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25#include "qemu/osdep.h"
26
27#include <poll.h>
28#include "qemu/config-file.h"
29#include "qemu/error-report.h"
30#include "qapi/error.h"
31#include "block/block_int.h"
32#include "block/qdict.h"
33#include "trace.h"
34#include "qemu/iov.h"
35#include "qemu/module.h"
36#include "qemu/option.h"
37#include "qemu/uri.h"
38#include "qemu/cutils.h"
39#include "sysemu/sysemu.h"
40#include "qapi/qapi-visit-block-core.h"
41#include "qapi/qmp/qdict.h"
42#include "qapi/qmp/qstring.h"
43#include "qapi/qobject-input-visitor.h"
44#include "qapi/qobject-output-visitor.h"
45#include <nfsc/libnfs.h>
46
47
48#define QEMU_NFS_MAX_READAHEAD_SIZE 1048576
49#define QEMU_NFS_MAX_PAGECACHE_SIZE (8388608 / NFS_BLKSIZE)
50#define QEMU_NFS_MAX_DEBUG_LEVEL 2
51
52typedef struct NFSClient {
53 struct nfs_context *context;
54 struct nfsfh *fh;
55 int events;
56 bool has_zero_init;
57 AioContext *aio_context;
58 QemuMutex mutex;
59 blkcnt_t st_blocks;
60 bool cache_used;
61 NFSServer *server;
62 char *path;
63 int64_t uid, gid, tcp_syncnt, readahead, pagecache, debug;
64} NFSClient;
65
66typedef struct NFSRPC {
67 BlockDriverState *bs;
68 int ret;
69 int complete;
70 QEMUIOVector *iov;
71 struct stat *st;
72 Coroutine *co;
73 NFSClient *client;
74} NFSRPC;
75
76static int nfs_parse_uri(const char *filename, QDict *options, Error **errp)
77{
78 URI *uri = NULL;
79 QueryParams *qp = NULL;
80 int ret = -EINVAL, i;
81
82 uri = uri_parse(filename);
83 if (!uri) {
84 error_setg(errp, "Invalid URI specified");
85 goto out;
86 }
87 if (g_strcmp0(uri->scheme, "nfs") != 0) {
88 error_setg(errp, "URI scheme must be 'nfs'");
89 goto out;
90 }
91
92 if (!uri->server) {
93 error_setg(errp, "missing hostname in URI");
94 goto out;
95 }
96
97 if (!uri->path) {
98 error_setg(errp, "missing file path in URI");
99 goto out;
100 }
101
102 qp = query_params_parse(uri->query);
103 if (!qp) {
104 error_setg(errp, "could not parse query parameters");
105 goto out;
106 }
107
108 qdict_put_str(options, "server.host", uri->server);
109 qdict_put_str(options, "server.type", "inet");
110 qdict_put_str(options, "path", uri->path);
111
112 for (i = 0; i < qp->n; i++) {
113 unsigned long long val;
114 if (!qp->p[i].value) {
115 error_setg(errp, "Value for NFS parameter expected: %s",
116 qp->p[i].name);
117 goto out;
118 }
119 if (parse_uint_full(qp->p[i].value, &val, 0)) {
120 error_setg(errp, "Illegal value for NFS parameter: %s",
121 qp->p[i].name);
122 goto out;
123 }
124 if (!strcmp(qp->p[i].name, "uid")) {
125 qdict_put_str(options, "user", qp->p[i].value);
126 } else if (!strcmp(qp->p[i].name, "gid")) {
127 qdict_put_str(options, "group", qp->p[i].value);
128 } else if (!strcmp(qp->p[i].name, "tcp-syncnt")) {
129 qdict_put_str(options, "tcp-syn-count", qp->p[i].value);
130 } else if (!strcmp(qp->p[i].name, "readahead")) {
131 qdict_put_str(options, "readahead-size", qp->p[i].value);
132 } else if (!strcmp(qp->p[i].name, "pagecache")) {
133 qdict_put_str(options, "page-cache-size", qp->p[i].value);
134 } else if (!strcmp(qp->p[i].name, "debug")) {
135 qdict_put_str(options, "debug", qp->p[i].value);
136 } else {
137 error_setg(errp, "Unknown NFS parameter name: %s",
138 qp->p[i].name);
139 goto out;
140 }
141 }
142 ret = 0;
143out:
144 if (qp) {
145 query_params_free(qp);
146 }
147 if (uri) {
148 uri_free(uri);
149 }
150 return ret;
151}
152
