Support for Humusoft MF624 data acquisition card.

[lisovros/qemu_apohw.git] / qemu-nbd.texi

diff --git a/qemu-nbd.texi b/qemu-nbd.texi
index 6955d903271de24a2c52b544cacdb67183115aeb..46fd483eb8395ba48183145222b9c190a17d2607 100644 (file)
--- a/qemu-nbd.texi
+++ b/qemu-nbd.texi
@@ -15,27 +15,46 @@ Export QEMU disk image using NBD protocol.
 @item @var{filename}
  is a disk image filename
 @item -p, --port=@var{port}
-  port to listen on (default @samp{1024})
+  port to listen on (default @samp{10809})
 @item -o, --offset=@var{offset}
   offset into the image
 @item -b, --bind=@var{iface}
   interface to bind to (default @samp{0.0.0.0})
 @item -k, --socket=@var{path}
   Use a unix socket with path @var{path}
+@item -f, --format=@var{format}
+  Set image format as @var{format}
 @item -r, --read-only
   export read-only
 @item -P, --partition=@var{num}
   only expose partition @var{num}
 @item -s, --snapshot
-  use snapshot file
+  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
-  disable host cache
+@itemx --cache=@var{cache}
+  set 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}
+  choose asynchronous I/O mode between @samp{threads} (the default)
+  and @samp{native} (Linux only).
+@item --discard=@var{discard}
+  toggles whether @dfn{discard} (also known as @dfn{trim} or @dfn{unmap})
+  requests are ignored or passed to the filesystem.  The default is no
+  (@samp{--discard=ignore}).
 @item -c, --connect=@var{dev}
   connect @var{filename} to NBD device @var{dev}
 @item -d, --disconnect
   disconnect the specified device
 @item -e, --shared=@var{num}
   device can be shared by @var{num} clients (default @samp{1})
+@item -f, --format=@var{fmt}
+  force block driver for format @var{fmt} instead of auto-detecting
 @item -t, --persistent
   don't exit on the last connection
 @item -v, --verbose