[PATCH v3 09/49] block: comment on bio_iov_iter_get_pages()
From: Ming Lei <hidden>
Date: 2017-08-08 08:45:08
Also in:
linux-fsdevel, linux-mm, lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
bio_iov_iter_get_pages() used unused bvec spaces for storing page pointer array temporarily, and this patch comments on this usage wrt. multipage bvec support. Signed-off-by: Ming Lei <redacted> --- block/bio.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/block/bio.c b/block/bio.c
index 826b5d173416..28697e3c8ce3 100644
--- a/block/bio.c
+++ b/block/bio.c@@ -875,6 +875,10 @@ EXPORT_SYMBOL(bio_add_page); * * Pins as many pages from *iter and appends them to @bio's bvec array. The * pages will have to be released using put_page() when done. + * + * The hacking way of using bvec table as page pointer array is safe + * even after multipage bvec is introduced because that space can be + * thought as unused by bio_add_page(). */ int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) {
--
2.9.4