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Date:   Thu, 18 May 2017 15:16:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Jan Kara <jack@...e.cz>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Jens Axboe <axboe@...nel.dk>,
        Johannes Weiner <hannes@...xchg.org>,
        Alexey Kuznetsov <kuznet@...tuozzo.com>,
        Christoph Hellwig <hch@....de>,
        Nikolay Borisov <n.borisov.lkml@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 3.18 20/49] fs/block_dev: always invalidate cleancache in invalidate_bdev()

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andrey Ryabinin <aryabinin@...tuozzo.com>

commit a5f6a6a9c72eac38a7fadd1a038532bc8516337c upstream.

invalidate_bdev() calls cleancache_invalidate_inode() iff ->nrpages != 0
which doen't make any sense.

Make sure that invalidate_bdev() always calls cleancache_invalidate_inode()
regardless of mapping->nrpages value.

Fixes: c515e1fd361c ("mm/fs: add hooks to support cleancache")
Link: http://lkml.kernel.org/r/20170424164135.22350-3-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
Reviewed-by: Jan Kara <jack@...e.cz>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Alexey Kuznetsov <kuznet@...tuozzo.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Nikolay Borisov <n.borisov.lkml@...il.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/block_dev.c |   11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -86,12 +86,11 @@ void invalidate_bdev(struct block_device
 {
 	struct address_space *mapping = bdev->bd_inode->i_mapping;
 
-	if (mapping->nrpages == 0)
-		return;
-
-	invalidate_bh_lrus();
-	lru_add_drain_all();	/* make sure all lru add caches are flushed */
-	invalidate_mapping_pages(mapping, 0, -1);
+	if (mapping->nrpages) {
+		invalidate_bh_lrus();
+		lru_add_drain_all();	/* make sure all lru add caches are flushed */
+		invalidate_mapping_pages(mapping, 0, -1);
+	}
 	/* 99% of the time, we don't need to flush the cleancache on the bdev.
 	 * But, for the strange corners, lets be cautious
 	 */


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