linux-kernel - Re: [PATCH 1/1] fs/affs/file.c: unlock/release page on error

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Date:	Sat, 21 Mar 2015 16:05:04 -0400
From:	Taesoo Kim <taesoo@...ech.edu>
To:	Fabian Frederick <fabf@...net.be>
Cc:	akpm@...ux-foundation.org, Taesoo Kim <tsgatesv@...il.com>,
	linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
	jack@...e.cz, geert@...ux-m68k.org, linux-fsdevel@...r.kernel.org,
	csong84@...ech.edu, blee@...ech.edu, sanidhya@...ech.edu,
	changwoo@...ech.edu
Subject: Re: [PATCH 1/1] fs/affs/file.c: unlock/release page on error

Thank you for letting us know. We will definitely do it for
the next time. Thanks again for checking this out.

Taesoo

On 03/21/15 at 08:51pm, Fabian Frederick wrote:
> 
> 
> > On 21 March 2015 at 18:31 Taesoo Kim <tsgatesv@...il.com> wrote:
> >
> >
> > When affs_bread_ino() fails, correctly unlock the page and
> > release the page cache with proper error value. All write_end()
> > should unlock/release the page that was locked by write_beg().
> >
> > Signed-off-by: Taesoo Kim <tsgatesv@...il.com>
> > ---
> >  fs/affs/file.c | 19 ++++++++++++-------
> >  1 file changed, 12 insertions(+), 7 deletions(-)
> >
> > diff --git a/fs/affs/file.c b/fs/affs/file.c
> > index d2468bf..a91795e 100644
> > --- a/fs/affs/file.c
> > +++ b/fs/affs/file.c
> > @@ -699,8 +699,10 @@ static int affs_write_end_ofs(struct file *file, struct
> > address_space *mapping,
> >       boff = tmp % bsize;
> >       if (boff) {
> >               bh = affs_bread_ino(inode, bidx, 0);
> > -             if (IS_ERR(bh))
> > -                     return PTR_ERR(bh);
> > +             if (IS_ERR(bh)) {
> > +                     written = PTR_ERR(bh);
> > +                     goto err_first_bh;
> > +             }
> >               tmp = min(bsize - boff, to - from);
> >               BUG_ON(boff + tmp > bsize || tmp > bsize);
> >               memcpy(AFFS_DATA(bh) + boff, data + from, tmp);
> > @@ -712,14 +714,16 @@ static int affs_write_end_ofs(struct file *file, struct
> > address_space *mapping,
> >               bidx++;
> >       } else if (bidx) {
> >               bh = affs_bread_ino(inode, bidx - 1, 0);
> > -             if (IS_ERR(bh))
> > -                     return PTR_ERR(bh);
> > +             if (IS_ERR(bh)) {
> > +                     written = PTR_ERR(bh);
> > +                     goto err_first_bh;
> > +             }
> >       }
> >       while (from + bsize <= to) {
> >               prev_bh = bh;
> >               bh = affs_getemptyblk_ino(inode, bidx);
> >               if (IS_ERR(bh))
> > -                     goto out;
> > +                     goto err_bh;
> >               memcpy(AFFS_DATA(bh), data + from, bsize);
> >               if (buffer_new(bh)) {
> >                       AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
> > @@ -751,7 +755,7 @@ static int affs_write_end_ofs(struct file *file, struct
> > address_space *mapping,
> >               prev_bh = bh;
> >               bh = affs_bread_ino(inode, bidx, 1);
> >               if (IS_ERR(bh))
> > -                     goto out;
> > +                     goto err_bh;
> >               tmp = min(bsize, to - from);
> >               BUG_ON(tmp > bsize);
> >               memcpy(AFFS_DATA(bh), data + from, tmp);
> > @@ -790,12 +794,13 @@ done:
> >       if (tmp > inode->i_size)
> >               inode->i_size = AFFS_I(inode)->mmu_private = tmp;
> > 
> > +err_first_bh:
> >       unlock_page(page);
> >       page_cache_release(page);
> > 
> >       return written;
> > 
> > -out:
> > +err_bh:
> >       bh = prev_bh;
> >       if (!written)
> >               written = PTR_ERR(bh);
> > --
> > 2.3.3
> >
> 
> Hi Taesoo,
> 
>         Your patch is ok for me but we generally send a new message
> for an update with the version in title and explain updates
> done to it after ---. Here's an example of an AFFS V2 patch:
>  
> http://marc.info/?l=linux-kernel&m=142316316001752&w=2
> 
> Regards,
> Fabian
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