2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; under version 2 of the License.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 #include "qemu/osdep.h"
24 #include "qapi/error.h"
25 #include "qemu/cutils.h"
26 #include "sysemu/block-backend.h"
27 #include "block/block_int.h"
28 #include "block/nbd.h"
29 #include "qemu/main-loop.h"
30 #include "qemu/module.h"
31 #include "qemu/option.h"
32 #include "qemu/error-report.h"
33 #include "qemu/config-file.h"
34 #include "qemu/bswap.h"
36 #include "qemu/systemd.h"
37 #include "block/snapshot.h"
38 #include "qapi/qmp/qdict.h"
39 #include "qapi/qmp/qstring.h"
40 #include "qom/object_interfaces.h"
41 #include "io/channel-socket.h"
42 #include "io/net-listener.h"
43 #include "crypto/init.h"
44 #include "trace/control.h"
45 #include "qemu-version.h"
48 #define HAVE_NBD_DEVICE 1
50 #define HAVE_NBD_DEVICE 0
53 #define SOCKET_PATH "/var/lock/qemu-nbd-%s"
54 #define QEMU_NBD_OPT_CACHE 256
55 #define QEMU_NBD_OPT_AIO 257
56 #define QEMU_NBD_OPT_DISCARD 258
57 #define QEMU_NBD_OPT_DETECT_ZEROES 259
58 #define QEMU_NBD_OPT_OBJECT 260
59 #define QEMU_NBD_OPT_TLSCREDS 261
60 #define QEMU_NBD_OPT_IMAGE_OPTS 262
61 #define QEMU_NBD_OPT_FORK 263
62 #define QEMU_NBD_OPT_TLSAUTHZ 264
66 static NBDExport
*export
;
69 static SocketAddress
*saddr
;
70 static int persistent
= 0;
71 static enum { RUNNING
, TERMINATE
, TERMINATING
, TERMINATED
} state
;
72 static int shared
= 1;
74 static QIONetListener
*server
;
75 static QCryptoTLSCreds
*tlscreds
;
76 static const char *tlsauthz
;
78 static void usage(const char *name
)
81 "Usage: %s [OPTIONS] FILE\n"
82 " or: %s -L [OPTIONS]\n"
83 "QEMU Disk Network Block Device Utility\n"
85 " -h, --help display this help and exit\n"
86 " -V, --version output version information and exit\n"
88 "Connection properties:\n"
89 " -p, --port=PORT port to listen on (default `%d')\n"
90 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
91 " -k, --socket=PATH path to the unix socket\n"
92 " (default '"SOCKET_PATH
"')\n"
93 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
94 " -t, --persistent don't exit on the last connection\n"
95 " -v, --verbose display extra debugging information\n"
96 " -x, --export-name=NAME expose export by name (default is empty string)\n"
97 " -D, --description=TEXT export a human-readable description\n"
99 "Exposing part of the image:\n"
100 " -o, --offset=OFFSET offset into the image\n"
101 " -P, --partition=NUM only expose partition NUM\n"
102 " -B, --bitmap=NAME expose a persistent dirty bitmap\n"
104 "General purpose options:\n"
105 " -L, --list list exports available from another NBD server\n"
106 " --object type,id=ID,... define an object such as 'secret' for providing\n"
107 " passwords and/or encryption keys\n"
108 " --tls-creds=ID use id of an earlier --object to provide TLS\n"
109 " --tls-authz=ID use id of an earlier --object to provide\n"
111 " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
112 " specify tracing options\n"
113 " --fork fork off the server process and exit the parent\n"
