sockets: check that the named file descriptor is a socket
[qemu/ar7.git] / block / gluster.c
blob63d3c37d4c7f8e3bcbf28712efa94eba78b9109b
1 /*
2 * GlusterFS backend for QEMU
4 * Copyright (C) 2012 Bharata B Rao <bharata@linux.vnet.ibm.com>
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.
9 */
11 #include "qemu/osdep.h"
12 #include <glusterfs/api/glfs.h>
13 #include "block/block_int.h"
14 #include "qapi/error.h"
15 #include "qapi/qmp/qdict.h"
16 #include "qapi/qmp/qerror.h"
17 #include "qemu/uri.h"
18 #include "qemu/error-report.h"
19 #include "qemu/option.h"
20 #include "qemu/cutils.h"
22 #define GLUSTER_OPT_FILENAME "filename"
23 #define GLUSTER_OPT_VOLUME "volume"
24 #define GLUSTER_OPT_PATH "path"
25 #define GLUSTER_OPT_TYPE "type"
26 #define GLUSTER_OPT_SERVER_PATTERN "server."
27 #define GLUSTER_OPT_HOST "host"
28 #define GLUSTER_OPT_PORT "port"
29 #define GLUSTER_OPT_TO "to"
30 #define GLUSTER_OPT_IPV4 "ipv4"
31 #define GLUSTER_OPT_IPV6 "ipv6"
32 #define GLUSTER_OPT_SOCKET "socket"
33 #define GLUSTER_OPT_DEBUG "debug"
34 #define GLUSTER_DEFAULT_PORT 24007
35 #define GLUSTER_DEBUG_DEFAULT 4
36 #define GLUSTER_DEBUG_MAX 9
37 #define GLUSTER_OPT_LOGFILE "logfile"
38 #define GLUSTER_LOGFILE_DEFAULT "-" /* handled in libgfapi as /dev/stderr */
40 #define GERR_INDEX_HINT "hint: check in 'server' array index '%d'\n"
42 typedef struct GlusterAIOCB {
43 int64_t size;
44 int ret;
45 Coroutine *coroutine;
46 AioContext *aio_context;
47 } GlusterAIOCB;
49 typedef struct BDRVGlusterState {
50 struct glfs *glfs;
51 struct glfs_fd *fd;
52 char *logfile;
53 bool supports_seek_data;
54 int debug;
55 } BDRVGlusterState;
57 typedef struct BDRVGlusterReopenState {
58 struct glfs *glfs;
59 struct glfs_fd *fd;
60 } BDRVGlusterReopenState;
63 typedef struct GlfsPreopened {
64 char *volume;
65 glfs_t *fs;
66 int ref;
67 } GlfsPreopened;
69 typedef struct ListElement {
70 QLIST_ENTRY(ListElement) list;
71 GlfsPreopened saved;
72 } ListElement;
74 static QLIST_HEAD(glfs_list, ListElement) glfs_list;
76 static QemuOptsList qemu_gluster_create_opts = {
77 .name = "qemu-gluster-create-opts",
78 .head = QTAILQ_HEAD_INITIALIZER(qemu_gluster_create_opts.head),
79 .desc = {
81 .name = BLOCK_OPT_SIZE,
82 .type = QEMU_OPT_SIZE,
83 .help = "Virtual disk size"
86 .name = BLOCK_OPT_PREALLOC,
87 .type = QEMU_OPT_STRING,
88 .help = "Preallocation mode (allowed values: off, full)"
91 .name = GLUSTER_OPT_DEBUG,
92 .type = QEMU_OPT_NUMBER,
93 .help = "Gluster log level, valid range is 0-9",
96 .name = GLUSTER_OPT_LOGFILE,
97 .type = QEMU_OPT_STRING,
98 .help = "Logfile path of libgfapi",
100 { /* end of list */ }
104 static QemuOptsList runtime_opts = {
105 .name = "gluster",
106 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
107 .desc = {
109 .name = GLUSTER_OPT_FILENAME,
110 .type = QEMU_OPT_STRING,
111 .help = "URL to the gluster image",
114 .name = GLUSTER_OPT_DEBUG,
115 .type = QEMU_OPT_NUMBER,
116 .help = "Gluster log level, valid range is 0-9",
119 .name = GLUSTER_OPT_LOGFILE,
120 .type = QEMU_OPT_STRING,
121 .help = "Logfile path of libgfapi",
123 { /* end of list */ }
127 static QemuOptsList runtime_json_opts = {
128 .name = "gluster_json",
129 .head = QTAILQ_HEAD_INITIALIZER(runtime_json_opts.head),
130 .desc = {
132 .name = GLUSTER_OPT_VOLUME,
133 .type = QEMU_OPT_STRING,
134 .help = "name of gluster volume where VM image resides",
137 .name = GLUSTER_OPT_PATH,
138 .type = QEMU_OPT_STRING,
139 .help = "absolute path to image file in gluster volume",
142 .name = GLUSTER_OPT_DEBUG,
143 .type = QEMU_OPT_NUMBER,
144 .help = "Gluster log level, valid range is 0-9",
146 { /* end of list */ }
150 static QemuOptsList runtime_type_opts = {
151 .name = "gluster_type",
152 .head = QTAILQ_HEAD_INITIALIZER(runtime_type_opts.head),
153 .desc = {
155 .name = GLUSTER_OPT_TYPE,
156 .type = QEMU_OPT_STRING,
157 .help = "inet|unix",
159 { /* end of list */ }
163 static QemuOptsList runtime_unix_opts = {
164 .name = "gluster_unix",
165 .head = QTAILQ_HEAD_INITIALIZER(runtime_unix_opts.head),
166 .desc = {
168 .name = GLUSTER_OPT_SOCKET,
169 .type = QEMU_OPT_STRING,
170 .help = "socket file path)",
172 { /* end of list */ }
176 static QemuOptsList runtime_inet_opts = {
177 .name = "gluster_inet",
178 .head = QTAILQ_HEAD_INITIALIZER(runtime_inet_opts.head),
179 .desc = {
181 .name = GLUSTER_OPT_TYPE,
182 .type = QEMU_OPT_STRING,
183 .help = "inet|unix",
186 .name = GLUSTER_OPT_HOST,
187 .type = QEMU_OPT_STRING,
188 .help = "host address (hostname/ipv4/ipv6 addresses)",
191 .name = GLUSTER_OPT_PORT,
192 .type = QEMU_OPT_STRING,
193 .help = "port number on which glusterd is listening (default 24007)",
196 .name = "to",
197 .type = QEMU_OPT_NUMBER,
198 .help = "max port number, not supported by gluster",
201 .name = "ipv4",
202 .type = QEMU_OPT_BOOL,
203 .help = "ipv4 bool value, not supported by gluster",
206 .name = "ipv6",
207 .type = QEMU_OPT_BOOL,
208 .help = "ipv6 bool value, not supported by gluster",
210 { /* end of list */ }
214 static void glfs_set_preopened(const char *volume, glfs_t *fs)
216 ListElement *entry = NULL;
218 entry = g_new(ListElement, 1);
220 entry->saved.volume = g_strdup(volume);
222 entry->saved.fs = fs;
223 entry->saved.ref = 1;
225 QLIST_INSERT_HEAD(&glfs_list, entry, list);
228 static glfs_t *glfs_find_preopened(const char *volume)
230 ListElement *entry = NULL;
232 QLIST_FOREACH(entry, &glfs_list, list) {
233 if (strcmp(entry->saved.volume, volume) == 0) {
234 entry->saved.ref++;
235 return entry->saved.fs;
239 return NULL;
242 static void glfs_clear_preopened(glfs_t *fs)
244 ListElement *entry = NULL;
245 ListElement *next;
247 if (fs == NULL) {
248 return;
251 QLIST_FOREACH_SAFE(entry, &glfs_list, list, next) {
252 if (entry->saved.fs == fs) {
253 if (--entry->saved.ref) {
