[PATCH] erofs: clean up the cache if cached decompression is disabled

[kernel test robot]

Hi Chunhai,

kernel test robot noticed the following build errors:

[auto build test ERROR on xiang-erofs/dev-test]
[also build test ERROR on xiang-erofs/dev xiang-erofs/fixes linus/master v6.12-rc7 next-20241112]
[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/Chunhai-Guo/erofs-clean-up-the-cache-if-cached-decompression-is-disabled/20241112-105927
base:   https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git dev-test
patch link:    https://lore.kernel.org/r/20241112031513.528474-1-guochunhai%40vivo.com
patch subject: [PATCH] erofs: clean up the cache if cached decompression is disabled
config: x86_64-randconfig-161-20241112 (https://download.01.org/0day-ci/archive/20241112/202411121801.vd2yHEHx-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241112/202411121801.vd2yHEHx-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411121801.vd2yHEHx-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/seq_file.h:9,
                    from fs/erofs/super.c:8:
   fs/erofs/super.c: In function 'erofs_fc_reconfigure':
>> fs/erofs/super.c:749:32: error: 'struct erofs_sb_info' has no member named 'umount_mutex'
     749 |                 mutex_lock(&sbi->umount_mutex);
         |                                ^~
   include/linux/mutex.h:166:44: note: in definition of macro 'mutex_lock'
     166 | #define mutex_lock(lock) mutex_lock_nested(lock, 0)
         |                                            ^~~~
>> fs/erofs/super.c:750:17: error: implicit declaration of function 'z_erofs_shrink_scan' [-Werror=implicit-function-declaration]
     750 |                 z_erofs_shrink_scan(sbi, ~0UL);
         |                 ^~~~~~~~~~~~~~~~~~~
   fs/erofs/super.c:751:34: error: 'struct erofs_sb_info' has no member named 'umount_mutex'
     751 |                 mutex_unlock(&sbi->umount_mutex);
         |                                  ^~
   cc1: some warnings being treated as errors


vim +749 fs/erofs/super.c

   731	
   732	static int erofs_fc_reconfigure(struct fs_context *fc)
   733	{
   734		struct super_block *sb = fc->root->d_sb;
   735		struct erofs_sb_info *sbi = EROFS_SB(sb);
   736		struct erofs_sb_info *new_sbi = fc->s_fs_info;
   737	
   738		DBG_BUGON(!sb_rdonly(sb));
   739	
   740		if (new_sbi->fsid || new_sbi->domain_id)
   741			erofs_info(sb, "ignoring reconfiguration for fsid|domain_id.");
   742	
   743		if (test_opt(&new_sbi->opt, POSIX_ACL))
   744			fc->sb_flags |= SB_POSIXACL;
   745		else
   746			fc->sb_flags &= ~SB_POSIXACL;
   747	
   748		if (new_sbi->opt.cache_strategy == EROFS_ZIP_CACHE_DISABLED) {
 > 749			mutex_lock(&sbi->umount_mutex);
 > 750			z_erofs_shrink_scan(sbi, ~0UL);
   751			mutex_unlock(&sbi->umount_mutex);
   752		}
   753		sbi->opt = new_sbi->opt;
   754	
   755		fc->sb_flags |= SB_RDONLY;
   756		return 0;
   757	}
   758	

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