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-io.h"
15 #include "block/block_int.h"
16 #include "block/qdict.h"
17 #include "qapi/error.h"
18 #include "qapi/qmp/qdict.h"
19 #include "qapi/qmp/qerror.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
glfs_set_preopened(const char * volume,glfs_t * fs)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
glfs_find_preopened(const char * volume)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
glfs_clear_preopened(glfs_t * fs)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
parse_volume_options(BlockdevOptionsGluster * gconf,const char * path)291 static int parse_volume_options(BlockdevOptionsGluster *gconf, const char *path)
292 {
293 const 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 */
qemu_gluster_parse_uri(BlockdevOptionsGluster * gconf,const char * filename)348 static int qemu_gluster_parse_uri(BlockdevOptionsGluster *gconf,
349 const char *filename)
350 {
351 g_autoptr(GUri) uri = g_uri_parse(filename, G_URI_FLAGS_NONE, NULL);
352 g_autoptr(GHashTable) qp = NULL;
353 SocketAddress *gsconf;
354 bool is_unix = false;
355 const char *uri_scheme, *uri_query, *uri_server;
356 int uri_port, ret;
357
358 if (!uri) {
359 return -EINVAL;
360 }
361
362 gsconf = g_new0(SocketAddress, 1);
363 QAPI_LIST_PREPEND(gconf->server, gsconf);
364
365 /* transport */
366 uri_scheme = g_uri_get_scheme(uri);
367 if (!uri_scheme || !strcmp(uri_scheme, "gluster")) {
368 gsconf->type = SOCKET_ADDRESS_TYPE_INET;
369 } else if (!strcmp(uri_scheme, "gluster+tcp")) {
370 gsconf->type = SOCKET_ADDRESS_TYPE_INET;
371 } else if (!strcmp(uri_scheme, "gluster+unix")) {
372 gsconf->type = SOCKET_ADDRESS_TYPE_UNIX;
373 is_unix = true;
374 } else {
375 return -EINVAL;
376 }
377
378 ret = parse_volume_options(gconf, g_uri_get_path(uri));
379 if (ret < 0) {
380 return ret;
381 }
382
383 uri_query = g_uri_get_query(uri);
384 if (uri_query) {
385 qp = g_uri_parse_params(uri_query, -1, "&", G_URI_PARAMS_NONE, NULL);
386 if (!qp) {
387 return -EINVAL;
388 }
389 ret = g_hash_table_size(qp);
390 if (ret > 1 || (is_unix && !ret) || (!is_unix && ret)) {
391 return -EINVAL;
392 }
393 }
394
395 uri_server = g_uri_get_host(uri);
396 uri_port = g_uri_get_port(uri);
397
398 if (is_unix) {
399 char *uri_socket = g_hash_table_lookup(qp, "socket");
400 if (uri_server || uri_port != -1 || !uri_socket) {
401 return -EINVAL;
402 }
403 gsconf->u.q_unix.path = g_strdup(uri_socket);
404 } else {
405 gsconf->u.inet.host = g_strdup(uri_server ? uri_server : "localhost");
406 if (uri_port > 0) {
407 gsconf->u.inet.port = g_strdup_printf("%d", uri_port);
408 } else {
409 gsconf->u.inet.port = g_strdup_printf("%d", GLUSTER_DEFAULT_PORT);
410 }
411 }
412
413 return 0;
414 }
415
qemu_gluster_glfs_init(BlockdevOptionsGluster * gconf,Error ** errp)416 static struct glfs *qemu_gluster_glfs_init(BlockdevOptionsGluster *gconf,
417 Error **errp)
418 {
419 struct glfs *glfs;
420 int ret;
421 int old_errno;
422 SocketAddressList *server;
423 uint64_t port;
424
425 glfs = glfs_find_preopened(gconf->volume);
426 if (glfs) {
427 return glfs;
428 }
429
430 glfs = glfs_new(gconf->volume);
431 if (!glfs) {
432 goto out;
433 }
434
435 glfs_set_preopened(gconf->volume, glfs);
436
437 for (server = gconf->server; server; server = server->next) {
438 switch (server->value->type) {
439 case SOCKET_ADDRESS_TYPE_UNIX:
440 ret = glfs_set_volfile_server(glfs, "unix",
441 server->value->u.q_unix.path, 0);
442 break;
443 case SOCKET_ADDRESS_TYPE_INET:
444 if (parse_uint_full(server->value->u.inet.port, 10, &port) < 0 ||
445 port > 65535) {
446 error_setg(errp, "'%s' is not a valid port number",
447 server->value->u.inet.port);
448 errno = EINVAL;
449 goto out;
450 }
451 ret = glfs_set_volfile_server(glfs, "tcp",
452 server->value->u.inet.host,
453 (int)port);
454 break;
455 case SOCKET_ADDRESS_TYPE_VSOCK:
456 case SOCKET_ADDRESS_TYPE_FD:
457 default:
458 abort();
459 }
460
461 if (ret < 0) {
462 goto out;
463 }
464 }
465
466 ret = glfs_set_logging(glfs, gconf->logfile, gconf->debug);
467 if (ret < 0) {
468 goto out;
469 }
470
471 ret = glfs_init(glfs);
472 if (ret) {
473 error_setg(errp, "Gluster connection for volume %s, path %s failed"
474 " to connect", gconf->volume, gconf->path);
475 for (server = gconf->server; server; server = server->next) {
476 if (server->value->type == SOCKET_ADDRESS_TYPE_UNIX) {
477 error_append_hint(errp, "hint: failed on socket %s ",
478 server->value->u.q_unix.path);
479 } else {
480 error_append_hint(errp, "hint: failed on host %s and port %s ",
481 server->value->u.inet.host,
482 server->value->u.inet.port);
483 }
484 }
485
486 error_append_hint(errp, "Please refer to gluster logs for more info\n");
487
488 /* glfs_init sometimes doesn't set errno although docs suggest that */
489 if (errno == 0) {
490 errno = EINVAL;
491 }
492
493 goto out;
494 }
495 return glfs;
496
497 out:
498 if (glfs) {
499 old_errno = errno;
500 glfs_clear_preopened(glfs);
501 errno = old_errno;
502 }
503 return NULL;
504 }
505
506 /*
507 * Convert the json formatted command line into qapi.
