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Fri, 6 Aug 2021 01:02:40 +0000 To: Shiyang Ruan , linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, nvdimm@lists.linux.dev, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, dm-devel@redhat.com References: <20210730100158.3117319-1-ruansy.fnst@fujitsu.com> <20210730100158.3117319-3-ruansy.fnst@fujitsu.com> From: Jane Chu Organization: Oracle Corporation Message-ID: Date: Thu, 5 Aug 2021 18:02:34 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 In-Reply-To: <20210730100158.3117319-3-ruansy.fnst@fujitsu.com> X-ClientProxiedBy: MN2PR19CA0011.namprd19.prod.outlook.com (2603:10b6:208:178::24) To SJ0PR10MB4429.namprd10.prod.outlook.com (2603:10b6:a03:2d1::14) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.1.70] (108.226.113.12) by MN2PR19CA0011.namprd19.prod.outlook.com (2603:10b6:208:178::24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4394.17 via Frontend Transport; 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Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-loop: dm-devel@redhat.com X-Mailman-Approved-At: Mon, 09 Aug 2021 02:53:04 -0400 Cc: snitzer@redhat.com, djwong@kernel.org, david@fromorbit.com, dan.j.williams@intel.com, hch@lst.de, agk@redhat.com Subject: Re: [dm-devel] [PATCH RESEND v6 2/9] dax: Introduce holder for dax_device X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" On 7/30/2021 3:01 AM, Shiyang Ruan wrote: > --- a/drivers/dax/super.c > +++ b/drivers/dax/super.c > @@ -214,6 +214,8 @@ enum dax_device_flags { > * @cdev: optional character interface for "device dax" > * @host: optional name for lookups where the device path is not available > * @private: dax driver private data > + * @holder_rwsem: prevent unregistration while holder_ops is in progress > + * @holder_data: holder of a dax_device: could be filesystem or mapped device > * @flags: state and boolean properties Perhaps add two documentary lines for @ops and @holder_ops? > */ > struct dax_device { > @@ -222,8 +224,11 @@ struct dax_device { > struct cdev cdev; > const char *host; > void *private; > + struct rw_semaphore holder_rwsem; > + void *holder_data; > unsigned long flags; > const struct dax_operations *ops; > + const struct dax_holder_operations *holder_ops; > }; thanks, -jane -- dm-devel mailing list dm-devel@redhat.com https://listman.redhat.com/mailman/listinfo/dm-devel