Re: [PATCH v4 4/5] blktrace: break out of blktrace setup on concurrent calls

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 2020-05-08 20:10, Luis Chamberlain wrote:
> @@ -493,6 +496,12 @@ static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
>  	 */
>  	strreplace(buts->name, '/', '_');
>  
> +	if (q->blk_trace) {
> +		pr_warn("Concurrent blktraces are not allowed on %s\n",
> +			buts->name);
> +		return -EBUSY;
> +	}
> +
>  	bt = kzalloc(sizeof(*bt), GFP_KERNEL);
>  	if (!bt)
>  		return -ENOMEM;

Is this really sufficient? Shouldn't concurrent do_blk_trace_setup()
calls that refer to the same request queue be serialized to really
prevent that debugfs attribute creation fails?

How about using the block device name instead of the partition name in
the error message since the concurrency context is the block device and
not the partition?

Thanks,

Bart.






[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux OMAP]     [Linux MIPS]     [eCos]     [Asterisk Internet PBX]     [Linux API]

  Powered by Linux