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From: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
To: Al Viro <viro@zeniv.linux.org.uk>
Cc: "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"pali@kernel.org" <pali@kernel.org>,
	"dsterba@suse.cz" <dsterba@suse.cz>,
	"aaptel@suse.com" <aaptel@suse.com>,
	"willy@infradead.org" <willy@infradead.org>,
	"rdunlap@infradead.org" <rdunlap@infradead.org>,
	"joe@perches.com" <joe@perches.com>,
	"mark@harmstone.com" <mark@harmstone.com>
Subject: RE: [PATCH v3 04/10] fs/ntfs3: Add file operations and implementation
Date: Fri, 4 Sep 2020 12:41:24 +0000	[thread overview]
Message-ID: <d82dae3c12d94db7a2a212a8b8b79e8b@paragon-software.com> (raw)
In-Reply-To: <20200828154544.GJ1236603@ZenIV.linux.org.uk>

From: Al Viro <viro@ftp.linux.org.uk>
Sent: Friday, August 28, 2020 6:46 PM
> On Fri, Aug 28, 2020 at 07:39:32AM -0700, Konstantin Komarov wrote:
> 
> > +static struct dentry *__ntfs_lookup(struct inode *dir, struct dentry *dentry,
> > +				    struct ntfs_fnd *fnd)
> > +{
> > +	struct dentry *d;
> > +	struct inode *inode;
> > +
> > +	inode = dir_search(dir, &dentry->d_name, fnd);
> > +
> > +	if (!inode) {
> > +		d_add(dentry, NULL);
> > +		d = NULL;
> > +		goto out;
> > +	}
> > +
> > +	if (IS_ERR(inode)) {
> > +		d = ERR_CAST(inode);
> > +		goto out;
> > +	}
> > +
> > +	d = d_splice_alias(inode, dentry);
> > +	if (IS_ERR(d)) {
> > +		iput(inode);
> > +		goto out;
> > +	}
> > +
> > +out:
> > +	return d;
> > +}
> 
> This is bollocks.  First and foremost, d_splice_alias() *does* iput() on
> failure, so you've got double-put there.  What's more
> 	* d_splice_alias(ERR_PTR(err), dentry) return err
> 	* d_splice_alias(NULL, dentry) is equivalent to d_add(dentry, NULL) and returns NULL
> 
> IOW, all that boilerplate could be replaced with one line:
> 
> 	return d_splice_alias(dir_search(dir, &dentry->d_name, fnd), dentry);

Hi Al! Agreed. Will be fixed in v4.
Thanks.

  reply	other threads:[~2020-09-04 12:42 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-28 14:39 [PATCH v3 00/10] NTFS read-write driver GPL implementation by Paragon Software Konstantin Komarov
2020-08-28 14:39 ` [PATCH v3 01/10] fs/ntfs3: Add headers and misc files Konstantin Komarov
2020-08-28 14:39 ` [PATCH v3 02/10] fs/ntfs3: Add initialization of super block Konstantin Komarov
2020-09-04 12:06   ` Pali Rohár
2020-09-11 16:59     ` Konstantin Komarov
2020-08-28 14:39 ` [PATCH v3 03/10] fs/ntfs3: Add bitmap Konstantin Komarov
2020-08-28 14:39 ` [PATCH v3 04/10] fs/ntfs3: Add file operations and implementation Konstantin Komarov
2020-08-28 15:45   ` Al Viro
2020-09-04 12:41     ` Konstantin Komarov [this message]
2020-08-28 15:55   ` Al Viro
2020-09-04 12:49     ` Konstantin Komarov
2020-09-04 11:50   ` Pali Rohár
2020-09-11 16:52     ` Konstantin Komarov
2020-09-21 13:36       ` Pali Rohár
2020-09-22 10:26         ` Aurélien Aptel
2020-09-25 16:39         ` Konstantin Komarov
2020-08-28 14:39 ` [PATCH v3 05/10] fs/ntfs3: Add attrib operations Konstantin Komarov
2020-08-28 16:14   ` Mark Harmstone
2020-08-28 14:39 ` [PATCH v3 06/10] fs/ntfs3: Add compression Konstantin Komarov
2020-08-28 14:39 ` [PATCH v3 07/10] fs/ntfs3: Add NTFS journal Konstantin Komarov
2020-08-28 14:39 ` [PATCH v3 08/10] fs/ntfs3: Add Kconfig, Makefile and doc Konstantin Komarov
2020-08-28 14:39 ` [PATCH v3 09/10] fs/ntfs3: Add NTFS3 in fs/Kconfig and fs/Makefile Konstantin Komarov
2020-09-01  0:37   ` kernel test robot
2020-09-01  4:45   ` kernel test robot
2020-08-28 14:39 ` [PATCH v3 10/10] fs/ntfs3: Add MAINTAINERS Konstantin Komarov
2020-08-29 11:31 ` [PATCH v3 00/10] NTFS read-write driver GPL implementation by Paragon Software Nikolay Borisov
2020-09-04 12:55   ` Konstantin Komarov

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