block: honor BDRV_O_ALLOW_RDWR when clearing bs->read_only
[qemu.git] / block / gluster.c
1 /*
2 * GlusterFS backend for QEMU
3 *
4 * Copyright (C) 2012 Bharata B Rao <bharata@linux.vnet.ibm.com>
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
7 * See the COPYING file in the top-level directory.
8 *
9 */
10 #include "qemu/osdep.h"
11 #include <glusterfs/api/glfs.h>
12 #include "block/block_int.h"
13 #include "qapi/error.h"
14 #include "qapi/qmp/qerror.h"
15 #include "qapi/util.h"
16 #include "qemu/uri.h"
17 #include "qemu/error-report.h"
18 #include "qemu/cutils.h"
19
20 #define GLUSTER_OPT_FILENAME "filename"
21 #define GLUSTER_OPT_VOLUME "volume"
22 #define GLUSTER_OPT_PATH "path"
23 #define GLUSTER_OPT_TYPE "type"
24 #define GLUSTER_OPT_SERVER_PATTERN "server."
25 #define GLUSTER_OPT_HOST "host"
26 #define GLUSTER_OPT_PORT "port"
27 #define GLUSTER_OPT_TO "to"
28 #define GLUSTER_OPT_IPV4 "ipv4"
29 #define GLUSTER_OPT_IPV6 "ipv6"
30 #define GLUSTER_OPT_SOCKET "socket"
31 #define GLUSTER_OPT_DEBUG "debug"
32 #define GLUSTER_DEFAULT_PORT 24007
33 #define GLUSTER_DEBUG_DEFAULT 4
34 #define GLUSTER_DEBUG_MAX 9
35 #define GLUSTER_OPT_LOGFILE "logfile"
36 #define GLUSTER_LOGFILE_DEFAULT "-" /* handled in libgfapi as /dev/stderr */
37
38 #define GERR_INDEX_HINT "hint: check in 'server' array index '%d'\n"
39
40 typedef struct GlusterAIOCB {
41 int64_t size;
42 int ret;
43 Coroutine *coroutine;
44 AioContext *aio_context;
45 } GlusterAIOCB;
46
47 typedef struct BDRVGlusterState {
48 struct glfs *glfs;
49 struct glfs_fd *fd;
50 char *logfile;
51 bool supports_seek_data;
52 int debug;
53 } BDRVGlusterState;
54
55 typedef struct BDRVGlusterReopenState {
56 struct glfs *glfs;
57 struct glfs_fd *fd;
58 } BDRVGlusterReopenState;
59
60
61 typedef struct GlfsPreopened {
62 char *volume;
63 glfs_t *fs;
64 int ref;
65 } GlfsPreopened;
66
67 typedef struct ListElement {
68 QLIST_ENTRY(ListElement) list;
69 GlfsPreopened saved;
70 } ListElement;
71
72 static QLIST_HEAD(glfs_list, ListElement) glfs_list;
73
74 static QemuOptsList qemu_gluster_create_opts = {
75 .name = "qemu-gluster-create-opts",
76 .head = QTAILQ_HEAD_INITIALIZER(qemu_gluster_create_opts.head),
77 .desc = {
78 {
79 .name = BLOCK_OPT_SIZE,
80 .type = QEMU_OPT_SIZE,
81 .help = "Virtual disk size"
82 },
83 {
84 .name = BLOCK_OPT_PREALLOC,
85 .type = QEMU_OPT_STRING,
86 .help = "Preallocation mode (allowed values: off, full)"
87 },
88 {
89 .name = GLUSTER_OPT_DEBUG,
90 .type = QEMU_OPT_NUMBER,
91 .help = "Gluster log level, valid range is 0-9",
92 },
93 {
94 .name = GLUSTER_OPT_LOGFILE,
95 .type = QEMU_OPT_STRING,
96 .help = "Logfile path of libgfapi",
97 },
98 { /* end of list */ }
99 }
100 };
101
102 static QemuOptsList runtime_opts = {
103 .name = "gluster",
104 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
105 .desc = {
106 {
107 .name = GLUSTER_OPT_FILENAME,
108 .type = QEMU_OPT_STRING,
109 .help = "URL to the gluster image",
110 },
111 {
112 .name = GLUSTER_OPT_DEBUG,
113 .type = QEMU_OPT_NUMBER,
114 .help = "Gluster log level, valid range is 0-9",
115 },
116 {
117 .name = GLUSTER_OPT_LOGFILE,
118 .type = QEMU_OPT_STRING,
119 .help = "Logfile path of libgfapi",
120 },
121 { /* end of list */ }
122 },
123 };
124
125 static QemuOptsList runtime_json_opts = {
126 .name = "gluster_json",
127 .head = QTAILQ_HEAD_INITIALIZER(runtime_json_opts.head),
128 .desc = {
129 {
130 .name = GLUSTER_OPT_VOLUME,
131 .type = QEMU_OPT_STRING,
132 .help = "name of gluster volume where VM image resides",
133 },
134 {
135 .name = GLUSTER_OPT_PATH,
136 .type = QEMU_OPT_STRING,
137 .help = "absolute path to image file in gluster volume",
138 },
139 {
140 .name = GLUSTER_OPT_DEBUG,
141 .type = QEMU_OPT_NUMBER,
142 .help = "Gluster log level, valid range is 0-9",
143 },
144 { /* end of list */ }
145 },
146 };
147
148 static QemuOptsList runtime_type_opts = {
149 .name = "gluster_type",
150 .head = QTAILQ_HEAD_INITIALIZER(runtime_type_opts.head),
151 .desc = {
152 {
153 .name = GLUSTER_OPT_TYPE,
154 .type = QEMU_OPT_STRING,
155 .help = "inet|unix",
156 },
157 { /* end of list */ }
158 },
159 };
160
161 static QemuOptsList runtime_unix_opts = {
162 .name = "gluster_unix",
163 .head = QTAILQ_HEAD_INITIALIZER(runtime_unix_opts.head),
164 .desc = {
165 {
166 .name = GLUSTER_OPT_SOCKET,
167 .type = QEMU_OPT_STRING,
168 .help = "socket file path)",
169 },
170 { /* end of list */ }
171 },
172 };
173
174 static QemuOptsList runtime_inet_opts = {
175 .name = "gluster_inet",
176 .head = QTAILQ_HEAD_INITIALIZER(runtime_inet_opts.head),
177 .desc = {
178 {
179 .name = GLUSTER_OPT_TYPE,
180 .type = QEMU_OPT_STRING,
181 .help = "inet|unix",
182 },
183 {
184 .name = GLUSTER_OPT_HOST,
185 .type = QEMU_OPT_STRING,
186 .help = "host address (hostname/ipv4/ipv6 addresses)",
187 },
188 {
189 .name = GLUSTER_OPT_PORT,
190 .type = QEMU_OPT_STRING,
191 .help = "port number on which glusterd is listening (default 24007)",
192 },
193 {
194 .name = "to",