114 " once the server is running\n"
117 "Kernel NBD client support:\n"
118 " -c, --connect=DEV connect FILE to the local NBD device DEV\n"
119 " -d, --disconnect disconnect the specified device\n"
122 "Block device options:\n"
123 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
124 " -r, --read-only export read-only\n"
125 " -s, --snapshot use FILE as an external snapshot, create a temporary\n"
126 " file with backing_file=FILE, redirect the write to\n"
127 " the temporary one\n"
128 " -l, --load-snapshot=SNAPSHOT_PARAM\n"
129 " load an internal snapshot inside FILE and export it\n"
130 " as an read-only device, SNAPSHOT_PARAM format is\n"
131 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
133 " -n, --nocache disable host cache\n"
134 " --cache=MODE set cache mode (none, writeback, ...)\n"
135 " --aio=MODE set AIO mode (native or threads)\n"
136 " --discard=MODE set discard mode (ignore, unmap)\n"
137 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
138 " --image-opts treat FILE as a full set of image options\n"
140 QEMU_HELP_BOTTOM
"\n"
141 , name
, name
, NBD_DEFAULT_PORT
, "DEVICE");
144 static void version(const char *name
)
147 "%s " QEMU_FULL_VERSION
"\n"
148 "Written by Anthony Liguori.\n"
151 "This is free software; see the source for copying conditions. There is NO\n"
152 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
156 struct partition_record
160 uint32_t start_cylinder
;
161 uint8_t start_sector
;
164 uint8_t end_cylinder
;
166 uint32_t start_sector_abs
;
167 uint32_t nb_sectors_abs
;
170 static void read_partition(uint8_t *p
, struct partition_record
*r
)
173 r
->start_head
= p
[1];
174 r
->start_cylinder
= p
[3] | ((p
[2] << 2) & 0x0300);
175 r
->start_sector
= p
[2] & 0x3f;
178 r
->end_cylinder
= p
[7] | ((p
[6] << 2) & 0x300);
179 r
->end_sector
= p
[6] & 0x3f;
181 r
->start_sector_abs
= ldl_le_p(p
+ 8);
182 r
->nb_sectors_abs
= ldl_le_p(p
+ 12);
185 static int find_partition(BlockBackend
*blk
, int partition
,
186 uint64_t *offset
, uint64_t *size
)
188 struct partition_record mbr
[4];
189 uint8_t data
[MBR_SIZE
];
194 ret
= blk_pread(blk
, 0, data
, sizeof(data
));
196 error_report("error while reading: %s", strerror(-ret
));
200 if (data
[510] != 0x55 || data
[511] != 0xaa) {
204 for (i
= 0; i
< 4; i
++) {
205 read_partition(&data
[446 + 16 * i
], &mbr
[i
]);
207 if (!mbr
[i
].system
|| !mbr
[i
].nb_sectors_abs
) {
211 if (mbr
[i
].system
== 0xF || mbr
[i
].system
== 0x5) {
212 struct partition_record ext
[4];
213 uint8_t data1
[MBR_SIZE
];
216 ret
= blk_pread(blk
, mbr
[i
].start_sector_abs
* MBR_SIZE
,
217 data1
, sizeof(data1
));
219 error_report("error while reading: %s", strerror(-ret
));
223 for (j
= 0; j
< 4; j
++) {
224 read_partition(&data1
[446 + 16 * j
], &ext
[j
]);
225 if (!ext
[j
].system
|| !ext
[j
].nb_sectors_abs
) {
229 if ((ext_partnum
+ j
+ 1) == partition
) {
230 *offset
= (uint64_t)ext
[j
].start_sector_abs
<< 9;
231 *size
= (uint64_t)ext
[j
].nb_sectors_abs
<< 9;
236 } else if ((i
+ 1) == partition
) {
237 *offset
= (uint64_t)mbr
[i
