summaryrefslogtreecommitdiffstats
path: root/qemu/block/gluster.c
blob: 1eb3a8c398eb29450dd65f216744bec36b0b5ddc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
/*
 * GlusterFS backend for QEMU
 *
 * Copyright (C) 2012 Bharata B Rao <bharata@linux.vnet.ibm.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 *
 */
#include <glusterfs/api/glfs.h>
#include "block/block_int.h"
#include "qemu/uri.h"

typedef struct GlusterAIOCB {
    int64_t size;
    int ret;
    QEMUBH *bh;
    Coroutine *coroutine;
    AioContext *aio_context;
} GlusterAIOCB;

typedef struct BDRVGlusterState {
    struct glfs *glfs;
    struct glfs_fd *fd;
} BDRVGlusterState;

typedef struct GlusterConf {
    char *server;
    int port;
    char *volname;
    char *image;
    char *transport;
} GlusterConf;

static void qemu_gluster_gconf_free(GlusterConf *gconf)
{
    if (gconf) {
        g_free(gconf->server);
        g_free(gconf->volname);
        g_free(gconf->image);
        g_free(gconf->transport);
        g_free(gconf);
    }
}

static int parse_volume_options(GlusterConf *gconf, char *path)
{
    char *p, *q;

    if (!path) {
        return -EINVAL;
    }

    /* volume */
    p = q = path + strspn(path, "/");
    p += strcspn(p, "/");
    if (*p == '\0') {
        return -EINVAL;
    }
    gconf->volname = g_strndup(q, p - q);

    /* image */
    p += strspn(p, "/");
    if (*p == '\0') {
        return -EINVAL;
    }
    gconf->image = g_strdup(p);
    return 0;
}

/*
 * file=gluster[+transport]://[server[:port]]/volname/image[?socket=...]
 *
 * 'gluster' is the protocol.
 *
 * 'transport' specifies the transport type used to connect to gluster
 * management daemon (glusterd). Valid transport types are
 * tcp, unix and rdma. If a transport type isn't specified, then tcp
 * type is assumed.
 *
 * 'server' specifies the server where the volume file specification for
 * the given volume resides. This can be either hostname, ipv4 address
 * or ipv6 address. ipv6 address needs to be within square brackets [ ].
 * If transport type is 'unix', then 'server' field should not be specified.
 * The 'socket' field needs to be populated with the path to unix domain
 * socket.
 *
 * 'port' is the port number on which glusterd is listening. This is optional
 * and if not specified, QEMU will send 0 which will make gluster to use the
 * default port. If the transport type is unix, then 'port' should not be
 * specified.
 *
 * 'volname' is the name of the gluster volume which contains the VM image.
 *
 * 'image' is the path to the actual VM image that resides on gluster volume.
 *
 * Examples:
 *
 * file=gluster://1.2.3.4/testvol/a.img
 * file=gluster+tcp://1.2.3.4/testvol/a.img
 * file=gluster+tcp://1.2.3.4:24007/testvol/dir/a.img
 * file=gluster+tcp://[1:2:3:4:5:6:7:8]/testvol/dir/a.img
 * file=gluster+tcp://[1:2:3:4:5:6:7:8]:24007/testvol/dir/a.img
 * file=gluster+tcp://server.domain.com:24007/testvol/dir/a.img
 * file=gluster+unix:///testvol/dir/a.img?socket=/tmp/glusterd.socket
 * file=gluster+rdma://1.2.3.4:24007/testvol/a.img
 */
static int qemu_gluster_parseuri(GlusterConf *gconf, const char *filename)
{
    URI *uri;
    QueryParams *qp = NULL;
    bool is_unix = false;
    int ret = 0;

    uri = uri_parse(filename);
    if (!uri) {
        return -EINVAL;
    }

    /* transport */
    if (!uri->scheme || !strcmp(uri->scheme, "gluster")) {
        gconf->transport = g_strdup("tcp");
    } else if (!strcmp(uri->scheme, "gluster+tcp")) {
        gconf->transport = g_strdup("tcp");
    } else if (!strcmp(uri->scheme, "gluster+unix")) {
        gconf->transport = g_strdup("unix");
        is_unix = true;
    } else if (!strcmp(uri->scheme, "gluster+rdma")) {
        gconf->transport = g_strdup("rdma");
    } else {
        ret = -EINVAL;
        goto out;
    }

