diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/bio.h | 11 | ||||
| -rw-r--r-- | include/linux/blk_types.h | 3 |
2 files changed, 13 insertions, 1 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index da3a127c9958..8bfe9eee6d1a 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -645,6 +645,17 @@ static inline struct bio *bio_list_get(struct bio_list *bl) } /* + * Increment chain count for the bio. Make sure the CHAIN flag update + * is visible before the raised count. + */ +static inline void bio_inc_remaining(struct bio *bio) +{ + bio->bi_flags |= (1 << BIO_CHAIN); + smp_mb__before_atomic(); + atomic_inc(&bio->__bi_remaining); +} + +/* * bio_set is used to allow other portions of the IO system to * allocate their own private memory pools for bio and iovec structures. * These memory pools in turn all allocate from the bio_slab diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index a1b25e35ea5f..8b07e0603887 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -65,7 +65,7 @@ struct bio { unsigned int bi_seg_front_size; unsigned int bi_seg_back_size; - atomic_t bi_remaining; + atomic_t __bi_remaining; bio_end_io_t *bi_end_io; @@ -122,6 +122,7 @@ struct bio { #define BIO_NULL_MAPPED 8 /* contains invalid user pages */ #define BIO_QUIET 9 /* Make BIO Quiet */ #define BIO_SNAP_STABLE 10 /* bio data must be snapshotted during write */ +#define BIO_CHAIN 11 /* chained bio, ->bi_remaining in effect */ /* * Flags starting here get preserved by bio_reset() - this includes |