40 	 * The extent size threshold for autodefrag.
589  * Defrag specific helper to get an extent map.
602  * Return valid em if we find a file extent matching the requirement.
603  * Return NULL if we can not find a file extent matching the requirement.
663 	/* Iterate through the path to find a file extent covering @start */  in defrag_get_extent()
680 		/* It's beyond our target range, definitely not extent found */  in defrag_get_extent()
685 		 *	|	|<- File extent ->|  in defrag_get_extent()
705 		 *	|<- file extent ->|	|  in defrag_get_extent()
713 		/* Now this extent covers @start, convert it to em */  in defrag_get_extent()
743 	 * Hopefully we have this extent in the tree already, try without the  in defrag_lookup_extent()
744 	 * full extent lock.  in defrag_lookup_extent()
751 	 * We can get a merged extent, in that case, we need to re-search  in defrag_lookup_extent()
756 	 * so that we use less metadata (extent items in the extent tree and  in defrag_lookup_extent()
757 	 * file extent items in the inode's subvolume tree).  in defrag_lookup_extent()
798 	/* This is the last extent */  in defrag_check_next_extent()
803 	 * Here we need to pass @newer_then when checking the next extent, or  in defrag_check_next_extent()
804 	 * we will hit a case we mark current extent for defrag, but the next  in defrag_check_next_extent()
815 	 * If the next extent is at its max capacity, defragging current extent  in defrag_check_next_extent()
820 	/* Skip older extent */  in defrag_check_next_extent()
823 	/* Also check extent size */  in defrag_check_next_extent()
839  * - No ordered extent exists in the page.
888 	/* Wait for any existing ordered extent in the range */  in defrag_prepare_one_folio()
914 	 * Now the page range has no ordered extent any more.  Read the page to  in defrag_prepare_one_folio()
945  * @extent_thresh: file extent size threshold, any extent size >= this value
951  * @locked:	   if the range has already held extent lock
977 		 * If the file extent is an inlined one, we may still want to  in defrag_collect_targets()
978 		 * defrag it (fallthrough) if it will cause a regular extent.  in defrag_collect_targets()
991 		/* Skip older extent */  in defrag_collect_targets()
1000 		 * Our start offset might be in the middle of an existing extent  in defrag_collect_targets()
1005 		 * If this range of the extent map is already flagged for delalloc,  in defrag_collect_targets()
1014 		 *    extent, requires locking the range;  in defrag_collect_targets()
1019 		 *    extent). If we mark pages in an adjacent range for defrag,  in defrag_collect_targets()
1021 		 *    very likely resulting in a larger extent after writeback is  in defrag_collect_targets()
1035 		/* Skip too large extent */  in defrag_collect_targets()
1049 		 * So if an inline extent passed all above checks, just add it  in defrag_collect_targets()
1119 		 * If the last extent is not a target, the caller can skip to  in defrag_collect_targets()
1120 		 * the end of that extent.  in defrag_collect_targets()
1145  *   Pages should be locked, no ordered extent in the pages range,
1148  * - Extent bits are locked
1234 	 * Now we have a consistent view about the extent map, re-check  in defrag_one_range()
1237 	 * And this time we have extent locked already, pass @locked = true  in defrag_one_range()
1238 	 * so that we won't relock the extent range and cause deadlock.  in defrag_one_range()