508 */
qemu_gluster_parse_json(BlockdevOptionsGluster * gconf,QDict * options,Error ** errp)509 static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf,
510 QDict *options, Error **errp)
511 {
512 QemuOpts *opts;
513 SocketAddress *gsconf = NULL;
514 SocketAddressList **tail;
515 QDict *backing_options = NULL;
516 Error *local_err = NULL;
517 char *str = NULL;
518 const char *ptr;
519 int i, type, num_servers;
520
521 /* create opts info from runtime_json_opts list */
522 opts = qemu_opts_create(&runtime_json_opts, NULL, 0, &error_abort);
523 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
524 goto out;
525 }
526
527 num_servers = qdict_array_entries(options, GLUSTER_OPT_SERVER_PATTERN);
528 if (num_servers < 1) {
529 error_setg(&local_err, QERR_MISSING_PARAMETER, "server");
530 goto out;
531 }
532
533 ptr = qemu_opt_get(opts, GLUSTER_OPT_VOLUME);
534 if (!ptr) {
535 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_VOLUME);
536 goto out;
537 }
538 gconf->volume = g_strdup(ptr);
539
540 ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH);
541 if (!ptr) {
542 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_PATH);
543 goto out;
544 }
545 gconf->path = g_strdup(ptr);
546 qemu_opts_del(opts);
547 tail = &gconf->server;
548
549 for (i = 0; i < num_servers; i++) {
550 str = g_strdup_printf(GLUSTER_OPT_SERVER_PATTERN"%d.", i);
551 qdict_extract_subqdict(options, &backing_options, str);
552
553 /* create opts info from runtime_type_opts list */
554 opts = qemu_opts_create(&runtime_type_opts, NULL, 0, &error_abort);
555 if (!qemu_opts_absorb_qdict(opts, backing_options, errp)) {
556 goto out;
557 }
558
559 ptr = qemu_opt_get(opts, GLUSTER_OPT_TYPE);
560 if (!ptr) {
561 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_TYPE);
562 error_append_hint(&local_err, GERR_INDEX_HINT, i);
563 goto out;
564
565 }
566 gsconf = g_new0(SocketAddress, 1);
567 if (!strcmp(ptr, "tcp")) {
568 ptr = "inet"; /* accept legacy "tcp" */
569 }
570 type = qapi_enum_parse(&SocketAddressType_lookup, ptr, -1, NULL);
571 if (type != SOCKET_ADDRESS_TYPE_INET
572 && type != SOCKET_ADDRESS_TYPE_UNIX) {
573 error_setg(&local_err,
574 "Parameter '%s' may be 'inet' or 'unix'",
575 GLUSTER_OPT_TYPE);
576 error_append_hint(&local_err, GERR_INDEX_HINT, i);
577 goto out;
578 }
579 gsconf->type = type;
580 qemu_opts_del(opts);
581
582 if (gsconf->type == SOCKET_ADDRESS_TYPE_INET) {
583 /* create opts info from runtime_inet_opts list */
584 opts = qemu_opts_create(&runtime_inet_opts, NULL, 0, &error_abort);
585 if (!qemu_opts_absorb_qdict(opts, backing_options, errp)) {
586 goto out;
587 }
588
589 ptr = qemu_opt_get(opts, GLUSTER_OPT_HOST);
590 if (!ptr) {
591 error_setg(&local_err, QERR_MISSING_PARAMETER,
592 GLUSTER_OPT_HOST);
593 error_append_hint(&local_err, GERR_INDEX_HINT, i);
594 goto out;
595 }
596 gsconf->u.inet.host = g_strdup(ptr);
597 ptr = qemu_opt_get(opts, GLUSTER_OPT_PORT);
598 if (!ptr) {
599 error_setg(&local_err, QERR_MISSING_PARAMETER,
600 GLUSTER_OPT_PORT);
601 error_append_hint(&local_err, GERR_INDEX_HINT, i);
602 goto out;
603 }
604 gsconf->u.inet.port = g_strdup(ptr);
605
606 /* defend for unsupported fields in InetSocketAddress,
607 * i.e. @ipv4, @ipv6 and @to
608 */
609 ptr = qemu_opt_get(opts, GLUSTER_OPT_TO);
610 if (ptr) {
611 gsconf->u.inet.has_to = true;
612 }
613 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV4);
614 if (ptr) {
615 gsconf->u.inet.has_ipv4 = true;
616 }
617 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV6);
618 if (ptr) {
619 gsconf->u.inet.has_ipv6 = true;
620 }
621 if (gsconf->u.inet.has_to) {
622 error_setg(&local_err, "Parameter 'to' not supported");
623 goto out;
624 }
625 if (gsconf->u.inet.has_ipv4 || gsconf->u.inet.has_ipv6) {
626 error_setg(&local_err, "Parameters 'ipv4/ipv6' not supported");
627 goto out;
628 }
629 qemu_opts_del(opts);
630 } else {
631 /* create opts info from runtime_unix_opts list */
632 opts = qemu_opts_create(&runtime_unix_opts, NULL, 0, &error_abort);
633 if (!qemu_opts_absorb_qdict(opts, backing_options, errp)) {
634 goto out;
635 }
636
637 ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH);
638 if (!ptr) {
639 ptr = qemu_opt_get(opts, GLUSTER_OPT_SOCKET);
640 } else if (qemu_opt_get(opts, GLUSTER_OPT_SOCKET)) {
641 error_setg(&local_err,
642 "Conflicting parameters 'path' and 'socket'");
643 error_append_hint(&local_err, GERR_INDEX_HINT, i);
644 goto out;
645 }
646 if (!ptr) {
647 error_setg(&local_err, QERR_MISSING_PARAMETER,
648 GLUSTER_OPT_PATH);
649 error_append_hint(&local_err, GERR_INDEX_HINT, i);
650 goto out;
651 }
652 gsconf->u.q_unix.path = g_strdup(ptr);
653 qemu_opts_del(opts);
654 }
655
656 QAPI_LIST_APPEND(tail, gsconf);
657 gsconf = NULL;
658
659 qobject_unref(backing_options);
660 backing_options = NULL;
661 g_free(str);
662 str = NULL;
663 }
664
665 return 0;
666
667 out:
668 error_propagate(errp, local_err);
669 qapi_free_SocketAddress(gsconf);
670 qemu_opts_del(opts);
671 g_free(str);
672 qobject_unref(backing_options);
673 errno = EINVAL;
674 return -errno;
675 }
676
677 /* Converts options given in @filename and the @options QDict into the QAPI
678 * object @gconf. */
qemu_gluster_parse(BlockdevOptionsGluster * gconf,const char * filename,QDict * options,Error ** errp)679 static int qemu_gluster_parse(BlockdevOptionsGluster *gconf,
680 const char *filename,
681 QDict *options, Error **errp)
682 {
683 int ret;
684 if (filename) {
685 ret = qemu_gluster_parse_uri(gconf, filename);
686 if (ret < 0) {
687 error_setg(errp, "invalid URI %s", filename);
688 error_append_hint(errp, "Usage: file=gluster[+transport]://"
689 "[host[:port]]volume/path[?socket=...]"
