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"
20 #include "qapi/error.h"
21 #include "qemu-common.h"
22 #include "qemu/cutils.h"
23 #include "sysemu/block-backend.h"
24 #include "block/block_int.h"
25 #include "block/nbd.h"
26 #include "qemu/main-loop.h"
27 #include "qemu/error-report.h"
28 #include "qemu/config-file.h"
29 #include "qemu/bswap.h"
31 #include "qemu/systemd.h"
32 #include "block/snapshot.h"
33 #include "qapi/util.h"
34 #include "qapi/qmp/qstring.h"
35 #include "qom/object_interfaces.h"
36 #include "io/channel-socket.h"
37 #include "crypto/init.h"
38 #include "trace/control.h"
44 #define SOCKET_PATH "/var/lock/qemu-nbd-%s"
45 #define QEMU_NBD_OPT_CACHE 256
46 #define QEMU_NBD_OPT_AIO 257
47 #define QEMU_NBD_OPT_DISCARD 258
48 #define QEMU_NBD_OPT_DETECT_ZEROES 259
49 #define QEMU_NBD_OPT_OBJECT 260
50 #define QEMU_NBD_OPT_TLSCREDS 261
51 #define QEMU_NBD_OPT_IMAGE_OPTS 262
52 #define QEMU_NBD_OPT_FORK 263
56 static NBDExport
*exp
;
60 static SocketAddress
*saddr
;
61 static int persistent
= 0;
62 static enum { RUNNING
, TERMINATE
, TERMINATING
, TERMINATED
} state
;
63 static int shared
= 1;
65 static QIOChannelSocket
*server_ioc
;
66 static int server_watch
= -1;
67 static QCryptoTLSCreds
*tlscreds
;
69 static void usage(const char *name
)
72 "Usage: %s [OPTIONS] FILE\n"
73 "QEMU Disk Network Block Device Server\n"
75 " -h, --help display this help and exit\n"
76 " -V, --version output version information and exit\n"
78 "Connection properties:\n"
79 " -p, --port=PORT port to listen on (default `%d')\n"
80 " -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
81 " -k, --socket=PATH path to the unix socket\n"
82 " (default '"SOCKET_PATH
"')\n"
83 " -e, --shared=NUM device can be shared by NUM clients (default '1')\n"
84 " -t, --persistent don't exit on the last connection\n"
85 " -v, --verbose display extra debugging information\n"
86 " -x, --export-name=NAME expose export by name\n"
87 " -D, --description=TEXT with -x, also export a human-readable description\n"
89 "Exposing part of the image:\n"
90 " -o, --offset=OFFSET offset into the image\n"
91 " -P, --partition=NUM only expose partition NUM\n"
93 "General purpose options:\n"
94 " --object type,id=ID,... define an object such as 'secret' for providing\n"
95 " passwords and/or encryption keys\n"
96 " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
97 " specify tracing options\n"
98 " --fork fork off the server process and exit the parent\n"
99 " once the server is running\n"
101 "Kernel NBD client support:\n"
102 " -c, --connect=DEV connect FILE to the local NBD device DEV\n"
103 " -d, --disconnect disconnect the specified device\n"
107 "Block device options:\n"
108 " -f, --format=FORMAT set image format (raw, qcow2, ...)\n"
109 " -r, --read-only export read-only\n"
110 " -s, --snapshot use FILE as an external snapshot, create a temporary\n"
111 " file with backing_file=FILE, redirect the write to\n"
112 " the temporary one\n"
113 " -l, --load-snapshot=SNAPSHOT_PARAM\n"
114 " load an internal snapshot inside FILE and export it\n"
115 " as an read-only device, SNAPSHOT_PARAM format is\n"
116 " 'snapshot.id=[ID],snapshot.name=[NAME]', or\n"
118 " -n, --nocache disable host cache\n"
119 " --cache=MODE set cache mode (none, writeback, ...)\n"