254 return;
257 QLIST_REMOVE(entry, list);
259 glfs_fini(entry->saved.fs);
260 g_free(entry->saved.volume);
261 g_free(entry);
266 static int parse_volume_options(BlockdevOptionsGluster *gconf, char *path)
268 char *p, *q;
270 if (!path) {
271 return -EINVAL;
274 /* volume */
275 p = q = path + strspn(path, "/");
276 p += strcspn(p, "/");
277 if (*p == '\0') {
278 return -EINVAL;
280 gconf->volume = g_strndup(q, p - q);
282 /* path */
283 p += strspn(p, "/");
284 if (*p == '\0') {
285 return -EINVAL;
287 gconf->path = g_strdup(p);
288 return 0;
292 * file=gluster[+transport]://[host[:port]]/volume/path[?socket=...]
294 * 'gluster' is the protocol.
296 * 'transport' specifies the transport type used to connect to gluster
297 * management daemon (glusterd). Valid transport types are
298 * tcp or unix. If a transport type isn't specified, then tcp type is assumed.
300 * 'host' specifies the host where the volume file specification for
301 * the given volume resides. This can be either hostname or ipv4 address.
302 * If transport type is 'unix', then 'host' field should not be specified.
303 * The 'socket' field needs to be populated with the path to unix domain
304 * socket.
306 * 'port' is the port number on which glusterd is listening. This is optional
307 * and if not specified, QEMU will send 0 which will make gluster to use the
308 * default port. If the transport type is unix, then 'port' should not be
309 * specified.
311 * 'volume' is the name of the gluster volume which contains the VM image.
313 * 'path' is the path to the actual VM image that resides on gluster volume.
315 * Examples:
317 * file=gluster://1.2.3.4/testvol/a.img
318 * file=gluster+tcp://1.2.3.4/testvol/a.img
319 * file=gluster+tcp://1.2.3.4:24007/testvol/dir/a.img
320 * file=gluster+tcp://host.domain.com:24007/testvol/dir/a.img
321 * file=gluster+unix:///testvol/dir/a.img?socket=/tmp/glusterd.socket
323 static int qemu_gluster_parse_uri(BlockdevOptionsGluster *gconf,
324 const char *filename)
326 SocketAddress *gsconf;
327 URI *uri;
328 QueryParams *qp = NULL;
329 bool is_unix = false;
330 int ret = 0;
332 uri = uri_parse(filename);
333 if (!uri) {
334 return -EINVAL;
337 gconf->server = g_new0(SocketAddressList, 1);
338 gconf->server->value = gsconf = g_new0(SocketAddress, 1);
340 /* transport */
341 if (!uri->scheme || !strcmp(uri->scheme, "gluster")) {
342 gsconf->type = SOCKET_ADDRESS_TYPE_INET;
343 } else if (!strcmp(uri->scheme, "gluster+tcp")) {
344 gsconf->type = SOCKET_ADDRESS_TYPE_INET;
345 } else if (!strcmp(uri->scheme, "gluster+unix")) {
346 gsconf->type = SOCKET_ADDRESS_TYPE_UNIX;
347 is_unix = true;
348 } else if (!strcmp(uri->scheme, "gluster+rdma")) {
349 gsconf->type = SOCKET_ADDRESS_TYPE_INET;
350 warn_report("rdma feature is not supported, falling back to tcp");
351 } else {
352 ret = -EINVAL;
353 goto out;
356 ret = parse_volume_options(gconf, uri->path);
357 if (ret < 0) {
358 goto out;
361 qp = query_params_parse(uri->query);
362 if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) {
363 ret = -EINVAL;
364 goto out;
367 if (is_unix) {
368 if (uri->server || uri->port) {
369 ret = -EINVAL;
370 goto out;
372 if (strcmp(qp->p[0].name, "socket")) {
373 ret = -EINVAL;
374 goto out;
376 gsconf->u.q_unix.path = g_strdup(qp->p[0].value);
377 } else {
378 gsconf->u.inet.host = g_strdup(uri->server ? uri->server : "localhost");
379 if (uri->port) {
380 gsconf->u.inet.port = g_strdup_printf("%d", uri->port);
381 } else {
382 gsconf->u.inet.port = g_strdup_printf("%d", GLUSTER_DEFAULT_PORT);
386 out:
387 if (qp) {
388 query_params_free(qp);
390 uri_free(uri);
391 return ret;
394 static struct glfs *qemu_gluster_glfs_init(BlockdevOptionsGluster *gconf,
395 Error **errp)
397 struct glfs *glfs;
398 int ret;
399 int old_errno;
400 SocketAddressList *server;
401 unsigned long long port;
403 glfs = glfs_find_preopened(gconf->volume);
404 if (glfs) {
405 return glfs;
408 glfs = glfs_new(gconf->volume);
409 if (!glfs) {
410 goto out;
413 glfs_set_preopened(gconf->volume, glfs);
415 for (server = gconf->server; server; server = server->next) {
416 switch (server->value->type) {
417 case SOCKET_ADDRESS_TYPE_UNIX:
418 ret = glfs_set_volfile_server(glfs, "unix",
419 server->value->u.q_unix.path, 0);
420 break;
421 case SOCKET_ADDRESS_TYPE_INET:
422 if (parse_uint_full(server->value->u.inet.port, &port, 10) < 0 ||
423 port > 65535) {
424 error_setg(errp, "'%s' is not a valid port number",
425 server->value->u.inet.port);
426 errno = EINVAL;
427 goto out;
429 ret = glfs_set_volfile_server(glfs, "tcp",
430 server->value->u.inet.host,
431 (int)port);
432 break;
433 case SOCKET_ADDRESS_TYPE_VSOCK:
434 case SOCKET_ADDRESS_TYPE_FD:
435 default:
436 abort();
439 if (ret < 0) {
440 goto out;
444 ret = glfs_set_logging(glfs, gconf->logfile, gconf->debug);
445 if (ret < 0) {
446 goto out;
449 ret = glfs_init(glfs);
450 if (ret) {
451 error_setg(errp, "Gluster connection for volume %s, path %s failed"
452 " to connect", gconf->volume, gconf->path);
453 for (server = gconf->server; server; server = server->next) {
454 if (server->value->type == SOCKET_ADDRESS_TYPE_UNIX) {
455 error_append_hint(errp, "hint: failed on socket %s ",
456 server->value->u.q_unix.path);
457 } else {
458 error_append_hint(errp, "hint: failed on host %s and port %s ",
459 server->value->u.inet.host,
460 server->value->u.inet.port);
464 error_append_hint(errp, "Please refer to gluster logs for more info\n");
466 /* glfs_init sometimes doesn't set errno although docs suggest that */
467 if (errno == 0) {
468 errno = EINVAL;
471 goto out;
473 return glfs;
475 out:
476 if (glfs) {
477 old_errno = errno;
478 glfs_clear_preopened(glfs);
479 errno = old_errno;
481 return NULL;
485 * Convert the json formatted command line into qapi.