195 .type = QEMU_OPT_NUMBER,
196 .help = "max port number, not supported by gluster",
197 },
198 {
199 .name = "ipv4",
200 .type = QEMU_OPT_BOOL,
201 .help = "ipv4 bool value, not supported by gluster",
202 },
203 {
204 .name = "ipv6",
205 .type = QEMU_OPT_BOOL,
206 .help = "ipv6 bool value, not supported by gluster",
207 },
208 { /* end of list */ }
209 },
210 };
211
212 static void glfs_set_preopened(const char *volume, glfs_t *fs)
213 {
214 ListElement *entry = NULL;
215
216 entry = g_new(ListElement, 1);
217
218 entry->saved.volume = g_strdup(volume);
219
220 entry->saved.fs = fs;
221 entry->saved.ref = 1;
222
223 QLIST_INSERT_HEAD(&glfs_list, entry, list);
224 }
225
226 static glfs_t *glfs_find_preopened(const char *volume)
227 {
228 ListElement *entry = NULL;
229
230 QLIST_FOREACH(entry, &glfs_list, list) {
231 if (strcmp(entry->saved.volume, volume) == 0) {
232 entry->saved.ref++;
233 return entry->saved.fs;
234 }
235 }
236
237 return NULL;
238 }
239
240 static void glfs_clear_preopened(glfs_t *fs)
241 {
242 ListElement *entry = NULL;
243 ListElement *next;
244
245 if (fs == NULL) {
246 return;
247 }
248
249 QLIST_FOREACH_SAFE(entry, &glfs_list, list, next) {
250 if (entry->saved.fs == fs) {
251 if (--entry->saved.ref) {
252 return;
253 }
254
255 QLIST_REMOVE(entry, list);
256
257 glfs_fini(entry->saved.fs);
258 g_free(entry->saved.volume);
259 g_free(entry);
260 }
261 }
262 }
263
264 static int parse_volume_options(BlockdevOptionsGluster *gconf, char *path)
265 {
266 char *p, *q;
267
268 if (!path) {
269 return -EINVAL;
270 }
271
272 /* volume */
273 p = q = path + strspn(path, "/");
274 p += strcspn(p, "/");
275 if (*p == '\0') {
276 return -EINVAL;
277 }
278 gconf->volume = g_strndup(q, p - q);
279
280 /* path */
281 p += strspn(p, "/");
282 if (*p == '\0') {
283 return -EINVAL;
284 }
285 gconf->path = g_strdup(p);
286 return 0;
287 }
288
289 /*
290 * file=gluster[+transport]://[host[:port]]/volume/path[?socket=...]
291 *
292 * 'gluster' is the protocol.
293 *
294 * 'transport' specifies the transport type used to connect to gluster
295 * management daemon (glusterd). Valid transport types are
296 * tcp or unix. If a transport type isn't specified, then tcp type is assumed.
297 *
298 * 'host' specifies the host where the volume file specification for
299 * the given volume resides. This can be either hostname or ipv4 address.
300 * If transport type is 'unix', then 'host' field should not be specified.
301 * The 'socket' field needs to be populated with the path to unix domain
302 * socket.
303 *
304 * 'port' is the port number on which glusterd is listening. This is optional
305 * and if not specified, QEMU will send 0 which will make gluster to use the
306 * default port. If the transport type is unix, then 'port' should not be
307 * specified.
308 *
309 * 'volume' is the name of the gluster volume which contains the VM image.
310 *
311 * 'path' is the path to the actual VM image that resides on gluster volume.
312 *
313 * Examples:
314 *
315 * file=gluster://1.2.3.4/testvol/a.img
316 * file=gluster+tcp://1.2.3.4/testvol/a.img
317 * file=gluster+tcp://1.2.3.4:24007/testvol/dir/a.img
318 * file=gluster+tcp://host.domain.com:24007/testvol/dir/a.img
319 * file=gluster+unix:///testvol/dir/a.img?socket=/tmp/glusterd.socket
320 */
321 static int qemu_gluster_parse_uri(BlockdevOptionsGluster *gconf,
322 const char *filename)
323 {
324 SocketAddressFlat *gsconf;
325 URI *uri;
326 QueryParams *qp = NULL;
327 bool is_unix = false;
328 int ret = 0;
329
330 uri = uri_parse(filename);
331 if (!uri) {
332 return -EINVAL;
333 }
334
335 gconf->server = g_new0(SocketAddressFlatList, 1);
336 gconf->server->value = gsconf = g_new0(SocketAddressFlat, 1);
337
338 /* transport */
339 if (!uri->scheme || !strcmp(uri->scheme, "gluster")) {
340 gsconf->type = SOCKET_ADDRESS_FLAT_TYPE_INET;
341 } else if (!strcmp(uri->scheme, "gluster+tcp")) {
342 gsconf->type = SOCKET_ADDRESS_FLAT_TYPE_INET;
343 } else if (!strcmp(uri->scheme, "gluster+unix")) {
344 gsconf->type = SOCKET_ADDRESS_FLAT_TYPE_UNIX;
345 is_unix = true;
346 } else if (!strcmp(uri->scheme, "gluster+rdma")) {
347 gsconf->type = SOCKET_ADDRESS_FLAT_TYPE_INET;
348 error_report("Warning: rdma feature is not supported, falling "
349 "back to tcp");
350 } else {
351 ret = -EINVAL;
352 goto out;
353 }
354
355 ret = parse_volume_options(gconf, uri->path);
356 if (ret < 0) {
357 goto out;
358 }
359
360 qp = query_params_parse(uri->query);
361 if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) {
362 ret = -EINVAL;
363 goto out;
364 }
365
366 if (is_unix) {
367 if (uri->server || uri->port) {
368 ret = -EINVAL;
369 goto out;
370 }
371 if (strcmp(qp->p[0].name, "socket")) {
372 ret = -EINVAL;
373 goto out;
374 }
375 gsconf->u.q_unix.path = g_strdup(qp->p[0].value);
376 } else {
377 gsconf->u.inet.host = g_strdup(uri->server ? uri->server : "localhost");
378 if (uri->port) {
379 gsconf->u.inet.port = g_strdup_printf("%d", uri->port);
