linux-ext4 - Re: [Jfs-discussion] [PATCH 1/4] vfs: create a generic checking function for FS_IOC

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Date:   Tue, 11 Jun 2019 17:35:38 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Dave Kleikamp <dave.kleikamp@...cle.com>
Cc:     matthew.garrett@...ula.com, yuchao0@...wei.com, tytso@....edu,
        shaggy@...nel.org, ard.biesheuvel@...aro.org, josef@...icpanda.com,
        clm@...com, adilger.kernel@...ger.ca, jk@...abs.org, jack@...e.com,
        dsterba@...e.com, jaegeuk@...nel.org, viro@...iv.linux.org.uk,
        linux-xfs@...r.kernel.org, jfs-discussion@...ts.sourceforge.net,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        reiserfs-devel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-nilfs@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-btrfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, ocfs2-devel@....oracle.com
Subject: Re: [Jfs-discussion] [PATCH 1/4] vfs: create a generic checking
 function for FS_IOC_SETFLAGS

On Tue, Jun 11, 2019 at 08:41:06AM -0500, Dave Kleikamp wrote:
> On 6/10/19 11:45 PM, Darrick J. Wong wrote:
> > From: Darrick J. Wong <darrick.wong@...cle.com>
> > 
> > Create a generic checking function for the incoming FS_IOC_SETFLAGS flag
> > values so that we can standardize the implementations that follow ext4's
> > flag values.
> > 
> > Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
> 
>  -- clip --
> 
> > diff --git a/fs/jfs/ioctl.c b/fs/jfs/ioctl.c
> > index ba34dae8bd9f..c8446d2cd0c7 100644
> > --- a/fs/jfs/ioctl.c
> > +++ b/fs/jfs/ioctl.c
> > @@ -98,6 +98,12 @@ long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> >  		/* Lock against other parallel changes of flags */
> >  		inode_lock(inode);
> >  
> > +		oldflags = jfs_map_ext2(jfs_inode->mode2 & JFS_FL_USER_VISIBLE,
> > +					0);
> > +		err = vfs_ioc_setflags_check(inode, oldflags, flags);
> > +		if (err)
> > +			goto setflags_out;
> 
> inode_unlock(inode) is not called on the error path.
> 
> > +
> >  		oldflags = jfs_inode->mode2;
> >  
> >  		/*
> 
> This patch leaves jfs's open-coded version of the same check.

Heh, thanks for pointing that out.  I'll fix both of those things.

--D

> Thanks,
> Shaggy