].start_sector_abs
<< 9;
238 *size
= (uint64_t)mbr
[i
].nb_sectors_abs
<< 9;
246 static void termsig_handler(int signum
)
248 atomic_cmpxchg(&state
, RUNNING
, TERMINATE
);
253 static int qemu_nbd_client_list(SocketAddress
*saddr
, QCryptoTLSCreds
*tls
,
254 const char *hostname
)
256 int ret
= EXIT_FAILURE
;
259 QIOChannelSocket
*sioc
;
263 sioc
= qio_channel_socket_new();
264 if (qio_channel_socket_connect_sync(sioc
, saddr
, &err
) < 0) {
265 error_report_err(err
);
268 rc
= nbd_receive_export_list(QIO_CHANNEL(sioc
), tls
, hostname
, &list
,
272 error_report_err(err
);
276 printf("exports available: %d\n", rc
);
277 for (i
= 0; i
< rc
; i
++) {
278 printf(" export: '%s'\n", list
[i
].name
);
279 if (list
[i
].description
&& *list
[i
].description
) {
280 printf(" description: %s\n", list
[i
].description
);
282 if (list
[i
].flags
& NBD_FLAG_HAS_FLAGS
) {
283 static const char *const flag_names
[] = {
284 [NBD_FLAG_READ_ONLY_BIT
] = "readonly",
285 [NBD_FLAG_SEND_FLUSH_BIT
] = "flush",
286 [NBD_FLAG_SEND_FUA_BIT
] = "fua",
287 [NBD_FLAG_ROTATIONAL_BIT
] = "rotational",
288 [NBD_FLAG_SEND_TRIM_BIT
] = "trim",
289 [NBD_FLAG_SEND_WRITE_ZEROES_BIT
] = "zeroes",
290 [NBD_FLAG_SEND_DF_BIT
] = "df",
291 [NBD_FLAG_CAN_MULTI_CONN_BIT
] = "multi",
292 [NBD_FLAG_SEND_RESIZE_BIT
] = "resize",
293 [NBD_FLAG_SEND_CACHE_BIT
] = "cache",
296 printf(" size: %" PRIu64
"\n", list
[i
].size
);
297 printf(" flags: 0x%x (", list
[i
].flags
);
298 for (size_t bit
= 0; bit
< ARRAY_SIZE(flag_names
); bit
++) {
299 if (flag_names
[bit
] && (list
[i
].flags
& (1 << bit
))) {
300 printf(" %s", flag_names
[bit
]);
305 if (list
[i
].min_block
) {
306 printf(" min block: %u\n", list
[i
].min_block
);
307 printf(" opt block: %u\n", list
[i
].opt_block
);
308 printf(" max block: %u\n", list
[i
].max_block
);
310 if (list
[i
].n_contexts
) {
311 printf(" available meta contexts: %d\n", list
[i
].n_contexts
);
312 for (j
= 0; j
< list
[i
].n_contexts
; j
++) {
313 printf(" %s\n", list
[i
].contexts
[j
]);
317 nbd_free_export_list(list
, rc
);
321 object_unref(OBJECT(sioc
));
327 static void *show_parts(void *arg
)
332 /* linux just needs an open() to trigger
333 * the partition table update
334 * but remember to load the module with max_part != 0 :
335 * modprobe nbd max_part=63
337 nbd
= open(device
, O_RDWR
);
344 static void *nbd_client_thread(void *arg
)
347 NBDExportInfo info
= { .request_sizes
= false, .name
= g_strdup("") };
348 QIOChannelSocket
*sioc
;
351 pthread_t show_parts_thread
;
352 Error
*local_error
= NULL
;
354 sioc
= qio_channel_socket_new();
355 if (qio_channel_socket_connect_sync(sioc
,
358 error_report_err(local_error
);
362 ret
= nbd_receive_negotiate(QIO_CHANNEL(sioc
),
363 NULL
, NULL
, NULL
, &info
, &local_error
);
366 error_report_err(local_error
);
371 fd
= open(device
, O_RDWR
);
373 /* Linux-only, we can use %m in printf. */
374 error_report("Failed to open %s: %m", device
);
378 ret
= nbd_init(fd
, sioc
, &info
, &local_error
);
380 error_report_err(local_error
);
384 /* update partition table */
