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NFS: Introduce NFS_ATTR_FATTR_V4_LOCATIONS

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The Linux NFS client must distinguish between referral events (which
it currently supports) and migration events (which it does not yet
support).

In both types of events, an fs_locations array is returned.  But upper
layers, not the XDR layer, should make the distinction between a
referral and a migration.  There really isn't a way for an XDR decoder
function to distinguish the two, in general.

Slightly adjust the FATTR flags returned by decode_fs_locations()
to set NFS_ATTR_FATTR_V4_LOCATIONS only if a non-empty locations
array was returned from the server.  Then have logic in nfs4proc.c
distinguish whether the locations array is for a referral or
something else.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever
2012-03-01 17:01:57 -05:00
committed by Trond Myklebust
parent bb4dae5e5b
commit 81934ddb8e
3 changed files with 10 additions and 9 deletions
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2
fs/nfs/nfs4xdr.c
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@ -3660,7 +3660,7 @@ static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, st
res->nlocations++;
}
if (res->nlocations != 0)
status = NFS_ATTR_FATTR_V4_REFERRAL;
status = NFS_ATTR_FATTR_V4_LOCATIONS;
out:
dprintk("%s: fs_locations done, error = %d\n", __func__, status);
return status;