690 "[,file.debug=N]"
691 "[,file.logfile=/path/filename.log]\n");
692 return ret;
693 }
694 } else {
695 ret = qemu_gluster_parse_json(gconf, options, errp);
696 if (ret < 0) {
697 error_append_hint(errp, "Usage: "
698 "-drive driver=qcow2,file.driver=gluster,"
699 "file.volume=testvol,file.path=/path/a.qcow2"
700 "[,file.debug=9]"
701 "[,file.logfile=/path/filename.log],"
702 "file.server.0.type=inet,"
703 "file.server.0.host=1.2.3.4,"
704 "file.server.0.port=24007,"
705 "file.server.1.transport=unix,"
706 "file.server.1.path=/var/run/glusterd.socket ..."
707 "\n");
708 return ret;
709 }
710 }
711
712 return 0;
713 }
714
qemu_gluster_init(BlockdevOptionsGluster * gconf,const char * filename,QDict * options,Error ** errp)715 static struct glfs *qemu_gluster_init(BlockdevOptionsGluster *gconf,
716 const char *filename,
717 QDict *options, Error **errp)
718 {
719 int ret;
720
721 ret = qemu_gluster_parse(gconf, filename, options, errp);
722 if (ret < 0) {
723 errno = -ret;
724 return NULL;
725 }
726
727 return qemu_gluster_glfs_init(gconf, errp);
728 }
729
730 /*
731 * AIO callback routine called from GlusterFS thread.
732 */
gluster_finish_aiocb(struct glfs_fd * fd,ssize_t ret,struct glfs_stat * pre,struct glfs_stat * post,void * arg)733 static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret,
734 #ifdef CONFIG_GLUSTERFS_IOCB_HAS_STAT
735 struct glfs_stat *pre, struct glfs_stat *post,
736 #endif
737 void *arg)
738 {
739 GlusterAIOCB *acb = (GlusterAIOCB *)arg;
740
741 if (!ret || ret == acb->size) {
742 acb->ret = 0; /* Success */
743 } else if (ret < 0) {
744 acb->ret = -errno; /* Read/Write failed */
745 } else {
746 acb->ret = -EIO; /* Partial read/write - fail it */
747 }
748
749 aio_co_schedule(acb->aio_context, acb->coroutine);
750 }
751
qemu_gluster_parse_flags(int bdrv_flags,int * open_flags)752 static void qemu_gluster_parse_flags(int bdrv_flags, int *open_flags)
753 {
754 assert(open_flags != NULL);
755
756 *open_flags |= O_BINARY;
757
758 if (bdrv_flags & BDRV_O_RDWR) {
759 *open_flags |= O_RDWR;
760 } else {
761 *open_flags |= O_RDONLY;
762 }
763
764 if ((bdrv_flags & BDRV_O_NOCACHE)) {
765 *open_flags |= O_DIRECT;
766 }
767 }
768
769 /*
770 * Do SEEK_DATA/HOLE to detect if it is functional. Older broken versions of
771 * gfapi incorrectly return the current offset when SEEK_DATA/HOLE is used.
772 * - Corrected versions return -1 and set errno to EINVAL.
773 * - Versions that support SEEK_DATA/HOLE correctly, will return -1 and set
774 * errno to ENXIO when SEEK_DATA is called with a position of EOF.
775 */
qemu_gluster_test_seek(struct glfs_fd * fd)776 static bool qemu_gluster_test_seek(struct glfs_fd *fd)
777 {
778 off_t ret = 0;
779
780 #if defined SEEK_HOLE && defined SEEK_DATA
781 off_t eof;
782
783 eof = glfs_lseek(fd, 0, SEEK_END);
784 if (eof < 0) {
785 /* this should never occur */
786 return false;
787 }
788
789 /* this should always fail with ENXIO if SEEK_DATA is supported */
790 ret = glfs_lseek(fd, eof, SEEK_DATA);
791 #endif
792
793 return (ret < 0) && (errno == ENXIO);
794 }
795
qemu_gluster_open(BlockDriverState * bs,QDict * options,int bdrv_flags,Error ** errp)796 static int qemu_gluster_open(BlockDriverState *bs, QDict *options,
797 int bdrv_flags, Error **errp)
798 {
799 BDRVGlusterState *s = bs->opaque;
800 int open_flags = 0;
801 int ret = 0;
802 BlockdevOptionsGluster *gconf = NULL;
803 QemuOpts *opts;
804 const char *filename, *logfile;
805
806 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
807 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
808 ret = -EINVAL;
809 goto out;
810 }
811
812 filename = qemu_opt_get(opts, GLUSTER_OPT_FILENAME);
813
814 s->debug = qemu_opt_get_number(opts, GLUSTER_OPT_DEBUG,
815 GLUSTER_DEBUG_DEFAULT);
816 if (s->debug < 0) {
817 s->debug = 0;
818 } else if (s->debug > GLUSTER_DEBUG_MAX) {
819 s->debug = GLUSTER_DEBUG_MAX;
820 }
821
822 gconf = g_new0(BlockdevOptionsGluster, 1);
823 gconf->debug = s->debug;
824 gconf->has_debug = true;
825
826 logfile = qemu_opt_get(opts, GLUSTER_OPT_LOGFILE);
827 s->logfile = g_strdup(logfile ? logfile : GLUSTER_LOGFILE_DEFAULT);
828
829 gconf->logfile = g_strdup(s->logfile);
830
831 s->glfs = qemu_gluster_init(gconf, filename, options, errp);
832 if (!s->glfs) {
833 ret = -errno;
834 goto out;
835 }
836
837 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT
838 /* Without this, if fsync fails for a recoverable reason (for instance,
839 * ENOSPC), gluster will dump its cache, preventing retries. This means
840 * almost certain data loss. Not all gluster versions support the
841 * 'resync-failed-syncs-after-fsync' key value, but there is no way to
842 * discover during runtime if it is supported (this api returns success for
843 * unknown key/value pairs) */
844 ret = glfs_set_xlator_option(s->glfs, "*-write-behind",
845 "resync-failed-syncs-after-fsync",
846 "on");
