[PATCH] knfsd: nfsd4: simplify migration op check

I'm not too fond of these big if conditions.  Replace them by checks of a flag
in the operation descriptor.  To my eye this makes the code a bit more
self-documenting, and makes the complicated part of the code (proc_compound) a
little more compact.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/nfsd/nfs4proc.c

@@ -802,6 +802,8 @@ typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 struct nfsd4_operation {
 	nfsd4op_func op_func;
 	u32 op_flags;
+/* GETATTR and ops not listed as returning NFS4ERR_MOVED: */
+#define ALLOWED_ON_ABSENT_FS 1
 };
 
 static struct nfsd4_operation nfsd4_ops[];
@@ -887,17 +889,8 @@ nfsd4_proc_compound(struct svc_rqst *rqstp,
 				op->status = nfserr_nofilehandle;
 				goto encode_op;
 			}
-		}
-		/* Check must be done at start of each operation, except
-		 * for GETATTR and ops not listed as returning NFS4ERR_MOVED
-		 */
-		else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
-			 !((op->opnum == OP_GETATTR) ||
-			   (op->opnum == OP_PUTROOTFH) ||
-			   (op->opnum == OP_PUTPUBFH) ||
-			   (op->opnum == OP_RENEW) ||
-			   (op->opnum == OP_SETCLIENTID) ||
-			   (op->opnum == OP_RELEASE_LOCKOWNER))) {
+		} else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
+			  !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
 			op->status = nfserr_moved;
 			goto encode_op;
 		}
@@ -951,6 +944,7 @@ static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = {
 	},
 	[OP_GETATTR] = {
 		.op_func = (nfsd4op_func)nfsd4_getattr,
+		.op_flags = ALLOWED_ON_ABSENT_FS,
 	},
 	[OP_GETFH] = {
 		.op_func = (nfsd4op_func)nfsd4_getfh,
@@ -988,8 +982,13 @@ static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = {
 	[OP_PUTFH] = {
 		.op_func = (nfsd4op_func)nfsd4_putfh,
 	},
+	[OP_PUTPUBFH] = {
+		/* unsupported; just for future reference: */
+		.op_flags = ALLOWED_ON_ABSENT_FS,
+	},
 	[OP_PUTROOTFH] = {
 		.op_func = (nfsd4op_func)nfsd4_putrootfh,
+		.op_flags = ALLOWED_ON_ABSENT_FS,
 	},
 	[OP_READ] = {
 		.op_func = (nfsd4op_func)nfsd4_read,
@@ -1008,6 +1007,7 @@ static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = {
 	},
 	[OP_RENEW] = {
 		.op_func = (nfsd4op_func)nfsd4_renew,
+		.op_flags = ALLOWED_ON_ABSENT_FS,
 	},
 	[OP_RESTOREFH] = {
 		.op_func = (nfsd4op_func)nfsd4_restorefh,
@@ -1020,6 +1020,7 @@ static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = {
 	},
 	[OP_SETCLIENTID] = {
 		.op_func = (nfsd4op_func)nfsd4_setclientid,
+		.op_flags = ALLOWED_ON_ABSENT_FS,
 	},
 	[OP_SETCLIENTID_CONFIRM] = {
 		.op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
@@ -1032,6 +1033,7 @@ static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = {
 	},
 	[OP_RELEASE_LOCKOWNER] = {
 		.op_func = (nfsd4op_func)nfsd4_release_lockowner,
+		.op_flags = ALLOWED_ON_ABSENT_FS,
 	},
 };