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 "qemu-common.h"
25 #include "qapi/error.h"
26 #include "qemu/cutils.h"
27 #include "sysemu/block-backend.h"
28 #include "block/block_int.h"
29 #include "block/nbd.h"
30 #include "qemu/main-loop.h"
31 #include "qemu/module.h"
32 #include "qemu/option.h"
33 #include "qemu/error-report.h"
34 #include "qemu/config-file.h"
35 #include "qemu/bswap.h"
37 #include "qemu/systemd.h"
38 #include "block/snapshot.h"
39 #include "qapi/qmp/qdict.h"
40 #include "qapi/qmp/qstring.h"
41 #include "qom/object_interfaces.h"
42 #include "io/channel-socket.h"
43 #include "io/net-listener.h"
44 #include "crypto/init.h"
45 #include "trace/control.h"
46 #include "qemu-version.h"
49 #define HAVE_NBD_DEVICE 1
51 #define HAVE_NBD_DEVICE 0
54 #define SOCKET_PATH "/var/lock/qemu-nbd-%s"
55 #define QEMU_NBD_OPT_CACHE 256
56 #define QEMU_NBD_OPT_AIO 257
57 #define QEMU_NBD_OPT_DISCARD 258
58 #define QEMU_NBD_OPT_DETECT_ZEROES 259
59 #define QEMU_NBD_OPT_OBJECT 260
60 #define QEMU_NBD_OPT_TLSCREDS 261
61 #define QEMU_NBD_OPT_IMAGE_OPTS 262
62 #define QEMU_NBD_OPT_FORK 263
63 #define QEMU_NBD_OPT_TLSAUTHZ 264
67 static NBDExport
*export
;
70 static SocketAddress
*saddr
;
71 static int persistent
= 0;
72 static enum { RUNNING
, TERMINATE
, TERMINATING
, TERMINATED
} state
;
73 static int shared
= 1;
75 static QIONetListener
*server
;
76 static QCryptoTLSCreds
*tlscreds
;
77 static const char *tlsauthz
;
79 static void usage(const char *name
)
82 "Usage: %s [OPTIONS] FILE\n"
83 " or: %s -L [OPTIONS]\n"
84 "QEMU Disk Network Block Device Utility\n"
86 " -h, --help display this help and exit\n"
87 " -V, --version output version information and exit\n"
89 "Connection properties:\n"
90 " -p, --port=PORT port to listen on (default `%d')\n"
91 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
92 " -k, --socket=PATH path to the unix socket\n"
93 " (default '"SOCKET_PATH
"')\n"
94 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
95 " -t, --persistent don't exit on the last connection\n"
96 " -v, --verbose display extra debugging information\n"
97 " -x, --export-name=NAME expose export by name (default is empty string)\n"
98 " -D, --description=TEXT export a human-readable description\n"
100 "Exposing part of the image:\n"
101 " -o, --offset=OFFSET offset into the image\n"
102 " -P, --partition=NUM only expose partition NUM\n"
103 " -B, --bitmap=NAME expose a persistent dirty bitmap\n"
105 "General purpose options:\n"
106 " -L, --list list exports available from another NBD server\n"
107 " --object type,id=ID,... define an object such as 'secret' for providing\n"
108 " passwords and/or encryption keys\n"
109 " --tls-creds=ID use id of an earlier --object to provide TLS\n"
110 " --tls-authz=ID use id of an earlier --object to provide\n"
112 " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
113 " specify tracing options\n"
114 " --fork fork off the server process and exit the parent\n"
115 " once the server is running\n"
118 "Kernel NBD client support:\n"
