-
Notifications
You must be signed in to change notification settings - Fork 5.3k
/
gluster.c
1668 lines (1462 loc) · 50.9 KB
/
gluster.c
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
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* 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 "qemu/osdep.h"
#include "qemu/units.h"
#include <glusterfs/api/glfs.h>
#include "block/block_int.h"
#include "block/qdict.h"
#include "qapi/error.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qerror.h"
#include "qemu/uri.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "qemu/option.h"
#include "qemu/cutils.h"
#ifdef CONFIG_GLUSTERFS_FTRUNCATE_HAS_STAT
# define glfs_ftruncate(fd, offset) glfs_ftruncate(fd, offset, NULL, NULL)
#endif
#define GLUSTER_OPT_FILENAME "filename"
#define GLUSTER_OPT_VOLUME "volume"
#define GLUSTER_OPT_PATH "path"
#define GLUSTER_OPT_TYPE "type"
#define GLUSTER_OPT_SERVER_PATTERN "server."
#define GLUSTER_OPT_HOST "host"
#define GLUSTER_OPT_PORT "port"
#define GLUSTER_OPT_TO "to"
#define GLUSTER_OPT_IPV4 "ipv4"
#define GLUSTER_OPT_IPV6 "ipv6"
#define GLUSTER_OPT_SOCKET "socket"
#define GLUSTER_OPT_DEBUG "debug"
#define GLUSTER_DEFAULT_PORT 24007
#define GLUSTER_DEBUG_DEFAULT 4
#define GLUSTER_DEBUG_MAX 9
#define GLUSTER_OPT_LOGFILE "logfile"
#define GLUSTER_LOGFILE_DEFAULT "-" /* handled in libgfapi as /dev/stderr */
/*
* Several versions of GlusterFS (3.12? -> 6.0.1) fail when the transfer size
* is greater or equal to 1024 MiB, so we are limiting the transfer size to 512
* MiB to avoid this rare issue.
*/
#define GLUSTER_MAX_TRANSFER (512 * MiB)
#define GERR_INDEX_HINT "hint: check in 'server' array index '%d'\n"
typedef struct GlusterAIOCB {
int64_t size;
int ret;
Coroutine *coroutine;
AioContext *aio_context;
} GlusterAIOCB;
typedef struct BDRVGlusterState {
struct glfs *glfs;
struct glfs_fd *fd;
char *logfile;
bool supports_seek_data;
int debug;
} BDRVGlusterState;
typedef struct BDRVGlusterReopenState {
struct glfs *glfs;
struct glfs_fd *fd;
} BDRVGlusterReopenState;
typedef struct GlfsPreopened {
char *volume;
glfs_t *fs;
int ref;
} GlfsPreopened;
typedef struct ListElement {
QLIST_ENTRY(ListElement) list;
GlfsPreopened saved;
} ListElement;
static QLIST_HEAD(, ListElement) glfs_list;
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"
#ifdef CONFIG_GLUSTERFS_FALLOCATE
", falloc"
#endif
#ifdef CONFIG_GLUSTERFS_ZEROFILL
", full"
#endif
")"
},
{
.name = GLUSTER_OPT_DEBUG,
.type = QEMU_OPT_NUMBER,
.help = "Gluster log level, valid range is 0-9",
},
{
.name = GLUSTER_OPT_LOGFILE,
.type = QEMU_OPT_STRING,
.help = "Logfile path of libgfapi",
},
{ /* end of list */ }
}
};
static QemuOptsList runtime_opts = {
.name = "gluster",
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
.desc = {
{
.name = GLUSTER_OPT_FILENAME,
.type = QEMU_OPT_STRING,
.help = "URL to the gluster image",
},
{
.name = GLUSTER_OPT_DEBUG,
.type = QEMU_OPT_NUMBER,
.help = "Gluster log level, valid range is 0-9",
},
{
.name = GLUSTER_OPT_LOGFILE,
.type = QEMU_OPT_STRING,
.help = "Logfile path of libgfapi",
},
{ /* end of list */ }
},
};
static QemuOptsList runtime_json_opts = {
.name = "gluster_json",
.head = QTAILQ_HEAD_INITIALIZER(runtime_json_opts.head),
.desc = {
{
.name = GLUSTER_OPT_VOLUME,
.type = QEMU_OPT_STRING,
.help = "name of gluster volume where VM image resides",