487 static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf,
488 QDict *options, Error **errp)
490 QemuOpts *opts;
491 SocketAddress *gsconf = NULL;
492 SocketAddressList *curr = NULL;
493 QDict *backing_options = NULL;
494 Error *local_err = NULL;
495 char *str = NULL;
496 const char *ptr;
497 int i, type, num_servers;
499 /* create opts info from runtime_json_opts list */
500 opts = qemu_opts_create(&runtime_json_opts, NULL, 0, &error_abort);
501 qemu_opts_absorb_qdict(opts, options, &local_err);
502 if (local_err) {
503 goto out;
506 num_servers = qdict_array_entries(options, GLUSTER_OPT_SERVER_PATTERN);
507 if (num_servers < 1) {
508 error_setg(&local_err, QERR_MISSING_PARAMETER, "server");
509 goto out;
512 ptr = qemu_opt_get(opts, GLUSTER_OPT_VOLUME);
513 if (!ptr) {
514 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_VOLUME);
515 goto out;
517 gconf->volume = g_strdup(ptr);
519 ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH);
520 if (!ptr) {
521 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_PATH);
522 goto out;
524 gconf->path = g_strdup(ptr);
525 qemu_opts_del(opts);
527 for (i = 0; i < num_servers; i++) {
528 str = g_strdup_printf(GLUSTER_OPT_SERVER_PATTERN"%d.", i);
529 qdict_extract_subqdict(options, &backing_options, str);
531 /* create opts info from runtime_type_opts list */
532 opts = qemu_opts_create(&runtime_type_opts, NULL, 0, &error_abort);
533 qemu_opts_absorb_qdict(opts, backing_options, &local_err);
534 if (local_err) {
535 goto out;
538 ptr = qemu_opt_get(opts, GLUSTER_OPT_TYPE);
539 if (!ptr) {
540 error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_TYPE);
541 error_append_hint(&local_err, GERR_INDEX_HINT, i);
542 goto out;
545 gsconf = g_new0(SocketAddress, 1);
546 if (!strcmp(ptr, "tcp")) {
547 ptr = "inet"; /* accept legacy "tcp" */
549 type = qapi_enum_parse(&SocketAddressType_lookup, ptr, -1, NULL);
550 if (type != SOCKET_ADDRESS_TYPE_INET
551 && type != SOCKET_ADDRESS_TYPE_UNIX) {
552 error_setg(&local_err,
553 "Parameter '%s' may be 'inet' or 'unix'",
554 GLUSTER_OPT_TYPE);
555 error_append_hint(&local_err, GERR_INDEX_HINT, i);
556 goto out;
558 gsconf->type = type;
559 qemu_opts_del(opts);
561 if (gsconf->type == SOCKET_ADDRESS_TYPE_INET) {
562 /* create opts info from runtime_inet_opts list */
563 opts = qemu_opts_create(&runtime_inet_opts, NULL, 0, &error_abort);
564 qemu_opts_absorb_qdict(opts, backing_options, &local_err);
565 if (local_err) {
566 goto out;
569 ptr = qemu_opt_get(opts, GLUSTER_OPT_HOST);
570 if (!ptr) {
571 error_setg(&local_err, QERR_MISSING_PARAMETER,
572 GLUSTER_OPT_HOST);
573 error_append_hint(&local_err, GERR_INDEX_HINT, i);
574 goto out;
576 gsconf->u.inet.host = g_strdup(ptr);
577 ptr = qemu_opt_get(opts, GLUSTER_OPT_PORT);
578 if (!ptr) {
579 error_setg(&local_err, QERR_MISSING_PARAMETER,
580 GLUSTER_OPT_PORT);
581 error_append_hint(&local_err, GERR_INDEX_HINT, i);
582 goto out;
584 gsconf->u.inet.port = g_strdup(ptr);
586 /* defend for unsupported fields in InetSocketAddress,
587 * i.e. @ipv4, @ipv6 and @to
589 ptr = qemu_opt_get(opts, GLUSTER_OPT_TO);
590 if (ptr) {
591 gsconf->u.inet.has_to = true;
593 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV4);
594 if (ptr) {
595 gsconf->u.inet.has_ipv4 = true;
597 ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV6);
598 if (ptr) {
599 gsconf->u.inet.has_ipv6 = true;
601 if (gsconf->u.inet.has_to) {
602 error_setg(&local_err, "Parameter 'to' not supported");
603 goto out;
605 if (gsconf->u.inet.has_ipv4 || gsconf->u.inet.has_ipv6) {
606 error_setg(&local_err, "Parameters 'ipv4/ipv6' not supported");
607 goto out;
609 qemu_opts_del(opts);
610 } else {
611 /* create opts info from runtime_unix_opts list */
612 opts = qemu_opts_create(&runtime_unix_opts, NULL, 0, &error_abort);
613 qemu_opts_absorb_qdict(opts, backing_options, &local_err);
614 if (local_err) {
615 goto out;
618 ptr = qemu_opt_get(opts, GLUSTER_OPT_SOCKET);
619 if (!ptr) {
620 error_setg(&local_err, QERR_MISSING_PARAMETER,
621 GLUSTER_OPT_SOCKET);
622 error_append_hint(&local_err, GERR_INDEX_HINT, i);
623 goto out;
625 gsconf->u.q_unix.path = g_strdup(ptr);
626 qemu_opts_del(opts);
629 if (gconf->server == NULL) {
630 gconf->server = g_new0(SocketAddressList, 1);
631 gconf->server->value = gsconf;
632 curr = gconf->server;
633 } else {
634 curr->next = g_new0(SocketAddressList, 1);
635 curr->next->value = gsconf;
636 curr = curr->next;
638 gsconf = NULL;
640 QDECREF(backing_options);
641 backing_options = NULL;
642 g_free(str);
643 str = NULL;
646 return 0;
648 out:
649 error_propagate(errp, local_err);
650 qapi_free_SocketAddress(gsconf);
651 qemu_opts_del(opts);
652 g_free(str);
653 QDECREF(backing_options);
654 errno = EINVAL;
655 return -errno;
658 /* Converts options given in @filename and the @options QDict into the QAPI
659 * object @gconf. */
660 static int qemu_gluster_parse(BlockdevOptionsGluster *gconf,
661 const char *filename,
662 QDict *options, Error **errp)
664 int ret;
665 if (filename) {
666 ret = qemu_gluster_parse_uri(gconf, filename);
667 if (ret < 0) {
668 error_setg(errp, "invalid URI");
669 error_append_hint(errp, "Usage: file=gluster[+transport]://"
670 "[host[:port]]volume/path[?socket=...]"
