On 07/09/2012 12:47 PM, Steven Hein wrote:
> Hi All--
>
> I'm having issues with yaffs2 NFS exports
> after rebooting the NFS server. Most of the time, clients that
> are connected before the server reboot can no longer access the
> mount after the server returns.
>
> If I turn on NFS debugging, I see messages like these when
> the clients attempt to access the mounts:
>
> nfsd_dispatch: vers 3 proc 1
> nfsd: GETATTR(3) 16: 01000101 00000064 00000207 00000000 00000000
> 00000000
> nfsd: fh_verify(16: 01000101 00000064 00000207 00000000 00000000
> 00000000)
> nfsd: Dropping request; may be revisited later
>
> After much debugging, I traced this back to the behavior of
> the yaffs2_get_parent(). I found that it was always returning
> -ENOMEM, because d_obtain_alias() returned a valid dentry.
>
> I looked at other filesystems type *_get_parent() functions,
> and many of them return the result of d_obtain_alias() directly,
> so I tried that (effectively removing the "if (!IS_ERR(parent))" block),
> and now the client reconnects work correctly. (The only side
> effect that I see is that the first attempt to read a directory
> within the mount will cause reconnect_path()--the caller of
> yaffs2_get_parent()--to return -ESTALE, but all future attempts
> always work correctly).
>
> My server is a linux-2.6.35.14 with the YAFFS2 version GIT tagged
> "aleph1-release" (I had previously been running an earlier YAFFS2
> version). This behavior appears to be unique to YAFFS2, as I have
> done tests with both YAFFS2 and JFFS2 mounts, and I do not see
> the failure on JFFS2 (nor do I see the -ESTALE on the first mount
> attempt after server reboot).
>
>
> I know precious little about NFS filesystems/exports at this level,
> so I would appreciate any help or pointers!
>
>
> Regards,
> Steve
>
Hi again--
I haven't seen any response on this question. Can anyone comment
on their use of YAFFS from NFS. Is anyone exporting YAFFS2
filesystems via NFS? Is anyone seeing issues with NFS clients
accessing the links after the server reboots?
Thanks for any sharing any info or experiences!
Regards, Steve
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