| 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: <20180627124548.3456-7-ming.lei@redhat.com>
Date: Wed, 27 Jun 2018 20:45:30 +0800
From: Ming Lei <ming.lei@...hat.com>
To: Jens Axboe <axboe@...com>, Christoph Hellwig <hch@...radead.org>,
Kent Overstreet <kent.overstreet@...il.com>
Cc: David Sterba <dsterba@...e.cz>, Huang Ying <ying.huang@...el.com>,
Mike Snitzer <snitzer@...hat.com>,
linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
Theodore Ts'o <tytso@....edu>,
"Darrick J . Wong" <darrick.wong@...cle.com>,
Coly Li <colyli@...e.de>, Filipe Manana <fdmanana@...il.com>,
Randy Dunlap <rdunlap@...radead.org>,
Christoph Hellwig <hch@....de>
Subject: [PATCH V7 06/24] block: unexport bio_clone_bioset
From: Christoph Hellwig <hch@....de>
Now only used by the bounce code, so move it there and mark the function
static.
Reviewed-by: Ming Lei <ming.lei@...hat.com>
Signed-off-by: Christoph Hellwig <hch@....de>
---
block/bio.c | 77 -----------------------------------------------------
block/bounce.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++-
include/linux/bio.h | 1 -
3 files changed, 68 insertions(+), 79 deletions(-)
diff --git a/block/bio.c b/block/bio.c
index 9710e275f230..43698bcff737 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -645,83 +645,6 @@ struct bio *bio_clone_fast(struct bio *bio, gfp_t gfp_mask, struct bio_set *bs)
EXPORT_SYMBOL(bio_clone_fast);
/**
- * bio_clone_bioset - clone a bio
- * @bio_src: bio to clone
- * @gfp_mask: allocation priority
- * @bs: bio_set to allocate from
- *
- * Clone bio. Caller will own the returned bio, but not the actual data it
- * points to. Reference count of returned bio will be one.
- */
-struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
- struct bio_set *bs)
-{
- struct bvec_iter iter;
- struct bio_vec bv;
- struct bio *bio;
-
- /*
- * Pre immutable biovecs, __bio_clone() used to just do a memcpy from
- * bio_src->bi_io_vec to bio->bi_io_vec.
- *
- * We can't do that anymore, because:
- *
- * - The point of cloning the biovec is to produce a bio with a biovec
- * the caller can modify: bi_idx and bi_bvec_done should be 0.
- *
- * - The original bio could've had more than BIO_MAX_PAGES biovecs; if
- * we tried to clone the whole thing bio_alloc_bioset() would fail.
- * But the clone should succeed as long as the number of biovecs we
- * actually need to allocate is fewer than BIO_MAX_PAGES.
- *
- * - Lastly, bi_vcnt should not be looked at or relied upon by code
- * that does not own the bio - reason being drivers don't use it for
- * iterating over the biovec anymore, so expecting it to be kept up
- * to date (i.e. for clones that share the parent biovec) is just
- * asking for trouble and would force extra work on
- * __bio_clone_fast() anyways.