671 "[,file.debug=N]"
672 "[,file.logfile=/path/filename.log]\n");
673 return ret;
675 } else {
676 ret = qemu_gluster_parse_json(gconf, options, errp);
677 if (ret < 0) {
678 error_append_hint(errp, "Usage: "
679 "-drive driver=qcow2,file.driver=gluster,"
680 "file.volume=testvol,file.path=/path/a.qcow2"
681 "[,file.debug=9]"
682 "[,file.logfile=/path/filename.log],"
683 "file.server.0.type=inet,"
684 "file.server.0.host=1.2.3.4,"
685 "file.server.0.port=24007,"
686 "file.server.1.transport=unix,"
687 "file.server.1.socket=/var/run/glusterd.socket ..."
688 "\n");
689 return ret;
693 return 0;
696 static struct glfs *qemu_gluster_init(BlockdevOptionsGluster *gconf,
697 const char *filename,
698 QDict *options, Error **errp)
700 int ret;
702 ret = qemu_gluster_parse(gconf, filename, options, errp);
703 if (ret < 0) {
704 errno = -ret;
705 return NULL;
708 return qemu_gluster_glfs_init(gconf, errp);
712 * AIO callback routine called from GlusterFS thread.
714 static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret, void *arg)
716 GlusterAIOCB *acb = (GlusterAIOCB *)arg;
718 if (!ret || ret == acb->size) {
719 acb->ret = 0; /* Success */
720 } else if (ret < 0) {
721 acb->ret = -errno; /* Read/Write failed */
722 } else {
723 acb->ret = -EIO; /* Partial read/write - fail it */
726 aio_co_schedule(acb->aio_context, acb->coroutine);
729 static void qemu_gluster_parse_flags(int bdrv_flags, int *open_flags)
731 assert(open_flags != NULL);
733 *open_flags |= O_BINARY;
735 if (bdrv_flags & BDRV_O_RDWR) {
736 *open_flags |= O_RDWR;
737 } else {
738 *open_flags |= O_RDONLY;
741 if ((bdrv_flags & BDRV_O_NOCACHE)) {
742 *open_flags |= O_DIRECT;
747 * Do SEEK_DATA/HOLE to detect if it is functional. Older broken versions of
748 * gfapi incorrectly return the current offset when SEEK_DATA/HOLE is used.
749 * - Corrected versions return -1 and set errno to EINVAL.
750 * - Versions that support SEEK_DATA/HOLE correctly, will return -1 and set
751 * errno to ENXIO when SEEK_DATA is called with a position of EOF.
753 static bool qemu_gluster_test_seek(struct glfs_fd *fd)
755 off_t ret = 0;
757 #if defined SEEK_HOLE && defined SEEK_DATA
758 off_t eof;
760 eof = glfs_lseek(fd, 0, SEEK_END);
761 if (eof < 0) {
762 /* this should never occur */
763 return false;
766 /* this should always fail with ENXIO if SEEK_DATA is supported */
767 ret = glfs_lseek(fd, eof, SEEK_DATA);
768 #endif
770 return (ret < 0) && (errno == ENXIO);
773 static int qemu_gluster_open(BlockDriverState *bs, QDict *options,
774 int bdrv_flags, Error **errp)
776 BDRVGlusterState *s = bs->opaque;
777 int open_flags = 0;
778 int ret = 0;
779 BlockdevOptionsGluster *gconf = NULL;
780 QemuOpts *opts;
781 Error *local_err = NULL;
782 const char *filename, *logfile;
784 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
785 qemu_opts_absorb_qdict(opts, options, &local_err);
786 if (local_err) {
787 error_propagate(errp, local_err);
788 ret = -EINVAL;
789 goto out;
792 filename = qemu_opt_get(opts, GLUSTER_OPT_FILENAME);
794 s->debug = qemu_opt_get_number(opts, GLUSTER_OPT_DEBUG,
795 GLUSTER_DEBUG_DEFAULT);
796 if (s->debug < 0) {
797 s->debug = 0;
798 } else if (s->debug > GLUSTER_DEBUG_MAX) {
799 s->debug = GLUSTER_DEBUG_MAX;
802 gconf = g_new0(BlockdevOptionsGluster, 1);
803 gconf->debug = s->debug;
804 gconf->has_debug = true;
806 logfile = qemu_opt_get(opts, GLUSTER_OPT_LOGFILE);
807 s->logfile = g_strdup(logfile ? logfile : GLUSTER_LOGFILE_DEFAULT);
809 gconf->logfile = g_strdup(s->logfile);
810 gconf->has_logfile = true;
812 s->glfs = qemu_gluster_init(gconf, filename, options, errp);
813 if (!s->glfs) {
814 ret = -errno;
815 goto out;
818 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT
819 /* Without this, if fsync fails for a recoverable reason (for instance,
820 * ENOSPC), gluster will dump its cache, preventing retries. This means
821 * almost certain data loss. Not all gluster versions support the
822 * 'resync-failed-syncs-after-fsync' key value, but there is no way to
823 * discover during runtime if it is supported (this api returns success for
824 * unknown key/value pairs) */
825 ret = glfs_set_xlator_option(s->glfs, "*-write-behind",
826 "resync-failed-syncs-after-fsync",
827 "on");
828 if (ret < 0) {
829 error_setg_errno(errp, errno, "Unable to set xlator key/value pair");
830 ret = -errno;
831 goto out;
833 #endif
835 qemu_gluster_parse_flags(bdrv_flags, &open_flags);
837 s->fd = glfs_open(s->glfs, gconf->path, open_flags);
838 if (!s->fd) {
839 ret = -errno;
842 s->supports_seek_data = qemu_gluster_test_seek(s->fd);
844 out:
845 qemu_opts_del(opts);
846 qapi_free_BlockdevOptionsGluster(gconf);
847 if (!ret) {
848 return ret;
850 g_free(s->logfile);
851 if (s->fd) {
852 glfs_close(s->fd);
