From: Petr Vorel <pvorel@suse.cz>
To: NeilBrown <neilb@suse.de>
Cc: "J . Bruce Fields" <bfields@fieldses.org>,
linux-nfs@vger.kernel.org, Steve Dickson <steved@redhat.com>,
Chuck Lever <chuck.lever@oracle.com>,
Alexey Kodanev <alexey.kodanev@oracle.com>
Subject: Re: [PATCH/RFC v2 nfs-utils] Fix NFSv4 export of tmpfs filesystems.
Date: Mon, 17 May 2021 17:00:43 +0200 [thread overview]
Message-ID: <YKKFG6Osa0BmT6JB@pevik> (raw)
In-Reply-To: <162122673178.19062.96081788305923933@noble.neil.brown.name>
Hi Neil,
> Some filesystems cannot be exported without an fsid or uuid.
> tmpfs is the main example.
> When mountd (or exportd) creates nfsv4 pseudo-root exports for the path
> leading down to an export point it exports each directory without any
> fsid or uuid. If one of these directories is on tmp, that will fail.
> The net result is that exporting a subdirectory of a tmpfs filesystem
> will not work over NFSv4 as the parents within the filesystem cannot be
> exported. It will either fail, or fall-back to NFSv3 (depending on the
> version of the mount.nfs program).
> To fix this we need to provide an fsid or uuid for these pseudo-root
> exports. This patch does that by creating an RFC-4122 V5 compatible
> UUID based on an arbitrary seed and the path to the export.
> To check if an export needs a uuid, text_export() is moved from exportfs
> to libexport.a, modified slightly and renamed to export_test().
> Signed-off-by: NeilBrown <neilb@suse.de>
Tested-by: Petr Vorel <pvorel@suse.cz>
tmpfs and btrfs via LTP test nfs01 on openSUSE.
Kind regards,
Petr
next prev parent reply other threads:[~2021-05-17 15:02 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-22 19:18 [RFC PATCH 1/1] mount.nfs: Fix mounting on tmpfs Petr Vorel
2021-04-22 20:23 ` J . Bruce Fields
2021-04-23 2:17 ` Petr Vorel
2021-04-23 14:23 ` J . Bruce Fields
2021-04-23 17:04 ` Petr Vorel
2021-04-23 18:13 ` J . Bruce Fields
2021-04-23 20:37 ` Petr Vorel
2021-05-03 2:21 ` NeilBrown
2021-05-03 8:10 ` Petr Vorel
2021-05-03 14:15 ` J . Bruce Fields
2021-04-23 13:50 ` Petr Vorel
2021-05-07 1:48 ` [PATCH/RFC nfs-utils] Fix NFSv4 export of tmpfs filesystems NeilBrown
2021-05-07 10:06 ` Petr Vorel
2021-05-13 4:07 ` NeilBrown
2021-05-13 18:38 ` Petr Vorel
2021-05-13 18:51 ` Petr Vorel
2021-05-17 3:08 ` NeilBrown
2021-05-17 14:27 ` Petr Vorel
2021-05-07 13:55 ` Chuck Lever III
2021-05-07 23:13 ` NeilBrown
2021-05-17 4:45 ` [PATCH/RFC v2 " NeilBrown
2021-05-17 15:00 ` Petr Vorel [this message]
2021-05-18 17:54 ` Petr Vorel
2021-05-20 17:37 ` Steve Dickson
2021-05-20 20:39 ` Petr Vorel
2021-05-21 1:38 ` NeilBrown
2021-05-21 1:40 ` [PATCH nfs-utils 1/2] Remove 'force' arg from cache_flush() NeilBrown
2021-05-21 1:41 ` [PATCH nfs-utils 2/2] Move declaration of etab and rmtab into libraries NeilBrown
2021-05-21 13:57 ` Petr Vorel
2021-05-23 18:31 ` Steve Dickson
2021-05-21 13:52 ` [PATCH nfs-utils 1/2] Remove 'force' arg from cache_flush() Petr Vorel
2021-05-23 18:30 ` Steve Dickson
2021-05-23 18:29 ` [PATCH/RFC v2 nfs-utils] Fix NFSv4 export of tmpfs filesystems Steve Dickson
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