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Commit | Line | Data |
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6542aa9c PL |
1 | /* |
2 | * QEMU Block driver for native access to files on NFS shares | |
3 | * | |
38f8d5e0 | 4 | * Copyright (c) 2014-2016 Peter Lieven <pl@kamp.de> |
6542aa9c PL |
5 | * |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | ||
80c71a24 | 25 | #include "qemu/osdep.h" |
6542aa9c PL |
26 | |
27 | #include <poll.h> | |
28 | #include "qemu-common.h" | |
29 | #include "qemu/config-file.h" | |
30 | #include "qemu/error-report.h" | |
d165b8cb | 31 | #include "qapi/error.h" |
6542aa9c PL |
32 | #include "block/block_int.h" |
33 | #include "trace.h" | |
34 | #include "qemu/iov.h" | |
35 | #include "qemu/uri.h" | |
0d94b746 | 36 | #include "qemu/cutils.h" |
6542aa9c | 37 | #include "sysemu/sysemu.h" |
94d6a7a7 AA |
38 | #include "qapi/qmp/qdict.h" |
39 | #include "qapi/qmp/qint.h" | |
40 | #include "qapi/qmp/qstring.h" | |
41 | #include "qapi-visit.h" | |
42 | #include "qapi/qobject-input-visitor.h" | |
43 | #include "qapi/qobject-output-visitor.h" | |
6542aa9c PL |
44 | #include <nfsc/libnfs.h> |
45 | ||
94d6a7a7 | 46 | |
29c838cd | 47 | #define QEMU_NFS_MAX_READAHEAD_SIZE 1048576 |
d99b26c4 | 48 | #define QEMU_NFS_MAX_PAGECACHE_SIZE (8388608 / NFS_BLKSIZE) |
7725b8bf | 49 | #define QEMU_NFS_MAX_DEBUG_LEVEL 2 |
29c838cd | 50 | |
6542aa9c PL |
51 | typedef struct NFSClient { |
52 | struct nfs_context *context; | |
53 | struct nfsfh *fh; | |
54 | int events; | |
55 | bool has_zero_init; | |
471799d1 | 56 | AioContext *aio_context; |
18a8056e | 57 | blkcnt_t st_blocks; |
38f8d5e0 | 58 | bool cache_used; |
94d6a7a7 AA |
59 | NFSServer *server; |
60 | char *path; | |
61 | int64_t uid, gid, tcp_syncnt, readahead, pagecache, debug; | |
6542aa9c PL |
62 | } NFSClient; |
63 | ||
64 | typedef struct NFSRPC { | |
d746427a | 65 | BlockDriverState *bs; |
6542aa9c PL |
66 | int ret; |
67 | int complete; | |
68 | QEMUIOVector *iov; | |
69 | struct stat *st; | |
70 | Coroutine *co; | |
471799d1 | 71 | NFSClient *client; |
6542aa9c PL |
72 | } NFSRPC; |
73 | ||
94d6a7a7 AA |
74 | static int nfs_parse_uri(const char *filename, QDict *options, Error **errp) |
75 | { | |
76 | URI *uri = NULL; | |
77 | QueryParams *qp = NULL; | |
78 | int ret = -EINVAL, i; | |
79 | ||
80 | uri = uri_parse(filename); | |
81 | if (!uri) { | |
82 | error_setg(errp, "Invalid URI specified"); | |
83 | goto out; | |
84 | } | |
85 | if (strcmp(uri->scheme, "nfs") != 0) { | |
86 | error_setg(errp, "URI scheme must be 'nfs'"); | |
87 | goto out; | |
88 | } | |
89 | ||
90 | if (!uri->server) { | |
91 | error_setg(errp, "missing hostname in URI"); | |
92 | goto out; | |
93 | } | |
94 | ||
95 | if (!uri->path) { | |
96 | error_setg(errp, "missing file path in URI"); | |
97 | goto out; | |
98 | } | |
99 | ||
100 | qp = query_params_parse(uri->query); | |
101 | if (!qp) { | |
102 | error_setg(errp, "could not parse query parameters"); | |
103 | goto out; | |
104 | } | |
105 | ||
106 | qdict_put(options, "server.host", qstring_from_str(uri->server)); | |
107 | qdict_put(options, "server.type", qstring_from_str("inet")); | |
108 | qdict_put(options, "path", qstring_from_str(uri->path)); | |
109 | ||
110 | for (i = 0; i < qp->n; i++) { | |
8d20abe8 | 111 | unsigned long long val; |
94d6a7a7 AA |
112 | if (!qp->p[i].value) { |
113 | error_setg(errp, "Value for NFS parameter expected: %s", | |
114 | qp->p[i].name); | |
115 | goto out; | |
116 | } | |
8d20abe8 | 117 | if (parse_uint_full(qp->p[i].value, &val, 0)) { |
94d6a7a7 AA |
118 | error_setg(errp, "Illegal value for NFS parameter: %s", |
119 | qp->p[i].name); | |
120 | goto out; | |
121 | } | |
122 | if (!strcmp(qp->p[i].name, "uid")) { | |
123 | qdict_put(options, "user", | |
124 | qstring_from_str(qp->p[i].value)); | |