855 glfs_clear_preopened(s->glfs);
857 return ret;
860 static int qemu_gluster_reopen_prepare(BDRVReopenState *state,
861 BlockReopenQueue *queue, Error **errp)
863 int ret = 0;
864 BDRVGlusterState *s;
865 BDRVGlusterReopenState *reop_s;
866 BlockdevOptionsGluster *gconf;
867 int open_flags = 0;
869 assert(state != NULL);
870 assert(state->bs != NULL);
872 s = state->bs->opaque;
874 state->opaque = g_new0(BDRVGlusterReopenState, 1);
875 reop_s = state->opaque;
877 qemu_gluster_parse_flags(state->flags, &open_flags);
879 gconf = g_new0(BlockdevOptionsGluster, 1);
880 gconf->debug = s->debug;
881 gconf->has_debug = true;
882 gconf->logfile = g_strdup(s->logfile);
883 gconf->has_logfile = true;
884 reop_s->glfs = qemu_gluster_init(gconf, state->bs->filename, NULL, errp);
885 if (reop_s->glfs == NULL) {
886 ret = -errno;
887 goto exit;
890 #ifdef CONFIG_GLUSTERFS_XLATOR_OPT
891 ret = glfs_set_xlator_option(reop_s->glfs, "*-write-behind",
892 "resync-failed-syncs-after-fsync", "on");
893 if (ret < 0) {
894 error_setg_errno(errp, errno, "Unable to set xlator key/value pair");
895 ret = -errno;
896 goto exit;
898 #endif
900 reop_s->fd = glfs_open(reop_s->glfs, gconf->path, open_flags);
901 if (reop_s->fd == NULL) {
902 /* reops->glfs will be cleaned up in _abort */
903 ret = -errno;
904 goto exit;
907 exit:
908 /* state->opaque will be freed in either the _abort or _commit */
909 qapi_free_BlockdevOptionsGluster(gconf);
910 return ret;
913 static void qemu_gluster_reopen_commit(BDRVReopenState *state)
915 BDRVGlusterReopenState *reop_s = state->opaque;
916 BDRVGlusterState *s = state->bs->opaque;
919 /* close the old */
920 if (s->fd) {
921 glfs_close(s->fd);
924 glfs_clear_preopened(s->glfs);
926 /* use the newly opened image / connection */
927 s->fd = reop_s->fd;
928 s->glfs = reop_s->glfs;
930 g_free(state->opaque);
931 state->opaque = NULL;
933 return;
937 static void qemu_gluster_reopen_abort(BDRVReopenState *state)
939 BDRVGlusterReopenState *reop_s = state->opaque;
941 if (reop_s == NULL) {
942 return;
945 if (reop_s->fd) {
946 glfs_close(reop_s->fd);
949 glfs_clear_preopened(reop_s->glfs);
951 g_free(state->opaque);
952 state->opaque = NULL;
954 return;
957 #ifdef CONFIG_GLUSTERFS_ZEROFILL
958 static coroutine_fn int qemu_gluster_co_pwrite_zeroes(BlockDriverState *bs,
959 int64_t offset,
960 int size,
961 BdrvRequestFlags flags)
963 int ret;
964 GlusterAIOCB acb;
965 BDRVGlusterState *s = bs->opaque;
967 acb.size = size;
968 acb.ret = 0;
969 acb.coroutine = qemu_coroutine_self();
970 acb.aio_context = bdrv_get_aio_context(bs);
972 ret = glfs_zerofill_async(s->fd, offset, size, gluster_finish_aiocb, &acb);
973 if (ret < 0) {
974 return -errno;
977 qemu_coroutine_yield();
978 return acb.ret;
980 #endif
982 static int qemu_gluster_do_truncate(struct glfs_fd *fd, int64_t offset,
983 PreallocMode prealloc, Error **errp)
985 int64_t current_length;
987 current_length = glfs_lseek(fd, 0, SEEK_END);
988 if (current_length < 0) {
989 error_setg_errno(errp, errno, "Failed to determine current size");
990 return -errno;
993 if (current_length > offset && prealloc != PREALLOC_MODE_OFF) {
994 error_setg(errp, "Cannot use preallocation for shrinking files");
995 return -ENOTSUP;
998 if (current_length == offset) {
999 return 0;
1002 switch (prealloc) {
1003 #ifdef CONFIG_GLUSTERFS_FALLOCATE
1004 case PREALLOC_MODE_FALLOC:
1005 if (glfs_fallocate(fd, 0, current_length, offset - current_length)) {
1006 error_setg_errno(errp, errno, "Could not preallocate data");
1007 return -errno;
1009 break;
1010 #endif /* CONFIG_GLUSTERFS_FALLOCATE */
1011 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1012 case PREALLOC_MODE_FULL:
1013 if (glfs_ftruncate(fd, offset)) {
1014 error_setg_errno(errp, errno, "Could not resize file");
1015 return -errno;
1017 if (glfs_zerofill(fd, current_length, offset - current_length)) {
1018 error_setg_errno(errp, errno, "Could not zerofill the new area");
1019 return -errno;
1021 break;
1022 #endif /* CONFIG_GLUSTERFS_ZEROFILL */
1023 case PREALLOC_MODE_OFF:
1024 if (glfs_ftruncate(fd, offset)) {
1025 error_setg_errno(errp, errno, "Could not resize file");
1026 return -errno;
1028 break;
1029 default:
1030 error_setg(errp, "Unsupported preallocation mode: %s",
1031 PreallocMode_str(prealloc));
1032 return -EINVAL;
1035 return 0;
1038 static int qemu_gluster_co_create(BlockdevCreateOptions *options,
1039 Error **errp)
1041 BlockdevCreateOptionsGluster *opts = &options->u.gluster;
1042 struct glfs *glfs;
1043 struct glfs_fd *fd = NULL;
1044 int ret = 0;
1046 assert(options->driver == BLOCKDEV_DRIVER_GLUSTER);
1048 glfs = qemu_gluster_glfs_init(opts->location, errp);
1049 if (!glfs) {
1050 ret = -errno;
1051 goto out;
1054 fd = glfs_creat(glfs, opts->location->path,