    ret = parse_volume_options(gconf, uri->path);
    if (ret < 0) {
        goto out;
    }

    qp = query_params_parse(uri->query);
    if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) {
        ret = -EINVAL;
        goto out;
    }

    if (is_unix) {
        if (uri->server || uri->port) {
            ret = -EINVAL;
            goto out;
        }
        if (strcmp(qp->p[0].name, "socket")) {
            ret = -EINVAL;
            goto out;
        }
        gconf->server = g_strdup(qp->p[0].value);
    } else {
        gconf->server = g_strdup(uri->server ? uri->server : "localhost");
        gconf->port = uri->port;
    }

out:
    if (qp) {
        query_params_free(qp);
    }
    uri_free(uri);
    return ret;
}

static struct glfs *qemu_gluster_init(GlusterConf *gconf, const char *filename,
                                      Error **errp)
{
    struct glfs *glfs = NULL;
    int ret;
    int old_errno;

    ret = qemu_gluster_parseuri(gconf, filename);
    if (ret < 0) {
        error_setg(errp, "Usage: file=gluster[+transport]://[server[:port]]/"
                   "volname/image[?socket=...]");
        errno = -ret;
        goto out;
    }

    glfs = glfs_new(gconf->volname);
    if (!glfs) {
        goto out;
    }

    ret = glfs_set_volfile_server(glfs, gconf->transport, gconf->server,
            gconf->port);
    if (ret < 0) {
        goto out;
    }

    /*
     * TODO: Use GF_LOG_ERROR instead of hard code value of 4 here when
     * GlusterFS makes GF_LOG_* macros available to libgfapi users.
     */
    ret = glfs_set_logging(glfs, "-", 4);
    if (ret < 0) {
        goto out;
    }

    ret = glfs_init(glfs);
    if (ret) {
        error_setg_errno(errp, errno,
                         "Gluster connection failed for server=%s port=%d "
                         "volume=%s image=%s transport=%s", gconf->server,
                         gconf->port, gconf->volname, gconf->image,
                         gconf->transport);

        /* glfs_init sometimes doesn't set errno although docs suggest that */
        if (errno == 0)
            errno = EINVAL;

        goto out;
    }
    return glfs;

out:
    if (glfs) {
        old_errno = errno;
        glfs_fini(glfs);
        errno = old_errno;
    }
    return NULL;
}

static void qemu_gluster_complete_aio(void *opaque)
{
    GlusterAIOCB *acb = (GlusterAIOCB *)opaque;

    qemu_bh_delete(acb->bh);
    acb->bh = NULL;
    qemu_coroutine_enter(acb->coroutine, NULL);
}

/*
 * AIO callback routine called from GlusterFS thread.
 */
static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret, void *arg)
{
    GlusterAIOCB *acb = (GlusterAIOCB *)arg;

    if (!ret || ret == acb->size) {
        acb->ret = 0; /* Success */
    } else if (ret < 0) {
        acb->ret = ret; /* Read/Write failed */
    } else {
        acb->ret = -EIO; /* Partial read/write - fail it */
    }

    acb->bh = aio_bh_new(acb->aio_context, qemu_gluster_complete_aio, acb);
    qemu_bh_schedule(acb->bh);
}

/* TODO Convert to fine grained options */
static QemuOptsList runtime_opts = {
    .name = "gluster",
    .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
    .desc = {
        {
            .name = "filename",
            .type = QEMU_OPT_STRING,
            .help = "URL to the gluster image",
        },
        { /* end of list */ }
    },
};

static void qemu_gluster_parse_flags(int bdrv_flags, int *open_flags)
{
    assert(open_flags != NULL);

