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    SubjectRe: Failure to fallback to nfsd-v3 (?)
    On Sun, Feb 07, 2010 at 12:32:04PM +0900, OGAWA Hirofumi wrote:
    > Hi,
    >
    > I've recently noticed I couldn't mount nfs on 2.6.33-rc6. The environment is
    >
    > server (nfsd-v3, 2.6.33-rc6) <-> client (2.6.32.7, nfs-utils 1.2.1)
    >
    > And mount command is
    >
    > # mount server:/path /mntpoint
    >
    > (i.e. without any options. If I specified "vers=3" option, it works).
    >
    > With some debugging, it seems to change of the error code on nfsd - the
    > log of failure is the following.
    >
    > nfsd_dispatch: vers 4 proc 0
    > nfsd_dispatch: vers 4 proc 1
    > nfsv4 compound op #1/3: 24 (OP_PUTROOTFH)
    > nfsv4 compound op ffff88012d9e10c0 opcnt 3 #1: 24: status 30000
    > nfsv4 compound returned 30000
    > nfsd: Dropping request; may be revisited later
    > found domain *.xxx.xx
    > found fsidtype 1
    > found fsid length 4
    > Path seems to be <>
    > nfsd_dispatch: vers 4 proc 1
    > nfsv4 compound op #1/3: 24 (OP_PUTROOTFH)
    > nfsv4 compound op ffff88012dab6228 opcnt 3 #1: 24: status 10006
    > nfsv4 compound returned 10006
    >
    > On the older kernel (2.6.32.7), it seems to fallback to nfsv3,
    >
    > nfsd_dispatch: vers 4 proc 0
    > nfsd_dispatch: vers 4 proc 1
    > nfsv4 compound op #1/3: 24 (OP_PUTROOTFH)
    > nfsv4 compound op d9c04850 opcnt 3 #1: 24: status 2
    > nfsv4 compound returned 2
    > nfsd_dispatch: vers 3 proc 0
    > [...]
    >
    >
    > And the following commit seems to change the behavior.
    >
    > [nfsd4: fix error return when pseudoroot missing]
    > f39bde24b275ddc45df1ed835725b609e178c7a0
    >
    > Well, anyway, is this a expected behavior change, or something bug?

    It's expected. I'd recommend turning off nfsv4 on the server (add "-N4"
    to the rpc.nfsd commandline) for now.

    --b.


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