NFSv4/pnfs: Don't switch off layoutget-on-open for transient errors

Ensure that we only switch off the LAYOUTGET operation in the OPEN
compound when the server is truly broken, and/or it is complaining
that the compound is too large.
Currently, we end up turning off the functionality permanently,
even for transient errors such as EACCES or ENOSPC.

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

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 4d3f04d..d5dc97f 100644 (file)
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -2111,14 +2111,22 @@ void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
        dprintk("%s: entered with status %i\n", __func__, lgp->res.status);
        if (lgp->res.status) {
                switch (lgp->res.status) {
-               case -NFS4ERR_DELAY:
-               case -NFS4ERR_GRACE:
-               case -NFS4ERR_LAYOUTTRYLATER:
-                       break;
                default:
-                       /* FIXME - Any error not listed above permanently
-                        * halts lgopen attempts.
-                        */
+                       break;
+               /*
+                * Halt lgopen attempts if the server doesn't recognise
+                * the "current stateid" value, the layout type, or the
+                * layoutget operation as being valid.
+                * Also if it complains about too many ops in the compound
+                * or of the request/reply being too big.
+                */
+               case -NFS4ERR_BAD_STATEID:
+               case -NFS4ERR_NOTSUPP:
+               case -NFS4ERR_REP_TOO_BIG:
+               case -NFS4ERR_REP_TOO_BIG_TO_CACHE:
+               case -NFS4ERR_REQ_TOO_BIG:
+               case -NFS4ERR_TOO_MANY_OPS:
+               case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
                        srv->caps &= ~NFS_CAP_LGOPEN;
                }
                return;