    *open_flags |= O_BINARY;

    if (bdrv_flags & BDRV_O_RDWR) {
        *open_flags |= O_RDWR;
    } else {
        *open_flags |= O_RDONLY;
    }

    if ((bdrv_flags & BDRV_O_NOCACHE)) {
        *open_flags |= O_DIRECT;
    }
}

static int qemu_gluster_open(BlockDriverState *bs,  QDict *options,
                             int bdrv_flags, Error **errp)
{
    BDRVGlusterState *s = bs->opaque;
    int open_flags = 0;
    int ret = 0;
    GlusterConf *gconf = g_new0(GlusterConf, 1);
    QemuOpts *opts;
    Error *local_err = NULL;
    const char *filename;

    opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
    qemu_opts_absorb_qdict(opts, options, &local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        ret = -EINVAL;
        goto out;
    }

    filename = qemu_opt_get(opts, "filename");

    s->glfs = qemu_gluster_init(gconf, filename, errp);
    if (!s->glfs) {
        ret = -errno;
        goto out;
    }

    qemu_gluster_parse_flags(bdrv_flags, &open_flags);

    s->fd = glfs_open(s->glfs, gconf->image, open_flags);
    if (!s->fd) {
        ret = -errno;
    }

out:
    qemu_opts_del(opts);
    qemu_gluster_gconf_free(gconf);
    if (!ret) {
        return ret;
    }
    if (s->fd) {
        glfs_close(s->fd);
    }
    if (s->glfs) {
        glfs_fini(s->glfs);
    }
    return ret;
}

typedef struct BDRVGlusterReopenState {
    struct glfs *glfs;
    struct glfs_fd *fd;
} BDRVGlusterReopenState;


static int qemu_gluster_reopen_prepare(BDRVReopenState *state,
                                       BlockReopenQueue *queue, Error **errp)
{
    int ret = 0;
    BDRVGlusterReopenState *reop_s;
    GlusterConf *gconf = NULL;
    int open_flags = 0;

    assert(state != NULL);
    assert(state->bs != NULL);

    state->opaque = g_new0(BDRVGlusterReopenState, 1);
    reop_s = state->opaque;

    qemu_gluster_parse_flags(state->flags, &open_flags);

    gconf = g_new0(GlusterConf, 1);

    reop_s->glfs = qemu_gluster_init(gconf, state->bs->filename, errp);
    if (reop_s->glfs == NULL) {
        ret = -errno;
        goto exit;
    }

    reop_s->fd = glfs_open(reop_s->glfs, gconf->image, open_flags);
    if (reop_s->fd == NULL) {
        /* reops->glfs will be cleaned up in _abort */
        ret = -errno;
        goto exit;
    }

exit:
    /* state->opaque will be freed in either the _abort or _commit */
    qemu_gluster_gconf_free(gconf);
    return ret;
}

static void qemu_gluster_reopen_commit(BDRVReopenState *state)
{
    BDRVGlusterReopenState *reop_s = state->opaque;
    BDRVGlusterState *s = state->bs->opaque;


    /* close the old */
    if (s->fd) {
        glfs_close(s->fd);
    }
    if (s->glfs) {
        glfs_fini(s->glfs);
    }

    /* use the newly opened image / connection */
    s->fd         = reop_s->fd;
    s->glfs       = reop_s->glfs;

    g_free(state->opaque);
    state->opaque = NULL;

    return;
}


static void qemu_gluster_reopen_abort(BDRVReopenState *state)
{
    BDRVGlusterReopenState *reop_s = state->opaque;

    if (reop_s == NULL) {
        return;
    }

    if (reop_s->fd) {
        glfs_close(reop_s->fd);
    }

    if (reop_s->glfs) {
        glfs_fini(reop_s->glfs);
    }

    g_free(state->opaque);
    state->opaque = NULL;

    return;
}

#ifdef CONFIG_GLUSTERFS_ZEROFILL
static coroutine_fn int qemu_gluster_co_write_zeroes(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors, BdrvRequestFlags flags)
{
    int ret;
    GlusterAIOCB *acb = g_slice_new(GlusterAIOCB);
    BDRVGlusterState *s = bs->opaque;
    off_t size = nb_sectors * BDRV_SECTOR_SIZE;
    off_t offset = sector_num * BDRV_SECTOR_SIZE;

    acb->size = size;
    acb->ret = 0;
    acb->coroutine = qemu_coroutine_self();
    acb->aio_context = bdrv_get_aio_context(bs);

    ret = glfs_zerofill_async(s->fd, offset, size, &gluster_finish_aiocb, acb);
    if (ret < 0) {
        ret = -errno;
        goto out;
    }

    qemu_coroutine_yield();
    ret = acb->ret;

out:
    g_slice_free(GlusterAIOCB, acb);
    return ret;
}

static inline bool gluster_supports_zerofill(void)
{
    return 1;
}

static inline int qemu_gluster_zerofill(struct glfs_fd *fd, int64_t offset,
        int64_t size)
{
    return glfs_zerofill(fd, offset, size);
}