},
{
.name = GLUSTER_OPT_PATH,
.type = QEMU_OPT_STRING,
.help = "absolute path to image file in gluster volume",
},
{
.name = GLUSTER_OPT_DEBUG,
.type = QEMU_OPT_NUMBER,
.help = "Gluster log level, valid range is 0-9",
},
{ /* end of list */ }
},
};
static QemuOptsList runtime_type_opts = {
.name = "gluster_type",
.head = QTAILQ_HEAD_INITIALIZER(runtime_type_opts.head),
.desc = {
{
.name = GLUSTER_OPT_TYPE,
.type = QEMU_OPT_STRING,
.help = "inet|unix",
},
{ /* end of list */ }
},
};
static QemuOptsList runtime_unix_opts = {
.name = "gluster_unix",
.head = QTAILQ_HEAD_INITIALIZER(runtime_unix_opts.head),
.desc = {
{
.name = GLUSTER_OPT_SOCKET,
.type = QEMU_OPT_STRING,
.help = "socket file path (legacy)",
},
{
.name = GLUSTER_OPT_PATH,
.type = QEMU_OPT_STRING,
.help = "socket file path (QAPI)",
},
{ /* end of list */ }
},
};
static QemuOptsList runtime_inet_opts = {
.name = "gluster_inet",
.head = QTAILQ_HEAD_INITIALIZER(runtime_inet_opts.head),
.desc = {
{
.name = GLUSTER_OPT_TYPE,
.type = QEMU_OPT_STRING,
.help = "inet|unix",
},
{
.name = GLUSTER_OPT_HOST,
.type = QEMU_OPT_STRING,
.help = "host address (hostname/ipv4/ipv6 addresses)",
},
{
.name = GLUSTER_OPT_PORT,
.type = QEMU_OPT_STRING,
.help = "port number on which glusterd is listening (default 24007)",
},
{
.name = "to",
.type = QEMU_OPT_NUMBER,
.help = "max port number, not supported by gluster",
},
{
.name = "ipv4",
.type = QEMU_OPT_BOOL,
.help = "ipv4 bool value, not supported by gluster",
},
{
.name = "ipv6",
.type = QEMU_OPT_BOOL,
.help = "ipv6 bool value, not supported by gluster",
},
{ /* end of list */ }
},
};
static void glfs_set_preopened(const char *volume, glfs_t *fs)
{
ListElement *entry = NULL;
entry = g_new(ListElement, 1);
entry->saved.volume = g_strdup(volume);
entry->saved.fs = fs;
entry->saved.ref = 1;
QLIST_INSERT_HEAD(&glfs_list, entry, list);
}
static glfs_t *glfs_find_preopened(const char *volume)
{
ListElement *entry = NULL;
QLIST_FOREACH(entry, &glfs_list, list) {
if (strcmp(entry->saved.volume, volume) == 0) {
entry->saved.ref++;
return entry->saved.fs;
}
}
return NULL;
}
static void glfs_clear_preopened(glfs_t *fs)
{
ListElement *entry = NULL;
ListElement *next;
if (fs == NULL) {
return;
}
QLIST_FOREACH_SAFE(entry, &glfs_list, list, next) {
if (entry->saved.fs == fs) {
if (--entry->saved.ref) {
return;
}
QLIST_REMOVE(entry, list);
glfs_fini(entry->saved.fs);
g_free(entry->saved.volume);
g_free(entry);
}
}
}
static int parse_volume_options(BlockdevOptionsGluster *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->volume = g_strndup(q, p - q);
/* path */
p += strspn(p, "/");
if (*p == '\0') {
return -EINVAL;
}
gconf->path = g_strdup(p);
return 0;
}
/*
* file=gluster[+transport]://[host[:port]]/volume/path[?socket=...]
*
* 'gluster' is the protocol.
*
* 'transport' specifies the transport type used to connect to gluster
* management daemon (glusterd). Valid transport types are
* tcp or unix. If a transport type isn't specified, then tcp type is assumed.
*
* 'host' specifies the host where the volume file specification for
* the given volume resides. This can be either hostname or ipv4 address.
* If transport type is 'unix', then 'host' 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.
*
* 'volume' is the name of the gluster volume which contains the VM image.
