | |
2105 | ||
2106 | memset(&req, 0, sizeof(req)); | |
2107 | ||
2108 | req.opcode = SD_OP_READ_VDIS; | |
2109 | req.data_length = max; | |
2110 | ||
2111 | ret = do_req(fd, (SheepdogReq *)&req, vdi_inuse, &wlen, &rlen); | |
2112 | ||
2113 | closesocket(fd); | |
2114 | if (ret) { | |
2115 | goto out; | |
2116 | } | |
2117 | ||
7267c094 | 2118 | sn_tab = g_malloc0(nr * sizeof(*sn_tab)); |
33b1db1c MK |
2119 | |
2120 | /* calculate a vdi id with hash function */ | |
2121 | hval = fnv_64a_buf(s->name, strlen(s->name), FNV1A_64_INIT); | |
2122 | start_nr = hval & (SD_NR_VDIS - 1); | |
2123 | ||
25af257d | 2124 | fd = connect_to_sdog(s); |
33b1db1c | 2125 | if (fd < 0) { |
cb595887 | 2126 | ret = fd; |
33b1db1c MK |
2127 | goto out; |
2128 | } | |
2129 | ||
2130 | for (vid = start_nr; found < nr; vid = (vid + 1) % SD_NR_VDIS) { | |
2131 | if (!test_bit(vid, vdi_inuse)) { | |
2132 | break; | |
2133 | } | |
2134 | ||
2135 | /* we don't need to read entire object */ | |
2136 | ret = read_object(fd, (char *)&inode, vid_to_vdi_oid(vid), | |
47622c44 | 2137 | 0, SD_INODE_SIZE - sizeof(inode.data_vdi_id), 0, |
0e7106d8 | 2138 | s->cache_flags); |
33b1db1c MK |
2139 | |
2140 | if (ret) { | |
2141 | continue; | |
2142 | } | |
2143 | ||
2144 | if (!strcmp(inode.name, s->name) && is_snapshot(&inode)) { | |
2145 | sn_tab[found].date_sec = inode.snap_ctime >> 32; | |
2146 | sn_tab[found].date_nsec = inode.snap_ctime & 0xffffffff; | |
2147 | sn_tab[found].vm_state_size = inode.vm_state_size; | |
2148 | sn_tab[found].vm_clock_nsec = inode.vm_clock_nsec; | |
2149 | ||
2150 | snprintf(sn_tab[found].id_str, sizeof(sn_tab[found].id_str), "%u", | |
2151 | inode.snap_id); | |
3178e275 JM |
2152 | pstrcpy(sn_tab[found].name, |
2153 | MIN(sizeof(sn_tab[found].name), sizeof(inode.tag)), | |
2154 | inode.tag); | |
33b1db1c MK |
2155 | found++; |
2156 | } | |
2157 | } | |
2158 | ||
2159 | closesocket(fd); | |
2160 | out: | |
2161 | *psn_tab = sn_tab; | |
2162 | ||
7267c094 | 2163 | g_free(vdi_inuse); |
33b1db1c | 2164 | |
cb595887 MK |
2165 | if (ret < 0) { |
2166 | return ret; | |
2167 | } | |
2168 | ||
33b1db1c MK |
2169 | return found; |
2170 | } | |
2171 | ||
2172 | static int do_load_save_vmstate(BDRVSheepdogState *s, uint8_t *data, | |
2173 | int64_t pos, int size, int load) | |
2174 | { | |
2f536801 MK |
2175 | bool create; |
2176 | int fd, ret = 0, remaining = size; | |
33b1db1c MK |
2177 | unsigned int data_len; |
2178 | uint64_t vmstate_oid; | |
33b1db1c | 2179 | uint64_t offset; |
cede621f LY |
2180 | uint32_t vdi_index; |
2181 | uint32_t vdi_id = load ? s->inode.parent_vdi_id : s->inode.vdi_id; | |
33b1db1c | 2182 | |
25af257d | 2183 | fd = connect_to_sdog(s); |
33b1db1c | 2184 | if (fd < 0) { |
cb595887 | 2185 | return fd; |
33b1db1c MK |
2186 | } |
2187 | ||