119 " -c, --connect=DEV connect FILE to the local NBD device DEV\n"
120 " -d, --disconnect disconnect the specified device\n"
123 "Block device options:\n"
124 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
125 " -r, --read-only export read-only\n"
126 " -s, --snapshot use FILE as an external snapshot, create a temporary\n"
127 " file with backing_file=FILE, redirect the write to\n"
128 " the temporary one\n"
129 " -l, --load-snapshot=SNAPSHOT_PARAM\n"
130 " load an internal snapshot inside FILE and export it\n"
131 " as an read-only device, SNAPSHOT_PARAM format is\n"
132 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
134 " -n, --nocache disable host cache\n"
135 " --cache=MODE set cache mode (none, writeback, ...)\n"
136 " --aio=MODE set AIO mode (native or threads)\n"
137 " --discard=MODE set discard mode (ignore, unmap)\n"
138 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
139 " --image-opts treat FILE as a full set of image options\n"
141 QEMU_HELP_BOTTOM
"\n"
142 , name
, name
, NBD_DEFAULT_PORT
, "DEVICE");
145 static void version(const char *name
)
148 "%s " QEMU_FULL_VERSION
"\n"
149 "Written by Anthony Liguori.\n"
152 "This is free software; see the source for copying conditions. There is NO\n"
153 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
157 struct partition_record
161 uint32_t start_cylinder
;
162 uint8_t start_sector
;
165 uint8_t end_cylinder
;
167 uint32_t start_sector_abs
;
168 uint32_t nb_sectors_abs
;
171 static void read_partition(uint8_t *p
, struct partition_record
*r
)
174 r
->start_head
= p
[1];
175 r
->start_cylinder
= p
[3] | ((p
[2] << 2) & 0x0300);
176 r
->start_sector
= p
[2] & 0x3f;
179 r
->end_cylinder
= p
[7] | ((p
[6] << 2) & 0x300);
180 r
->end_sector
= p
[6] & 0x3f;
182 r
->start_sector_abs
= ldl_le_p(p
+ 8);
183 r
->nb_sectors_abs
= ldl_le_p(p
+ 12);
186 static int find_partition(BlockBackend
*blk
, int partition
,
187 uint64_t *offset
, uint64_t *size
)
189 struct partition_record mbr
[4];
190 uint8_t data
[MBR_SIZE
];
195 ret
= blk_pread(blk
, 0, data
, sizeof(data
));
197 error_report("error while reading: %s", strerror(-ret
));
201 if (data
[510] != 0x55 || data
[511] != 0xaa) {
205 for (i
= 0; i
< 4; i
++) {
206 read_partition(&data
[446 + 16 * i
], &mbr
[i
]);
208 if (!mbr
[i
].system
|| !mbr
[i
].nb_sectors_abs
) {
212 if (mbr
[i
].system
== 0xF || mbr
[i
].system
== 0x5) {
213 struct partition_record ext
[4];
214 uint8_t data1
[MBR_SIZE
];
217 ret
= blk_pread(blk
, mbr
[i
].start_sector_abs
* MBR_SIZE
,
218 data1
, sizeof(data1
));
220 error_report("error while reading: %s", strerror(-ret
));
224 for (j
= 0; j
< 4; j
++) {
225 read_partition(&data1
[446 + 16 * j
], &ext
[j
]);
226 if (!ext
[j
].system
|| !ext
[j
].nb_sectors_abs
) {
230 if ((ext_partnum
+ j
+ 1) == partition
) {
231 *offset
= (uint64_t)ext
[j
].start_sector_abs
<< 9;
232 *size
= (uint64_t)ext
[j
].nb_sectors_abs
<< 9;
237 } else if ((i
+ 1) == partition
) {
238 *offset
= (uint64_t)mbr
[i
].start_sector_abs
<< 9;
239 *size
= (uint64_t)mbr
[i