385 pthread_create(&show_parts_thread
, NULL
, show_parts
, device
);
388 fprintf(stderr
, "NBD device %s is now connected to %s\n",
391 /* Close stderr so that the qemu-nbd process exits. */
392 dup2(STDOUT_FILENO
, STDERR_FILENO
);
395 ret
= nbd_client(fd
);
400 object_unref(OBJECT(sioc
));
402 kill(getpid(), SIGTERM
);
403 return (void *) EXIT_SUCCESS
;
408 object_unref(OBJECT(sioc
));
411 kill(getpid(), SIGTERM
);
412 return (void *) EXIT_FAILURE
;
414 #endif /* HAVE_NBD_DEVICE */
416 static int nbd_can_accept(void)
418 return state
== RUNNING
&& nb_fds
< shared
;
421 static void nbd_export_closed(NBDExport
*export
)
423 assert(state
== TERMINATING
);
427 static void nbd_update_server_watch(void);
429 static void nbd_client_closed(NBDClient
*client
, bool negotiated
)
432 if (negotiated
&& nb_fds
== 0 && !persistent
&& state
== RUNNING
) {
435 nbd_update_server_watch();
436 nbd_client_put(client
);
439 static void nbd_accept(QIONetListener
*listener
, QIOChannelSocket
*cioc
,
442 if (state
>= TERMINATE
) {
447 nbd_update_server_watch();
448 nbd_client_new(cioc
, tlscreds
, tlsauthz
, nbd_client_closed
);
451 static void nbd_update_server_watch(void)
453 if (nbd_can_accept()) {
454 qio_net_listener_set_client_func(server
, nbd_accept
, NULL
, NULL
);
456 qio_net_listener_set_client_func(server
, NULL
, NULL
, NULL
);
461 static SocketAddress
*nbd_build_socket_address(const char *sockpath
,
465 SocketAddress
*saddr
;
467 saddr
= g_new0(SocketAddress
, 1);
469 saddr
->type
= SOCKET_ADDRESS_TYPE_UNIX
;
470 saddr
->u
.q_unix
.path
= g_strdup(sockpath
);
472 InetSocketAddress
*inet
;
473 saddr
->type
= SOCKET_ADDRESS_TYPE_INET
;
474 inet
= &saddr
->u
.inet
;
475 inet
->host
= g_strdup(bindto
);
477 inet
->port
= g_strdup(port
);
479 inet
->port
= g_strdup_printf("%d", NBD_DEFAULT_PORT
);
487 static QemuOptsList file_opts
= {
489 .implied_opt_name
= "file",
490 .head
= QTAILQ_HEAD_INITIALIZER(file_opts
.head
),
492 /* no elements => accept any params */
493 { /* end of list */ }
497 static QemuOptsList qemu_object_opts
= {
499 .implied_opt_name
= "qom-type",
500 .head
= QTAILQ_HEAD_INITIALIZER(qemu_object_opts
.head
),
508 static QCryptoTLSCreds
*nbd_get_tls_creds(const char *id
, bool list
,
512 QCryptoTLSCreds
*creds
;
514 obj
= object_resolve_path_component(
515 object_get_objects_root(), id
);
517 error_setg(errp
, "No TLS credentials with id '%s'",
521 creds
= (QCryptoTLSCreds
*)
522 object_dynamic_cast(obj
, TYPE_QCRYPTO_TLS_CREDS
);
524 error_setg(errp
, "Object with id '%s' is not TLS credentials",
530 if (creds
->endpoint
!= QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT
) {
532 "Expecting TLS credentials with a client endpoint");
536 if (creds
->endpoint
!= QCRYPTO_TLS_CREDS_ENDPOINT_SERVER
) {
538 "Expecting TLS credentials with a server endpoint");
546 static void setup_address_and_port(const char **address
, const char **port
)
548 if (*address
== NULL
) {
549 *address
= "0.0.0.0";
553 *port
= stringify(NBD_DEFAULT_PORT
);
558 * Check socket parameters compatibility when socket activation is used.
