* [PATCH] docs: qsd: Explain --export nbd,name=... default
@ 2021-03-05 9:48 Kevin Wolf
2021-03-05 15:06 ` Max Reitz
2021-03-05 19:40 ` Eric Blake
0 siblings, 2 replies; 3+ messages in thread
From: Kevin Wolf @ 2021-03-05 9:48 UTC (permalink / raw)
To: qemu-block; +Cc: kwolf, qemu-devel
The 'name' option for NBD exports is optional. Add a note that the
default for the option is the node name (people could otherwise expect
that it's the empty string like for qemu-nbd).
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
docs/tools/qemu-storage-daemon.rst | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/docs/tools/qemu-storage-daemon.rst b/docs/tools/qemu-storage-daemon.rst
index fe3042d609..086493ebb3 100644
--- a/docs/tools/qemu-storage-daemon.rst
+++ b/docs/tools/qemu-storage-daemon.rst
@@ -80,8 +80,9 @@ Standard options:
requests for modifying data (the default is off).
The ``nbd`` export type requires ``--nbd-server`` (see below). ``name`` is
- the NBD export name. ``bitmap`` is the name of a dirty bitmap reachable from
- the block node, so the NBD client can use NBD_OPT_SET_META_CONTEXT with the
+ the NBD export name (if not specified, it defaults to the given
+ ``node-name``). ``bitmap`` is the name of a dirty bitmap reachable from the
+ block node, so the NBD client can use NBD_OPT_SET_META_CONTEXT with the
metadata context name "qemu:dirty-bitmap:BITMAP" to inspect the bitmap.
The ``vhost-user-blk`` export type takes a vhost-user socket address on which
--
2.29.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] docs: qsd: Explain --export nbd,name=... default
2021-03-05 9:48 [PATCH] docs: qsd: Explain --export nbd,name=... default Kevin Wolf
@ 2021-03-05 15:06 ` Max Reitz
2021-03-05 19:40 ` Eric Blake
1 sibling, 0 replies; 3+ messages in thread
From: Max Reitz @ 2021-03-05 15:06 UTC (permalink / raw)
To: Kevin Wolf, qemu-block; +Cc: qemu-devel
On 05.03.21 10:48, Kevin Wolf wrote:
> The 'name' option for NBD exports is optional. Add a note that the
> default for the option is the node name (people could otherwise expect
> that it's the empty string like for qemu-nbd).
>
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> ---
> docs/tools/qemu-storage-daemon.rst | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
Reviewed-by: Max Reitz <mreitz@redhat.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] docs: qsd: Explain --export nbd,name=... default
2021-03-05 9:48 [PATCH] docs: qsd: Explain --export nbd,name=... default Kevin Wolf
2021-03-05 15:06 ` Max Reitz
@ 2021-03-05 19:40 ` Eric Blake
1 sibling, 0 replies; 3+ messages in thread
From: Eric Blake @ 2021-03-05 19:40 UTC (permalink / raw)
To: Kevin Wolf, qemu-block; +Cc: qemu-devel
On 3/5/21 3:48 AM, Kevin Wolf wrote:
> The 'name' option for NBD exports is optional. Add a note that the
> default for the option is the node name (people could otherwise expect
> that it's the empty string like for qemu-nbd).
>
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> ---
> docs/tools/qemu-storage-daemon.rst | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
Hmm. If we are only exporting a single image, letting "" serve as the
default export name as a synonym for the non-empty node-name might be
nice. But we can export more than one image at a time, at which point
"" has no sane default, so always requiring the client to know the node
name is tolerable. And 'qemu-nbd --list' or 'nbdinfo --list' are
capable of showing which node name(s) an NBD server is exposing.
Reviewed-by: Eric Blake <eblake@redhat.com>
>
> diff --git a/docs/tools/qemu-storage-daemon.rst b/docs/tools/qemu-storage-daemon.rst
> index fe3042d609..086493ebb3 100644
> --- a/docs/tools/qemu-storage-daemon.rst
> +++ b/docs/tools/qemu-storage-daemon.rst
> @@ -80,8 +80,9 @@ Standard options:
> requests for modifying data (the default is off).
>
> The ``nbd`` export type requires ``--nbd-server`` (see below). ``name`` is
> - the NBD export name. ``bitmap`` is the name of a dirty bitmap reachable from
> - the block node, so the NBD client can use NBD_OPT_SET_META_CONTEXT with the
> + the NBD export name (if not specified, it defaults to the given
> + ``node-name``). ``bitmap`` is the name of a dirty bitmap reachable from the
> + block node, so the NBD client can use NBD_OPT_SET_META_CONTEXT with the
> metadata context name "qemu:dirty-bitmap:BITMAP" to inspect the bitmap.
>
> The ``vhost-user-blk`` export type takes a vhost-user socket address on which
>
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-03-05 15:06 ` Max Reitz
2021-03-05 19:40 ` Eric Blake
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