BMC/Intel-BMC/linux.git/fs/nfs/nfs4session.c, branch dev

NFSv4.1: Don't set up a backchannel if the server didn't agree to do so

2015-02-18T20:30:47+00:00

If the server doesn't agree to out backchannel setup request, then don't set one up. Signed-off-by: Trond Myklebust

NFSv4.1: nfs4_destroy_session must call rpc_destroy_waitqueue

2014-02-01T20:13:39+00:00

There may still be timers active on the session waitqueues. Make sure that we kill them before freeing the memory. Cc: stable@vger.kernel.org # 3.12+ Signed-off-by: Trond Myklebust

When CONFIG_NFS_V4_1 is not enabled, "make C=2" emits this warning:

2013-09-04T16:26:30+00:00

linux/fs/nfs/nfs4session.c:337:6: warning: symbol 'nfs41_set_target_slotid' was not declared. Should it be static? Move nfs41_set_target_slotid() and nfs41_update_target_slotid() back behind CONFIG_NFS_V4_1, since, in the final revision of this work, they are used only in NFSv4.1 and later. Signed-off-by: Chuck Lever Signed-off-by: Trond Myklebust

NFS: Add global helper for releasing slot table resources

2013-09-03T19:26:34+00:00

The nfs4_destroy_slot_tables() function is renamed to avoid confusion with the new helper. Signed-off-by: Chuck Lever Signed-off-by: Trond Myklebust

NFS: Add global helper to set up a stand-along nfs4_slot_table

2013-09-03T19:26:34+00:00

Signed-off-by: Chuck Lever Signed-off-by: Trond Myklebust

NFS: Enable slot table helpers for NFSv4.0

2013-09-03T19:26:33+00:00

I'd like to re-use NFSv4.1's slot table machinery for NFSv4.0 transport blocking. Re-organize some of nfs4session.c so the slot table code is built even when NFS_V4_1 is disabled. Signed-off-by: Chuck Lever Signed-off-by: Trond Myklebust

NFS: When displaying session slot numbers, use "%u" consistently

2013-09-03T19:26:30+00:00

Clean up, since slot and sequence numbers are all unsigned anyway. Among other things, squelch compiler warnings: linux/fs/nfs/nfs4proc.c: In function ‘nfs4_setup_sequence’: linux/fs/nfs/nfs4proc.c:703:2: warning: signed and unsigned type in conditional expression [-Wsign-compare] and linux/fs/nfs/nfs4session.c: In function ‘nfs4_alloc_slot’: linux/fs/nfs/nfs4session.c:151:31: warning: signed and unsigned type in conditional expression [-Wsign-compare] Signed-off-by: Chuck Lever Signed-off-by: Trond Myklebust

NFS: Never use user credentials for lease renewal

2013-08-07T17:06:08+00:00

Never try to use a non-UID 0 user credential for lease management, as that credential can change out from under us. The server will block NFSv4 lease recovery with NFS4ERR_CLID_INUSE. Since the mechanism to acquire a credential for lease management is now the same for all minor versions, replace the minor version- specific callout with a single function. Signed-off-by: Chuck Lever Signed-off-by: Trond Myklebust

NFSv4.1 Refactor nfs4_init_session and nfs4_init_channel_attrs

2013-06-28T19:55:19+00:00

nfs4_init_session was originally written to be called prior to nfs4_init_channel_attrs, setting the session target_max response and request sizes that nfs4_init_channel_attrs would pay attention to. In the current code flow, nfs4_init_session, just like nfs4_init_ds_session for the data server case, is called after the session is all negotiated, and is actually used in a RECLAIM COMPLETE call to the server. Remove the un-needed fc_target_max response and request fields from nfs4_session and just set the max_resp_sz and max_rqst_sz in nfs4_init_channel_attrs. Signed-off-by: Andy Adamson Signed-off-by: Trond Myklebust

NFSv4.1 Fix a pNFS session draining deadlock

2013-05-20T18:20:14+00:00

On a CB_RECALL the callback service thread flushes the inode using filemap_flush prior to scheduling the state manager thread to return the delegation. When pNFS is used and I/O has not yet gone to the data server servicing the inode, a LAYOUTGET can preceed the I/O. Unlike the async filemap_flush call, the LAYOUTGET must proceed to completion. If the state manager starts to recover data while the inode flush is sending the LAYOUTGET, a deadlock occurs as the callback service thread holds the single callback session slot until the flushing is done which blocks the state manager thread, and the state manager thread has set the session draining bit which puts the inode flush LAYOUTGET RPC to sleep on the forechannel slot table waitq. Separate the draining of the back channel from the draining of the fore channel by moving the NFS4_SESSION_DRAINING bit from session scope into the fore and back slot tables. Drain the back channel first allowing the LAYOUTGET call to proceed (and fail) so the callback service thread frees the callback slot. Then proceed with draining the forechannel. Signed-off-by: Andy Adamson Signed-off-by: Trond Myklebust