125 | } else if (!strcmp(qp->p[i].name, "gid")) { | |
126 | qdict_put(options, "group", | |
127 | qstring_from_str(qp->p[i].value)); | |
128 | } else if (!strcmp(qp->p[i].name, "tcp-syncnt")) { | |
129 | qdict_put(options, "tcp-syn-count", | |
130 | qstring_from_str(qp->p[i].value)); | |
131 | } else if (!strcmp(qp->p[i].name, "readahead")) { | |
132 | qdict_put(options, "readahead-size", | |
133 | qstring_from_str(qp->p[i].value)); | |
134 | } else if (!strcmp(qp->p[i].name, "pagecache")) { | |
135 | qdict_put(options, "page-cache-size", | |
136 | qstring_from_str(qp->p[i].value)); | |
137 | } else if (!strcmp(qp->p[i].name, "debug")) { | |
7103d916 | 138 | qdict_put(options, "debug", |
94d6a7a7 AA |
139 | qstring_from_str(qp->p[i].value)); |
140 | } else { | |
141 | error_setg(errp, "Unknown NFS parameter name: %s", | |
142 | qp->p[i].name); | |
143 | goto out; | |
144 | } | |
145 | } | |
146 | ret = 0; | |
147 | out: | |
148 | if (qp) { | |
149 | query_params_free(qp); | |
150 | } | |
151 | if (uri) { | |
152 | uri_free(uri); | |
153 | } | |
154 | return ret; | |
155 | } | |
156 | ||
157 | static bool nfs_has_filename_options_conflict(QDict *options, Error **errp) | |
158 | { | |
159 | const QDictEntry *qe; | |
160 | ||
161 | for (qe = qdict_first(options); qe; qe = qdict_next(options, qe)) { | |
162 | if (!strcmp(qe->key, "host") || | |
163 | !strcmp(qe->key, "path") || | |
164 | !strcmp(qe->key, "user") || | |
165 | !strcmp(qe->key, "group") || | |
166 | !strcmp(qe->key, "tcp-syn-count") || | |
167 | !strcmp(qe->key, "readahead-size") || | |
168 | !strcmp(qe->key, "page-cache-size") || | |
7103d916 | 169 | !strcmp(qe->key, "debug") || |
94d6a7a7 AA |
170 | strstart(qe->key, "server.", NULL)) |
171 | { | |
172 | error_setg(errp, "Option %s cannot be used with a filename", | |
173 | qe->key); | |
174 | return true; | |
175 | } | |
176 | } | |
177 | ||
178 | return false; | |
179 | } | |
180 | ||
181 | static void nfs_parse_filename(const char *filename, QDict *options, | |
182 | Error **errp) | |
183 | { | |
184 | if (nfs_has_filename_options_conflict(options, errp)) { | |
185 | return; | |
186 | } | |
187 | ||
188 | nfs_parse_uri(filename, options, errp); | |
189 | } | |
190 | ||
6542aa9c PL |
191 | static void nfs_process_read(void *arg); |
192 | static void nfs_process_write(void *arg); | |
193 | ||
194 | static void nfs_set_events(NFSClient *client) | |
195 | { | |
196 | int ev = nfs_which_events(client->context); | |
197 | if (ev != client->events) { | |
dca21ef2 FZ |
198 | aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context), |
199 | false, | |
471799d1 | 200 | (ev & POLLIN) ? nfs_process_read : NULL, |
f6a51c84 SH |
201 | (ev & POLLOUT) ? nfs_process_write : NULL, |
202 | NULL, client); | |
6542aa9c PL |
203 | |
204 | } | |
205 | client->events = ev; | |
206 | } | |
207 | ||
208 | static void nfs_process_read(void *arg) | |
209 | { | |
210 | NFSClient *client = arg; | |
9d456654 PB |
211 | |
212 | aio_context_acquire(client->aio_context); | |
6542aa9c PL |
213 | nfs_service(client->context, POLLIN); |
214 | nfs_set_events(client); | |
9d456654 | 215 | aio_context_release(client->aio_context); |
6542aa9c PL |
216 | } |
217 | ||
218 | static void nfs_process_write(void *arg) | |
219 | { | |
220 | NFSClient *client = arg; | |
9d456654 PB |
221 | |
222 | aio_context_acquire(client->aio_context); | |
6542aa9c PL |
223 | nfs_service(client->context, POLLOUT); |
224 | nfs_set_events(client); | |
9d456654 | 225 | aio_context_release(client->aio_context); |
6542aa9c PL |
226 | } |
227 | ||
d746427a | 228 | static void nfs_co_init_task(BlockDriverState *bs, NFSRPC *task) |
6542aa9c PL |
229 | { |
230 | *task = (NFSRPC) { | |
471799d1 | 231 | .co = qemu_coroutine_self(), |
d746427a PB |
232 | .bs = bs, |
233 | .client = bs->opaque, | |
