2015-05-15 15:55:03

by Olga Kornievskaia

[permalink] [raw]
Subject: [PATCH 1/1] fixing infinite OPEN loop in 4.0 stateid recovery

Problem: When an operation like WRITE receives a BAD_STATEID, even though
recovery code clears the RECLAIM_NOGRACE recovery flag before recovering
the open state, because of clearing delegation state for the associated
inode, nfs_inode_find_state_and_recover() gets called and it makes the
same state with RECLAIM_NOGRACE flag again. As a results, when we restart
looking over the open states, we end up in the infinite loop instead of
breaking out in the next test of state flags.

Solution: unset the RECLAIM_NOGRACE set because of
calling of nfs_inode_find_state_and_recover() after returning from calling
recover_open() function.

Signed-off-by: Olga Kornievskaia <[email protected]>
---
fs/nfs/nfs4state.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 2782cfc..e99e1f0 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1482,6 +1482,8 @@ restart:
spin_unlock(&state->state_lock);
}
nfs4_put_open_state(state);
+ test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE,
+ &state->flags);
spin_lock(&sp->so_lock);
goto restart;
}
--
1.8.3.1