33 void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg)  in scatterwalk_start()  argument
35 	walk->sg = sg;  in scatterwalk_start()
39 	walk->offset = sg->offset;  in scatterwalk_start()
43 void *scatterwalk_map(struct scatter_walk *walk)  in scatterwalk_map()  argument
45 	return kmap_atomic(scatterwalk_page(walk)) +  in scatterwalk_map()
46 	       offset_in_page(walk->offset);  in scatterwalk_map()
50 static void scatterwalk_pagedone(struct scatter_walk *walk, int out,  in scatterwalk_pagedone()  argument
56 		page = sg_page(walk->sg) + ((walk->offset - 1) >> PAGE_SHIFT);  in scatterwalk_pagedone()
62 		walk->offset += PAGE_SIZE - 1;  in scatterwalk_pagedone()
63 		walk->offset &= PAGE_MASK;  in scatterwalk_pagedone()
64 		if (walk->offset >= walk->sg->offset + walk->sg->length)  in scatterwalk_pagedone()
65 			scatterwalk_start(walk, sg_next(walk->sg));  in scatterwalk_pagedone()
69 void scatterwalk_done(struct scatter_walk *walk, int out, int more)  in scatterwalk_done()  argument
71 	if (!(scatterwalk_pagelen(walk) & (PAGE_SIZE - 1)) || !more)  in scatterwalk_done()
72 		scatterwalk_pagedone(walk, out, more);  in scatterwalk_done()
76 void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,  in scatterwalk_copychunks()  argument
80 		unsigned int len_this_page = scatterwalk_pagelen(walk);  in scatterwalk_copychunks()
86 		vaddr = scatterwalk_map(walk);  in scatterwalk_copychunks()
90 		scatterwalk_advance(walk, len_this_page);  in scatterwalk_copychunks()
98 		scatterwalk_pagedone(walk, out, 1);  in scatterwalk_copychunks()
106 	struct scatter_walk walk;  in scatterwalk_map_and_copy()  local
113 		scatterwalk_start(&walk, sg);  in scatterwalk_map_and_copy()
122 	scatterwalk_advance(&walk, start - offset);  in scatterwalk_map_and_copy()
123 	scatterwalk_copychunks(buf, &walk, nbytes, out);  in scatterwalk_map_and_copy()
124 	scatterwalk_done(&walk, out, 0);  in scatterwalk_map_and_copy()