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25#include "qemu/osdep.h"
26
27#if !defined(_WIN32)
28#include <poll.h>
29#endif
30#include "qemu/config-file.h"
31#include "qemu/error-report.h"
32#include "qapi/error.h"
33#include "block/block_int.h"
34#include "block/qdict.h"
35#include "trace.h"
36#include "qemu/iov.h"
37#include "qemu/main-loop.h"
38#include "qemu/module.h"
39#include "qemu/option.h"
40#include "qemu/uri.h"
41#include "qemu/cutils.h"
42#include "sysemu/replay.h"
43#include "qapi/qapi-visit-block-core.h"
44#include "qapi/qmp/qdict.h"
45#include "qapi/qmp/qstring.h"
46#include "qapi/qobject-input-visitor.h"
47#include "qapi/qobject-output-visitor.h"
48#include <nfsc/libnfs.h>
49
50
51#define QEMU_NFS_MAX_READAHEAD_SIZE 1048576
52#define QEMU_NFS_MAX_PAGECACHE_SIZE (8388608 / NFS_BLKSIZE)
53#define QEMU_NFS_MAX_DEBUG_LEVEL 2
54
55typedef struct NFSClient {
56 struct nfs_context *context;
57 struct nfsfh *fh;
58 int events;
59 bool has_zero_init;
60 AioContext *aio_context;
61 QemuMutex mutex;
62 uint64_t st_blocks;
63 bool cache_used;
64 NFSServer *server;
65 char *path;
66 int64_t uid, gid, tcp_syncnt, readahead, pagecache, debug;
67} NFSClient;
68
69typedef struct NFSRPC {
70 BlockDriverState *bs;
71 int ret;
72 int complete;
73 QEMUIOVector *iov;
74 struct stat *st;
75 Coroutine *co;
76 NFSClient *client;
77} NFSRPC;
78
79static int nfs_parse_uri(const char *filename, QDict *options, Error **errp)
80{
81 URI *uri = NULL;
82 QueryParams *qp = NULL;
83 int ret = -EINVAL, i;
84
85 uri = uri_parse(filename);
86 if (!uri) {
87 error_setg(errp, "Invalid URI specified");
88 goto out;
89 }
90 if (g_strcmp0(uri->scheme, "nfs") != 0) {
91 error_setg(errp, "URI scheme must be 'nfs'");
92 goto out;
93 }
94
95 if (!uri->server) {
96 error_setg(errp, "missing hostname in URI");
97 goto out;
98 }
99
100 if (!uri->path) {
101 error_setg(errp, "missing file path in URI");
102 goto out;
103 }
104
105 qp = query_params_parse(uri->query);
106 if (!qp) {
107 error_setg(errp, "could not parse query parameters");
108 goto out;
109 }
110
111 qdict_put_str(options, "server.host", uri->server);
112 qdict_put_str(options, "server.type", "inet");
113 qdict_put_str(options, "path", uri->path);
114
115 for (i = 0; i < qp->n; i++) {
116 unsigned long long val;
117 if (!qp->p[i].value) {
118 error_setg(errp, "Value for NFS parameter expected: %s",
119 qp->p[i].name);
120 goto out;
121 }
122 if (parse_uint_full(qp->p[i].value, &val, 0)) {
123 error_setg(errp, "Illegal value for NFS parameter: %s",
124 qp->p[i].name);
125 goto out;
126 }
127 if (!strcmp(qp->p[i].name, "uid")) {
128 qdict_put_str(options, "user", qp->p[i].value);
129 } else if (!strcmp(qp->p[i].name, "gid")) {
130 qdict_put_str(options, "group", qp->p[i].value);
131 } else if (!strcmp(qp->p[i].name, "tcp-syncnt")) {
132 qdict_put_str(options, "tcp-syn-count", qp->p[i].value);
133 } else if (!strcmp(qp->p[i].name, "readahead")) {
134 qdict_put_str(options, "readahead-size", qp->p[i].value);
135 } else if (!strcmp(qp->p[i].name, "pagecache")) {
136 qdict_put_str(options, "page-cache-size", qp->p[i].value);
137 } else if (!strcmp(qp->p[i].name, "debug")) {
