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Anthony Iliopoulos 982815bb04 nfsd: fix return error code for nfsd_map_name_to_[ug]id 
[ Upstream commit 404d779466 ]

idmap lookups can time out while the cache is waiting for a userspace
upcall reply. In that case cache_check() returns -ETIMEDOUT to callers.

The nfsd_map_name_to_[ug]id functions currently proceed with attempting
to map the id to a kuid despite a potentially temporary failure to
perform the idmap lookup. This results in the code returning the error
NFSERR_BADOWNER which can cause client operations to return to userspace
with failure.

Fix this by returning the failure status before attempting kuid mapping.

This will return NFSERR_JUKEBOX on idmap lookup timeout so that clients
can retry the operation instead of aborting it.

Fixes: 65e10f6d0a ("nfsd: Convert idmap to use kuids and kgids")
Cc: stable@vger.kernel.org
Signed-off-by: Anthony Iliopoulos <ailiop@suse.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-03-04 07:21:49 -05:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.