*
* 'path' 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://host.domain.com:24007/testvol/dir/a.img
* file=gluster+unix:///testvol/dir/a.img?socket=/tmp/glusterd.socket
*/
static int qemu_gluster_parse_uri(BlockdevOptionsGluster *gconf,
const char *filename)
{
SocketAddress *gsconf;
URI *uri;
QueryParams *qp = NULL;
bool is_unix = false;
int ret = 0;
uri = uri_parse(filename);
if (!uri) {
return -EINVAL;
}
gsconf = g_new0(SocketAddress, 1);
QAPI_LIST_PREPEND(gconf->server, gsconf);
/* transport */
if (!uri->scheme || !strcmp(uri->scheme, "gluster")) {
gsconf->type = SOCKET_ADDRESS_TYPE_INET;
} else if (!strcmp(uri->scheme, "gluster+tcp")) {
gsconf->type = SOCKET_ADDRESS_TYPE_INET;
} else if (!strcmp(uri->scheme, "gluster+unix")) {
gsconf->type = SOCKET_ADDRESS_TYPE_UNIX;
is_unix = true;
} else if (!strcmp(uri->scheme, "gluster+rdma")) {
gsconf->type = SOCKET_ADDRESS_TYPE_INET;
warn_report("rdma feature is not supported, falling back to tcp");
} 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;
}
gsconf->u.q_unix.path = g_strdup(qp->p[0].value);
} else {
gsconf->u.inet.host = g_strdup(uri->server ? uri->server : "localhost");
if (uri->port) {
gsconf->u.inet.port = g_strdup_printf("%d", uri->port);
} else {
gsconf->u.inet.port = g_strdup_printf("%d", GLUSTER_DEFAULT_PORT);
}
}
out:
if (qp) {
query_params_free(qp);
}
uri_free(uri);
return ret;
}
static struct glfs *qemu_gluster_glfs_init(BlockdevOptionsGluster *gconf,
Error **errp)
{
struct glfs *glfs;
int ret;
int old_errno;
SocketAddressList *server;
unsigned long long port;
glfs = glfs_find_preopened(gconf->volume);
if (glfs) {
return glfs;
}
glfs = glfs_new(gconf->volume);
if (!glfs) {
goto out;
}
glfs_set_preopened(gconf->volume, glfs);
for (server = gconf->server; server; server = server->next) {
switch (server->value->type) {
case SOCKET_ADDRESS_TYPE_UNIX:
ret = glfs_set_volfile_server(glfs, "unix",
server->value->u.q_unix.path, 0);
break;
case SOCKET_ADDRESS_TYPE_INET:
if (parse_uint_full(server->value->u.inet.port, &port, 10) < 0 ||
port > 65535) {
error_setg(errp, "'%s' is not a valid port number",
server->value->u.inet.port);
errno = EINVAL;
goto out;
}
ret = glfs_set_volfile_server(glfs, "tcp",
server->value->u.inet.host,
(int)port);
break;
case SOCKET_ADDRESS_TYPE_VSOCK:
case SOCKET_ADDRESS_TYPE_FD:
default:
abort();
}
if (ret < 0) {
goto out;
}
}
ret = glfs_set_logging(glfs, gconf->logfile, gconf->debug);
if (ret < 0) {
goto out;
}
ret = glfs_init(glfs);
if (ret) {
error_setg(errp, "Gluster connection for volume %s, path %s failed"
" to connect", gconf->volume, gconf->path);
for (server = gconf->server; server; server = server->next) {
if (server->value->type == SOCKET_ADDRESS_TYPE_UNIX) {
error_append_hint(errp, "hint: failed on socket %s ",
server->value->u.q_unix.path);
} else {
error_append_hint(errp, "hint: failed on host %s and port %s ",
server->value->u.inet.host,
server->value->u.inet.port);
}
}
error_append_hint(errp, "Please refer to gluster logs for more info\n");
/* 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_clear_preopened(glfs);
errno = old_errno;
}
return NULL;
}
/*
* Convert the json formatted command line into qapi.