138 qdict_put_str(options, "debug", 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;
146out:
147 if (qp) {
148 query_params_free(qp);
149 }
150 uri_free(uri);
151 return ret;
152}
153
154static bool nfs_has_filename_options_conflict(QDict *options, Error **errp)
155{
156 const QDictEntry *qe;
157
158 for (qe = qdict_first(options); qe; qe = qdict_next(options, qe)) {
159 if (!strcmp(qe->key, "host") ||
160 !strcmp(qe->key, "path") ||
161 !strcmp(qe->key, "user") ||
162 !strcmp(qe->key, "group") ||
163 !strcmp(qe->key, "tcp-syn-count") ||
164 !strcmp(qe->key, "readahead-size") ||
165 !strcmp(qe->key, "page-cache-size") ||
166 !strcmp(qe->key, "debug") ||
167 strstart(qe->key, "server.", NULL))
168 {
169 error_setg(errp, "Option %s cannot be used with a filename",
170 qe->key);
171 return true;
172 }
173 }
174
175 return false;
176}
177
178static void nfs_parse_filename(const char *filename, QDict *options,
179 Error **errp)
180{
181 if (nfs_has_filename_options_conflict(options, errp)) {
182 return;
183 }
184
185 nfs_parse_uri(filename, options, errp);
186}
187
188static void nfs_process_read(void *arg);
189static void nfs_process_write(void *arg);
190
191
192static void nfs_set_events(NFSClient *client)
193{
194 int ev = nfs_which_events(client->context);
195 if (ev != client->events) {
196 aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
197 false,
198 (ev & POLLIN) ? nfs_process_read : NULL,
199 (ev & POLLOUT) ? nfs_process_write : NULL,
200 NULL, NULL, client);
201
202 }
203 client->events = ev;
204}
205
206static void nfs_process_read(void *arg)
207{
208 NFSClient *client = arg;
209
210 qemu_mutex_lock(&client->mutex);
211 nfs_service(client->context, POLLIN);
212 nfs_set_events(client);
213 qemu_mutex_unlock(&client->mutex);
214}
215
216static void nfs_process_write(void *arg)
217{
218 NFSClient *client = arg;
219
220 qemu_mutex_lock(&client->mutex);
221 nfs_service(client->context, POLLOUT);
222 nfs_set_events(client);
223 qemu_mutex_unlock(&client->mutex);
224}
225
226static void nfs_co_init_task(BlockDriverState *bs, NFSRPC *task)
227{
228 *task = (NFSRPC) {
229 .co = qemu_coroutine_self(),
230 .bs = bs,
231 .client = bs->opaque,
232 };
233}
234
235static void nfs_co_generic_bh_cb(void *opaque)
236{
237 NFSRPC *task = opaque;
238
239 task->complete = 1;
240 aio_co_wake(task->co);
241}
242
243
244static void
245nfs_co_generic_cb(int ret, struct nfs_context *nfs, void *data,
246 void *private_data)
247{
248 NFSRPC *task = private_data;
249 task->ret = ret;
250 assert(!task->st);
251 if (task->ret > 0 && task->iov) {
252 if (task->ret <= task->iov->size) {
253 qemu_iovec_from_buf(task->iov, 0, data, task->ret);
254 } else {
255 task->ret = -EIO;
256 }
257 }
258 if (task->ret < 0) {
259 error_report("NFS Error: %s", nfs_get_error(nfs));
260 }
261 replay_bh_schedule_oneshot_event(task->client->aio_context,
262 nfs_co_generic_bh_cb, task);
263}
264
265static int coroutine_fn nfs_co_preadv(BlockDriverState *bs, int64_t offset,
266 int64_t bytes, QEMUIOVector *iov,
267 BdrvRequestFlags flags)
268{
269 NFSClient *client = bs->opaque;
270 NFSRPC task;
271
272 nfs_co_init_task(bs, &task);
273 task.iov = iov;