].nb_sectors_abs
<< 9;
247 static void termsig_handler(int signum
)
249 atomic_cmpxchg(&state
, RUNNING
, TERMINATE
);
254 static int qemu_nbd_client_list(SocketAddress
*saddr
, QCryptoTLSCreds
*tls
,
255 const char *hostname
)
257 int ret
= EXIT_FAILURE
;
260 QIOChannelSocket
*sioc
;
264 sioc
= qio_channel_socket_new();
265 if (qio_channel_socket_connect_sync(sioc
, saddr
, &err
) < 0) {
266 error_report_err(err
);
269 rc
= nbd_receive_export_list(QIO_CHANNEL(sioc
), tls
, hostname
, &list
,
273 error_report_err(err
);
277 printf("exports available: %d\n", rc
);
278 for (i
= 0; i
< rc
; i
++) {
279 printf(" export: '%s'\n", list
[i
].name
);
280 if (list
[i
].description
&& *list
[i
].description
) {
281 printf(" description: %s\n", list
[i
].description
);
283 if (list
[i
].flags
& NBD_FLAG_HAS_FLAGS
) {
284 static const char *const flag_names
[] = {
285 [NBD_FLAG_READ_ONLY_BIT
] = "readonly",
286 [NBD_FLAG_SEND_FLUSH_BIT
] = "flush",
287 [NBD_FLAG_SEND_FUA_BIT
] = "fua",
288 [NBD_FLAG_ROTATIONAL_BIT
] = "rotational",
289 [NBD_FLAG_SEND_TRIM_BIT
] = "trim",
290 [NBD_FLAG_SEND_WRITE_ZEROES_BIT
] = "zeroes",
291 [NBD_FLAG_SEND_DF_BIT
] = "df",
292 [NBD_FLAG_CAN_MULTI_CONN_BIT
] = "multi",
293 [NBD_FLAG_SEND_RESIZE_BIT
] = "resize",
294 [NBD_FLAG_SEND_CACHE_BIT
] = "cache",
297 printf(" size: %" PRIu64
"\n", list
[i
].size
);
298 printf(" flags: 0x%x (", list
[i
].flags
);
299 for (size_t bit
= 0; bit
< ARRAY_SIZE(flag_names
); bit
++) {
300 if (flag_names
[bit
] && (list
[i
].flags
& (1 << bit
))) {
301 printf(" %s", flag_names
[bit
]);
306 if (list
[i
].min_block
) {
307 printf(" min block: %u\n", list
[i
].min_block
);
308 printf(" opt block: %u\n", list
[i
].opt_block
);
309 printf(" max block: %u\n", list
[i
].max_block
);
311 if (list
[i
].n_contexts
) {
312 printf(" available meta contexts: %d\n", list
[i
].n_contexts
);
313 for (j
= 0; j
< list
[i
].n_contexts
; j
++) {
314 printf(" %s\n", list
[i
].contexts
[j
]);
318 nbd_free_export_list(list
, rc
);
322 object_unref(OBJECT(sioc
));
328 static void *show_parts(void *arg
)
333 /* linux just needs an open() to trigger
334 * the partition table update
335 * but remember to load the module with max_part != 0 :
336 * modprobe nbd max_part=63
338 nbd
= open(device
, O_RDWR
);
345 static void *nbd_client_thread(void *arg
)
348 NBDExportInfo info
= { .request_sizes
= false, .name
= g_strdup("") };
349 QIOChannelSocket
*sioc
;
352 pthread_t show_parts_thread
;
353 Error
*local_error
= NULL
;
355 sioc
= qio_channel_socket_new();
356 if (qio_channel_socket_connect_sync(sioc
,
359 error_report_err(local_error
);
363 ret
= nbd_receive_negotiate(QIO_CHANNEL(sioc
),
364 NULL
, NULL
, NULL
, &info
, &local_error
);
367 error_report_err(local_error
);
372 fd
= open(device
, O_RDWR
);
374 /* Linux-only, we can use %m in printf. */
375 error_report("Failed to open %s: %m", device
);
379 ret
= nbd_init(fd
, sioc
, &info
, &local_error
);
381 error_report_err(local_error
);
385 /* update partition table */
386 pthread_create(&show_parts_thread
