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Chuck Lever authored
Currently, the compound operation the Linux NFS client sends to the server to confirm a client ID looks like this: { SETCLIENTID_CONFIRM; PUTROOTFH; GETATTR(lease_time) } Once the lease is confirmed, it makes sense to know how long before the client will have to renew it. And, performing these operations in the same compound saves a round trip. Unfortunately, this arrangement assumes that the security flavor used for establishing a client ID can also be used to access the server's pseudo-fs. If the server requires a different security flavor to access its pseudo-fs than it allowed for the client's SETCLIENTID operation, the PUTROOTFH in this compound fails with NFS4ERR_WRONGSEC. Even though the SETCLIENTID_CONFIRM succeeded, our client's trunking detection logic interprets the failure of the compound as a failure by the server to confirm the client ID. As part of server trunking detection, the client then begins another SETCLIENTID pass with the same nfs4_client_id. This fails with NFS4ERR_CLID_INUSE because the first SETCLIENTID/SETCLIENTID_CONFIRM already succeeded in confirming that client ID -- it was the PUTROOTFH operation that caused the SETCLIENTID_CONFIRM compound to fail. To address this issue, separate the "establish client ID" step from the "accessing the server's pseudo-fs root" step. The first access of the server's pseudo-fs may require retrying the PUTROOTFH operation with different security flavors. This access is done in nfs4_proc_get_rootfh(). That leaves the matter of how to retrieve the server's lease time. nfs4_proc_fsinfo() already retrieves the lease time value, though none of its callers do anything with the retrieved value (nor do they mark the lease as "renewed"). Note that NFSv4.1 state recovery invokes nfs4_proc_get_lease_time() using the lease management security flavor. This may cause some heartburn if that security flavor isn't the same as the security flavor the server requires for accessing the pseudo-fs. Signed-off-by:
Chuck Lever <chuck.lever@oracle.com> Cc: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by:
Trond Myklebust <Trond.Myklebust@netapp.com>
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