39 	struct dm_target *ti;  member
59 static struct switch_ctx *alloc_switch_ctx(struct dm_target *ti, unsigned nr_paths,  in alloc_switch_ctx()  argument
69 	sctx->ti = ti;  in alloc_switch_ctx()
72 	ti->private = sctx;  in alloc_switch_ctx()
77 static int alloc_region_table(struct dm_target *ti, unsigned nr_paths)  in alloc_region_table()  argument
79 	struct switch_ctx *sctx = ti->private;  in alloc_region_table()
80 	sector_t nr_regions = ti->len;  in alloc_region_table()
104 		ti->error = "Region table too large";  in alloc_region_table()
113 		ti->error = "Region table too large";  in alloc_region_table()
119 		ti->error = "Cannot allocate region table";  in alloc_region_table()
204 static int parse_path(struct dm_arg_set *as, struct dm_target *ti)  in parse_path()  argument
206 	struct switch_ctx *sctx = ti->private;  in parse_path()
210 	r = dm_get_device(ti, dm_shift_arg(as), dm_table_get_mode(ti->table),  in parse_path()
213 		ti->error = "Device lookup failed";  in parse_path()
218 		ti->error = "Invalid device starting offset";  in parse_path()
219 		dm_put_device(ti, sctx->path_list[sctx->nr_paths].dmdev);  in parse_path()
233 static void switch_dtr(struct dm_target *ti)  in switch_dtr()  argument
235 	struct switch_ctx *sctx = ti->private;  in switch_dtr()
238 		dm_put_device(ti, sctx->path_list[sctx->nr_paths].dmdev);  in switch_dtr()
252 static int switch_ctr(struct dm_target *ti, unsigned argc, char **argv)  in switch_ctr()  argument
268 	r = dm_read_arg(_args, &as, &nr_paths, &ti->error);  in switch_ctr()
272 	r = dm_read_arg(_args + 1, &as, &region_size, &ti->error);  in switch_ctr()
276 	r = dm_read_arg_group(_args + 2, &as, &nr_optional_args, &ti->error);  in switch_ctr()
282 		ti->error = "Incorrect number of path arguments";  in switch_ctr()
286 	sctx = alloc_switch_ctx(ti, nr_paths, region_size);  in switch_ctr()
288 		ti->error = "Cannot allocate redirection context";  in switch_ctr()
292 	r = dm_set_target_max_io_len(ti, region_size);  in switch_ctr()
297 		r = parse_path(&as, ti);  in switch_ctr()
302 	r = alloc_region_table(ti, nr_paths);  in switch_ctr()
309 	ti->num_discard_bios = 1;  in switch_ctr()
314 	switch_dtr(ti);  in switch_ctr()
319 static int switch_map(struct dm_target *ti, struct bio *bio)  in switch_map()  argument
321 	struct switch_ctx *sctx = ti->private;  in switch_map()
322 	sector_t offset = dm_target_offset(ti, bio->bi_iter.bi_sector);  in switch_map()
469 static int switch_message(struct dm_target *ti, unsigned argc, char **argv)  in switch_message()  argument
473 	struct switch_ctx *sctx = ti->private;  in switch_message()
488 static void switch_status(struct dm_target *ti, status_type_t type,  in switch_status()  argument
491 	struct switch_ctx *sctx = ti->private;  in switch_status()
514 static int switch_ioctl(struct dm_target *ti, unsigned cmd,  in switch_ioctl()  argument
517 	struct switch_ctx *sctx = ti->private;  in switch_ioctl()
531 	if (ti->len + sctx->path_list[path_nr].start != i_size_read(bdev->bd_inode) >> SECTOR_SHIFT)  in switch_ioctl()
537 static int switch_iterate_devices(struct dm_target *ti,  in switch_iterate_devices()  argument
540 	struct switch_ctx *sctx = ti->private;  in switch_iterate_devices()
545 		r = fn(ti, sctx->path_list[path_nr].dmdev,  in switch_iterate_devices()
546 			 sctx->path_list[path_nr].start, ti->len, data);  in switch_iterate_devices()