*/
static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf,
QDict *options, Error **errp)
{
QemuOpts *opts;
SocketAddress *gsconf = NULL;
SocketAddressList **tail;
QDict *backing_options = NULL;
Error *local_err = NULL;
char *str = NULL;
const char *ptr;
int i, type, num_servers;
/* create opts info from runtime_json_opts list */
opts = qemu_opts_create(&runtime_json_opts, NULL, 0, &error_abort);
if (!qemu_opts_absorb_qdict(opts, options, errp)) {
goto out;
}
num_servers = qdict_array_entries(options, GLUSTER_OPT_SERVER_PATTERN);
if (num_servers < 1) {
error_setg(&local_err, QERR_MISSING_PARAMETER, "server");
goto out;
}
ptr = qemu_opt_get(opts, GLUSTER_OPT_VOLUME);
if (!ptr) {
error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_VOLUME);
goto out;
}
gconf->volume = g_strdup(ptr);
ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH);
if (!ptr) {
error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_PATH);
goto out;
}
gconf->path = g_strdup(ptr);
qemu_opts_del(opts);
tail = &gconf->server;
for (i = 0; i < num_servers; i++) {
str = g_strdup_printf(GLUSTER_OPT_SERVER_PATTERN"%d.", i);
qdict_extract_subqdict(options, &backing_options, str);
/* create opts info from runtime_type_opts list */
opts = qemu_opts_create(&runtime_type_opts, NULL, 0, &error_abort);
if (!qemu_opts_absorb_qdict(opts, backing_options, errp)) {
goto out;
}
ptr = qemu_opt_get(opts, GLUSTER_OPT_TYPE);
if (!ptr) {
error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_TYPE);
error_append_hint(&local_err, GERR_INDEX_HINT, i);
goto out;
}
gsconf = g_new0(SocketAddress, 1);
if (!strcmp(ptr, "tcp")) {
ptr = "inet"; /* accept legacy "tcp" */
}
type = qapi_enum_parse(&SocketAddressType_lookup, ptr, -1, NULL);
if (type != SOCKET_ADDRESS_TYPE_INET
&& type != SOCKET_ADDRESS_TYPE_UNIX) {
error_setg(&local_err,
"Parameter '%s' may be 'inet' or 'unix'",
GLUSTER_OPT_TYPE);
error_append_hint(&local_err, GERR_INDEX_HINT, i);
goto out;
}
gsconf->type = type;
qemu_opts_del(opts);
if (gsconf->type == SOCKET_ADDRESS_TYPE_INET) {
/* create opts info from runtime_inet_opts list */
opts = qemu_opts_create(&runtime_inet_opts, NULL, 0, &error_abort);
if (!qemu_opts_absorb_qdict(opts, backing_options, errp)) {
goto out;
}
ptr = qemu_opt_get(opts, GLUSTER_OPT_HOST);
if (!ptr) {
error_setg(&local_err, QERR_MISSING_PARAMETER,
GLUSTER_OPT_HOST);
error_append_hint(&local_err, GERR_INDEX_HINT, i);
goto out;
}
gsconf->u.inet.host = g_strdup(ptr);
ptr = qemu_opt_get(opts, GLUSTER_OPT_PORT);
if (!ptr) {
error_setg(&local_err, QERR_MISSING_PARAMETER,
GLUSTER_OPT_PORT);
error_append_hint(&local_err, GERR_INDEX_HINT, i);
goto out;
}
gsconf->u.inet.port = g_strdup(ptr);
/* defend for unsupported fields in InetSocketAddress,
* i.e. @ipv4, @ipv6 and @to
*/
ptr = qemu_opt_get(opts, GLUSTER_OPT_TO);
if (ptr) {
gsconf->u.inet.has_to = true;
}
ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV4);
if (ptr) {
gsconf->u.inet.has_ipv4 = true;
}
ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV6);
if (ptr) {
gsconf->u.inet.has_ipv6 = true;
}
if (gsconf->u.inet.has_to) {
error_setg(&local_err, "Parameter 'to' not supported");
goto out;
}
if (gsconf->u.inet.has_ipv4 || gsconf->u.inet.has_ipv6) {
error_setg(&local_err, "Parameters 'ipv4/ipv6' not supported");
goto out;
}
qemu_opts_del(opts);
} else {
/* create opts info from runtime_unix_opts list */
opts = qemu_opts_create(&runtime_unix_opts, NULL, 0, &error_abort);
if (!qemu_opts_absorb_qdict(opts, backing_options, errp)) {
goto out;
}
ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH);
if (!ptr) {
ptr = qemu_opt_get(opts, GLUSTER_OPT_SOCKET);
} else if (qemu_opt_get(opts, GLUSTER_OPT_SOCKET)) {
error_setg(&local_err,
"Conflicting parameters 'path' and 'socket'");
error_append_hint(&local_err, GERR_INDEX_HINT, i);
goto out;
}
if (!ptr) {
error_setg(&local_err, QERR_MISSING_PARAMETER,
GLUSTER_OPT_PATH);
error_append_hint(&local_err, GERR_INDEX_HINT, i);
goto out;
}
gsconf->u.q_unix.path = g_strdup(ptr);
qemu_opts_del(opts);
}
QAPI_LIST_APPEND(tail, gsconf);
gsconf = NULL;
qobject_unref(backing_options);
backing_options = NULL;
g_free(str);
str = NULL;
}
return 0;
out:
error_propagate(errp, local_err);
qapi_free_SocketAddress(gsconf);
qemu_opts_del(opts);
g_free(str);
qobject_unref(backing_options);
errno = EINVAL;
return -errno;
}
/* Converts options given in @filename and the @options QDict into the QAPI
* object @gconf. */
static int qemu_gluster_parse(BlockdevOptionsGluster *gconf,
const char *filename,
QDict *options, Error **errp)
{
int ret;
if (filename) {
ret = qemu_gluster_parse_uri(gconf, filename);
if (ret < 0) {
error_setg(errp, "invalid URI %s", filename);
error_append_hint(errp, "Usage: file=gluster[+transport]://"
"[host[:port]]volume/path[?socket=...]"