380 } else {
381 gsconf->u.inet.port = g_strdup_printf("%d", GLUSTER_DEFAULT_PORT);
382 }
383 }
384
385 out:
386 if (qp) {
387 query_params_free(qp);
388 }
389 uri_free(uri);
390 return ret;
391 }
392
393 static struct glfs *qemu_gluster_glfs_init(BlockdevOptionsGluster *gconf,
394 Error **errp)
395 {
396 struct glfs *glfs;
397 int ret;
398 int old_errno;
399 SocketAddressFlatList *server;
400 unsigned long long port;
401
402 glfs = glfs_find_preopened(gconf->volume);
403 if (glfs) {
404 return glfs;
405 }
406
407 glfs = glfs_new(gconf->volume);
408 if (!glfs) {
409 goto out;
410 }
411
412 glfs_set_preopened(gconf->volume, glfs);
413
414 for (server = gconf->server; server; server = server->next) {
415 switch (server->value->type) {
416 case SOCKET_ADDRESS_FLAT_TYPE_UNIX:
417 ret = glfs_set_volfile_server(glfs, "unix",
418 server->value->u.q_unix.path, 0);
419 break;
420 case SOCKET_ADDRESS_FLAT_TYPE_INET:
421 if (parse_uint_full(server->value->u.inet.port, &port, 10) < 0 ||
422 port > 65535) {
423 error_setg(errp, "'%s' is not a valid port number",
424 server->value->u.inet.port);
425 errno = EINVAL;
426 goto out;
427 }
428 ret = glfs_set_volfile_server(glfs, "tcp",
429 server->value->u.inet.host,
430 (int)port);
431 break;
432 case SOCKET_ADDRESS_FLAT_TYPE_VSOCK:
433 case SOCKET_ADDRESS_FLAT_TYPE_FD:
434 default:
435 abort();
436 }
437
438 if (ret < 0) {
439 goto out;
440 }
441 }
442
443 ret = glfs_set_logging(glfs, gconf->logfile, gconf->debug);
444 if (ret < 0) {
445 goto out;
446 }
447
448 ret = glfs_init(glfs);
449 if (ret) {
450 error_setg(errp, "Gluster connection for volume %s, path %s failed"
451 " to connect", gconf->volume, gconf->path);
452 for (server = gconf->server; server; server = server->next) {
453 if (server->value->type == SOCKET_ADDRESS_FLAT_TYPE_UNIX) {
454 error_append_hint(errp, "hint: failed on socket %s ",
455 server->value->u.q_unix.path);
456 } else {
457 error_append_hint(errp, "hint: failed on host %s and port %s ",
458 server->value->u.inet.host,
459 server->value->u.inet.port);
460 }
461 }
462
463 error_append_hint(errp, "Please refer to gluster logs for more info\n");
464
465 /* glfs_init sometimes doesn't set errno although docs suggest that */
466 if (errno == 0) {
467 errno = EINVAL;
468 }
469
470 goto out;
471 }
472 return glfs;
473
474 out:
475 if (glfs) {
476 old_errno = errno;
477 glfs_clear_preopened(glfs);
478 errno = old_errno;
479 }
480 return NULL;
481 }
482
483 /*
484 * Convert the json formatted command line into qapi.
485 */
486 static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf,
487 QDict *options, Error **errp)
488 {
489 QemuOpts *opts;
490 SocketAddressFlat *gsconf = NULL;
491 SocketAddressFlatList *curr = NULL;
492 QDict *backing_options = NULL;
493 Error *local_err = NULL;
494 char *str = NULL;
495 const char *ptr;
496 size_t num_servers;
497 int i, type;
498
499 /* create opts info from runtime_json_opts list */
500 opts = qemu_opts_create(&runtime_json_opts, NULL, 0, &error_abort);
501 qemu_opts_absorb_qdict(opts, options, &local_err);
502 if (local_err) {
503 goto out;
504 }
505
506 num_servers = qdict_array_entries(options, GLUSTER_OPT_SERVER_PATTERN);
507 if (num_servers < 1) {
508 error_setg(&local_err, QERR_MISSING_PARAMETER, "server");
509 goto out;
510 }
511
512 ptr = qemu_opt_get(opts, GLUSTER_OPT_VOLUME);
513 if (!ptr) {
514 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_VOLUME);
515 goto out;
516 }
517 gconf->volume = g_strdup(ptr);
518
519 ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH);
520 if (!ptr) {
521 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_PATH);
522 goto out;
523 }
524 gconf->path = g_strdup(ptr);
525 qemu_opts_del(opts);
526
527 for (i = 0; i < num_servers; i++) {
528 str = g_strdup_printf(GLUSTER_OPT_SERVER_PATTERN"%d.", i);
529 qdict_extract_subqdict(options, &backing_options, str);
530
531 /* create opts info from runtime_type_opts list */
532 opts = qemu_opts_create(&runtime_type_opts, NULL, 0, &error_abort);
533 qemu_opts_absorb_qdict(opts, backing_options, &local_err);
534 if (local_err) {
535 goto out;
536 }
537
538 ptr = qemu_opt_get(opts, GLUSTER_OPT_TYPE);
539 if (!ptr) {
540 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_TYPE);
541 error_append_hint(&local_err, GERR_INDEX_HINT, i);
542 goto out;
543
544 }
545 gsconf = g_new0(SocketAddressFlat, 1);
546 if (!strcmp(ptr, "tcp")) {
547 ptr = "inet"; /* accept legacy "tcp" */
548 }
549 type = qapi_enum_parse(SocketAddressFlatType_lookup, ptr,
550 SOCKET_ADDRESS_FLAT_TYPE__MAX, -1, NULL);
551 if (type != SOCKET_ADDRESS_FLAT_TYPE_INET
552 && type != SOCKET_ADDRESS_FLAT_TYPE_UNIX) {
553 error_setg(&local_err,
554 "Parameter '%s' may be 'inet' or 'unix'",
555 GLUSTER_OPT_TYPE);
556 error_append_hint(&local_err, GERR_INDEX_HINT, i);
557 goto out;
558 }
559 gsconf->type = type;
560 qemu_opts_del(opts);
561
562 if (gsconf->type == SOCKET_ADDRESS_FLAT_TYPE_INET) {
