From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out4-smtp.messagingengine.com ([66.111.4.28]:36795 "EHLO out4-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725897AbeLCRm3 (ORCPT ); Mon, 3 Dec 2018 12:42:29 -0500 Subject: FAILED: patch "[PATCH] mm: cleancache: fix corruption on missed inode invalidation" failed to apply to 4.4-stable tree To: ptikhomirov@virtuozzo.com, ak@linux.intel.com, akpm@linux-foundation.org, aryabinin@virtuozzo.com, hannes@cmpxchg.org, jack@suse.cz, mgorman@techsingularity.net, stable@vger.kernel.org, torvalds@linux-foundation.org, vvs@virtuozzo.com, willy@infradead.org Cc: From: Date: Mon, 03 Dec 2018 18:42:18 +0100 Message-ID: <154385893835119@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >>From 6ff38bd40230af35e446239396e5fc8ebd6a5248 Mon Sep 17 00:00:00 2001 From: Pavel Tikhomirov Date: Fri, 30 Nov 2018 14:09:00 -0800 Subject: [PATCH] mm: cleancache: fix corruption on missed inode invalidation If all pages are deleted from the mapping by memory reclaim and also moved to the cleancache: __delete_from_page_cache (no shadow case) unaccount_page_cache_page cleancache_put_page page_cache_delete mapping->nrpages -= nr (nrpages becomes 0) We don't clean the cleancache for an inode after final file truncation (removal). truncate_inode_pages_final check (nrpages || nrexceptional) is false no truncate_inode_pages no cleancache_invalidate_inode(mapping) These way when reading the new file created with same inode we may get these trash leftover pages from cleancache and see wrong data instead of the contents of the new file. Fix it by always doing truncate_inode_pages which is already ready for nrpages == 0 && nrexceptional == 0 case and just invalidates inode. [akpm@linux-foundation.org: add comment, per Jan] Link: http://lkml.kernel.org/r/20181112095734.17979-1-ptikhomirov@virtuozzo.com Fixes: commit 91b0abe36a7b ("mm + fs: store shadow entries in page cache") Signed-off-by: Pavel Tikhomirov Reviewed-by: Vasily Averin Reviewed-by: Andrey Ryabinin Reviewed-by: Jan Kara Cc: Johannes Weiner Cc: Mel Gorman Cc: Matthew Wilcox Cc: Andi Kleen Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds diff --git a/mm/truncate.c b/mm/truncate.c index 45d68e90b703..798e7ccfb030 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -517,9 +517,13 @@ void truncate_inode_pages_final(struct address_space *mapping) */ xa_lock_irq(&mapping->i_pages); xa_unlock_irq(&mapping->i_pages); - - truncate_inode_pages(mapping, 0); } + + /* + * Cleancache needs notification even if there are no pages or shadow + * entries. + */ + truncate_inode_pages(mapping, 0); } EXPORT_SYMBOL(truncate_inode_pages_final);