6542aa9c PL |
234 | }; |
235 | } | |
236 | ||
237 | static void nfs_co_generic_bh_cb(void *opaque) | |
238 | { | |
239 | NFSRPC *task = opaque; | |
1919631e | 240 | |
a2c0fe2f | 241 | task->complete = 1; |
1919631e | 242 | aio_co_wake(task->co); |
6542aa9c PL |
243 | } |
244 | ||
245 | static void | |
246 | nfs_co_generic_cb(int ret, struct nfs_context *nfs, void *data, | |
247 | void *private_data) | |
248 | { | |
249 | NFSRPC *task = private_data; | |
6542aa9c | 250 | task->ret = ret; |
d746427a | 251 | assert(!task->st); |
6542aa9c PL |
252 | if (task->ret > 0 && task->iov) { |
253 | if (task->ret <= task->iov->size) { | |
254 | qemu_iovec_from_buf(task->iov, 0, data, task->ret); | |
255 | } else { | |
256 | task->ret = -EIO; | |
257 | } | |
258 | } | |
20fccb18 PL |
259 | if (task->ret < 0) { |
260 | error_report("NFS Error: %s", nfs_get_error(nfs)); | |
261 | } | |
d746427a PB |
262 | aio_bh_schedule_oneshot(task->client->aio_context, |
263 | nfs_co_generic_bh_cb, task); | |
6542aa9c PL |
264 | } |
265 | ||
69785a22 PL |
266 | static int coroutine_fn nfs_co_preadv(BlockDriverState *bs, uint64_t offset, |
267 | uint64_t bytes, QEMUIOVector *iov, | |
268 | int flags) | |
6542aa9c PL |
269 | { |
270 | NFSClient *client = bs->opaque; | |
271 | NFSRPC task; | |
272 | ||
d746427a | 273 | nfs_co_init_task(bs, &task); |
6542aa9c PL |
274 | task.iov = iov; |
275 | ||
276 | if (nfs_pread_async(client->context, client->fh, | |
69785a22 | 277 | offset, bytes, nfs_co_generic_cb, &task) != 0) { |
6542aa9c PL |
278 | return -ENOMEM; |
279 | } | |
280 | ||
aa92d6c4 | 281 | nfs_set_events(client); |
6542aa9c | 282 | while (!task.complete) { |
6542aa9c PL |
283 | qemu_coroutine_yield(); |
284 | } | |
285 | ||
286 | if (task.ret < 0) { | |
287 | return task.ret; | |
288 | } | |
289 | ||
290 | /* zero pad short reads */ | |
291 | if (task.ret < iov->size) { | |
292 | qemu_iovec_memset(iov, task.ret, 0, iov->size - task.ret); | |
293 | } | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
69785a22 PL |
298 | static int coroutine_fn nfs_co_pwritev(BlockDriverState *bs, uint64_t offset, |
299 | uint64_t bytes, QEMUIOVector *iov, | |
300 | int flags) | |
6542aa9c PL |
301 | { |
302 | NFSClient *client = bs->opaque; | |
303 | NFSRPC task; | |
304 | char *buf = NULL; | |
305 | ||
d746427a | 306 | nfs_co_init_task(bs, &task); |
6542aa9c | 307 | |
69785a22 PL |
308 | buf = g_try_malloc(bytes); |
309 | if (bytes && buf == NULL) { | |
2347dd7b KW |
310 | return -ENOMEM; |
311 | } | |
312 | ||
69785a22 | 313 | qemu_iovec_to_buf(iov, 0, buf, bytes); |
6542aa9c PL |
314 | |
315 | if (nfs_pwrite_async(client->context, client->fh, | |
69785a22 PL |
316 | offset, bytes, buf, |
317 | nfs_co_generic_cb, &task) != 0) { | |
6542aa9c PL |
318 | g_free(buf); |
319 | return -ENOMEM; | |
320 | } | |
321 | ||
aa92d6c4 | 322 | nfs_set_events(client); |
6542aa9c | 323 | while (!task.complete) { |
6542aa9c PL |
324 | qemu_coroutine_yield(); |
325 | } | |
326 | ||
327 | g_free(buf); | |
328 | ||
69785a22 | 329 | if (task.ret != bytes) { |
6542aa9c PL |
330 | return task.ret < 0 ? task.ret : -EIO; |
331 | } | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | static int coroutine_fn nfs_co_flush(BlockDriverState *bs) | |
337 | { | |
338 | NFSClient *client = bs->opaque; | |
339 | NFSRPC task; | |
340 | ||
d746427a | 341 | nfs_co_init_task(bs, &task); |
6542aa9c PL |
342 | |
343 | if (nfs_fsync_async(client->context, client->fh, nfs_co_generic_cb, | |
344 | &task) != 0) { | |
345 | return -ENOMEM; | |
346 | } | |
347 | ||
aa92d6c4 | 348 | nfs_set_events(client); |
6542aa9c | 349 | while (!task.complete) { |
6542aa9c PL |
350 | qemu_coroutine_yield(); |
351 | } | |
352 | ||
353 | return task.ret; | |
354 | } | |
355 | ||
6542aa9c PL |
356 | static QemuOptsList runtime_opts = { |
357 | .name = "nfs", | |