120 " --aio=MODE set AIO mode (native or threads)\n"
121 " --discard=MODE set discard mode (ignore, unmap)\n"
122 " --detect-zeroes=MODE set detect-zeroes mode (off, on, unmap)\n"
123 " --image-opts treat FILE as a full set of image options\n"
125 "Report bugs to <qemu-devel@nongnu.org>\n"
126 , name
, NBD_DEFAULT_PORT
, "DEVICE");
129 static void version(const char *name
)
133 "Written by Anthony Liguori.\n"
135 "Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n"
136 "This is free software; see the source for copying conditions. There is NO\n"
137 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
141 struct partition_record
145 uint32_t start_cylinder
;
146 uint8_t start_sector
;
149 uint8_t end_cylinder
;
151 uint32_t start_sector_abs
;
152 uint32_t nb_sectors_abs
;
155 static void read_partition(uint8_t *p
, struct partition_record
*r
)
158 r
->start_head
= p
[1];
159 r
->start_cylinder
= p
[3] | ((p
[2] << 2) & 0x0300);
160 r
->start_sector
= p
[2] & 0x3f;
163 r
->end_cylinder
= p
[7] | ((p
[6] << 2) & 0x300);
164 r
->end_sector
= p
[6] & 0x3f;
166 r
->start_sector_abs
= ldl_le_p(p
+ 8);
167 r
->nb_sectors_abs
= ldl_le_p(p
+ 12);
170 static int find_partition(BlockBackend
*blk
, int partition
,
171 off_t
*offset
, off_t
*size
)
173 struct partition_record mbr
[4];
174 uint8_t data
[MBR_SIZE
];
179 ret
= blk_pread(blk
, 0, data
, sizeof(data
));
181 error_report("error while reading: %s", strerror(-ret
));
185 if (data
[510] != 0x55 || data
[511] != 0xaa) {
189 for (i
= 0; i
< 4; i
++) {
190 read_partition(&data
[446 + 16 * i
], &mbr
[i
]);
192 if (!mbr
[i
].system
|| !mbr
[i
].nb_sectors_abs
) {
196 if (mbr
[i
].system
== 0xF || mbr
[i
].system
== 0x5) {
197 struct partition_record ext
[4];
198 uint8_t data1
[MBR_SIZE
];
201 ret
= blk_pread(blk
, mbr
[i
].start_sector_abs
* MBR_SIZE
,
202 data1
, sizeof(data1
));
204 error_report("error while reading: %s", strerror(-ret
));
208 for (j
= 0; j
< 4; j
++) {
209 read_partition(&data1
[446 + 16 * j
], &ext
[j
]);
210 if (!ext
[j
].system
|| !ext
[j
].nb_sectors_abs
) {
214 if ((ext_partnum
+ j
+ 1) == partition
) {
215 *offset
= (uint64_t)ext
[j
].start_sector_abs
<< 9;
216 *size
= (uint64_t)ext
[j
].nb_sectors_abs
<< 9;
221 } else if ((i
+ 1) == partition
) {
222 *offset
= (uint64_t)mbr
[i
].start_sector_abs
<< 9;
223 *size
= (uint64_t)mbr
[i
].nb_sectors_abs
<< 9;
231 static void termsig_handler(int signum
)
233 atomic_cmpxchg(&state
, RUNNING
, TERMINATE
);
238 static void *show_parts(void *arg
)
243 /* linux just needs an open() to trigger
244 * the partition table update
245 * but remember to load the module with max_part != 0 :
246 * modprobe nbd max_part=63
248 nbd
= open(device
, O_RDWR
);
255 static void *nbd_client_thread(void *arg
)
260 QIOChannelSocket
*sioc
;
263 pthread_t show_parts_thread
;
264 Error
*local_error
= NULL
;
266 sioc
= qio_channel_socket_new();
267 if (qio_channel_socket_connect_sync(sioc
,
270 error_report_err(local_error
);
274 ret
= nbd_receive_negotiate(QIO_CHANNEL(sioc
), NULL
, &nbdflags
,
276 &size
, &local_error
);
279 error_report_err(local_error
);
284 fd
= open(device
, O_RDWR
);
286 /* Linux-only, we can use %m in printf. */
287 error_report("Failed to open %s: %m", device