6f3c714e | 2188 | while (remaining) { |
33b1db1c MK |
2189 | vdi_index = pos / SD_DATA_OBJ_SIZE; |
2190 | offset = pos % SD_DATA_OBJ_SIZE; | |
2191 | ||
1f7a48de | 2192 | data_len = MIN(remaining, SD_DATA_OBJ_SIZE - offset); |
33b1db1c | 2193 | |
cede621f | 2194 | vmstate_oid = vid_to_vmstate_oid(vdi_id, vdi_index); |
33b1db1c MK |
2195 | |
2196 | create = (offset == 0); | |
2197 | if (load) { | |
2198 | ret = read_object(fd, (char *)data, vmstate_oid, | |
47622c44 | 2199 | s->inode.nr_copies, data_len, offset, |
0e7106d8 | 2200 | s->cache_flags); |
33b1db1c MK |
2201 | } else { |
2202 | ret = write_object(fd, (char *)data, vmstate_oid, | |
47622c44 | 2203 | s->inode.nr_copies, data_len, offset, create, |
0e7106d8 | 2204 | s->cache_flags); |
33b1db1c MK |
2205 | } |
2206 | ||
2207 | if (ret < 0) { | |
6daf194d | 2208 | error_report("failed to save vmstate %s", strerror(errno)); |
33b1db1c MK |
2209 | goto cleanup; |
2210 | } | |
2211 | ||
2212 | pos += data_len; | |
1f7a48de | 2213 | data += data_len; |
6f3c714e | 2214 | remaining -= data_len; |
33b1db1c | 2215 | } |
6f3c714e | 2216 | ret = size; |
33b1db1c MK |
2217 | cleanup: |
2218 | closesocket(fd); | |
2219 | return ret; | |
2220 | } | |
2221 | ||
cf8074b3 KW |
2222 | static int sd_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, |
2223 | int64_t pos) | |
33b1db1c MK |
2224 | { |
2225 | BDRVSheepdogState *s = bs->opaque; | |
cf8074b3 KW |
2226 | void *buf; |
2227 | int ret; | |
33b1db1c | 2228 | |
cf8074b3 KW |
2229 | buf = qemu_blockalign(bs, qiov->size); |
2230 | qemu_iovec_to_buf(qiov, 0, buf, qiov->size); | |
2231 | ret = do_load_save_vmstate(s, (uint8_t *) buf, pos, qiov->size, 0); | |
2232 | qemu_vfree(buf); | |
2233 | ||
2234 | return ret; | |
33b1db1c MK |
2235 | } |
2236 | ||
2237 | static int sd_load_vmstate(BlockDriverState *bs, uint8_t *data, | |
2238 | int64_t pos, int size) | |
2239 | { | |
2240 | BDRVSheepdogState *s = bs->opaque; | |
2241 | ||
2242 | return do_load_save_vmstate(s, data, pos, size, 1); | |
2243 | } | |
2244 | ||
2245 | ||
cac8f4a6 LY |
2246 | static coroutine_fn int sd_co_discard(BlockDriverState *bs, int64_t sector_num, |
2247 | int nb_sectors) | |
2248 | { | |
2249 | SheepdogAIOCB *acb; | |
2250 | QEMUIOVector dummy; | |
2251 | BDRVSheepdogState *s = bs->opaque; | |
2252 | int ret; | |
2253 | ||
2254 | if (!s->discard_supported) { | |
2255 | return 0; | |
2256 | } | |
2257 | ||
2258 | acb = sd_aio_setup(bs, &dummy, sector_num, nb_sectors); | |
2259 | acb->aiocb_type = AIOCB_DISCARD_OBJ; | |
2260 | acb->aio_done_func = sd_finish_aiocb; | |
2261 | ||
2262 | ret = sd_co_rw_vector(acb); | |
2263 | if (ret <= 0) { | |
2264 | qemu_aio_release(acb); | |
2265 | return ret; | |
2266 | } | |
2267 | ||
2268 | qemu_coroutine_yield(); | |
2269 | ||
