From patchwork Wed Mar 27 13:51:01 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Wilck X-Patchwork-Id: 10873511 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 54748139A for ; Wed, 27 Mar 2019 13:52:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 41D1D28C37 for ; Wed, 27 Mar 2019 13:52:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3F75728D8D; Wed, 27 Mar 2019 13:52:02 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CA98028C37 for ; Wed, 27 Mar 2019 13:52:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729533AbfC0NwA (ORCPT ); Wed, 27 Mar 2019 09:52:00 -0400 Received: from smtp2.provo.novell.com ([137.65.250.81]:38596 "EHLO smtp2.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725797AbfC0Nv7 (ORCPT ); Wed, 27 Mar 2019 09:51:59 -0400 Received: from apollon.suse.de.de (prva10-snat226-2.provo.novell.com [137.65.226.36]) by smtp2.provo.novell.com with ESMTP (TLS encrypted); Wed, 27 Mar 2019 07:51:46 -0600 From: Martin Wilck To: Jens Axboe , Tejun Heo , Hannes Reinecke , "Martin K. Petersen" , Christoph Hellwig Cc: James Bottomley , Bart Van Assche , Martin Wilck , linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org Subject: [PATCH v3 1/5] block: genhd: remove async_events field Date: Wed, 27 Mar 2019 14:51:01 +0100 Message-Id: <20190327135105.30893-2-mwilck@suse.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190327135105.30893-1-mwilck@suse.com> References: <20190327135105.30893-1-mwilck@suse.com> MIME-Version: 1.0 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The async_events field, intended to be used for drivers that support asynchronous notifications about disk events (aka media change events), isn't currently used by any driver, and apparently that has been that way for a long time (if not forever). Remove it. Reviewed-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Signed-off-by: Martin Wilck --- block/genhd.c | 10 ++++------ drivers/block/pktcdvd.c | 1 - include/linux/genhd.h | 1 - 3 files changed, 4 insertions(+), 8 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index 7032678..ee76de0 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1628,12 +1628,11 @@ static unsigned long disk_events_poll_jiffies(struct gendisk *disk) /* * If device-specific poll interval is set, always use it. If - * the default is being used, poll iff there are events which - * can't be monitored asynchronously. + * the default is being used, poll if the POLL flag is set. */ if (ev->poll_msecs >= 0) intv_msecs = ev->poll_msecs; - else if (disk->events & ~disk->async_events) + else if (disk->events) intv_msecs = disk_events_dfl_poll_msecs; return msecs_to_jiffies(intv_msecs); @@ -1860,6 +1859,7 @@ static void disk_check_events(struct disk_events *ev, * * events : list of all supported events * events_async : list of events which can be detected w/o polling + * (always empty, only for backwards compatibility) * events_poll_msecs : polling interval, 0: disable, -1: system default */ static ssize_t __disk_events_show(unsigned int events, char *buf) @@ -1890,9 +1890,7 @@ static ssize_t disk_events_show(struct device *dev, static ssize_t disk_events_async_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct gendisk *disk = dev_to_disk(dev); - - return __disk_events_show(disk->async_events, buf); + return 0; } static ssize_t disk_events_poll_msecs_show(struct device *dev, diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c index f5a7102..0240601 100644 --- a/drivers/block/pktcdvd.c +++ b/drivers/block/pktcdvd.c @@ -2761,7 +2761,6 @@ static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) /* inherit events of the host device */ disk->events = pd->bdev->bd_disk->events; - disk->async_events = pd->bdev->bd_disk->async_events; add_disk(disk); diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 06c0fd59..5f78edb 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -185,7 +185,6 @@ struct gendisk { char *(*devnode)(struct gendisk *gd, umode_t *mode); unsigned int events; /* supported events */ - unsigned int async_events; /* async events, subset of all */ /* Array of pointers to partitions indexed by partno. * Protected with matching bdev lock but stat and other From patchwork Wed Mar 27 13:51:02 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Wilck X-Patchwork-Id: 10873521 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4E48F1874 for ; Wed, 27 Mar 2019 13:52:07 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3ACFE28C34 for ; Wed, 27 Mar 2019 13:52:07 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 38F4228CFD; Wed, 27 Mar 2019 13:52:07 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A2D9F28BF5 for ; Wed, 27 Mar 2019 13:52:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730156AbfC0NwD (ORCPT ); Wed, 27 Mar 2019 09:52:03 -0400 Received: from smtp2.provo.novell.com ([137.65.250.81]:45637 "EHLO smtp2.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725797AbfC0NwA (ORCPT ); Wed, 27 Mar 2019 09:52:00 -0400 Received: from apollon.suse.de.de (prva10-snat226-2.provo.novell.com [137.65.226.36]) by smtp2.provo.novell.com with ESMTP (TLS encrypted); Wed, 27 Mar 2019 07:51:49 -0600 From: Martin Wilck To: Jens Axboe , Tejun Heo , Hannes Reinecke , "Martin K. Petersen" , Christoph Hellwig Cc: James Bottomley , Bart Van Assche , Martin Wilck , linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org Subject: [PATCH v3 2/5] block: disk_events: introduce event flags Date: Wed, 27 Mar 2019 14:51:02 +0100 Message-Id: <20190327135105.30893-3-mwilck@suse.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190327135105.30893-1-mwilck@suse.com> References: <20190327135105.30893-1-mwilck@suse.com> MIME-Version: 1.0 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Currently, an empty disk->events field tells the block layer not to forward media change events to user space. This was done in commit 7c88a168da80 ("block: don't propagate unlisted DISK_EVENTs to userland") in order to avoid events from "fringe" drivers to be forwarded to user space. By doing so, the block layer lost the information which events were supported by a particular block device, and most importantly, whether or not a given device supports media change events at all. Prepare for not interpreting the "events" field this way in the future any more. This is done by adding an additional field "event_flags" to struct gendisk, and two flag bits that can be set to have the device treated like one that had the "events" field set to a non-zero value before. This applies only to the sd and sr drivers, which are changed to set the new flags. The new flags are DISK_EVENT_FLAG_POLL to enforce polling of the device for synchronous events, and DISK_EVENT_FLAG_UEVENT to tell the blocklayer to generate udev events from kernel events. In order to add the event_flags field to struct gendisk, the events field is converted to an "unsigned short"; it doesn't need to hold values bigger than 2 anyway. This patch doesn't change behavior. Signed-off-by: Martin Wilck Reviewed-by: Christoph Hellwig --- block/genhd.c | 13 +++++++++---- drivers/scsi/sd.c | 1 + drivers/scsi/sr.c | 1 + include/linux/genhd.h | 10 +++++++++- 4 files changed, 20 insertions(+), 5 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index ee76de0..5375be3 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1632,7 +1632,7 @@ static unsigned long disk_events_poll_jiffies(struct gendisk *disk) */ if (ev->poll_msecs >= 0) intv_msecs = ev->poll_msecs; - else if (disk->events) + else