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Mon, 14 Jun 2021 22:31:22 +0000 Date: Mon, 14 Jun 2021 15:31:20 -0700 From: Roman Gushchin To: Johannes Weiner CC: Andrew Morton , Tejun Heo , , , , Subject: Re: [PATCH 2/4] fs: drop_caches: fix skipping over shadow cache inodes Message-ID: References: <20210614211904.14420-1-hannes@cmpxchg.org> <20210614211904.14420-2-hannes@cmpxchg.org> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20210614211904.14420-2-hannes@cmpxchg.org> X-Originating-IP: [2620:10d:c090:400::5:bbd0] X-ClientProxiedBy: SJ0PR03CA0113.namprd03.prod.outlook.com (2603:10b6:a03:333::28) To BYAPR15MB4136.namprd15.prod.outlook.com (2603:10b6:a03:96::24) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from carbon.dhcp.thefacebook.com (2620:10d:c090:400::5:bbd0) by SJ0PR03CA0113.namprd03.prod.outlook.com (2603:10b6:a03:333::28) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4219.21 via Frontend Transport; Mon, 14 Jun 2021 22:31:22 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 30df90c5-1f6e-4bf2-36f5-08d92f842341 X-MS-TrafficTypeDiagnostic: BYAPR15MB2983: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-FB-Source: Internal X-MS-Oob-TLC-OOBClassifiers: OLM:8273; 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dkim=pass header.d=fb.com header.s=facebook header.b=TtmszXN2; spf=pass (imf07.hostedemail.com: domain of "prvs=579943755d=guro@fb.com" designates 67.231.145.42 as permitted sender) smtp.mailfrom="prvs=579943755d=guro@fb.com"; dmarc=pass (policy=reject) header.from=fb.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: EF109A000247 X-Stat-Signature: zh9qt1aoir7w1t48o6kynj9udfiku4cf X-HE-Tag: 1623709878-81706 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 > Signed-off-by: Johannes Weiner Acked-by: Roman Gushchin Thanks!