#else
static inline bool gluster_supports_zerofill(void)
{
    return 0;
}

static inline int qemu_gluster_zerofill(struct glfs_fd *fd, int64_t offset,
        int64_t size)
{
    return 0;
}
#endif

static int qemu_gluster_create(const char *filename,
                               QemuOpts *opts, Error **errp)
{
    struct glfs *glfs;
    struct glfs_fd *fd;
    int ret = 0;
    int prealloc = 0;
    int64_t total_size = 0;
    char *tmp = NULL;
    GlusterConf *gconf = g_new0(GlusterConf, 1);

    glfs = qemu_gluster_init(gconf, filename, errp);
    if (!glfs) {
        ret = -errno;
        goto out;
    }

    total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
                          BDRV_SECTOR_SIZE);

    tmp = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
    if (!tmp || !strcmp(tmp, "off")) {
        prealloc = 0;
    } else if (!strcmp(tmp, "full") &&
               gluster_supports_zerofill()) {
        prealloc = 1;
    } else {
        error_setg(errp, "Invalid preallocation mode: '%s'"
            " or GlusterFS doesn't support zerofill API",
            tmp);
        ret = -EINVAL;
        goto out;
    }

    fd = glfs_creat(glfs, gconf->image,
        O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR | S_IWUSR);
    if (!fd) {
        ret = -errno;
    } else {
        if (!glfs_ftruncate(fd, total_size)) {
            if (prealloc && qemu_gluster_zerofill(fd, 0, total_size)) {
                ret = -errno;
            }
        } else {
            ret = -errno;
        }

        if (glfs_close(fd) != 0) {
            ret = -errno;
        }
    }
out:
    g_free(tmp);
    qemu_gluster_gconf_free(gconf);
    if (glfs) {
        glfs_fini(glfs);
    }
    return ret;
}

static coroutine_fn int qemu_gluster_co_rw(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, int write)
{
    int ret;
    GlusterAIOCB *acb = g_slice_new(GlusterAIOCB);
    BDRVGlusterState *s = bs->opaque;
    size_t size = nb_sectors * BDRV_SECTOR_SIZE;
    off_t offset = sector_num * BDRV_SECTOR_SIZE;

    acb->size = size;
    acb->ret = 0;
    acb->coroutine = qemu_coroutine_self();
    acb->aio_context = bdrv_get_aio_context(bs);

    if (write) {
        ret = glfs_pwritev_async(s->fd, qiov->iov, qiov->niov, offset, 0,
            &gluster_finish_aiocb, acb);
    } else {
        ret = glfs_preadv_async(s->fd, qiov->iov, qiov->niov, offset, 0,
            &gluster_finish_aiocb, acb);
    }

    if (ret < 0) {
        ret = -errno;
        goto out;
    }

    qemu_coroutine_yield();
    ret = acb->ret;

out:
    g_slice_free(GlusterAIOCB, acb);
    return ret;
}

static int qemu_gluster_truncate(BlockDriverState *bs, int64_t offset)
{
    int ret;
    BDRVGlusterState *s = bs->opaque;

    ret = glfs_ftruncate(s->fd, offset);
    if (ret < 0) {
        return -errno;
    }

    return 0;
}

static coroutine_fn int qemu_gluster_co_readv(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
{
    return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 0);
}

static coroutine_fn int qemu_gluster_co_writev(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
{
    return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 1);
}

static coroutine_fn int qemu_gluster_co_flush_to_disk(BlockDriverState *bs)
{
    int ret;
    GlusterAIOCB *acb = g_slice_new(GlusterAIOCB);
    BDRVGlusterState *s = bs->opaque;

    acb->size = 0;
    acb->ret = 0;
    acb->coroutine = qemu_coroutine_self();
    acb->aio_context = bdrv_get_aio_context(bs);

    ret = glfs_fsync_async(s->fd, &gluster_finish_aiocb, acb);
    if (ret < 0) {
        ret = -errno;
        goto out;
    }

    qemu_coroutine_yield();
    ret = acb->ret;

