| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1337977539-16977-6-git-send-email-koverstreet@google.com>
Date: Fri, 25 May 2012 13:25:28 -0700
From: Kent Overstreet <koverstreet@...gle.com>
To: linux-kernel@...r.kernel.org, linux-bcache@...r.kernel.org,
dm-devel@...hat.com, linux-fsdevel@...r.kernel.org
Cc: Kent Overstreet <koverstreet@...gle.com>, tj@...nel.org,
axboe@...nel.dk, agk@...hat.com, neilb@...e.de,
drbd-dev@...ts.linbit.com, bharrosh@...asas.com, vgoyal@...hat.com,
mpatocka@...hat.com, sage@...dream.net, yehuda@...newdream.net
Subject: [PATCH v3 05/16] block: Kill bi_destructor
Now that we've got generic code for freeing bios allocated from bio
pools, this isn't needed anymore.
This also changes the semantics of bio_free() a bit - it now also frees
bios allocated by bio_kmalloc(). It's also no longer exported, as
without bi_destructor there should be no need for it to be called
anywhere else.
Signed-off-by: Kent Overstreet <koverstreet@...gle.com>
Change-Id: Iade939e76ff329cb03eef9125e4377ba1e4265c5
---
Documentation/block/biodoc.txt | 5 -----
fs/bio.c | 33 +++++++++++++++------------------
include/linux/bio.h | 1 -
include/linux/blk_types.h | 3 ---
4 files changed, 15 insertions(+), 27 deletions(-)
diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt
index e418dc0..8df5e8e 100644
--- a/Documentation/block/biodoc.txt
+++ b/Documentation/block/biodoc.txt
@@ -465,7 +465,6 @@ struct bio {
bio_end_io_t *bi_end_io; /* bi_end_io (bio) */
atomic_t bi_cnt; /* pin count: free when it hits zero */
void *bi_private;
- bio_destructor_t *bi_destructor; /* bi_destructor (bio) */
};
With this multipage bio design:
@@ -647,10 +646,6 @@ for a non-clone bio. There are the 6 pools setup for different size biovecs,
so bio_alloc(gfp_mask, nr_iovecs) will allocate a vec_list of the
given size from these slabs.
-The bi_destructor() routine takes into account the possibility of the bio
-having originated from a different source (see later discussions on
-n/w to block transfers and kvec_cb)
-
The bio_get() routine may be used to hold an extra reference on a bio prior
to i/o submission, if the bio fields are likely to be accessed after the
i/o is issued (since the bio may otherwise get freed in case i/o completion
diff --git a/fs/bio.c b/fs/bio.c
index 240da21..4075171 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -230,10 +230,19 @@ fallback:
return bvl;
}
-void bio_free(struct bio *bio, struct bio_set *bs)
+static void bio_free(struct bio *bio)
{
+ struct bio_set *bs = bio->bi_pool;
void *p;
+ if (!bs) {
+ /* Bio was allocated by bio_kmalloc() */
+ if (bio_integrity(bio))
+ bio_integrity_free(bio, fs_bio_set);
+ kfree(bio);
+ return;
+ }
+
if (bio_has_allocated_vec(bio))
bvec_free_bs(bs, bio->bi_io_vec, BIO_POOL_IDX(bio));
@@ -249,7 +258,6 @@ void bio_free(struct bio *bio, struct bio_set *bs)
mempool_free(p, bs->bio_pool);
}
-EXPORT_SYMBOL(bio_free);
void bio_init(struct bio *bio)
{
@@ -343,13 +351,6 @@ struct bio *bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs)
}
EXPORT_SYMBOL(bio_alloc);
-static void bio_kmalloc_destructor(struct bio *bio)
-{
- if (bio_integrity(bio))
- bio_integrity_free(bio, fs_bio_set);
- kfree(bio);
-}
-
/**
* bio_kmalloc - allocate a bio for I/O using kmalloc()
* @gfp_mask: the GFP_ mask given to the slab allocator
@@ -376,7 +377,6 @@ struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned int nr_iovecs)
bio->bi_flags |= BIO_POOL_NONE << BIO_POOL_OFFSET;
bio->bi_max_vecs = nr_iovecs;
bio->bi_io_vec = bio->bi_inline_vecs;
- bio->bi_destructor = bio_kmalloc_destructor;
return bio;
}
@@ -411,15 +411,12 @@ void bio_put(struct bio *bio)
/*
* last put frees it
+ *
+ * bio->bi_pool will be NULL if the bio was allocated by bio_kmalloc() -
+ * bio_free() handles that case too.
*/
- if (atomic_dec_and_test(&bio->bi_cnt)) {
- bio->bi_next = NULL;
-
- if (bio->bi_pool)
- bio_free(bio, bio->bi_pool);
- else
- bio->bi_destructor(bio);
- }
+ if (atomic_dec_and_test(&bio->bi_cnt))
+ bio_free(bio);
}
EXPORT_SYMBOL(bio_put);
diff --git a/include/linux/bio.h b/include/linux/bio.h
index e5c2504..242447c 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -216,7 +216,6 @@ extern struct bio *bio_alloc(gfp_t, unsigned int);
extern struct bio *bio_kmalloc(gfp_t, unsigned int);
extern struct bio *bio_alloc_bioset(gfp_t, 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 *, int);
struct request_queue;
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 6b7daf3..b6ddbf1 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -74,11 +74,8 @@ struct bio {
struct bio_integrity_payload *bi_integrity; /* data integrity */
#endif
- /* If bi_pool is non NULL, bi_destructor is not called */
struct bio_set *bi_pool;
- bio_destructor_t *bi_destructor; /* destructor */
-
/*
* We can inline a number of vecs at the end of the bio, to avoid
* double allocations for a small number of bio_vecs. This member
--
1.7.9.3.327.g2980b
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists