linux-kernel - Re: [PATCH v3] Add 4 tracepoint events for vfs

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Date:	Thu, 31 Jan 2013 07:50:10 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	chenggang.qin@...il.com
Cc:	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	David Ahern <dsahern@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Namhyung Kim <namhyung@...il.com>,
	Yanmin Zhang <yanmin.zhang@...el.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Mike Galbraith <efault@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chenggang Qin <chenggang.qcg@...baba-inc.com>
Subject: Re: [PATCH v3] Add 4 tracepoint events for vfs

On Thu, Jan 31, 2013 at 03:40:38PM +0800, chenggang.qin@...il.com wrote:
> @@ -1391,12 +1394,16 @@ generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
>  	unsigned long seg = 0;
>  	size_t count;
>  	loff_t *ppos = &iocb->ki_pos;
> +	const unsigned char *f_name;
>  
>  	count = 0;
>  	retval = generic_segment_checks(iov, &nr_segs, &count, VERIFY_WRITE);
>  	if (retval)
>  		return retval;
>  
> +	f_name = filp->f_path.dentry->d_name.name;
> +	trace_generic_file_aio_read(pos, iov_length(iov, nr_segs), f_name);

And just what is going to prevent that f_name of yours from being freed
just as you are passing it to the function you are calling?

IOW, NAK.  BTW, I would like to point out that *ANY* hooks in VFS have all
the stability granted to driver API - removal fodder whenever it becomes
convenient.
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