358 | .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), | |
359 | .desc = { | |
360 | { | |
94d6a7a7 | 361 | .name = "path", |
6542aa9c | 362 | .type = QEMU_OPT_STRING, |
94d6a7a7 AA |
363 | .help = "Path of the image on the host", |
364 | }, | |
365 | { | |
f67409a5 | 366 | .name = "user", |
94d6a7a7 AA |
367 | .type = QEMU_OPT_NUMBER, |
368 | .help = "UID value to use when talking to the server", | |
369 | }, | |
370 | { | |
f67409a5 | 371 | .name = "group", |
94d6a7a7 AA |
372 | .type = QEMU_OPT_NUMBER, |
373 | .help = "GID value to use when talking to the server", | |
374 | }, | |
375 | { | |
f67409a5 | 376 | .name = "tcp-syn-count", |
94d6a7a7 AA |
377 | .type = QEMU_OPT_NUMBER, |
378 | .help = "Number of SYNs to send during the session establish", | |
379 | }, | |
380 | { | |
f67409a5 | 381 | .name = "readahead-size", |
94d6a7a7 AA |
382 | .type = QEMU_OPT_NUMBER, |
383 | .help = "Set the readahead size in bytes", | |
384 | }, | |
385 | { | |
f67409a5 | 386 | .name = "page-cache-size", |
94d6a7a7 AA |
387 | .type = QEMU_OPT_NUMBER, |
388 | .help = "Set the pagecache size in bytes", | |
389 | }, | |
390 | { | |
391 | .name = "debug", | |
392 | .type = QEMU_OPT_NUMBER, | |
393 | .help = "Set the NFS debug level (max 2)", | |
6542aa9c PL |
394 | }, |
395 | { /* end of list */ } | |
396 | }, | |
397 | }; | |
398 | ||
471799d1 SH |
399 | static void nfs_detach_aio_context(BlockDriverState *bs) |
400 | { | |
401 | NFSClient *client = bs->opaque; | |
402 | ||
dca21ef2 | 403 | aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context), |
f6a51c84 | 404 | false, NULL, NULL, NULL, NULL); |
471799d1 SH |
405 | client->events = 0; |
406 | } | |
407 | ||
408 | static void nfs_attach_aio_context(BlockDriverState *bs, | |
409 | AioContext *new_context) | |
410 | { | |
411 | NFSClient *client = bs->opaque; | |
412 | ||
413 | client->aio_context = new_context; | |
414 | nfs_set_events(client); | |
415 | } | |
416 | ||
6542aa9c PL |
417 | static void nfs_client_close(NFSClient *client) |
418 | { | |
419 | if (client->context) { | |
420 | if (client->fh) { | |
421 | nfs_close(client->context, client->fh); | |
422 | } | |
dca21ef2 | 423 | aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context), |
f6a51c84 | 424 | false, NULL, NULL, NULL, NULL); |
6542aa9c PL |
425 | nfs_destroy_context(client->context); |
426 | } | |
427 | memset(client, 0, sizeof(NFSClient)); | |
428 | } | |
429 | ||
430 | static void nfs_file_close(BlockDriverState *bs) | |
431 | { | |
432 | NFSClient *client = bs->opaque; | |
433 | nfs_client_close(client); | |
434 | } | |
435 | ||
94d6a7a7 AA |
436 | static NFSServer *nfs_config(QDict *options, Error **errp) |
437 | { | |
438 | NFSServer *server = NULL; | |
439 | QDict *addr = NULL; | |
440 | QObject *crumpled_addr = NULL; | |
441 | Visitor *iv = NULL; | |
442 | Error *local_error = NULL; | |
443 | ||
444 | qdict_extract_subqdict(options, &addr, "server."); | |
445 | if (!qdict_size(addr)) { | |
446 | error_setg(errp, "NFS server address missing"); | |
447 | goto out; | |
448 | } | |
449 | ||
450 | crumpled_addr = qdict_crumple(addr, errp); | |
451 | if (!crumpled_addr) { | |
452 | goto out; | |
453 | } | |
454 | ||
455 | iv = qobject_input_visitor_new(crumpled_addr, true); | |
456 | visit_type_NFSServer(iv, NULL, &server, &local_error); | |
457 | if (local_error) { | |
458 | error_propagate(errp, local_error); | |
459 | goto out; | |
460 | } | |
461 | ||
462 | out: | |
463 | QDECREF(addr); | |
464 | qobject_decref(crumpled_addr); | |
465 | visit_free(iv); | |
466 | return server; | |
467 | } | |
468 | ||
469 | ||
470 | static int64_t nfs_client_open(NFSClient *client, QDict *options, | |
38f8d5e0 | 471 | int flags, Error **errp, int open_flags) |
6542aa9c | 472 | { |
94d6a7a7 AA |
473 | int ret = -EINVAL; |
