error: Eliminate error_propagate() with Coccinelle, part 2
[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
11 #include "qemu/osdep.h"
12 #include "qemu/units.h"
13 #include <glusterfs/api/glfs.h>
14 #include "block/block_int.h"
15 #include "block/qdict.h"
16 #include "qapi/error.h"
17 #include "qapi/qmp/qdict.h"
18 #include "qapi/qmp/qerror.h"
19 #include "qemu/uri.h"
20 #include "qemu/error-report.h"
21 #include "qemu/module.h"
22 #include "qemu/option.h"
23 #include "qemu/cutils.h"
24
25 #ifdef CONFIG_GLUSTERFS_FTRUNCATE_HAS_STAT
26 # define glfs_ftruncate(fd, offset) glfs_ftruncate(fd, offset, NULL, NULL)
27 #endif
28
29 #define GLUSTER_OPT_FILENAME "filename"
30 #define GLUSTER_OPT_VOLUME "volume"
31 #define GLUSTER_OPT_PATH "path"
32 #define GLUSTER_OPT_TYPE "type"
33 #define GLUSTER_OPT_SERVER_PATTERN "server."
34 #define GLUSTER_OPT_HOST "host"
35 #define GLUSTER_OPT_PORT "port"
36 #define GLUSTER_OPT_TO "to"
37 #define GLUSTER_OPT_IPV4 "ipv4"
38 #define GLUSTER_OPT_IPV6 "ipv6"
39 #define GLUSTER_OPT_SOCKET "socket"
40 #define GLUSTER_OPT_DEBUG "debug"
41 #define GLUSTER_DEFAULT_PORT 24007
42 #define GLUSTER_DEBUG_DEFAULT 4
43 #define GLUSTER_DEBUG_MAX 9
44 #define GLUSTER_OPT_LOGFILE "logfile"
45 #define GLUSTER_LOGFILE_DEFAULT "-" /* handled in libgfapi as /dev/stderr */
46 /*
47 * Several versions of GlusterFS (3.12? -> 6.0.1) fail when the transfer size
48 * is greater or equal to 1024 MiB, so we are limiting the transfer size to 512
49 * MiB to avoid this rare issue.
50 */
51 #define GLUSTER_MAX_TRANSFER (512 * MiB)
52
53 #define GERR_INDEX_HINT "hint: check in 'server' array index '%d'\n"
54
55 typedef struct GlusterAIOCB {
56 int64_t size;
57 int ret;
58 Coroutine *coroutine;
59 AioContext *aio_context;
60 } GlusterAIOCB;
61
62 typedef struct BDRVGlusterState {
63 struct glfs *glfs;
64 struct glfs_fd *fd;
65 char *logfile;
66 bool supports_seek_data;
67 int debug;
68 } BDRVGlusterState;
69
70 typedef struct BDRVGlusterReopenState {
71 struct glfs *glfs;
72 struct glfs_fd *fd;
73 } BDRVGlusterReopenState;
74
75
76 typedef struct GlfsPreopened {
77 char *volume;
78 glfs_t *fs;
79 int ref;
80 } GlfsPreopened;
81
82 typedef struct ListElement {
83 QLIST_ENTRY(ListElement) list;
84 GlfsPreopened saved;
85 } ListElement;
86
87 static QLIST_HEAD(, ListElement) glfs_list;
88
89 static QemuOptsList qemu_gluster_create_opts = {
90 .name = "qemu-gluster-create-opts",
91 .head = QTAILQ_HEAD_INITIALIZER(qemu_gluster_create_opts.head),
92 .desc = {
93 {
94 .name = BLOCK_OPT_SIZE,
95 .type = QEMU_OPT_SIZE,
96 .help = "Virtual disk size"
97 },
98 {
99 .name = BLOCK_OPT_PREALLOC,
100 .type = QEMU_OPT_STRING,
101 .help = "Preallocation mode (allowed values: off"
102 #ifdef CONFIG_GLUSTERFS_FALLOCATE
103 ", falloc"
104 #endif
105 #ifdef CONFIG_GLUSTERFS_ZEROFILL
106 ", full"
107 #endif
108 ")"
109 },
110 {
111 .name = GLUSTER_OPT_DEBUG,
112 .type = QEMU_OPT_NUMBER,
113 .help = "Gluster log level, valid range is 0-9",
114 },
115 {
116 .name = GLUSTER_OPT_LOGFILE,
117 .type = QEMU_OPT_STRING,
118 .help = "Logfile path of libgfapi",
119 },
120 { /* end of list */ }
121 }
122 };
123
124 static QemuOptsList runtime_opts = {
125 .name = "gluster",
126 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
127 .desc = {
128 {
129 .name = GLUSTER_OPT_FILENAME,
130 .type = QEMU_OPT_STRING,
131 .help = "URL to the gluster image",
132 },
133 {
134 .name = GLUSTER_OPT_DEBUG,
135 .type = QEMU_OPT_NUMBER,
136 .help = "Gluster log level, valid range is 0-9",
137 },
138 {
139 .name = GLUSTER_OPT_LOGFILE,
140 .type = QEMU_OPT_STRING,
141 .help = "Logfile path of libgfapi",
142 },
143 { /* end of list */ }
144 },
145 };
146
147 static QemuOptsList runtime_json_opts = {
148 .name = "gluster_json",
149 .head = QTAILQ_HEAD_INITIALIZER(runtime_json_opts.head),
150 .desc = {
151 {
152 .name = GLUSTER_OPT_VOLUME,
153 .type = QEMU_OPT_STRING,
154 .help = "name of gluster volume where VM image resides",
155 },
156 {
157 .name = GLUSTER_OPT_PATH,
158 .type = QEMU_OPT_STRING,
159 .help = "absolute path to image file in gluster volume",
160 },
161 {
162 .name = GLUSTER_OPT_DEBUG,
163 .type = QEMU_OPT_NUMBER,
164 .help = "Gluster log level, valid range is 0-9",
165 },
166 { /* end of list */ }
167 },
168 };
169
170 static QemuOptsList runtime_type_opts = {
171 .name = "gluster_type",
172 .head = QTAILQ_HEAD_INITIALIZER(runtime_type_opts.head),
173 .desc = {
174 {
175 .name = GLUSTER_OPT_TYPE,
176 .type = QEMU_OPT_STRING,
177 .help = "inet|unix",
178 },
179 { /* end of list */ }
180 },
181 };
182
183 static QemuOptsList runtime_unix_opts = {
184 .name = "gluster_unix",
185 .head = QTAILQ_HEAD_INITIALIZER(runtime_unix_opts.head),
186 .desc = {
187 {
188 .name = GLUSTER_OPT_SOCKET,
189 .type = QEMU_OPT_STRING,
190 .help = "socket file path (legacy)",
191 },
192 {
193 .name = GLUSTER_OPT_PATH,
194 .type = QEMU_OPT_STRING,
195 .help = "socket file path (QAPI)",
196 },
197 { /* end of list */ }
198 },
199 };
200
201 static QemuOptsList runtime_inet_opts = {
202 .name = "gluster_inet",
203 .head = QTAILQ_HEAD_INITIALIZER(runtime_inet_opts.head),
204 .desc = {
205 {
206 .name = GLUSTER_OPT_TYPE,
207 .type = QEMU_OPT_STRING,
208 .help = "inet|unix",
209 },
210 {
211 .name = GLUSTER_OPT_HOST,
212 .type = QEMU_OPT_STRING,
213 .help = "host address (hostname/ipv4/ipv6 addresses)",
214 },
215 {
216 .name = GLUSTER_OPT_PORT,
217 .type = QEMU_OPT_STRING,
218 .help = "port number on which glusterd is listening (default 24007)",
219 },
220 {
221 .name = "to",
222 .type = QEMU_OPT_NUMBER,
223 .help = "max port number, not supported by gluster",
224 },
225 {
226 .name = "ipv4",
227 .type = QEMU_OPT_BOOL,
228 .help = "ipv4 bool value, not supported by gluster",
229 },
230 {
231 .name = "ipv6",
232 .type = QEMU_OPT_BOOL,
233 .help = "ipv6 bool value, not supported by gluster",
234 },
235 { /* end of list */ }
236 },
237 };
238
239 static void glfs_set_preopened(const char *volume, glfs_t *fs)
240 {
241 ListElement *entry = NULL;
242
243 entry = g_new(ListElement, 1);
244
245 entry->saved.volume = g_strdup(volume);
246
247 entry->saved.fs = fs;
248 entry->saved.ref = 1;
249
250 QLIST_INSERT_HEAD(&glfs_list, entry, list);
251 }
252
253 static glfs_t *glfs_find_preopened(const char *volume)
254 {
255 ListElement *entry = NULL;
256
257 QLIST_FOREACH(entry, &glfs_list, list) {
258 if (strcmp(entry->saved.volume, volume) == 0) {
259 entry->saved.ref++;
260 return entry->saved.fs;
261 }
262 }
