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b1a75b3348
The NBD protocol allows servers to advertise a human-readable
description alongside an export name during NBD_OPT_LIST. Add
an option to pass through the user's string to the NBD client.
Doing this also makes it easier to test commit 200650d4, which
is the client counterpart of receiving the description.
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1476469998-28592-2-git-send-email-eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
123 lines
4.3 KiB
Plaintext
123 lines
4.3 KiB
Plaintext
@example
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@c man begin SYNOPSIS
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@command{qemu-nbd} [OPTION]... @var{filename}
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@command{qemu-nbd} @option{-d} @var{dev}
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@c man end
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@end example
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@c man begin DESCRIPTION
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Export a QEMU disk image using the NBD protocol.
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@c man end
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@c man begin OPTIONS
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@var{filename} is a disk image filename, or a set of block
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driver options if @var{--image-opts} is specified.
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@var{dev} is an NBD device.
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@table @option
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@item --object type,id=@var{id},...props...
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Define a new instance of the @var{type} object class identified by @var{id}.
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See the @code{qemu(1)} manual page for full details of the properties
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supported. The common object types that it makes sense to define are the
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@code{secret} object, which is used to supply passwords and/or encryption
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keys, and the @code{tls-creds} object, which is used to supply TLS
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credentials for the qemu-nbd server.
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@item -p, --port=@var{port}
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The TCP port to listen on (default @samp{10809})
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@item -o, --offset=@var{offset}
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The offset into the image
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@item -b, --bind=@var{iface}
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The interface to bind to (default @samp{0.0.0.0})
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@item -k, --socket=@var{path}
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Use a unix socket with path @var{path}
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@item --image-opts
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Treat @var{filename} as a set of image options, instead of a plain
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filename. If this flag is specified, the @var{-f} flag should
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not be used, instead the '@code{format=}' option should be set.
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@item -f, --format=@var{fmt}
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Force the use of the block driver for format @var{fmt} instead of
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auto-detecting
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@item -r, --read-only
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Export the disk as read-only
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@item -P, --partition=@var{num}
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Only expose partition @var{num}
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@item -s, --snapshot
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Use @var{filename} as an external snapshot, create a temporary
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file with backing_file=@var{filename}, redirect the write to
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the temporary one
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@item -l, --load-snapshot=@var{snapshot_param}
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Load an internal snapshot inside @var{filename} and export it
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as an read-only device, @var{snapshot_param} format is
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'snapshot.id=[ID],snapshot.name=[NAME]' or '[ID_OR_NAME]'
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@item -n, --nocache
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@itemx --cache=@var{cache}
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The cache mode to be used with the file. See the documentation of
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the emulator's @code{-drive cache=...} option for allowed values.
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@item --aio=@var{aio}
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Set the asynchronous I/O mode between @samp{threads} (the default)
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and @samp{native} (Linux only).
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@item --discard=@var{discard}
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Control whether @dfn{discard} (also known as @dfn{trim} or @dfn{unmap})
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requests are ignored or passed to the filesystem. @var{discard} is one of
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@samp{ignore} (or @samp{off}), @samp{unmap} (or @samp{on}). The default is
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@samp{ignore}.
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@item --detect-zeroes=@var{detect-zeroes}
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Control the automatic conversion of plain zero writes by the OS to
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driver-specific optimized zero write commands. @var{detect-zeroes} is one of
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@samp{off}, @samp{on} or @samp{unmap}. @samp{unmap}
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converts a zero write to an unmap operation and can only be used if
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@var{discard} is set to @samp{unmap}. The default is @samp{off}.
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@item -c, --connect=@var{dev}
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Connect @var{filename} to NBD device @var{dev}
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@item -d, --disconnect
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Disconnect the device @var{dev}
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@item -e, --shared=@var{num}
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Allow up to @var{num} clients to share the device (default @samp{1})
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@item -t, --persistent
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Don't exit on the last connection
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@item -x, --export-name=@var{name}
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Set the NBD volume export name. This switches the server to use
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the new style NBD protocol negotiation
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@item -D, --description=@var{description}
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Set the NBD volume export description, as a human-readable
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string. Requires the use of @option{-x}
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@item --tls-creds=ID
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Enable mandatory TLS encryption for the server by setting the ID
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of the TLS credentials object previously created with the --object
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option.
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@item --fork
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Fork off the server process and exit the parent once the server is running.
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@item -v, --verbose
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Display extra debugging information
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@item -h, --help
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Display this help and exit
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@item -V, --version
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Display version information and exit
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@item -T, --trace [[enable=]@var{pattern}][,events=@var{file}][,file=@var{file}]
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@findex --trace
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@include qemu-option-trace.texi
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@end table
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@c man end
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@ignore
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@setfilename qemu-nbd
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@settitle QEMU Disk Network Block Device Server
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@c man begin AUTHOR
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Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.
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This is free software; see the source for copying conditions. There is NO
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warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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@c man end
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@c man begin SEEALSO
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qemu(1), qemu-img(1)
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@c man end
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@end ignore
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