On Mon, Jun 14, 2021 at 05:19:02PM -0400, Johannes Weiner wrote:

When drop_caches truncates the page cache in an inode it also includes
any shadow entries for evicted pages. However, there is a preliminary
check on whether the inode has pages: if it has *only* shadow entries,
it will skip running truncation on the inode and leave it behind.

Fix the check to mapping_empty(), such that it runs truncation on any
inode that has cache entries at all.

Reported-by: Roman Gushchin <redacted>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>

Acked-by: Roman Gushchin <redacted>

Thanks!