Am 06.09.2017 um 10:50 hat Richard W.M. Jones geschrieben:
> Commit 16b48d5d66d2 ("file-posix: Add 'locking' option") added this
> option, but as it was not documented in the -help output it was not
> easily possible to tell if a particular qemu binary supports it.
>
> Signed-off-by: Richard W.M. Jones <rjo...@redhat.com>
> ---
> qemu-options.hx | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 9f6e2adfff..f8f95eb498 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -796,7 +796,7 @@ DEF("drive", HAS_ARG, QEMU_OPTION_drive,
> "
> [,cache=writethrough|writeback|none|directsync|unsafe][,format=f]\n"
> " [,serial=s][,addr=A][,rerror=ignore|stop|report]\n"
> "
> [,werror=ignore|stop|report|enospc][,id=name][,aio=threads|native]\n"
> - " [,readonly=on|off][,copy-on-read=on|off]\n"
> + " [,readonly=on|off][,copy-on-read=on|off][,locking=off|auto|on]\n"
> " [,discard=ignore|unmap][,detect-zeroes=on|off|unmap]\n"
> " [[,bps=b]|[[,bps_rd=r][,bps_wr=w]]]\n"
> " [[,iops=i]|[[,iops_rd=r][,iops_wr=w]]]\n"
'locking' is a driver-specific option and not universally available for
all images, so it shouldn't be included here.
Of course, you're right that driver-specific options should be
documented somewhere, and currently that's only in the QAPI schema for
blockdev-add, which isn't quite satisfying. Maybe adding them to the
'qemu-block-drivers' man page could work (which currently only contains
'qemu-img create' options).
Kevin
