linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: fix to convert inline inode in ->setattr

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Message-ID: <20151204211833.GA73535@jaegeuk.local>
Date:	Fri, 4 Dec 2015 13:18:33 -0800
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	Chao Yu <chao2.yu@...sung.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH] f2fs: fix to convert inline inode in ->setattr

On Fri, Dec 04, 2015 at 12:55:23PM -0800, Jaegeuk Kim wrote:
> Hi Chao,
> 
> On Tue, Dec 01, 2015 at 11:36:16AM +0800, Chao Yu wrote:
> > In commit 3c4541452748 ("f2fs: do not trim preallocated blocks when
> > truncating after i_size"), in order to follow the regulation: "truncate(x)
> > where x > i_size will not trim all blocks past i_size." like other file
> > systems, in ->setattr we invoked truncate_setsize instead of f2fs_truncate
> > to avoid unneeded block trimming in such case, but forgot to call
> > f2fs_convert_inline_inode keep consistency of inline data conversion rule.
> > 
> > This patch fixes to convert inline data if necessary.
> > 
> > Signed-off-by: Chao Yu <chao2.yu@...sung.com>
> > ---
> >  fs/f2fs/file.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> > index 96e4e04..a018ed3 100644
> > --- a/fs/f2fs/file.c
> > +++ b/fs/f2fs/file.c
> > @@ -686,6 +686,14 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
> >  			 * larger than i_size.
> >  			 */
> >  			truncate_setsize(inode, attr->ia_size);
> > +
> > +			/* should convert inline inode here */
> > +			if (f2fs_has_inline_data(inode) &&
> > +					!f2fs_may_inline_data(inode)) {
> > +				err = f2fs_convert_inline_inode(inode);
> > +				if (err)
> > +					return err;
> > +			}
> 
> Without this, f2fs handles correctly inline_data when user tries to write
> something later, right?
> 
> One corner case is:
> if the partiton is filled up to 100% with data + inline_data, we cannot truncate
> one of inline_data after merging this patch.
> Cause it failed to convert it.

Oh, it turns out this is due to the error handling -ENOSPC of f2fs_truncate.
For now, it seems there is no easy workaround this.
Please ignore my concern. ;)

Thanks,

> 
> Thanks,
> 
> >  			inode->i_mtime = inode->i_ctime = CURRENT_TIME;
> >  		}
> >  	}
> > -- 
> > 2.6.3
> > 
> 
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