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    nfs41: add session setup to the state manager · 76db6d95
    Andy Adamson 提交于
    At mount, nfs_alloc_client sets the cl_state NFS4CLNT_LEASE_EXPIRED bit
    and nfs4_alloc_session sets the NFS4CLNT_SESSION_SETUP bit, so both bits are
    set when nfs4_lookup_root calls nfs4_recover_expired_lease which schedules
    the nfs4_state_manager and waits for it to complete.
    
    Place the session setup after the clientid establishment in nfs4_state_manager
    so that the session is setup right after the clientid has been established
    without rescheduling the state manager.
    
    Unlike nfsv4.0, the nfs_client struct is not ready to use until the session
    has been established.  Postpone marking the nfs_client struct to NFS_CS_READY
    until after a successful CREATE_SESSION call so that other threads cannot use
    the client until the session is established.
    
    If the EXCHANGE_ID call fails and the session has not been setup (the
    NFS4CLNT_SESSION_SETUP bit is set), mark the client with the error and return.
    
    If the session setup CREATE_SESSION call fails with NFS4ERR_STALE_CLIENTID
    which could occur due to server reboot or network partition inbetween the
    EXCHANGE_ID and CREATE_SESSION call, reset the NFS4CLNT_LEASE_EXPIRED and
    NFS4CLNT_SESSION_SETUP bits and try again.
    
    If the CREATE_SESSION call fails with other errors, mark the client with
    the error and return.
    Signed-off-by: NAndy Adamson <andros@netapp.com>
    Signed-off-by: NBenny Halevy <bhalevy@panasas.com>
    
    [nfs41: NFS_CS_SESSION_SETUP cl_cons_state for back channel setup]
      On session setup, the CREATE_SESSION reply races with the server back channel
      probe which needs to succeed to setup the back channel. Set a new
      cl_cons_state NFS_CS_SESSION_SETUP just prior to the CREATE_SESSION call
      and add it as a valid state to nfs_find_client so that the client back channel
      can find the nfs_client struct and won't drop the server backchannel probe.
      Use a new cl_cons_state so that NFSv4.0 back channel behaviour which only
      sets NFS_CS_READY is unchanged.
      Adjust waiting on the nfs_client_active_wq accordingly.
    Signed-off-by: NAndy Adamson <andros@netapp.com>
    Signed-off-by: NBenny Halevy <bhalevy@panasas.com>
    
    [nfs41: rename NFS_CS_SESSION_SETUP to NFS_CS_SESSION_INITING]
    Signed-off-by: NAndy Adamson <andros@netapp.com>
    [nfs41: set NFS_CL_SESSION_INITING in alloc_session]
    Signed-off-by: NAndy Adamson <andros@netapp.com>
    [nfs41: move session setup into a function]
    Signed-off-by: NAndy Adamson <andros@netapp.com>
    Signed-off-by: NBenny Halevy <bhalevy@panasas.com>
    [moved nfs4_proc_create_session declaration here]
    Signed-off-by: NBenny Halevy <bhalevy@panasas.com>
    Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
    76db6d95
client.c 43.4 KB