"[,file.debug=N]"
"[,file.logfile=/path/filename.log]\n");
return ret;
}
} else {
ret = qemu_gluster_parse_json(gconf, options, errp);
if (ret < 0) {
error_append_hint(errp, "Usage: "
"-drive driver=qcow2,file.driver=gluster,"
"file.volume=testvol,file.path=/path/a.qcow2"
"[,file.debug=9]"
"[,file.logfile=/path/filename.log],"
"file.server.0.type=inet,"
"file.server.0.host=1.2.3.4,"
"file.server.0.port=24007,"
"file.server.1.transport=unix,"
"file.server.1.path=/var/run/glusterd.socket ..."
"\n");
return ret;
}
}
return 0;
}
static struct glfs *qemu_gluster_init(BlockdevOptionsGluster *gconf,
const char *filename,
QDict *options, Error **errp)
{
int ret;
ret = qemu_gluster_parse(gconf, filename, options, errp);
if (ret < 0) {
errno = -ret;
return NULL;
}
return qemu_gluster_glfs_init(gconf, errp);
}
/*
* AIO callback routine called from GlusterFS thread.
*/
static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret,
#ifdef CONFIG_GLUSTERFS_IOCB_HAS_STAT
struct glfs_stat *pre, struct glfs_stat *post,
#endif
void *arg)
{
GlusterAIOCB *acb = (GlusterAIOCB *)arg;
if (!ret || ret == acb->size) {
acb->ret = 0; /* Success */
} else if (ret < 0) {
acb->ret = -errno; /* Read/Write failed */
} else {
acb->ret = -EIO; /* Partial read/write - fail it */
}
aio_co_schedule(acb->aio_context, acb->coroutine);
}
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;
}
}
/*
* Do SEEK_DATA/HOLE to detect if it is functional. Older broken versions of
* gfapi incorrectly return the current offset when SEEK_DATA/HOLE is used.
* - Corrected versions return -1 and set errno to EINVAL.
* - Versions that support SEEK_DATA/HOLE correctly, will return -1 and set
* errno to ENXIO when SEEK_DATA is called with a position of EOF.