847 if (ret < 0) {
848 error_setg_errno(errp, errno, "Unable to set xlator key/value pair");
849 ret = -errno;
850 goto out;
851 }
852 #endif
853
854 qemu_gluster_parse_flags(bdrv_flags, &open_flags);
855
856 s->fd = glfs_open(s->glfs, gconf->path, open_flags);
857 ret = s->fd ? 0 : -errno;
858
859 if (ret == -EACCES || ret == -EROFS) {
860 /* Try to degrade to read-only, but if it doesn't work, still use the
861 * normal error message. */
862 bdrv_graph_rdlock_main_loop();
863 if (bdrv_apply_auto_read_only(bs, NULL, NULL) == 0) {
864 open_flags = (open_flags & ~O_RDWR) | O_RDONLY;
865 s->fd = glfs_open(s->glfs, gconf->path, open_flags);
866 ret = s->fd ? 0 : -errno;
867 }
868 bdrv_graph_rdunlock_main_loop();
869 }
870
871 s->supports_seek_data = qemu_gluster_test_seek(s->fd);
872
873 out:
874 qemu_opts_del(opts);
875 qapi_free_BlockdevOptionsGluster(gconf);
876 if (!ret) {
877 return ret;
878 }
879 g_free(s->logfile);
880 if (s->fd) {
881 glfs_close(s->fd);
882 }
883
884 glfs_clear_preopened(s->glfs);
885
886 return ret;
887 }
888
qemu_gluster_refresh_limits(BlockDriverState * bs,Error ** errp)889 static void qemu_gluster_refresh_limits(BlockDriverState *bs, Error **errp)
890 {
891 bs->bl.max_transfer = GLUSTER_MAX_TRANSFER;
892 bs->bl.max_pdiscard = MIN(SIZE_MAX, INT64_MAX);
893 }
894
qemu_gluster_reopen_prepare(BDRVReopenState * state,BlockReopenQueue * queue,Error ** errp)895 static int qemu_gluster_reopen_prepare(BDRVReopenState *state,
896 BlockReopenQueue *queue, Error **errp)
897 {
898 int ret = 0;
899 BDRVGlusterState *s;
900 BDRVGlusterReopenState *reop_s;
901 BlockdevOptionsGluster *gconf;
902 int open_flags = 0;
903
904 assert(state != NULL);
905 assert(state->bs != NULL);
906
907 s = state->bs->opaque;
908
909 state->opaque = g_new0(BDRVGlusterReopenState, 1);
910 reop_s = state->opaque;
911
912 qemu_gluster_parse_flags(state->flags, &open_flags);
913
914 gconf = g_new0(BlockdevOptionsGluster, 1);
915 gconf->debug = s->debug;
916 gconf->has_debug = true;
917 gconf->logfile = g_strdup(s->logfile);
918
919 /*
920 * If 'state->bs->exact_filename' is empty, 'state->options' should contain
921 * the JSON parameters already parsed.
922 */
923 if (state->bs->exact_filename[0] != '\0') {
924 reop_s->glfs = qemu_gluster_init(gconf, state->bs->exact_filename, NULL,
925 errp);
926 } else {
927 reop_s->glfs = qemu_gluster_init(gconf, NULL, state->options, errp);
928 }
929 if (reop_s->glfs == NULL) {
930 ret = -errno;
931 goto exit;
932 }
933
934 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT
935 ret = glfs_set_xlator_option(reop_s->glfs, "*-write-behind",
936 "resync-failed-syncs-after-fsync", "on");
937 if (ret < 0) {
938 error_setg_errno(errp, errno, "Unable to set xlator key/value pair");
939 ret = -errno;
940 goto exit;
941 }
942 #endif
943
944 reop_s->fd = glfs_open(reop_s->glfs, gconf->path, open_flags);
945 if (reop_s->fd == NULL) {
946 /* reops->glfs will be cleaned up in _abort */
947 ret = -errno;
948 goto exit;
949 }
950
951 exit:
952 /* state->opaque will be freed in either the _abort or _commit */
953 qapi_free_BlockdevOptionsGluster(gconf);
954 return ret;
955 }
956
qemu_gluster_reopen_commit(BDRVReopenState * state)957 static void qemu_gluster_reopen_commit(BDRVReopenState *state)
958 {
959 BDRVGlusterReopenState *reop_s = state->opaque;
960 BDRVGlusterState *s = state->bs->opaque;
961
962
963 /* close the old */
964 if (s->fd) {
965 glfs_close(s->fd);
966 }
967
968 glfs_clear_preopened(s->glfs);
969
970 /* use the newly opened image / connection */
971 s->fd = reop_s->fd;
972 s->glfs = reop_s->glfs;
973
974 g_free(state->opaque);
975 state->opaque = NULL;
976
977 return;
978 }
979
980
qemu_gluster_reopen_abort(BDRVReopenState * state)981 static void qemu_gluster_reopen_abort(BDRVReopenState *state)
982 {
983 BDRVGlusterReopenState *reop_s = state->opaque;
984
985 if (reop_s == NULL) {
986 return;
987 }
988
989 if (reop_s->fd) {
990 glfs_close(reop_s->fd);
991 }
992
993 glfs_clear_preopened(reop_s->glfs);
994
995 g_free(state->opaque);
996 state->opaque = NULL;
997
998 return;
999 }
1000
1001 #ifdef CONFIG_GLUSTERFS_ZEROFILL
qemu_gluster_co_pwrite_zeroes(BlockDriverState * bs,int64_t offset,int64_t bytes,BdrvRequestFlags flags)1002 static coroutine_fn int qemu_gluster_co_pwrite_zeroes(BlockDriverState *bs,
1003 int64_t offset,
1004 int64_t bytes,
1005 BdrvRequestFlags flags)
1006 {
1007 int ret;
1008 GlusterAIOCB acb;
1009 BDRVGlusterState *s = bs->opaque;
1010
1011 acb.size = bytes;
1012 acb.ret = 0;
1013 acb.coroutine = qemu_coroutine_self();
1014 acb.aio_context = bdrv_get_aio_context(bs);
1015
1016 ret = glfs_zerofill_async(s->fd, offset, bytes, gluster_finish_aiocb, &acb);
1017 if (ret < 0) {
1018 return -errno;
1019 }
1020
1021 qemu_coroutine_yield();
1022 return acb.ret;
1023 }
1024 #endif
1025