153static bool nfs_has_filename_options_conflict(QDict *options, Error **errp)
154{
155 const QDictEntry *qe;
156
157 for (qe = qdict_first(options); qe; qe = qdict_next(options, qe)) {
158 if (!strcmp(qe->key, "host") ||
159 !strcmp(qe->key, "path") ||
160 !strcmp(qe->key, "user") ||
161 !strcmp(qe->key, "group") ||
162 !strcmp(qe->key, "tcp-syn-count") ||
163 !strcmp(qe->key, "readahead-size") ||
164 !strcmp(qe->key, "page-cache-size") ||
165 !strcmp(qe->key, "debug") ||
166 strstart(qe->key, "server.", NULL))
167 {
168 error_setg(errp, "Option %s cannot be used with a filename",
169 qe->key);
170 return true;
171 }
172 }
173
174 return false;
175}
176
177static void nfs_parse_filename(const char *filename, QDict *options,
178 Error **errp)
179{
180 if (nfs_has_filename_options_conflict(options, errp)) {
181 return;
182 }
183
184 nfs_parse_uri(filename, options, errp);
185}
186
187static void nfs_process_read(void *arg);
188static void nfs_process_write(void *arg);
189
190
191static void nfs_set_events(NFSClient *client)
192{
193 int ev = nfs_which_events(client->context);
194 if (ev != client->events) {
195 aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
196 false,
197 (ev & POLLIN) ? nfs_process_read : NULL,
198 (ev & POLLOUT) ? nfs_process_write : NULL,
199 NULL, client);
200
201 }
202 client->events = ev;
203}
204
205static void nfs_process_read(void *arg)
206{
207 NFSClient *client = arg;
208
209 qemu_mutex_lock(&client->mutex);
210 nfs_service(client->context, POLLIN);
211 nfs_set_events(client);
212 qemu_mutex_unlock(&client->mutex);
213}
214
215static void nfs_process_write(void *arg)
216{
217 NFSClient *client = arg;
218
219 qemu_mutex_lock(&client->mutex);
220 nfs_service(client->context, POLLOUT);
221 nfs_set_events(client);
222 qemu_mutex_unlock(&client->mutex);
223}
224
225static void nfs_co_init_task(BlockDriverState *bs, NFSRPC *task)
226{
227 *task = (NFSRPC) {
228 .co = qemu_coroutine_self(),
229 .bs = bs,
230 .client = bs->opaque,
231 };
232}
233
234static void nfs_co_generic_bh_cb(void *opaque)
235{
236 NFSRPC *task = opaque;
237
238 task->complete = 1;
239 aio_co_wake(task->co);
240}
241
242
243static void
244nfs_co_generic_cb(int ret, struct nfs_context *nfs, void *data,
245 void *private_data)
246{
247 NFSRPC *task = private_data;
248 task->ret = ret;
249 assert(!task->st);
250 if (task->ret > 0 && task->iov) {
251 if (task->ret <= task->iov->size) {
252 qemu_iovec_from_buf(task->iov, 0, data, task->ret);
253 } else {
254 task->ret = -EIO;
255 }
256 }
257 if (task->ret < 0) {
258 error_report("NFS Error: %s", nfs_get_error(nfs));
259 }
260 aio_bh_schedule_oneshot(task->client->aio_context,
261 nfs_co_generic_bh_cb, task);
262}
263
264static int coroutine_fn nfs_co_preadv(BlockDriverState *bs, uint64_t offset,
265 uint64_t bytes, QEMUIOVector *iov,
266 int flags)
267{
268 NFSClient *client = bs->opaque;
269 NFSRPC task;
270
271 nfs_co_init_task(bs, &task);
272 task.iov = iov;
273
274 qemu_mutex_lock(&client->mutex);
275 if (nfs_pread_async(client->context, client->fh,
276 offset, bytes, nfs_co_generic_cb, &task) != 0) {
277 qemu_mutex_unlock(&client->mutex);
278 return -ENOMEM;
279 }
280
281 nfs_set_events(client);
282 qemu_mutex_unlock(&client->mutex);
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, uint64_t offset,
300 uint64_t bytes, QEMUIOVector *iov,
301 int 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 qemu_mutex_lock(&client->mutex);
