linux-kernel - Re: [PATCH v13 02/51] vfs: Add MAY_CREATE_FILE and MAY_CREATE

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Message-ID: <CAHc6FU7q1WOTk_XH+pYOU2=i_ranmtbney9epyFQuTi27qOaGQ@mail.gmail.com>
Date:	Wed, 4 Nov 2015 04:02:27 +0100
From:	Andreas Gruenbacher <agruenba@...hat.com>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	"Theodore Ts'o" <tytso@....edu>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Anna Schumaker <anna.schumaker@...app.com>,
	Dave Chinner <david@...morbit.com>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	XFS Developers <xfs@....sgi.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
	linux-cifs@...r.kernel.org, Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH v13 02/51] vfs: Add MAY_CREATE_FILE and MAY_CREATE_DIR
 permission flags

On Wed, Nov 4, 2015 at 3:33 AM, Andreas Dilger <adilger@...ger.ca> wrote:
> On Nov 3, 2015, at 8:16 AM, Andreas Gruenbacher <agruenba@...hat.com> wrote:
>> @@ -3667,7 +3674,7 @@ EXPORT_SYMBOL(dentry_unhash);
>>
>> int vfs_rmdir(struct inode *dir, struct dentry *dentry)
>> {
>> -     int error = may_delete(dir, dentry, 1);
>> +     int error = may_delete(dir, dentry, true, false);
>
> This is a prime example why passing "true" and "false" as function arguments
> is not very useful, and especially prone to bugs when there are two of them.
>
> That said, this is code originally from Al, so he may have a different
> opinion.

Have you checked how vfs_rename uses the is_dir and new_is_dir
variables? Using file modes there probably won't help readability. An
enum maybe?

Thanks,
Andreas
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