• Andy Adamson's avatar
    nfs41: setup_sequence method · fbcd4abc
    Andy Adamson authored
    Allocate a slot in the session slot table and set the sequence op arguments.
    
    Called at the rpc prepare stage.
    
    Add a status to nfs41_sequence_res, initialize it to one so that we catch
    rpc level failures which do not go through decode_sequence which sets
    the new status field.
    
    Note that upon an rpc level failure, we don't know if the server processed the
    sequence operation or not. Proceed as if the server did process the sequence
    operation.
    Signed-off-by: default avatarRahul Iyer <iyer@netapp.com>
    [nfs41: sequence args use slotid]
    [nfs41: find slot return slotid]
    Signed-off-by: default avatarAndy Adamson <andros@netapp.com>
    Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>
    [nfs41: remove SEQ4_STATUS_USE_TK_STATUS]
    As per 11-14-08 review
    [move extern declaration from nfs41: sequence setup/done support]
    [removed sa_session definition, changed sa_cache_this into a u8 to reduce footprint]
    Signed-off-by: default avatarAndy Adamson <andros@netapp.com>
    Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>
    [nfs41: rpc_sleep_on slot_tbl_waitq must be called under slot_tbl_lock]
        Otherwise there's a race (we've hit) with nfs4_free_slot where
        nfs41_setup_sequence sees a full slot table, unlocks slot_tbl_lock,
        nfs4_free_slots happen concurrently and call rpc_wake_up_next
        where there's nobody to wake up yet, context goes back to
        nfs41_setup_sequence which goes to sleep when the slot table
        is actually empty now and there's no-one to wake it up anymore.
    Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>
    Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
    fbcd4abc
nfs4_fs.h 9.35 KB