Fwiw, the following upstream commit seems relevant....
commit 87d83b6ad2e52a3c867fe2f758e4eccaea145a10
Author: Petr Uzel <petr.u...@suse.cz>
Date: Thu Sep 15 10:19:17 2011 +0200
flock: make flock(1) work on NFSv4
To pleace an exclusive lock on a file, NFSv4 requires
the file to be opened RW because of the emulation of flock()
by fcntl():
http://www.spinics.net/lists/linux-nfs/msg18502.html
So instead of O_RDONLY, open the file in O_RDWR if access()
indicates it is possible (unless shared lock is requested).
From: Michal Kubecek <mkube...@suse.cz>
Signed-off-by: Petr Uzel <petr.u...@suse.cz>
This was first part of released v2.21 ....
(It seems NFSv4 emulates flock by using fcntl according to code
comment for EBADF error handling saying:
"Probably NFSv4 where flock() is emulated by fcntl()."
)
Regards,
Andreas Henriksson
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