563 /* create opts info from runtime_inet_opts list */
564 opts = qemu_opts_create(&runtime_inet_opts, NULL, 0, &error_abort);
565 qemu_opts_absorb_qdict(opts, backing_options, &local_err);
566 if (local_err) {
567 goto out;
568 }
569
570 ptr = qemu_opt_get(opts, GLUSTER_OPT_HOST);
571 if (!ptr) {
572 error_setg(&local_err, QERR_MISSING_PARAMETER,
573 GLUSTER_OPT_HOST);
574 error_append_hint(&local_err, GERR_INDEX_HINT, i);
575 goto out;
576 }
577 gsconf->u.inet.host = g_strdup(ptr);
578 ptr = qemu_opt_get(opts, GLUSTER_OPT_PORT);
579 if (!ptr) {
580 error_setg(&local_err, QERR_MISSING_PARAMETER,
581 GLUSTER_OPT_PORT);
582 error_append_hint(&local_err, GERR_INDEX_HINT, i);
583 goto out;
584 }
585 gsconf->u.inet.port = g_strdup(ptr);
586
587 /* defend for unsupported fields in InetSocketAddress,
588 * i.e. @ipv4, @ipv6 and @to
589 */
590 ptr = qemu_opt_get(opts, GLUSTER_OPT_TO);
591 if (ptr) {
592 gsconf->u.inet.has_to = true;
593 }
594 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV4);
595 if (ptr) {
596 gsconf->u.inet.has_ipv4 = true;
597 }
598 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV6);
599 if (ptr) {
600 gsconf->u.inet.has_ipv6 = true;
601 }
602 if (gsconf->u.inet.has_to) {
603 error_setg(&local_err, "Parameter 'to' not supported");
604 goto out;
605 }
606 if (gsconf->u.inet.has_ipv4 || gsconf->u.inet.has_ipv6) {
607 error_setg(&local_err, "Parameters 'ipv4/ipv6' not supported");
608 goto out;
609 }
610 qemu_opts_del(opts);
611 } else {
612 /* create opts info from runtime_unix_opts list */
613 opts = qemu_opts_create(&runtime_unix_opts, NULL, 0, &error_abort);
614 qemu_opts_absorb_qdict(opts, backing_options, &local_err);
615 if (local_err) {
616 goto out;
617 }
618
619 ptr = qemu_opt_get(opts, GLUSTER_OPT_SOCKET);
620 if (!ptr) {
621 error_setg(&local_err, QERR_MISSING_PARAMETER,
622 GLUSTER_OPT_SOCKET);
623 error_append_hint(&local_err, GERR_INDEX_HINT, i);
624 goto out;
625 }
626 gsconf->u.q_unix.path = g_strdup(ptr);
627 qemu_opts_del(opts);
628 }
629
630 if (gconf->server == NULL) {
631 gconf->server = g_new0(SocketAddressFlatList, 1);
632 gconf->server->value = gsconf;
633 curr = gconf->server;
634 } else {
635 curr->next = g_new0(SocketAddressFlatList, 1);
636 curr->next->value = gsconf;
637 curr = curr->next;
638 }
639 gsconf = NULL;
640
641 QDECREF(backing_options);
642 backing_options = NULL;
643 g_free(str);
644 str = NULL;
645 }
646
647 return 0;
648
649 out:
650 error_propagate(errp, local_err);
651 qapi_free_SocketAddressFlat(gsconf);
652 qemu_opts_del(opts);
653 g_free(str);
654 QDECREF(backing_options);
655 errno = EINVAL;
656 return -errno;
657 }
658
659 static struct glfs *qemu_gluster_init(BlockdevOptionsGluster *gconf,
660 const char *filename,
661 QDict *options, Error **errp)
662 {
663 int ret;
664 if (filename) {
665 ret = qemu_gluster_parse_uri(gconf, filename);
666 if (ret < 0) {
667 error_setg(errp, "invalid URI");
668 error_append_hint(errp, "Usage: file=gluster[+transport]://"
669 "[host[:port]]volume/path[?socket=...]"
670 "[,file.debug=N]"
671 "[,file.logfile=/path/filename.log]\n");
672 errno = -ret;
673 return NULL;
674 }
675 } else {
676 ret = qemu_gluster_parse_json(gconf, options, errp);
677 if (ret < 0) {
678 error_append_hint(errp, "Usage: "
679 "-drive driver=qcow2,file.driver=gluster,"
680 "file.volume=testvol,file.path=/path/a.qcow2"
681 "[,file.debug=9]"
682 "[,file.logfile=/path/filename.log],"
683 "file.server.0.type=inet,"
684 "file.server.0.host=1.2.3.4,"
685 "file.server.0.port=24007,"
686 "file.server.1.transport=unix,"
687 "file.server.1.socket=/var/run/glusterd.socket ..."
688 "\n");
689 errno = -ret;
690 return NULL;
691 }
692
693 }
694
695 return qemu_gluster_glfs_init(gconf, errp);
696 }
697
698 /*
699 * AIO callback routine called from GlusterFS thread.
700 */
701 static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret, void *arg)
702 {
703 GlusterAIOCB *acb = (GlusterAIOCB *)arg;
704
705 if (!ret || ret == acb->size) {
706 acb->ret = 0; /* Success */
707 } else if (ret < 0) {
708 acb->ret = -errno; /* Read/Write failed */
709 } else {
710 acb->ret = -EIO; /* Partial read/write - fail it */
711 }
712
713 aio_co_schedule(acb->aio_context, acb->coroutine);
714 }
715
716 static void qemu_gluster_parse_flags(int bdrv_flags, int *open_flags)
717 {
718 assert(open_flags != NULL);
719
720 *open_flags |= O_BINARY;
721
722 if (bdrv_flags & BDRV_O_RDWR) {
723 *open_flags |= O_RDWR;
724 } else {
725 *open_flags |= O_RDONLY;
726 }
727
728 if ((bdrv_flags & BDRV_O_NOCACHE)) {
729 *open_flags |= O_DIRECT;
730 }
731 }
732
733 /*
734 * Do SEEK_DATA/HOLE to detect if it is functional. Older broken versions of
735 * gfapi incorrectly return the current offset when SEEK_DATA/HOLE is used.
736 * - Corrected versions return -1 and set errno to EINVAL.
737 * - Versions that support SEEK_DATA/HOLE correctly, will return -1 and set
738 * errno to ENXIO when SEEK_DATA is called with a position of EOF.
