diff options
Diffstat (limited to 'drivers/md/dm-bio-prison-v1.h')
| -rw-r--r-- | drivers/md/dm-bio-prison-v1.h | 34 |
1 files changed, 13 insertions, 21 deletions
diff --git a/drivers/md/dm-bio-prison-v1.h b/drivers/md/dm-bio-prison-v1.h index cec52ac5e1ae..d39706c48447 100644 --- a/drivers/md/dm-bio-prison-v1.h +++ b/drivers/md/dm-bio-prison-v1.h @@ -1,3 +1,4 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2011-2017 Red Hat, Inc. * @@ -34,6 +35,16 @@ struct dm_cell_key { }; /* + * The range of a key (block_end - block_begin) must not + * exceed BIO_PRISON_MAX_RANGE. Also the range must not + * cross a similarly sized boundary. + * + * Must be a power of 2. + */ +#define BIO_PRISON_MAX_RANGE 1024 +#define BIO_PRISON_MAX_RANGE_SHIFT 10 + +/* * Treat this as opaque, only in header so callers can manage allocation * themselves. */ @@ -62,15 +73,9 @@ void dm_bio_prison_free_cell(struct dm_bio_prison *prison, struct dm_bio_prison_cell *cell); /* - * Creates, or retrieves a cell that overlaps the given key. - * - * Returns 1 if pre-existing cell returned, zero if new cell created using - * @cell_prealloc. + * Returns false if key is beyond BIO_PRISON_MAX_RANGE or spans a boundary. */ -int dm_get_cell(struct dm_bio_prison *prison, - struct dm_cell_key *key, - struct dm_bio_prison_cell *cell_prealloc, - struct dm_bio_prison_cell **cell_result); +bool dm_cell_key_has_valid_range(struct dm_cell_key *key); /* * An atomic op that combines retrieving or creating a cell, and adding a @@ -101,19 +106,6 @@ void dm_cell_visit_release(struct dm_bio_prison *prison, void (*visit_fn)(void *, struct dm_bio_prison_cell *), void *context, struct dm_bio_prison_cell *cell); -/* - * Rather than always releasing the prisoners in a cell, the client may - * want to promote one of them to be the new holder. There is a race here - * though between releasing an empty cell, and other threads adding new - * inmates. So this function makes the decision with its lock held. - * - * This function can have two outcomes: - * i) An inmate is promoted to be the holder of the cell (return value of 0). - * ii) The cell has no inmate for promotion and is released (return value of 1). - */ -int dm_cell_promote_or_release(struct dm_bio_prison *prison, - struct dm_bio_prison_cell *cell); - /*----------------------------------------------------------------*/ /* |