linux-kernel - [RFC PATCH 31/79] fs/block: add struct address_space to __block_write_begin

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Date:   Wed,  4 Apr 2018 15:18:05 -0400
From:   jglisse@...hat.com
To:     linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Jérôme Glisse <jglisse@...hat.com>,
        Jens Axboe <axboe@...nel.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Tejun Heo <tj@...nel.org>, Jan Kara <jack@...e.cz>,
        Josef Bacik <jbacik@...com>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: [RFC PATCH 31/79] fs/block: add struct address_space to __block_write_begin_int() args

From: Jérôme Glisse <jglisse@...hat.com>

Add struct address_space to __block_write_begin_int() arguments.

One step toward dropping reliance on page->mapping.

----------------------------------------------------------------------
@exists@
identifier M;
expression E1, E2, E3, E4, E5;
@@
struct address_space *M;
...
-__block_write_begin_int(E1, E2, E3, E4, E5)
+__block_write_begin_int(M, E1, E2, E3, E4, E5)

@exists@
identifier M, F;
expression E1, E2, E3, E4, E5;
@@
F(..., struct address_space *M, ...) {...
-__block_write_begin_int(E1, E2, E3, E4, E5)
+__block_write_begin_int(M, E1, E2, E3, E4, E5)
...}
----------------------------------------------------------------------

Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
Cc: Jens Axboe <axboe@...nel.dk>
CC: Andrew Morton <akpm@...ux-foundation.org>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: linux-fsdevel@...r.kernel.org
Cc: Tejun Heo <tj@...nel.org>
Cc: Jan Kara <jack@...e.cz>
Cc: Josef Bacik <jbacik@...com>
Cc: Mel Gorman <mgorman@...hsingularity.net>
---
 fs/buffer.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index de16588d7f7f..c83878d0a4c0 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1943,8 +1943,9 @@ iomap_to_bh(struct inode *inode, sector_t block, struct buffer_head *bh,
 	}
 }
 
-int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
-		get_block_t *get_block, struct iomap *iomap)
+int __block_write_begin_int(struct address_space *mapping, struct page *page,
+		loff_t pos, unsigned len, get_block_t *get_block,
+		struct iomap *iomap)
 {
 	unsigned from = pos & (PAGE_SIZE - 1);
 	unsigned to = from + len;
@@ -2031,7 +2032,8 @@ int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
 int __block_write_begin(struct address_space *mapping, struct page *page,
 		loff_t pos, unsigned len, get_block_t *get_block)
 {
-	return __block_write_begin_int(page, pos, len, get_block, NULL);
+	return __block_write_begin_int(mapping, page, pos, len, get_block,
+				       NULL);
 }
 EXPORT_SYMBOL(__block_write_begin);
 
-- 
2.14.3