274
275 WITH_QEMU_LOCK_GUARD(&client->mutex) {
276 if (nfs_pread_async(client->context, client->fh,
277 offset, bytes, nfs_co_generic_cb, &task) != 0) {
278 return -ENOMEM;
279 }
280
281 nfs_set_events(client);
282 }
283 while (!task.complete) {
284 qemu_coroutine_yield();
285 }
286
287 if (task.ret < 0) {
288 return task.ret;
289 }
290
291
292 if (task.ret < iov->size) {
293 qemu_iovec_memset(iov, task.ret, 0, iov->size - task.ret);
294 }
295
296 return 0;
297}
298
299static int coroutine_fn nfs_co_pwritev(BlockDriverState *bs, int64_t offset,
300 int64_t bytes, QEMUIOVector *iov,
301 BdrvRequestFlags flags)
302{
303 NFSClient *client = bs->opaque;
304 NFSRPC task;
305 char *buf = NULL;
306 bool my_buffer = false;
307
308 nfs_co_init_task(bs, &task);
309
310 if (iov->niov != 1) {
311 buf = g_try_malloc(bytes);
312 if (bytes && buf == NULL) {
313 return -ENOMEM;
314 }
315 qemu_iovec_to_buf(iov, 0, buf, bytes);
316 my_buffer = true;
317 } else {
318 buf = iov->iov[0].iov_base;
319 }
320
321 WITH_QEMU_LOCK_GUARD(&client->mutex) {
322 if (nfs_pwrite_async(client->context, client->fh,
323 offset, bytes, buf,
324 nfs_co_generic_cb, &task) != 0) {
325 if (my_buffer) {
326 g_free(buf);
327 }
328 return -ENOMEM;
329 }
330
331 nfs_set_events(client);
332 }
333 while (!task.complete) {
334 qemu_coroutine_yield();
335 }
336
337 if (my_buffer) {
338 g_free(buf);
339 }
340
341 if (task.ret != bytes) {
342 return task.ret < 0 ? task.ret : -EIO;
343 }
344
345 return 0;
346}
347
348static int coroutine_fn nfs_co_flush(BlockDriverState *bs)
349{
350 NFSClient *client = bs->opaque;
351 NFSRPC task;
352
353 nfs_co_init_task(bs, &task);
354
355 WITH_QEMU_LOCK_GUARD(&client->mutex) {
356 if (nfs_fsync_async(client->context, client->fh, nfs_co_generic_cb,
357 &task) != 0) {
358 return -ENOMEM;
359 }
360
361 nfs_set_events(client);
362 }
363 while (!task.complete) {
364 qemu_coroutine_yield();
365 }
366
367 return task.ret;
368}
369
370static void nfs_detach_aio_context(BlockDriverState *bs)
371{
372 NFSClient *client = bs->opaque;
373
374 aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
375 false, NULL, NULL, NULL, NULL, NULL);
376 client->events = 0;
377}
378
379static void nfs_attach_aio_context(BlockDriverState *bs,
380 AioContext *new_context)
381{
382 NFSClient *client = bs->opaque;
383
384 client->aio_context = new_context;
385 nfs_set_events(client);
386}
387
388static void nfs_client_close(NFSClient *client)
389{
390 if (client->context) {
391 qemu_mutex_lock(&client->mutex);
392 aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
393 false, NULL, NULL, NULL, NULL, NULL);
394 qemu_mutex_unlock(&client->mutex);
395 if (client->fh) {
396 nfs_close(client->context, client->fh);
397 client->fh = NULL;
398 }
399#ifdef LIBNFS_FEATURE_UMOUNT
400 nfs_umount(client->context);
401#endif
402 nfs_destroy_context(client->context);
403 client->context = NULL;
404 }
405 g_free(client->path);
406 qemu_mutex_destroy(&client->mutex);
407 qapi_free_NFSServer(client->server);
408 client->server = NULL;
409}
410
411static void nfs_file_close(BlockDriverState *bs)
412{
413 NFSClient *client = bs->opaque;
414 nfs_client_close(client);
415}
416