out:
    g_slice_free(GlusterAIOCB, acb);
    return ret;
}

#ifdef CONFIG_GLUSTERFS_DISCARD
static coroutine_fn int qemu_gluster_co_discard(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors)
{
    int ret;
    GlusterAIOCB *acb = g_slice_new(GlusterAIOCB);
    BDRVGlusterState *s = bs->opaque;
    size_t size = nb_sectors * BDRV_SECTOR_SIZE;
    off_t offset = sector_num * BDRV_SECTOR_SIZE;

    acb->size = 0;
    acb->ret = 0;
    acb->coroutine = qemu_coroutine_self();
    acb->aio_context = bdrv_get_aio_context(bs);

    ret = glfs_discard_async(s->fd, offset, size, &gluster_finish_aiocb, acb);
    if (ret < 0) {
        ret = -errno;
        goto out;
    }

    qemu_coroutine_yield();
    ret = acb->ret;

out:
    g_slice_free(GlusterAIOCB, acb);
    return ret;
}
#endif

static int64_t qemu_gluster_getlength(BlockDriverState *bs)
{
    BDRVGlusterState *s = bs->opaque;
    int64_t ret;

    ret = glfs_lseek(s->fd, 0, SEEK_END);
    if (ret < 0) {
        return -errno;
    } else {
        return ret;
    }
}

static int64_t qemu_gluster_allocated_file_size(BlockDriverState *bs)
{
    BDRVGlusterState *s = bs->opaque;
    struct stat st;
    int ret;

    ret = glfs_fstat(s->fd, &st);
    if (ret < 0) {
        return -errno;
    } else {
        return st.st_blocks * 512;
    }
}

static void qemu_gluster_close(BlockDriverState *bs)
{
    BDRVGlusterState *s = bs->opaque;

    if (s->fd) {
        glfs_close(s->fd);
        s->fd = NULL;
    }
    glfs_fini(s->glfs);
}

static int qemu_gluster_has_zero_init(BlockDriverState *bs)
{
    /* GlusterFS volume could be backed by a block device */
    return 0;
}

static QemuOptsList qemu_gluster_create_opts = {
    .name = "qemu-gluster-create-opts",
    .head = QTAILQ_HEAD_INITIALIZER(qemu_gluster_create_opts.head),
    .desc = {
        {
            .name = BLOCK_OPT_SIZE,
            .type = QEMU_OPT_SIZE,
            .help = "Virtual disk size"
        },
        {
            .name = BLOCK_OPT_PREALLOC,
            .type = QEMU_OPT_STRING,
            .help = "Preallocation mode (allowed values: off, full)"
        },
        { /* end of list */ }
    }
};

static BlockDriver bdrv_gluster = {
    .format_name                  = "gluster",
    .protocol_name                = "gluster",
    .instance_size                = sizeof(BDRVGlusterState),
    .bdrv_needs_filename          = true,
    .bdrv_file_open               = qemu_gluster_open,
    .bdrv_reopen_prepare          = qemu_gluster_reopen_prepare,
    .bdrv_reopen_commit           = qemu_gluster_reopen_commit,
    .bdrv_reopen_abort            = qemu_gluster_reopen_abort,
    .bdrv_close                   = qemu_gluster_close,
    .bdrv_create                  = qemu_gluster_create,
    .bdrv_getlength               = qemu_gluster_getlength,
    .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
    .bdrv_truncate                = qemu_gluster_truncate,
    .bdrv_co_readv                = qemu_gluster_co_readv,
    .bdrv_co_writev               = qemu_gluster_co_writev,
    .bdrv_co_flush_to_disk        = qemu_gluster_co_flush_to_disk,
    .bdrv_has_zero_init           = qemu_gluster_has_zero_init,
#ifdef CONFIG_GLUSTERFS_DISCARD
    .bdrv_co_discard              = qemu_gluster_co_discard,
#endif
#ifdef CONFIG_GLUSTERFS_ZEROFILL
    .bdrv_co_write_zeroes         = qemu_gluster_co_write_zeroes,
#endif
    .create_opts                  = &qemu_gluster_create_opts,
};

