260  * Return 0 for the range [disk_bytenr, disk_bytenr + sectorsize) has no csum
281 	/* Check if the current csum item covers disk_bytenr */  in search_csum_tree()
364  * Lookup the checksum for the read bio in csum tree.
371  *       btrfs_bio(bio)->csum instead.
386 	u8 *csum;  in btrfs_lookup_bio_sums()  local
399 	 * - All our csums should only be in csum tree  in btrfs_lookup_bio_sums()
416 			bbio->csum = kmalloc_array(nblocks, csum_size, GFP_NOFS);  in btrfs_lookup_bio_sums()
417 			if (!bbio->csum) {  in btrfs_lookup_bio_sums()
422 			bbio->csum = bbio->csum_inline;  in btrfs_lookup_bio_sums()
424 		csum = bbio->csum;  in btrfs_lookup_bio_sums()
426 		csum = dst;  in btrfs_lookup_bio_sums()
431 	 * kick the readahead for csum tree.  in btrfs_lookup_bio_sums()
440 	 * between reading the free space cache and updating the csum tree.  in btrfs_lookup_bio_sums()
465 		csum_dst = csum + sector_offset * csum_size;  in btrfs_lookup_bio_sums()
477 		 * We didn't find a csum for this range.  We need to make sure  in btrfs_lookup_bio_sums()
483 		 * copying is in fact NODATASUM.  If we don't find a csum we  in btrfs_lookup_bio_sums()
503 			"csum hole found for disk bytenr range [%llu, %llu)",  in btrfs_lookup_bio_sums()
749  * helper function for csum removal, this expects the
750  * key to describe the csum pointed to by the path, and it expects
751  * the csum to overlap the range [bytenr, len]
753  * The csum should not be entirely contained in the range and the
754  * range should not be entirely contained in the csum.
779 		 *   [csum     ]  in truncate_one_csum()
790 		 *                 [csum     ]  in truncate_one_csum()
791 		 * we need to truncate from the beginning of the csum  in truncate_one_csum()
806  * deletes the csum items from the csum tree for a given
859 		/* this csum ends before we start, we're done */  in btrfs_del_csums()
868 			 * Check how many csum items preceding this one in this  in btrfs_del_csums()
902 			 *     [csum                ]  in btrfs_del_csums()
904 			 * Our bytes are in the middle of the csum,  in btrfs_del_csums()
908 			 * csum could change, get removed, extended etc.  in btrfs_del_csums()
910 			 * The trick here is the max size of a csum item leaves  in btrfs_del_csums()
915 			 * a nicely formed csum item that we can neatly  in btrfs_del_csums()
1041 		/* We didn't find a csum item, insert one. */  in btrfs_csum_file_blocks()
1153 		goto csum;  in btrfs_csum_file_blocks()
1180 csum:  in btrfs_csum_file_blocks()