);
291 ret
= nbd_init(fd
, sioc
, nbdflags
, size
);
296 /* update partition table */
297 pthread_create(&show_parts_thread
, NULL
, show_parts
, device
);
300 fprintf(stderr
, "NBD device %s is now connected to %s\n",
303 /* Close stderr so that the qemu-nbd process exits. */
304 dup2(STDOUT_FILENO
, STDERR_FILENO
);
307 ret
= nbd_client(fd
);
312 object_unref(OBJECT(sioc
));
313 kill(getpid(), SIGTERM
);
314 return (void *) EXIT_SUCCESS
;
319 object_unref(OBJECT(sioc
));
321 kill(getpid(), SIGTERM
);
322 return (void *) EXIT_FAILURE
;
325 static int nbd_can_accept(void)
327 return nb_fds
< shared
;
330 static void nbd_export_closed(NBDExport
*exp
)
332 assert(state
== TERMINATING
);
336 static void nbd_update_server_watch(void);
338 static void nbd_client_closed(NBDClient
*client
)
341 if (nb_fds
== 0 && !persistent
&& state
== RUNNING
) {
344 nbd_update_server_watch();
345 nbd_client_put(client
);
348 static gboolean
nbd_accept(QIOChannel
*ioc
, GIOCondition cond
, gpointer opaque
)
350 QIOChannelSocket
*cioc
;
352 cioc
= qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc
),
358 if (state
>= TERMINATE
) {
359 object_unref(OBJECT(cioc
));
364 nbd_update_server_watch();
365 nbd_client_new(newproto
? NULL
: exp
, cioc
,
366 tlscreds
, NULL
, nbd_client_closed
);
367 object_unref(OBJECT(cioc
));
372 static void nbd_update_server_watch(void)
374 if (nbd_can_accept()) {
375 if (server_watch
== -1) {
376 server_watch
= qio_channel_add_watch(QIO_CHANNEL(server_ioc
),
382 if (server_watch
!= -1) {
383 g_source_remove(server_watch
);
390 static SocketAddress
*nbd_build_socket_address(const char *sockpath
,
394 SocketAddress
*saddr
;
396 saddr
= g_new0(SocketAddress
, 1);
398 saddr
->type
= SOCKET_ADDRESS_KIND_UNIX
;
399 saddr
->u
.q_unix
.data
= g_new0(UnixSocketAddress
, 1);
400 saddr
->u
.q_unix
.data
->path
= g_strdup(sockpath
);
402 InetSocketAddress
*inet
;
403 saddr
->type
= SOCKET_ADDRESS_KIND_INET
;
404 inet
= saddr
->u
.inet
.data
= g_new0(InetSocketAddress
, 1);
405 inet
->host
= g_strdup(bindto
);
407 inet
->port
= g_strdup(port
);
409 inet
->port
= g_strdup_printf("%d", NBD_DEFAULT_PORT
);
417 static QemuOptsList file_opts
= {
419 .implied_opt_name
= "file",
420 .head
= QTAILQ_HEAD_INITIALIZER(file_opts
.head
),
422 /* no elements => accept any params */
423 { /* end of list */ }
427 static QemuOptsList qemu_object_opts
= {
429 .implied_opt_name
= "qom-type",
430 .head
= QTAILQ_HEAD_INITIALIZER(qemu_object_opts
.head
),
438 static QCryptoTLSCreds
*nbd_get_tls_creds(const char *id
, Error
**errp
)
441 QCryptoTLSCreds
*creds
;
443 obj
= object_resolve_path_component(
444 object_get_objects_root(), id
);
446 error_setg(errp
, "No TLS credentials with id '%s'",
450 creds
= (QCryptoTLSCreds
*)
451 object_dynamic_cast(obj
, TYPE_QCRYPTO_TLS_CREDS
);
453 error_setg(errp
, "Object with id '%s' is not TLS credentials",
458 if (creds
->endpoint
!= QCRYPTO_TLS_CREDS_ENDPOINT_SERVER
) {
460 "Expecting TLS credentials with a server endpoint");
467 static void setup_address_and_port(const char **address
, const char **port
)
469 if (*address
== NULL
) {
470 *address
= "0.0.0.0";
474 *port
= stringify(NBD_DEFAULT_PORT
);
479 * Check socket parameters compatibility when socket activation is used.
