nfs41: check SEQUENCE status flag

the server can indicate a number of error conditions by setting the
appropriate bits in the SEQUENCE operation. The client re-establishes
state with the server when it receives one of those, with the action
depending on the specific case.

Signed-off-by: Alexandros Batsakis <batsakis@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 0d25a82..9a86636 100644 (file)
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -270,6 +270,7 @@ extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 extern void nfs4_schedule_state_recovery(struct nfs_client *);
 extern void nfs4_schedule_state_manager(struct nfs_client *);
 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state);
+extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 extern void nfs4_copy_stateid(nfs4_stateid *, struct nfs4_state *, fl_owner_t);

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index d897b9e..71993f1 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -405,6 +405,8 @@ static void nfs41_sequence_done(struct nfs_client *clp,
                if (time_before(clp->cl_last_renewal, timestamp))
                        clp->cl_last_renewal = timestamp;
                spin_unlock(&clp->cl_lock);
+               /* Check sequence flags */
+               nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
                return;
        }
 out:

diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 46c69e2..a86f3ac 100644 (file)
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1173,6 +1173,28 @@ static int nfs4_reclaim_lease(struct nfs_client *clp)
 }
 
 #ifdef CONFIG_NFS_V4_1
+void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
+{
+       if (!flags)
+               return;
+       else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) {
+               set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
+               nfs4_state_start_reclaim_reboot(clp);
+               nfs4_schedule_state_recovery(clp);
+       } else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
+                           SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
+                           SEQ4_STATUS_ADMIN_STATE_REVOKED |
+                           SEQ4_STATUS_RECALLABLE_STATE_REVOKED |
+                           SEQ4_STATUS_LEASE_MOVED)) {
+               set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
+               nfs4_state_start_reclaim_nograce(clp);
+               nfs4_schedule_state_recovery(clp);
+       } else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
+                           SEQ4_STATUS_BACKCHANNEL_FAULT |
+                           SEQ4_STATUS_CB_PATH_DOWN_SESSION))
+               nfs_expire_all_delegations(clp);
+}
+
 static void nfs4_session_recovery_handle_error(struct nfs_client *clp, int err)
 {
        switch (err) {

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 4ddd04a..f740472 100644 (file)
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -4614,8 +4614,8 @@ static int decode_sequence(struct xdr_stream *xdr,
        dummy = be32_to_cpup(p++);
        /* target highest slot id - currently not processed */
        dummy = be32_to_cpup(p++);
-       /* result flags - currently not processed */
-       dummy = be32_to_cpup(p);
+       /* result flags */
+       res->sr_status_flags = be32_to_cpup(p);
        status = 0;
 out_err:
        res->sr_status = status;

diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index c4c0602..89404bf 100644 (file)
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -128,6 +128,8 @@
 #define SEQ4_STATUS_RECALLABLE_STATE_REVOKED   0x00000040
 #define SEQ4_STATUS_LEASE_MOVED                        0x00000080
 #define SEQ4_STATUS_RESTART_RECLAIM_NEEDED     0x00000100
+#define SEQ4_STATUS_CB_PATH_DOWN_SESSION       0x00000200
+#define SEQ4_STATUS_BACKCHANNEL_FAULT          0x00000400
 
 #define NFS4_MAX_UINT64        (~(u64)0)
 

diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 8c88037..ea32db3 100644 (file)
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -172,6 +172,7 @@ struct nfs4_sequence_res {
        u8                      sr_slotid;      /* slot used to send request */
        int                     sr_status;      /* sequence operation status */
        unsigned long           sr_renewal_time;
+       u32                     sr_status_flags;
 };
 
 struct nfs4_get_lease_time_args {