linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: convert inline_data in prior to i_size

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Message-ID: <20190901072529.GB49907@jaegeuk-macbookpro.roam.corp.google.com>
Date:   Sun, 1 Sep 2019 00:25:29 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH] f2fs: convert inline_data in prior to
 i_size_write

On 08/31, Chao Yu wrote:
> On 2019/8/30 23:34, Jaegeuk Kim wrote:
> > This can guarantee inline_data has smaller i_size.
> 
> So I guess "f2fs: fix to avoid corruption during inline conversion" didn't fix
> such corruption right, I guess checkpoint & SPO before i_size recovery will
> cause this issue?
> 
> 	err = f2fs_convert_inline_inode(inode);
> 	if (err) {
> 
> -->

Yup, I think so.

> 
> 		/* recover old i_size */
> 		i_size_write(inode, old_size);
> 		return err;
> 
> > 
> > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> 
> Reviewed-by: Chao Yu <yuchao0@...wei.com>
> 
> > ---
> >  fs/f2fs/file.c | 25 +++++++++----------------
> >  1 file changed, 9 insertions(+), 16 deletions(-)
> > 
> > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> > index 08caaead6f16..a43193dd27cb 100644
> > --- a/fs/f2fs/file.c
> > +++ b/fs/f2fs/file.c
> > @@ -815,14 +815,20 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
> >  
> >  	if (attr->ia_valid & ATTR_SIZE) {
> >  		loff_t old_size = i_size_read(inode);
> > -		bool to_smaller = (attr->ia_size <= old_size);
> > +
> > +		if (attr->ia_size > MAX_INLINE_DATA(inode)) {
> > +			/* should convert inline inode here */
> 
> Would it be better:
> 
> /* should convert inline inode here in piror to i_size_write to avoid
> inconsistent status in between inline flag and i_size */

Put like this.

+                       /*
+                        * should convert inline inode before i_size_write to
+                        * keep smaller than inline_data size with inline flag.
+                        */

> 
> Thanks,
> 
> > +			err = f2fs_convert_inline_inode(inode);
> > +			if (err)
> > +				return err;
> > +		}
> >  
> >  		down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
> >  		down_write(&F2FS_I(inode)->i_mmap_sem);
> >  
> >  		truncate_setsize(inode, attr->ia_size);
> >  
> > -		if (to_smaller)
> > +		if (attr->ia_size <= old_size)
> >  			err = f2fs_truncate(inode);
> >  		/*
> >  		 * do not trim all blocks after i_size if target size is
> > @@ -830,24 +836,11 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
> >  		 */
> >  		up_write(&F2FS_I(inode)->i_mmap_sem);
> >  		up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
> > -
> >  		if (err)
> >  			return err;
> >  
> > -		if (!to_smaller) {
> > -			/* should convert inline inode here */
> > -			if (!f2fs_may_inline_data(inode)) {
> > -				err = f2fs_convert_inline_inode(inode);
> > -				if (err) {
> > -					/* recover old i_size */
> > -					i_size_write(inode, old_size);
> > -					return err;
> > -				}
> > -			}
> > -			inode->i_mtime = inode->i_ctime = current_time(inode);
> > -		}
> > -
> >  		down_write(&F2FS_I(inode)->i_sem);
> > +		inode->i_mtime = inode->i_ctime = current_time(inode);
> >  		F2FS_I(inode)->last_disk_size = i_size_read(inode);
> >  		up_write(&F2FS_I(inode)->i_sem);
> >  	}
> >