diff options
Diffstat (limited to 'libbcache/util.h')
| -rw-r--r-- | libbcache/util.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/libbcache/util.h b/libbcache/util.h index 2b171a1..88cbe30 100644 --- a/libbcache/util.h +++ b/libbcache/util.h @@ -1,6 +1,7 @@ #ifndef _BCACHE_UTIL_H #define _BCACHE_UTIL_H +#include <linux/bio.h> #include <linux/blkdev.h> #include <linux/errno.h> #include <linux/blkdev.h> @@ -722,4 +723,33 @@ static inline void memmove_u64s(void *dst, const void *src, __memmove_u64s_up(dst, src, u64s); } +static inline struct bio_vec next_contig_bvec(struct bio *bio, + struct bvec_iter *iter) +{ + struct bio_vec bv = bio_iter_iovec(bio, *iter); + + bio_advance_iter(bio, iter, bv.bv_len); +#ifndef CONFIG_HIGHMEM + while (iter->bi_size) { + struct bio_vec next = bio_iter_iovec(bio, *iter); + + if (page_address(bv.bv_page) + bv.bv_offset + bv.bv_len != + page_address(next.bv_page) + next.bv_offset) + break; + + bv.bv_len += next.bv_len; + bio_advance_iter(bio, iter, next.bv_len); + } +#endif + return bv; +} + +#define __bio_for_each_contig_segment(bv, bio, iter, start) \ + for (iter = (start); \ + (iter).bi_size && \ + ((bv = next_contig_bvec((bio), &(iter))), 1);) + +#define bio_for_each_contig_segment(bv, bio, iter) \ + __bio_for_each_contig_segment(bv, bio, iter, (bio)->bi_iter) + #endif /* _BCACHE_UTIL_H */ |