474 | QemuOpts *opts = NULL; | |
475 | Error *local_err = NULL; | |
6542aa9c | 476 | struct stat st; |
6542aa9c PL |
477 | char *file = NULL, *strp = NULL; |
478 | ||
94d6a7a7 AA |
479 | opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); |
480 | qemu_opts_absorb_qdict(opts, options, &local_err); | |
481 | if (local_err) { | |
482 | error_propagate(errp, local_err); | |
483 | ret = -EINVAL; | |
5f4d5e1a HR |
484 | goto fail; |
485 | } | |
94d6a7a7 AA |
486 | |
487 | client->path = g_strdup(qemu_opt_get(opts, "path")); | |
488 | if (!client->path) { | |
489 | ret = -EINVAL; | |
490 | error_setg(errp, "No path was specified"); | |
6542aa9c PL |
491 | goto fail; |
492 | } | |
94d6a7a7 AA |
493 | |
494 | strp = strrchr(client->path, '/'); | |
6542aa9c PL |
495 | if (strp == NULL) { |
496 | error_setg(errp, "Invalid URL specified"); | |
497 | goto fail; | |
498 | } | |
499 | file = g_strdup(strp); | |
500 | *strp = 0; | |
501 | ||
94d6a7a7 AA |
502 | /* Pop the config into our state object, Exit if invalid */ |
503 | client->server = nfs_config(options, errp); | |
504 | if (!client->server) { | |
505 | ret = -EINVAL; | |
506 | goto fail; | |
507 | } | |
508 | ||
6542aa9c PL |
509 | client->context = nfs_init_context(); |
510 | if (client->context == NULL) { | |
511 | error_setg(errp, "Failed to init NFS context"); | |
512 | goto fail; | |
513 | } | |
514 | ||
f67409a5 PL |
515 | if (qemu_opt_get(opts, "user")) { |
516 | client->uid = qemu_opt_get_number(opts, "user", 0); | |
94d6a7a7 AA |
517 | nfs_set_uid(client->context, client->uid); |
518 | } | |
519 | ||
f67409a5 PL |
520 | if (qemu_opt_get(opts, "group")) { |
521 | client->gid = qemu_opt_get_number(opts, "group", 0); | |
94d6a7a7 AA |
522 | nfs_set_gid(client->context, client->gid); |
523 | } | |
524 | ||
f67409a5 PL |
525 | if (qemu_opt_get(opts, "tcp-syn-count")) { |
526 | client->tcp_syncnt = qemu_opt_get_number(opts, "tcp-syn-count", 0); | |
94d6a7a7 AA |
527 | nfs_set_tcp_syncnt(client->context, client->tcp_syncnt); |
528 | } | |
529 | ||
530 | #ifdef LIBNFS_FEATURE_READAHEAD | |
f67409a5 | 531 | if (qemu_opt_get(opts, "readahead-size")) { |
94d6a7a7 AA |
532 | if (open_flags & BDRV_O_NOCACHE) { |
533 | error_setg(errp, "Cannot enable NFS readahead " | |
534 | "if cache.direct = on"); | |
6542aa9c PL |
535 | goto fail; |
536 | } | |
f67409a5 | 537 | client->readahead = qemu_opt_get_number(opts, "readahead-size", 0); |
94d6a7a7 AA |
538 | if (client->readahead > QEMU_NFS_MAX_READAHEAD_SIZE) { |
539 | error_report("NFS Warning: Truncating NFS readahead " | |
540 | "size to %d", QEMU_NFS_MAX_READAHEAD_SIZE); | |
541 | client->readahead = QEMU_NFS_MAX_READAHEAD_SIZE; | |
7c24384b | 542 | } |
94d6a7a7 | 543 | nfs_set_readahead(client->context, client->readahead); |
d99b26c4 | 544 | #ifdef LIBNFS_FEATURE_PAGECACHE |
94d6a7a7 | 545 | nfs_set_pagecache_ttl(client->context, 0); |
d99b26c4 | 546 | #endif |
94d6a7a7 AA |
547 | client->cache_used = true; |
548 | } | |
d99b26c4 | 549 | #endif |
94d6a7a7 | 550 | |
d99b26c4 | 551 | #ifdef LIBNFS_FEATURE_PAGECACHE |
f67409a5 | 552 | if (qemu_opt_get(opts, "page-cache-size")) { |
94d6a7a7 AA |
553 | if (open_flags & BDRV_O_NOCACHE) { |
554 | error_setg(errp, "Cannot enable NFS pagecache " | |
555 | "if cache.direct = on"); | |
556 | goto fail; | |
557 | } | |
f67409a5 | 558 | client->pagecache = qemu_opt_get_number(opts, "page-cache-size", 0); |
94d6a7a7 AA |
559 | if (client->pagecache > QEMU_NFS_MAX_PAGECACHE_SIZE) { |
560 | error_report("NFS Warning: Truncating NFS pagecache " | |
561 | "size to %d pages", QEMU_NFS_MAX_PAGECACHE_SIZE); | |
562 | client->pagecache = QEMU_NFS_MAX_PAGECACHE_SIZE; | |
563 | } | |
564 | nfs_set_pagecache(client->context, client->pagecache); | |
565 | nfs_set_pagecache_ttl(client->context, 0); | |
566 | client->cache_used = true; | |
