Re: [PATCH nfs-utils v3 00/11] mountd: bugfixes for up/downcall interfaces

[Steve Dickson <steved@redhat.com>]

On 9/14/26 9:14 AM, Jeff Layton wrote:
> The main difference in this version is some cleanup to the warning
> messages, so that we don't warn about internal events. Mantas, if you're
> able to test this version too, that would be great.
> 
> Mantas reported a problem with his configuration that was using crossmnt
> and autofs to export a number of btrfs filesystems. Some analysis with
> Claude also uncovered a few other bugs. This version also fixes a
> number of problems that Sashiko flagged. Some of them were preexisting
> but seemed like good things to fix.
> 
> Signed-off-by: Jeff Layton <jlayton@kernel.org>
> ---
> Changes in v3:
> - Stop warning twice per unexportable path
> - Keep a warning for the ip_map and unix_gid answers, which have no fallback
> - Don't warn about a submount nobody asked to export
> - Quieten the same message on the pipefs downcall (preexisting)
> - Link to v2: https://lore.kernel.org/r/20260911-nl-crossmnt-v2-0-f4d869951c5e@kernel.org
> 
> Changes in v2:
> - Retry instead of caching a negative when the failure may be transient:
>    kernel errno, statfs, fsidd, and an undelivered negative fallback
> - Drop a deferred request once it has been answered
> - Bound the junction path copied into exportent.e_path (preexisting)
> - Give each worker its own netlink command socket (preexisting)
> - Bound the retry queues (preexisting)
> - Link to v1: https://lore.kernel.org/r/20260909-nl-crossmnt-v1-0-4064b5a3bd85@kernel.org
> 
> ---
> Jeff Layton (11):
>        mountd: factor out the per-path export attribute computation
>        mountd: handle unmountable paths and junctions in the netlink downcall
>        mountd: answer requests the kernel rejects on the netlink downcall
>        mountd: don't leak the parent export's fsid onto crossmnt submounts
>        mountd: retry unresolvable fsid lookups on the netlink downcall
>        mountd: bound the junction path before copying it into e_path
>        mountd: give each worker its own netlink command socket
>        mountd: retry export attributes that fail to resolve for a passing reason
>        mountd: drop a deferred fsid lookup once it has been answered
>        mountd: bound the retry queues
>        mountd: don't warn about pipefs submounts nobody asked to export
> 
>   support/export/cache.c | 1391 +++++++++++++++++++++++++++++++++++++-----------
>   1 file changed, 1084 insertions(+), 307 deletions(-)
> ---
> base-commit: 630393e9c73667b3fda6a7507cb5171ec0ec38dc
> change-id: 20260908-nl-crossmnt-85584b71c721
> 
> Best regards,
Committed... (tag: nfs-utils-2-9-3-rc6)

steved