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