739 */
740 static bool qemu_gluster_test_seek(struct glfs_fd *fd)
741 {
742 off_t ret = 0;
743
744 #if defined SEEK_HOLE && defined SEEK_DATA
745 off_t eof;
746
747 eof = glfs_lseek(fd, 0, SEEK_END);
748 if (eof < 0) {
749 /* this should never occur */
750 return false;
751 }
752
753 /* this should always fail with ENXIO if SEEK_DATA is supported */
754 ret = glfs_lseek(fd, eof, SEEK_DATA);
755 #endif
756
757 return (ret < 0) && (errno == ENXIO);
758 }
759
760 static int qemu_gluster_open(BlockDriverState *bs, QDict *options,
761 int bdrv_flags, Error **errp)
762 {
763 BDRVGlusterState *s = bs->opaque;
764 int open_flags = 0;
765 int ret = 0;
766 BlockdevOptionsGluster *gconf = NULL;
767 QemuOpts *opts;
768 Error *local_err = NULL;
769 const char *filename, *logfile;
770
771 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
772 qemu_opts_absorb_qdict(opts, options, &local_err);
773 if (local_err) {
774 error_propagate(errp, local_err);
775 ret = -EINVAL;
776 goto out;
777 }
778
779 filename = qemu_opt_get(opts, GLUSTER_OPT_FILENAME);
780
781 s->debug = qemu_opt_get_number(opts, GLUSTER_OPT_DEBUG,
782 GLUSTER_DEBUG_DEFAULT);
783 if (s->debug < 0) {
784 s->debug = 0;
785 } else if (s->debug > GLUSTER_DEBUG_MAX) {
786 s->debug = GLUSTER_DEBUG_MAX;
787 }
788
789 gconf = g_new0(BlockdevOptionsGluster, 1);
790 gconf->debug = s->debug;
791 gconf->has_debug = true;
792
793 logfile = qemu_opt_get(opts, GLUSTER_OPT_LOGFILE);
794 s->logfile = g_strdup(logfile ? logfile : GLUSTER_LOGFILE_DEFAULT);
795
796 gconf->logfile = g_strdup(s->logfile);
797 gconf->has_logfile = true;
798
799 s->glfs = qemu_gluster_init(gconf, filename, options, errp);
800 if (!s->glfs) {
801 ret = -errno;
802 goto out;
803 }
804
805 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT
806 /* Without this, if fsync fails for a recoverable reason (for instance,
807 * ENOSPC), gluster will dump its cache, preventing retries. This means
808 * almost certain data loss. Not all gluster versions support the
809 * 'resync-failed-syncs-after-fsync' key value, but there is no way to
810 * discover during runtime if it is supported (this api returns success for
811 * unknown key/value pairs) */
812 ret = glfs_set_xlator_option(s->glfs, "*-write-behind",
813 "resync-failed-syncs-after-fsync",
814 "on");
815 if (ret < 0) {
816 error_setg_errno(errp, errno, "Unable to set xlator key/value pair");
817 ret = -errno;
818 goto out;
819 }
820 #endif
821
822 qemu_gluster_parse_flags(bdrv_flags, &open_flags);
823
824 s->fd = glfs_open(s->glfs, gconf->path, open_flags);
825 if (!s->fd) {
826 ret = -errno;
827 }
828
829 s->supports_seek_data = qemu_gluster_test_seek(s->fd);
830
831 out:
832 qemu_opts_del(opts);
833 qapi_free_BlockdevOptionsGluster(gconf);
834 if (!ret) {
835 return ret;
836 }
837 g_free(s->logfile);
838 if (s->fd) {
839 glfs_close(s->fd);
840 }
841
842 glfs_clear_preopened(s->glfs);
843
844 return ret;
845 }
846
847 static int qemu_gluster_reopen_prepare(BDRVReopenState *state,
848 BlockReopenQueue *queue, Error **errp)
849 {
850 int ret = 0;
851 BDRVGlusterState *s;
852 BDRVGlusterReopenState *reop_s;
853 BlockdevOptionsGluster *gconf;
854 int open_flags = 0;
855
856 assert(state != NULL);
857 assert(state->bs != NULL);
858
859 s = state->bs->opaque;
860
861 state->opaque = g_new0(BDRVGlusterReopenState, 1);
862 reop_s = state->opaque;
863
864 qemu_gluster_parse_flags(state->flags, &open_flags);
865
866 gconf = g_new0(BlockdevOptionsGluster, 1);
867 gconf->debug = s->debug;
868 gconf->has_debug = true;
869 gconf->logfile = g_strdup(s->logfile);
870 gconf->has_logfile = true;
871 reop_s->glfs = qemu_gluster_init(gconf, state->bs->filename, NULL, errp);
872 if (reop_s->glfs == NULL) {
873 ret = -errno;
874 goto exit;
875 }
876
877 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT
878 ret = glfs_set_xlator_option(reop_s->glfs, "*-write-behind",
879 "resync-failed-syncs-after-fsync", "on");
880 if (ret < 0) {
881 error_setg_errno(errp, errno, "Unable to set xlator key/value pair");
882 ret = -errno;
883 goto exit;
884 }
885 #endif
886
887 reop_s->fd = glfs_open(reop_s->glfs, gconf->path, open_flags);
888 if (reop_s->fd == NULL) {
889 /* reops->glfs will be cleaned up in _abort */
890 ret = -errno;
891 goto exit;
892 }
893
894 exit:
895 /* state->opaque will be freed in either the _abort or _commit */
896 qapi_free_BlockdevOptionsGluster(gconf);
897 return ret;
898 }
899
900 static void qemu_gluster_reopen_commit(BDRVReopenState *state)
901 {
902 BDRVGlusterReopenState *reop_s = state->opaque;
903 BDRVGlusterState *s = state->bs->opaque;
904
905
906 /* close the old */
907 if (s->fd) {
908 glfs_close(s->fd);
909 }
910
911 glfs_clear_preopened(s->glfs);
912
913 /* use the newly opened image / connection */
914 s->fd = reop_s->fd;
915 s->glfs = reop_s->glfs;
916
917 g_free(state->opaque);
918 state->opaque = NULL;
919
920 return;
921 }
922
923
924 static void qemu_gluster_reopen_abort(BDRVReopenState *state)
925 {
926 BDRVGlusterReopenState *reop_s = state->opaque;
927
928 if (reop_s == NULL) {
929 return;
930 }
931
932 if (reop_s->fd) {
933 glfs_close(reop_s->fd);
934 }
935
936 glfs_clear_preopened(reop_s->glfs);
937
938 g_free(state->opaque);
939 state->opaque = NULL;
940
941 return;
942 }
943
944 #ifdef CONFIG_GLUSTERFS_ZEROFILL
945 static coroutine_fn int qemu_gluster_co_pwrite_zeroes(BlockDriverState *bs,
946 int64_t offset,
947 int size,
948 BdrvRequestFlags flags)
949 {
950 int ret;
951 GlusterAIOCB acb;
952 BDRVGlusterState *s = bs->opaque;
953
954 acb.size = size;
955 acb.ret = 0;
956 acb.coroutine = qemu_coroutine_self();
957 acb.aio_context = bdrv_get_aio_context(bs);