560 static const char *socket_activation_validate_opts(const char *device
,
561 const char *sockpath
,
566 if (device
!= NULL
) {
567 return "NBD device can't be set when using socket activation";
570 if (sockpath
!= NULL
) {
571 return "Unix socket can't be set when using socket activation";
574 if (address
!= NULL
) {
575 return "The interface can't be set when using socket activation";
579 return "TCP port number can't be set when using socket activation";
583 return "List mode is incompatible with socket activation";
589 static void qemu_nbd_shutdown(void)
591 job_cancel_sync_all();
595 int main(int argc
, char **argv
)
598 BlockDriverState
*bs
;
599 uint64_t dev_offset
= 0;
600 uint16_t nbdflags
= 0;
601 bool disconnect
= false;
602 const char *bindto
= NULL
;
603 const char *port
= NULL
;
604 char *sockpath
= NULL
;
607 QemuOpts
*sn_opts
= NULL
;
608 const char *sn_id_or_name
= NULL
;
609 const char *sopt
= "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:B:L";
610 struct option lopt
[] = {
611 { "help", no_argument
, NULL
, 'h' },
612 { "version", no_argument
, NULL
, 'V' },
613 { "bind", required_argument
, NULL
, 'b' },
614 { "port", required_argument
, NULL
, 'p' },
615 { "socket", required_argument
, NULL
, 'k' },
616 { "offset", required_argument
, NULL
, 'o' },
617 { "read-only", no_argument
, NULL
, 'r' },
618 { "partition", required_argument
, NULL
, 'P' },
619 { "bitmap", required_argument
, NULL
, 'B' },
620 { "connect", required_argument
, NULL
, 'c' },
621 { "disconnect", no_argument
, NULL
, 'd' },
622 { "list", no_argument
, NULL
, 'L' },
623 { "snapshot", no_argument
, NULL
, 's' },
624 { "load-snapshot", required_argument
, NULL
, 'l' },
625 { "nocache", no_argument
, NULL
, 'n' },
626 { "cache", required_argument
, NULL
, QEMU_NBD_OPT_CACHE
},
627 { "aio", required_argument
, NULL
, QEMU_NBD_OPT_AIO
},
628 { "discard", required_argument
, NULL
, QEMU_NBD_OPT_DISCARD
},
629 { "detect-zeroes", required_argument
, NULL
,
630 QEMU_NBD_OPT_DETECT_ZEROES
},
631 { "shared", required_argument
, NULL
, 'e' },
632 { "format", required_argument
, NULL
, 'f' },
633 { "persistent", no_argument
, NULL
, 't' },
634 { "verbose", no_argument
, NULL
, 'v' },
635 { "object", required_argument
, NULL
, QEMU_NBD_OPT_OBJECT
},
636 { "export-name", required_argument
, NULL
, 'x' },
637 { "description", required_argument
, NULL
, 'D' },
638 { "tls-creds", required_argument
, NULL
, QEMU_NBD_OPT_TLSCREDS
},
639 { "tls-authz", required_argument
, NULL
, QEMU_NBD_OPT_TLSAUTHZ
},
640 { "image-opts", no_argument
, NULL
, QEMU_NBD_OPT_IMAGE_OPTS
},
641 { "trace", required_argument
, NULL
, 'T' },
642 { "fork", no_argument
, NULL
, QEMU_NBD_OPT_FORK
},
647 int flags
= BDRV_O_RDWR
;
650 bool seen_cache
= false;
651 bool seen_discard
= false;
652 bool seen_aio
= false;
653 pthread_t client_thread
;
654 const char *fmt
= NULL
;
655 Error
*local_err
= NULL
;
656 BlockdevDetectZeroesOptions detect_zeroes
= BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
;
657 QDict
*options
= NULL
;
658 const char *export_name
= NULL
; /* defaults to "" later for server mode */
659 const char *export_description
= NULL
;
660 const char *bitmap
= NULL
;
661 const char *tlscredsid
= NULL
;
662 bool imageOpts
= false;