481 static const char *socket_activation_validate_opts(const char *device
,
482 const char *sockpath
,
486 if (device
!= NULL
) {
487 return "NBD device can't be set when using socket activation";
490 if (sockpath
!= NULL
) {
491 return "Unix socket can't be set when using socket activation";
494 if (address
!= NULL
) {
495 return "The interface can't be set when using socket activation";
499 return "TCP port number can't be set when using socket activation";
505 int main(int argc
, char **argv
)
508 BlockDriverState
*bs
;
509 off_t dev_offset
= 0;
510 uint16_t nbdflags
= 0;
511 bool disconnect
= false;
512 const char *bindto
= NULL
;
513 const char *port
= NULL
;
514 char *sockpath
= NULL
;
517 QemuOpts
*sn_opts
= NULL
;
518 const char *sn_id_or_name
= NULL
;
519 const char *sopt
= "hVb:o:p:rsnP:c:dvk:e:f:tl:x:T:D:";
520 struct option lopt
[] = {
521 { "help", no_argument
, NULL
, 'h' },
522 { "version", no_argument
, NULL
, 'V' },
523 { "bind", required_argument
, NULL
, 'b' },
524 { "port", required_argument
, NULL
, 'p' },
525 { "socket", required_argument
, NULL
, 'k' },
526 { "offset", required_argument
, NULL
, 'o' },
527 { "read-only", no_argument
, NULL
, 'r' },
528 { "partition", required_argument
, NULL
, 'P' },
529 { "connect", required_argument
, NULL
, 'c' },
530 { "disconnect", no_argument
, NULL
, 'd' },
531 { "snapshot", no_argument
, NULL
, 's' },
532 { "load-snapshot", required_argument
, NULL
, 'l' },
533 { "nocache", no_argument
, NULL
, 'n' },
534 { "cache", required_argument
, NULL
, QEMU_NBD_OPT_CACHE
},
535 { "aio", required_argument
, NULL
, QEMU_NBD_OPT_AIO
},
536 { "discard", required_argument
, NULL
, QEMU_NBD_OPT_DISCARD
},
537 { "detect-zeroes", required_argument
, NULL
,
538 QEMU_NBD_OPT_DETECT_ZEROES
},
539 { "shared", required_argument
, NULL
, 'e' },
540 { "format", required_argument
, NULL
, 'f' },
541 { "persistent", no_argument
, NULL
, 't' },
542 { "verbose", no_argument
, NULL
, 'v' },
543 { "object", required_argument
, NULL
, QEMU_NBD_OPT_OBJECT
},
544 { "export-name", required_argument
, NULL
, 'x' },
545 { "description", required_argument
, NULL
, 'D' },
546 { "tls-creds", required_argument
, NULL
, QEMU_NBD_OPT_TLSCREDS
},
547 { "image-opts", no_argument
, NULL
, QEMU_NBD_OPT_IMAGE_OPTS
},
548 { "trace", required_argument
, NULL
, 'T' },
549 { "fork", no_argument
, NULL
, QEMU_NBD_OPT_FORK
},
555 int flags
= BDRV_O_RDWR
;
558 bool seen_cache
= false;
559 bool seen_discard
= false;
560 bool seen_aio
= false;
561 pthread_t client_thread
;
562 const char *fmt
= NULL
;
563 Error
*local_err
= NULL
;
564 BlockdevDetectZeroesOptions detect_zeroes
= BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
;
565 QDict
*options
= NULL
;
566 const char *export_name
= NULL
;
567 const char *export_description
= NULL
;
568 const char *tlscredsid
= NULL
;
569 bool imageOpts
= false;
570 bool writethrough
= true;
571 char *trace_file
= NULL
;
572 bool fork_process
= false;
574 unsigned socket_activation
;
576 /* The client thread uses SIGTERM to interrupt the server. A signal
577 * handler ensures that "qemu-nbd -v -c" exits with a nice status code.
