linux-kernel - [PATCH] NFSD, VFS: Remove dead code in nfsd

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Date:	Sun, 6 Mar 2011 00:30:35 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	linux-nfs@...r.kernel.org
cc:	linux-kernel@...r.kernel.org, Neil Brown <neilb@...e.de>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Trond Myklebust <Trond.Myklebust@...app.com>
Subject: [PATCH] NFSD, VFS: Remove dead code in nfsd_rename()

Currently we have the following code in fs/nfsd/vfs.c::nfsd_rename() :

	...
	host_err = nfsd_break_lease(odentry->d_inode);
	if (host_err)
		goto out_drop_write;
	if (ndentry->d_inode) {
		host_err = nfsd_break_lease(ndentry->d_inode);
		if (host_err)
			goto out_drop_write;
	}
	if (host_err)
		goto out_drop_write;
	...

'host_err' is guaranteed to be 0 by the time we test 'ndentry->d_inode'. 
If 'host_err' becomes != 0 inside the 'if' statement, then we goto 
'out_drop_write'. So, after the 'if' statement there is no way that 
'host_err' can be anything but 0, so the test afterwards is just dead 
code.
This patch removes the dead code.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 vfs.c |    2 --
 1 file changed, 2 deletions(-)

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index da1d970..9cc626b 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1749,8 +1749,6 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
 		if (host_err)
 			goto out_drop_write;
 	}
-	if (host_err)
-		goto out_drop_write;
 	host_err = vfs_rename(fdir, odentry, tdir, ndentry);
 	if (!host_err) {
 		host_err = commit_metadata(tfhp);


-- 
Jesper Juhl <jj@...osbits.net>            http://www.chaosbits.net/
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