52  * Look up and return a brd's page for a given sector.
54 static struct page *brd_lookup_page(struct brd_device *brd, sector_t sector)  in brd_lookup_page()  argument
71 	idx = sector >> PAGE_SECTORS_SHIFT; /* sector to page index */  in brd_lookup_page()
81  * Look up and return a brd's page for a given sector.
85 static struct page *brd_insert_page(struct brd_device *brd, sector_t sector)  in brd_insert_page()  argument
91 	page = brd_lookup_page(brd, sector);  in brd_insert_page()
110 	idx = sector >> PAGE_SECTORS_SHIFT;  in brd_insert_page()
173 static int copy_to_brd_setup(struct brd_device *brd, sector_t sector, size_t n)  in copy_to_brd_setup()  argument
175 	unsigned int offset = (sector & (PAGE_SECTORS-1)) << SECTOR_SHIFT;  in copy_to_brd_setup()
179 	if (!brd_insert_page(brd, sector))  in copy_to_brd_setup()
182 		sector += copy >> SECTOR_SHIFT;  in copy_to_brd_setup()
183 		if (!brd_insert_page(brd, sector))  in copy_to_brd_setup()
190  * Copy n bytes from src to the brd starting at sector. Does not sleep.
193 			sector_t sector, size_t n)  in copy_to_brd()  argument
197 	unsigned int offset = (sector & (PAGE_SECTORS-1)) << SECTOR_SHIFT;  in copy_to_brd()
201 	page = brd_lookup_page(brd, sector);  in copy_to_brd()
210 		sector += copy >> SECTOR_SHIFT;  in copy_to_brd()
212 		page = brd_lookup_page(brd, sector);  in copy_to_brd()
222  * Copy n bytes to dst from the brd starting at sector. Does not sleep.
225 			sector_t sector, size_t n)  in copy_from_brd()  argument
229 	unsigned int offset = (sector & (PAGE_SECTORS-1)) << SECTOR_SHIFT;  in copy_from_brd()
233 	page = brd_lookup_page(brd, sector);  in copy_from_brd()
243 		sector += copy >> SECTOR_SHIFT;  in copy_from_brd()
245 		page = brd_lookup_page(brd, sector);  in copy_from_brd()
260 			sector_t sector)  in brd_do_bvec()  argument
266 		err = copy_to_brd_setup(brd, sector, len);  in brd_do_bvec()
273 		copy_from_brd(mem + off, brd, sector, len);  in brd_do_bvec()
277 		copy_to_brd(brd, mem + off, sector, len);  in brd_do_bvec()
288 	sector_t sector = bio->bi_iter.bi_sector;  in brd_submit_bio()  local
301 				  bio_op(bio), sector);  in brd_submit_bio()
306 		sector += len >> SECTOR_SHIFT;  in brd_submit_bio()
312 static int brd_rw_page(struct block_device *bdev, sector_t sector,  in brd_rw_page()  argument
320 	err = brd_do_bvec(brd, page, PAGE_SIZE, 0, op, sector);  in brd_rw_page()