[OpenAFS] Re: experience of SQLite on AFS

Derrick Brashear shadow@gmail.com
Sun, 2 May 2010 19:09:16 -0400

On Sat, May 1, 2010 at 2:25 AM, Brandon S. Allbery KF8NH
<allbery@ece.cmu.edu> wrote:
> On Apr 30, 2010, at 18:07 , Andrew Deason wrote:
>> After some offline discussion, this appears to probably be the case.
>> sqlite opens the db file O_RDONLY, and attempts to acquire an fcntl
>> F_WRLCK on it, to which it gets EROFS back. Trying to acquire a
>> writelock on a file opened readonly doesn't make a lot of sense to me;
>> can someone tell me if POSIX specifies that that should fail?
> It does, yes (inherited from SVID).
>> In any case, I think technically fcntl should be returning EBADF here,
>> not EROFS (I think this is our fault, but I haven't checked yet). I
> EACCES is the POSIX-specified errno.

I looked at this on Friday and failed to send mail; I was
loosely-connected all weekend.

Presumably what's happening is the fileserver is returning VREADONLY
(VGetVnode with WRITE_LOCK, from CheckVnode from GetVolumePackage),
which the client maps to EROFS.

Any new RPC might want to return other errors, but that's out of scope
for now. So, now that I have real net, the fix is in gerrit as 1895