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| author | Tejun Heo <tj@kernel.org> | 2009-04-15 19:50:51 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-04-22 08:35:10 +0200 |
| commit | 451a9ebf653d28337ba53ed5b4b70b0b9543cca1 (patch) | |
| tree | ab203dfb628623483a1aeb7ead564ea35ad21d29 /include/linux/bio.h | |
| parent | cd0aca2d550f238d80ba58e7dcade4ea3d0a3aa7 (diff) | |
| download | linux-451a9ebf653d28337ba53ed5b4b70b0b9543cca1.tar.gz linux-451a9ebf653d28337ba53ed5b4b70b0b9543cca1.tar.xz | |
bio: fix bio_kmalloc()
Impact: fix bio_kmalloc() and its destruction path
bio_kmalloc() was broken in two ways.
* bvec_alloc_bs() first allocates bvec using kmalloc() and then
ignores it and allocates again like non-kmalloc bvecs.
* bio_kmalloc_destructor() didn't check for and free bio integrity
data.
This patch fixes the above problems. kmalloc patch is separated out
from bio_alloc_bioset() and allocates the requested number of bvecs as
inline bvecs.
* bio_alloc_bioset() no longer takes NULL @bs. None other than
bio_kmalloc() used it and outside users can't know how it was
allocated anyway.
* Define and use BIO_POOL_NONE so that pool index check in
bvec_free_bs() triggers if inline or kmalloc allocated bvec gets
there.
* Relocate destructors on top of each allocation function so that how
they're used is more clear.
Jens Axboe suggested allocating bvecs inline.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/linux/bio.h')
| -rw-r--r-- | include/linux/bio.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index b89cf2d82898..7b214fd672a2 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -132,6 +132,7 @@ struct bio { * top 4 bits of bio flags indicate the pool this bio came from */ #define BIO_POOL_BITS (4) +#define BIO_POOL_NONE ((1UL << BIO_POOL_BITS) - 1) #define BIO_POOL_OFFSET (BITS_PER_LONG - BIO_POOL_BITS) #define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET) #define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET) |