1055 O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR | S_IWUSR);
1056 if (!fd) {
1057 ret = -errno;
1058 goto out;
1061 ret = qemu_gluster_do_truncate(fd, opts->size, opts->preallocation, errp);
1063 out:
1064 if (fd) {
1065 if (glfs_close(fd) != 0 && ret == 0) {
1066 ret = -errno;
1069 glfs_clear_preopened(glfs);
1070 return ret;
1073 static int coroutine_fn qemu_gluster_co_create_opts(const char *filename,
1074 QemuOpts *opts,
1075 Error **errp)
1077 BlockdevCreateOptions *options;
1078 BlockdevCreateOptionsGluster *gopts;
1079 BlockdevOptionsGluster *gconf;
1080 char *tmp = NULL;
1081 Error *local_err = NULL;
1082 int ret;
1084 options = g_new0(BlockdevCreateOptions, 1);
1085 options->driver = BLOCKDEV_DRIVER_GLUSTER;
1086 gopts = &options->u.gluster;
1088 gconf = g_new0(BlockdevOptionsGluster, 1);
1089 gopts->location = gconf;
1091 gopts->size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
1092 BDRV_SECTOR_SIZE);
1094 tmp = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
1095 gopts->preallocation = qapi_enum_parse(&PreallocMode_lookup, tmp,
1096 PREALLOC_MODE_OFF, &local_err);
1097 g_free(tmp);
1098 if (local_err) {
1099 error_propagate(errp, local_err);
1100 ret = -EINVAL;
1101 goto fail;
1104 gconf->debug = qemu_opt_get_number_del(opts, GLUSTER_OPT_DEBUG,
1105 GLUSTER_DEBUG_DEFAULT);
1106 if (gconf->debug < 0) {
1107 gconf->debug = 0;
1108 } else if (gconf->debug > GLUSTER_DEBUG_MAX) {
1109 gconf->debug = GLUSTER_DEBUG_MAX;
1111 gconf->has_debug = true;
1113 gconf->logfile = qemu_opt_get_del(opts, GLUSTER_OPT_LOGFILE);
1114 if (!gconf->logfile) {
1115 gconf->logfile = g_strdup(GLUSTER_LOGFILE_DEFAULT);
1117 gconf->has_logfile = true;
1119 ret = qemu_gluster_parse(gconf, filename, NULL, errp);
1120 if (ret < 0) {
1121 goto fail;
1124 ret = qemu_gluster_co_create(options, errp);
1125 if (ret < 0) {
1126 goto fail;
1129 ret = 0;
1130 fail:
1131 qapi_free_BlockdevCreateOptions(options);
1132 return ret;
1135 static coroutine_fn int qemu_gluster_co_rw(BlockDriverState *bs,
1136 int64_t sector_num, int nb_sectors,
1137 QEMUIOVector *qiov, int write)
1139 int ret;
1140 GlusterAIOCB acb;
1141 BDRVGlusterState *s = bs->opaque;
1142 size_t size = nb_sectors * BDRV_SECTOR_SIZE;
1143 off_t offset = sector_num * BDRV_SECTOR_SIZE;
1145 acb.size = size;
1146 acb.ret = 0;
1147 acb.coroutine = qemu_coroutine_self();
1148 acb.aio_context = bdrv_get_aio_context(bs);
1150 if (write) {
1151 ret = glfs_pwritev_async(s->fd, qiov->iov, qiov->niov, offset, 0,
1152 gluster_finish_aiocb, &acb);
1153 } else {
1154 ret = glfs_preadv_async(s->fd, qiov->iov, qiov->niov, offset, 0,
1155 gluster_finish_aiocb, &acb);
1158 if (ret < 0) {
1159 return -errno;
1162 qemu_coroutine_yield();
1163 return acb.ret;
1166 static int qemu_gluster_truncate(BlockDriverState *bs, int64_t offset,
1167 PreallocMode prealloc, Error **errp)
1169 BDRVGlusterState *s = bs->opaque;
1170 return qemu_gluster_do_truncate(s->fd, offset, prealloc, errp);
1173 static coroutine_fn int qemu_gluster_co_readv(BlockDriverState *bs,
1174 int64_t sector_num,
1175 int nb_sectors,
1176 QEMUIOVector *qiov)
1178 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 0);
1181 static coroutine_fn int qemu_gluster_co_writev(BlockDriverState *bs,
1182 int64_t sector_num,
1183 int nb_sectors,
1184 QEMUIOVector *qiov)
1186 return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 1);
1189 static void qemu_gluster_close(BlockDriverState *bs)
1191 BDRVGlusterState *s = bs->opaque;
1193 g_free(s->logfile);
1194 if (s->fd) {
1195 glfs_close(s->fd);
1196 s->fd = NULL;
1198 glfs_clear_preopened(s->glfs);
1201 static coroutine_fn int qemu_gluster_co_flush_to_disk(BlockDriverState *bs)
1203 int ret;
1204 GlusterAIOCB acb;
1205 BDRVGlusterState *s = bs->opaque;
1207 acb.size = 0;
1208 acb.ret = 0;
1209 acb.coroutine = qemu_coroutine_self();
1210 acb.aio_context = bdrv_get_aio_context(bs);
1212 ret = glfs_fsync_async(s->fd, gluster_finish_aiocb, &acb);
1213 if (ret < 0) {
1214 ret = -errno;
1215 goto error;
1218 qemu_coroutine_yield();
1219 if (acb.ret < 0) {
1220 ret = acb.ret;
1221 goto error;
1224 return acb.ret;
1226 error:
1227 /* Some versions of Gluster (3.5.6 -> 3.5.8?) will not retain its cache
1228 * after a fsync failure, so we have no way of allowing the guest to safely
1229 * continue. Gluster versions prior to 3.5.6 don't retain the cache
1230 * either, but will invalidate the fd on error, so this is again our only
1231 * option.
1233 * The 'resync-failed-syncs-after-fsync' xlator option for the
1234 * write-behind cache will cause later gluster versions to retain its
1235 * cache after error, so long as the fd remains open. However, we
1236 * currently have no way of knowing if this option is supported.
