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Date: Thu, 13 Apr 2023 10:36:40 +0800
From: Baokun Li <libaokun1@...wei.com>
To: kernel test robot <lkp@...el.com>, <linux-ext4@...r.kernel.org>
CC: <oe-kbuild-all@...ts.linux.dev>, <tytso@....edu>,
<adilger.kernel@...ger.ca>, <jack@...e.cz>,
<ritesh.list@...il.com>, <linux-kernel@...r.kernel.org>,
<yi.zhang@...wei.com>, <yangerkun@...wei.com>,
<yukuai3@...wei.com>, Baokun Li <libaokun1@...wei.com>
Subject: Re: [PATCH v3 6/8] ext4: make ext4_es_insert_delayed_block return
void
On 2023/4/12 22:19, kernel test robot wrote:
> Hi Baokun,
>
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on tytso-ext4/dev]
> [also build test WARNING on linus/master v6.3-rc6 next-20230412]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url: https://github.com/intel-lab-lkp/linux/commits/Baokun-Li/ext4-only-update-i_reserved_data_blocks-on-successful-block-allocation/20230412-204407
> base: https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
> patch link: https://lore.kernel.org/r/20230412124126.2286716-7-libaokun1%40huawei.com
> patch subject: [PATCH v3 6/8] ext4: make ext4_es_insert_delayed_block return void
> config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20230412/202304122234.3Meeshf9-lkp@intel.com/config)
> compiler: m68k-linux-gcc (GCC) 12.1.0
> reproduce (this is a W=1 build):
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # https://github.com/intel-lab-lkp/linux/commit/87f992eeab9cd894894e27c3c6ff322cbd473ebf
> git remote add linux-review https://github.com/intel-lab-lkp/linux
> git fetch --no-tags linux-review Baokun-Li/ext4-only-update-i_reserved_data_blocks-on-successful-block-allocation/20230412-204407
> git checkout 87f992eeab9cd894894e27c3c6ff322cbd473ebf
> # save the config file
> mkdir build_dir && cp config build_dir/.config
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k olddefconfig
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash fs/ext4/
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>
> | Link: https://lore.kernel.org/oe-kbuild-all/202304122234.3Meeshf9-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
> fs/ext4/inode.c: In function 'ext4_insert_delayed_block':
>>> fs/ext4/inode.c:1640:14: warning: variable 'reserved' set but not used [-Wunused-but-set-variable]
> 1640 | bool reserved = false;
> | ^~~~~~~~
Thank you very much for testing, I will fix this issue in the next
version of the patch.
I checked with make W=2 to see if it would introduce a compile warning
before sending,
but it did not check for the problem. When I saw this email I checked
again with W=1,
and this checked the problem instead. This is strange, doesn't it seem
to me that a high
rank warning check should include a low rank warning check?
Am I misunderstanding or is this a bug?
>
> vim +/reserved +1640 fs/ext4/inode.c
>
> df22291ff0fde0 Aneesh Kumar K.V 2008-09-08 1623
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1624 /*
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1625 * ext4_insert_delayed_block - adds a delayed block to the extents status
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1626 * tree, incrementing the reserved cluster/block
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1627 * count or making a pending reservation
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1628 * where needed
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1629 *
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1630 * @inode - file containing the newly added block
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1631 * @lblk - logical block to be added
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1632 *
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1633 * Returns 0 on success, negative error code on failure.
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1634 */
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1635 static int ext4_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk)
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1636 {
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1637 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
> 87f992eeab9cd8 Baokun Li 2023-04-12 1638 int ret = 0;
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1639 bool allocated = false;
> 6fed83957f21ef Jeffle Xu 2021-08-23 @1640 bool reserved = false;
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1641
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1642 /*
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1643 * If the cluster containing lblk is shared with a delayed,
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1644 * written, or unwritten extent in a bigalloc file system, it's
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1645 * already been accounted for and does not need to be reserved.
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1646 * A pending reservation must be made for the cluster if it's
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1647 * shared with a written or unwritten extent and doesn't already
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1648 * have one. Written and unwritten extents can be purged from the
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1649 * extents status tree if the system is under memory pressure, so
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1650 * it's necessary to examine the extent tree if a search of the
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1651 * extents status tree doesn't get a match.
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1652 */
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1653 if (sbi->s_cluster_ratio == 1) {
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1654 ret = ext4_da_reserve_space(inode);
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1655 if (ret != 0) /* ENOSPC */
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1656 goto errout;
> 6fed83957f21ef Jeffle Xu 2021-08-23 1657 reserved = true;
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1658 } else { /* bigalloc */
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1659 if (!ext4_es_scan_clu(inode, &ext4_es_is_delonly, lblk)) {
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1660 if (!ext4_es_scan_clu(inode,
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1661 &ext4_es_is_mapped, lblk)) {
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1662 ret = ext4_clu_mapped(inode,
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1663 EXT4_B2C(sbi, lblk));
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1664 if (ret < 0)
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1665 goto errout;
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1666 if (ret == 0) {
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1667 ret = ext4_da_reserve_space(inode);
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1668 if (ret != 0) /* ENOSPC */
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1669 goto errout;
> 6fed83957f21ef Jeffle Xu 2021-08-23 1670 reserved = true;
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1671 } else {
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1672 allocated = true;
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1673 }
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1674 } else {
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1675 allocated = true;
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1676 }
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1677 }
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1678 }
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1679
> 87f992eeab9cd8 Baokun Li 2023-04-12 1680 ext4_es_insert_delayed_block(inode, lblk, allocated);
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1681 errout:
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1682 return ret;
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1683 }
> 0b02f4c0d6d9e2 Eric Whitney 2018-10-01 1684
>
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