263
264 return NULL;
265 }
266
267 static void glfs_clear_preopened(glfs_t *fs)
268 {
269 ListElement *entry = NULL;
270 ListElement *next;
271
272 if (fs == NULL) {
273 return;
274 }
275
276 QLIST_FOREACH_SAFE(entry, &glfs_list, list, next) {
277 if (entry->saved.fs == fs) {
278 if (--entry->saved.ref) {
279 return;
280 }
281
282 QLIST_REMOVE(entry, list);
283
284 glfs_fini(entry->saved.fs);
285 g_free(entry->saved.volume);
286 g_free(entry);
287 }
288 }
289 }
290
291 static int parse_volume_options(BlockdevOptionsGluster *gconf, char *path)
292 {
293 char *p, *q;
294
295 if (!path) {
296 return -EINVAL;
297 }
298
299 /* volume */
300 p = q = path + strspn(path, "/");
301 p += strcspn(p, "/");
302 if (*p == '\0') {
303 return -EINVAL;
304 }
305 gconf->volume = g_strndup(q, p - q);
306
307 /* path */
308 p += strspn(p, "/");
309 if (*p == '\0') {
310 return -EINVAL;
311 }
312 gconf->path = g_strdup(p);
313 return 0;
314 }
315
316 /*
317 * file=gluster[+transport]://[host[:port]]/volume/path[?socket=...]
318 *
319 * 'gluster' is the protocol.
320 *
321 * 'transport' specifies the transport type used to connect to gluster
322 * management daemon (glusterd). Valid transport types are
323 * tcp or unix. If a transport type isn't specified, then tcp type is assumed.
324 *
325 * 'host' specifies the host where the volume file specification for
326 * the given volume resides. This can be either hostname or ipv4 address.
327 * If transport type is 'unix', then 'host' field should not be specified.
328 * The 'socket' field needs to be populated with the path to unix domain
329 * socket.
330 *
331 * 'port' is the port number on which glusterd is listening. This is optional
332 * and if not specified, QEMU will send 0 which will make gluster to use the
333 * default port. If the transport type is unix, then 'port' should not be
334 * specified.
335 *
336 * 'volume' is the name of the gluster volume which contains the VM image.
337 *
338 * 'path' is the path to the actual VM image that resides on gluster volume.
339 *
340 * Examples:
341 *
342 * file=gluster://1.2.3.4/testvol/a.img
343 * file=gluster+tcp://1.2.3.4/testvol/a.img
344 * file=gluster+tcp://1.2.3.4:24007/testvol/dir/a.img
345 * file=gluster+tcp://host.domain.com:24007/testvol/dir/a.img
346 * file=gluster+unix:///testvol/dir/a.img?socket=/tmp/glusterd.socket
347 */
348 static int qemu_gluster_parse_uri(BlockdevOptionsGluster *gconf,
349 const char *filename)
350 {
351 SocketAddress *gsconf;
352 URI *uri;
353 QueryParams *qp = NULL;
354 bool is_unix = false;
355 int ret = 0;
356
357 uri = uri_parse(filename);
358 if (!uri) {
359 return -EINVAL;
360 }
361
362 gconf->server = g_new0(SocketAddressList, 1);
363 gconf->server->value = gsconf = g_new0(SocketAddress, 1);
364
365 /* transport */
366 if (!uri->scheme || !strcmp(uri->scheme, "gluster")) {
367 gsconf->type = SOCKET_ADDRESS_TYPE_INET;
368 } else if (!strcmp(uri->scheme, "gluster+tcp")) {
369 gsconf->type = SOCKET_ADDRESS_TYPE_INET;
370 } else if (!strcmp(uri->scheme, "gluster+unix")) {
371 gsconf->type = SOCKET_ADDRESS_TYPE_UNIX;
372 is_unix = true;
373 } else if (!strcmp(uri->scheme, "gluster+rdma")) {
374 gsconf->type = SOCKET_ADDRESS_TYPE_INET;
375 warn_report("rdma feature is not supported, falling back to tcp");
376 } else {
377 ret = -EINVAL;
378 goto out;
379 }
380
381 ret = parse_volume_options(gconf, uri->path);
382 if (ret < 0) {
383 goto out;
384 }
385
386 qp = query_params_parse(uri->query);
387 if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) {
388 ret = -EINVAL;
389 goto out;
390 }
391
392 if (is_unix) {
393 if (uri->server || uri->port) {
394 ret = -EINVAL;
395 goto out;
396 }
397 if (strcmp(qp->p[0].name, "socket")) {
398 ret = -EINVAL;
399 goto out;
400 }
401 gsconf->u.q_unix.path = g_strdup(qp->p[0].value);
402 } else {
403 gsconf->u.inet.host = g_strdup(uri->server ? uri->server : "localhost");
404 if (uri->port) {
405 gsconf->u.inet.port = g_strdup_printf("%d", uri->port);
406 } else {
407 gsconf->u.inet.port = g_strdup_printf("%d", GLUSTER_DEFAULT_PORT);
408 }
409 }
410
411 out:
412 if (qp) {
413 query_params_free(qp);
414 }
415 uri_free(uri);
416 return ret;
417 }
418
419 static struct glfs *qemu_gluster_glfs_init(BlockdevOptionsGluster *gconf,
420 Error **errp)
421 {
422 struct glfs *glfs;
423 int ret;
424 int old_errno;
425 SocketAddressList *server;
426 unsigned long long port;
427
428 glfs = glfs_find_preopened(gconf->volume);
429 if (glfs) {
430 return glfs;
431 }
432
433 glfs = glfs_new(gconf->volume);
434 if (!glfs) {
435 goto out;
436 }
437
438 glfs_set_preopened(gconf->volume, glfs);
439
440 for (server = gconf->server; server; server = server->next) {
441 switch (server->value->type) {
442 case SOCKET_ADDRESS_TYPE_UNIX:
443 ret = glfs_set_volfile_server(glfs, "unix",
444 server->value->u.q_unix.path, 0);
445 break;
446 case SOCKET_ADDRESS_TYPE_INET:
447 if (parse_uint_full(server->value->u.inet.port, &port, 10) < 0 ||
448 port > 65535) {
449 error_setg(errp, "'%s' is not a valid port number",
450 server->value->u.inet.port);
451 errno = EINVAL;
452 goto out;
453 }
454 ret = glfs_set_volfile_server(glfs, "tcp",
455 server->value->u.inet.host,
456 (int)port);
457 break;
458 case SOCKET_ADDRESS_TYPE_VSOCK:
459 case SOCKET_ADDRESS_TYPE_FD:
460 default:
461 abort();
462 }
463
464 if (ret < 0) {
465 goto out;
466 }
467 }
468
469 ret = glfs_set_logging(glfs, gconf->logfile, gconf->debug);
470 if (ret < 0) {
471 goto out;
472 }
473
474 ret = glfs_init(glfs);
475 if (ret) {
476 error_setg(errp, "Gluster connection for volume %s, path %s failed"
477 " to connect", gconf->volume, gconf->path);
478 for (server = gconf->server; server; server = server->next) {
479 if (server->value->type == SOCKET_ADDRESS_TYPE_UNIX) {
480 error_append_hint(errp, "hint: failed on socket %s ",
481 server->value->u.q_unix.path);
482 } else {
483 error_append_hint(errp, "hint: failed on host %s and port %s ",
484 server->value->u.inet.host,
485 server->value->u.inet.port);
486 }
487 }
488
489 error_append_hint(errp, "Please refer to gluster logs for more info\n");
490
491 /* glfs_init sometimes doesn't set errno although docs suggest that */
492 if (errno == 0) {
493 errno = EINVAL;
494 }
495
496 goto out;
497 }
498 return glfs;
499
500 out:
501 if (glfs) {
502 old_errno = errno;
503 glfs_clear_preopened(glfs);
504 errno = old_errno;
505 }
506 return NULL;
507 }
508
509 /*
510 * Convert the json formatted command line into qapi.
