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bio: allow individual slabs in the bio_set

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Instead of having a global bio slab cache, add a reference to one
in each bio_set that is created. This allows for personalized slabs
in each bio_set, so that they can have bios of different sizes.

This means we can personalize the bios we return. File systems may
want to embed the bio inside another structure, to avoid allocation
more items (and stuffing them in ->bi_private) after the get a bio.
Or we may want to embed a number of bio_vecs directly at the end
of a bio, to avoid doing two allocations to return a bio. This is now
possible.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
2008-12-10 15:35:05 +01:00
parent 1b43449869
commit bb799ca020
6 changed files with 170 additions and 35 deletions
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2
drivers/md/dm-io.c
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@@ -56,7 +56,7 @@ struct dm_io_client *dm_io_client_create(unsigned num_pages)
if (!client->pool)
goto bad;
client->bios = bioset_create(16, 16);
client->bios = bioset_create(16, 0);
if (!client->bios)
goto bad;