958
959 ret = glfs_zerofill_async(s->fd, offset, size, gluster_finish_aiocb, &acb);
960 if (ret < 0) {
961 return -errno;
962 }
963
964 qemu_coroutine_yield();
965 return acb.ret;
966 }
967
968 static inline bool gluster_supports_zerofill(void)
969 {
970 return 1;
971 }
972
973 static inline int qemu_gluster_zerofill(struct glfs_fd *fd, int64_t offset,
974 int64_t size)
975 {
976 return glfs_zerofill(fd, offset, size);
977 }
978
979 #else
980 static inline bool gluster_supports_zerofill(void)
981 {
982 return 0;
983 }
984
985 static inline int qemu_gluster_zerofill(struct glfs_fd *fd, int64_t offset,
986 int64_t size)
987 {
988 return 0;
989 }
990 #endif
991
992 static int qemu_gluster_create(const char *filename,
993 QemuOpts *opts, Error **errp)
994 {
995 BlockdevOptionsGluster *gconf;
996 struct glfs *glfs;
997 struct glfs_fd *fd;
998 int ret = 0;
999 int prealloc = 0;
1000 int64_t total_size = 0;
1001 char *tmp = NULL;
1002
1003 gconf = g_new0(BlockdevOptionsGluster, 1);
1004 gconf->debug = qemu_opt_get_number_del(opts, GLUSTER_OPT_DEBUG,
1005 GLUSTER_DEBUG_DEFAULT);
1006 if (gconf->debug < 0) {
1007 gconf->debug = 0;
1008 } else if (gconf->debug > GLUSTER_DEBUG_MAX) {
1009 gconf->debug = GLUSTER_DEBUG_MAX;
1010 }
1011 gconf->has_debug = true;
1012
1013 gconf->logfile = qemu_opt_get_del(opts, GLUSTER_OPT_LOGFILE);
1014 if (!gconf->logfile) {
1015 gconf->logfile = g_strdup(GLUSTER_LOGFILE_DEFAULT);
1016 }
1017 gconf->has_logfile = true;
1018
1019 glfs = qemu_gluster_init(gconf, filename, NULL, errp);
1020 if (!glfs) {
1021 ret = -errno;
1022 goto out;
1023 }
1024
1025 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
1026 BDRV_SECTOR_SIZE);
1027
1028 tmp = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
1029 if (!tmp || !strcmp(tmp, "off")) {
1030 prealloc = 0;
1031 } else if (!strcmp(tmp, "full") && gluster_supports_zerofill()) {
1032 prealloc = 1;
1033 } else {
1034 error_setg(errp, "Invalid preallocation mode: '%s'"
1035 " or GlusterFS doesn't support zerofill API", tmp);
1036 ret = -EINVAL;
1037 goto out;
1038 }
1039
1040 fd = glfs_creat(glfs, gconf->path,
1041 O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR | S_IWUSR);
1042 if (!fd) {
1043 ret = -errno;
1044 } else {
1045 if (!glfs_ftruncate(fd, total_size)) {
1046 if (prealloc && qemu_gluster_zerofill(fd, 0, total_size)) {
1047 ret = -errno;
1048 }
1049 } else {
1050 ret = -errno;
1051 }
1052
1053 if (glfs_close(fd) != 0) {
1054 ret = -errno;
1055 }
1056 }
1057 out:
1058 g_free(tmp);
1059 qapi_free_BlockdevOptionsGluster(gconf);
1060 glfs_clear_preopened(glfs);
1061 return ret;
1062 }
1063
1064 static coroutine_fn int qemu_gluster_co_rw(BlockDriverState *bs,
1065 int64_t sector_num, int nb_sectors,
1066 QEMUIOVector *qiov, int write)
1067 {
1068 int ret;
1069 GlusterAIOCB acb;
1070 BDRVGlusterState *s = bs->opaque;
1071 size_t size = nb_sectors * BDRV_SECTOR_SIZE;
1072 off_t offset = sector_num * BDRV_SECTOR_SIZE;
1073
1074 acb.size = size;
1075 acb.ret = 0;
1076 acb.coroutine = qemu_coroutine_self();
1077 acb.aio_context = bdrv_get_aio_context(bs);
1078
1079 if (write) {
1080 ret = glfs_pwritev_async(s->fd, qiov->iov, qiov->niov, offset, 0,
1081 gluster_finish_aiocb, &acb);
1082 } else {
1083 ret = glfs_preadv_async(s->fd, qiov->iov, qiov->niov, offset, 0,
1084 gluster_finish_aiocb, &acb);
1085 }
1086
1087 if (ret < 0) {
1088 return -errno;
1089 }
1090
1091 qemu_coroutine_yield();
1092 return acb.ret;
1093 }
1094
1095 static int qemu_gluster_truncate(BlockDriverState *bs, int64_t offset)
1096 {
1097 int ret;
1098 BDRVGlusterState *s = bs->opaque;
1099
1100 ret = glfs_ftruncate(s->fd, offset);
1101 if (ret < 0) {
1102 return -errno;
1103 }
1104
1105 return 0;
1106 }
1107
1108 static coroutine_fn int qemu_gluster_co_readv(BlockDriverState *bs,
1109 int64_t sector_num,
1110 int nb_sectors,
1111 QEMUIOVector *qiov)
1112 {
1113 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 0);
1114 }
1115
1116 static coroutine_fn int qemu_gluster_co_writev(BlockDriverState *bs,
1117 int64_t sector_num,
1118 int nb_sectors,
1119 QEMUIOVector *qiov)
1120 {
1121 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 1);
1122 }
1123
1124 static void qemu_gluster_close(BlockDriverState *bs)
1125 {
1126 BDRVGlusterState *s = bs->opaque;
1127
1128 g_free(s->logfile);
1129 if (s->fd) {
1130 glfs_close(s->fd);
1131 s->fd = NULL;
1132 }
1133 glfs_clear_preopened(s->glfs);
1134 }
1135
1136 static coroutine_fn int qemu_gluster_co_flush_to_disk(BlockDriverState *bs)
1137 {
1138 int ret;
1139 GlusterAIOCB acb;
1140 BDRVGlusterState *s = bs->opaque;
1141
1142 acb.size = 0;
1143 acb.ret = 0;
1144 acb.coroutine = qemu_coroutine_self();
1145 acb.aio_context = bdrv_get_aio_context(bs);
1146
1147 ret = glfs_fsync_async(s->fd, gluster_finish_aiocb, &acb);
1148 if (ret < 0) {
1149 ret = -errno;
1150 goto error;
1151 }
1152
1153 qemu_coroutine_yield();
1154 if (acb.ret < 0) {
1155 ret = acb.ret;
1156 goto error;
1157 }
1158
1159 return acb.ret;
1160
1161 error:
1162 /* Some versions of Gluster (3.5.6 -> 3.5.8?) will not retain its cache
1163 * after a fsync failure, so we have no way of allowing the guest to safely
1164 * continue. Gluster versions prior to 3.5.6 don't retain the cache
1165 * either, but will invalidate the fd on error, so this is again our only
1166 * option.
1167 *
1168 * The 'resync-failed-syncs-after-fsync' xlator option for the
1169 * write-behind cache will cause later gluster versions to retain its
1170 * cache after error, so long as the fd remains open. However, we
1171 * currently have no way of knowing if this option is supported.