511 */
512 static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf,
513 QDict *options, Error **errp)
514 {
515 QemuOpts *opts;
516 SocketAddress *gsconf = NULL;
517 SocketAddressList *curr = NULL;
518 QDict *backing_options = NULL;
519 Error *local_err = NULL;
520 char *str = NULL;
521 const char *ptr;
522 int i, type, num_servers;
523
524 /* create opts info from runtime_json_opts list */
525 opts = qemu_opts_create(&runtime_json_opts, NULL, 0, &error_abort);
526 if (!qemu_opts_absorb_qdict(opts, options, &local_err)) {
527 goto out;
528 }
529
530 num_servers = qdict_array_entries(options, GLUSTER_OPT_SERVER_PATTERN);
531 if (num_servers < 1) {
532 error_setg(&local_err, QERR_MISSING_PARAMETER, "server");
533 goto out;
534 }
535
536 ptr = qemu_opt_get(opts, GLUSTER_OPT_VOLUME);
537 if (!ptr) {
538 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_VOLUME);
539 goto out;
540 }
541 gconf->volume = g_strdup(ptr);
542
543 ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH);
544 if (!ptr) {
545 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_PATH);
546 goto out;
547 }
548 gconf->path = g_strdup(ptr);
549 qemu_opts_del(opts);
550
551 for (i = 0; i < num_servers; i++) {
552 str = g_strdup_printf(GLUSTER_OPT_SERVER_PATTERN"%d.", i);
553 qdict_extract_subqdict(options, &backing_options, str);
554
555 /* create opts info from runtime_type_opts list */
556 opts = qemu_opts_create(&runtime_type_opts, NULL, 0, &error_abort);
557 if (!qemu_opts_absorb_qdict(opts, backing_options, &local_err)) {
558 goto out;
559 }
560
561 ptr = qemu_opt_get(opts, GLUSTER_OPT_TYPE);
562 if (!ptr) {
563 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_TYPE);
564 error_append_hint(&local_err, GERR_INDEX_HINT, i);
565 goto out;
566
567 }
568 gsconf = g_new0(SocketAddress, 1);
569 if (!strcmp(ptr, "tcp")) {
570 ptr = "inet"; /* accept legacy "tcp" */
571 }
572 type = qapi_enum_parse(&SocketAddressType_lookup, ptr, -1, NULL);
573 if (type != SOCKET_ADDRESS_TYPE_INET
574 && type != SOCKET_ADDRESS_TYPE_UNIX) {
575 error_setg(&local_err,
576 "Parameter '%s' may be 'inet' or 'unix'",
577 GLUSTER_OPT_TYPE);
578 error_append_hint(&local_err, GERR_INDEX_HINT, i);
579 goto out;
580 }
581 gsconf->type = type;
582 qemu_opts_del(opts);
583
584 if (gsconf->type == SOCKET_ADDRESS_TYPE_INET) {
585 /* create opts info from runtime_inet_opts list */
586 opts = qemu_opts_create(&runtime_inet_opts, NULL, 0, &error_abort);
587 if (!qemu_opts_absorb_qdict(opts, backing_options, &local_err)) {
588 goto out;
589 }
590
591 ptr = qemu_opt_get(opts, GLUSTER_OPT_HOST);
592 if (!ptr) {
593 error_setg(&local_err, QERR_MISSING_PARAMETER,
594 GLUSTER_OPT_HOST);
595 error_append_hint(&local_err, GERR_INDEX_HINT, i);
596 goto out;
597 }
598 gsconf->u.inet.host = g_strdup(ptr);
599 ptr = qemu_opt_get(opts, GLUSTER_OPT_PORT);
600 if (!ptr) {
601 error_setg(&local_err, QERR_MISSING_PARAMETER,
602 GLUSTER_OPT_PORT);
603 error_append_hint(&local_err, GERR_INDEX_HINT, i);
604 goto out;
605 }
606 gsconf->u.inet.port = g_strdup(ptr);
607
608 /* defend for unsupported fields in InetSocketAddress,
609 * i.e. @ipv4, @ipv6 and @to
610 */
611 ptr = qemu_opt_get(opts, GLUSTER_OPT_TO);
612 if (ptr) {
613 gsconf->u.inet.has_to = true;
614 }
615 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV4);
616 if (ptr) {
617 gsconf->u.inet.has_ipv4 = true;
618 }
619 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV6);
620 if (ptr) {
621 gsconf->u.inet.has_ipv6 = true;
622 }
623 if (gsconf->u.inet.has_to) {
624 error_setg(&local_err, "Parameter 'to' not supported");
625 goto out;
626 }
627 if (gsconf->u.inet.has_ipv4 || gsconf->u.inet.has_ipv6) {
628 error_setg(&local_err, "Parameters 'ipv4/ipv6' not supported");
629 goto out;
630 }
631 qemu_opts_del(opts);
632 } else {
633 /* create opts info from runtime_unix_opts list */
634 opts = qemu_opts_create(&runtime_unix_opts, NULL, 0, &error_abort);
635 if (!qemu_opts_absorb_qdict(opts, backing_options, &local_err)) {
636 goto out;
637 }
638
639 ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH);
640 if (!ptr) {
641 ptr = qemu_opt_get(opts, GLUSTER_OPT_SOCKET);
642 } else if (qemu_opt_get(opts, GLUSTER_OPT_SOCKET)) {
643 error_setg(&local_err,
644 "Conflicting parameters 'path' and 'socket'");
645 error_append_hint(&local_err, GERR_INDEX_HINT, i);
646 goto out;
647 }
648 if (!ptr) {
649 error_setg(&local_err, QERR_MISSING_PARAMETER,
650 GLUSTER_OPT_PATH);
651 error_append_hint(&local_err, GERR_INDEX_HINT, i);
652 goto out;
653 }
654 gsconf->u.q_unix.path = g_strdup(ptr);
655 qemu_opts_del(opts);
656 }
657
658 if (gconf->server == NULL) {
659 gconf->server = g_new0(SocketAddressList, 1);
660 gconf->server->value = gsconf;
661 curr = gconf->server;
662 } else {
663 curr->next = g_new0(SocketAddressList, 1);
664 curr->next->value = gsconf;
665 curr = curr->next;
666 }
667 gsconf = NULL;
668
669 qobject_unref(backing_options);
670 backing_options = NULL;
671 g_free(str);
672 str = NULL;
673 }
674
675 return 0;
676
677 out:
678 error_propagate(errp, local_err);
679 qapi_free_SocketAddress(gsconf);
680 qemu_opts_del(opts);
681 g_free(str);
682 qobject_unref(backing_options);
683 errno = EINVAL;
684 return -errno;
685 }
686
687 /* Converts options given in @filename and the @options QDict into the QAPI
688 * object @gconf. */
689 static int qemu_gluster_parse(BlockdevOptionsGluster *gconf,
690 const char *filename,
691 QDict *options, Error **errp)
692 {
693 int ret;
694 if (filename) {
695 ret = qemu_gluster_parse_uri(gconf, filename);
696 if (ret < 0) {
697 error_setg(errp, "invalid URI %s", filename);
698 error_append_hint(errp, "Usage: file=gluster[+transport]://"
699 "[host[:port]]volume/path[?socket=...]"
