Jens Axboe <[email protected]> writes:
> On Sat, Jul 23 2005, Peter Osterlund wrote:
> > Jens Axboe <[email protected]> writes:
> >
> > > Dunno why I didn't notice before, but ->bi_set is totally unnecessary
> > > bloat of struct bio. Just define a proper destructor for the bio and it
> > > already knows what bio_set it belongs too.
> >
> > This causes crashes on my computer.
>
> Did I neglect to mention it was untested? :)
...
> Thanks, I'll go over these and submit a fixed version.
I fixed this myself. The patch below is tested with dm-crypt on top of
pktcdvd on top of usb-storage, and worked fine in my tests.
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Peter Osterlund <[email protected]>
---
drivers/md/dm-io.c | 6 ++++++
drivers/md/dm.c | 6 ++++++
fs/bio.c | 32 +++++++++++++++++++++-----------
include/linux/bio.h | 2 +-
4 files changed, 34 insertions(+), 12 deletions(-)
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -239,6 +239,11 @@ static void vm_dp_init(struct dpages *dp
dp->context_ptr = data;
}
+static void dm_bio_destructor(struct bio *bio)
+{
+ bio_free(bio, _bios);
+}
+
/*-----------------------------------------------------------------
* IO routines that accept a list of pages.
*---------------------------------------------------------------*/
@@ -263,6 +268,7 @@ static void do_region(int rw, unsigned i
bio->bi_bdev = where->bdev;
bio->bi_end_io = endio;
bio->bi_private = io;
+ bio->bi_destructor = dm_bio_destructor;
bio_set_region(bio, region);
/*
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -399,6 +399,11 @@ struct clone_info {
unsigned short idx;
};
+static void dm_bio_destructor(struct bio *bio)
+{
+ bio_free(bio, dm_set);
+}
+
/*
* Creates a little bio that is just does part of a bvec.
*/
@@ -410,6 +415,7 @@ static struct bio *split_bvec(struct bio
struct bio_vec *bv = bio->bi_io_vec + idx;
clone = bio_alloc_bioset(GFP_NOIO, 1, dm_set);
+ clone->bi_destructor = dm_bio_destructor;
*clone->bi_io_vec = *bv;
clone->bi_sector = sector;
diff --git a/fs/bio.c b/fs/bio.c
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -104,18 +104,22 @@ static inline struct bio_vec *bvec_alloc
return bvl;
}
-/*
- * default destructor for a bio allocated with bio_alloc_bioset()
- */
-static void bio_destructor(struct bio *bio)
+void bio_free(struct bio *bio, struct bio_set *bio_set)
{
const int pool_idx = BIO_POOL_IDX(bio);
- struct bio_set *bs = bio->bi_set;
BIO_BUG_ON(pool_idx >= BIOVEC_NR_POOLS);
- mempool_free(bio->bi_io_vec, bs->bvec_pools[pool_idx]);
- mempool_free(bio, bs->bio_pool);
+ mempool_free(bio->bi_io_vec, bio_set->bvec_pools[pool_idx]);
+ mempool_free(bio, bio_set->bio_pool);
+}
+
+/*
+ * default destructor for a bio allocated with bio_alloc_bioset()
+ */
+static void bio_fs_destructor(struct bio *bio)
+{
+ bio_free(bio, fs_bio_set);
}
inline void bio_init(struct bio *bio)
@@ -171,8 +175,6 @@ struct bio *bio_alloc_bioset(unsigned in
bio->bi_max_vecs = bvec_slabs[idx].nr_vecs;
}
bio->bi_io_vec = bvl;
- bio->bi_destructor = bio_destructor;
- bio->bi_set = bs;
}
out:
return bio;
@@ -180,7 +182,12 @@ out:
struct bio *bio_alloc(unsigned int __nocast gfp_mask, int nr_iovecs)
{
- return bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);
+ struct bio *bio = bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);
+
+ if (bio)
+ bio->bi_destructor = bio_fs_destructor;
+
+ return bio;
}
void zero_fill_bio(struct bio *bio)
@@ -276,8 +283,10 @@ struct bio *bio_clone(struct bio *bio, u
{
struct bio *b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, fs_bio_set);
- if (b)
+ if (b) {
+ b->bi_destructor = bio_fs_destructor;
__bio_clone(b, bio);
+ }
return b;
}
@@ -1078,6 +1087,7 @@ subsys_initcall(init_bio);
EXPORT_SYMBOL(bio_alloc);
EXPORT_SYMBOL(bio_put);
+EXPORT_SYMBOL(bio_free);
EXPORT_SYMBOL(bio_endio);
EXPORT_SYMBOL(bio_init);
EXPORT_SYMBOL(__bio_clone);
diff --git a/include/linux/bio.h b/include/linux/bio.h
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -111,7 +111,6 @@ struct bio {
void *bi_private;
bio_destructor_t *bi_destructor; /* destructor */
- struct bio_set *bi_set; /* memory pools set */
};
/*
@@ -280,6 +279,7 @@ extern void bioset_free(struct bio_set *
extern struct bio *bio_alloc(unsigned int __nocast, int);
extern struct bio *bio_alloc_bioset(unsigned int __nocast, int, struct bio_set *);
extern void bio_put(struct bio *);
+extern void bio_free(struct bio *, struct bio_set *);
extern void bio_endio(struct bio *, unsigned int, int);
struct request_queue;
--
Peter Osterlund - [email protected]
http://web.telia.com/~u89404340
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