, NULL
, show_parts
, device
);
389 fprintf(stderr
, "NBD device %s is now connected to %s\n",
392 /* Close stderr so that the qemu-nbd process exits. */
393 dup2(STDOUT_FILENO
, STDERR_FILENO
);
396 ret
= nbd_client(fd
);
401 object_unref(OBJECT(sioc
));
403 kill(getpid(), SIGTERM
);
404 return (void *) EXIT_SUCCESS
;
409 object_unref(OBJECT(sioc
));
412 kill(getpid(), SIGTERM
);
413 return (void *) EXIT_FAILURE
;
415 #endif /* HAVE_NBD_DEVICE */
417 static int nbd_can_accept(void)
419 return state
== RUNNING
&& nb_fds
< shared
;
422 static void nbd_export_closed(NBDExport
*export
)
424 assert(state
== TERMINATING
);
428 static void nbd_update_server_watch(void);
430 static void nbd_client_closed(NBDClient
*client
, bool negotiated
)
433 if (negotiated
&& nb_fds
== 0 && !persistent
&& state
== RUNNING
) {
436 nbd_update_server_watch();
437 nbd_client_put(client
);
440 static void nbd_accept(QIONetListener
*listener
, QIOChannelSocket
*cioc
,
443 if (state
>= TERMINATE
) {
448 nbd_update_server_watch();
449 nbd_client_new(cioc
, tlscreds
, tlsauthz
, nbd_client_closed
);
452 static void nbd_update_server_watch(void)
454 if (nbd_can_accept()) {
455 qio_net_listener_set_client_func(server
, nbd_accept
, NULL
, NULL
);
457 qio_net_listener_set_client_func(server
, NULL
, NULL
, NULL
);
462 static SocketAddress
*nbd_build_socket_address(const char *sockpath
,
466 SocketAddress
*saddr
;
468 saddr
= g_new0(SocketAddress
, 1);
470 saddr
->type
= SOCKET_ADDRESS_TYPE_UNIX
;
471 saddr
->u
.q_unix
.path
= g_strdup(sockpath
);
473 InetSocketAddress
*inet
;
474 saddr
->type
= SOCKET_ADDRESS_TYPE_INET
;
475 inet
= &saddr
->u
.inet
;
476 inet
->host
= g_strdup(bindto
);
478 inet
->port
= g_strdup(port
);
480 inet
->port
= g_strdup_printf("%d", NBD_DEFAULT_PORT
);
488 static QemuOptsList file_opts
= {
490 .implied_opt_name
= "file",
491 .head
= QTAILQ_HEAD_INITIALIZER(file_opts
.head
),
493 /* no elements => accept any params */
494 { /* end of list */ }
498 static QemuOptsList qemu_object_opts
= {
500 .implied_opt_name
= "qom-type",
501 .head
= QTAILQ_HEAD_INITIALIZER(qemu_object_opts
.head
),
509 static QCryptoTLSCreds
*nbd_get_tls_creds(const char *id
, bool list
,
513 QCryptoTLSCreds
*creds
;
515 obj
= object_resolve_path_component(
516 object_get_objects_root(), id
);
518 error_setg(errp
, "No TLS credentials with id '%s'",
522 creds
= (QCryptoTLSCreds
*)
523 object_dynamic_cast(obj
, TYPE_QCRYPTO_TLS_CREDS
);
525 error_setg(errp
, "Object with id '%s' is not TLS credentials",
531 if (creds
->endpoint
!= QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT
) {
533 "Expecting TLS credentials with a client endpoint");
537 if (creds
->endpoint
!= QCRYPTO_TLS_CREDS_ENDPOINT_SERVER
) {
539 "Expecting TLS credentials with a server endpoint");
547 static void setup_address_and_port(const char **address
, const char **port
)
549 if (*address
== NULL
) {
550 *address
= "0.0.0.0";
554 *port
= stringify(NBD_DEFAULT_PORT
);
559 * Check socket parameters compatibility when socket activation is used.