700 "[,file.debug=N]"
701 "[,file.logfile=/path/filename.log]\n");
702 return ret;
703 }
704 } else {
705 ret = qemu_gluster_parse_json(gconf, options, errp);
706 if (ret < 0) {
707 error_append_hint(errp, "Usage: "
708 "-drive driver=qcow2,file.driver=gluster,"
709 "file.volume=testvol,file.path=/path/a.qcow2"
710 "[,file.debug=9]"
711 "[,file.logfile=/path/filename.log],"
712 "file.server.0.type=inet,"
713 "file.server.0.host=1.2.3.4,"
714 "file.server.0.port=24007,"
715 "file.server.1.transport=unix,"
716 "file.server.1.path=/var/run/glusterd.socket ..."
717 "\n");
718 return ret;
719 }
720 }
721
722 return 0;
723 }
724
725 static struct glfs *qemu_gluster_init(BlockdevOptionsGluster *gconf,
726 const char *filename,
727 QDict *options, Error **errp)
728 {
729 int ret;
730
731 ret = qemu_gluster_parse(gconf, filename, options, errp);
732 if (ret < 0) {
733 errno = -ret;
734 return NULL;
735 }
736
737 return qemu_gluster_glfs_init(gconf, errp);
738 }
739
740 /*
741 * AIO callback routine called from GlusterFS thread.
742 */
743 static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret,
744 #ifdef CONFIG_GLUSTERFS_IOCB_HAS_STAT
745 struct glfs_stat *pre, struct glfs_stat *post,
746 #endif
747 void *arg)
748 {
749 GlusterAIOCB *acb = (GlusterAIOCB *)arg;
750
751 if (!ret || ret == acb->size) {
752 acb->ret = 0; /* Success */
753 } else if (ret < 0) {
754 acb->ret = -errno; /* Read/Write failed */
755 } else {
756 acb->ret = -EIO; /* Partial read/write - fail it */
757 }
758
759 aio_co_schedule(acb->aio_context, acb->coroutine);
760 }
761
762 static void qemu_gluster_parse_flags(int bdrv_flags, int *open_flags)
763 {
764 assert(open_flags != NULL);
765
766 *open_flags |= O_BINARY;
767
768 if (bdrv_flags & BDRV_O_RDWR) {
769 *open_flags |= O_RDWR;
770 } else {
771 *open_flags |= O_RDONLY;
772 }
773
774 if ((bdrv_flags & BDRV_O_NOCACHE)) {
775 *open_flags |= O_DIRECT;
776 }
777 }
778
779 /*
780 * Do SEEK_DATA/HOLE to detect if it is functional. Older broken versions of
781 * gfapi incorrectly return the current offset when SEEK_DATA/HOLE is used.
782 * - Corrected versions return -1 and set errno to EINVAL.
783 * - Versions that support SEEK_DATA/HOLE correctly, will return -1 and set
784 * errno to ENXIO when SEEK_DATA is called with a position of EOF.
785 */
786 static bool qemu_gluster_test_seek(struct glfs_fd *fd)
787 {
788 off_t ret = 0;
789
790 #if defined SEEK_HOLE && defined SEEK_DATA
791 off_t eof;
792
793 eof = glfs_lseek(fd, 0, SEEK_END);
794 if (eof < 0) {
795 /* this should never occur */
796 return false;
797 }
798
799 /* this should always fail with ENXIO if SEEK_DATA is supported */
800 ret = glfs_lseek(fd, eof, SEEK_DATA);
801 #endif
802
803 return (ret < 0) && (errno == ENXIO);
804 }
805
806 static int qemu_gluster_open(BlockDriverState *bs, QDict *options,
807 int bdrv_flags, Error **errp)
808 {
809 BDRVGlusterState *s = bs->opaque;
810 int open_flags = 0;
811 int ret = 0;
812 BlockdevOptionsGluster *gconf = NULL;
813 QemuOpts *opts;
814 const char *filename, *logfile;
815
816 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
817 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
818 ret = -EINVAL;
819 goto out;
820 }
821
822 filename = qemu_opt_get(opts, GLUSTER_OPT_FILENAME);
823
824 s->debug = qemu_opt_get_number(opts, GLUSTER_OPT_DEBUG,
825 GLUSTER_DEBUG_DEFAULT);
826 if (s->debug < 0) {
827 s->debug = 0;
828 } else if (s->debug > GLUSTER_DEBUG_MAX) {
829 s->debug = GLUSTER_DEBUG_MAX;
830 }
831
832 gconf = g_new0(BlockdevOptionsGluster, 1);
833 gconf->debug = s->debug;
834 gconf->has_debug = true;
835
836 logfile = qemu_opt_get(opts, GLUSTER_OPT_LOGFILE);
837 s->logfile = g_strdup(logfile ? logfile : GLUSTER_LOGFILE_DEFAULT);
838
839 gconf->logfile = g_strdup(s->logfile);
840 gconf->has_logfile = true;
841
842 s->glfs = qemu_gluster_init(gconf, filename, options, errp);
843 if (!s->glfs) {
844 ret = -errno;
845 goto out;
846 }
847
848 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT
849 /* Without this, if fsync fails for a recoverable reason (for instance,
850 * ENOSPC), gluster will dump its cache, preventing retries. This means
851 * almost certain data loss. Not all gluster versions support the
852 * 'resync-failed-syncs-after-fsync' key value, but there is no way to
853 * discover during runtime if it is supported (this api returns success for
854 * unknown key/value pairs) */
855 ret = glfs_set_xlator_option(s->glfs, "*-write-behind",
856 "resync-failed-syncs-after-fsync",
857 "on");
858 if (ret < 0) {
859 error_setg_errno(errp, errno, "Unable to set xlator key/value pair");
860 ret = -errno;
861 goto out;
862 }
863 #endif
864
865 qemu_gluster_parse_flags(bdrv_flags, &open_flags);
866
867 s->fd = glfs_open(s->glfs, gconf->path, open_flags);
868 ret = s->fd ? 0 : -errno;
869
870 if (ret == -EACCES || ret == -EROFS) {
871 /* Try to degrade to read-only, but if it doesn't work, still use the
872 * normal error message. */
873 if (bdrv_apply_auto_read_only(bs, NULL, NULL) == 0) {
874 open_flags = (open_flags & ~O_RDWR) | O_RDONLY;
875 s->fd = glfs_open(s->glfs, gconf->path, open_flags);
876 ret = s->fd ? 0 : -errno;
877 }
878 }
879
880 s->supports_seek_data = qemu_gluster_test_seek(s->fd);
881
882 out:
883 qemu_opts_del(opts);
884 qapi_free_BlockdevOptionsGluster(gconf);
885 if (!ret) {
