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authorKent Overstreet <kmo@daterainc.com>2013-08-08 01:31:42 +0400
committerKent Overstreet <kmo@daterainc.com>2013-11-24 10:33:55 +0400
commite90abc8ec323c1fd2a25600097ef7ae1e91f39b0 (patch)
treec144139c73f2ef56a69c4721f66f8b8f166b6157
parentc8db444820a1e37ebdca38a0210bca85f832214f (diff)
downloadlinux-e90abc8ec323c1fd2a25600097ef7ae1e91f39b0.tar.xz
block: Remove bi_idx hacks
Now that drivers have been converted to the new bvec_iter primitives, there's no need to trim the bvec before we submit it; and we can't trim it once we start sharing bvecs. It used to be that passing a partially completed bio (i.e. one with nonzero bi_idx) to generic_make_request() was a dangerous thing - various drivers would choke on such things. But with immutable biovecs and our new bio splitting that shares the biovecs, submitting partially completed bios has to work (and should work, now that all the drivers have been completed to the new primitives) Signed-off-by: Kent Overstreet <kmo@daterainc.com> Cc: Jens Axboe <axboe@kernel.dk>
-rw-r--r--drivers/md/bcache/io.c47
-rw-r--r--fs/bio.c23
2 files changed, 2 insertions, 68 deletions
diff --git a/drivers/md/bcache/io.c b/drivers/md/bcache/io.c
index 6e04f3bb0286..0f0ab659914d 100644
--- a/drivers/md/bcache/io.c
+++ b/drivers/md/bcache/io.c
@@ -11,49 +11,6 @@
#include <linux/blkdev.h>
-static void bch_bi_idx_hack_endio(struct bio *bio, int error)
-{
- struct bio *p = bio->bi_private;
-
- bio_endio(p, error);
- bio_put(bio);
-}
-
-static void bch_generic_make_request_hack(struct bio *bio)
-{
- if (bio->bi_iter.bi_idx) {
- struct bio_vec bv;
- struct bvec_iter iter;
- unsigned segs = bio_segments(bio);
- struct bio *clone = bio_alloc(GFP_NOIO, segs);
-
- bio_for_each_segment(bv, bio, iter)
- clone->bi_io_vec[clone->bi_vcnt++] = bv;
-
- clone->bi_iter.bi_sector = bio->bi_iter.bi_sector;
- clone->bi_bdev = bio->bi_bdev;
- clone->bi_rw = bio->bi_rw;
- clone->bi_vcnt = segs;
- clone->bi_iter.bi_size = bio->bi_iter.bi_size;
-
- clone->bi_private = bio;
- clone->bi_end_io = bch_bi_idx_hack_endio;
-
- bio = clone;
- }
-
- /*
- * Hack, since drivers that clone bios clone up to bi_max_vecs, but our
- * bios might have had more than that (before we split them per device
- * limitations).
- *
- * To be taken out once immutable bvec stuff is in.
- */
- bio->bi_max_vecs = bio->bi_vcnt;
-
- generic_make_request(bio);
-}
-
/**
* bch_bio_split - split a bio
* @bio: bio to split
@@ -222,12 +179,12 @@ void bch_generic_make_request(struct bio *bio, struct bio_split_pool *p)
n->bi_private = &s->cl;
closure_get(&s->cl);
- bch_generic_make_request_hack(n);
+ generic_make_request(n);
} while (n != bio);
continue_at(&s->cl, bch_bio_submit_split_done, NULL);
submit:
- bch_generic_make_request_hack(bio);
+ generic_make_request(bio);
}
/* Bios with headers */
diff --git a/fs/bio.c b/fs/bio.c
index 9cff939b1bc6..e6dfa06773ac 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -1822,11 +1822,7 @@ void bio_trim(struct bio *bio, int offset, int size)
{
/* 'bio' is a cloned bio which we need to trim to match
* the given offset and size.
- * This requires adjusting bi_sector, bi_size, and bi_io_vec
*/
- int i;
- struct bio_vec *bvec;
- int sofar = 0;
size <<= 9;
if (offset == 0 && size == bio->bi_iter.bi_size)
@@ -1837,25 +1833,6 @@ void bio_trim(struct bio *bio, int offset, int size)
bio_advance(bio, offset << 9);
bio->bi_iter.bi_size = size;
-
- /* avoid any complications with bi_idx being non-zero*/
- if (bio->bi_iter.bi_idx) {
- memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_iter.bi_idx,
- (bio->bi_vcnt - bio->bi_iter.bi_idx) *
- sizeof(struct bio_vec));
- bio->bi_vcnt -= bio->bi_iter.bi_idx;
- bio->bi_iter.bi_idx = 0;
- }
- /* Make sure vcnt and last bv are not too big */
- bio_for_each_segment_all(bvec, bio, i) {
- if (sofar + bvec->bv_len > size)
- bvec->bv_len = size - sofar;
- if (bvec->bv_len == 0) {
- bio->bi_vcnt = i;
- break;
- }
- sofar += bvec->bv_len;
- }
}
EXPORT_SYMBOL_GPL(bio_trim);