diff options
| author | Trond Myklebust <trond.myklebust@hammerspace.com> | 2023-09-18 02:05:50 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-10-10 22:53:38 +0300 |
| commit | 225cd4f67bd4c2c6541e7021dd4ebe0ca23d1994 (patch) | |
| tree | 894529a8160895a3be4611c9dff14d1f7bf50aea | |
| parent | d8f2ba9ec3582ef83e2f3050e4a7c83c1e7d9d17 (diff) | |
| download | linux-225cd4f67bd4c2c6541e7021dd4ebe0ca23d1994.tar.xz | |
NFSv4: Fix a nfs4_state_manager() race
[ Upstream commit ed1cc05aa1f7fe8197d300e914afc28ab9818f89 ]
If the NFS4CLNT_RUN_MANAGER flag got set just before we cleared
NFS4CLNT_MANAGER_RUNNING, then we might have won the race against
nfs4_schedule_state_manager(), and are responsible for handling the
recovery situation.
Fixes: aeabb3c96186 ("NFSv4: Fix a NFSv4 state manager deadlock")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | fs/nfs/nfs4state.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c index 10946b24c66f..afb617a4a7e4 100644 --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -2690,6 +2690,13 @@ static void nfs4_state_manager(struct nfs_client *clp) nfs4_end_drain_session(clp); nfs4_clear_state_manager_bit(clp); + if (test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) && + !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, + &clp->cl_state)) { + memflags = memalloc_nofs_save(); + continue; + } + if (!test_and_set_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state)) { if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { nfs_client_return_marked_delegations(clp); |