From 4db96b71e3caea5bb39053d57683129e0682c66f Mon Sep 17 00:00:00 2001
From: Akinobu Mita <akinobu.mita@gmail.com>
Date: Thu, 9 Oct 2014 15:26:55 -0700
Subject: vfs: guard end of device for mpage interface

Add guard_bio_eod() check for mpage code in order to allow us to do IO
even on the odd last sectors of a device, even if the block size is some
multiple of the physical sector size.

Using mpage_readpages() for block device requires this guard check.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 fs/internal.h | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'fs/internal.h')

diff --git a/fs/internal.h b/fs/internal.h
index e325b4f9c799..b2623200107b 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -34,6 +34,11 @@ static inline int __sync_blockdev(struct block_device *bdev, int wait)
 }
 #endif
 
+/*
+ * buffer.c
+ */
+extern void guard_bio_eod(int rw, struct bio *bio);
+
 /*
  * char_dev.c
  */
-- 
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