567 | } | |
7725b8bf | 568 | #endif |
94d6a7a7 | 569 | |
7725b8bf | 570 | #ifdef LIBNFS_FEATURE_DEBUG |
94d6a7a7 AA |
571 | if (qemu_opt_get(opts, "debug")) { |
572 | client->debug = qemu_opt_get_number(opts, "debug", 0); | |
573 | /* limit the maximum debug level to avoid potential flooding | |
574 | * of our log files. */ | |
575 | if (client->debug > QEMU_NFS_MAX_DEBUG_LEVEL) { | |
576 | error_report("NFS Warning: Limiting NFS debug level " | |
577 | "to %d", QEMU_NFS_MAX_DEBUG_LEVEL); | |
578 | client->debug = QEMU_NFS_MAX_DEBUG_LEVEL; | |
6542aa9c | 579 | } |
94d6a7a7 | 580 | nfs_set_debug(client->context, client->debug); |
6542aa9c | 581 | } |
94d6a7a7 | 582 | #endif |
6542aa9c | 583 | |
94d6a7a7 | 584 | ret = nfs_mount(client->context, client->server->host, client->path); |
6542aa9c PL |
585 | if (ret < 0) { |
586 | error_setg(errp, "Failed to mount nfs share: %s", | |
587 | nfs_get_error(client->context)); | |
588 | goto fail; | |
589 | } | |
590 | ||
591 | if (flags & O_CREAT) { | |
592 | ret = nfs_creat(client->context, file, 0600, &client->fh); | |
593 | if (ret < 0) { | |
594 | error_setg(errp, "Failed to create file: %s", | |
595 | nfs_get_error(client->context)); | |
596 | goto fail; | |
597 | } | |
598 | } else { | |
599 | ret = nfs_open(client->context, file, flags, &client->fh); | |
600 | if (ret < 0) { | |
601 | error_setg(errp, "Failed to open file : %s", | |
602 | nfs_get_error(client->context)); | |
603 | goto fail; | |
604 | } | |
605 | } | |
606 | ||
607 | ret = nfs_fstat(client->context, client->fh, &st); | |
608 | if (ret < 0) { | |
609 | error_setg(errp, "Failed to fstat file: %s", | |
610 | nfs_get_error(client->context)); | |
611 | goto fail; | |
612 | } | |
613 | ||
614 | ret = DIV_ROUND_UP(st.st_size, BDRV_SECTOR_SIZE); | |
18a8056e | 615 | client->st_blocks = st.st_blocks; |
6542aa9c | 616 | client->has_zero_init = S_ISREG(st.st_mode); |
94d6a7a7 | 617 | *strp = '/'; |
6542aa9c | 618 | goto out; |
94d6a7a7 | 619 | |
6542aa9c PL |
620 | fail: |
621 | nfs_client_close(client); | |
622 | out: | |
94d6a7a7 | 623 | qemu_opts_del(opts); |
6542aa9c PL |
624 | g_free(file); |
625 | return ret; | |
626 | } | |
627 | ||
628 | static int nfs_file_open(BlockDriverState *bs, QDict *options, int flags, | |
629 | Error **errp) { | |
630 | NFSClient *client = bs->opaque; | |
631 | int64_t ret; | |
6542aa9c | 632 | |
471799d1 SH |
633 | client->aio_context = bdrv_get_aio_context(bs); |
634 | ||
94d6a7a7 | 635 | ret = nfs_client_open(client, options, |
6542aa9c | 636 | (flags & BDRV_O_RDWR) ? O_RDWR : O_RDONLY, |
38f8d5e0 | 637 | errp, bs->open_flags); |
6542aa9c | 638 | if (ret < 0) { |
94d6a7a7 | 639 | return ret; |
6542aa9c PL |
640 | } |
641 | bs->total_sectors = ret; | |
810f4f86 | 642 | ret = 0; |
810f4f86 | 643 | return ret; |
6542aa9c PL |
644 | } |
645 | ||
fd752801 HR |
646 | static QemuOptsList nfs_create_opts = { |
647 | .name = "nfs-create-opts", | |
648 | .head = QTAILQ_HEAD_INITIALIZER(nfs_create_opts.head), | |
649 | .desc = { | |
650 | { | |
651 | .name = BLOCK_OPT_SIZE, | |
652 | .type = QEMU_OPT_SIZE, | |
653 | .help = "Virtual disk size" | |
654 | }, | |
655 | { /* end of list */ } | |
656 | } | |
657 | }; | |
658 | ||
98c10b81 | 659 | static int nfs_file_create(const char *url, QemuOpts *opts, Error **errp) |
6542aa9c PL |
660 | { |
661 | int ret = 0; | |
662 | int64_t total_size = 0; | |
5839e53b | 663 | NFSClient *client = g_new0(NFSClient, 1); |
94d6a7a7 | 664 | QDict *options = NULL; |
6542aa9c | 665 | |
471799d1 SH |
666 | client->aio_context = qemu_get_aio_context(); |
667 | ||
6542aa9c | 668 | /* Read out options */ |
c2eb918e HT |
669 | total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), |
670 | BDRV_SECTOR_SIZE); | |
6542aa9c | 671 | |
94d6a7a7 AA |
672 | options = qdict_new(); |
