linux-kernel - [PATCH v4 08/31] iov_iter: let callers extract iovecs and bio

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1353537671-26284-9-git-send-email-dave.kleikamp@oracle.com>
Date:	Wed, 21 Nov 2012 16:40:48 -0600
From:	Dave Kleikamp <dave.kleikamp@...cle.com>
To:	linux-fsdevel@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Zach Brown <zab@...bo.net>,
	"Maxim V. Patlasov" <mpatlasov@...allels.com>,
	Dave Kleikamp <dave.kleikamp@...cle.com>
Subject: [PATCH v4 08/31] iov_iter: let callers extract iovecs and bio_vecs

From: Zach Brown <zab@...bo.net>

direct IO treats memory from user iovecs and memory from arrays of
kernel pages very differently.  User memory is pinned and worked with in
batches while kernel pages are always pinned and don't require
additional processing.

Rather than try and provide an abstraction that includes these
different behaviours we let direct IO extract the memory structs and
hand them to the existing code.

Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Cc: Zach Brown <zab@...bo.net>
---
 include/linux/fs.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 8b2f558..6f26f11 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -364,6 +364,17 @@ static inline void iov_iter_init_bvec(struct iov_iter *i,
 	iov_iter_advance(i, written);
 }
 
+static inline int iov_iter_has_bvec(struct iov_iter *i)
+{
+	return i->ops == &ii_bvec_ops;
+}
+
+static inline struct bio_vec *iov_iter_bvec(struct iov_iter *i)
+{
+	BUG_ON(!iov_iter_has_bvec(i));
+	return (struct bio_vec *)i->data;
+}
+
 extern struct iov_iter_ops ii_iovec_ops;
 
 static inline void iov_iter_init(struct iov_iter *i,
@@ -379,8 +390,14 @@ static inline void iov_iter_init(struct iov_iter *i,
 	iov_iter_advance(i, written);
 }
 
+static inline int iov_iter_has_iovec(struct iov_iter *i)
+{
+	return i->ops == &ii_iovec_ops;
+}
+
 static inline struct iovec *iov_iter_iovec(struct iov_iter *i)
 {
+	BUG_ON(!iov_iter_has_iovec(i));
 	return (struct iovec *)i->data;
 }
 
-- 
1.8.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/