*/
static bool qemu_gluster_test_seek(struct glfs_fd *fd)
{
off_t ret = 0;
#if defined SEEK_HOLE && defined SEEK_DATA
off_t eof;
eof = glfs_lseek(fd, 0, SEEK_END);
if (eof < 0) {
/* this should never occur */
return false;
}
/* this should always fail with ENXIO if SEEK_DATA is supported */
ret = glfs_lseek(fd, eof, SEEK_DATA);
#endif
return (ret < 0) && (errno == ENXIO);
}
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;
BlockdevOptionsGluster *gconf = NULL;
QemuOpts *opts;
const char *filename, *logfile;
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
if (!qemu_opts_absorb_qdict(opts, options, errp)) {
ret = -EINVAL;
goto out;
}
filename = qemu_opt_get(opts, GLUSTER_OPT_FILENAME);
s->debug = qemu_opt_get_number(opts, GLUSTER_OPT_DEBUG,
GLUSTER_DEBUG_DEFAULT);
if (s->debug < 0) {
s->debug = 0;
} else if (s->debug > GLUSTER_DEBUG_MAX) {
s->debug = GLUSTER_DEBUG_MAX;
}
gconf = g_new0(BlockdevOptionsGluster, 1);
gconf->debug = s->debug;
gconf->has_debug = true;
logfile = qemu_opt_get(opts, GLUSTER_OPT_LOGFILE);
s->logfile = g_strdup(logfile ? logfile : GLUSTER_LOGFILE_DEFAULT);
gconf->logfile = g_strdup(s->logfile);
gconf->has_logfile = true;
s->glfs = qemu_gluster_init(gconf, filename, options, errp);
if (!s->glfs) {
ret = -errno;
goto out;
}
#ifdef CONFIG_GLUSTERFS_XLATOR_OPT
/* Without this, if fsync fails for a recoverable reason (for instance,
* ENOSPC), gluster will dump its cache, preventing retries. This means
* almost certain data loss. Not all gluster versions support the
* 'resync-failed-syncs-after-fsync' key value, but there is no way to
* discover during runtime if it is supported (this api returns success for
* unknown key/value pairs) */
ret = glfs_set_xlator_option(s->glfs, "*-write-behind",
"resync-failed-syncs-after-fsync",
"on");
if (ret < 0) {
error_setg_errno(errp, errno, "Unable to set xlator key/value pair");
ret = -errno;
goto out;
}
#endif
qemu_gluster_parse_flags(bdrv_flags, &open_flags);
s->fd = glfs_open(s->glfs, gconf->path, open_flags);
ret = s->fd ? 0 : -errno;
if (ret == -EACCES || ret == -EROFS) {
/* Try to degrade to read-only, but if it doesn't work, still use the
* normal error message. */
if (bdrv_apply_auto_read_only(bs, NULL, NULL) == 0) {
open_flags = (open_flags & ~O_RDWR) | O_RDONLY;
s->fd = glfs_open(s->glfs, gconf->path, open_flags);
ret = s->fd ? 0 : -errno;
}
}
s->supports_seek_data = qemu_gluster_test_seek(s->fd);
out:
qemu_opts_del(opts);
qapi_free_BlockdevOptionsGluster(gconf);
if (!ret) {
return ret;
}
g_free(s->logfile);
if (s->fd) {
glfs_close(s->fd);
}
glfs_clear_preopened(s->glfs);
return ret;
}
static void qemu_gluster_refresh_limits(BlockDriverState *bs, Error **errp)
{
bs->bl.max_transfer = GLUSTER_MAX_TRANSFER;
}
static int qemu_gluster_reopen_prepare(BDRVReopenState *state,
BlockReopenQueue *queue, Error **errp)
{
int ret = 0;
BDRVGlusterState *s;
BDRVGlusterReopenState *reop_s;
BlockdevOptionsGluster *gconf;
int open_flags = 0;
assert(state != NULL);
assert(state->bs != NULL);
s = state->bs->opaque;
state->opaque = g_new0(BDRVGlusterReopenState, 1);
reop_s = state->opaque;
qemu_gluster_parse_flags(state->flags, &open_flags);
gconf = g_new0(BlockdevOptionsGluster, 1);
gconf->debug = s->debug;
gconf->has_debug = true;
gconf->logfile = g_strdup(s->logfile);
gconf->has_logfile = true;
/*
* If 'state->bs->exact_filename' is empty, 'state->options' should contain
* the JSON parameters already parsed.
*/
if (state->bs->exact_filename[0] != '\0') {
reop_s->glfs = qemu_gluster_init(gconf, state->bs->exact_filename, NULL,
errp);
} else {
reop_s->glfs = qemu_gluster_init(gconf, NULL, state->options, errp);
}
if (reop_s->glfs == NULL) {
ret = -errno;
goto exit;
}
#ifdef CONFIG_GLUSTERFS_XLATOR_OPT
ret = glfs_set_xlator_option(reop_s->glfs, "*-write-behind",
"resync-failed-syncs-after-fsync", "on");
if (ret < 0) {
error_setg_errno(errp, errno, "Unable to set xlator key/value pair");
ret = -errno;
goto exit;
}
#endif
reop_s->fd = glfs_open(reop_s->glfs, gconf->path, 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 */
qapi_free_BlockdevOptionsGluster(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);
}
glfs_clear_preopened(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);
}
glfs_clear_preopened(reop_s->glfs);
g_free(state->opaque);
state->opaque = NULL;
return;