linux-kernel - Re: [PATCH v4 1/1] DM: inplace compressed DM target (fwd)

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Message-Id: <20170214175641.GA10603@ram.oc3035372033.ibm.com>
Date:   Tue, 14 Feb 2017 09:56:41 -0800
From:   Ram Pai <linuxram@...ibm.com>
To:     Julia Lawall <julia.lawall@...6.fr>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        dm-devel@...hat.com, linux-raid@...r.kernel.org, agk@...hat.com,
        snitzer@...hat.com, corbet@....net, shli@...nel.org,
        hbabu@...ibm.com
Subject: Re: [PATCH v4 1/1] DM: inplace compressed DM target (fwd)

On Tue, Feb 14, 2017 at 07:09:04AM +0100, Julia Lawall wrote:
> On line 1759, since ret is unsigned it will not be less than 0.

Thanks fixed it. Infact noticed that dm_icomp_io_range_compress() had missed a case where
it was supposed to return error; a negative number.  Fixed that aswell.

RP

> 
> julia
> 
> ---------- Forwarded message ----------
> Date: Tue, 14 Feb 2017 09:00:39 +0800
> From: kbuild test robot <fengguang.wu@...el.com>
> To: kbuild@...org
> Cc: Julia Lawall <julia.lawall@...6.fr>
> Subject: Re: [PATCH v4 1/1] DM: inplace compressed DM target
> 
> CC: kbuild-all@...org
> In-Reply-To: <1487018545-5061-2-git-send-email-linuxram@...ibm.com>
> 
> Hi Ram,
> 
> [auto build test WARNING on dm/for-next]
> [also build test WARNING on v4.10-rc8 next-20170213]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
> 
> url:    https://github.com/0day-ci/linux/commits/Ram-Pai/DM-inplace-compressed-DM-target/20170214-055727
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git for-next
> :::::: branch date: 3 hours ago
> :::::: commit date: 3 hours ago
> 
> >> drivers/md/dm-inplace-compress.c:1759:5-8: WARNING: Unsigned expression compared with zero: ret < 0
> 
> git remote add linux-review https://github.com/0day-ci/linux
> git remote update linux-review
> git checkout e7924efaaba5efdcd28f32efbb949ed1153c932c
> vim +1759 drivers/md/dm-inplace-compress.c
> 
> e7924efa Ram Pai 2017-02-13  1743   * @io : io range
> e7924efa Ram Pai 2017-02-13  1744   * @sector_start : the sector on backing storage to which the
> e7924efa Ram Pai 2017-02-13  1745   *	compressed data needs to be written.
> e7924efa Ram Pai 2017-02-13  1746   * @meta_start: the page index of the bits corresponding to
> e7924efa Ram Pai 2017-02-13  1747   * @meta_end  : start and end blocks.
> e7924efa Ram Pai 2017-02-13  1748   */
> e7924efa Ram Pai 2017-02-13  1749  static int dm_icomp_compress_write(struct dm_icomp_io_range *io,
> e7924efa Ram Pai 2017-02-13  1750  		sector_t sector_start, u64 *meta_start, u64 *meta_end)
> e7924efa Ram Pai 2017-02-13  1751  {
> e7924efa Ram Pai 2017-02-13  1752  	struct dm_icomp_req *req = io->req;
> e7924efa Ram Pai 2017-02-13  1753  	sector_t count = DMCP_BYTES_TO_SECTOR(io->decomp_len);
> e7924efa Ram Pai 2017-02-13  1754  	unsigned int comp_len, ret;
> e7924efa Ram Pai 2017-02-13  1755  	u64 page_index;
> e7924efa Ram Pai 2017-02-13  1756
> e7924efa Ram Pai 2017-02-13  1757  	/* comp_data must be able to accommadate a larger compress buffer */
> e7924efa Ram Pai 2017-02-13  1758  	ret = dm_icomp_io_range_compress(req->info, io, &comp_len);
> e7924efa Ram Pai 2017-02-13 @1759  	if (ret < 0) {
> e7924efa Ram Pai 2017-02-13  1760  		req->result = -EIO;
> e7924efa Ram Pai 2017-02-13  1761  		return -EIO;
> e7924efa Ram Pai 2017-02-13  1762  	}
> e7924efa Ram Pai 2017-02-13  1763  	WARN_ON(comp_len > io->comp_len);
> e7924efa Ram Pai 2017-02-13  1764
> e7924efa Ram Pai 2017-02-13  1765  	dm_icomp_get_req(req);
> e7924efa Ram Pai 2017-02-13  1766
> e7924efa Ram Pai 2017-02-13  1767  	io->io_req.bi_op = REQ_OP_WRITE;
> 
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

-- 
Ram Pai