1238 * TODO: Once gluster provides a way for us to determine if the option
1239 * is supported, bypass the closure and setting drv to NULL. */
1240 qemu_gluster_close(bs);
1241 bs->drv = NULL;
1242 return ret;
1245 #ifdef CONFIG_GLUSTERFS_DISCARD
1246 static coroutine_fn int qemu_gluster_co_pdiscard(BlockDriverState *bs,
1247 int64_t offset, int size)
1249 int ret;
1250 GlusterAIOCB acb;
1251 BDRVGlusterState *s = bs->opaque;
1253 acb.size = 0;
1254 acb.ret = 0;
1255 acb.coroutine = qemu_coroutine_self();
1256 acb.aio_context = bdrv_get_aio_context(bs);
1258 ret = glfs_discard_async(s->fd, offset, size, gluster_finish_aiocb, &acb);
1259 if (ret < 0) {
1260 return -errno;
1263 qemu_coroutine_yield();
1264 return acb.ret;
1266 #endif
1268 static int64_t qemu_gluster_getlength(BlockDriverState *bs)
1270 BDRVGlusterState *s = bs->opaque;
1271 int64_t ret;
1273 ret = glfs_lseek(s->fd, 0, SEEK_END);
1274 if (ret < 0) {
1275 return -errno;
1276 } else {
1277 return ret;
1281 static int64_t qemu_gluster_allocated_file_size(BlockDriverState *bs)
1283 BDRVGlusterState *s = bs->opaque;
1284 struct stat st;
1285 int ret;
1287 ret = glfs_fstat(s->fd, &st);
1288 if (ret < 0) {
1289 return -errno;
1290 } else {
1291 return st.st_blocks * 512;
1295 static int qemu_gluster_has_zero_init(BlockDriverState *bs)
1297 /* GlusterFS volume could be backed by a block device */
1298 return 0;
1302 * Find allocation range in @bs around offset @start.
1303 * May change underlying file descriptor's file offset.
1304 * If @start is not in a hole, store @start in @data, and the
1305 * beginning of the next hole in @hole, and return 0.
1306 * If @start is in a non-trailing hole, store @start in @hole and the
1307 * beginning of the next non-hole in @data, and return 0.
1308 * If @start is in a trailing hole or beyond EOF, return -ENXIO.
1309 * If we can't find out, return a negative errno other than -ENXIO.
1311 * (Shamefully copied from file-posix.c, only miniscule adaptions.)
1313 static int find_allocation(BlockDriverState *bs, off_t start,
1314 off_t *data, off_t *hole)
1316 BDRVGlusterState *s = bs->opaque;
1318 if (!s->supports_seek_data) {
1319 goto exit;
1322 #if defined SEEK_HOLE && defined SEEK_DATA
1323 off_t offs;
1326 * SEEK_DATA cases:
1327 * D1. offs == start: start is in data
1328 * D2. offs > start: start is in a hole, next data at offs
1329 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole
1330 * or start is beyond EOF
1331 * If the latter happens, the file has been truncated behind
1332 * our back since we opened it. All bets are off then.
1333 * Treating like a trailing hole is simplest.
1334 * D4. offs < 0, errno != ENXIO: we learned nothing
1336 offs = glfs_lseek(s->fd, start, SEEK_DATA);
1337 if (offs < 0) {
1338 return -errno; /* D3 or D4 */
1341 if (offs < start) {
1342 /* This is not a valid return by lseek(). We are safe to just return
1343 * -EIO in this case, and we'll treat it like D4. Unfortunately some
1344 * versions of gluster server will return offs < start, so an assert
1345 * here will unnecessarily abort QEMU. */
1346 return -EIO;
1349 if (offs > start) {
1350 /* D2: in hole, next data at offs */
1351 *hole = start;
1352 *data = offs;
1353 return 0;
1356 /* D1: in data, end not yet known */
1359 * SEEK_HOLE cases:
1360 * H1. offs == start: start is in a hole
1361 * If this happens here, a hole has been dug behind our back
1362 * since the previous lseek().
1363 * H2. offs > start: either start is in data, next hole at offs,
1364 * or start is in trailing hole, EOF at offs
1365 * Linux treats trailing holes like any other hole: offs ==
1366 * start. Solaris seeks to EOF instead: offs > start (blech).
1367 * If that happens here, a hole has been dug behind our back
1368 * since the previous lseek().
1369 * H3. offs < 0, errno = ENXIO: start is beyond EOF
1370 * If this happens, the file has been truncated behind our
1371 * back since we opened it. Treat it like a trailing hole.
1372 * H4. offs < 0, errno != ENXIO: we learned nothing
1373 * Pretend we know nothing at all, i.e. "forget" about D1.
1375 offs = glfs_lseek(s->fd, start, SEEK_HOLE);
1376 if (offs < 0) {
1377 return -errno; /* D1 and (H3 or H4) */
1380 if (offs < start) {
1381 /* This is not a valid return by lseek(). We are safe to just return
1382 * -EIO in this case, and we'll treat it like H4. Unfortunately some
1383 * versions of gluster server will return offs < start, so an assert
1384 * here will unnecessarily abort QEMU. */
1385 return -EIO;
1388 if (offs > start) {
1390 * D1 and H2: either in data, next hole at offs, or it was in
1391 * data but is now in a trailing hole. In the latter case,
1392 * all bets are off. Treating it as if it there was data all
1393 * the way to EOF is safe, so simply do that.
1395 *data = start;
1396 *hole = offs;
1397 return 0;
1400 /* D1 and H1 */
1401 return -EBUSY;
1402 #endif
1404 exit:
1405 return -ENOTSUP;
1409 * Returns the allocation status of the specified offset.
1411 * The block layer guarantees 'offset' and 'bytes' are within bounds.
1413 * 'pnum' is set to the number of bytes (including and immediately following
1414 * the specified offset) that are known to be in the same
1415 * allocated/unallocated state.
1417 * 'bytes' is the max value 'pnum' should be set to.
1419 * (Based on raw_co_block_status() from file-posix.c.)