417static int64_t nfs_client_open(NFSClient *client, BlockdevOptionsNfs *opts,
418 int flags, int open_flags, Error **errp)
419{
420 int64_t ret = -EINVAL;
421 struct stat st;
422 char *file = NULL, *strp = NULL;
423
424 qemu_mutex_init(&client->mutex);
425
426 client->path = g_strdup(opts->path);
427
428 strp = strrchr(client->path, '/');
429 if (strp == NULL) {
430 error_setg(errp, "Invalid URL specified");
431 goto fail;
432 }
433 file = g_strdup(strp);
434 *strp = 0;
435
436
437
438 client->server = opts->server;
439 opts->server = NULL;
440
441 client->context = nfs_init_context();
442 if (client->context == NULL) {
443 error_setg(errp, "Failed to init NFS context");
444 goto fail;
445 }
446
447 if (opts->has_user) {
448 client->uid = opts->user;
449 nfs_set_uid(client->context, client->uid);
450 }
451
452 if (opts->has_group) {
453 client->gid = opts->group;
454 nfs_set_gid(client->context, client->gid);
455 }
456
457 if (opts->has_tcp_syn_count) {
458 client->tcp_syncnt = opts->tcp_syn_count;
459 nfs_set_tcp_syncnt(client->context, client->tcp_syncnt);
460 }
461
462#ifdef LIBNFS_FEATURE_READAHEAD
463 if (opts->has_readahead_size) {
464 if (open_flags & BDRV_O_NOCACHE) {
465 error_setg(errp, "Cannot enable NFS readahead "
466 "if cache.direct = on");
467 goto fail;
468 }
469 client->readahead = opts->readahead_size;
470 if (client->readahead > QEMU_NFS_MAX_READAHEAD_SIZE) {
471 warn_report("Truncating NFS readahead size to %d",
472 QEMU_NFS_MAX_READAHEAD_SIZE);
473 client->readahead = QEMU_NFS_MAX_READAHEAD_SIZE;
474 }
475 nfs_set_readahead(client->context, client->readahead);
476#ifdef LIBNFS_FEATURE_PAGECACHE
477 nfs_set_pagecache_ttl(client->context, 0);
478#endif
479 client->cache_used = true;
480 }
481#endif
482
483#ifdef LIBNFS_FEATURE_PAGECACHE
484 if (opts->has_page_cache_size) {
485 if (open_flags & BDRV_O_NOCACHE) {
486 error_setg(errp, "Cannot enable NFS pagecache "
487 "if cache.direct = on");
488 goto fail;
489 }
490 client->pagecache = opts->page_cache_size;
491 if (client->pagecache > QEMU_NFS_MAX_PAGECACHE_SIZE) {
492 warn_report("Truncating NFS pagecache size to %d pages",
493 QEMU_NFS_MAX_PAGECACHE_SIZE);
494 client->pagecache = QEMU_NFS_MAX_PAGECACHE_SIZE;
495 }
496 nfs_set_pagecache(client->context, client->pagecache);
497 nfs_set_pagecache_ttl(client->context, 0);
498 client->cache_used = true;
499 }
500#endif
501
502#ifdef LIBNFS_FEATURE_DEBUG
503 if (opts->has_debug) {
504 client->debug = opts->debug;
505
506
507 if (client->debug > QEMU_NFS_MAX_DEBUG_LEVEL) {
508 warn_report("Limiting NFS debug level to %d",
509 QEMU_NFS_MAX_DEBUG_LEVEL);
510 client->debug = QEMU_NFS_MAX_DEBUG_LEVEL;
511 }
512 nfs_set_debug(client->context, client->debug);
513 }
514#endif
515
516 ret = nfs_mount(client->context, client->server->host, client->path);
517 if (ret < 0) {
518 error_setg(errp, "Failed to mount nfs share: %s",
519 nfs_get_error(client->context));
520 goto fail;
521 }
522
523 if (flags & O_CREAT) {
524 ret = nfs_creat(client->context, file, 0600, &client->fh);
525 if (ret < 0) {
526 error_setg(errp, "Failed to create file: %s",
527 nfs_get_error(client->context));
528 goto fail;
529 }
530 } else {
