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afs: Fix file locking on R/O volumes to operate in local mode

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[ Upstream commit b590eb41be ]

AFS doesn't really do locking on R/O volumes as fileservers don't maintain
state with each other and thus a lock on a R/O volume file on one
fileserver will not be be visible to someone looking at the same file on
another fileserver.

Further, the server may return an error if you try it.

Fix this by doing what other AFS clients do and handle filelocking on R/O
volume files entirely within the client and don't touch the server.

Fixes: 6c6c1d63c2 ("afs: Provide mount-time configurable byte-range file locking emulation")
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Howells 2023-11-01 22:03:28 +00:00 committed by Greg Kroah-Hartman
parent 844a4272a4
commit ceca54f1f0
1 changed files with 2 additions and 0 deletions
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2
fs/afs/super.c
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@ -407,6 +407,8 @@ static int afs_validate_fc(struct fs_context *fc)
return PTR_ERR(volume);
ctx->volume = volume;
if (volume->type != AFSVL_RWVOL)
ctx->flock_mode = afs_flock_mode_local;
}
return 0;