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| author | Andy Adamson <andros@netapp.com> | 2009-12-04 15:55:38 -0500 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2009-12-04 15:55:38 -0500 |
| commit | ea028ac92541ac30bf202ed94cb53eec2ea0c9d6 (patch) | |
| tree | f9b807cf0f870db922f96e72dab68ed37ba18cf0 /fs/nfs/nfs4state.c | |
| parent | 05f0d2364726c92f6b870db654967088349379fe (diff) | |
| download | kernel_samsung_crespo-ea028ac92541ac30bf202ed94cb53eec2ea0c9d6.zip kernel_samsung_crespo-ea028ac92541ac30bf202ed94cb53eec2ea0c9d6.tar.gz kernel_samsung_crespo-ea028ac92541ac30bf202ed94cb53eec2ea0c9d6.tar.bz2 | |
nfs41: nfs41: fix state manager deadlock in session reset
If the session is reset during state recovery, the state manager thread can
sleep on the slot_tbl_waitq causing a deadlock.
Add a completion framework to the session. Have the state manager thread set
a new session state (NFS4CLNT_SESSION_DRAINING) and wait for the session slot
table to drain.
Signal the state manager thread in nfs41_sequence_free_slot when the
NFS4CLNT_SESSION_DRAINING bit is set and the session is drained.
Reported-by: Trond Myklebust <trond@netapp.com>
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/nfs4state.c')
| -rw-r--r-- | fs/nfs/nfs4state.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c index f56f6be..3c14335 100644 --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -1181,8 +1181,23 @@ static void nfs4_session_recovery_handle_error(struct nfs_client *clp, int err) static int nfs4_reset_session(struct nfs_client *clp) { + struct nfs4_session *ses = clp->cl_session; + struct nfs4_slot_table *tbl = &ses->fc_slot_table; int status; + INIT_COMPLETION(ses->complete); + spin_lock(&tbl->slot_tbl_lock); + if (tbl->highest_used_slotid != -1) { + set_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state); + spin_unlock(&tbl->slot_tbl_lock); + status = wait_for_completion_interruptible(&ses->complete); + clear_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state); + if (status) /* -ERESTARTSYS */ + goto out; + } else { + spin_unlock(&tbl->slot_tbl_lock); + } + status = nfs4_proc_destroy_session(clp->cl_session); if (status && status != -NFS4ERR_BADSESSION && status != -NFS4ERR_DEADSESSION) { |