if (disk->event_flags & DISK_EVENT_FLAG_POLL) intv_msecs = disk_events_dfl_poll_msecs; return msecs_to_jiffies(intv_msecs); @@ -1842,11 +1842,13 @@ static void disk_check_events(struct disk_events *ev, /* * Tell userland about new events. Only the events listed in - * @disk->events are reported. Unlisted events are processed the - * same internally but never get reported to userland. + * @disk->events are reported, and only if DISK_EVENT_FLAG_UEVENT + * is set. Otherwise, events are processed internally but never + * get reported to userland. */ for (i = 0; i < ARRAY_SIZE(disk_uevents); i++) - if (events & disk->events & (1 << i)) + if ((events & disk->events & (1 << i)) && + (disk->event_flags & DISK_EVENT_FLAG_UEVENT)) envp[nr_events++] = disk_uevents[i]; if (nr_events) @@ -1884,6 +1886,9 @@ static ssize_t disk_events_show(struct device *dev, { struct gendisk *disk = dev_to_disk(dev); + if (!(disk->event_flags & DISK_EVENT_FLAG_UEVENT)) + return 0; + return __disk_events_show(disk->events, buf); } diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 251db30..4742a22 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3327,6 +3327,7 @@ static void sd_probe_async(void *data, async_cookie_t cookie) if (sdp->removable) { gd->flags |= GENHD_FL_REMOVABLE; gd->events |= DISK_EVENT_MEDIA_CHANGE; + gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; } blk_pm_runtime_init(sdp->request_queue, dev); diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c index 039c27c2..c3f443d 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -716,6 +716,7 @@ static int sr_probe(struct device *dev) disk->fops = &sr_bdops; disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; + disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 5f78edb..081cb77 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -150,6 +150,13 @@ enum { DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */ }; +enum { + /* Poll even if events_poll_msecs is unset */ + DISK_EVENT_FLAG_POLL = 1 << 0, + /* Forward events to udev */ + DISK_EVENT_FLAG_UEVENT = 1 << 1, +}; + struct disk_part_tbl { struct rcu_head rcu_head; int len; @@ -184,7 +191,8 @@ struct gendisk { char disk_name[DISK_NAME_LEN]; /* name of major driver */ char *(*devnode)(struct gendisk *gd, umode_t *mode); - unsigned int events; /* supported events */ + unsigned short events; /* supported events */ + unsigned short event_flags; /* flags related to event processing */ /* Array of pointers to partitions indexed by partno. * Protected with matching bdev lock but stat and other From patchwork Wed Mar 27 13:51:03 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Wilck X-Patchwork-Id: 10873513 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A21CB139A for ; Wed, 27 Mar 2019 13:52:05 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8DABE28C1E for ; Wed, 27 Mar 2019 13:52:05 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8BFB228D6E; Wed, 27 Mar 2019 13:52:05 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C068928C1E for ; Wed, 27 Mar 2019 13:52:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730247AbfC0NwE (ORCPT ); Wed, 27 Mar 2019 09:52:04 -0400 Received: from smtp2.provo.novell.com ([137.65.250.81]:34559 "EHLO smtp2.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726233AbfC0NwB (ORCPT ); Wed, 27 Mar 2019 09:52:01 -0400 Received: from apollon.suse.de.de (prva10-snat226-2.provo.novell.com [137.65.226.36]) by smtp2.provo.novell.com with ESMTP (TLS encrypted); Wed, 27 Mar 2019 07:51:51 -0600 From: Martin Wilck To: Jens Axboe , Tejun Heo , Hannes Reinecke , "Martin K. Petersen" , Christoph Hellwig Cc: James Bottomley , Bart Van Assche , Martin Wilck , linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org, Borislav Petkov , Hannes Reinecke Subject: [PATCH v3 3/5] Revert "ide: unexport DISK_EVENT_MEDIA_CHANGE for ide-gd and ide-cd" Date: Wed, 27 Mar 2019 14:51:03 +0100 Message-Id: <20190327135105.30893-4-mwilck@suse.