886 return ret;
887 }
888 g_free(s->logfile);
889 if (s->fd) {
890 glfs_close(s->fd);
891 }
892
893 glfs_clear_preopened(s->glfs);
894
895 return ret;
896 }
897
898 static void qemu_gluster_refresh_limits(BlockDriverState *bs, Error **errp)
899 {
900 bs->bl.max_transfer = GLUSTER_MAX_TRANSFER;
901 }
902
903 static int qemu_gluster_reopen_prepare(BDRVReopenState *state,
904 BlockReopenQueue *queue, Error **errp)
905 {
906 int ret = 0;
907 BDRVGlusterState *s;
908 BDRVGlusterReopenState *reop_s;
909 BlockdevOptionsGluster *gconf;
910 int open_flags = 0;
911
912 assert(state != NULL);
913 assert(state->bs != NULL);
914
915 s = state->bs->opaque;
916
917 state->opaque = g_new0(BDRVGlusterReopenState, 1);
918 reop_s = state->opaque;
919
920 qemu_gluster_parse_flags(state->flags, &open_flags);
921
922 gconf = g_new0(BlockdevOptionsGluster, 1);
923 gconf->debug = s->debug;
924 gconf->has_debug = true;
925 gconf->logfile = g_strdup(s->logfile);
926 gconf->has_logfile = true;
927
928 /*
929 * If 'state->bs->exact_filename' is empty, 'state->options' should contain
930 * the JSON parameters already parsed.
931 */
932 if (state->bs->exact_filename[0] != '\0') {
933 reop_s->glfs = qemu_gluster_init(gconf, state->bs->exact_filename, NULL,
934 errp);
935 } else {
936 reop_s->glfs = qemu_gluster_init(gconf, NULL, state->options, errp);
937 }
938 if (reop_s->glfs == NULL) {
939 ret = -errno;
940 goto exit;
941 }
942
943 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT
944 ret = glfs_set_xlator_option(reop_s->glfs, "*-write-behind",
945 "resync-failed-syncs-after-fsync", "on");
946 if (ret < 0) {
947 error_setg_errno(errp, errno, "Unable to set xlator key/value pair");
948 ret = -errno;
949 goto exit;
950 }
951 #endif
952
953 reop_s->fd = glfs_open(reop_s->glfs, gconf->path, open_flags);
954 if (reop_s->fd == NULL) {
955 /* reops->glfs will be cleaned up in _abort */
956 ret = -errno;
957 goto exit;
958 }
959
960 exit:
961 /* state->opaque will be freed in either the _abort or _commit */
962 qapi_free_BlockdevOptionsGluster(gconf);
963 return ret;
964 }
965
966 static void qemu_gluster_reopen_commit(BDRVReopenState *state)
967 {
968 BDRVGlusterReopenState *reop_s = state->opaque;
969 BDRVGlusterState *s = state->bs->opaque;
970
971
972 /* close the old */
973 if (s->fd) {
974 glfs_close(s->fd);
975 }
976
977 glfs_clear_preopened(s->glfs);
978
979 /* use the newly opened image / connection */
980 s->fd = reop_s->fd;
981 s->glfs = reop_s->glfs;
982
983 g_free(state->opaque);
984 state->opaque = NULL;
985
986 return;
987 }
988
989
990 static void qemu_gluster_reopen_abort(BDRVReopenState *state)
991 {
992 BDRVGlusterReopenState *reop_s = state->opaque;
993
994 if (reop_s == NULL) {
995 return;
996 }
997
998 if (reop_s->fd) {
999 glfs_close(reop_s->fd);
1000 }
1001
1002 glfs_clear_preopened(reop_s->glfs);
1003
1004 g_free(state->opaque);
1005 state->opaque = NULL;
1006
1007 return;
1008 }
1009
1010 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1011 static coroutine_fn int qemu_gluster_co_pwrite_zeroes(BlockDriverState *bs,
1012 int64_t offset,
1013 int size,
1014 BdrvRequestFlags flags)
1015 {
1016 int ret;
1017 GlusterAIOCB acb;
1018 BDRVGlusterState *s = bs->opaque;
1019
1020 acb.size = size;
1021 acb.ret = 0;
1022 acb.coroutine = qemu_coroutine_self();
1023 acb.aio_context = bdrv_get_aio_context(bs);
1024
1025 ret = glfs_zerofill_async(s->fd, offset, size, gluster_finish_aiocb, &acb);
1026 if (ret < 0) {
1027 return -errno;
1028 }
1029
1030 qemu_coroutine_yield();
1031 return acb.ret;
1032 }
1033 #endif
1034
1035 static int qemu_gluster_do_truncate(struct glfs_fd *fd, int64_t offset,
1036 PreallocMode prealloc, Error **errp)
1037 {
1038 int64_t current_length;
1039
1040 current_length = glfs_lseek(fd, 0, SEEK_END);
1041 if (current_length < 0) {
1042 error_setg_errno(errp, errno, "Failed to determine current size");
1043 return -errno;
1044 }
1045
1046 if (current_length > offset && prealloc != PREALLOC_MODE_OFF) {
1047 error_setg(errp, "Cannot use preallocation for shrinking files");
1048 return -ENOTSUP;
1049 }
1050
1051 if (current_length == offset) {
1052 return 0;
1053 }
1054
1055 switch (prealloc) {
1056 #ifdef CONFIG_GLUSTERFS_FALLOCATE
1057 case PREALLOC_MODE_FALLOC:
1058 if (glfs_fallocate(fd, 0, current_length, offset - current_length)) {
1059 error_setg_errno(errp, errno, "Could not preallocate data");
1060 return -errno;
1061 }
1062 break;
1063 #endif /* CONFIG_GLUSTERFS_FALLOCATE */
1064 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1065 case PREALLOC_MODE_FULL:
1066 if (glfs_ftruncate(fd, offset)) {
1067 error_setg_errno(errp, errno, "Could not resize file");
1068 return -errno;
1069 }
1070 if (glfs_zerofill(fd, current_length, offset - current_length)) {
1071 error_setg_errno(errp, errno, "Could not zerofill the new area");
1072 return -errno;
1073 }
1074 break;
1075 #endif /* CONFIG_GLUSTERFS_ZEROFILL */
1076 case PREALLOC_MODE_OFF:
1077 if (glfs_ftruncate(fd, offset)) {
1078 error_setg_errno(errp, errno, "Could not resize file");
1079 return -errno;
1080 }
1081 break;
1082 default:
1083 error_setg(errp, "Unsupported preallocation mode: %s",
1084 PreallocMode_str(prealloc));
1085 return -EINVAL;
1086 }
1087
1088 return 0;
1089 }
1090
1091 static int qemu_gluster_co_create(BlockdevCreateOptions *options,