561 static const char *socket_activation_validate_opts(const char *device
,
562 const char *sockpath
,
567 if (device
!= NULL
) {
568 return "NBD device can't be set when using socket activation";
571 if (sockpath
!= NULL
) {
572 return "Unix socket can't be set when using socket activation";
575 if (address
!= NULL
) {
576 return "The interface can't be set when using socket activation";
580 return "TCP port number can't be set when using socket activation";
584 return "List mode is incompatible with socket activation";
590 static void qemu_nbd_shutdown(void)
592 job_cancel_sync_all();
596 int main(int argc
, char **argv
)
599 BlockDriverState
*bs
;
600 uint64_t dev_offset
= 0;
601 uint16_t nbdflags
= 0;
602 bool disconnect
= false;
603 const char *bindto
= NULL
;
604 const char *port
= NULL
;
605 char *sockpath
= NULL
;
608 QemuOpts
*sn_opts
= NULL
;
609 const char *sn_id_or_name
= NULL
;
610 const char *sopt
= "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:B:L";
611 struct option lopt
[] = {
612 { "help", no_argument
, NULL
, 'h' },
613 { "version", no_argument
, NULL
, 'V' },
614 { "bind", required_argument
, NULL
, 'b' },
615 { "port", required_argument
, NULL
, 'p' },
616 { "socket", required_argument
, NULL
, 'k' },
617 { "offset", required_argument
, NULL
, 'o' },
618 { "read-only", no_argument
, NULL
, 'r' },
619 { "partition", required_argument
, NULL
, 'P' },
620 { "bitmap", required_argument
, NULL
, 'B' },
621 { "connect", required_argument
, NULL
, 'c' },
622 { "disconnect", no_argument
, NULL
, 'd' },
623 { "list", no_argument
, NULL
, 'L' },
624 { "snapshot", no_argument
, NULL
, 's' },
625 { "load-snapshot", required_argument
, NULL
, 'l' },
626 { "nocache", no_argument
, NULL
, 'n' },
627 { "cache", required_argument
, NULL
, QEMU_NBD_OPT_CACHE
},
628 { "aio", required_argument
, NULL
, QEMU_NBD_OPT_AIO
},
629 { "discard", required_argument
, NULL
, QEMU_NBD_OPT_DISCARD
},
630 { "detect-zeroes", required_argument
, NULL
,
631 QEMU_NBD_OPT_DETECT_ZEROES
},
632 { "shared", required_argument
, NULL
, 'e' },
633 { "format", required_argument
, NULL
, 'f' },
634 { "persistent", no_argument
, NULL
, 't' },
635 { "verbose", no_argument
, NULL
, 'v' },
636 { "object", required_argument
, NULL
, QEMU_NBD_OPT_OBJECT
},
637 { "export-name", required_argument
, NULL
, 'x' },
638 { "description", required_argument
, NULL
, 'D' },
639 { "tls-creds", required_argument
, NULL
, QEMU_NBD_OPT_TLSCREDS
},
640 { "tls-authz", required_argument
, NULL
, QEMU_NBD_OPT_TLSAUTHZ
},
641 { "image-opts", no_argument
, NULL
, QEMU_NBD_OPT_IMAGE_OPTS
},
642 { "trace", required_argument
, NULL
, 'T' },
643 { "fork", no_argument
, NULL
, QEMU_NBD_OPT_FORK
},
648 int flags
= BDRV_O_RDWR
;
651 bool seen_cache
= false;
652 bool seen_discard
= false;
653 bool seen_aio
= false;
654 pthread_t client_thread
;
655 const char *fmt
= NULL
;
656 Error
*local_err
= NULL
;
657 BlockdevDetectZeroesOptions detect_zeroes
= BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
;
658 QDict
*options
= NULL
;
659 const char *export_name
= NULL
; /* defaults to "" later for server mode */
660 const char *export_description
= NULL
;
661 const char *bitmap
= NULL
;
662 const char *tlscredsid
= NULL
;
663 bool imageOpts
= false;