qemu_gluster_do_truncate(struct glfs_fd * fd,int64_t offset,PreallocMode prealloc,Error ** errp)1026 static int qemu_gluster_do_truncate(struct glfs_fd *fd, int64_t offset,
1027 PreallocMode prealloc, Error **errp)
1028 {
1029 int64_t current_length;
1030
1031 current_length = glfs_lseek(fd, 0, SEEK_END);
1032 if (current_length < 0) {
1033 error_setg_errno(errp, errno, "Failed to determine current size");
1034 return -errno;
1035 }
1036
1037 if (current_length > offset && prealloc != PREALLOC_MODE_OFF) {
1038 error_setg(errp, "Cannot use preallocation for shrinking files");
1039 return -ENOTSUP;
1040 }
1041
1042 if (current_length == offset) {
1043 return 0;
1044 }
1045
1046 switch (prealloc) {
1047 #ifdef CONFIG_GLUSTERFS_FALLOCATE
1048 case PREALLOC_MODE_FALLOC:
1049 if (glfs_fallocate(fd, 0, current_length, offset - current_length)) {
1050 error_setg_errno(errp, errno, "Could not preallocate data");
1051 return -errno;
1052 }
1053 break;
1054 #endif /* CONFIG_GLUSTERFS_FALLOCATE */
1055 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1056 case PREALLOC_MODE_FULL:
1057 if (glfs_ftruncate(fd, offset)) {
1058 error_setg_errno(errp, errno, "Could not resize file");
1059 return -errno;
1060 }
1061 if (glfs_zerofill(fd, current_length, offset - current_length)) {
1062 error_setg_errno(errp, errno, "Could not zerofill the new area");
1063 return -errno;
1064 }
1065 break;
1066 #endif /* CONFIG_GLUSTERFS_ZEROFILL */
1067 case PREALLOC_MODE_OFF:
1068 if (glfs_ftruncate(fd, offset)) {
1069 error_setg_errno(errp, errno, "Could not resize file");
1070 return -errno;
1071 }
1072 break;
1073 default:
1074 error_setg(errp, "Unsupported preallocation mode: %s",
1075 PreallocMode_str(prealloc));
1076 return -EINVAL;
1077 }
1078
1079 return 0;
1080 }
1081
qemu_gluster_co_create(BlockdevCreateOptions * options,Error ** errp)1082 static int qemu_gluster_co_create(BlockdevCreateOptions *options,
1083 Error **errp)
1084 {
1085 BlockdevCreateOptionsGluster *opts = &options->u.gluster;
1086 struct glfs *glfs;
1087 struct glfs_fd *fd = NULL;
1088 int ret = 0;
1089
1090 assert(options->driver == BLOCKDEV_DRIVER_GLUSTER);
1091
1092 glfs = qemu_gluster_glfs_init(opts->location, errp);
1093 if (!glfs) {
1094 ret = -errno;
1095 goto out;
1096 }
1097
1098 fd = glfs_creat(glfs, opts->location->path,
1099 O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR | S_IWUSR);
1100 if (!fd) {
1101 ret = -errno;
1102 goto out;
1103 }
1104
1105 ret = qemu_gluster_do_truncate(fd, opts->size, opts->preallocation, errp);
1106
1107 out:
1108 if (fd) {
1109 if (glfs_close(fd) != 0 && ret == 0) {
1110 ret = -errno;
1111 }
1112 }
1113 glfs_clear_preopened(glfs);
1114 return ret;
1115 }
1116
qemu_gluster_co_create_opts(BlockDriver * drv,const char * filename,QemuOpts * opts,Error ** errp)1117 static int coroutine_fn qemu_gluster_co_create_opts(BlockDriver *drv,
1118 const char *filename,
1119 QemuOpts *opts,
1120 Error **errp)
1121 {
1122 BlockdevCreateOptions *options;
1123 BlockdevCreateOptionsGluster *gopts;
1124 BlockdevOptionsGluster *gconf;
1125 char *tmp = NULL;
1126 Error *local_err = NULL;
1127 int ret;
1128
1129 options = g_new0(BlockdevCreateOptions, 1);
1130 options->driver = BLOCKDEV_DRIVER_GLUSTER;
1131 gopts = &options->u.gluster;
1132
1133 gconf = g_new0(BlockdevOptionsGluster, 1);
1134 gopts->location = gconf;
1135
1136 gopts->size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
1137 BDRV_SECTOR_SIZE);
1138
1139 tmp = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
1140 gopts->preallocation = qapi_enum_parse(&PreallocMode_lookup, tmp,
1141 PREALLOC_MODE_OFF, &local_err);
1142 g_free(tmp);
1143 if (local_err) {
1144 error_propagate(errp, local_err);
1145 ret = -EINVAL;
1146 goto fail;
1147 }
1148
1149 gconf->debug = qemu_opt_get_number_del(opts, GLUSTER_OPT_DEBUG,
1150 GLUSTER_DEBUG_DEFAULT);
1151 if (gconf->debug < 0) {
1152 gconf->debug = 0;
1153 } else if (gconf->debug > GLUSTER_DEBUG_MAX) {
1154 gconf->debug = GLUSTER_DEBUG_MAX;
1155 }
1156 gconf->has_debug = true;
1157
1158 gconf->logfile = qemu_opt_get_del(opts, GLUSTER_OPT_LOGFILE);
1159 if (!gconf->logfile) {
1160 gconf->logfile = g_strdup(GLUSTER_LOGFILE_DEFAULT);
1161 }
1162
1163 ret = qemu_gluster_parse(gconf, filename, NULL, errp);
1164 if (ret < 0) {
1165 goto fail;
1166 }
1167
1168 ret = qemu_gluster_co_create(options, errp);
1169 if (ret < 0) {
1170 goto fail;
1171 }
1172
1173 ret = 0;
1174 fail:
1175 qapi_free_BlockdevCreateOptions(options);
1176 return ret;
1177 }
1178
qemu_gluster_co_rw(BlockDriverState * bs,int64_t sector_num,int nb_sectors,QEMUIOVector * qiov,int write)1179 static coroutine_fn int qemu_gluster_co_rw(BlockDriverState *bs,
1180 int64_t sector_num, int nb_sectors,
1181 QEMUIOVector *qiov, int write)
1182 {
1183 int ret;
1184 GlusterAIOCB acb;
1185 BDRVGlusterState *s = bs->opaque;
1186 size_t size = nb_sectors * BDRV_SECTOR_SIZE;
1187 off_t offset = sector_num * BDRV_SECTOR_SIZE;
1188
