diff options
Diffstat (limited to 'drivers/md/dm-bio-prison-v1.h')
| -rw-r--r-- | drivers/md/dm-bio-prison-v1.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/md/dm-bio-prison-v1.h b/drivers/md/dm-bio-prison-v1.h index dfbf1e94cb75..2a097ed0d85e 100644 --- a/drivers/md/dm-bio-prison-v1.h +++ b/drivers/md/dm-bio-prison-v1.h @@ -35,6 +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. */ @@ -74,6 +84,11 @@ int dm_get_cell(struct dm_bio_prison *prison, struct dm_bio_prison_cell **cell_result); /* + * Returns false if key is beyond BIO_PRISON_MAX_RANGE or spans a boundary. + */ +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 * bio to it. * |