664 bool writethrough
= true;
665 char *trace_file
= NULL
;
666 bool fork_process
= false;
669 unsigned socket_activation
;
671 /* The client thread uses SIGTERM to interrupt the server. A signal
672 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
674 struct sigaction sa_sigterm
;
675 memset(&sa_sigterm
, 0, sizeof(sa_sigterm
));
676 sa_sigterm
.sa_handler
= termsig_handler
;
677 sigaction(SIGTERM
, &sa_sigterm
, NULL
);
680 signal(SIGPIPE
, SIG_IGN
);
684 module_call_init(MODULE_INIT_TRACE
);
685 qcrypto_init(&error_fatal
);
687 module_call_init(MODULE_INIT_QOM
);
688 qemu_add_opts(&qemu_object_opts
);
689 qemu_add_opts(&qemu_trace_opts
);
690 qemu_init_exec_dir(argv
[0]);
692 while ((ch
= getopt_long(argc
, argv
, sopt
, lopt
, &opt_ind
)) != -1) {
695 flags
|= BDRV_O_SNAPSHOT
;
698 optarg
= (char *) "none";
700 case QEMU_NBD_OPT_CACHE
:
702 error_report("-n and --cache can only be specified once");
706 if (bdrv_parse_cache_mode(optarg
, &flags
, &writethrough
) == -1) {
707 error_report("Invalid cache mode `%s'", optarg
);
711 case QEMU_NBD_OPT_AIO
:
713 error_report("--aio can only be specified once");
717 if (!strcmp(optarg
, "native")) {
718 flags
|= BDRV_O_NATIVE_AIO
;
719 } else if (!strcmp(optarg
, "threads")) {
720 /* this is the default */
722 error_report("invalid aio mode `%s'", optarg
);
726 case QEMU_NBD_OPT_DISCARD
:
728 error_report("--discard can only be specified once");
732 if (bdrv_parse_discard_flags(optarg
, &flags
) == -1) {
733 error_report("Invalid discard mode `%s'", optarg
);
737 case QEMU_NBD_OPT_DETECT_ZEROES
:
739 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup
,
741 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
,
744 error_reportf_err(local_err
,
745 "Failed to parse detect_zeroes mode: ");
748 if (detect_zeroes
== BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP
&&
749 !(flags
& BDRV_O_UNMAP
)) {
750 error_report("setting detect-zeroes to unmap is not allowed "
751 "without setting discard operation to unmap");
762 if (qemu_strtou64(optarg
, NULL
, 0, &dev_offset
) < 0) {
763 error_report("Invalid offset '%s'", optarg
);
768 if (strstart(optarg
, SNAPSHOT_OPT_BASE
, NULL
)) {
769 sn_opts
= qemu_opts_parse_noisily(&internal_snapshot_opts
,
772 error_report("Failed in parsing snapshot param `%s'",
777 sn_id_or_name
= optarg
;
781 nbdflags
|= NBD_FLAG_READ_ONLY
;
782 flags
&= ~BDRV_O_RDWR
;
785 warn_report("The '-P' option is deprecated; use --image-opts with "
786 "a raw device wrapper for subset exports instead");
787 if (qemu_strtoi(optarg
, NULL
, 0, &partition
) < 0 ||
788 partition
< 1 || partition
> 8) {
789 error_report("Invalid partition '%s'", optarg
);
798 if (sockpath
[0] != '/') {
799 error_report("socket path must be absolute");
810 if (qemu_strtoi(optarg
, NULL
, 0, &shared
) < 0 ||
812 error_report("Invalid shared device number '%s'", optarg
);
823 export_name
= optarg
;
826 export_description
= optarg
;
840 error_report("Try `%s --help' for more information.", argv
[0]);
842 case QEMU_NBD_OPT_OBJECT
: {
844 opts
= qemu_opts_parse_noisily(&qemu_object_opts
,
850 case QEMU_NBD_OPT_TLSCREDS
:
853 case QEMU_NBD_OPT_IMAGE_OPTS
:
858 trace_file
= trace_opt_parse(optarg
);
860 case QEMU_NBD_OPT_TLSAUTHZ
:
863 case QEMU_NBD_OPT_FORK