static BlockDriver bdrv_gluster_tcp = {
    .format_name                  = "gluster",
    .protocol_name                = "gluster+tcp",
    .instance_size                = sizeof(BDRVGlusterState),
    .bdrv_needs_filename          = true,
    .bdrv_file_open               = qemu_gluster_open,
    .bdrv_reopen_prepare          = qemu_gluster_reopen_prepare,
    .bdrv_reopen_commit           = qemu_gluster_reopen_commit,
    .bdrv_reopen_abort            = qemu_gluster_reopen_abort,
    .bdrv_close                   = qemu_gluster_close,
    .bdrv_create                  = qemu_gluster_create,
    .bdrv_getlength               = qemu_gluster_getlength,
    .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
    .bdrv_truncate                = qemu_gluster_truncate,
    .bdrv_co_readv                = qemu_gluster_co_readv,
    .bdrv_co_writev               = qemu_gluster_co_writev,
    .bdrv_co_flush_to_disk        = qemu_gluster_co_flush_to_disk,
    .bdrv_has_zero_init           = qemu_gluster_has_zero_init,
#ifdef CONFIG_GLUSTERFS_DISCARD
    .bdrv_co_discard              = qemu_gluster_co_discard,
#endif
#ifdef CONFIG_GLUSTERFS_ZEROFILL
    .bdrv_co_write_zeroes         = qemu_gluster_co_write_zeroes,
#endif
    .create_opts                  = &qemu_gluster_create_opts,
};

static BlockDriver bdrv_gluster_unix = {
    .format_name                  = "gluster",
    .protocol_name                = "gluster+unix",
    .instance_size                = sizeof(BDRVGlusterState),
    .bdrv_needs_filename          = true,
    .bdrv_file_open               = qemu_gluster_open,
    .bdrv_reopen_prepare          = qemu_gluster_reopen_prepare,
    .bdrv_reopen_commit           = qemu_gluster_reopen_commit,
    .bdrv_reopen_abort            = qemu_gluster_reopen_abort,
    .bdrv_close                   = qemu_gluster_close,
    .bdrv_create                  = qemu_gluster_create,
    .bdrv_getlength               = qemu_gluster_getlength,
    .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
    .bdrv_truncate                = qemu_gluster_truncate,
    .bdrv_co_readv                = qemu_gluster_co_readv,
    .bdrv_co_writev               = qemu_gluster_co_writev,
    .bdrv_co_flush_to_disk        = qemu_gluster_co_flush_to_disk,
    .bdrv_has_zero_init           = qemu_gluster_has_zero_init,
#ifdef CONFIG_GLUSTERFS_DISCARD
    .bdrv_co_discard              = qemu_gluster_co_discard,
#endif
#ifdef CONFIG_GLUSTERFS_ZEROFILL
    .bdrv_co_write_zeroes         = qemu_gluster_co_write_zeroes,
#endif
    .create_opts                  = &qemu_gluster_create_opts,
};

static BlockDriver bdrv_gluster_rdma = {
    .format_name                  = "gluster",
    .protocol_name                = "gluster+rdma",
    .instance_size                = sizeof(BDRVGlusterState),
    .bdrv_needs_filename          = true,
    .bdrv_file_open               = qemu_gluster_open,
    .bdrv_reopen_prepare          = qemu_gluster_reopen_prepare,
    .bdrv_reopen_commit           = qemu_gluster_reopen_commit,
    .bdrv_reopen_abort            = qemu_gluster_reopen_abort,
    .bdrv_close                   = qemu_gluster_close,
    .bdrv_create                  = qemu_gluster_create,
    .bdrv_getlength               = qemu_gluster_getlength,
    .bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
    .bdrv_truncate                = qemu_gluster_truncate,
    .bdrv_co_readv                = qemu_gluster_co_readv,
    .bdrv_co_writev               = qemu_gluster_co_writev,
    .bdrv_co_flush_to_disk        = qemu_gluster_co_flush_to_disk,
    .bdrv_has_zero_init           = qemu_gluster_has_zero_init,
#ifdef CONFIG_GLUSTERFS_DISCARD
    .bdrv_co_discard              = qemu_gluster_co_discard,
#endif
#ifdef CONFIG_GLUSTERFS_ZEROFILL
    .bdrv_co_write_zeroes         = qemu_gluster_co_write_zeroes,
#endif
    .create_opts                  = &qemu_gluster_create_opts,
};

static void bdrv_gluster_init(void)
{
    bdrv_register(&bdrv_gluster_rdma);
    bdrv_register(&bdrv_gluster_unix);
    bdrv_register(&bdrv_gluster_tcp);
    bdrv_register(&bdrv_gluster);
}

block_init(bdrv_gluster_init);