50  * Look up and return a brd's page for a given sector.
52 static struct page *brd_lookup_page(struct brd_device *brd, sector_t sector)  in brd_lookup_page()  argument
57 	idx = sector >> PAGE_SECTORS_SHIFT; /* sector to page index */  in brd_lookup_page()
66  * Insert a new page for a given sector, if one does not already exist.
68 static int brd_insert_page(struct brd_device *brd, sector_t sector, gfp_t gfp)  in brd_insert_page()  argument
74 	page = brd_lookup_page(brd, sector);  in brd_insert_page()
84 	idx = sector >> PAGE_SECTORS_SHIFT;  in brd_insert_page()
123 static int copy_to_brd_setup(struct brd_device *brd, sector_t sector, size_t n,  in copy_to_brd_setup()  argument
126 	unsigned int offset = (sector & (PAGE_SECTORS-1)) << SECTOR_SHIFT;  in copy_to_brd_setup()
131 	ret = brd_insert_page(brd, sector, gfp);  in copy_to_brd_setup()
135 		sector += copy >> SECTOR_SHIFT;  in copy_to_brd_setup()
136 		ret = brd_insert_page(brd, sector, gfp);  in copy_to_brd_setup()
142  * Copy n bytes from src to the brd starting at sector. Does not sleep.
145 			sector_t sector, size_t n)  in copy_to_brd()  argument
149 	unsigned int offset = (sector & (PAGE_SECTORS-1)) << SECTOR_SHIFT;  in copy_to_brd()
153 	page = brd_lookup_page(brd, sector);  in copy_to_brd()
162 		sector += copy >> SECTOR_SHIFT;  in copy_to_brd()
164 		page = brd_lookup_page(brd, sector);  in copy_to_brd()
174  * Copy n bytes to dst from the brd starting at sector. Does not sleep.
177 			sector_t sector, size_t n)  in copy_from_brd()  argument
181 	unsigned int offset = (sector & (PAGE_SECTORS-1)) << SECTOR_SHIFT;  in copy_from_brd()
185 	page = brd_lookup_page(brd, sector);  in copy_from_brd()
195 		sector += copy >> SECTOR_SHIFT;  in copy_from_brd()
197 		page = brd_lookup_page(brd, sector);  in copy_from_brd()
212 			sector_t sector)  in brd_do_bvec()  argument
224 		err = copy_to_brd_setup(brd, sector, len, gfp);  in brd_do_bvec()
231 		copy_from_brd(mem + off, brd, sector, len);  in brd_do_bvec()
235 		copy_to_brd(brd, mem + off, sector, len);  in brd_do_bvec()
246 	sector_t sector = bio->bi_iter.bi_sector;  in brd_submit_bio()  local
259 				  bio->bi_opf, sector);  in brd_submit_bio()
268 		sector += len >> SECTOR_SHIFT;  in brd_submit_bio()