2270 | return acb->ret; | |
2271 | } | |
2272 | ||
8d71c631 LY |
2273 | static coroutine_fn int |
2274 | sd_co_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
2275 | int *pnum) | |
2276 | { | |
2277 | BDRVSheepdogState *s = bs->opaque; | |
2278 | SheepdogInode *inode = &s->inode; | |
2279 | unsigned long start = sector_num * BDRV_SECTOR_SIZE / SD_DATA_OBJ_SIZE, | |
2280 | end = DIV_ROUND_UP((sector_num + nb_sectors) * | |
2281 | BDRV_SECTOR_SIZE, SD_DATA_OBJ_SIZE); | |
2282 | unsigned long idx; | |
2283 | int ret = 1; | |
2284 | ||
2285 | for (idx = start; idx < end; idx++) { | |
2286 | if (inode->data_vdi_id[idx] == 0) { | |
2287 | break; | |
2288 | } | |
2289 | } | |
2290 | if (idx == start) { | |
2291 | /* Get the longest length of unallocated sectors */ | |
2292 | ret = 0; | |
2293 | for (idx = start + 1; idx < end; idx++) { | |
2294 | if (inode->data_vdi_id[idx] != 0) { | |
2295 | break; | |
2296 | } | |
2297 | } | |
2298 | } | |
2299 | ||
2300 | *pnum = (idx - start) * SD_DATA_OBJ_SIZE / BDRV_SECTOR_SIZE; | |
2301 | if (*pnum > nb_sectors) { | |
2302 | *pnum = nb_sectors; | |
2303 | } | |
2304 | return ret; | |
2305 | } | |
2306 | ||
33b1db1c MK |
2307 | static QEMUOptionParameter sd_create_options[] = { |
2308 | { | |
2309 | .name = BLOCK_OPT_SIZE, | |
2310 | .type = OPT_SIZE, | |
2311 | .help = "Virtual disk size" | |
2312 | }, | |
2313 | { | |
2314 | .name = BLOCK_OPT_BACKING_FILE, | |
2315 | .type = OPT_STRING, | |
2316 | .help = "File name of a base image" | |
2317 | }, | |
a8e0fdd7 MK |
2318 | { |
2319 | .name = BLOCK_OPT_PREALLOC, | |
2320 | .type = OPT_STRING, | |
2321 | .help = "Preallocation mode (allowed values: off, full)" | |
2322 | }, | |
33b1db1c MK |
2323 | { NULL } |
2324 | }; | |
2325 | ||
5d6768e3 | 2326 | static BlockDriver bdrv_sheepdog = { |
33b1db1c MK |
2327 | .format_name = "sheepdog", |
2328 | .protocol_name = "sheepdog", | |
2329 | .instance_size = sizeof(BDRVSheepdogState), | |
2330 | .bdrv_file_open = sd_open, | |
2331 | .bdrv_close = sd_close, | |
2332 | .bdrv_create = sd_create, | |
e4f5c1bf | 2333 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
33b1db1c MK |
2334 | .bdrv_getlength = sd_getlength, |
2335 | .bdrv_truncate = sd_truncate, | |
2336 | ||
2df46246 MK |
2337 | .bdrv_co_readv = sd_co_readv, |
2338 | .bdrv_co_writev = sd_co_writev, | |
47622c44 | 2339 | .bdrv_co_flush_to_disk = sd_co_flush_to_disk, |
cac8f4a6 | 2340 | .bdrv_co_discard = sd_co_discard, |
8d71c631 | 2341 | .bdrv_co_is_allocated = sd_co_is_allocated, |
33b1db1c MK |
2342 | |
2343 | .bdrv_snapshot_create = sd_snapshot_create, | |
2344 | .bdrv_snapshot_goto = sd_snapshot_goto, | |
2345 | .bdrv_snapshot_delete = sd_snapshot_delete, | |
2346 | .bdrv_snapshot_list = sd_snapshot_list, | |
2347 | ||
2348 | .bdrv_save_vmstate = sd_save_vmstate, | |
