linux-kernel - Re: [RFC 15/22] tcm: Add FILEIO subsystem plugin

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Message-ID: <AANLkTimPh+SNroYoavomwVtQ5UHsr7Lsq_229Vkbc1CB@mail.gmail.com>
Date:	Mon, 20 Sep 2010 18:18:21 +0200
From:	Fubo Chen <fubo.chen@...il.com>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Mike Christie <michaelc@...wisc.edu>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	James Bottomley <James.Bottomley@...e.de>,
	Jens Axboe <axboe@...nel.dk>,
	Boaz Harrosh <bharrosh@...asas.com>
Subject: Re: [RFC 15/22] tcm: Add FILEIO subsystem plugin

On Mon, Aug 30, 2010 at 11:22 AM, Nicholas A. Bellinger
<nab@...ux-iscsi.org> wrote:
> From: Nicholas Bellinger <nab@...ux-iscsi.org>
>
> This patch adds the O_SYNC FILEIO subsystem plugin for accessing struct file
> using Linux/VFS struct file_operations.  It also includes WriteCache and FUA
> Write Emulation support to struct file using fs/sync.c/vfs_fsync_range()
>
> Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
>
> [ ... ]
>
> +static int fd_do_writev(struct fd_request *req, struct se_task *task)
> +{
> +       struct file *fd = req->fd_dev->fd_file;
> +       struct scatterlist *sg = task->task_sg;
> +       struct iovec iov[req->fd_sg_count];

Kernel stack size is 8 KB. On a 64-bit system struct iovec takes 16
bytes. What happens if req->fd_sg_count is large ? Kernel crash ?

Fubo.
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