linux-kernel - [PATCH v2 2/4] fs/block_dev: always invalidate cleancache in invalidate

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Message-ID: <20170424164135.22350-3-aryabinin@virtuozzo.com>
Date:   Mon, 24 Apr 2017 19:41:33 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Alexander Viro <viro@...iv.linux.org.uk>
CC:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        <stable@...r.kernel.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jan Kara <jack@...e.cz>, 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>,
        <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-mm@...ck.org>
Subject: [PATCH v2 2/4] fs/block_dev: always invalidate cleancache in invalidate_bdev()

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")
Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: <stable@...r.kernel.org>
---
 fs/block_dev.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 065d7c5..f625dce 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -104,12 +104,11 @@ void invalidate_bdev(struct block_device *bdev)
 {
 	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
 	 */
-- 
2.10.2