663 bool writethrough
= true;
664 char *trace_file
= NULL
;
665 bool fork_process
= false;
668 unsigned socket_activation
;
670 /* The client thread uses SIGTERM to interrupt the server. A signal
671 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
673 struct sigaction sa_sigterm
;
674 memset(&sa_sigterm
, 0, sizeof(sa_sigterm
));
675 sa_sigterm
.sa_handler
= termsig_handler
;
676 sigaction(SIGTERM
, &sa_sigterm
, NULL
);
679 signal(SIGPIPE
, SIG_IGN
);
683 module_call_init(MODULE_INIT_TRACE
);
684 qcrypto_init(&error_fatal
);
686 module_call_init(MODULE_INIT_QOM
);
687 qemu_add_opts(&qemu_object_opts
);
688 qemu_add_opts(&qemu_trace_opts
);
689 qemu_init_exec_dir(argv
[0]);
691 while ((ch
= getopt_long(argc
, argv
, sopt
, lopt
, &opt_ind
)) != -1) {
694 flags
|= BDRV_O_SNAPSHOT
;
697 optarg
= (char *) "none";
699 case QEMU_NBD_OPT_CACHE
:
701 error_report("-n and --cache can only be specified once");
705 if (bdrv_parse_cache_mode(optarg
, &flags
, &writethrough
) == -1) {
706 error_report("Invalid cache mode `%s'", optarg
);
710 case QEMU_NBD_OPT_AIO
:
712 error_report("--aio can only be specified once");
716 if (!strcmp(optarg
, "native")) {
717 flags
|= BDRV_O_NATIVE_AIO
;
718 } else if (!strcmp(optarg
, "threads")) {
719 /* this is the default */
721 error_report("invalid aio mode `%s'", optarg
);
725 case QEMU_NBD_OPT_DISCARD
:
727 error_report("--discard can only be specified once");
731 if (bdrv_parse_discard_flags(optarg
, &flags
) == -1) {
732 error_report("Invalid discard mode `%s'", optarg
);
736 case QEMU_NBD_OPT_DETECT_ZEROES
:
738 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup
,
740 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
,
743 error_reportf_err(local_err
,
744 "Failed to parse detect_zeroes mode: ");
747 if (detect_zeroes
== BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP
&&
748 !(flags
& BDRV_O_UNMAP
)) {
749 error_report("setting detect-zeroes to unmap is not allowed "
750 "without setting discard operation to unmap");
761 if (qemu_strtou64(optarg
, NULL
, 0, &dev_offset
) < 0) {
762 error_report("Invalid offset '%s'", optarg
);
767 if (strstart(optarg
, SNAPSHOT_OPT_BASE
, NULL
)) {
768 sn_opts
= qemu_opts_parse_noisily(&internal_snapshot_opts
,
771 error_report("Failed in parsing snapshot param `%s'",
776 sn_id_or_name
= optarg
;
780 nbdflags
|= NBD_FLAG_READ_ONLY
;
781 flags
&= ~BDRV_O_RDWR
;
784 warn_report("The '-P' option is deprecated; use --image-opts with "
785 "a raw device wrapper for subset exports instead");
786 if (qemu_strtoi(optarg
, NULL
, 0, &partition
) < 0 ||
787 partition
< 1 || partition
> 8) {
788 error_report("Invalid partition '%s'", optarg
);
797 if (sockpath
[0] != '/') {
798 error_report("socket path must be absolute");
809 if (qemu_strtoi(optarg
, NULL
, 0, &shared
) < 0 ||
811 error_report("Invalid shared device number '%s'", optarg
);
822 export_name
= optarg
;
825 export_description
= optarg
;
839 error_report("Try `%s --help' for more information.", argv
[0]);
841 case QEMU_NBD_OPT_OBJECT
: {
843 opts
= qemu_opts_parse_noisily(&qemu_object_opts
,
849 case QEMU_NBD_OPT_TLSCREDS
:
852 case QEMU_NBD_OPT_IMAGE_OPTS
:
857 trace_file
= trace_opt_parse(optarg
);
859 case QEMU_NBD_OPT_TLSAUTHZ
:
862 case QEMU_NBD_OPT_FORK