673 | ret = nfs_parse_uri(url, options, errp); | |
674 | if (ret < 0) { | |
675 | goto out; | |
676 | } | |
677 | ||
678 | ret = nfs_client_open(client, options, O_CREAT, errp, 0); | |
6542aa9c PL |
679 | if (ret < 0) { |
680 | goto out; | |
681 | } | |
682 | ret = nfs_ftruncate(client->context, client->fh, total_size); | |
683 | nfs_client_close(client); | |
684 | out: | |
07555ba6 | 685 | QDECREF(options); |
6542aa9c PL |
686 | g_free(client); |
687 | return ret; | |
688 | } | |
689 | ||
690 | static int nfs_has_zero_init(BlockDriverState *bs) | |
691 | { | |
692 | NFSClient *client = bs->opaque; | |
693 | return client->has_zero_init; | |
694 | } | |
695 | ||
d746427a PB |
696 | static void |
697 | nfs_get_allocated_file_size_cb(int ret, struct nfs_context *nfs, void *data, | |
698 | void *private_data) | |
699 | { | |
700 | NFSRPC *task = private_data; | |
701 | task->ret = ret; | |
702 | if (task->ret == 0) { | |
703 | memcpy(task->st, data, sizeof(struct stat)); | |
704 | } | |
705 | if (task->ret < 0) { | |
706 | error_report("NFS Error: %s", nfs_get_error(nfs)); | |
707 | } | |
708 | task->complete = 1; | |
c9d1a561 | 709 | bdrv_wakeup(task->bs); |
d746427a PB |
710 | } |
711 | ||
6542aa9c PL |
712 | static int64_t nfs_get_allocated_file_size(BlockDriverState *bs) |
713 | { | |
714 | NFSClient *client = bs->opaque; | |
715 | NFSRPC task = {0}; | |
716 | struct stat st; | |
717 | ||
18a8056e PL |
718 | if (bdrv_is_read_only(bs) && |
719 | !(bs->open_flags & BDRV_O_NOCACHE)) { | |
720 | return client->st_blocks * 512; | |
721 | } | |
722 | ||
d746427a | 723 | task.bs = bs; |
6542aa9c | 724 | task.st = &st; |
d746427a | 725 | if (nfs_fstat_async(client->context, client->fh, nfs_get_allocated_file_size_cb, |
6542aa9c PL |
726 | &task) != 0) { |
727 | return -ENOMEM; | |
728 | } | |
729 | ||
aa92d6c4 | 730 | nfs_set_events(client); |
d746427a | 731 | BDRV_POLL_WHILE(bs, !task.complete); |
6542aa9c | 732 | |
055c6f91 | 733 | return (task.ret < 0 ? task.ret : st.st_blocks * 512); |
6542aa9c PL |
734 | } |
735 | ||
736 | static int nfs_file_truncate(BlockDriverState *bs, int64_t offset) | |
737 | { | |
738 | NFSClient *client = bs->opaque; | |
739 | return nfs_ftruncate(client->context, client->fh, offset); | |
740 | } | |
741 | ||
18a8056e PL |
742 | /* Note that this will not re-establish a connection with the NFS server |
743 | * - it is effectively a NOP. */ | |
744 | static int nfs_reopen_prepare(BDRVReopenState *state, | |
745 | BlockReopenQueue *queue, Error **errp) | |
746 | { | |
747 | NFSClient *client = state->bs->opaque; | |
748 | struct stat st; | |
749 | int ret = 0; | |
750 | ||
751 | if (state->flags & BDRV_O_RDWR && bdrv_is_read_only(state->bs)) { | |
752 | error_setg(errp, "Cannot open a read-only mount as read-write"); | |
753 | return -EACCES; | |
754 | } | |
755 | ||
38f8d5e0 | 756 | if ((state->flags & BDRV_O_NOCACHE) && client->cache_used) { |
d99b26c4 PL |
757 | error_setg(errp, "Cannot disable cache if libnfs readahead or" |
758 | " pagecache is enabled"); | |
38f8d5e0 PL |
759 | return -EINVAL; |
760 | } | |
761 | ||
18a8056e PL |
762 | /* Update cache for read-only reopens */ |
763 | if (!(state->flags & BDRV_O_RDWR)) { | |
764 | ret = nfs_fstat(client->context, client->fh, &st); | |
765 | if (ret < 0) { | |
766 | error_setg(errp, "Failed to fstat file: %s", | |
767 | nfs_get_error(client->context)); | |
768 | return ret; | |
769 | } | |
770 | client->st_blocks = st.st_blocks; | |
771 | } | |
772 | ||
773 | return 0; | |
774 | } | |
775 | ||
94d6a7a7 AA |
776 | static void nfs_refresh_filename(BlockDriverState *bs, QDict *options) |
777 | { | |
778 | NFSClient *client = bs->opaque; | |
779 | QDict *opts = qdict_new(); | |
780 | QObject *server_qdict; | |
781 | Visitor *ov; | |
782 | ||
783 | qdict_put(opts, "driver", qstring_from_str("nfs")); | |