531 ret = nfs_open(client->context, file, flags, &client->fh);
532 if (ret < 0) {
533 error_setg(errp, "Failed to open file : %s",
534 nfs_get_error(client->context));
535 goto fail;
536 }
537 }
538
539 ret = nfs_fstat(client->context, client->fh, &st);
540 if (ret < 0) {
541 error_setg(errp, "Failed to fstat file: %s",
542 nfs_get_error(client->context));
543 goto fail;
544 }
545
546 ret = DIV_ROUND_UP(st.st_size, BDRV_SECTOR_SIZE);
547#if !defined(_WIN32)
548 client->st_blocks = st.st_blocks;
549#endif
550 client->has_zero_init = S_ISREG(st.st_mode);
551 *strp = '/';
552 goto out;
553
554fail:
555 nfs_client_close(client);
556out:
557 g_free(file);
558 return ret;
559}
560
561static BlockdevOptionsNfs *nfs_options_qdict_to_qapi(QDict *options,
562 Error **errp)
563{
564 BlockdevOptionsNfs *opts = NULL;
565 Visitor *v;
566 const QDictEntry *e;
567
568 v = qobject_input_visitor_new_flat_confused(options, errp);
569 if (!v) {
570 return NULL;
571 }
572
573 visit_type_BlockdevOptionsNfs(v, NULL, &opts, errp);
574 visit_free(v);
575 if (!opts) {
576 return NULL;
577 }
578
579
580
581 while ((e = qdict_first(options))) {
582 qdict_del(options, e->key);
583 }
584
585 return opts;
586}
587
588static int64_t nfs_client_open_qdict(NFSClient *client, QDict *options,
589 int flags, int open_flags, Error **errp)
590{
591 BlockdevOptionsNfs *opts;
592 int64_t ret;
593
594 opts = nfs_options_qdict_to_qapi(options, errp);
595 if (opts == NULL) {
596 ret = -EINVAL;
597 goto fail;
598 }
599
600 ret = nfs_client_open(client, opts, flags, open_flags, errp);
601fail:
602 qapi_free_BlockdevOptionsNfs(opts);
603 return ret;
604}
605
606static int nfs_file_open(BlockDriverState *bs, QDict *options, int flags,
607 Error **errp) {
608 NFSClient *client = bs->opaque;
609 int64_t ret;
610
611 client->aio_context = bdrv_get_aio_context(bs);
612
613 ret = nfs_client_open_qdict(client, options,
614 (flags & BDRV_O_RDWR) ? O_RDWR : O_RDONLY,
615 bs->open_flags, errp);
616 if (ret < 0) {
617 return ret;
618 }
619
620 bs->total_sectors = ret;
621 if (client->has_zero_init) {
622 bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
623 }
624 return 0;
625}
626
627static QemuOptsList nfs_create_opts = {
628 .name = "nfs-create-opts",
629 .head = QTAILQ_HEAD_INITIALIZER(nfs_create_opts.head),
630 .desc = {
631 {
632 .name = BLOCK_OPT_SIZE,
633 .type = QEMU_OPT_SIZE,
634 .help = "Virtual disk size"
635 },
636 { }
637 }
638};
639
640static int nfs_file_co_create(BlockdevCreateOptions *options, Error **errp)
641{
642 BlockdevCreateOptionsNfs *opts = &options->u.nfs;
643 NFSClient *client = g_new0(NFSClient, 1);
644 int ret;
645
646 assert(options->driver == BLOCKDEV_DRIVER_NFS);
647
648 client->aio_context = qemu_get_aio_context();
649
650 ret = nfs_client_open(client, opts->location, O_CREAT, 0, errp);
651 if (ret < 0) {
652 goto out;
653 }
654 ret = nfs_ftruncate(client->context, client->fh, opts->size);
655 nfs_client_close(client);
656
657out:
658 g_free(client);
659 return ret;
660}
661
662static int coroutine_fn nfs_file_co_create_opts(BlockDriver *drv,
663 const char *url,
664 QemuOpts *opts,
665 Error **errp)
666{
667 BlockdevCreateOptions *create_options;