1092 Error **errp)
1093 {
1094 BlockdevCreateOptionsGluster *opts = &options->u.gluster;
1095 struct glfs *glfs;
1096 struct glfs_fd *fd = NULL;
1097 int ret = 0;
1098
1099 assert(options->driver == BLOCKDEV_DRIVER_GLUSTER);
1100
1101 glfs = qemu_gluster_glfs_init(opts->location, errp);
1102 if (!glfs) {
1103 ret = -errno;
1104 goto out;
1105 }
1106
1107 fd = glfs_creat(glfs, opts->location->path,
1108 O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR | S_IWUSR);
1109 if (!fd) {
1110 ret = -errno;
1111 goto out;
1112 }
1113
1114 ret = qemu_gluster_do_truncate(fd, opts->size, opts->preallocation, errp);
1115
1116 out:
1117 if (fd) {
1118 if (glfs_close(fd) != 0 && ret == 0) {
1119 ret = -errno;
1120 }
1121 }
1122 glfs_clear_preopened(glfs);
1123 return ret;
1124 }
1125
1126 static int coroutine_fn qemu_gluster_co_create_opts(BlockDriver *drv,
1127 const char *filename,
1128 QemuOpts *opts,
1129 Error **errp)
1130 {
1131 BlockdevCreateOptions *options;
1132 BlockdevCreateOptionsGluster *gopts;
1133 BlockdevOptionsGluster *gconf;
1134 char *tmp = NULL;
1135 Error *local_err = NULL;
1136 int ret;
1137
1138 options = g_new0(BlockdevCreateOptions, 1);
1139 options->driver = BLOCKDEV_DRIVER_GLUSTER;
1140 gopts = &options->u.gluster;
1141
1142 gconf = g_new0(BlockdevOptionsGluster, 1);
1143 gopts->location = gconf;
1144
1145 gopts->size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
1146 BDRV_SECTOR_SIZE);
1147
1148 tmp = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
1149 gopts->preallocation = qapi_enum_parse(&PreallocMode_lookup, tmp,
1150 PREALLOC_MODE_OFF, &local_err);
1151 g_free(tmp);
1152 if (local_err) {
1153 error_propagate(errp, local_err);
1154 ret = -EINVAL;
1155 goto fail;
1156 }
1157
1158 gconf->debug = qemu_opt_get_number_del(opts, GLUSTER_OPT_DEBUG,
1159 GLUSTER_DEBUG_DEFAULT);
1160 if (gconf->debug < 0) {
1161 gconf->debug = 0;
1162 } else if (gconf->debug > GLUSTER_DEBUG_MAX) {
1163 gconf->debug = GLUSTER_DEBUG_MAX;
1164 }
1165 gconf->has_debug = true;
1166
1167 gconf->logfile = qemu_opt_get_del(opts, GLUSTER_OPT_LOGFILE);
1168 if (!gconf->logfile) {
1169 gconf->logfile = g_strdup(GLUSTER_LOGFILE_DEFAULT);
1170 }
1171 gconf->has_logfile = true;
1172
1173 ret = qemu_gluster_parse(gconf, filename, NULL, errp);
1174 if (ret < 0) {
1175 goto fail;
1176 }
1177
1178 ret = qemu_gluster_co_create(options, errp);
1179 if (ret < 0) {
1180 goto fail;
1181 }
1182
1183 ret = 0;
1184 fail:
1185 qapi_free_BlockdevCreateOptions(options);
1186 return ret;
1187 }
1188
1189 static coroutine_fn int qemu_gluster_co_rw(BlockDriverState *bs,
1190 int64_t sector_num, int nb_sectors,
1191 QEMUIOVector *qiov, int write)
1192 {
1193 int ret;
1194 GlusterAIOCB acb;
1195 BDRVGlusterState *s = bs->opaque;
1196 size_t size = nb_sectors * BDRV_SECTOR_SIZE;
1197 off_t offset = sector_num * BDRV_SECTOR_SIZE;
1198
1199 acb.size = size;
1200 acb.ret = 0;
1201 acb.coroutine = qemu_coroutine_self();
1202 acb.aio_context = bdrv_get_aio_context(bs);
1203
1204 if (write) {
1205 ret = glfs_pwritev_async(s->fd, qiov->iov, qiov->niov, offset, 0,
1206 gluster_finish_aiocb, &acb);
1207 } else {
1208 ret = glfs_preadv_async(s->fd, qiov->iov, qiov->niov, offset, 0,
1209 gluster_finish_aiocb, &acb);
1210 }
1211
1212 if (ret < 0) {
1213 return -errno;
1214 }
1215
1216 qemu_coroutine_yield();
1217 return acb.ret;
1218 }
1219
1220 static coroutine_fn int qemu_gluster_co_truncate(BlockDriverState *bs,
1221 int64_t offset,
1222 bool exact,
1223 PreallocMode prealloc,
1224 BdrvRequestFlags flags,
1225 Error **errp)
1226 {
1227 BDRVGlusterState *s = bs->opaque;
1228 return qemu_gluster_do_truncate(s->fd, offset, prealloc, errp);
1229 }
1230
1231 static coroutine_fn int qemu_gluster_co_readv(BlockDriverState *bs,
1232 int64_t sector_num,
1233 int nb_sectors,
1234 QEMUIOVector *qiov)
1235 {
1236 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 0);
1237 }
1238
1239 static coroutine_fn int qemu_gluster_co_writev(BlockDriverState *bs,
1240 int64_t sector_num,
1241 int nb_sectors,
1242 QEMUIOVector *qiov,
1243 int flags)
1244 {
1245 assert(!flags);
1246 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 1);
1247 }
1248
1249 static void qemu_gluster_close(BlockDriverState *bs)
1250 {
1251 BDRVGlusterState *s = bs->opaque;
1252
1253 g_free(s->logfile);
1254 if (s->fd) {
1255 glfs_close(s->fd);
1256 s->fd = NULL;
1257 }
1258 glfs_clear_preopened(s->glfs);
1259 }
1260
1261 static coroutine_fn int qemu_gluster_co_flush_to_disk(BlockDriverState *bs)
1262 {
1263 int ret;
1264 GlusterAIOCB acb;
1265 BDRVGlusterState *s = bs->opaque;
1266
1267 acb.size = 0;
1268 acb.ret = 0;
1269 acb.coroutine = qemu_coroutine_self();
1270 acb.aio_context = bdrv_get_aio_context(bs);
1271
1272 ret = glfs_fsync_async(s->fd, gluster_finish_aiocb, &acb);
1273 if (ret < 0) {
1274 ret = -errno;
1275 goto error;
1276 }
1277
1278 qemu_coroutine_yield();
1279 if (acb.ret < 0) {
1280 ret = acb.ret;
1281 goto error;
1282 }
1283
1284 return acb.ret;
1285
1286 error:
1287 /* Some versions of Gluster (3.5.6 -> 3.5.8?) will not retain its cache
1288 * after a fsync failure, so we have no way of allowing the guest to safely
1289 * continue. Gluster versions prior to 3.5.6 don't retain the cache
1290 * either, but will invalidate the fd on error, so this is again our only
1291 * option.
