Commit a41cbe86 authored Sep 14, 2015 by Olga Kornievskaia Committed by Trond Myklebust Sep 17, 2015

Failing to send a CLOSE if file is opened WRONLY and server reboots on a 4.x mount



A test case is as the description says:
open(foobar, O_WRONLY);
sleep()  --> reboot the server
close(foobar)

The bug is because in nfs4state.c in nfs4_reclaim_open_state() a few
line before going to restart, there is
clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &state->flags).

NFS4CLNT_RECLAIM_NOGRACE is a flag for the client states not open
owner states. Value of NFS4CLNT_RECLAIM_NOGRACE is 4 which is the
value of NFS_O_WRONLY_STATE in nfs4_state->flags. So clearing it wipes
out state and when we go to close it, “call_close” doesn’t get set as
state flag is not set and CLOSE doesn’t go on the wire.

Signed-off-by: Olga Kornievskaia <aglo@umich.edu>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

parent 6ff33f39

fs/nfs/nfs4state.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1481,7 +1481,7 @@ restart:
		spin_unlock(&state->state_lock);
		}
		nfs4_put_open_state(state);
		clear_bit(NFS4CLNT_RECLAIM_NOGRACE,
		clear_bit(NFS_STATE_RECLAIM_NOGRACE,
		&state->flags);
		spin_lock(&sp->so_lock);
		goto restart;