2349 | .bdrv_load_vmstate = sd_load_vmstate, | |
2350 | ||
2351 | .create_options = sd_create_options, | |
2352 | }; | |
2353 | ||
5d6768e3 MK |
2354 | static BlockDriver bdrv_sheepdog_tcp = { |
2355 | .format_name = "sheepdog", | |
2356 | .protocol_name = "sheepdog+tcp", | |
2357 | .instance_size = sizeof(BDRVSheepdogState), | |
2358 | .bdrv_file_open = sd_open, | |
2359 | .bdrv_close = sd_close, | |
2360 | .bdrv_create = sd_create, | |
e4f5c1bf | 2361 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
5d6768e3 MK |
2362 | .bdrv_getlength = sd_getlength, |
2363 | .bdrv_truncate = sd_truncate, | |
2364 | ||
2365 | .bdrv_co_readv = sd_co_readv, | |
2366 | .bdrv_co_writev = sd_co_writev, | |
2367 | .bdrv_co_flush_to_disk = sd_co_flush_to_disk, | |
cac8f4a6 | 2368 | .bdrv_co_discard = sd_co_discard, |
8d71c631 | 2369 | .bdrv_co_is_allocated = sd_co_is_allocated, |
5d6768e3 MK |
2370 | |
2371 | .bdrv_snapshot_create = sd_snapshot_create, | |
2372 | .bdrv_snapshot_goto = sd_snapshot_goto, | |
2373 | .bdrv_snapshot_delete = sd_snapshot_delete, | |
2374 | .bdrv_snapshot_list = sd_snapshot_list, | |
2375 | ||
2376 | .bdrv_save_vmstate = sd_save_vmstate, | |
2377 | .bdrv_load_vmstate = sd_load_vmstate, | |
2378 | ||
2379 | .create_options = sd_create_options, | |
2380 | }; | |
2381 | ||
1b8bbb46 MK |
2382 | static BlockDriver bdrv_sheepdog_unix = { |
2383 | .format_name = "sheepdog", | |
2384 | .protocol_name = "sheepdog+unix", | |
2385 | .instance_size = sizeof(BDRVSheepdogState), | |
2386 | .bdrv_file_open = sd_open, | |
2387 | .bdrv_close = sd_close, | |
2388 | .bdrv_create = sd_create, | |
3ac21627 | 2389 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
1b8bbb46 MK |
2390 | .bdrv_getlength = sd_getlength, |
2391 | .bdrv_truncate = sd_truncate, | |
2392 | ||
2393 | .bdrv_co_readv = sd_co_readv, | |
2394 | .bdrv_co_writev = sd_co_writev, | |
2395 | .bdrv_co_flush_to_disk = sd_co_flush_to_disk, | |
cac8f4a6 | 2396 | .bdrv_co_discard = sd_co_discard, |
8d71c631 | 2397 | .bdrv_co_is_allocated = sd_co_is_allocated, |
1b8bbb46 MK |
2398 | |
2399 | .bdrv_snapshot_create = sd_snapshot_create, | |
2400 | .bdrv_snapshot_goto = sd_snapshot_goto, | |
2401 | .bdrv_snapshot_delete = sd_snapshot_delete, | |
2402 | .bdrv_snapshot_list = sd_snapshot_list, | |
2403 | ||
2404 | .bdrv_save_vmstate = sd_save_vmstate, | |
2405 | .bdrv_load_vmstate = sd_load_vmstate, | |
2406 | ||
2407 | .create_options = sd_create_options, | |
2408 | }; | |
2409 | ||
33b1db1c MK |
2410 | static void bdrv_sheepdog_init(void) |
2411 | { | |
2412 | bdrv_register(&bdrv_sheepdog); | |
5d6768e3 | 2413 | bdrv_register(&bdrv_sheepdog_tcp); |
1b8bbb46 | 2414 | bdrv_register(&bdrv_sheepdog_unix); |
33b1db1c MK |
2415 | } |
2416 | block_init(bdrv_sheepdog_init); |