NFSv4: Return the delegation if the server returns NFS4ERR_OPENMODE

commit 3114ea7a24d3264c090556a2444fc6d2c06176d4 upstream.

If a setattr() fails because of an NFS4ERR_OPENMODE error, it is
probably due to us holding a read delegation. Ensure that the
recovery routines return that delegation in this case.

Reported-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 414ed1d27c95076fbb0b50fbcda5e1ae9a94f83c..e1c1365ba832d0c4066fe3326d8388bdfb98bef0 100644 (file)
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -209,6 +209,7 @@ struct nfs4_exception {
        long timeout;
        int retry;
        struct nfs4_state *state;
+       struct inode *inode;
 };
 
 struct nfs4_state_recovery_ops {

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index ae317fd9d24eaf51b0387afe57d73dcf5a55af4c..301b0c95dcb91b455a351b9e17788d77f1fab313 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -254,18 +254,28 @@ static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struc
 {
        struct nfs_client *clp = server->nfs_client;
        struct nfs4_state *state = exception->state;
+       struct inode *inode = exception->inode;
        int ret = errorcode;
 
        exception->retry = 0;
        switch(errorcode) {
                case 0:
                        return 0;
+               case -NFS4ERR_OPENMODE:
+                       if (nfs_have_delegation(inode, FMODE_READ)) {
+                               nfs_inode_return_delegation(inode);
+                               exception->retry = 1;
+                               return 0;
+                       }
+                       if (state == NULL)
+                               break;
+                       nfs4_schedule_stateid_recovery(server, state);
+                       goto wait_on_recovery;
                case -NFS4ERR_DELEG_REVOKED:
                case -NFS4ERR_ADMIN_REVOKED:
                case -NFS4ERR_BAD_STATEID:
                        if (state != NULL)
                                nfs_remove_bad_delegation(state->inode);
-               case -NFS4ERR_OPENMODE:
                        if (state == NULL)
                                break;
                        nfs4_schedule_stateid_recovery(server, state);
@@ -1870,6 +1880,7 @@ static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
        struct nfs_server *server = NFS_SERVER(inode);
        struct nfs4_exception exception = {
                .state = state,
+               .inode = inode,
        };
        int err;
        do {