784 | ||
785 | if (client->uid && !client->gid) { | |
786 | snprintf(bs->exact_filename, sizeof(bs->exact_filename), | |
787 | "nfs://%s%s?uid=%" PRId64, client->server->host, client->path, | |
788 | client->uid); | |
789 | } else if (!client->uid && client->gid) { | |
790 | snprintf(bs->exact_filename, sizeof(bs->exact_filename), | |
791 | "nfs://%s%s?gid=%" PRId64, client->server->host, client->path, | |
792 | client->gid); | |
793 | } else if (client->uid && client->gid) { | |
794 | snprintf(bs->exact_filename, sizeof(bs->exact_filename), | |
795 | "nfs://%s%s?uid=%" PRId64 "&gid=%" PRId64, | |
796 | client->server->host, client->path, client->uid, client->gid); | |
797 | } else { | |
798 | snprintf(bs->exact_filename, sizeof(bs->exact_filename), | |
799 | "nfs://%s%s", client->server->host, client->path); | |
800 | } | |
801 | ||
802 | ov = qobject_output_visitor_new(&server_qdict); | |
803 | visit_type_NFSServer(ov, NULL, &client->server, &error_abort); | |
804 | visit_complete(ov, &server_qdict); | |
94d6a7a7 AA |
805 | qdict_put_obj(opts, "server", server_qdict); |
806 | qdict_put(opts, "path", qstring_from_str(client->path)); | |
807 | ||
808 | if (client->uid) { | |
f67409a5 | 809 | qdict_put(opts, "user", qint_from_int(client->uid)); |
94d6a7a7 AA |
810 | } |
811 | if (client->gid) { | |
f67409a5 | 812 | qdict_put(opts, "group", qint_from_int(client->gid)); |
94d6a7a7 AA |
813 | } |
814 | if (client->tcp_syncnt) { | |
f67409a5 PL |
815 | qdict_put(opts, "tcp-syn-cnt", |
816 | qint_from_int(client->tcp_syncnt)); | |
94d6a7a7 AA |
817 | } |
818 | if (client->readahead) { | |
f67409a5 PL |
819 | qdict_put(opts, "readahead-size", |
820 | qint_from_int(client->readahead)); | |
94d6a7a7 AA |
821 | } |
822 | if (client->pagecache) { | |
f67409a5 PL |
823 | qdict_put(opts, "page-cache-size", |
824 | qint_from_int(client->pagecache)); | |
94d6a7a7 AA |
825 | } |
826 | if (client->debug) { | |
827 | qdict_put(opts, "debug", qint_from_int(client->debug)); | |
828 | } | |
829 | ||
830 | visit_free(ov); | |
831 | qdict_flatten(opts); | |
832 | bs->full_open_options = opts; | |
833 | } | |
834 | ||
d99b26c4 PL |
835 | #ifdef LIBNFS_FEATURE_PAGECACHE |
836 | static void nfs_invalidate_cache(BlockDriverState *bs, | |
837 | Error **errp) | |
838 | { | |
839 | NFSClient *client = bs->opaque; | |
840 | nfs_pagecache_invalidate(client->context, client->fh); | |
841 | } | |
842 | #endif | |
843 | ||
6542aa9c | 844 | static BlockDriver bdrv_nfs = { |
471799d1 SH |
845 | .format_name = "nfs", |
846 | .protocol_name = "nfs", | |
847 | ||
848 | .instance_size = sizeof(NFSClient), | |
94d6a7a7 | 849 | .bdrv_parse_filename = nfs_parse_filename, |
fd752801 HR |
850 | .create_opts = &nfs_create_opts, |
851 | ||
471799d1 SH |
852 | .bdrv_has_zero_init = nfs_has_zero_init, |
853 | .bdrv_get_allocated_file_size = nfs_get_allocated_file_size, | |
854 | .bdrv_truncate = nfs_file_truncate, | |
855 | ||
856 | .bdrv_file_open = nfs_file_open, | |
857 | .bdrv_close = nfs_file_close, | |
c282e1fd | 858 | .bdrv_create = nfs_file_create, |
18a8056e | 859 | .bdrv_reopen_prepare = nfs_reopen_prepare, |
471799d1 | 860 | |
69785a22 PL |
861 | .bdrv_co_preadv = nfs_co_preadv, |
862 | .bdrv_co_pwritev = nfs_co_pwritev, | |
471799d1 SH |
863 | .bdrv_co_flush_to_disk = nfs_co_flush, |
864 | ||
865 | .bdrv_detach_aio_context = nfs_detach_aio_context, | |
866 | .bdrv_attach_aio_context = nfs_attach_aio_context, | |
94d6a7a7 | 867 | .bdrv_refresh_filename = nfs_refresh_filename, |
d99b26c4 PL |
868 | |
869 | #ifdef LIBNFS_FEATURE_PAGECACHE | |
870 | .bdrv_invalidate_cache = nfs_invalidate_cache, | |
871 | #endif | |
6542aa9c PL |
872 | }; |
873 | ||
874 | static void nfs_block_init(void) | |
875 | { | |
876 | bdrv_register(&bdrv_nfs); | |
877 | } | |
878 | ||
879 | block_init(nfs_block_init); |