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190327135105.30893-1-mwilck@suse.com> References: <20190327135105.30893-1-mwilck@suse.com> MIME-Version: 1.0 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This reverts commit 7eec77a1816a7042591a6cbdb4820e9e7ebffe0e. Instead of leaving disk->events completely empty, we now export the supported events again, and tell the block layer not to forward events to user space by not setting DISK_EVENT_FLAG_UEVENT. This allows the block layer to distinguish between devices that for which events should be handled in kernel only, and devices which don't support any meda change events at all. Cc: Borislav Petkov Reviewed-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Signed-off-by: Martin Wilck --- drivers/ide/ide-cd.c | 1 + drivers/ide/ide-cd_ioctl.c | 5 +++-- drivers/ide/ide-gd.c | 6 ++++-- 3 files changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c index 1f03884..3b15adc 100644 --- a/drivers/ide/ide-cd.c +++ b/drivers/ide/ide-cd.c @@ -1797,6 +1797,7 @@ static int ide_cd_probe(ide_drive_t *drive) ide_cd_read_toc(drive); g->fops = &idecd_ops; g->flags |= GENHD_FL_REMOVABLE | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; + g->events = DISK_EVENT_MEDIA_CHANGE; device_add_disk(&drive->gendev, g, NULL); return 0; diff --git a/drivers/ide/ide-cd_ioctl.c b/drivers/ide/ide-cd_ioctl.c index 4a6e1a4..46f2df2 100644 --- a/drivers/ide/ide-cd_ioctl.c +++ b/drivers/ide/ide-cd_ioctl.c @@ -82,8 +82,9 @@ int ide_cdrom_drive_status(struct cdrom_device_info *cdi, int slot_nr) /* * ide-cd always generates media changed event if media is missing, which - * makes it impossible to use for proper event reporting, so disk->events - * is cleared to 0 and the following function is used only to trigger + * makes it impossible to use for proper event reporting, so + * DISK_EVENT_FLAG_UEVENT is cleared in disk->event_flags + * and the following function is used only to trigger * revalidation and never propagated to userland. */ unsigned int ide_cdrom_check_events_real(struct cdrom_device_info *cdi, diff --git a/drivers/ide/ide-gd.c b/drivers/ide/ide-gd.c index 04e008e..f233b34 100644 --- a/drivers/ide/ide-gd.c +++ b/drivers/ide/ide-gd.c @@ -299,8 +299,9 @@ static unsigned int ide_gd_check_events(struct gendisk *disk, /* * The following is used to force revalidation on the first open on * removeable devices, and never gets reported to userland as - * genhd->events is 0. This is intended as removeable ide disk - * can't really detect MEDIA_CHANGE events. + * DISK_EVENT_FLAG_UEVENT isn't set in genhd->event_flags. + * This is intended as removable ide disk can't really detect + * MEDIA_CHANGE events. */ ret = drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED; drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED; @@ -416,6 +417,7 @@ static int ide_gd_probe(ide_drive_t *drive) if (drive->dev_flags & IDE_DFLAG_REMOVABLE) g->flags = GENHD_FL_REMOVABLE; g->fops = &ide_gd_ops; + g->events = DISK_EVENT_MEDIA_CHANGE; device_add_disk(&drive->gendev, g, NULL); return 0; From patchwork Wed Mar 27 13:51:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Wilck X-Patchwork-Id: 10873515 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4614C1390 for ; Wed, 27 Mar 2019 13:52:06 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2FF7E28BE4 for ; Wed, 27 Mar 2019 13:52:06 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2DD0D28C1F; Wed, 27 Mar 2019 13:52:06 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 442AF28BE4 for ; Wed, 27 Mar 2019 13:52:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730210AbfC0NwE (ORCPT ); Wed, 27 Mar 2019 09:52:04 -0400 Received: from smtp2.provo.novell.com ([137.65.250.81]:44201 "EHLO smtp2.