322 if (nfs_pwrite_async(client->context, client->fh,
323 offset, bytes, buf,
324 nfs_co_generic_cb, &task) != 0) {
325 qemu_mutex_unlock(&client->mutex);
326 if (my_buffer) {
327 g_free(buf);
328 }
329 return -ENOMEM;
330 }
331
332 nfs_set_events(client);
333 qemu_mutex_unlock(&client->mutex);
334 while (!task.complete) {
335 qemu_coroutine_yield();
336 }
337
338 if (my_buffer) {
339 g_free(buf);
340 }
341
342 if (task.ret != bytes) {
343 return task.ret < 0 ? task.ret : -EIO;
344 }
345
346 return 0;
347}
348
349static int coroutine_fn nfs_co_flush(BlockDriverState *bs)
350{
351 NFSClient *client = bs->opaque;
352 NFSRPC task;
353
354 nfs_co_init_task(bs, &task);
355
356 qemu_mutex_lock(&client->mutex);
357 if (nfs_fsync_async(client->context, client->fh, nfs_co_generic_cb,
358 &task) != 0) {
359 qemu_mutex_unlock(&client->mutex);
360 return -ENOMEM;
361 }
362
363 nfs_set_events(client);
364 qemu_mutex_unlock(&client->mutex);
365 while (!task.complete) {
366 qemu_coroutine_yield();
367 }
368
369 return task.ret;
370}
371
372static void nfs_detach_aio_context(BlockDriverState *bs)
373{
374 NFSClient *client = bs->opaque;
375
376 aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
377 false, NULL, NULL, NULL, NULL);
378 client->events = 0;
379}
380
381static void nfs_attach_aio_context(BlockDriverState *bs,
382 AioContext *new_context)
383{
384 NFSClient *client = bs->opaque;
385
386 client->aio_context = new_context;
387 nfs_set_events(client);
388}
389
390static void nfs_client_close(NFSClient *client)
391{
392 if (client->context) {
393 qemu_mutex_lock(&client->mutex);
394 aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
395 false, NULL, NULL, NULL, NULL);
396 qemu_mutex_unlock(&client->mutex);
397 if (client->fh) {
398 nfs_close(client->context, client->fh);
399 client->fh = NULL;
400 }
401 nfs_destroy_context(client->context);
402 client->context = NULL;
403 }
404 g_free(client->path);
405 qemu_mutex_destroy(&client->mutex);
406 qapi_free_NFSServer(client->server);
407 client->server = NULL;
408}
409
410static void nfs_file_close(BlockDriverState *bs)
411{
412 NFSClient *client = bs->opaque;
413 nfs_client_close(client);
414}
415
416static int64_t nfs_client_open(NFSClient *client, BlockdevOptionsNfs *opts,
417 int flags, int open_flags, Error **errp)
418{
419 int64_t ret = -EINVAL;
420 struct stat st;
421 char *file = NULL, *strp = NULL;
422
423 qemu_mutex_init(&client->mutex);
424
425 client->path = g_strdup(opts->path);
426
427 strp = strrchr(client->path, '/');
428 if (strp == NULL) {
429 error_setg(errp, "Invalid URL specified");
430 goto fail;
431 }
432 file = g_strdup(strp);
433 *strp = 0;
434
435
436
437 client->server = opts->server;
438 opts->server = NULL;
439
440 client->context = nfs_init_context();
441 if (client->context == NULL) {
442 error_setg(errp, "Failed to init NFS context");
443 goto fail;
444 }
445
446 if (opts->has_user) {
447 client->uid = opts->user;
448 nfs_set_uid(client->context, client->uid);
449 }
450
451 if (opts->has_group) {
452 client->gid = opts->group;
453 nfs_set_gid(client->context, client->gid);
454 }
455
456 if (opts->has_tcp_syn_count) {
457 client->tcp_syncnt = opts->tcp_syn_count;
458 nfs_set_tcp_syncnt(client->context, client->tcp_syncnt);
459 }
460
461#ifdef LIBNFS_FEATURE_READAHEAD
462 if (opts->has_readahead_size) {
463 if (open_flags & BDRV_O_NOCACHE) {
464 error_setg(errp, "Cannot enable NFS readahead "
465 "if cache.direct = on");