1172 *
1173 * TODO: Once gluster provides a way for us to determine if the option
1174 * is supported, bypass the closure and setting drv to NULL. */
1175 qemu_gluster_close(bs);
1176 bs->drv = NULL;
1177 return ret;
1178 }
1179
1180 #ifdef CONFIG_GLUSTERFS_DISCARD
1181 static coroutine_fn int qemu_gluster_co_pdiscard(BlockDriverState *bs,
1182 int64_t offset, int size)
1183 {
1184 int ret;
1185 GlusterAIOCB acb;
1186 BDRVGlusterState *s = bs->opaque;
1187
1188 acb.size = 0;
1189 acb.ret = 0;
1190 acb.coroutine = qemu_coroutine_self();
1191 acb.aio_context = bdrv_get_aio_context(bs);
1192
1193 ret = glfs_discard_async(s->fd, offset, size, gluster_finish_aiocb, &acb);
1194 if (ret < 0) {
1195 return -errno;
1196 }
1197
1198 qemu_coroutine_yield();
1199 return acb.ret;
1200 }
1201 #endif
1202
1203 static int64_t qemu_gluster_getlength(BlockDriverState *bs)
1204 {
1205 BDRVGlusterState *s = bs->opaque;
1206 int64_t ret;
1207
1208 ret = glfs_lseek(s->fd, 0, SEEK_END);
1209 if (ret < 0) {
1210 return -errno;
1211 } else {
1212 return ret;
1213 }
1214 }
1215
1216 static int64_t qemu_gluster_allocated_file_size(BlockDriverState *bs)
1217 {
1218 BDRVGlusterState *s = bs->opaque;
1219 struct stat st;
1220 int ret;
1221
1222 ret = glfs_fstat(s->fd, &st);
1223 if (ret < 0) {
1224 return -errno;
1225 } else {
1226 return st.st_blocks * 512;
1227 }
1228 }
1229
1230 static int qemu_gluster_has_zero_init(BlockDriverState *bs)
1231 {
1232 /* GlusterFS volume could be backed by a block device */
1233 return 0;
1234 }
1235
1236 /*
1237 * Find allocation range in @bs around offset @start.
1238 * May change underlying file descriptor's file offset.
1239 * If @start is not in a hole, store @start in @data, and the
1240 * beginning of the next hole in @hole, and return 0.
1241 * If @start is in a non-trailing hole, store @start in @hole and the
1242 * beginning of the next non-hole in @data, and return 0.
1243 * If @start is in a trailing hole or beyond EOF, return -ENXIO.
1244 * If we can't find out, return a negative errno other than -ENXIO.
1245 *
1246 * (Shamefully copied from file-posix.c, only miniscule adaptions.)
1247 */
1248 static int find_allocation(BlockDriverState *bs, off_t start,
1249 off_t *data, off_t *hole)
1250 {
1251 BDRVGlusterState *s = bs->opaque;
1252
1253 if (!s->supports_seek_data) {
1254 goto exit;
1255 }
1256
1257 #if defined SEEK_HOLE && defined SEEK_DATA
1258 off_t offs;
1259
1260 /*
1261 * SEEK_DATA cases:
1262 * D1. offs == start: start is in data
1263 * D2. offs > start: start is in a hole, next data at offs
1264 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole
1265 * or start is beyond EOF
1266 * If the latter happens, the file has been truncated behind
1267 * our back since we opened it. All bets are off then.
1268 * Treating like a trailing hole is simplest.
1269 * D4. offs < 0, errno != ENXIO: we learned nothing
1270 */
1271 offs = glfs_lseek(s->fd, start, SEEK_DATA);
1272 if (offs < 0) {
1273 return -errno; /* D3 or D4 */
1274 }
1275 assert(offs >= start);
1276
1277 if (offs > start) {
1278 /* D2: in hole, next data at offs */
1279 *hole = start;
1280 *data = offs;
1281 return 0;
1282 }
1283
1284 /* D1: in data, end not yet known */
1285
1286 /*
1287 * SEEK_HOLE cases:
1288 * H1. offs == start: start is in a hole
1289 * If this happens here, a hole has been dug behind our back
1290 * since the previous lseek().
1291 * H2. offs > start: either start is in data, next hole at offs,
1292 * or start is in trailing hole, EOF at offs
1293 * Linux treats trailing holes like any other hole: offs ==
1294 * start. Solaris seeks to EOF instead: offs > start (blech).
1295 * If that happens here, a hole has been dug behind our back
1296 * since the previous lseek().
1297 * H3. offs < 0, errno = ENXIO: start is beyond EOF
1298 * If this happens, the file has been truncated behind our
1299 * back since we opened it. Treat it like a trailing hole.
1300 * H4. offs < 0, errno != ENXIO: we learned nothing
1301 * Pretend we know nothing at all, i.e. "forget" about D1.
1302 */
1303 offs = glfs_lseek(s->fd, start, SEEK_HOLE);
1304 if (offs < 0) {
1305 return -errno; /* D1 and (H3 or H4) */
1306 }
1307 assert(offs >= start);
1308
1309 if (offs > start) {
1310 /*
1311 * D1 and H2: either in data, next hole at offs, or it was in
1312 * data but is now in a trailing hole. In the latter case,
1313 * all bets are off. Treating it as if it there was data all
1314 * the way to EOF is safe, so simply do that.
1315 */
1316 *data = start;
1317 *hole = offs;
1318 return 0;
1319 }
1320
1321 /* D1 and H1 */
1322 return -EBUSY;
1323 #endif
1324
1325 exit:
1326 return -ENOTSUP;
1327 }
1328
1329 /*
1330 * Returns the allocation status of the specified sectors.
1331 *
1332 * If 'sector_num' is beyond the end of the disk image the return value is 0
1333 * and 'pnum' is set to 0.
1334 *
1335 * 'pnum' is set to the number of sectors (including and immediately following
1336 * the specified sector) that are known to be in the same
1337 * allocated/unallocated state.
1338 *
1339 * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
1340 * beyond the end of the disk image it will be clamped.
1341 *
1342 * (Based on raw_co_get_block_status() from file-posix.c.)
