pNFS: Handle NFS4ERR_OLD_STATEID correctly in LAYOUTSTAT calls

We normally want to update the stateid and then retry,

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 6f47527..64b43b4 100644 (file)
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -318,10 +318,22 @@ static void
 nfs42_layoutstat_prepare(struct rpc_task *task, void *calldata)
 {
        struct nfs42_layoutstat_data *data = calldata;
-       struct nfs_server *server = NFS_SERVER(data->args.inode);
+       struct inode *inode = data->inode;
+       struct nfs_server *server = NFS_SERVER(inode);
+       struct pnfs_layout_hdr *lo;
 
+       spin_lock(&inode->i_lock);
+       lo = NFS_I(inode)->layout;
+       if (!pnfs_layout_is_valid(lo)) {
+               spin_unlock(&inode->i_lock);
+               rpc_exit(task, 0);
+               return;
+       }
+       nfs4_stateid_copy(&data->args.stateid, &lo->plh_stateid);
+       spin_unlock(&inode->i_lock);
        nfs41_setup_sequence(nfs4_get_session(server), &data->args.seq_args,
                             &data->res.seq_res, task);
+
 }
 
 static void
@@ -341,11 +353,11 @@ nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
        case -NFS4ERR_ADMIN_REVOKED:
        case -NFS4ERR_DELEG_REVOKED:
        case -NFS4ERR_STALE_STATEID:
-       case -NFS4ERR_OLD_STATEID:
        case -NFS4ERR_BAD_STATEID:
                spin_lock(&inode->i_lock);
                lo = NFS_I(inode)->layout;
-               if (lo && nfs4_stateid_match(&data->args.stateid,
+               if (pnfs_layout_is_valid(lo) &&
+                   nfs4_stateid_match(&data->args.stateid,
                                             &lo->plh_stateid)) {
                        LIST_HEAD(head);
 
@@ -359,11 +371,23 @@ nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
                } else
                        spin_unlock(&inode->i_lock);
                break;
+       case -NFS4ERR_OLD_STATEID:
+               spin_lock(&inode->i_lock);
+               lo = NFS_I(inode)->layout;
+               if (pnfs_layout_is_valid(lo) &&
+                   nfs4_stateid_match_other(&data->args.stateid,
+                                       &lo->plh_stateid)) {
+                       /* Do we need to delay before resending? */
+                       if (!nfs4_stateid_is_newer(&lo->plh_stateid,
+                                               &data->args.stateid))
+                               rpc_delay(task, HZ);
+                       rpc_restart_call_prepare(task);
+               }
+               spin_unlock(&inode->i_lock);
+               break;
        case -ENOTSUPP:
        case -EOPNOTSUPP:
                NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
-       default:
-               break;
        }
 
        dprintk("%s server returns %d\n", __func__, task->tk_status);

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 70806ca..bf98f1b 100644 (file)
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -2510,7 +2510,6 @@ pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
 
        data->args.fh = NFS_FH(inode);
        data->args.inode = inode;
-       nfs4_stateid_copy(&data->args.stateid, &hdr->plh_stateid);
        status = ld->prepare_layoutstats(&data->args);
        if (status)
                goto out_free;