Re: [PATCH v3 6/8] ext4: make ext4_es_insert_delayed_block return void

kernel test robot
2023-04-12T14:20:18Z

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@intel.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;
| ^~~~~~~~

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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