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-@example
-@c man begin SYNOPSIS
-@command{qemu-nbd} [OPTION]... @var{filename}
-
-@command{qemu-nbd} @option{-L} [OPTION]...
-
-@command{qemu-nbd} @option{-d} @var{dev}
-@c man end
-@end example
-
-@c man begin DESCRIPTION
-
-Export a QEMU disk image using the NBD protocol.
-
-Other uses:
-@itemize
-@item
-Bind a /dev/nbdX block device to a QEMU server (on Linux).
-@item
-As a client to query exports of a remote NBD server.
-@end itemize
-
-@c man end
-
-@c man begin OPTIONS
-@var{filename} is a disk image filename, or a set of block
-driver options if @option{--image-opts} is specified.
-
-@var{dev} is an NBD device.
-
-@table @option
-@item --object type,id=@var{id},...props...
-Define a new instance of the @var{type} object class identified by @var{id}.
-See the @code{qemu(1)} manual page for full details of the properties
-supported. The common object types that it makes sense to define are the
-@code{secret} object, which is used to supply passwords and/or encryption
-keys, and the @code{tls-creds} object, which is used to supply TLS
-credentials for the qemu-nbd server or client.
-@item -p, --port=@var{port}
-The TCP port to listen on as a server, or connect to as a client
-(default @samp{10809}).
-@item -o, --offset=@var{offset}
-The offset into the image.
-@item -b, --bind=@var{iface}
-The interface to bind to as a server, or connect to as a client
-(default @samp{0.0.0.0}).
-@item -k, --socket=@var{path}
-Use a unix socket with path @var{path}.
-@item --image-opts
-Treat @var{filename} as a set of image options, instead of a plain
-filename. If this flag is specified, the @var{-f} flag should
-not be used, instead the '@code{format=}' option should be set.
-@item -f, --format=@var{fmt}
-Force the use of the block driver for format @var{fmt} instead of
-auto-detecting.
-@item -r, --read-only
-Export the disk as read-only.
-@item -P, --partition=@var{num}
-Deprecated: Only expose MBR partition @var{num}.  Understands physical
-partitions 1-4 and logical partition 5. New code should instead use
-@option{--image-opts} with the raw driver wrapping a subset of the
-original image.
-@item -B, --bitmap=@var{name}
-If @var{filename} has a qcow2 persistent bitmap @var{name}, expose
-that bitmap via the ``qemu:dirty-bitmap:@var{name}'' context
-accessible through NBD_OPT_SET_META_CONTEXT.
-@item -s, --snapshot
-Use @var{filename} as an external snapshot, create a temporary
-file with backing_file=@var{filename}, redirect the write to
-the temporary one.
-@item -l, --load-snapshot=@var{snapshot_param}
-Load an internal snapshot inside @var{filename} and export it
-as an read-only device, @var{snapshot_param} format is
-'snapshot.id=[ID],snapshot.name=[NAME]' or '[ID_OR_NAME]'
-@item -n, --nocache
-@itemx --cache=@var{cache}
-The cache mode to be used with the file.  See the documentation of
-the emulator's @code{-drive cache=...} option for allowed values.
-@item --aio=@var{aio}
-Set the asynchronous I/O mode between @samp{threads} (the default)
-and @samp{native} (Linux only).
-@item --discard=@var{discard}
-Control whether @dfn{discard} (also known as @dfn{trim} or @dfn{unmap})
-requests are ignored or passed to the filesystem.  @var{discard} is one of
-@samp{ignore} (or @samp{off}), @samp{unmap} (or @samp{on}).  The default is
-@samp{ignore}.
-@item --detect-zeroes=@var{detect-zeroes}
-Control the automatic conversion of plain zero writes by the OS to
-driver-specific optimized zero write commands.  @var{detect-zeroes} is one of
-@samp{off}, @samp{on} or @samp{unmap}.  @samp{unmap}
-converts a zero write to an unmap operation and can only be used if
-@var{discard} is set to @samp{unmap}.  The default is @samp{off}.
-@item -c, --connect=@var{dev}
-Connect @var{filename} to NBD device @var{dev} (Linux only).
-@item -d, --disconnect
-Disconnect the device @var{dev} (Linux only).
