Re: [PATCH 1/1] Add FALLOC_FL_ALLOCATE_RANGE to the set of supported fallocate mode flags. This change improves code clarity and maintains by explicitly showing this flag in the supported flags mask.

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

Hi chuguangqing,

kernel test robot noticed the following build errors:

[auto build test ERROR on next-20250714]
[cannot apply to tytso-ext4/dev v6.16-rc6 v6.16-rc5 v6.16-rc4 linus/master v6.16-rc6]
[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/chuguangqing/Add-FALLOC_FL_ALLOCATE_RANGE-to-the-set-of-supported-fallocate-mode-flags-This-change-improves-code-clarity-and-maintain/20250715-111753
base:   next-20250714
patch link:    https://lore.kernel.org/r/20250715031531.1693-2-chuguangqing%40inspur.com
patch subject: [PATCH 1/1] Add FALLOC_FL_ALLOCATE_RANGE to the set of supported fallocate mode flags. This change improves code clarity and maintains by explicitly showing this flag in the supported flags mask.
config: arc-randconfig-002-20250715 (https://download.01.org/0day-ci/archive/20250715/202507152101.0vyIZZfK-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 11.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250715/202507152101.0vyIZZfK-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/202507152101.0vyIZZfK-lkp@intel.com/

All errors (new ones prefixed by >>):

   fs/ext4/extents.c: In function 'ext4_fallocate':
>> fs/ext4/extents.c:4787:22: error: 'FALL_C_FL_ALLOCATE_RANGE' undeclared (first use in this function); did you mean 'FALLOC_FL_ALLOCATE_RANGE'?
    4787 |         if (mode & ~(FALL_C_FL_ALLOCATE_RANGE | FALLOC_FL_KEEP_SIZE |
         |                      ^~~~~~~~~~~~~~~~~~~~~~~~
         |                      FALLOC_FL_ALLOCATE_RANGE
   fs/ext4/extents.c:4787:22: note: each undeclared identifier is reported only once for each function it appears in


vim +4787 fs/ext4/extents.c

  4755	
  4756	/*
  4757	 * preallocate space for a file. This implements ext4's fallocate file
  4758	 * operation, which gets called from sys_fallocate system call.
  4759	 * For block-mapped files, posix_fallocate should fall back to the method
  4760	 * of writing zeroes to the required new blocks (the same behavior which is
  4761	 * expected for file systems which do not support fallocate() system call).
  4762	 */
  4763	long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
  4764	{
  4765		struct inode *inode = file_inode(file);
  4766		struct address_space *mapping = file->f_mapping;
  4767		int ret;
  4768	
  4769		/*
  4770		 * Encrypted inodes can't handle collapse range or insert
  4771		 * range since we would need to re-encrypt blocks with a
  4772		 * different IV or XTS tweak (which are based on the logical
  4773		 * block number).
  4774		 */
  4775		if (IS_ENCRYPTED(inode) &&
  4776		    (mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)))
  4777			return -EOPNOTSUPP;
  4778		/*
  4779		 * Don't allow writing zeroes if the underlying device does not
  4780		 * enable the unmap write zeroes operation.
  4781		 */
  4782		if ((mode & FALLOC_FL_WRITE_ZEROES) &&
  4783		    !bdev_write_zeroes_unmap_sectors(inode->i_sb->s_bdev))
  4784			return -EOPNOTSUPP;
  4785	
  4786		/* Return error if mode is not supported */
> 4787		if (mode & ~(FALL_C_FL_ALLOCATE_RANGE | FALLOC_FL_KEEP_SIZE |
  4788			     FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE |
  4789			     FALLOC_FL_ZERO_RANGE | FALLOC_FL_INSERT_RANGE))
  4790			return -EOPNOTSUPP;
  4791	
  4792		inode_lock(inode);
  4793		ret = ext4_convert_inline_data(inode);
  4794		if (ret)
  4795			goto out_inode_lock;
  4796	
  4797		/* Wait all existing dio workers, newcomers will block on i_rwsem */
  4798		inode_dio_wait(inode);
  4799	
  4800		ret = file_modified(file);
  4801		if (ret)
  4802			goto out_inode_lock;
  4803	
  4804		if ((mode & FALLOC_FL_MODE_MASK) == FALLOC_FL_ALLOCATE_RANGE) {
  4805			ret = ext4_do_fallocate(file, offset, len, mode);
  4806			goto out_inode_lock;
  4807		}
  4808	
  4809		/*
  4810		 * Follow-up operations will drop page cache, hold invalidate lock
  4811		 * to prevent page faults from reinstantiating pages we have
  4812		 * released from page cache.
  4813		 */
  4814		filemap_invalidate_lock(mapping);
  4815	
  4816		ret = ext4_break_layouts(inode);
  4817		if (ret)
  4818			goto out_invalidate_lock;
  4819	
  4820		switch (mode & FALLOC_FL_MODE_MASK) {
  4821		case FALLOC_FL_PUNCH_HOLE:
  4822			ret = ext4_punch_hole(file, offset, len);
  4823			break;
  4824		case FALLOC_FL_COLLAPSE_RANGE:
  4825			ret = ext4_collapse_range(file, offset, len);
  4826			break;
  4827		case FALLOC_FL_INSERT_RANGE:
  4828			ret = ext4_insert_range(file, offset, len);
  4829			break;
  4830		case FALLOC_FL_ZERO_RANGE:
  4831		case FALLOC_FL_WRITE_ZEROES:
  4832			ret = ext4_zero_range(file, offset, len, mode);
  4833			break;
  4834		default:
  4835			ret = -EOPNOTSUPP;
  4836		}
  4837	
  4838	out_invalidate_lock:
  4839		filemap_invalidate_unlock(mapping);
  4840	out_inode_lock:
  4841		inode_unlock(inode);
  4842		return ret;
  4843	}
  4844	

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