1292 *
1293 * The 'resync-failed-syncs-after-fsync' xlator option for the
1294 * write-behind cache will cause later gluster versions to retain its
1295 * cache after error, so long as the fd remains open. However, we
1296 * currently have no way of knowing if this option is supported.
1297 *
1298 * TODO: Once gluster provides a way for us to determine if the option
1299 * is supported, bypass the closure and setting drv to NULL. */
1300 qemu_gluster_close(bs);
1301 bs->drv = NULL;
1302 return ret;
1303 }
1304
1305 #ifdef CONFIG_GLUSTERFS_DISCARD
1306 static coroutine_fn int qemu_gluster_co_pdiscard(BlockDriverState *bs,
1307 int64_t offset, int size)
1308 {
1309 int ret;
1310 GlusterAIOCB acb;
1311 BDRVGlusterState *s = bs->opaque;
1312
1313 acb.size = 0;
1314 acb.ret = 0;
1315 acb.coroutine = qemu_coroutine_self();
1316 acb.aio_context = bdrv_get_aio_context(bs);
1317
1318 ret = glfs_discard_async(s->fd, offset, size, gluster_finish_aiocb, &acb);
1319 if (ret < 0) {
1320 return -errno;
1321 }
1322
1323 qemu_coroutine_yield();
1324 return acb.ret;
1325 }
1326 #endif
1327
1328 static int64_t qemu_gluster_getlength(BlockDriverState *bs)
1329 {
1330 BDRVGlusterState *s = bs->opaque;
1331 int64_t ret;
1332
1333 ret = glfs_lseek(s->fd, 0, SEEK_END);
1334 if (ret < 0) {
1335 return -errno;
1336 } else {
1337 return ret;
1338 }
1339 }
1340
1341 static int64_t qemu_gluster_allocated_file_size(BlockDriverState *bs)
1342 {
1343 BDRVGlusterState *s = bs->opaque;
1344 struct stat st;
1345 int ret;
1346
1347 ret = glfs_fstat(s->fd, &st);
1348 if (ret < 0) {
1349 return -errno;
1350 } else {
1351 return st.st_blocks * 512;
1352 }
1353 }
1354
1355 /*
1356 * Find allocation range in @bs around offset @start.
1357 * May change underlying file descriptor's file offset.
1358 * If @start is not in a hole, store @start in @data, and the
1359 * beginning of the next hole in @hole, and return 0.
1360 * If @start is in a non-trailing hole, store @start in @hole and the
1361 * beginning of the next non-hole in @data, and return 0.
1362 * If @start is in a trailing hole or beyond EOF, return -ENXIO.
1363 * If we can't find out, return a negative errno other than -ENXIO.
1364 *
1365 * (Shamefully copied from file-posix.c, only minuscule adaptions.)
1366 */
1367 static int find_allocation(BlockDriverState *bs, off_t start,
1368 off_t *data, off_t *hole)
1369 {
1370 BDRVGlusterState *s = bs->opaque;
1371
1372 if (!s->supports_seek_data) {
1373 goto exit;
1374 }
1375
1376 #if defined SEEK_HOLE && defined SEEK_DATA
1377 off_t offs;
1378
1379 /*
1380 * SEEK_DATA cases:
1381 * D1. offs == start: start is in data
1382 * D2. offs > start: start is in a hole, next data at offs
1383 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole
1384 * or start is beyond EOF
1385 * If the latter happens, the file has been truncated behind
1386 * our back since we opened it. All bets are off then.
1387 * Treating like a trailing hole is simplest.
1388 * D4. offs < 0, errno != ENXIO: we learned nothing
1389 */
1390 offs = glfs_lseek(s->fd, start, SEEK_DATA);
1391 if (offs < 0) {
1392 return -errno; /* D3 or D4 */
1393 }
1394
1395 if (offs < start) {
1396 /* This is not a valid return by lseek(). We are safe to just return
1397 * -EIO in this case, and we'll treat it like D4. Unfortunately some
1398 * versions of gluster server will return offs < start, so an assert
1399 * here will unnecessarily abort QEMU. */
1400 return -EIO;
1401 }
1402
1403 if (offs > start) {
1404 /* D2: in hole, next data at offs */
1405 *hole = start;
1406 *data = offs;
1407 return 0;
1408 }
1409
1410 /* D1: in data, end not yet known */
1411
1412 /*
1413 * SEEK_HOLE cases:
1414 * H1. offs == start: start is in a hole
1415 * If this happens here, a hole has been dug behind our back
1416 * since the previous lseek().
1417 * H2. offs > start: either start is in data, next hole at offs,
1418 * or start is in trailing hole, EOF at offs
1419 * Linux treats trailing holes like any other hole: offs ==
1420 * start. Solaris seeks to EOF instead: offs > start (blech).
1421 * If that happens here, a hole has been dug behind our back
1422 * since the previous lseek().
1423 * H3. offs < 0, errno = ENXIO: start is beyond EOF
1424 * If this happens, the file has been truncated behind our
1425 * back since we opened it. Treat it like a trailing hole.
1426 * H4. offs < 0, errno != ENXIO: we learned nothing
1427 * Pretend we know nothing at all, i.e. "forget" about D1.
1428 */
1429 offs = glfs_lseek(s->fd, start, SEEK_HOLE);
1430 if (offs < 0) {
1431 return -errno; /* D1 and (H3 or H4) */
1432 }
1433
1434 if (offs < start) {
1435 /* This is not a valid return by lseek(). We are safe to just return
1436 * -EIO in this case, and we'll treat it like H4. Unfortunately some
1437 * versions of gluster server will return offs < start, so an assert
1438 * here will unnecessarily abort QEMU. */
1439 return -EIO;
1440 }
1441
1442 if (offs > start) {
1443 /*
1444 * D1 and H2: either in data, next hole at offs, or it was in
1445 * data but is now in a trailing hole. In the latter case,
1446 * all bets are off. Treating it as if it there was data all
1447 * the way to EOF is safe, so simply do that.
1448 */
1449 *data = start;
1450 *hole = offs;
1451 return 0;
1452 }
1453
1454 /* D1 and H1 */
1455 return -EBUSY;
1456 #endif
1457
1458 exit:
1459 return -ENOTSUP;
1460 }
1461
1462 /*
1463 * Returns the allocation status of the specified offset.
1464 *
1465 * The block layer guarantees 'offset' and 'bytes' are within bounds.
1466 *
1467 * 'pnum' is set to the number of bytes (including and immediately following
1468 * the specified offset) that are known to be in the same
1469 * allocated/unallocated state.
1470 *
1471 * 'bytes' is the max value 'pnum' should be set to.
1472 *
1473 * (Based on raw_co_block_status() from file-posix.c.)