1421 static int coroutine_fn qemu_gluster_co_block_status(BlockDriverState *bs,
1422 bool want_zero,
1423 int64_t offset,
1424 int64_t bytes,
1425 int64_t *pnum,
1426 int64_t *map,
1427 BlockDriverState **file)
1429 BDRVGlusterState *s = bs->opaque;
1430 off_t data = 0, hole = 0;
1431 int ret = -EINVAL;
1433 if (!s->fd) {
1434 return ret;
1437 if (!want_zero) {
1438 *pnum = bytes;
1439 *map = offset;
1440 *file = bs;
1441 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
1444 ret = find_allocation(bs, offset, &data, &hole);
1445 if (ret == -ENXIO) {
1446 /* Trailing hole */
1447 *pnum = bytes;
1448 ret = BDRV_BLOCK_ZERO;
1449 } else if (ret < 0) {
1450 /* No info available, so pretend there are no holes */
1451 *pnum = bytes;
1452 ret = BDRV_BLOCK_DATA;
1453 } else if (data == offset) {
1454 /* On a data extent, compute bytes to the end of the extent,
1455 * possibly including a partial sector at EOF. */
1456 *pnum = MIN(bytes, hole - offset);
1457 ret = BDRV_BLOCK_DATA;
1458 } else {
1459 /* On a hole, compute bytes to the beginning of the next extent. */
1460 assert(hole == offset);
1461 *pnum = MIN(bytes, data - offset);
1462 ret = BDRV_BLOCK_ZERO;
1465 *map = offset;
1466 *file = bs;
1468 return ret | BDRV_BLOCK_OFFSET_VALID;
1472 static BlockDriver bdrv_gluster = {
1473 .format_name = "gluster",
1474 .protocol_name = "gluster",
1475 .instance_size = sizeof(BDRVGlusterState),
1476 .bdrv_needs_filename = false,
1477 .bdrv_file_open = qemu_gluster_open,
1478 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1479 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1480 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1481 .bdrv_close = qemu_gluster_close,
1482 .bdrv_co_create = qemu_gluster_co_create,
1483 .bdrv_co_create_opts = qemu_gluster_co_create_opts,
1484 .bdrv_getlength = qemu_gluster_getlength,
1485 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
1486 .bdrv_truncate = qemu_gluster_truncate,
1487 .bdrv_co_readv = qemu_gluster_co_readv,
1488 .bdrv_co_writev = qemu_gluster_co_writev,
1489 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1490 .bdrv_has_zero_init = qemu_gluster_has_zero_init,
1491 #ifdef CONFIG_GLUSTERFS_DISCARD
1492 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1493 #endif
1494 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1495 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1496 #endif
1497 .bdrv_co_block_status = qemu_gluster_co_block_status,
1498 .create_opts = &qemu_gluster_create_opts,
1501 static BlockDriver bdrv_gluster_tcp = {
1502 .format_name = "gluster",
1503 .protocol_name = "gluster+tcp",
1504 .instance_size = sizeof(BDRVGlusterState),
1505 .bdrv_needs_filename = false,
1506 .bdrv_file_open = qemu_gluster_open,
1507 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1508 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1509 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1510 .bdrv_close = qemu_gluster_close,
1511 .bdrv_co_create = qemu_gluster_co_create,
1512 .bdrv_co_create_opts = qemu_gluster_co_create_opts,
1513 .bdrv_getlength = qemu_gluster_getlength,
1514 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
1515 .bdrv_truncate = qemu_gluster_truncate,
1516 .bdrv_co_readv = qemu_gluster_co_readv,
1517 .bdrv_co_writev = qemu_gluster_co_writev,
1518 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1519 .bdrv_has_zero_init = qemu_gluster_has_zero_init,
1520 #ifdef CONFIG_GLUSTERFS_DISCARD
1521 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1522 #endif
1523 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1524 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1525 #endif
1526 .bdrv_co_block_status = qemu_gluster_co_block_status,
1527 .create_opts = &qemu_gluster_create_opts,
1530 static BlockDriver bdrv_gluster_unix = {
1531 .format_name = "gluster",
1532 .protocol_name = "gluster+unix",
1533 .instance_size = sizeof(BDRVGlusterState),
1534 .bdrv_needs_filename = true,
1535 .bdrv_file_open = qemu_gluster_open,
1536 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1537 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1538 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1539 .bdrv_close = qemu_gluster_close,
1540 .bdrv_co_create = qemu_gluster_co_create,
1541 .bdrv_co_create_opts = qemu_gluster_co_create_opts,
1542 .bdrv_getlength = qemu_gluster_getlength,
1543 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
1544 .bdrv_truncate = qemu_gluster_truncate,
1545 .bdrv_co_readv = qemu_gluster_co_readv,
1546 .bdrv_co_writev = qemu_gluster_co_writev,
1547 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1548 .bdrv_has_zero_init = qemu_gluster_has_zero_init,
1549 #ifdef CONFIG_GLUSTERFS_DISCARD
1550 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1551 #endif
1552 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1553 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1554 #endif
1555 .bdrv_co_block_status = qemu_gluster_co_block_status,
1556 .create_opts = &qemu_gluster_create_opts,
1559 /* rdma is deprecated (actually never supported for volfile fetch).
1560 * Let's maintain it for the protocol compatibility, to make sure things
1561 * won't break immediately. For now, gluster+rdma will fall back to gluster+tcp
1562 * protocol with a warning.
1563 * TODO: remove gluster+rdma interface support
1565 static BlockDriver bdrv_gluster_rdma = {
1566 .format_name = "gluster",
1567 .protocol_name = "gluster+rdma",
1568 .instance_size = sizeof(BDRVGlusterState),
1569 .bdrv_needs_filename = true,
1570 .bdrv_file_open = qemu_gluster_open,
1571 .bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
1572 .bdrv_reopen_commit = qemu_gluster_reopen_commit,
1573 .bdrv_reopen_abort = qemu_gluster_reopen_abort,
1574 .bdrv_close = qemu_gluster_close,
1575 .bdrv_co_create = qemu_gluster_co_create,
1576 .bdrv_co_create_opts = qemu_gluster_co_create_opts,
1577 .bdrv_getlength = qemu_gluster_getlength,
1578 .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
1579 .bdrv_truncate = qemu_gluster_truncate,
1580 .bdrv_co_readv = qemu_gluster_co_readv,
1581 .bdrv_co_writev = qemu_gluster_co_writev,
1582 .bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
1583 .bdrv_has_zero_init = qemu_gluster_has_zero_init,
1584 #ifdef CONFIG_GLUSTERFS_DISCARD
1585 .bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
1586 #endif
1587 #ifdef CONFIG_GLUSTERFS_ZEROFILL
1588 .bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
1589 #endif
1590 .bdrv_co_block_status = qemu_gluster_co_block_status,
1591 .create_opts = &qemu_gluster_create_opts,
1594 static void bdrv_gluster_init(void)
1596 bdrv_register(&bdrv_gluster_rdma);
1597 bdrv_register(&bdrv_gluster_unix);
1598 bdrv_register(&bdrv_gluster_tcp);
1599 bdrv_register(&bdrv_gluster);
1602 block_init(bdrv_gluster_init);