[PATCH 3.8 36/65] nfsd4: remove lockowner when removing lock stateid

From: Kamal Mostafa
Date: Tue Jun 24 2014 - 16:42:49 EST


3.8.13.25 -stable review patch. If anyone has any objections, please let me know.

------------------

From: "J. Bruce Fields" <bfields@xxxxxxxxxx>

commit a1b8ff4c97b4375d21b6d6c45d75877303f61b3b upstream.

The nfsv4 state code has always assumed a one-to-one correspondance
between lock stateid's and lockowners even if it appears not to in some
places.

We may actually change that, but for now when FREE_STATEID releases a
lock stateid it also needs to release the parent lockowner.

Symptoms were a subsequent LOCK crashing in find_lockowner_str when it
calls same_lockowner_ino on a lockowner that unexpectedly has an empty
so_stateids list.

Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
fs/nfsd/nfs4state.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index b2142f9..6acaeed 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3511,9 +3511,16 @@ out:
static __be32
nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
{
- if (check_for_locks(stp->st_file, lockowner(stp->st_stateowner)))
+ struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
+
+ if (check_for_locks(stp->st_file, lo))
return nfserr_locks_held;
- release_lock_stateid(stp);
+ /*
+ * Currently there's a 1-1 lock stateid<->lockowner
+ * correspondance, and we have to delete the lockowner when we
+ * delete the lock stateid:
+ */
+ unhash_lockowner(lo);
return nfs_ok;
}

--
1.9.1

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