From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760329AbXEIXmH (ORCPT ); Wed, 9 May 2007 19:42:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759831AbXEIXlS (ORCPT ); Wed, 9 May 2007 19:41:18 -0400 Received: from mga02.intel.com ([134.134.136.20]:1391 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759568AbXEIXlO (ORCPT ); Wed, 9 May 2007 19:41:14 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.14,512,1170662400"; d="scan'208";a="241424683" Date: Wed, 9 May 2007 16:38:15 -0700 From: Kristen Carlson Accardi To: jeff@garzik.org Cc: linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, htejun@gmail.com, Kristen Carlson Accardi Subject: [patch 2/7] genhd: expose AN to user space Message-Id: <20070509163815.be7d2b2d.kristen.c.accardi@intel.com> In-Reply-To: <20070510072247.063476979@intel.com> References: <20070510072247.063476979@intel.com> X-Mailer: Sylpheed version 2.2.10 (GTK+ 2.10.8; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Allow user space to determine if a disk supports Asynchronous Notification of media changes. This is done by adding a new sysfs file "capability_flags", which is documented in (insert file name). This sysfs file will export all disk capabilities flags to user space. We also define a new flag to define the media change notification capability. Signed-off-by: Kristen Carlson Accardi Index: 2.6-git/block/genhd.c =================================================================== --- 2.6-git.orig/block/genhd.c +++ 2.6-git/block/genhd.c @@ -370,7 +370,10 @@ static ssize_t disk_size_read(struct gen { return sprintf(page, "%llu\n", (unsigned long long)get_capacity(disk)); } - +static ssize_t disk_capability_read(struct gendisk *disk, char *page) +{ + return sprintf(page, "%x\n", disk->flags); +} static ssize_t disk_stats_read(struct gendisk * disk, char *page) { preempt_disable(); @@ -413,6 +416,10 @@ static struct disk_attribute disk_attr_s .attr = {.name = "size", .mode = S_IRUGO }, .show = disk_size_read }; +static struct disk_attribute disk_attr_capability = { + .attr = {.name = "capability", .mode = S_IRUGO }, + .show = disk_capability_read +}; static struct disk_attribute disk_attr_stat = { .attr = {.name = "stat", .mode = S_IRUGO }, .show = disk_stats_read @@ -453,6 +460,7 @@ static struct attribute * default_attrs[ &disk_attr_removable.attr, &disk_attr_size.attr, &disk_attr_stat.attr, + &disk_attr_capability.attr, #ifdef CONFIG_FAIL_MAKE_REQUEST &disk_attr_fail.attr, #endif Index: 2.6-git/include/linux/genhd.h =================================================================== --- 2.6-git.orig/include/linux/genhd.h +++ 2.6-git/include/linux/genhd.h @@ -94,6 +94,7 @@ struct hd_struct { #define GENHD_FL_REMOVABLE 1 #define GENHD_FL_DRIVERFS 2 +#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4 #define GENHD_FL_CD 8 #define GENHD_FL_UP 16 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32 Index: 2.6-git/Documentation/block/capability.txt =================================================================== --- /dev/null +++ 2.6-git/Documentation/block/capability.txt @@ -0,0 +1,15 @@ +Generic Block Device Capability +=============================================================================== +This file documents the sysfs file block//capability + +capability is a hex word indicating which capabilities a specific disk +supports. For more information on bits not listed here, see +include/linux/genhd.h + +Capability Value +------------------------------------------------------------------------------- +GENHD_FL_MEDIA_CHANGE_NOTIFY 4 + When this bit is set, the disk supports Asynchronous Notification + of media change events. These events will be broadcast to user + space via kernel uevent. + --