1189 acb.size = size;
1190 acb.ret = 0;
1191 acb.coroutine = qemu_coroutine_self();
1192 acb.aio_context = bdrv_get_aio_context(bs);
1193
1194 if (write) {
1195 ret = glfs_pwritev_async(s->fd, qiov->iov, qiov->niov, offset, 0,
1196 gluster_finish_aiocb, &acb);
1197 } else {
1198 ret = glfs_preadv_async(s->fd, qiov->iov, qiov->niov, offset, 0,
1199 gluster_finish_aiocb, &acb);
1200 }
1201
1202 if (ret < 0) {
1203 return -errno;
1204 }
1205
1206 qemu_coroutine_yield();
1207 return acb.ret;
1208 }
1209
qemu_gluster_co_truncate(BlockDriverState * bs,int64_t offset,bool exact,PreallocMode prealloc,BdrvRequestFlags flags,Error ** errp)1210 static coroutine_fn int qemu_gluster_co_truncate(BlockDriverState *bs,
1211 int64_t offset,
1212 bool exact,
1213 PreallocMode prealloc,
1214 BdrvRequestFlags flags,
1215 Error **errp)
1216 {
1217 BDRVGlusterState *s = bs->opaque;
1218 return qemu_gluster_do_truncate(s->fd, offset, prealloc, errp);
1219 }
1220
qemu_gluster_co_readv(BlockDriverState * bs,int64_t sector_num,int nb_sectors,QEMUIOVector * qiov)1221 static coroutine_fn int qemu_gluster_co_readv(BlockDriverState *bs,
1222 int64_t sector_num,
1223 int nb_sectors,
1224 QEMUIOVector *qiov)
1225 {
1226 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 0);
1227 }
1228
qemu_gluster_co_writev(BlockDriverState * bs,int64_t sector_num,int nb_sectors,QEMUIOVector * qiov,int flags)1229 static coroutine_fn int qemu_gluster_co_writev(BlockDriverState *bs,
1230 int64_t sector_num,
1231 int nb_sectors,
1232 QEMUIOVector *qiov,
1233 int flags)
1234 {
1235 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 1);
1236 }
1237
qemu_gluster_close(BlockDriverState * bs)1238 static void qemu_gluster_close(BlockDriverState *bs)
1239 {
1240 BDRVGlusterState *s = bs->opaque;
1241
1242 g_free(s->logfile);
1243 if (s->fd) {
1244 glfs_close(s->fd);
1245 s->fd = NULL;
1246 }
1247 glfs_clear_preopened(s->glfs);
1248 }
1249
qemu_gluster_co_flush_to_disk(BlockDriverState * bs)1250 static coroutine_fn int qemu_gluster_co_flush_to_disk(BlockDriverState *bs)
1251 {
1252 int ret;
1253 GlusterAIOCB acb;
1254 BDRVGlusterState *s = bs->opaque;
1255
1256 acb.size = 0;
1257 acb.ret = 0;
1258 acb.coroutine = qemu_coroutine_self();
1259 acb.aio_context = bdrv_get_aio_context(bs);
1260
1261 ret = glfs_fsync_async(s->fd, gluster_finish_aiocb, &acb);
1262 if (ret < 0) {
1263 ret = -errno;
1264 goto error;
1265 }
1266
1267 qemu_coroutine_yield();
1268 if (acb.ret < 0) {
1269 ret = acb.ret;
1270 goto error;
1271 }
1272
1273 return acb.ret;
1274
1275 error:
1276 /* Some versions of Gluster (3.5.6 -> 3.5.8?) will not retain its cache
1277 * after a fsync failure, so we have no way of allowing the guest to safely
1278 * continue. Gluster versions prior to 3.5.6 don't retain the cache
1279 * either, but will invalidate the fd on error, so this is again our only
1280 * option.
1281 *
1282 * The 'resync-failed-syncs-after-fsync' xlator option for the
1283 * write-behind cache will cause later gluster versions to retain its
1284 * cache after error, so long as the fd remains open. However, we
1285 * currently have no way of knowing if this option is supported.
1286 *
1287 * TODO: Once gluster provides a way for us to determine if the option
1288 * is supported, bypass the closure and setting drv to NULL. */
1289 qemu_gluster_close(bs);
1290 bs->drv = NULL;
1291 return ret;
1292 }
1293
1294 #ifdef CONFIG_GLUSTERFS_DISCARD
qemu_gluster_co_pdiscard(BlockDriverState * bs,int64_t offset,int64_t bytes)1295 static coroutine_fn int qemu_gluster_co_pdiscard(BlockDriverState *bs,
1296 int64_t offset, int64_t bytes)
1297 {
1298 int ret;
1299 GlusterAIOCB acb;
1300 BDRVGlusterState *s = bs->opaque;
1301
1302 assert(bytes <= SIZE_MAX); /* rely on max_pdiscard */
1303
1304 acb.size = 0;
1305 acb.ret = 0;
1306 acb.coroutine = qemu_coroutine_self();
1307 acb.aio_context = bdrv_get_aio_context(bs);
1308
1309 ret = glfs_discard_async(s->fd, offset, bytes, gluster_finish_aiocb, &acb);
1310 if (ret < 0) {
1311 return -errno;
1312 }
1313
1314 qemu_coroutine_yield();
1315 return acb.ret;
1316 }
1317 #endif
1318
qemu_gluster_co_getlength(BlockDriverState * bs)1319 static int64_t coroutine_fn qemu_gluster_co_getlength(BlockDriverState *bs)
1320 {
1321 BDRVGlusterState *s = bs->opaque;
1322 int64_t ret;
1323
1324 ret = glfs_lseek(s->fd, 0, SEEK_END);
1325 if (ret < 0) {
1326 return -errno;
1327 } else {
1328 return ret;
1329 }
1330 }
1331
1332 static int64_t coroutine_fn
qemu_gluster_co_get_allocated_file_size(BlockDriverState * bs)1333 qemu_gluster_co_get_allocated_file_size(BlockDriverState *bs)
1334 {
1335 BDRVGlusterState *s = bs->opaque;
1336 struct stat st;
1337 int ret;
1338
1339 ret = glfs_fstat(s->fd, &st);
1340 if (ret < 0) {
1341 return -errno;
1342 } else {
1343 return st.st_blocks * 512;
1344 }
1345 }
1346
1347 /*
1348 * Find allocation range in @bs around offset @start.