579 struct sigaction sa_sigterm
;
580 memset(&sa_sigterm
, 0, sizeof(sa_sigterm
));
581 sa_sigterm
.sa_handler
= termsig_handler
;
582 sigaction(SIGTERM
, &sa_sigterm
, NULL
);
584 module_call_init(MODULE_INIT_TRACE
);
585 qcrypto_init(&error_fatal
);
587 module_call_init(MODULE_INIT_QOM
);
588 qemu_add_opts(&qemu_object_opts
);
589 qemu_add_opts(&qemu_trace_opts
);
590 qemu_init_exec_dir(argv
[0]);
592 while ((ch
= getopt_long(argc
, argv
, sopt
, lopt
, &opt_ind
)) != -1) {
595 flags
|= BDRV_O_SNAPSHOT
;
598 optarg
= (char *) "none";
600 case QEMU_NBD_OPT_CACHE
:
602 error_report("-n and --cache can only be specified once");
606 if (bdrv_parse_cache_mode(optarg
, &flags
, &writethrough
) == -1) {
607 error_report("Invalid cache mode `%s'", optarg
);
611 case QEMU_NBD_OPT_AIO
:
613 error_report("--aio can only be specified once");
617 if (!strcmp(optarg
, "native")) {
618 flags
|= BDRV_O_NATIVE_AIO
;
619 } else if (!strcmp(optarg
, "threads")) {
620 /* this is the default */
622 error_report("invalid aio mode `%s'", optarg
);
626 case QEMU_NBD_OPT_DISCARD
:
628 error_report("--discard can only be specified once");
632 if (bdrv_parse_discard_flags(optarg
, &flags
) == -1) {
633 error_report("Invalid discard mode `%s'", optarg
);
637 case QEMU_NBD_OPT_DETECT_ZEROES
:
639 qapi_enum_parse(BlockdevDetectZeroesOptions_lookup
,
641 BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX
,
642 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF
,
645 error_reportf_err(local_err
,
646 "Failed to parse detect_zeroes mode: ");
649 if (detect_zeroes
== BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP
&&
650 !(flags
& BDRV_O_UNMAP
)) {
651 error_report("setting detect-zeroes to unmap is not allowed "
652 "without setting discard operation to unmap");
663 dev_offset
= strtoll (optarg
, &end
, 0);
665 error_report("Invalid offset `%s'", optarg
);
668 if (dev_offset
< 0) {
669 error_report("Offset must be positive `%s'", optarg
);
674 if (strstart(optarg
, SNAPSHOT_OPT_BASE
, NULL
)) {
675 sn_opts
= qemu_opts_parse_noisily(&internal_snapshot_opts
,
678 error_report("Failed in parsing snapshot param `%s'",
683 sn_id_or_name
= optarg
;
687 nbdflags
|= NBD_FLAG_READ_ONLY
;
688 flags
&= ~BDRV_O_RDWR
;
691 partition
= strtol(optarg
, &end
, 0);
693 error_report("Invalid partition `%s'", optarg
);
696 if (partition
< 1 || partition
> 8) {
697 error_report("Invalid partition %d", partition
);
703 if (sockpath
[0] != '/') {
704 error_report("socket path must be absolute");
715 shared
= strtol(optarg
, &end
, 0);
717 error_report("Invalid shared device number '%s'", optarg
);
721 error_report("Shared device number must be greater than 0");
732 export_name
= optarg
;
735 export_description
