Now the check for deciding if one page is mergeable to current bvec
becomes a bit complicated, and we need to reuse the code before
adding pc page.
So move the check in one dedicated helper.
No function change.
Cc: Omar Sandoval <osandov@xxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
block/bio.c | 38 ++++++++++++++++++++++++--------------
1 file changed, 24 insertions(+), 14 deletions(-)
diff --git a/block/bio.c b/block/bio.c
index cbd202250a32..7ab7060a0e6c 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -647,6 +647,24 @@ struct bio *bio_clone_fast(struct bio *bio, gfp_t gfp_mask, struct bio_set *bs)
}
EXPORT_SYMBOL(bio_clone_fast);
+static inline bool page_is_mergeable(const struct bio_vec *bv,
+ struct page *page, unsigned int len, unsigned int off,
+ bool same_page)
+{
+ phys_addr_t vec_end_addr = page_to_phys(bv->bv_page) +
+ bv->bv_offset + bv->bv_len - 1;
+ phys_addr_t page_addr = page_to_phys(page);
+
+ if (vec_end_addr + 1 != page_addr + off)
+ return false;
+ if (xen_domain() && !xen_biovec_phys_mergeable(bv, page))
+ return false;
+ if (same_page && (vec_end_addr & PAGE_MASK) != page_addr)
+ return false;
+
+ return true;
+}
+
/**
* bio_add_pc_page - attempt to add page to passthrough bio
* @q: the target queue
@@ -770,20 +788,12 @@ bool __bio_try_merge_page(struct bio *bio, struct page *page,
if (bio->bi_vcnt > 0) {
struct bio_vec *bv = &bio->bi_io_vec[bio->bi_vcnt - 1];
- phys_addr_t vec_end_addr = page_to_phys(bv->bv_page) +
- bv->bv_offset + bv->bv_len - 1;
- phys_addr_t page_addr = page_to_phys(page);
-
- if (vec_end_addr + 1 != page_addr + off)
- return false;
- if (xen_domain() && !xen_biovec_phys_mergeable(bv, page))
- return false;
- if (same_page && (vec_end_addr & PAGE_MASK) != page_addr)
- return false;
-
- bv->bv_len += len;
- bio->bi_iter.bi_size += len;
- return true;
+
+ if (page_is_mergeable(bv, page, len, off, same_page)) {
+ bv->bv_len += len;
+ bio->bi_iter.bi_size += len;
+ return true;
+ }
}
return false;
}
--
2.9.5