1349 * May change underlying file descriptor's file offset.
1350 * If @start is not in a hole, store @start in @data, and the
1351 * beginning of the next hole in @hole, and return 0.
1352 * If @start is in a non-trailing hole, store @start in @hole and the
1353 * beginning of the next non-hole in @data, and return 0.
1354 * If @start is in a trailing hole or beyond EOF, return -ENXIO.
1355 * If we can't find out, return a negative errno other than -ENXIO.
1356 *
1357 * (Shamefully copied from file-posix.c, only minuscule adaptions.)
1358 */
find_allocation(BlockDriverState * bs,off_t start,off_t * data,off_t * hole)1359 static int find_allocation(BlockDriverState *bs, off_t start,
1360 off_t *data, off_t *hole)
1361 {
1362 BDRVGlusterState *s = bs->opaque;
1363
1364 if (!s->supports_seek_data) {
1365 goto exit;
1366 }
1367
1368 #if defined SEEK_HOLE && defined SEEK_DATA
1369 off_t offs;
1370
1371 /*
1372 * SEEK_DATA cases:
1373 * D1. offs == start: start is in data
1374 * D2. offs > start: start is in a hole, next data at offs
1375 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole
1376 * or start is beyond EOF
1377 * If the latter happens, the file has been truncated behind
1378 * our back since we opened it. All bets are off then.
1379 * Treating like a trailing hole is simplest.
1380 * D4. offs < 0, errno != ENXIO: we learned nothing
1381 */
1382 offs = glfs_lseek(s->fd, start, SEEK_DATA);
1383 if (offs < 0) {
1384 return -errno; /* D3 or D4 */
1385 }
1386
1387 if (offs < start) {
1388 /* This is not a valid return by lseek(). We are safe to just return
1389 * -EIO in this case, and we'll treat it like D4. Unfortunately some
1390 * versions of gluster server will return offs < start, so an assert
1391 * here will unnecessarily abort QEMU. */
1392 return -EIO;
1393 }
1394
1395 if (offs > start) {
1396 /* D2: in hole, next data at offs */
1397 *hole = start;
1398 *data = offs;
1399 return 0;
1400 }
1401
1402 /* D1: in data, end not yet known */
1403
1404 /*
1405 * SEEK_HOLE cases:
1406 * H1. offs == start: start is in a hole
1407 * If this happens here, a hole has been dug behind our back
1408 * since the previous lseek().
1409 * H2. offs > start: either start is in data, next hole at offs,
1410 * or start is in trailing hole, EOF at offs
1411 * Linux treats trailing holes like any other hole: offs ==
1412 * start. Solaris seeks to EOF instead: offs > start (blech).
1413 * If that happens here, a hole has been dug behind our back
1414 * since the previous lseek().
1415 * H3. offs < 0, errno = ENXIO: start is beyond EOF
1416 * If this happens, the file has been truncated behind our
1417 * back since we opened it. Treat it like a trailing hole.
1418 * H4. offs < 0, errno != ENXIO: we learned nothing
1419 * Pretend we know nothing at all, i.e. "forget" about D1.
1420 */
1421 offs = glfs_lseek(s->fd, start, SEEK_HOLE);
1422 if (offs < 0) {
1423 return -errno; /* D1 and (H3 or H4) */
1424 }
1425
1426 if (offs < start) {
1427 /* This is not a valid return by lseek(). We are safe to just return
1428 * -EIO in this case, and we'll treat it like H4. Unfortunately some
1429 * versions of gluster server will return offs < start, so an assert
1430 * here will unnecessarily abort QEMU. */
1431 return -EIO;
1432 }
1433
1434 if (offs > start) {
1435 /*
1436 * D1 and H2: either in data, next hole at offs, or it was in
1437 * data but is now in a trailing hole. In the latter case,
1438 * all bets are off. Treating it as if it there was data all
1439 * the way to EOF is safe, so simply do that.
1440 */
1441 *data = start;
1442 *hole = offs;
1443 return 0;
1444 }
1445
1446 /* D1 and H1 */
1447 return -EBUSY;
1448 #endif
1449
1450 exit:
1451 return -ENOTSUP;
1452 }
1453
1454 /*
1455 * Returns the allocation status of the specified offset.
1456 *
1457 * The block layer guarantees 'offset' and 'bytes' are within bounds.
1458 *
1459 * 'pnum' is set to the number of bytes (including and immediately following
1460 * the specified offset) that are known to be in the same
1461 * allocated/unallocated state.
1462 *
1463 * 'bytes' is a soft cap for 'pnum'. If the information is free, 'pnum' may
1464 * well exceed it.
1465 *
1466 * (Based on raw_co_block_status() from file-posix.c.)
1467 */
qemu_gluster_co_block_status(BlockDriverState * bs,bool want_zero,int64_t offset,int64_t bytes,int64_t * pnum,int64_t * map,BlockDriverState ** file)1468 static int coroutine_fn qemu_gluster_co_block_status(BlockDriverState *bs,
1469 bool want_zero,
1470 int64_t offset,
1471 int64_t bytes,
1472 int64_t *pnum,
1473 int64_t *map,
1474 BlockDriverState **file)
1475 {
1476 BDRVGlusterState *s = bs->opaque;
1477 off_t data = 0, hole = 0;
1478 int ret = -EINVAL;
1479
1480 assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment));
1481
1482 if (!s->fd) {
1483 return ret;
1484 }
1485
1486 if (!want_zero) {
1487 *pnum = bytes;
1488 *map = offset;
1489 *file = bs;
1490 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
1491 }
1492
1493 ret = find_allocation(bs, offset, &data, &hole);
1494 if (ret == -ENXIO) {
1495 /* Trailing hole */
1496 *pnum = bytes;
1497 ret = BDRV_BLOCK_ZERO;
1498 } else if (ret < 0) {
1499 /* No info available, so pretend there are no holes */
1500 *pnum = bytes;
1501 ret = BDRV_BLOCK_DATA;
1502 } else if (data == offset) {
1503 /* On a data extent, compute bytes to the end of the extent,
1504 * possibly including a partial sector at EOF. */
1505 *pnum = hole - offset;
1506
1507 /*
1508 * We are not allowed to return partial sectors, though, so
1509 * round up if necessary.
