[PATCH v1 09/54] block: comment on bio_iov_iter_get_pages()
STALE3547d
From: Ming Lei <tom.leiming@gmail.com>
Date: 2016-12-27 16:01:28
Also in:
lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
Revision v1 of 2 in this series.
Revisions (2)
- v1 [diff vs current]
- v1 current
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 <tom.leiming@gmail.com> --- block/bio.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/block/bio.c b/block/bio.c
index d4a1e0b63ea0..10398969353b 100644
--- a/block/bio.c
+++ b/block/bio.c@@ -859,6 +859,10 @@ 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) {
--
2.7.4