70 		 * We need to make sure there are no buffered pages in this  in lock_extent_direct()
91 			 * found is for a buffered write, we can not wait for it  in lock_extent_direct()
93 			 * deadlock with concurrent buffered writes on page  in lock_extent_direct()
101 			 * buffered writes always lock pages before attempting  in lock_extent_direct()
116 			 * call to readahead (a buffered read or a defrag call  in lock_extent_direct()
339 	 * Need to update the i_size under the extent lock so buffered  in btrfs_get_blocks_direct_write()
384 	 * Cap the size of reads to that usually seen in buffered I/O as we need  in btrfs_dio_iomap_begin()
407 	 * here, mmap'ed writes may have happened or buffered reads started  in btrfs_dio_iomap_begin()
449 	 * this range and we need to fallback to buffered IO, or we are doing a  in btrfs_dio_iomap_begin()
463 	 * Ok for INLINE and COMPRESSED extents we need to fallback on buffered  in btrfs_dio_iomap_begin()
465 	 * it's still buffered so for safety lets just fall back to the generic  in btrfs_dio_iomap_begin()
466 	 * buffered path.  in btrfs_dio_iomap_begin()
470 	 * do, so go ahead and fallback to buffered.  in btrfs_dio_iomap_begin()
473 	 * to buffered IO.  Don't blame me, this is the price we pay for using  in btrfs_dio_iomap_begin()
480 		 * fallback to buffered IO. This is not only because we can  in btrfs_dio_iomap_begin()
481 		 * block with buffered IO (no support for NOWAIT semantics at  in btrfs_dio_iomap_begin()
485 		 * buffered IO, at btrfs_file_read_iter() by calling  in btrfs_dio_iomap_begin()
856 		goto buffered;  in btrfs_direct_write()
917 		 * to buffered IO in case we haven't made any progress.  in btrfs_direct_write()
932 	 * we must fallback to buffered IO.  in btrfs_direct_write()
937 buffered:  in btrfs_direct_write()
941 	 * because even if we end up not blocking during the buffered IO attempt  in btrfs_direct_write()
1045 			 * fallback to a buffered read for the remainder of the  in btrfs_direct_read()