:
873 if (argc
!= optind
) {
874 error_report("List mode is incompatible with a file name");
877 if (export_name
|| export_description
|| dev_offset
|| partition
||
878 device
|| disconnect
|| fmt
|| sn_id_or_name
|| bitmap
||
879 seen_aio
|| seen_discard
|| seen_cache
) {
880 error_report("List mode is incompatible with per-device settings");
884 error_report("List mode is incompatible with forking");
887 } else if ((argc
- optind
) != 1) {
888 error_report("Invalid number of arguments");
889 error_printf("Try `%s --help' for more information.\n", argv
[0]);
891 } else if (!export_name
) {
895 qemu_opts_foreach(&qemu_object_opts
,
896 user_creatable_add_opts_foreach
,
899 if (!trace_init_backends()) {
902 trace_init_file(trace_file
);
903 qemu_set_log(LOG_TRACE
);
905 socket_activation
= check_socket_activation();
906 if (socket_activation
== 0) {
907 setup_address_and_port(&bindto
, &port
);
909 /* Using socket activation - check user didn't use -p etc. */
910 const char *err_msg
= socket_activation_validate_opts(device
, sockpath
,
913 if (err_msg
!= NULL
) {
914 error_report("%s", err_msg
);
918 /* qemu-nbd can only listen on a single socket. */
919 if (socket_activation
> 1) {
920 error_report("qemu-nbd does not support socket activation with %s > 1",
928 error_report("TLS is only supported with IPv4/IPv6");
932 error_report("TLS is not supported with a host device");
935 if (tlsauthz
&& list
) {
936 error_report("TLS authorization is incompatible with export list");
939 tlscreds
= nbd_get_tls_creds(tlscredsid
, list
, &local_err
);
941 error_report("Failed to get TLS creds %s",
942 error_get_pretty(local_err
));
947 error_report("--tls-authz is not permitted without --tls-creds");
953 saddr
= nbd_build_socket_address(sockpath
, bindto
, port
);
954 return qemu_nbd_client_list(saddr
, tlscreds
, bindto
);
958 if (disconnect
|| device
) {
959 error_report("Kernel /dev/nbdN support not available");
962 #else /* HAVE_NBD_DEVICE */
964 int nbdfd
= open(argv
[optind
], O_RDWR
);
966 error_report("Cannot open %s: %s", argv
[optind
],
970 nbd_disconnect(nbdfd
);
974 printf("%s disconnected\n", argv
[optind
]);
980 if ((device
&& !verbose
) || fork_process
) {
985 if (qemu_pipe(stderr_fd
) < 0) {
986 error_report("Error setting up communication pipe: %s",
991 /* Now daemonize, but keep a communication channel open to
992 * print errors and exit with the proper status code.
996 error_report("Failed to fork: %s", strerror(errno
));
998 } else if (pid
== 0) {
1000 ret
= qemu_daemon(1, 0);
1002 /* Temporarily redirect stderr to the parent's pipe... */
1003 old_stderr
= dup(STDERR_FILENO
);
1004 dup2(stderr_fd
[1], STDERR_FILENO
);
1006 error_report("Failed to daemonize: %s", strerror(errno
));
1010 /* ... close the descriptor we inherited and go on. */
1011 close(stderr_fd
[1]);
1013 bool errors
= false;
1016 /* In the parent. Print error messages from the child until
1017 * it closes the pipe.
1019 close(stderr_fd
[1]);
1020 buf
= g_malloc(1024);
1021 while ((ret
= read(stderr_fd
[0], buf
, 1024)) > 0) {
1023 ret
= qemu_write_full(STDERR_FILENO
, buf
, ret
);
1029 error_report("Cannot read from daemon: %s",
1034 /* Usually the daemon should not print any message.
1035 * Exit with zero status in that case.
