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@xxxxxxxxxx>
---
fs/bio.c | 3 ++-
include/linux/bio.h | 5 -----
include/linux/blk_types.h | 1 +
3 files changed, 3 insertions(+), 6 deletions(-)
diff --git a/fs/bio.c b/fs/bio.c
index ebc7309..ff34311 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -249,7 +249,7 @@ void bio_free(struct bio *bio)
return;
}
- if (bio_has_allocated_vec(bio))
+ if (bio_flagged(bio, BIO_OWNS_VEC))
bvec_free_bs(bs, bio->bi_io_vec, BIO_POOL_IDX(bio));
if (bio_integrity(bio))
@@ -321,6 +321,7 @@ 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_OWNS_VEC;
}
out_set:
bio->bi_flags |= idx << BIO_POOL_OFFSET;
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 393c87e..484b96e 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -84,11 +84,6 @@ static inline void *bio_data(struct bio *bio)
return NULL;
}
-static inline int bio_has_allocated_vec(struct bio *bio)
-{
- return bio->bi_io_vec && bio->bi_io_vec != bio->bi_inline_vecs;
-}
-
/*
* will die
*/
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index d10c2e49..416aae4 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -113,6 +113,7 @@ struct bio {
#define BIO_MAPPED_INTEGRITY 11/* integrity metadata has been remapped */
#define BIO_RESET_BITS 12 /* Flags starting here get preserved by bio_reset() */
+#define BIO_OWNS_VEC 12 /* bio_free() should free bvec */
#define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag)))
--
1.7.7.3
--
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