-@item -e, --shared=@var{num}
-Allow up to @var{num} clients to share the device (default
-@samp{1}). Safe for readers, but for now, consistency is not
-guaranteed between multiple writers.
-@item -t, --persistent
-Don't exit on the last connection.
-@item -x, --export-name=@var{name}
-Set the NBD volume export name (default of a zero-length string).
-@item -D, --description=@var{description}
-Set the NBD volume export description, as a human-readable
-string.
-@item -L, --list
-Connect as a client and list all details about the exports exposed by
-a remote NBD server.  This enables list mode, and is incompatible
-with options that change behavior related to a specific export (such as
-@option{--export-name}, @option{--offset}, ...).
-@item --tls-creds=ID
-Enable mandatory TLS encryption for the server by setting the ID
-of the TLS credentials object previously created with the --object
-option; or provide the credentials needed for connecting as a client
-in list mode.
-@item --fork
-Fork off the server process and exit the parent once the server is running.
-@item --pid-file=PATH
-Store the server's process ID in the given file.
-@item --tls-authz=ID
-Specify the ID of a qauthz object previously created with the
---object option. This will be used to authorize connecting users
-against their x509 distinguished name.
-@item -v, --verbose
-Display extra debugging information.
-@item -h, --help
-Display this help and exit.
-@item -V, --version
-Display version information and exit.
-@item -T, --trace [[enable=]@var{pattern}][,events=@var{file}][,file=@var{file}]
-@findex --trace
-@include qemu-option-trace.texi
-@end table
-
-@c man end
-
-@c man begin EXAMPLES
-Start a server listening on port 10809 that exposes only the
-guest-visible contents of a qcow2 file, with no TLS encryption, and
-with the default export name (an empty string). The command is
-one-shot, and will block until the first successful client
-disconnects:
-
-@example
-qemu-nbd -f qcow2 file.qcow2
-@end example
-
-Start a long-running server listening with encryption on port 10810,
-and whitelist clients with a specific X.509 certificate to connect to
-a 1 megabyte subset of a raw file, using the export name 'subset':
-
-@example
-qemu-nbd \
-  --object tls-creds-x509,id=tls0,endpoint=server,dir=/path/to/qemutls \
-  --object 'authz-simple,id=auth0,identity=CN=laptop.example.com,,\
-            O=Example Org,,L=London,,ST=London,,C=GB' \
-  --tls-creds tls0 --tls-authz auth0 \
-  -t -x subset -p 10810 \
-  --image-opts driver=raw,offset=1M,size=1M,file.driver=file,file.filename=file.raw
-@end example
-
-Serve a read-only copy of just the first MBR partition of a guest
-image over a Unix socket with as many as 5 simultaneous readers, with
-a persistent process forked as a daemon:
-
-@example
-qemu-nbd --fork --persistent --shared=5 --socket=/path/to/sock \
-  --partition=1 --read-only --format=qcow2 file.qcow2
-@end example
-
-Expose the guest-visible contents of a qcow2 file via a block device
-/dev/nbd0 (and possibly creating /dev/nbd0p1 and friends for
-partitions found within), then disconnect the device when done.
-Access to bind qemu-nbd to an /dev/nbd device generally requires root
-privileges, and may also require the execution of @code{modprobe nbd}
-to enable the kernel NBD client module.  @emph{CAUTION}: Do not use
-this method to mount filesystems from an untrusted guest image - a
-malicious guest may have prepared the image to attempt to trigger
-kernel bugs in partition probing or file system mounting.
-
-@example
-qemu-nbd -c /dev/nbd0 -f qcow2 file.qcow2
-qemu-nbd -d /dev/nbd0
-@end example
-
-Query a remote server to see details about what export(s) it is
-serving on port 10809, and authenticating via PSK:
-
-@example
-qemu-nbd \
-  --object tls-creds-psk,id=tls0,dir=/tmp/keys,username=eblake,endpoint=client \
-  --tls-creds tls0 -L -b remote.example.com
-@end example
-
-@c man end
-
-@ignore
-
-@setfilename qemu-nbd
-@settitle QEMU Disk Network Block Device Server
-
-@c man begin AUTHOR
-Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.
-This is free software; see the source for copying conditions.  There is NO
-warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-@c man end
-
-@c man begin SEEALSO
-qemu(1), qemu-img(1)
-@c man end
-
-@end ignore