* [PATCH 1/2] NFSv4: Don't exit the state manager without clearing NFS4CLNT_MANAGER_RUNNING
@ 2018-11-08 17:35 Trond Myklebust
2018-11-08 17:35 ` [PATCH 2/2] NFSv4: Ensure that the state manager exits the loop on SIGKILL Trond Myklebust
0 siblings, 1 reply; 2+ messages in thread
From: Trond Myklebust @ 2018-11-08 17:35 UTC (permalink / raw)
To: linux-nfs
If we exit the NFSv4 state manager due to a umount, then we can end up
leaving the NFS4CLNT_MANAGER_RUNNING flag set. If another mount causes
the nfs4_client to be rereferenced before it is destroyed, then we end
up never being able to recover state.
Fixes: 47c2199b6eb5 ("NFSv4.1: Ensure state manager thread dies on last ...")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # v4.15+
---
fs/nfs/nfs4state.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 62ae0fd345ad..98d1b6a6646a 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -2601,11 +2601,12 @@ static void nfs4_state_manager(struct nfs_client *clp)
nfs4_clear_state_manager_bit(clp);
/* Did we race with an attempt to give us more work? */
if (clp->cl_state == 0)
- break;
+ return;
if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
- break;
+ return;
} while (refcount_read(&clp->cl_count) > 1);
- return;
+ goto out_drain;
+
out_error:
if (strlen(section))
section_sep = ": ";
@@ -2613,6 +2614,7 @@ static void nfs4_state_manager(struct nfs_client *clp)
" with error %d\n", section_sep, section,
clp->cl_hostname, -status);
ssleep(1);
+out_drain:
nfs4_end_drain_session(clp);
nfs4_clear_state_manager_bit(clp);
}
--
2.19.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH 2/2] NFSv4: Ensure that the state manager exits the loop on SIGKILL
2018-11-08 17:35 [PATCH 1/2] NFSv4: Don't exit the state manager without clearing NFS4CLNT_MANAGER_RUNNING Trond Myklebust
@ 2018-11-08 17:35 ` Trond Myklebust
0 siblings, 0 replies; 2+ messages in thread
From: Trond Myklebust @ 2018-11-08 17:35 UTC (permalink / raw)
To: linux-nfs
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
fs/nfs/nfs4state.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 98d1b6a6646a..ffea57885394 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -2604,7 +2604,7 @@ static void nfs4_state_manager(struct nfs_client *clp)
return;
if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
return;
- } while (refcount_read(&clp->cl_count) > 1);
+ } while (refcount_read(&clp->cl_count) > 1 && !signalled());
goto out_drain;
out_error:
--
2.19.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
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