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fs: drop_caches: fix skipping over shadow cache inodes 

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.

Link: https://lkml.kernel.org/r/20210614211904.14420-2-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reported-by: Roman Gushchin <guro@fb.com>
Acked-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2021-09-02 14:53:21 -07:00 committed by Linus Torvalds
parent 3047250972
commit 16e2df2a05
1 changed files with 2 additions and 1 deletions
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3
fs/drop_caches.c
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@ -3,6 +3,7 @@
* Implement the manual drop-all-pagecache function
*/
#include <linux/pagemap.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/fs.h>
@ -27,7 +28,7 @@ static void drop_pagecache_sb(struct super_block *sb, void *unused)
* we need to reschedule to avoid softlockups.
*/
if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
(inode->i_mapping->nrpages == 0 && !need_resched())) {
(mapping_empty(inode->i_mapping) && !need_resched())) {
spin_unlock(&inode->i_lock);
continue;
}