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Subject[RFC PATCH 32/79] fs/block: do not rely on page->mapping get it from the context
Date
From: Jérôme Glisse <jglisse@redhat.com>

This patch remove most dereference of page->mapping and get the mapping
from the call context (either already available in the function or by
adding it to function arguments).

Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
CC: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Cc: Tejun Heo <tj@kernel.org>
Cc: Jan Kara <jack@suse.cz>
Cc: Josef Bacik <jbacik@fb.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
---
fs/block_dev.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 502b6643bc74..dd9da97615e3 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -564,14 +564,14 @@ EXPORT_SYMBOL(thaw_bdev);
static int blkdev_writepage(struct address_space *mapping, struct page *page,
struct writeback_control *wbc)
{
- return block_write_full_page(page->mapping->host, page,
+ return block_write_full_page(mapping->host, page,
blkdev_get_block, wbc);
}

static int blkdev_readpage(struct file * file, struct address_space *mapping,
struct page * page)
{
- return block_read_full_page(page->mapping->host,page,blkdev_get_block);
+ return block_read_full_page(mapping->host,page,blkdev_get_block);
}

static int blkdev_readpages(struct file *file, struct address_space *mapping,
@@ -1941,7 +1941,7 @@ EXPORT_SYMBOL_GPL(blkdev_read_iter);
static int blkdev_releasepage(struct address_space *mapping,
struct page *page, gfp_t wait)
{
- struct super_block *super = BDEV_I(page->mapping->host)->bdev.bd_super;
+ struct super_block *super = BDEV_I(mapping->host)->bdev.bd_super;

if (super && super->s_op->bdev_try_to_free_page)
return super->s_op->bdev_try_to_free_page(super, page, wait);
--
2.14.3
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