668 BlockdevCreateOptionsNfs *nfs_opts;
669 QDict *options;
670 int ret;
671
672 create_options = g_new0(BlockdevCreateOptions, 1);
673 create_options->driver = BLOCKDEV_DRIVER_NFS;
674 nfs_opts = &create_options->u.nfs;
675
676
677 nfs_opts->size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
678 BDRV_SECTOR_SIZE);
679
680 options = qdict_new();
681 ret = nfs_parse_uri(url, options, errp);
682 if (ret < 0) {
683 goto out;
684 }
685
686 nfs_opts->location = nfs_options_qdict_to_qapi(options, errp);
687 if (nfs_opts->location == NULL) {
688 ret = -EINVAL;
689 goto out;
690 }
691
692 ret = nfs_file_co_create(create_options, errp);
693 if (ret < 0) {
694 goto out;
695 }
696
697 ret = 0;
698out:
699 qobject_unref(options);
700 qapi_free_BlockdevCreateOptions(create_options);
701 return ret;
702}
703
704static int nfs_has_zero_init(BlockDriverState *bs)
705{
706 NFSClient *client = bs->opaque;
707 return client->has_zero_init;
708}
709
710#if !defined(_WIN32)
711
712static void
713nfs_get_allocated_file_size_cb(int ret, struct nfs_context *nfs, void *data,
714 void *private_data)
715{
716 NFSRPC *task = private_data;
717 task->ret = ret;
718 if (task->ret == 0) {
719 memcpy(task->st, data, sizeof(struct stat));
720 }
721 if (task->ret < 0) {
722 error_report("NFS Error: %s", nfs_get_error(nfs));
723 }
724
725
726 qatomic_mb_set(&task->complete, 1);
727 bdrv_wakeup(task->bs);
728}
729
730static int64_t nfs_get_allocated_file_size(BlockDriverState *bs)
731{
732 NFSClient *client = bs->opaque;
733 NFSRPC task = {0};
734 struct stat st;
735
736 if (bdrv_is_read_only(bs) &&
737 !(bs->open_flags & BDRV_O_NOCACHE)) {
738 return client->st_blocks * 512;
739 }
740
741 task.bs = bs;
742 task.st = &st;
743 if (nfs_fstat_async(client->context, client->fh, nfs_get_allocated_file_size_cb,
744 &task) != 0) {
745 return -ENOMEM;
746 }
747
748 nfs_set_events(client);
749 BDRV_POLL_WHILE(bs, !task.complete);
750
751 return (task.ret < 0 ? task.ret : st.st_blocks * 512);
752}
753#endif
754
755static int coroutine_fn
756nfs_file_co_truncate(BlockDriverState *bs, int64_t offset, bool exact,
757 PreallocMode prealloc, BdrvRequestFlags flags,
758 Error **errp)
759{
760 NFSClient *client = bs->opaque;
761 int ret;
762
763 if (prealloc != PREALLOC_MODE_OFF) {
764 error_setg(errp, "Unsupported preallocation mode '%s'",
765 PreallocMode_str(prealloc));
766 return -ENOTSUP;
767 }
768
769 ret = nfs_ftruncate(client->context, client->fh, offset);
770 if (ret < 0) {
771 error_setg_errno(errp, -ret, "Failed to truncate file");
772 return ret;
773 }
774
775 return 0;
776}
777
778
779
780static int nfs_reopen_prepare(BDRVReopenState *state,
781 BlockReopenQueue *queue, Error **errp)
782{
783 NFSClient *client = state->bs->opaque;
784 struct stat st;
785 int ret = 0;
786
787 if (state->flags & BDRV_O_RDWR && bdrv_is_read_only(state->bs)) {
788 error_setg(errp, "Cannot open a read-only mount as read-write");
789 return -EACCES;
790 }
791
792 if ((state->flags & BDRV_O_NOCACHE) && client->cache_used) {
793 error_setg(errp, "Cannot disable cache if libnfs readahead or"
794 " pagecache is enabled");
795 return -EINVAL;
796 }
797