1343 */
1344 static int64_t coroutine_fn qemu_gluster_co_get_block_status(
1345 BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum,
1346 BlockDriverState **file)
1347 {
1348 BDRVGlusterState *s = bs->opaque;
1349 off_t start, data = 0, hole = 0;
1350 int64_t total_size;
1351 int ret = -EINVAL;
1352
1353 if (!s->fd) {
1354 return ret;
1355 }
1356
1357 start = sector_num * BDRV_SECTOR_SIZE;
1358 total_size = bdrv_getlength(bs);
1359 if (total_size < 0) {
1360 return total_size;
1361 } else if (start >= total_size) {
1362 *pnum = 0;
1363 return 0;
1364 } else if (start + nb_sectors * BDRV_SECTOR_SIZE > total_size) {
1365 nb_sectors = DIV_ROUND_UP(total_size - start, BDRV_SECTOR_SIZE);
1366 }
1367
1368 ret = find_allocation(bs, start, &data, &hole);
1369 if (ret == -ENXIO) {
1370 /* Trailing hole */
1371 *pnum = nb_sectors;
1372 ret = BDRV_BLOCK_ZERO;
1373 } else if (ret < 0) {
1374 /* No info available, so pretend there are no holes */
1375 *pnum = nb_sectors;
1376 ret = BDRV_BLOCK_DATA;
1377 } else if (data == start) {
1378 /* On a data extent, compute sectors to the end of the extent,
1379 * possibly including a partial sector at EOF. */
1380 *pnum = MIN(nb_sectors, DIV_ROUND_UP(hole - start, BDRV_SECTOR_SIZE));
1381 ret = BDRV_BLOCK_DATA;
1382 } else {
1383 /* On a hole, compute sectors to the beginning of the next extent. */
1384 assert(hole == start);
1385 *pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE);
1386 ret = BDRV_BLOCK_ZERO;
1387 }
1388
1389 *file = bs;
1390
1391 return ret | BDRV_BLOCK_OFFSET_VALID | start;
1392 }
1393
1394
1395 static BlockDriver bdrv_gluster = {
1396 .format_name = "gluster",
1397 .protocol_name = "gluster",
1398 .instance_size = sizeof(BDRVGlusterState),
1399 .bdrv_needs_filename = false,
1400 .bdrv_file_open = qemu_gluster_open,
1401 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1402 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1403 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1404 .bdrv_close = qemu_gluster_close,
1405 .bdrv_create = qemu_gluster_create,
1406 .bdrv_getlength = qemu_gluster_getlength,
1407 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
1408 .bdrv_truncate = qemu_gluster_truncate,
1409 .bdrv_co_readv = qemu_gluster_co_readv,
1410 .bdrv_co_writev = qemu_gluster_co_writev,
1411 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1412 .bdrv_has_zero_init = qemu_gluster_has_zero_init,
1413 #ifdef CONFIG_GLUSTERFS_DISCARD
1414 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1415 #endif
1416 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1417 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1418 #endif
1419 .bdrv_co_get_block_status = qemu_gluster_co_get_block_status,
1420 .create_opts = &qemu_gluster_create_opts,
1421 };
1422
1423 static BlockDriver bdrv_gluster_tcp = {
1424 .format_name = "gluster",
1425 .protocol_name = "gluster+tcp",
1426 .instance_size = sizeof(BDRVGlusterState),
1427 .bdrv_needs_filename = false,
1428 .bdrv_file_open = qemu_gluster_open,
1429 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1430 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1431 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1432 .bdrv_close = qemu_gluster_close,
1433 .bdrv_create = qemu_gluster_create,
1434 .bdrv_getlength = qemu_gluster_getlength,
1435 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
1436 .bdrv_truncate = qemu_gluster_truncate,
1437 .bdrv_co_readv = qemu_gluster_co_readv,
1438 .bdrv_co_writev = qemu_gluster_co_writev,
1439 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1440 .bdrv_has_zero_init = qemu_gluster_has_zero_init,
1441 #ifdef CONFIG_GLUSTERFS_DISCARD
1442 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1443 #endif
1444 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1445 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1446 #endif
1447 .bdrv_co_get_block_status = qemu_gluster_co_get_block_status,
1448 .create_opts = &qemu_gluster_create_opts,
1449 };
1450
1451 static BlockDriver bdrv_gluster_unix = {
1452 .format_name = "gluster",
1453 .protocol_name = "gluster+unix",
1454 .instance_size = sizeof(BDRVGlusterState),
1455 .bdrv_needs_filename = true,
1456 .bdrv_file_open = qemu_gluster_open,
1457 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1458 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1459 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1460 .bdrv_close = qemu_gluster_close,
1461 .bdrv_create = qemu_gluster_create,
1462 .bdrv_getlength = qemu_gluster_getlength,
1463 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
1464 .bdrv_truncate = qemu_gluster_truncate,
1465 .bdrv_co_readv = qemu_gluster_co_readv,
1466 .bdrv_co_writev = qemu_gluster_co_writev,
1467 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1468 .bdrv_has_zero_init = qemu_gluster_has_zero_init,
1469 #ifdef CONFIG_GLUSTERFS_DISCARD
1470 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1471 #endif
1472 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1473 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1474 #endif
1475 .bdrv_co_get_block_status = qemu_gluster_co_get_block_status,
1476 .create_opts = &qemu_gluster_create_opts,
1477 };
1478
1479 /* rdma is deprecated (actually never supported for volfile fetch).
1480 * Let's maintain it for the protocol compatibility, to make sure things
1481 * won't break immediately. For now, gluster+rdma will fall back to gluster+tcp
1482 * protocol with a warning.
1483 * TODO: remove gluster+rdma interface support
1484 */
1485 static BlockDriver bdrv_gluster_rdma = {
1486 .format_name = "gluster",
1487 .protocol_name = "gluster+rdma",
1488 .instance_size = sizeof(BDRVGlusterState),
1489 .bdrv_needs_filename = true,
1490 .bdrv_file_open = qemu_gluster_open,
1491 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1492 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1493 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1494 .bdrv_close = qemu_gluster_close,
1495 .bdrv_create = qemu_gluster_create,
1496 .bdrv_getlength = qemu_gluster_getlength,
1497 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
1498 .bdrv_truncate = qemu_gluster_truncate,
1499 .bdrv_co_readv = qemu_gluster_co_readv,
1500 .bdrv_co_writev = qemu_gluster_co_writev,
1501 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1502 .bdrv_has_zero_init = qemu_gluster_has_zero_init,
1503 #ifdef CONFIG_GLUSTERFS_DISCARD
1504 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1505 #endif
1506 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1507 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1508 #endif
1509 .bdrv_co_get_block_status = qemu_gluster_co_get_block_status,
1510 .create_opts = &qemu_gluster_create_opts,
1511 };
1512
1513 static void bdrv_gluster_init(void)
1514 {
1515 bdrv_register(&bdrv_gluster_rdma);
1516 bdrv_register(&bdrv_gluster_unix);
1517 bdrv_register(&bdrv_gluster_tcp);
1518 bdrv_register(&bdrv_gluster);
1519 }
1520
1521 block_init(bdrv_gluster_init);