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

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Date:	Sat, 21 Mar 2015 20:51:55 +0100 (CET)
From:	Fabian Frederick <fabf@...net.be>
To:	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
Cc:	taesoo@...ech.edu, 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



> 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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