* locking and setgid files
@ 2010-09-09 21:15 Orion Poplawski
2010-09-09 21:43 ` Trond Myklebust
0 siblings, 1 reply; 2+ messages in thread
From: Orion Poplawski @ 2010-09-09 21:15 UTC (permalink / raw)
To: linux-nfs
Is this expected?
$ ls -l /data/sw/svn/dombroski/supergran_paper/db/txn-current-lock
-rw-rwSr--. 1 dombroski superg 0 Aug 30 16:27 txn-current-lock
$ id
uid=6412(aaronb) gid=1001(cora) groups=1001(cora),1041(superg)
context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
open("/data/sw/svn/dombroski/supergran_paper/db/txn-current-lock", O_RDWR) = 3
fcntl64(3, F_GETLK, {type=F_WRLCK, whence=SEEK_SET, start=0, len=0,
pid=10771680}) = -1 ENOLCK (No locks available)
I guess I could somewhat understand it, though the fcntl64() call succeeds on
the server (CentOS 5.5).
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: locking and setgid files
2010-09-09 21:15 locking and setgid files Orion Poplawski
@ 2010-09-09 21:43 ` Trond Myklebust
0 siblings, 0 replies; 2+ messages in thread
From: Trond Myklebust @ 2010-09-09 21:43 UTC (permalink / raw)
To: Orion Poplawski; +Cc: linux-nfs
On Thu, 2010-09-09 at 21:15 +0000, Orion Poplawski wrote:
> Is this expected?
>
> $ ls -l /data/sw/svn/dombroski/supergran_paper/db/txn-current-lock
> -rw-rwSr--. 1 dombroski superg 0 Aug 30 16:27 txn-current-lock
>
> $ id
> uid=6412(aaronb) gid=1001(cora) groups=1001(cora),1041(superg)
> context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
>
> open("/data/sw/svn/dombroski/supergran_paper/db/txn-current-lock", O_RDWR) = 3
> fcntl64(3, F_GETLK, {type=F_WRLCK, whence=SEEK_SET, start=0, len=0,
> pid=10771680}) = -1 ENOLCK (No locks available)
>
> I guess I could somewhat understand it, though the fcntl64() call succeeds on
> the server (CentOS 5.5).
It is quite conceivable that your CentOS 5.5 NFS server lacks the proper
support for mandatory posix locking. We only test regularly with
advisory locks.
Cheers
Trond
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