251  *       btrfs_io_bio(bio)->csum instead.
265 	u8 *csum;  in btrfs_lookup_bio_sums()  local
284 			btrfs_bio->csum = kmalloc_array(nblocks, csum_size,  in btrfs_lookup_bio_sums()
286 			if (!btrfs_bio->csum) {  in btrfs_lookup_bio_sums()
291 			btrfs_bio->csum = btrfs_bio->csum_inline;  in btrfs_lookup_bio_sums()
293 		csum = btrfs_bio->csum;  in btrfs_lookup_bio_sums()
295 		csum = dst;  in btrfs_lookup_bio_sums()
305 	 * between reading the free space cache and updating the csum tree.  in btrfs_lookup_bio_sums()
322 					       disk_bytenr, csum, nblocks);  in btrfs_lookup_bio_sums()
337 				memset(csum, 0, csum_size);  in btrfs_lookup_bio_sums()
345 						   "no csum found for inode %llu start %llu",  in btrfs_lookup_bio_sums()
373 		read_extent_buffer(path->nodes[0], csum,  in btrfs_lookup_bio_sums()
377 		csum += count * csum_size;  in btrfs_lookup_bio_sums()
624  * helper function for csum removal, this expects the
625  * key to describe the csum pointed to by the path, and it expects
626  * the csum to overlap the range [bytenr, len]
628  * The csum should not be entirely contained in the range and the
629  * range should not be entirely contained in the csum.
654 		 *   [csum     ]  in truncate_one_csum()
665 		 *                 [csum     ]  in truncate_one_csum()
666 		 * we need to truncate from the beginning of the csum  in truncate_one_csum()
681  * deletes the csum items from the csum tree for a given
734 		/* this csum ends before we start, we're done */  in btrfs_del_csums()
743 			 * Check how many csum items preceding this one in this  in btrfs_del_csums()
777 			 *     [csum                ]  in btrfs_del_csums()
779 			 * Our bytes are in the middle of the csum,  in btrfs_del_csums()
783 			 * csum could change, get removed, extended etc.  in btrfs_del_csums()
785 			 * The trick here is the max size of a csum item leaves  in btrfs_del_csums()
790 			 * a nicely formed csum item that we can neatly  in btrfs_del_csums()
888 		/* we didn't find a csum item, insert one */  in btrfs_csum_file_blocks()
974 		goto csum;  in btrfs_csum_file_blocks()
1003 csum:  in btrfs_csum_file_blocks()