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Subject[069/129] nfsd4: fix lockowner matching
3.2-stable review patch.  If anyone has any objections, please let me know.

------------------
Content-Length: 1592
Lines: 53
From: "J. Bruce Fields" <bfields@redhat.com>

commit b93d87c19821ba7d3ee11557403d782e541071ad upstream.

Lockowners are looked up by file as well as by owner, but we were
forgetting to do a comparison on the file. This could cause an
incorrect result from lockt.

(Note looking up the inode from the lockowner is pretty awkward here.
The data structures need fixing.)

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
fs/nfsd/nfs4state.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3809,16 +3809,29 @@ nevermind:
deny->ld_type = NFS4_WRITE_LT;
}

+static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
+{
+ struct nfs4_ol_stateid *lst;
+
+ if (!same_owner_str(&lo->lo_owner, owner, clid))
+ return false;
+ lst = list_first_entry(&lo->lo_owner.so_stateids,
+ struct nfs4_ol_stateid, st_perstateowner);
+ return lst->st_file->fi_inode == inode;
+}
+
static struct nfs4_lockowner *
find_lockowner_str(struct inode *inode, clientid_t *clid,
struct xdr_netobj *owner)
{
unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
+ struct nfs4_lockowner *lo;
struct nfs4_stateowner *op;

list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
- if (same_owner_str(op, owner, clid))
- return lockowner(op);
+ lo = lockowner(op);
+ if (same_lockowner_ino(lo, inode, clid, owner))
+ return lo;
}
return NULL;
}



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