1474 */
1475 static int coroutine_fn qemu_gluster_co_block_status(BlockDriverState *bs,
1476 bool want_zero,
1477 int64_t offset,
1478 int64_t bytes,
1479 int64_t *pnum,
1480 int64_t *map,
1481 BlockDriverState **file)
1482 {
1483 BDRVGlusterState *s = bs->opaque;
1484 off_t data = 0, hole = 0;
1485 int ret = -EINVAL;
1486
1487 if (!s->fd) {
1488 return ret;
1489 }
1490
1491 if (!want_zero) {
1492 *pnum = bytes;
1493 *map = offset;
1494 *file = bs;
1495 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
1496 }
1497
1498 ret = find_allocation(bs, offset, &data, &hole);
1499 if (ret == -ENXIO) {
1500 /* Trailing hole */
1501 *pnum = bytes;
1502 ret = BDRV_BLOCK_ZERO;
1503 } else if (ret < 0) {
1504 /* No info available, so pretend there are no holes */
1505 *pnum = bytes;
1506 ret = BDRV_BLOCK_DATA;
1507 } else if (data == offset) {
1508 /* On a data extent, compute bytes to the end of the extent,
1509 * possibly including a partial sector at EOF. */
1510 *pnum = MIN(bytes, hole - offset);
1511 ret = BDRV_BLOCK_DATA;
1512 } else {
1513 /* On a hole, compute bytes to the beginning of the next extent. */
1514 assert(hole == offset);
1515 *pnum = MIN(bytes, data - offset);
1516 ret = BDRV_BLOCK_ZERO;
1517 }
1518
1519 *map = offset;
1520 *file = bs;
1521
1522 return ret | BDRV_BLOCK_OFFSET_VALID;
1523 }
1524
1525
1526 static const char *const gluster_strong_open_opts[] = {
1527 GLUSTER_OPT_VOLUME,
1528 GLUSTER_OPT_PATH,
1529 GLUSTER_OPT_TYPE,
1530 GLUSTER_OPT_SERVER_PATTERN,
1531 GLUSTER_OPT_HOST,
1532 GLUSTER_OPT_PORT,
1533 GLUSTER_OPT_TO,
1534 GLUSTER_OPT_IPV4,
1535 GLUSTER_OPT_IPV6,
1536 GLUSTER_OPT_SOCKET,
1537
1538 NULL
1539 };
1540
1541 static BlockDriver bdrv_gluster = {
1542 .format_name = "gluster",
1543 .protocol_name = "gluster",
1544 .instance_size = sizeof(BDRVGlusterState),
1545 .bdrv_needs_filename = false,
1546 .bdrv_file_open = qemu_gluster_open,
1547 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1548 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1549 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1550 .bdrv_close = qemu_gluster_close,
1551 .bdrv_co_create = qemu_gluster_co_create,
1552 .bdrv_co_create_opts = qemu_gluster_co_create_opts,
1553 .bdrv_getlength = qemu_gluster_getlength,
1554 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
1555 .bdrv_co_truncate = qemu_gluster_co_truncate,
1556 .bdrv_co_readv = qemu_gluster_co_readv,
1557 .bdrv_co_writev = qemu_gluster_co_writev,
1558 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1559 #ifdef CONFIG_GLUSTERFS_DISCARD
1560 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1561 #endif
1562 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1563 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1564 #endif
1565 .bdrv_co_block_status = qemu_gluster_co_block_status,
1566 .bdrv_refresh_limits = qemu_gluster_refresh_limits,
1567 .create_opts = &qemu_gluster_create_opts,
1568 .strong_runtime_opts = gluster_strong_open_opts,
1569 };
1570
1571 static BlockDriver bdrv_gluster_tcp = {
1572 .format_name = "gluster",
1573 .protocol_name = "gluster+tcp",
1574 .instance_size = sizeof(BDRVGlusterState),
1575 .bdrv_needs_filename = false,
1576 .bdrv_file_open = qemu_gluster_open,
1577 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1578 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1579 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1580 .bdrv_close = qemu_gluster_close,
1581 .bdrv_co_create = qemu_gluster_co_create,
1582 .bdrv_co_create_opts = qemu_gluster_co_create_opts,
1583 .bdrv_getlength = qemu_gluster_getlength,
1584 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
1585 .bdrv_co_truncate = qemu_gluster_co_truncate,
1586 .bdrv_co_readv = qemu_gluster_co_readv,
1587 .bdrv_co_writev = qemu_gluster_co_writev,
1588 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1589 #ifdef CONFIG_GLUSTERFS_DISCARD
1590 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1591 #endif
1592 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1593 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1594 #endif
1595 .bdrv_co_block_status = qemu_gluster_co_block_status,
1596 .bdrv_refresh_limits = qemu_gluster_refresh_limits,
1597 .create_opts = &qemu_gluster_create_opts,
1598 .strong_runtime_opts = gluster_strong_open_opts,
1599 };
1600
1601 static BlockDriver bdrv_gluster_unix = {
1602 .format_name = "gluster",
1603 .protocol_name = "gluster+unix",
1604 .instance_size = sizeof(BDRVGlusterState),
1605 .bdrv_needs_filename = true,
1606 .bdrv_file_open = qemu_gluster_open,
1607 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1608 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1609 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1610 .bdrv_close = qemu_gluster_close,
1611 .bdrv_co_create = qemu_gluster_co_create,
1612 .bdrv_co_create_opts = qemu_gluster_co_create_opts,
1613 .bdrv_getlength = qemu_gluster_getlength,
1614 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
1615 .bdrv_co_truncate = qemu_gluster_co_truncate,
1616 .bdrv_co_readv = qemu_gluster_co_readv,
1617 .bdrv_co_writev = qemu_gluster_co_writev,
1618 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1619 #ifdef CONFIG_GLUSTERFS_DISCARD
1620 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1621 #endif
1622 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1623 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1624 #endif
1625 .bdrv_co_block_status = qemu_gluster_co_block_status,
1626 .bdrv_refresh_limits = qemu_gluster_refresh_limits,
1627 .create_opts = &qemu_gluster_create_opts,
1628 .strong_runtime_opts = gluster_strong_open_opts,
1629 };
1630
1631 /* rdma is deprecated (actually never supported for volfile fetch).
1632 * Let's maintain it for the protocol compatibility, to make sure things
1633 * won't break immediately. For now, gluster+rdma will fall back to gluster+tcp
1634 * protocol with a warning.
1635 * TODO: remove gluster+rdma interface support
1636 */
1637 static BlockDriver bdrv_gluster_rdma = {
1638 .format_name = "gluster",
1639 .protocol_name = "gluster+rdma",
1640 .instance_size = sizeof(BDRVGlusterState),
1641 .bdrv_needs_filename = true,
1642 .bdrv_file_open = qemu_gluster_open,
1643 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1644 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1645 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1646 .bdrv_close = qemu_gluster_close,
1647 .bdrv_co_create = qemu_gluster_co_create,
1648 .bdrv_co_create_opts = qemu_gluster_co_create_opts,
1649 .bdrv_getlength = qemu_gluster_getlength,
1650 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
1651 .bdrv_co_truncate = qemu_gluster_co_truncate,
1652 .bdrv_co_readv = qemu_gluster_co_readv,
1653 .bdrv_co_writev = qemu_gluster_co_writev,
1654 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1655 #ifdef CONFIG_GLUSTERFS_DISCARD
1656 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1657 #endif
1658 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1659 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1660 #endif
1661 .bdrv_co_block_status = qemu_gluster_co_block_status,
1662 .bdrv_refresh_limits = qemu_gluster_refresh_limits,
1663 .create_opts = &qemu_gluster_create_opts,
1664 .strong_runtime_opts = gluster_strong_open_opts,
1665 };
1666
1667 static void bdrv_gluster_init(void)
1668 {
1669 bdrv_register(&bdrv_gluster_rdma);
1670 bdrv_register(&bdrv_gluster_unix);
1671 bdrv_register(&bdrv_gluster_tcp);
1672 bdrv_register(&bdrv_gluster);
1673 }
1674
1675 block_init(bdrv_gluster_init);