Re: [PATCH] ext4: Add a sanity check for next dentry when insert

[kernel test robot <lkp@intel.com>]

Hi Edward,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tytso-ext4/dev]
[also build test WARNING on linus/master v6.12-rc5 next-20241028]
[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/Edward-Adam-Davis/ext4-Add-a-sanity-check-for-next-dentry-when-insert/20241027-191200
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
patch link:    https://lore.kernel.org/r/tencent_E4CFC65D09852ECE2EF28C83A7C3C6E41206%40qq.com
patch subject: [PATCH] ext4: Add a sanity check for next dentry when insert
config: x86_64-randconfig-121-20241028 (https://download.01.org/0day-ci/archive/20241028/202410282131.FBDMC1Gq-lkp@intel.com/config)
compiler: clang version 19.1.2 (https://github.com/llvm/llvm-project 7ba7d8e2f7b6445b60679da826210cdde29eaf8b)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241028/202410282131.FBDMC1Gq-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410282131.FBDMC1Gq-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> fs/ext4/namei.c:2087:5: sparse: sparse: symbol 'ext4_check_next_dentry' was not declared. Should it be static?
   fs/ext4/namei.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/xarray.h, ...):
   include/linux/page-flags.h:237:46: sparse: sparse: self-comparison always evaluates to false
   include/linux/page-flags.h:237:46: sparse: sparse: self-comparison always evaluates to false
   fs/ext4/namei.c: note: in included file:
   fs/ext4/ext4.h:2429:9: sparse: sparse: self-comparison always evaluates to false

vim +/ext4_check_next_dentry +2087 fs/ext4/namei.c

  2086	
> 2087	int ext4_check_next_dentry(struct inode *dir,
  2088				struct inode *inode,
  2089				struct ext4_dir_entry_2 *de,
  2090				int buf_size,
  2091				struct ext4_filename *fname)
  2092	{
  2093		int nlen, rlen;
  2094	
  2095		nlen = ext4_dir_rec_len(de->name_len, dir);
  2096		rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
  2097		if (de->inode) {
  2098			struct ext4_dir_entry_2 *nde =
  2099				(struct ext4_dir_entry_2 *)((char *)de + nlen);
  2100			nde->rec_len = ext4_rec_len_to_disk(rlen - nlen, buf_size);
  2101			de->rec_len = ext4_rec_len_to_disk(nlen, buf_size);
  2102			de = nde;
  2103			rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
  2104			return fname_len(fname) > rlen - EXT4_BASE_DIR_LEN;
  2105		}
  2106	
  2107		return 0;
  2108	}
  2109	

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