linux-kernel - [patch] nfsd: clean up mnt_want

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Message-Id: <E1KDg43-0005HY-QR@pomaz-ex.szeredi.hu>
Date:	Tue, 01 Jul 2008 15:38:35 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	bfields@...ldses.org
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, hch@...radead.org
Subject: [patch] nfsd: clean up mnt_want_write calls

From: Miklos Szeredi <mszeredi@...e.cz>

Multiple mnt_want_write() calls in the switch statement looks really
ugly.

Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
Acked-by: Christoph Hellwig <hch@...radead.org>
---
 fs/nfsd/vfs.c |   25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

Index: linux-2.6/fs/nfsd/vfs.c
===================================================================
--- linux-2.6.orig/fs/nfsd/vfs.c	2008-06-13 13:26:49.000000000 +0200
+++ linux-2.6/fs/nfsd/vfs.c	2008-06-13 13:26:52.000000000 +0200
@@ -1248,36 +1248,34 @@ nfsd_create(struct svc_rqst *rqstp, stru
 		iap->ia_mode = 0;
 	iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
 
+	err = nfserr_inval;
+	if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) {
+		printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n",
+		       type);
+		goto out;
+	}
+
+	host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
+	if (host_err)
+		goto out_nfserr;
+
 	/*
 	 * Get the dir op function pointer.
 	 */
 	err = 0;
 	switch (type) {
 	case S_IFREG:
-		host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
-		if (host_err)
-			goto out_nfserr;
 		host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
 		break;
 	case S_IFDIR:
-		host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
-		if (host_err)
-			goto out_nfserr;
 		host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
 		break;
 	case S_IFCHR:
 	case S_IFBLK:
 	case S_IFIFO:
 	case S_IFSOCK:
-		host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
-		if (host_err)
-			goto out_nfserr;
 		host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
 		break;
-	default:
-	        printk("nfsd: bad file type %o in nfsd_create\n", type);
-		host_err = -EINVAL;
-		goto out_nfserr;
 	}
 	if (host_err < 0) {
 		mnt_drop_write(fhp->fh_export->ex_path.mnt);
@@ -1289,7 +1287,6 @@ nfsd_create(struct svc_rqst *rqstp, stru
 		write_inode_now(dchild->d_inode, 1);
 	}
 
-
 	err2 = nfsd_create_setattr(rqstp, resfhp, iap);
 	if (err2)
 		err = err2;
--
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