[PATCH v3] NFSv3/acl: forget acl cache after setattr

[chendt <chendt.fnst@cn.fujitsu.com>]

Sync of ACL with std permissions fail，We need to forget the ACL cache after setattr.

Reproduction:
#!/bin/bash
touch testfile
cat <<EOF >testfile
#!/bin/bash
echo "Test was executed"
EOF
chmod u=rwx testfile
chmod g=rw- testfile
chmod o=r-- testfile

chacl u::r--,g::rwx,o:rw- testfile
chmod u+w testfile
ls -l testfile
chacl -l testfile

Output：
-rw-rwxrw- 1 root root 0 Mar 28 05:29 testfile
testfile [u::r--,g::rwx,o::rw-]

Signed-off-by: chendt.fnst <chendt.fnst@cn.fujitsu.com>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: Kinglong Mee <Kinglong Mee>

---
 fs/nfs/nfs3proc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index 7327930..29b6dbd 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -138,8 +138,11 @@
 		msg.rpc_cred = nfs_file_cred(sattr->ia_file);
 	nfs_fattr_init(fattr);
 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
-	if (status == 0)
+	if (status == 0) {
+		if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
+			nfs_zap_acl_cache(inode);
 		nfs_setattr_update_inode(inode, sattr, fattr);
+	}
 	dprintk("NFS reply setattr: %d\n", status);
 	return status;
 }
-- 
1.8.3.1