466 goto fail;
467 }
468 client->readahead = opts->readahead_size;
469 if (client->readahead > QEMU_NFS_MAX_READAHEAD_SIZE) {
470 warn_report("Truncating NFS readahead size to %d",
471 QEMU_NFS_MAX_READAHEAD_SIZE);
472 client->readahead = QEMU_NFS_MAX_READAHEAD_SIZE;
473 }
474 nfs_set_readahead(client->context, client->readahead);
475#ifdef LIBNFS_FEATURE_PAGECACHE
476 nfs_set_pagecache_ttl(client->context, 0);
477#endif
478 client->cache_used = true;
479 }
480#endif
481
482#ifdef LIBNFS_FEATURE_PAGECACHE
483 if (opts->has_page_cache_size) {
484 if (open_flags & BDRV_O_NOCACHE) {
485 error_setg(errp, "Cannot enable NFS pagecache "
486 "if cache.direct = on");
487 goto fail;
488 }
489 client->pagecache = opts->page_cache_size;
490 if (client->pagecache > QEMU_NFS_MAX_PAGECACHE_SIZE) {
491 warn_report("Truncating NFS pagecache size to %d pages",
492 QEMU_NFS_MAX_PAGECACHE_SIZE);
493 client->pagecache = QEMU_NFS_MAX_PAGECACHE_SIZE;
494 }
495 nfs_set_pagecache(client->context, client->pagecache);
496 nfs_set_pagecache_ttl(client->context, 0);
497 client->cache_used = true;
498 }
499#endif
500
501#ifdef LIBNFS_FEATURE_DEBUG
502 if (opts->has_debug) {
503 client->debug = opts->debug;
504
505
506 if (client->debug > QEMU_NFS_MAX_DEBUG_LEVEL) {
507 warn_report("Limiting NFS debug level to %d",
508 QEMU_NFS_MAX_DEBUG_LEVEL);
509 client->debug = QEMU_NFS_MAX_DEBUG_LEVEL;
510 }
511 nfs_set_debug(client->context, client->debug);
512 }
513#endif
514
515 ret = nfs_mount(client->context, client->server->host, client->path);
516 if (ret < 0) {
517 error_setg(errp, "Failed to mount nfs share: %s",
518 nfs_get_error(client->context));
519 goto fail;
520 }
521
522 if (flags & O_CREAT) {
523 ret = nfs_creat(client->context, file, 0600, &client->fh);
524 if (ret < 0) {
525 error_setg(errp, "Failed to create file: %s",
526 nfs_get_error(client->context));
527 goto fail;
528 }
529 } else {
530 ret = nfs_open(client->context, file, flags, &client->fh);
531 if (ret < 0) {
532 error_setg(errp, "Failed to open file : %s",
533 nfs_get_error(client->context));
534 goto fail;
535 }
536 }
537
538 ret = nfs_fstat(client->context, client->fh, &st);
539 if (ret < 0) {
540 error_setg(errp, "Failed to fstat file: %s",
541 nfs_get_error(client->context));
542 goto fail;
543 }
544
545 ret = DIV_ROUND_UP(st.st_size, BDRV_SECTOR_SIZE);
546 client->st_blocks = st.st_blocks;
547 client->has_zero_init = S_ISREG(st.st_mode);
548 *strp = '/';
549 goto out;
550
551fail:
552 nfs_client_close(client);
553out:
554 g_free(file);
555 return ret;
556}
557
558static BlockdevOptionsNfs *nfs_options_qdict_to_qapi(QDict *options,
559 Error **errp)
560{
561 BlockdevOptionsNfs *opts = NULL;
562 Visitor *v;
563 const QDictEntry *e;
564 Error *local_err = NULL;
565
566 v = qobject_input_visitor_new_flat_confused(options, errp);
567 if (!v) {
568 return NULL;
569 }
570
571 visit_type_BlockdevOptionsNfs(v, NULL, &opts, &local_err);
572 visit_free(v);
573
574 if (local_err) {
575 error_propagate(errp, local_err);
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 int 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 ret = 0;
622 return ret;
623}
624
625static QemuOptsList nfs_create_opts = {
626 .name = "nfs-create-opts",
627 .head = QTAILQ_HEAD_INITIALIZER(nfs_create_opts.head),
628 .desc = {
629 {
630 .name = BLOCK_OPT_SIZE,
631 .type = QEMU_OPT_SIZE,
632 .help = "Virtual disk size"
633 },
634 { }
635 }
636};
637
