[PATCH 16/16] nfsd4: simplify filehandle check

[J. Bruce Fields]

From: J. Bruce Fields <bfields at fieldses.org>

Kill another big "if" clause.

Signed-off-by: J. Bruce Fields <bfields at citi.umich.edu>
---

 fs/nfsd/nfs4proc.c |   29 ++++++++++++-----------------
 1 files changed, 12 insertions(+), 17 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index afab04c..b88ec10 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -766,8 +766,10 @@ typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 struct nfsd4_operation {
 	nfsd4op_func op_func;
 	u32 op_flags;
+/* Most ops require a valid current filehandle; a few don't: */
+#define ALLOWED_WITHOUT_FH 1
 /* GETATTR and ops not listed as returning NFS4ERR_MOVED: */
-#define ALLOWED_ON_ABSENT_FS 1
+#define ALLOWED_ON_ABSENT_FS 2
 };
 
 static struct nfsd4_operation nfsd4_ops[];
@@ -838,18 +840,8 @@ nfsd4_proc_compound(struct svc_rqst *rqstp,
 
 		opdesc = &nfsd4_ops[op->opnum];
 
-		/* All operations except RENEW, SETCLIENTID, RESTOREFH
-		* SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH
-		* require a valid current filehandle
-		*/
 		if (!cstate->current_fh.fh_dentry) {
-			if (!((op->opnum == OP_PUTFH) ||
-			      (op->opnum == OP_PUTROOTFH) ||
-			      (op->opnum == OP_SETCLIENTID) ||
-			      (op->opnum == OP_SETCLIENTID_CONFIRM) ||
-			      (op->opnum == OP_RENEW) ||
-			      (op->opnum == OP_RESTOREFH) ||
-			      (op->opnum == OP_RELEASE_LOCKOWNER))) {
+			if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
 				op->status = nfserr_nofilehandle;
 				goto encode_op;
 			}
@@ -945,14 +937,15 @@ static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = {
 	},
 	[OP_PUTFH] = {
 		.op_func = (nfsd4op_func)nfsd4_putfh,
+		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
 	},
 	[OP_PUTPUBFH] = {
 		/* unsupported; just for future reference: */
-		.op_flags = ALLOWED_ON_ABSENT_FS,
+		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
 	},
 	[OP_PUTROOTFH] = {
 		.op_func = (nfsd4op_func)nfsd4_putrootfh,
-		.op_flags = ALLOWED_ON_ABSENT_FS,
+		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
 	},
 	[OP_READ] = {
 		.op_func = (nfsd4op_func)nfsd4_read,
@@ -971,10 +964,11 @@ 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_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
 	},
 	[OP_RESTOREFH] = {
 		.op_func = (nfsd4op_func)nfsd4_restorefh,
+		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
 	},
 	[OP_SAVEFH] = {
 		.op_func = (nfsd4op_func)nfsd4_savefh,
@@ -984,10 +978,11 @@ 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_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
 	},
 	[OP_SETCLIENTID_CONFIRM] = {
 		.op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
+		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
 	},
 	[OP_VERIFY] = {
 		.op_func = (nfsd4op_func)nfsd4_verify,
@@ -997,7 +992,7 @@ 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,
+		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
 	},
 };