1041 if (device
!= NULL
&& sockpath
== NULL
) {
1042 sockpath
= g_malloc(128);
1043 snprintf(sockpath
, 128, SOCKET_PATH
, basename(device
));
1046 server
= qio_net_listener_new();
1047 if (socket_activation
== 0) {
1048 saddr
= nbd_build_socket_address(sockpath
, bindto
, port
);
1049 if (qio_net_listener_open_sync(server
, saddr
, &local_err
) < 0) {
1050 object_unref(OBJECT(server
));
1051 error_report_err(local_err
);
1056 /* See comment in check_socket_activation above. */
1057 for (i
= 0; i
< socket_activation
; i
++) {
1058 QIOChannelSocket
*sioc
;
1059 sioc
= qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD
+ i
,
1062 object_unref(OBJECT(server
));
1063 error_report("Failed to use socket activation: %s",
1064 error_get_pretty(local_err
));
1067 qio_net_listener_add(server
, sioc
);
1068 object_unref(OBJECT(sioc
));
1072 if (qemu_init_main_loop(&local_err
)) {
1073 error_report_err(local_err
);
1077 atexit(qemu_nbd_shutdown
);
1079 srcpath
= argv
[optind
];
1083 error_report("--image-opts and -f are mutually exclusive");
1086 opts
= qemu_opts_parse_noisily(&file_opts
, srcpath
, true);
1088 qemu_opts_reset(&file_opts
);
1091 options
= qemu_opts_to_qdict(opts
, NULL
);
1092 qemu_opts_reset(&file_opts
);
1093 blk
= blk_new_open(NULL
, NULL
, options
, flags
, &local_err
);
1096 options
= qdict_new();
1097 qdict_put_str(options
, "driver", fmt
);
1099 blk
= blk_new_open(srcpath
, NULL
, options
, flags
, &local_err
);
1103 error_reportf_err(local_err
, "Failed to blk_new_open '%s': ",
1109 blk_set_enable_write_cache(blk
, !writethrough
);
1112 ret
= bdrv_snapshot_load_tmp(bs
,
1113 qemu_opt_get(sn_opts
, SNAPSHOT_OPT_ID
),
1114 qemu_opt_get(sn_opts
, SNAPSHOT_OPT_NAME
),
1116 } else if (sn_id_or_name
) {
1117 ret
= bdrv_snapshot_load_tmp_by_id_or_name(bs
, sn_id_or_name
,
1121 error_reportf_err(local_err
, "Failed to load snapshot: ");
1125 bs
->detect_zeroes
= detect_zeroes
;
1126 fd_size
= blk_getlength(blk
);
1128 error_report("Failed to determine the image length: %s",
1129 strerror(-fd_size
));
1133 if (dev_offset
>= fd_size
) {
1134 error_report("Offset (%" PRIu64
") has to be smaller than the image "
1135 "size (%" PRId64
")", dev_offset
, fd_size
);
1138 fd_size
-= dev_offset
;
1144 error_report("Cannot request partition and offset together");
1147 ret
= find_partition(blk
, partition
, &dev_offset
, &limit
);
1149 error_report("Could not find partition %d: %s", partition
,
1154 * MBR partition limits are (32-bit << 9); this assert lets
1155 * the compiler know that we can't overflow 64 bits.
1157 assert(dev_offset
+ limit
>= dev_offset
);
1158 if (dev_offset
+ limit
> fd_size
) {
1159 error_report("Discovered partition %d at offset %" PRIu64
1160 " size %" PRIu64
", but size exceeds file length %"
1161 PRId64
, partition
, dev_offset
, limit
, fd_size
);
1167 export
= nbd_export_new(bs
, dev_offset
, fd_size
, export_name
,
1168 export_description
, bitmap
, nbdflags
,
1169 nbd_export_closed
, writethrough
, NULL
,
1176 ret
= pthread_create(&client_thread
, NULL
, nbd_client_thread
, device
);
1178 error_report("Failed to create client thread: %s", strerror(ret
));
1183 /* Shut up GCC warnings. */
1184 memset(&client_thread
, 0, sizeof(client_thread
));
1187 nbd_update_server_watch();
1189 /* now when the initialization is (almost) complete, chdir("/")
1190 * to free any busy filesystems */
1191 if (chdir("/") < 0) {
1192 error_report("Could not chdir to root directory: %s",
1198 dup2(old_stderr
, STDERR_FILENO
);
1204 main_loop_wait(false);
1205 if (state
== TERMINATE
) {
1206 state
= TERMINATING
;
1207 nbd_export_close(export
);
1208 nbd_export_put(export
);
1211 } while (state
!= TERMINATED
);
1218 qemu_opts_del(sn_opts
);
1222 pthread_join(client_thread
, &ret
);