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Message-ID: <20230922120227.1173720-10-dhowells@redhat.com>
Date: Fri, 22 Sep 2023 13:02:23 +0100
From: David Howells <dhowells@...hat.com>
To: Jens Axboe <axboe@...nel.dk>
Cc: David Howells <dhowells@...hat.com>,
Al Viro <viro@...iv.linux.org.uk>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Christoph Hellwig <hch@....de>,
Christian Brauner <christian@...uner.io>,
David Laight <David.Laight@...LAB.COM>,
Matthew Wilcox <willy@...radead.org>,
Jeff Layton <jlayton@...nel.org>,
linux-fsdevel@...r.kernel.org,
linux-block@...r.kernel.org,
linux-mm@...ck.org,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v6 09/13] iov_iter: Add a kernel-type iterator-only iteration function
Add an iteration function that can only iterate over kernel internal-type
iterators (ie. BVEC, KVEC, XARRAY) and not user-backed iterators (ie. UBUF
and IOVEC). This allows for smaller iterators to be built when it is known
the caller won't have a user-backed iterator.
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Alexander Viro <viro@...iv.linux.org.uk>
cc: Jens Axboe <axboe@...nel.dk>
cc: Christoph Hellwig <hch@....de>
cc: Christian Brauner <christian@...uner.io>
cc: Matthew Wilcox <willy@...radead.org>
cc: Linus Torvalds <torvalds@...ux-foundation.org>
cc: David Laight <David.Laight@...LAB.COM>
cc: linux-block@...r.kernel.org
cc: linux-fsdevel@...r.kernel.org
cc: linux-mm@...ck.org
---
Notes:
Changes
=======
ver #6)
- Document the priv2 arg of iterate_and_advance_kernel().
include/linux/iov_iter.h | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/include/linux/iov_iter.h b/include/linux/iov_iter.h
index 270454a6703d..d8733dc22b54 100644
--- a/include/linux/iov_iter.h
+++ b/include/linux/iov_iter.h
@@ -271,4 +271,36 @@ size_t iterate_and_advance(struct iov_iter *iter, size_t len, void *priv,
return iterate_and_advance2(iter, len, priv, NULL, ustep, step);
}
+/**
+ * iterate_and_advance_kernel - Iterate over a kernel iterator
+ * @iter: The iterator to iterate over.
+ * @len: The amount to iterate over.
+ * @priv: Data for the step functions.
+ * @priv2: More data for the step functions.
+ * @step: Processing function; given kernel addresses.
+ *
+ * Like iterate_and_advance2(), but rejected UBUF and IOVEC iterators and does
+ * not take a user-step function.
+ */
+static __always_inline
+size_t iterate_and_advance_kernel(struct iov_iter *iter, size_t len, void *priv,
+ void *priv2, iov_step_f step)
+{
+ if (unlikely(iter->count < len))
+ len = iter->count;
+ if (unlikely(!len))
+ return 0;
+
+ if (iov_iter_is_bvec(iter))
+ return iterate_bvec(iter, len, priv, priv2, step);
+ if (iov_iter_is_kvec(iter))
+ return iterate_kvec(iter, len, priv, priv2, step);
+ if (iov_iter_is_xarray(iter))
+ return iterate_xarray(iter, len, priv, priv2, step);
+ if (iov_iter_is_discard(iter))
+ return iterate_discard(iter, len, priv, priv2, step);
+ WARN_ON_ONCE(1);
+ return 0;
+}
+
#endif /* _LINUX_IOV_ITER_H */
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