linux-kernel - [PATCH v5 2/8] block: move two bvec structure into bvec.h

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Message-Id: <1460928615-20894-3-git-send-email-ming.lei@canonical.com>
Date:	Mon, 18 Apr 2016 05:29:51 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org
Cc:	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Ming Lei <ming.lei@...onical.com>, Jan Kara <jack@...e.cz>,
	Keith Busch <keith.busch@...el.com>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Tejun Heo <tj@...nel.org>, Mike Snitzer <snitzer@...hat.com>,
	Shaohua Li <shli@...com>
Subject: [PATCH v5 2/8] block: move two bvec structure into bvec.h

This patch moves 'struct bio_vec' and 'struct bvec_iter'
into 'include/linux/bvec.h', then always include this header
into 'include/linux/blk_types.h'.

With this change, both 'struct bvec_iter' and bvec iterator
helpers don't depend on CONFIG_BLOCK any more, then we can
use bvec iterator to implement iterate_bvec(): lib/iov_iter.c.

Suggested-by: Christoph Hellwig <hch@...radead.org>
Signed-off-by: Ming Lei <ming.lei@...onical.com>
---
 include/linux/bio.h       |  1 -
 include/linux/blk_types.h | 22 +---------------------
 include/linux/bvec.h      | 23 ++++++++++++++++++++++-
 3 files changed, 23 insertions(+), 23 deletions(-)

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 1c06184..96835a0 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -31,7 +31,6 @@
 
 /* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */
 #include <linux/blk_types.h>
-#include <linux/bvec.h>
 
 #define BIO_DEBUG
 
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 86a38ea..a8d8e1f 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -6,6 +6,7 @@
 #define __LINUX_BLK_TYPES_H
 
 #include <linux/types.h>
+#include <linux/bvec.h>
 
 struct bio_set;
 struct bio;
@@ -17,28 +18,7 @@ struct cgroup_subsys_state;
 typedef void (bio_end_io_t) (struct bio *);
 typedef void (bio_destructor_t) (struct bio *);
 
-/*
- * was unsigned short, but we might as well be ready for > 64kB I/O pages
- */
-struct bio_vec {
-	struct page	*bv_page;
-	unsigned int	bv_len;
-	unsigned int	bv_offset;
-};
-
 #ifdef CONFIG_BLOCK
-
-struct bvec_iter {
-	sector_t		bi_sector;	/* device address in 512 byte
-						   sectors */
-	unsigned int		bi_size;	/* residual I/O count */
-
-	unsigned int		bi_idx;		/* current index into bvl_vec */
-
-	unsigned int            bi_bvec_done;	/* number of bytes completed in
-						   current bvec */
-};
-
 /*
  * main unit of I/O for the block layer and lower layers (ie drivers and
  * stacking drivers)
diff --git a/include/linux/bvec.h b/include/linux/bvec.h
index 29c459d..096efd2 100644
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -20,7 +20,28 @@
 #ifndef __LINUX_BVEC_ITER_H
 #define __LINUX_BVEC_ITER_H
 
-#include <linux/blk_types.h>
+#include <linux/kernel.h>
+#include <linux/bug.h>
+
+/*
+ * was unsigned short, but we might as well be ready for > 64kB I/O pages
+ */
+struct bio_vec {
+	struct page	*bv_page;
+	unsigned int	bv_len;
+	unsigned int	bv_offset;
+};
+
+struct bvec_iter {
+	sector_t		bi_sector;	/* device address in 512 byte
+						   sectors */
+	unsigned int		bi_size;	/* residual I/O count */
+
+	unsigned int		bi_idx;		/* current index into bvl_vec */
+
+	unsigned int            bi_bvec_done;	/* number of bytes completed in
+						   current bvec */
+};
 
 /*
  * various member access, note that bio_data should of course not be used
-- 
1.9.1