:
872 if (argc
!= optind
) {
873 error_report("List mode is incompatible with a file name");
876 if (export_name
|| export_description
|| dev_offset
|| partition
||
877 device
|| disconnect
|| fmt
|| sn_id_or_name
|| bitmap
||
878 seen_aio
|| seen_discard
|| seen_cache
) {
879 error_report("List mode is incompatible with per-device settings");
883 error_report("List mode is incompatible with forking");
886 } else if ((argc
- optind
) != 1) {
887 error_report("Invalid number of arguments");
888 error_printf("Try `%s --help' for more information.\n", argv
[0]);
890 } else if (!export_name
) {
894 qemu_opts_foreach(&qemu_object_opts
,
895 user_creatable_add_opts_foreach
,
898 if (!trace_init_backends()) {
901 trace_init_file(trace_file
);
902 qemu_set_log(LOG_TRACE
);
904 socket_activation
= check_socket_activation();
905 if (socket_activation
== 0) {
906 setup_address_and_port(&bindto
, &port
);
908 /* Using socket activation - check user didn't use -p etc. */
909 const char *err_msg
= socket_activation_validate_opts(device
, sockpath
,
912 if (err_msg
!= NULL
) {
913 error_report("%s", err_msg
);
917 /* qemu-nbd can only listen on a single socket. */
918 if (socket_activation
> 1) {
919 error_report("qemu-nbd does not support socket activation with %s > 1",
927 error_report("TLS is only supported with IPv4/IPv6");
931 error_report("TLS is not supported with a host device");
934 if (tlsauthz
&& list
) {
935 error_report("TLS authorization is incompatible with export list");
938 tlscreds
= nbd_get_tls_creds(tlscredsid
, list
, &local_err
);
940 error_report("Failed to get TLS creds %s",
941 error_get_pretty(local_err
));
946 error_report("--tls-authz is not permitted without --tls-creds");
952 saddr
= nbd_build_socket_address(sockpath
, bindto
, port
);
953 return qemu_nbd_client_list(saddr
, tlscreds
, bindto
);
957 if (disconnect
|| device
) {
958 error_report("Kernel /dev/nbdN support not available");
961 #else /* HAVE_NBD_DEVICE */
963 int nbdfd
= open(argv
[optind
], O_RDWR
);
965 error_report("Cannot open %s: %s", argv
[optind
],
969 nbd_disconnect(nbdfd
);
973 printf("%s disconnected\n", argv
[optind
]);
979 if ((device
&& !verbose
) || fork_process
) {
984 if (qemu_pipe(stderr_fd
) < 0) {
985 error_report("Error setting up communication pipe: %s",
990 /* Now daemonize, but keep a communication channel open to
991 * print errors and exit with the proper status code.
995 error_report("Failed to fork: %s", strerror(errno
));
997 } else if (pid
== 0) {
999 ret
= qemu_daemon(1, 0);
1001 /* Temporarily redirect stderr to the parent's pipe... */
1002 old_stderr
= dup(STDERR_FILENO
);
1003 dup2(stderr_fd
[1], STDERR_FILENO
);
1005 error_report("Failed to daemonize: %s", strerror(errno
));
1009 /* ... close the descriptor we inherited and go on. */
1010 close(stderr_fd
[1]);
1012 bool errors
= false;
1015 /* In the parent. Print error messages from the child until
1016 * it closes the pipe.
1018 close(stderr_fd
[1]);
1019 buf
= g_malloc(1024);
1020 while ((ret
= read(stderr_fd
[0], buf
, 1024)) > 0) {
1022 ret
= qemu_write_full(STDERR_FILENO
, buf
, ret
);
1028 error_report("Cannot read from daemon: %s",
1033 /* Usually the daemon should not print any message.
1034 * Exit with zero status in that case.
