diff options
Diffstat (limited to 'drivers/md/dm-bio-prison.h')
| -rw-r--r-- | drivers/md/dm-bio-prison.h | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/md/dm-bio-prison.h b/drivers/md/dm-bio-prison.h index b03988667740..74cf01144b1f 100644 --- a/drivers/md/dm-bio-prison.h +++ b/drivers/md/dm-bio-prison.h @@ -23,11 +23,14 @@ */ struct dm_bio_prison; -/* FIXME: this needs to be more abstract */ +/* + * Keys define a range of blocks within either a virtual or physical + * device. + */ struct dm_cell_key { int virtual; dm_thin_id dev; - dm_block_t block; + dm_block_t block_begin, block_end; }; /* @@ -59,7 +62,7 @@ void dm_bio_prison_free_cell(struct dm_bio_prison *prison, struct dm_bio_prison_cell *cell); /* - * Creates, or retrieves a cell for the given key. + * 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. @@ -70,7 +73,8 @@ int dm_get_cell(struct dm_bio_prison *prison, struct dm_bio_prison_cell **cell_result); /* - * An atomic op that combines retrieving a cell, and adding a bio to it. + * An atomic op that combines retrieving or creating a cell, and adding a + * bio to it. * * Returns 1 if the cell was already held, 0 if @inmate is the new holder. */ |