From mboxrd@z Thu Jan 1 00:00:00 1970 From: Julia Lawall Date: Sun, 28 Dec 2014 21:01:28 +0000 Subject: Re: [PATCH 1/8] fs/9p: Deletion of unnecessary checks before the function call "p9_client_clunk" Message-Id: List-Id: References: <5307CAA2.8060406@users.sourceforge.net> <530A086E.8010901@users.sourceforge.net> <530A72AA.3000601@users.sourceforge.net> <530B5FB6.6010207@users.sourceforge.net> <530C5E18.1020800@users.sourceforge.net> <530CD2C4.4050903@users.sourceforge.net> <530CF8FF.8080600@users.sourceforge.net> <530DD06F.4090703@users.sourceforge.net> <5317A59D.4@users.sourceforge.net> <54A01326.3050306@users.sourceforge.net> <54A06AB9.4020505@users.sourceforge.net> In-Reply-To: <54A06AB9.4020505@users.sourceforge.net> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: SF Markus Elfring Cc: Eric Van Hensbergen , Latchesar Ionkov , Ron Minnich , v9fs-developer@lists.sourceforge.net, LKML , kernel-janitors@vger.kernel.org, Julia Lawall > diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c > index 9ee5343..a787d4c 100644 > --- a/fs/9p/vfs_inode.c > +++ b/fs/9p/vfs_inode.c > @@ -700,11 +700,9 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, > } > return ofid; > error: > - if (ofid) > - p9_client_clunk(ofid); > + p9_client_clunk(ofid); > > - if (fid) > - p9_client_clunk(fid); > + p9_client_clunk(fid); > > return ERR_PTR(err); > } This code seems rather sloppy. ofid could never be NULL at the point where it was tested. There is a useless definition of ofid to NULL at the top of the function. The error handling code could be rearranged with an extra error label so that p9_client_clunk is never called on fid when it it is not defined. The the two assignments of fid to NULL could also be removed. There is also a useless initialization of err to 0 at the beginning of the function. And the first two calls to ERR_PTR are not needed, as the types of dfid and ofid are the same as the return type of the function. > @@ -768,8 +766,7 @@ static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode > v9fs_invalidate_inode_attr(dir); > } > > - if (fid) > - p9_client_clunk(fid); > + p9_client_clunk(fid); > > return err; > } This function is also unnecessarily complex. The if above this one, that detects the error could just return PTR_ERR(fid);. The rest of the function could call inc_nlink, v9fs_invalidate_inode_attr, and p9_client_clunk, and the returnvalue could be 0, removing the need for the err variable. > @@ -916,8 +913,7 @@ out: > return err; > > error: > - if (fid) > - p9_client_clunk(fid); > + p9_client_clunk(fid); > goto out; > } In the case where fid is set to NULL, it could just goto out directly, instead of calling p9_client_clunk, testing fid, coming back, and going to out anyway. julia > diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c > index 6054c16b..3611b0f 100644 > --- a/fs/9p/vfs_inode_dotl.c > +++ b/fs/9p/vfs_inode_dotl.c > @@ -363,11 +363,9 @@ out: > return err; > > error: > - if (fid) > - p9_client_clunk(fid); > + p9_client_clunk(fid); > err_clunk_old_fid: > - if (ofid) > - p9_client_clunk(ofid); > + p9_client_clunk(ofid); > goto out; > } > > @@ -464,8 +462,7 @@ static int v9fs_vfs_mkdir_dotl(struct inode *dir, > inc_nlink(dir); > v9fs_invalidate_inode_attr(dir); > error: > - if (fid) > - p9_client_clunk(fid); > + p9_client_clunk(fid); > v9fs_put_acl(dacl, pacl); > return err; > } > @@ -744,8 +741,7 @@ v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, > } > > error: > - if (fid) > - p9_client_clunk(fid); > + p9_client_clunk(fid); > > return err; > } > @@ -896,8 +892,7 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, > d_instantiate(dentry, inode); > } > error: > - if (fid) > - p9_client_clunk(fid); > + p9_client_clunk(fid); > v9fs_put_acl(dacl, pacl); > return err; > } > diff --git a/fs/9p/xattr.c b/fs/9p/xattr.c > index f95e01e..8e72269 100644 > --- a/fs/9p/xattr.c > +++ b/fs/9p/xattr.c > @@ -65,8 +65,7 @@ ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name, > /* Total read xattr bytes */ > retval = offset; > error: > - if (attr_fid) > - p9_client_clunk(attr_fid); > + p9_client_clunk(attr_fid); > return retval; > > } > -- > 2.2.1 > >