638static int nfs_file_co_create(BlockdevCreateOptions *options, Error **errp)
639{
640 BlockdevCreateOptionsNfs *opts = &options->u.nfs;
641 NFSClient *client = g_new0(NFSClient, 1);
642 int ret;
643
644 assert(options->driver == BLOCKDEV_DRIVER_NFS);
645
646 client->aio_context = qemu_get_aio_context();
647
648 ret = nfs_client_open(client, opts->location, O_CREAT, 0, errp);
649 if (ret < 0) {
650 goto out;
651 }
652 ret = nfs_ftruncate(client->context, client->fh, opts->size);
653 nfs_client_close(client);
654
655out:
656 g_free(client);
657 return ret;
658}
659
660static int coroutine_fn nfs_file_co_create_opts(const char *url, QemuOpts *opts,
661 Error **errp)
662{
663 BlockdevCreateOptions *create_options;
664 BlockdevCreateOptionsNfs *nfs_opts;
665 QDict *options;
666 int ret;
667
668 create_options = g_new0(BlockdevCreateOptions, 1);
669 create_options->driver = BLOCKDEV_DRIVER_NFS;
670 nfs_opts = &create_options->u.nfs;
671
672
673 nfs_opts->size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
674 BDRV_SECTOR_SIZE);
675
676 options = qdict_new();
677 ret = nfs_parse_uri(url, options, errp);
678 if (ret < 0) {
679 goto out;
680 }
681
682 nfs_opts->location = nfs_options_qdict_to_qapi(options, errp);
683 if (nfs_opts->location == NULL) {
684 ret = -EINVAL;
685 goto out;
686 }
687
688 ret = nfs_file_co_create(create_options, errp);
689 if (ret < 0) {
690 goto out;
691 }
692
693 ret = 0;
694out:
695 qobject_unref(options);
696 qapi_free_BlockdevCreateOptions(create_options);
697 return ret;
698}
699
700static int nfs_has_zero_init(BlockDriverState *bs)
701{
702 NFSClient *client = bs->opaque;
703 return client->has_zero_init;
704}
705
706
707static void
708nfs_get_allocated_file_size_cb(int ret, struct nfs_context *nfs, void *data,
709 void *private_data)
710{
711 NFSRPC *task = private_data;
712 task->ret = ret;
713 if (task->ret == 0) {
714 memcpy(task->st, data, sizeof(struct stat));
715 }
716 if (task->ret < 0) {
717 error_report("NFS Error: %s", nfs_get_error(nfs));
718 }
719
720
721 atomic_mb_set(&task->complete, 1);
722 bdrv_wakeup(task->bs);
723}
724
725static int64_t nfs_get_allocated_file_size(BlockDriverState *bs)
726{
727 NFSClient *client = bs->opaque;
728 NFSRPC task = {0};
729 struct stat st;
730
731 if (bdrv_is_read_only(bs) &&
732 !(bs->open_flags & BDRV_O_NOCACHE)) {
733 return client->st_blocks * 512;
734 }
735
736 task.bs = bs;
737 task.st = &st;
738 if (nfs_fstat_async(client->context, client->fh, nfs_get_allocated_file_size_cb,
739 &task) != 0) {
740 return -ENOMEM;
741 }
742
743 nfs_set_events(client);
744 BDRV_POLL_WHILE(bs, !task.complete);
745
746 return (task.ret < 0 ? task.ret : st.st_blocks * 512);
747}
748
749static int coroutine_fn
750nfs_file_co_truncate(BlockDriverState *bs, int64_t offset,
751 PreallocMode prealloc, Error **errp)
752{
753 NFSClient *client = bs->opaque;
754 int ret;
755
756 if (prealloc != PREALLOC_MODE_OFF) {
757 error_setg(errp, "Unsupported preallocation mode '%s'",
758 PreallocMode_str(prealloc));
759 return -ENOTSUP;
760 }
761
762 ret = nfs_ftruncate(client->context, client->fh, offset);
763 if (ret < 0) {
764 error_setg_errno(errp, -ret, "Failed to truncate file");
765 return ret;
766 }
767
768 return 0;
769}
770
771
772
773static int nfs_reopen_prepare(BDRVReopenState *state,
774 BlockReopenQueue *queue, Error **errp)
775{
776 NFSClient *client = state->bs->opaque;
777 struct stat st;
778 int ret = 0;
779