798
799 if (!(state->flags & BDRV_O_RDWR)) {
800 ret = nfs_fstat(client->context, client->fh, &st);
801 if (ret < 0) {
802 error_setg(errp, "Failed to fstat file: %s",
803 nfs_get_error(client->context));
804 return ret;
805 }
806#if !defined(_WIN32)
807 client->st_blocks = st.st_blocks;
808#endif
809 }
810
811 return 0;
812}
813
814static void nfs_refresh_filename(BlockDriverState *bs)
815{
816 NFSClient *client = bs->opaque;
817
818 if (client->uid && !client->gid) {
819 snprintf(bs->exact_filename, sizeof(bs->exact_filename),
820 "nfs://%s%s?uid=%" PRId64, client->server->host, client->path,
821 client->uid);
822 } else if (!client->uid && client->gid) {
823 snprintf(bs->exact_filename, sizeof(bs->exact_filename),
824 "nfs://%s%s?gid=%" PRId64, client->server->host, client->path,
825 client->gid);
826 } else if (client->uid && client->gid) {
827 snprintf(bs->exact_filename, sizeof(bs->exact_filename),
828 "nfs://%s%s?uid=%" PRId64 "&gid=%" PRId64,
829 client->server->host, client->path, client->uid, client->gid);
830 } else {
831 snprintf(bs->exact_filename, sizeof(bs->exact_filename),
832 "nfs://%s%s", client->server->host, client->path);
833 }
834}
835
836static char *nfs_dirname(BlockDriverState *bs, Error **errp)
837{
838 NFSClient *client = bs->opaque;
839
840 if (client->uid || client->gid) {
841 bdrv_refresh_filename(bs);
842 error_setg(errp, "Cannot generate a base directory for NFS node '%s'",
843 bs->filename);
844 return NULL;
845 }
846
847 return g_strdup_printf("nfs://%s%s/", client->server->host, client->path);
848}
849
850#ifdef LIBNFS_FEATURE_PAGECACHE
851static void coroutine_fn nfs_co_invalidate_cache(BlockDriverState *bs,
852 Error **errp)
853{
854 NFSClient *client = bs->opaque;
855 nfs_pagecache_invalidate(client->context, client->fh);
856}
857#endif
858
859static const char *nfs_strong_runtime_opts[] = {
860 "path",
861 "user",
862 "group",
863 "server.",
864
865 NULL
866};
867
868static BlockDriver bdrv_nfs = {
869 .format_name = "nfs",
870 .protocol_name = "nfs",
871
872 .instance_size = sizeof(NFSClient),
873 .bdrv_parse_filename = nfs_parse_filename,
874 .create_opts = &nfs_create_opts,
875
876 .bdrv_has_zero_init = nfs_has_zero_init,
877
878#if !defined(_WIN32)
879 .bdrv_get_allocated_file_size = nfs_get_allocated_file_size,
880#endif
881 .bdrv_co_truncate = nfs_file_co_truncate,
882
883 .bdrv_file_open = nfs_file_open,
884 .bdrv_close = nfs_file_close,
885 .bdrv_co_create = nfs_file_co_create,
886 .bdrv_co_create_opts = nfs_file_co_create_opts,
887 .bdrv_reopen_prepare = nfs_reopen_prepare,
888
889 .bdrv_co_preadv = nfs_co_preadv,
890 .bdrv_co_pwritev = nfs_co_pwritev,
891 .bdrv_co_flush_to_disk = nfs_co_flush,
892
893 .bdrv_detach_aio_context = nfs_detach_aio_context,
894 .bdrv_attach_aio_context = nfs_attach_aio_context,
895 .bdrv_refresh_filename = nfs_refresh_filename,
896 .bdrv_dirname = nfs_dirname,
897
898 .strong_runtime_opts = nfs_strong_runtime_opts,
899
900#ifdef LIBNFS_FEATURE_PAGECACHE
901 .bdrv_co_invalidate_cache = nfs_co_invalidate_cache,
902#endif
903};
904
905static void nfs_block_init(void)
906{
907 bdrv_register(&bdrv_nfs);
908}
909
910block_init(nfs_block_init);
911