linux-kernel - Re: [f2fs-dev] [PATCH 2/3] f2fs: use i_size_read to get i

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Message-ID: <20151230005346.GE13809@jaegeuk.local>
Date:	Tue, 29 Dec 2015 16:53:47 -0800
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	Chao Yu <chao2.yu@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 2/3] f2fs: use i_size_read to get i_size

Hi Chao,

On Tue, Dec 29, 2015 at 05:18:19PM +0800, Chao Yu wrote:
> Hi Jaegeuk,
> 
> > -----Original Message-----
> > From: Jaegeuk Kim [mailto:jaegeuk@...nel.org]
> > Sent: Tuesday, December 29, 2015 7:32 AM
> > To: linux-kernel@...r.kernel.org; linux-fsdevel@...r.kernel.org;
> > linux-f2fs-devel@...ts.sourceforge.net
> > Cc: Jaegeuk Kim
> > Subject: [f2fs-dev] [PATCH 2/3] f2fs: use i_size_read to get i_size
> > 
> > We need to use i_size_read() to get inode->i_size.
> 
> All callers of f2fs_write_failed should be protected by i_mutex, so no
> one can change i_size, do we really need to use i_size_read here?

Just to follow convention and avoid any confusion later.
We also use i_size_read/write consistently across whole areas.

Thanks,

> 
> Thanks,
> 
> > 
> > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> > ---
> >  fs/f2fs/data.c | 7 ++++---
> >  1 file changed, 4 insertions(+), 3 deletions(-)
> > 
> > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> > index f34f42a..8a89810 100644
> > --- a/fs/f2fs/data.c
> > +++ b/fs/f2fs/data.c
> > @@ -1386,10 +1386,11 @@ skip_write:
> >  static void f2fs_write_failed(struct address_space *mapping, loff_t to)
> >  {
> >  	struct inode *inode = mapping->host;
> > +	loff_t i_size = i_size_read(inode);
> > 
> > -	if (to > inode->i_size) {
> > -		truncate_pagecache(inode, inode->i_size);
> > -		truncate_blocks(inode, inode->i_size, true);
> > +	if (to > i_size) {
> > +		truncate_pagecache(inode, i_size);
> > +		truncate_blocks(inode, i_size, true);
> >  	}
> >  }
> > 
> > --
> > 2.5.4 (Apple Git-61)
> > 
> > 
> > ------------------------------------------------------------------------------
> > _______________________________________________
> > Linux-f2fs-devel mailing list
> > Linux-f2fs-devel@...ts.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
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