- */
-
- bio = bio_alloc_bioset(gfp_mask, bio_segments(bio_src), bs);
- if (!bio)
- return NULL;
- bio->bi_disk = bio_src->bi_disk;
- bio->bi_opf = bio_src->bi_opf;
- bio->bi_write_hint = bio_src->bi_write_hint;
- bio->bi_iter.bi_sector = bio_src->bi_iter.bi_sector;
- bio->bi_iter.bi_size = bio_src->bi_iter.bi_size;
-
- switch (bio_op(bio)) {
- case REQ_OP_DISCARD:
- case REQ_OP_SECURE_ERASE:
- case REQ_OP_WRITE_ZEROES:
- break;
- case REQ_OP_WRITE_SAME:
- bio->bi_io_vec[bio->bi_vcnt++] = bio_src->bi_io_vec[0];
- break;
- default:
- bio_for_each_segment(bv, bio_src, iter)
- bio->bi_io_vec[bio->bi_vcnt++] = bv;
- break;
- }
-
- if (bio_integrity(bio_src)) {
- int ret;
-
- ret = bio_integrity_clone(bio, bio_src, gfp_mask);
- if (ret < 0) {
- bio_put(bio);
- return NULL;
- }
- }
-
- bio_clone_blkcg_association(bio, bio_src);
-
- return bio;
-}
-EXPORT_SYMBOL(bio_clone_bioset);
-
-/**
* bio_add_pc_page - attempt to add page to bio
* @q: the target queue
* @bio: destination bio
diff --git a/block/bounce.c b/block/bounce.c
index fd31347b7836..bc63b3a2d18c 100644
--- a/block/bounce.c
+++ b/block/bounce.c
@@ -195,6 +195,73 @@ static void bounce_end_io_read_isa(struct bio *bio)
__bounce_end_io_read(bio, &isa_page_pool);
}
+static struct bio *bounce_clone_bio(struct bio *bio_src, gfp_t gfp_mask,
+ struct bio_set *bs)
+{
+ struct bvec_iter iter;
+ struct bio_vec bv;
+ struct bio *bio;
+
+ /*
+ * Pre immutable biovecs, __bio_clone() used to just do a memcpy from
+ * bio_src->bi_io_vec to bio->bi_io_vec.
+ *
+ * We can't do that anymore, because:
+ *
+ * - The point of cloning the biovec is to produce a bio with a biovec
+ * the caller can modify: bi_idx and bi_bvec_done should be 0.
+ *
+ * - The original bio could've had more than BIO_MAX_PAGES biovecs; if
+ * we tried to clone the whole thing bio_alloc_bioset() would fail.
+ * But the clone should succeed as long as the number of biovecs we
+ * actually need to allocate is fewer than BIO_MAX_PAGES.
+ *
+ * - Lastly, bi_vcnt should not be looked at or relied upon by code
+ * that does not own the bio - reason being drivers don't use it for
+ * iterating over the biovec anymore, so expecting it to be kept up
+ * to date (i.e. for clones that share the parent biovec) is just
+ * asking for trouble and would force extra work on
+ * __bio_clone_fast() anyways.
+ */
+
+ bio = bio_alloc_bioset(gfp_mask, bio_segments(bio_src), bs);
+ if (!bio)
+ return NULL;
+ bio->bi_disk = bio_src->bi_disk;
+ bio->bi_opf = bio_src->bi_opf;
+ bio->bi_write_hint = bio_src->bi_write_hint;
+ bio->bi_iter.bi_sector = bio_src->bi_iter.bi_sector;
+ bio->bi_iter.bi_size = bio_src->bi_iter.bi_size;
+
+ switch (bio_op(bio)) {
+ case REQ_OP_DISCARD:
+ case REQ_OP_SECURE_ERASE:
+ case REQ_OP_WRITE_ZEROES:
+ break;
+ case REQ_OP_WRITE_SAME:
+ bio->bi_io_vec[bio->bi_vcnt++] = bio_src->bi_io_vec[0];
+ break;
+ default:
+ bio_for_each_segment(bv, bio_src, iter)
+ bio->bi_io_vec[bio->bi_vcnt++] = bv;
+ break;
+ }
+
+ if (bio_integrity(bio_src)) {
+ int ret;
+
+ ret = bio_integrity_clone(bio, bio_src, gfp_mask);
+ if (ret < 0) {
+ bio_put(bio);
+ return NULL;
+ }
+ }
+
+ bio_clone_blkcg_association(bio, bio_src);
+
+ return bio;
+}
+
static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
mempool_t *pool)
{
@@ -222,7 +289,7 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
generic_make_request(*bio_orig);
*bio_orig = bio;
}
- bio = bio_clone_bioset(*bio_orig, GFP_NOIO, passthrough ? NULL :
+ bio = bounce_clone_bio(*bio_orig, GFP_NOIO, passthrough ? NULL :
&bounce_bio_set);
bio_for_each_segment_all(to, bio, i) {
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 430807f9f44b..21d07858ddef 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -429,7 +429,6 @@ extern void bio_put(struct bio *);
extern void __bio_clone_fast(struct bio *, struct bio *);
extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *);
-extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs);
extern struct bio_set fs_bio_set;
--
2.9.5
Powered by blists - more mailing lists