1040 if (device
!= NULL
&& sockpath
== NULL
) {
1041 sockpath
= g_malloc(128);
1042 snprintf(sockpath
, 128, SOCKET_PATH
, basename(device
));
1045 server
= qio_net_listener_new();
1046 if (socket_activation
== 0) {
1047 saddr
= nbd_build_socket_address(sockpath
, bindto
, port
);
1048 if (qio_net_listener_open_sync(server
, saddr
, &local_err
) < 0) {
1049 object_unref(OBJECT(server
));
1050 error_report_err(local_err
);
1055 /* See comment in check_socket_activation above. */
1056 for (i
= 0; i
< socket_activation
; i
++) {
1057 QIOChannelSocket
*sioc
;
1058 sioc
= qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD
+ i
,
1061 object_unref(OBJECT(server
));
1062 error_report("Failed to use socket activation: %s",
1063 error_get_pretty(local_err
));
1066 qio_net_listener_add(server
, sioc
);
1067 object_unref(OBJECT(sioc
));
1071 if (qemu_init_main_loop(&local_err
)) {
1072 error_report_err(local_err
);
1076 atexit(qemu_nbd_shutdown
);
1078 srcpath
= argv
[optind
];
1082 error_report("--image-opts and -f are mutually exclusive");
1085 opts
= qemu_opts_parse_noisily(&file_opts
, srcpath
, true);
1087 qemu_opts_reset(&file_opts
);
1090 options
= qemu_opts_to_qdict(opts
, NULL
);
1091 qemu_opts_reset(&file_opts
);
1092 blk
= blk_new_open(NULL
, NULL
, options
, flags
, &local_err
);
1095 options
= qdict_new();
1096 qdict_put_str(options
, "driver", fmt
);
1098 blk
= blk_new_open(srcpath
, NULL
, options
, flags
, &local_err
);
1102 error_reportf_err(local_err
, "Failed to blk_new_open '%s': ",
1108 blk_set_enable_write_cache(blk
, !writethrough
);
1111 ret
= bdrv_snapshot_load_tmp(bs
,
1112 qemu_opt_get(sn_opts
, SNAPSHOT_OPT_ID
),
1113 qemu_opt_get(sn_opts
, SNAPSHOT_OPT_NAME
),
1115 } else if (sn_id_or_name
) {
1116 ret
= bdrv_snapshot_load_tmp_by_id_or_name(bs
, sn_id_or_name
,
1120 error_reportf_err(local_err
, "Failed to load snapshot: ");
1124 bs
->detect_zeroes
= detect_zeroes
;
1125 fd_size
= blk_getlength(blk
);
1127 error_report("Failed to determine the image length: %s",
1128 strerror(-fd_size
));
1132 if (dev_offset
>= fd_size
) {
1133 error_report("Offset (%" PRIu64
") has to be smaller than the image "
1134 "size (%" PRId64
")", dev_offset
, fd_size
);
1137 fd_size
-= dev_offset
;
1143 error_report("Cannot request partition and offset together");
1146 ret
= find_partition(blk
, partition
, &dev_offset
, &limit
);
1148 error_report("Could not find partition %d: %s", partition
,
1153 * MBR partition limits are (32-bit << 9); this assert lets
1154 * the compiler know that we can't overflow 64 bits.
1156 assert(dev_offset
+ limit
>= dev_offset
);
1157 if (dev_offset
+ limit
> fd_size
) {
1158 error_report("Discovered partition %d at offset %" PRIu64
1159 " size %" PRIu64
", but size exceeds file length %"
1160 PRId64
, partition
, dev_offset
, limit
, fd_size
);
1166 export
= nbd_export_new(bs
, dev_offset
, fd_size
, export_name
,
1167 export_description
, bitmap
, nbdflags
,
1168 nbd_export_closed
, writethrough
, NULL
,
1175 ret
= pthread_create(&client_thread
, NULL
, nbd_client_thread
, device
);
1177 error_report("Failed to create client thread: %s", strerror(ret
));
1182 /* Shut up GCC warnings. */
1183 memset(&client_thread
, 0, sizeof(client_thread
));
1186 nbd_update_server_watch();
1188 /* now when the initialization is (almost) complete, chdir("/")
1189 * to free any busy filesystems */
1190 if (chdir("/") < 0) {
1191 error_report("Could not chdir to root directory: %s",
1197 dup2(old_stderr
, STDERR_FILENO
);
1203 main_loop_wait(false);
1204 if (state
== TERMINATE
) {
1205 state
= TERMINATING
;
1206 nbd_export_close(export
);
1207 nbd_export_put(export
);
1210 } while (state
!= TERMINATED
);
1217 qemu_opts_del(sn_opts
);
1221 pthread_join(client_thread
, &ret
);