1510 */
1511 if (!QEMU_IS_ALIGNED(*pnum, bs->bl.request_alignment)) {
1512 int64_t file_length = qemu_gluster_co_getlength(bs);
1513 if (file_length > 0) {
1514 /* Ignore errors, this is just a safeguard */
1515 assert(hole == file_length);
1516 }
1517 *pnum = ROUND_UP(*pnum, bs->bl.request_alignment);
1518 }
1519
1520 ret = BDRV_BLOCK_DATA;
1521 } else {
1522 /* On a hole, compute bytes to the beginning of the next extent. */
1523 assert(hole == offset);
1524 *pnum = data - offset;
1525 ret = BDRV_BLOCK_ZERO;
1526 }
1527
1528 *map = offset;
1529 *file = bs;
1530
1531 return ret | BDRV_BLOCK_OFFSET_VALID;
1532 }
1533
1534
1535 static const char *const gluster_strong_open_opts[] = {
1536 GLUSTER_OPT_VOLUME,
1537 GLUSTER_OPT_PATH,
1538 GLUSTER_OPT_TYPE,
1539 GLUSTER_OPT_SERVER_PATTERN,
1540 GLUSTER_OPT_HOST,
1541 GLUSTER_OPT_PORT,
1542 GLUSTER_OPT_TO,
1543 GLUSTER_OPT_IPV4,
1544 GLUSTER_OPT_IPV6,
1545 GLUSTER_OPT_SOCKET,
1546
1547 NULL
1548 };
1549
1550 static BlockDriver bdrv_gluster = {
1551 .format_name = "gluster",
1552 .protocol_name = "gluster",
1553 .instance_size = sizeof(BDRVGlusterState),
1554 .bdrv_file_open = qemu_gluster_open,
1555 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1556 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1557 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1558 .bdrv_close = qemu_gluster_close,
1559 .bdrv_co_create = qemu_gluster_co_create,
1560 .bdrv_co_create_opts = qemu_gluster_co_create_opts,
1561 .bdrv_co_getlength = qemu_gluster_co_getlength,
1562 .bdrv_co_get_allocated_file_size = qemu_gluster_co_get_allocated_file_size,
1563 .bdrv_co_truncate = qemu_gluster_co_truncate,
1564 .bdrv_co_readv = qemu_gluster_co_readv,
1565 .bdrv_co_writev = qemu_gluster_co_writev,
1566 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1567 #ifdef CONFIG_GLUSTERFS_DISCARD
1568 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1569 #endif
1570 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1571 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1572 #endif
1573 .bdrv_co_block_status = qemu_gluster_co_block_status,
1574 .bdrv_refresh_limits = qemu_gluster_refresh_limits,
1575 .create_opts = &qemu_gluster_create_opts,
1576 .strong_runtime_opts = gluster_strong_open_opts,
1577 };
1578
1579 static BlockDriver bdrv_gluster_tcp = {
1580 .format_name = "gluster",
1581 .protocol_name = "gluster+tcp",
1582 .instance_size = sizeof(BDRVGlusterState),
1583 .bdrv_file_open = qemu_gluster_open,
1584 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1585 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1586 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1587 .bdrv_close = qemu_gluster_close,
1588 .bdrv_co_create = qemu_gluster_co_create,
1589 .bdrv_co_create_opts = qemu_gluster_co_create_opts,
1590 .bdrv_co_getlength = qemu_gluster_co_getlength,
1591 .bdrv_co_get_allocated_file_size = qemu_gluster_co_get_allocated_file_size,
1592 .bdrv_co_truncate = qemu_gluster_co_truncate,
1593 .bdrv_co_readv = qemu_gluster_co_readv,
1594 .bdrv_co_writev = qemu_gluster_co_writev,
1595 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1596 #ifdef CONFIG_GLUSTERFS_DISCARD
1597 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1598 #endif
1599 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1600 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1601 #endif
1602 .bdrv_co_block_status = qemu_gluster_co_block_status,
1603 .bdrv_refresh_limits = qemu_gluster_refresh_limits,
1604 .create_opts = &qemu_gluster_create_opts,
1605 .strong_runtime_opts = gluster_strong_open_opts,
1606 };
1607
1608 static BlockDriver bdrv_gluster_unix = {
1609 .format_name = "gluster",
1610 .protocol_name = "gluster+unix",
1611 .instance_size = sizeof(BDRVGlusterState),
1612 .bdrv_file_open = qemu_gluster_open,
1613 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1614 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1615 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1616 .bdrv_close = qemu_gluster_close,
1617 .bdrv_co_create = qemu_gluster_co_create,
1618 .bdrv_co_create_opts = qemu_gluster_co_create_opts,
1619 .bdrv_co_getlength = qemu_gluster_co_getlength,
1620 .bdrv_co_get_allocated_file_size = qemu_gluster_co_get_allocated_file_size,
1621 .bdrv_co_truncate = qemu_gluster_co_truncate,
1622 .bdrv_co_readv = qemu_gluster_co_readv,
1623 .bdrv_co_writev = qemu_gluster_co_writev,
1624 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1625 #ifdef CONFIG_GLUSTERFS_DISCARD
1626 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1627 #endif
1628 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1629 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1630 #endif
1631 .bdrv_co_block_status = qemu_gluster_co_block_status,
1632 .bdrv_refresh_limits = qemu_gluster_refresh_limits,
1633 .create_opts = &qemu_gluster_create_opts,
1634 .strong_runtime_opts = gluster_strong_open_opts,
1635 };
1636
bdrv_gluster_init(void)1637 static void bdrv_gluster_init(void)
1638 {
1639 bdrv_register(&bdrv_gluster_unix);
1640 bdrv_register(&bdrv_gluster_tcp);
1641 bdrv_register(&bdrv_gluster);
1642 }
1643
1644 block_init(bdrv_gluster_init);
1645