= optarg
;
749 error_report("Try `%s --help' for more information.", argv
[0]);
751 case QEMU_NBD_OPT_OBJECT
: {
753 opts
= qemu_opts_parse_noisily(&qemu_object_opts
,
759 case QEMU_NBD_OPT_TLSCREDS
:
762 case QEMU_NBD_OPT_IMAGE_OPTS
:
767 trace_file
= trace_opt_parse(optarg
);
769 case QEMU_NBD_OPT_FORK
:
775 if ((argc
- optind
) != 1) {
776 error_report("Invalid number of arguments");
777 error_printf("Try `%s --help' for more information.\n", argv
[0]);
781 if (qemu_opts_foreach(&qemu_object_opts
,
782 user_creatable_add_opts_foreach
,
787 if (!trace_init_backends()) {
790 trace_init_file(trace_file
);
791 qemu_set_log(LOG_TRACE
);
793 socket_activation
= check_socket_activation();
794 if (socket_activation
== 0) {
795 setup_address_and_port(&bindto
, &port
);
797 /* Using socket activation - check user didn't use -p etc. */
798 const char *err_msg
= socket_activation_validate_opts(device
, sockpath
,
800 if (err_msg
!= NULL
) {
801 error_report("%s", err_msg
);
805 /* qemu-nbd can only listen on a single socket. */
806 if (socket_activation
> 1) {
807 error_report("qemu-nbd does not support socket activation with %s > 1",
815 error_report("TLS is only supported with IPv4/IPv6");
819 error_report("TLS is not supported with a host device");
823 /* Set the default NBD protocol export name, since
824 * we *must* use new style protocol for TLS */
827 tlscreds
= nbd_get_tls_creds(tlscredsid
, &local_err
);
829 error_report("Failed to get TLS creds %s",
830 error_get_pretty(local_err
));
836 int nbdfd
= open(argv
[optind
], O_RDWR
);
838 error_report("Cannot open %s: %s", argv
[optind
],
842 nbd_disconnect(nbdfd
);
846 printf("%s disconnected\n", argv
[optind
]);
851 if ((device
&& !verbose
) || fork_process
) {
856 if (qemu_pipe(stderr_fd
) < 0) {
857 error_report("Error setting up communication pipe: %s",
862 /* Now daemonize, but keep a communication channel open to
863 * print errors and exit with the proper status code.
867 error_report("Failed to fork: %s", strerror(errno
));
869 } else if (pid
== 0) {
871 ret
= qemu_daemon(1, 0);
873 /* Temporarily redirect stderr to the parent's pipe... */
874 old_stderr
= dup(STDERR_FILENO
);
875 dup2(stderr_fd
[1], STDERR_FILENO
);
877 error_report("Failed to daemonize: %s", strerror(errno
));
881 /* ... close the descriptor we inherited and go on. */
887 /* In the parent. Print error messages from the child until
888 * it closes the pipe.
891 buf
= g_malloc(1024);
892 while ((ret
= read(stderr_fd
[0], buf
, 1024)) > 0) {
894 ret
= qemu_write_full(STDERR_FILENO
, buf
, ret
);
900 error_report("Cannot read from daemon: %s",
905 /* Usually the daemon should not print any message.
906 * Exit with zero status in that case.
