Commit 78b572c9 authored by Pavel Tikhomirov's avatar Pavel Tikhomirov Committed by Greg Kroah-Hartman

mm: cleancache: fix corruption on missed inode invalidation

commit 6ff38bd40230af35e446239396e5fc8ebd6a5248 upstream.

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 91b0abe3 ("mm + fs: store shadow entries in page cache")
Signed-off-by: 's avatarPavel Tikhomirov <ptikhomirov@virtuozzo.com>
Reviewed-by: 's avatarVasily Averin <vvs@virtuozzo.com>
Reviewed-by: 's avatarAndrey Ryabinin <aryabinin@virtuozzo.com>
Reviewed-by: 's avatarJan Kara <jack@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: 's avatarVasily Averin <vvs@virtuozzo.com>
Signed-off-by: 's avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 4d0afb8b
......@@ -432,9 +432,13 @@ void truncate_inode_pages_final(struct address_space *mapping)
*/
spin_lock_irq(&mapping->tree_lock);
spin_unlock_irq(&mapping->tree_lock);
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);
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment