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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 05-18-2012, 02:59 AM
 
Default block: Add an explicit bio flag for bios that own their bvec

From: Kent Overstreet <koverstreet@google.com>

This is for the new bio splitting code. When we split a bio, if the
split occured on a bvec boundry we reuse the bvec for the new bio. But
that means bio_free() can't free it, hence the explicit flag.

Signed-off-by: Kent Overstreet <koverstreet@google.com>
---
fs/bio.c | 3 ++-
include/linux/blk_types.h | 1 +
2 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/fs/bio.c b/fs/bio.c
index ecc9088..3332800 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -234,7 +234,7 @@ void bio_free(struct bio *bio, struct bio_set *bs)
{
void *p;

- if (bio_has_allocated_vec(bio))
+ if (bio_flagged(bio, BIO_HAS_VEC))
bvec_free_bs(bs, bio->bi_io_vec, BIO_POOL_IDX(bio));

if (bio_integrity(bio))
@@ -305,6 +305,7 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs)
goto err_free;

nr_iovecs = bvec_nr_vecs(idx);
+ bio->bi_flags |= 1 << BIO_HAS_VEC;
}
out_set:
bio->bi_flags |= idx << BIO_POOL_OFFSET;
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index bd9a610..10fca21 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -101,6 +101,7 @@ struct bio {
#define BIO_FS_INTEGRITY 9 /* fs owns integrity data, not block layer */
#define BIO_QUIET 10 /* Make BIO Quiet */
#define BIO_MAPPED_INTEGRITY 11/* integrity metadata has been remapped */
+#define BIO_HAS_VEC 12 /* bio_free() should free bvec */
#define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))

/*
--
1.7.9.rc2

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