fs/btrfs/defrag.c

241 	struct btrfs_ioctl_defrag_range_args range;
272 	memset(&range, 0, sizeof(range));
273 	range.len = (u64)-1;
274 	range.start = cur;
275 	range.extent_thresh = defrag->extent_thresh;
278 	ret = btrfs_defrag_file(inode, NULL, &range, defrag->transid,
286 	cur = max(cur + fs_info->sectorsize, range.start);
698 		/* It's beyond our target range, definitely not extent found */
900 	/* Wait for any existing ordered extent in the range */
927 	 * Now the page range has no ordered extent any more.  Read the page to
964  * @locked:	   if the range has already held extent lock
1018 		 * If this range of the extent map is already flagged for delalloc,
1025 		 *    because we do the space reservation while holding the range
1027 		 *    extent, requires locking the range;
1032 		 *    extent). If we mark pages in an adjacent range for defrag,
1033 		 *    then we will have a larger contiguous range for delalloc,
1090 		 * last range of the target list.
1134 		 * Otherwise, we can only go the end of the specified range.
1148  * Defrag one contiguous target range.
1151  * @target:	target range to defrag
1152  * @pages:	locked pages covering the defrag range
1158  *   Pages should be locked, no ordered extent in the pages range,
1235 	/* Lock the pages range */
1241 	 * which range really needs to be defragged.
1244 	 * so that we won't relock the extent range and cause deadlock.
1311 		 * our range may already be invalid (e.g. hole punched).
1312 		 * Skip if our range is before last_scanned_ret, as there is
1313 		 * no need to defrag the range anymore.
1324 		 * Here we may not defrag any range if holes are punched before
1352  * @range:	   defrag options including range and flags
1358  * Return >=0 for the number of sectors defragged, and range->start will be updated
1361  *  defragging all the range).
1364 		      struct btrfs_ioctl_defrag_range_args *range,
1372 	bool do_compress = (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS);
1376 	u32 extent_thresh = range->extent_thresh;
1382 	if (range->start >= isize)
1386 		if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES)
1388 		if (range->compress_type)
1389 			compress_type = range->compress_type;
1395 	if (range->start + range->len > range->start) {
1396 		/* Got a specific range */
1397 		last_byte = min(isize, range->start + range->len);
1403 	/* Align the range */
1404 	cur = round_down(range->start, fs_info->sectorsize);
1420 	 * Make writeback start from the beginning of the range, so that the
1421 	 * defrag range can be written sequentially.
1476 	 * Update range.start for autodefrag, this will indicate where to start
1479 	range->start = cur;
1485 		if (range->flags & BTRFS_DEFRAG_RANGE_START_IO) {
1491 		if (range->compress_type == BTRFS_COMPRESS_LZO)
1493 		else if (range->compress_type == BTRFS_COMPRESS_ZSTD)