linux-kernel - Re: [PATCH v2] procfs: fix numbering in /proc/locks

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Date:	Fri, 1 Oct 2010 15:03:08 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Jerome Marchand <jmarchan@...hat.com>
Cc:	Matthew Wilcox <matthew@....cx>,
	Pavel Emelyanov <xemul@...allels.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] procfs: fix numbering in /proc/locks

On Thu, Sep 30, 2010 at 02:38:18PM +0200, Jerome Marchand wrote:
>
>The lock number in /proc/locks (first field) is implemented by a counter
>(private field of struct seq_file) which is incremented at each call of
>locks_show() and reset to 1 in locks_start() whatever the offset is. It
>should be reset according to the actual position in the list.
>
>Moreover, locks_show() can be called twice to print a single line thus
>skipping a number. The counter should be incremented in locks_next().
>
>Signed-off-by: Jerome Marchand <jmarchan@...hat.com>

This patch looks good to me,

Reviewed-by: WANG Cong <xiyou.wangcong@...il.com>

Need to Cc -stable?

>---
> locks.c |    4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
>diff --git a/fs/locks.c b/fs/locks.c
>index ab24d49..49d7343 100644
>--- a/fs/locks.c
>+++ b/fs/locks.c
>@@ -2166,19 +2166,19 @@ static int locks_show(struct seq_file *f, void *v)
> 	list_for_each_entry(bfl, &fl->fl_block, fl_block)
> 		lock_get_status(f, bfl, (long)f->private, " ->");
> 
>-	f->private++;
> 	return 0;
> }
> 
> static void *locks_start(struct seq_file *f, loff_t *pos)
> {
> 	lock_kernel();
>-	f->private = (void *)1;
>+	f->private = (void *) (*pos + 1);
> 	return seq_list_start(&file_lock_list, *pos);
> }
> 
> static void *locks_next(struct seq_file *f, void *v, loff_t *pos)
> {
>+	f->private++;
> 	return seq_list_next(v, &file_lock_list, pos);
> }
> 
>--
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