912 if (device
!= NULL
&& sockpath
== NULL
) {
913 sockpath
= g_malloc(128);
914 snprintf(sockpath
, 128, SOCKET_PATH
, basename(device
));
917 if (socket_activation
== 0) {
918 server_ioc
= qio_channel_socket_new();
919 saddr
= nbd_build_socket_address(sockpath
, bindto
, port
);
920 if (qio_channel_socket_listen_sync(server_ioc
, saddr
, &local_err
) < 0) {
921 object_unref(OBJECT(server_ioc
));
922 error_report_err(local_err
);
926 /* See comment in check_socket_activation above. */
927 assert(socket_activation
== 1);
928 server_ioc
= qio_channel_socket_new_fd(FIRST_SOCKET_ACTIVATION_FD
,
930 if (server_ioc
== NULL
) {
931 error_report("Failed to use socket activation: %s",
932 error_get_pretty(local_err
));
937 if (qemu_init_main_loop(&local_err
)) {
938 error_report_err(local_err
);
942 atexit(bdrv_close_all
);
944 srcpath
= argv
[optind
];
948 error_report("--image-opts and -f are mutually exclusive");
951 opts
= qemu_opts_parse_noisily(&file_opts
, srcpath
, true);
953 qemu_opts_reset(&file_opts
);
956 options
= qemu_opts_to_qdict(opts
, NULL
);
957 qemu_opts_reset(&file_opts
);
958 blk
= blk_new_open(NULL
, NULL
, options
, flags
, &local_err
);
961 options
= qdict_new();
962 qdict_put(options
, "driver", qstring_from_str(fmt
));
964 blk
= blk_new_open(srcpath
, NULL
, options
, flags
, &local_err
);
968 error_reportf_err(local_err
, "Failed to blk_new_open '%s': ",
974 blk_set_enable_write_cache(blk
, !writethrough
);
977 ret
= bdrv_snapshot_load_tmp(bs
,
978 qemu_opt_get(sn_opts
, SNAPSHOT_OPT_ID
),
979 qemu_opt_get(sn_opts
, SNAPSHOT_OPT_NAME
),
981 } else if (sn_id_or_name
) {
982 ret
= bdrv_snapshot_load_tmp_by_id_or_name(bs
, sn_id_or_name
,
986 error_reportf_err(local_err
, "Failed to load snapshot: ");
990 bs
->detect_zeroes
= detect_zeroes
;
991 fd_size
= blk_getlength(blk
);
993 error_report("Failed to determine the image length: %s",
998 if (dev_offset
>= fd_size
) {
999 error_report("Offset (%lld) has to be smaller than the image size "
1001 (long long int)dev_offset
, (long long int)fd_size
);
1004 fd_size
-= dev_offset
;
1006 if (partition
!= -1) {
1007 ret
= find_partition(blk
, partition
, &dev_offset
, &fd_size
);
1009 error_report("Could not find partition %d: %s", partition
,
1015 exp
= nbd_export_new(bs
, dev_offset
, fd_size
, nbdflags
, nbd_export_closed
,
1016 writethrough
, NULL
, &local_err
);
1018 error_report_err(local_err
);
1022 nbd_export_set_name(exp
, export_name
);
1023 nbd_export_set_description(exp
, export_description
);
1025 } else if (export_description
) {
1026 error_report("Export description requires an export name");
1033 ret
= pthread_create(&client_thread
, NULL
, nbd_client_thread
, device
);
1035 error_report("Failed to create client thread: %s", strerror(ret
));
1039 /* Shut up GCC warnings. */
1040 memset(&client_thread
, 0, sizeof(client_thread
));
1043 nbd_update_server_watch();
1045 /* now when the initialization is (almost) complete, chdir("/")
1046 * to free any busy filesystems */
1047 if (chdir("/") < 0) {
1048 error_report("Could not chdir to root directory: %s",
1054 dup2(old_stderr
, STDERR_FILENO
);
1060 main_loop_wait(false);
1061 if (state
== TERMINATE
) {
1062 state
= TERMINATING
;
1063 nbd_export_close(exp
);
1064 nbd_export_put(exp
);
1067 } while (state
!= TERMINATED
);
1074 qemu_opts_del(sn_opts
);
1078 pthread_join(client_thread
, &ret
);