linux-kernel - Re: [PATCH 1/2] fs: use mapping_set_error instead of opencoded set

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Message-Id: <20160912151823.45d01e5acc44fa082c94dd2c@linux-foundation.org>
Date:   Mon, 12 Sep 2016 15:18:23 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Michal Hocko <mhocko@...nel.org>, <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 1/2] fs: use mapping_set_error instead of opencoded
 set_bit

On Mon, 12 Sep 2016 15:11:46 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote:

> > @@ -409,7 +408,7 @@ static int afs_write_back_from_locked_page(struct afs_writeback *wb,
> >  		case -ENOMEDIUM:
> >  		case -ENXIO:
> >  			afs_kill_pages(wb->vnode, true, first, last);
> > -			set_bit(AS_EIO, &wb->vnode->vfs_inode.i_mapping->flags);
> > +			mapping_set_error(wb->vnode->vfs_inode.i_mapping, -ENXIO);
> 
> This one is a functional change: mapping_set_error() will rewrite
> -ENXIO into -EIO.  Doesn't seem at all important though.

hm, OK, it's not a functional change - the code was already doing
s/ENXIO/EIO/.

Let's make it look more truthful?

--- a/fs/afs/write.c~fs-use-mapping_set_error-instead-of-opencoded-set_bit-fix
+++ a/fs/afs/write.c
@@ -408,7 +408,7 @@ no_more:
 		case -ENOMEDIUM:
 		case -ENXIO:
 			afs_kill_pages(wb->vnode, true, first, last);
-			mapping_set_error(wb->vnode->vfs_inode.i_mapping, -ENXIO);
+			mapping_set_error(wb->vnode->vfs_inode.i_mapping, -EIO);
 			break;
 		case -EACCES:
 		case -EPERM:
_