780 if (state->flags & BDRV_O_RDWR && bdrv_is_read_only(state->bs)) {
781 error_setg(errp, "Cannot open a read-only mount as read-write");
782 return -EACCES;
783 }
784
785 if ((state->flags & BDRV_O_NOCACHE) && client->cache_used) {
786 error_setg(errp, "Cannot disable cache if libnfs readahead or"
787 " pagecache is enabled");
788 return -EINVAL;
789 }
790
791
792 if (!(state->flags & BDRV_O_RDWR)) {
793 ret = nfs_fstat(client->context, client->fh, &st);
794 if (ret < 0) {
795 error_setg(errp, "Failed to fstat file: %s",
796 nfs_get_error(client->context));
797 return ret;
798 }
799 client->st_blocks = st.st_blocks;
800 }
801
802 return 0;
803}
804
805static void nfs_refresh_filename(BlockDriverState *bs)
806{
807 NFSClient *client = bs->opaque;
808
809 if (client->uid && !client->gid) {
810 snprintf(bs->exact_filename, sizeof(bs->exact_filename),
811 "nfs://%s%s?uid=%" PRId64, client->server->host, client->path,
812 client->uid);
813 } else if (!client->uid && client->gid) {
814 snprintf(bs->exact_filename, sizeof(bs->exact_filename),
815 "nfs://%s%s?gid=%" PRId64, client->server->host, client->path,
816 client->gid);
817 } else if (client->uid && client->gid) {
818 snprintf(bs->exact_filename, sizeof(bs->exact_filename),
819 "nfs://%s%s?uid=%" PRId64 "&gid=%" PRId64,
820 client->server->host, client->path, client->uid, client->gid);
821 } else {
822 snprintf(bs->exact_filename, sizeof(bs->exact_filename),
823 "nfs://%s%s", client->server->host, client->path);
824 }
825}
826
827static char *nfs_dirname(BlockDriverState *bs, Error **errp)
828{
829 NFSClient *client = bs->opaque;
830
831 if (client->uid || client->gid) {
832 bdrv_refresh_filename(bs);
833 error_setg(errp, "Cannot generate a base directory for NFS node '%s'",
834 bs->filename);
835 return NULL;
836 }
837
838 return g_strdup_printf("nfs://%s%s/", client->server->host, client->path);
839}
840
841#ifdef LIBNFS_FEATURE_PAGECACHE
842static void coroutine_fn nfs_co_invalidate_cache(BlockDriverState *bs,
843 Error **errp)
844{
845 NFSClient *client = bs->opaque;
846 nfs_pagecache_invalidate(client->context, client->fh);
847}
848#endif
849
850static const char *nfs_strong_runtime_opts[] = {
851 "path",
852 "user",
853 "group",
854 "server.",
855
856 NULL
857};
858
859static BlockDriver bdrv_nfs = {
860 .format_name = "nfs",
861 .protocol_name = "nfs",
862
863 .instance_size = sizeof(NFSClient),
864 .bdrv_parse_filename = nfs_parse_filename,
865 .create_opts = &nfs_create_opts,
866
867 .bdrv_has_zero_init = nfs_has_zero_init,
868 .bdrv_get_allocated_file_size = nfs_get_allocated_file_size,
869 .bdrv_co_truncate = nfs_file_co_truncate,
870
871 .bdrv_file_open = nfs_file_open,
872 .bdrv_close = nfs_file_close,
873 .bdrv_co_create = nfs_file_co_create,
874 .bdrv_co_create_opts = nfs_file_co_create_opts,
875 .bdrv_reopen_prepare = nfs_reopen_prepare,
876
877 .bdrv_co_preadv = nfs_co_preadv,
878 .bdrv_co_pwritev = nfs_co_pwritev,
879 .bdrv_co_flush_to_disk = nfs_co_flush,
880
881 .bdrv_detach_aio_context = nfs_detach_aio_context,
882 .bdrv_attach_aio_context = nfs_attach_aio_context,
883 .bdrv_refresh_filename = nfs_refresh_filename,
884 .bdrv_dirname = nfs_dirname,
885
886 .strong_runtime_opts = nfs_strong_runtime_opts,
887
888#ifdef LIBNFS_FEATURE_PAGECACHE
889 .bdrv_co_invalidate_cache = nfs_co_invalidate_cache,
890#endif
891};
892
893static void nfs_block_init(void)
894{
895 bdrv_register(&bdrv_nfs);
896}
897
898block_init(nfs_block_init);
899