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729546AbfC0NwC (ORCPT ); Wed, 27 Mar 2019 09:52:02 -0400 Received: from apollon.suse.de.de (prva10-snat226-2.provo.novell.com [137.65.226.36]) by smtp2.provo.novell.com with ESMTP (TLS encrypted); Wed, 27 Mar 2019 07:51:54 -0600 From: Martin Wilck To: Jens Axboe , Tejun Heo , Hannes Reinecke , "Martin K. Petersen" , Christoph Hellwig Cc: James Bottomley , Bart Van Assche , Martin Wilck , linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org, Jiri Kosina , Tim Waugh , Michal Simek , Hannes Reinecke Subject: [PATCH v3 4/5] Revert "block: unexport DISK_EVENT_MEDIA_CHANGE for legacy/fringe drivers" Date: Wed, 27 Mar 2019 14:51:04 +0100 Message-Id: <20190327135105.30893-5-mwilck@suse.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190327135105.30893-1-mwilck@suse.com> References: <20190327135105.30893-1-mwilck@suse.com> MIME-Version: 1.0 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This reverts commit 9fd097b14918875bd6f125ed699d7bbbba5893ee. Instead of leaving disk->events completely empty, we now export the supported events again, and tell the block layer not to forward events to user space by not setting DISK_EVENT_FLAG_UEVENT. This allows the block layer to distinguish between devices that for which events should be handled in kernel only, and devices which don't support any meda change events at all. Cc: Jiri Kosina Cc: Tim Waugh Cc: Michal Simek Reviewed-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Signed-off-by: Martin Wilck --- drivers/block/amiflop.c | 1 + drivers/block/ataflop.c | 1 + drivers/block/floppy.c | 1 + drivers/block/paride/pcd.c | 1 + drivers/block/paride/pd.c | 1 + drivers/block/paride/pf.c | 1 + drivers/block/swim.c | 1 + drivers/block/swim3.c | 1 + drivers/block/xsysace.c | 1 + drivers/cdrom/gdrom.c | 1 + 10 files changed, 10 insertions(+) diff --git a/drivers/block/amiflop.c b/drivers/block/amiflop.c index 0903e08..92b930c 100644 --- a/drivers/block/amiflop.c +++ b/drivers/block/amiflop.c @@ -1829,6 +1829,7 @@ static int __init fd_probe_drives(void) disk->major = FLOPPY_MAJOR; disk->first_minor = drive; disk->fops = &floppy_fops; + disk->events = DISK_EVENT_MEDIA_CHANGE; sprintf(disk->disk_name, "fd%d", drive); disk->private_data = &unit[drive]; set_capacity(disk, 880*2); diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c index b0dbbdf..c7b5c46 100644 --- a/drivers/block/ataflop.c +++ b/drivers/block/ataflop.c @@ -2028,6 +2028,7 @@ static int __init atari_floppy_init (void) unit[i].disk->first_minor = i; sprintf(unit[i].disk->disk_name, "fd%d", i); unit[i].disk->fops = &floppy_fops; + unit[i].disk->events = DISK_EVENT_MEDIA_CHANGE; unit[i].disk->private_data = &unit[i]; set_capacity(unit[i].disk, MAX_DISK_SIZE * 2); add_disk(unit[i].disk); diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c index 95f608d..8072bd9 100644 --- a/drivers/block/floppy.c +++ b/drivers/block/floppy.c @@ -4540,6 +4540,7 @@ static int __init do_floppy_init(void) disks[drive]->major = FLOPPY_MAJOR; disks[drive]->first_minor = TOMINOR(drive); disks[drive]->fops = &floppy_fops; + disks[drive]->events = DISK_EVENT_MEDIA_CHANGE; sprintf(disks[drive]->disk_name, "fd%d", drive); timer_setup(&motor_off_timer[drive], motor_off_callback, 0); diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c index 377a694..5436d85 100644 --- a/drivers/block/paride/pcd.c +++ b/drivers/block/paride/pcd.c @@ -342,6 +342,7 @@ static void pcd_init_units(void) strcpy(disk->disk_name, cd->name); /* umm... */ disk->fops = &pcd_bdops; disk->flags = GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; + disk->events = DISK_EVENT_MEDIA_CHANGE; } } diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c index 0ff9b12..6f9ad3f 100644 --- a/drivers/block/paride/pd.c +++ b/drivers/block/paride/pd.c @@ -897,6 +897,7 @@ static void pd_probe_drive(struct pd_unit *disk) p->fops = &pd_fops; p->major = major; p->first_minor = (disk - pd) << PD_BITS; + p->events = DISK_EVENT_MEDIA_CHANGE; disk->gd = p; p->private_data = disk; diff --git a/drivers/block/paride/pf.c b/drivers/block/paride/pf.c index 103b617c..1aca4a8 100644 --- a/drivers/block/paride/pf.c +++ b/drivers/block/paride/pf.c @@ -319,6 +319,7 @@ static void __init pf_init_units(void) disk->first_minor = unit; strcpy(disk->disk_name, pf->name); disk->fops = &pf_fops; + disk->events = DISK_EVENT_MEDIA_CHANGE; if (!(*drives[unit])[D_PRT]) pf_drive_count++; } diff --git a/drivers/block/swim.c b/drivers/block/swim.c index 3fa6fcc..67b5ec2 100644 --- a/drivers/block/swim.c +++ b/drivers/block/swim.c @@ -862,6 +862,7 @@ static int swim_floppy_init(struct swim_priv *swd) swd->unit[drive].disk->first_minor = drive; sprintf(swd->unit[drive].disk->disk_name, "fd%d", drive); swd->unit[drive].disk->fops = &floppy_fops; + swd->unit[drive].disk->events = DISK_EVENT_MEDIA_CHANGE; swd->unit[drive].disk->private_data = &swd->unit[drive]; set_capacity(swd->unit[drive].disk, 2880); add_disk(swd->unit[drive].disk); diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c index 1e2ae90d..cf42729 100644 --- a/drivers/block/swim3.c +++ b/drivers/block/swim3.c @@ -1216,6 +1216,7 @@ static int swim3_attach(struct macio_dev *mdev, disk->first_minor = floppy_count; disk->fops = &floppy_fops; disk->private_data = fs; + disk->events = DISK_EVENT_MEDIA_CHANGE; disk->flags |= GENHD_FL_REMOVABLE; sprintf(disk->disk_name, "fd%d", floppy_count); set_capacity(disk, 2880); diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c index 87ccef4..8d29950 100644 --- a/drivers/block/xsysace.c +++ b/drivers/block/xsysace.c @@ -1032,6 +1032,7 @@ static int ace_setup(struct ace_device *ace) ace->gd->major = ace_major; ace->gd->first_minor = ace->id * ACE_NUM_MINORS; ace->gd->fops = &ace_fops; + ace->gd->events = DISK_EVENT_MEDIA_CHANGE; ace->gd->queue = ace->queue; ace->gd->private_data = ace; snprintf(ace->gd->disk_name, 32, "xs%c", ace->id + 'a'); diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c index f8b7345..5cf3bad 100644 --- a/drivers/cdrom/gdrom.c +++ b/drivers/cdrom/gdrom.c @@ -786,6 +786,7 @@ static int probe_gdrom(struct platform_device *devptr) goto probe_fail_cdrom_register; } gd.disk->fops = &gdrom_bdops; + gd.disk->events = DISK_EVENT_MEDIA_CHANGE; /* latch on to the interrupt */ err = gdrom_set_interrupt_handlers(); if (err) From patchwork Wed Mar 27 13:51:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Wilck X-Patchwork-Id: 10873527 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8B5511874 for ; Wed, 27 Mar 2019 13:52:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7B84828C18 for ; Wed, 27 Mar 2019 13:52:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 785E528C2A; Wed, 27 Mar 2019 13:52:11 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 223D428C18 for ; Wed, 27 Mar 2019 13:52:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730255AbfC0NwK (ORCPT ); Wed, 27 Mar 2019 09:52:10 -0400 Received: from smtp2.provo.novell.com ([137.65.250.81]:59107 "EHLO smtp2.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726233AbfC0NwK (ORCPT ); Wed, 27 Mar 2019 09:52:10 -0400 Received: from apollon.suse.de.de (prva10-snat226-2.provo.novell.com [137.65.226.36]) by smtp2.provo.novell.com with ESMTP (TLS encrypted); Wed, 27 Mar 2019 07:51:57 -0600 From: Martin Wilck To: Jens Axboe , Tejun Heo , Hannes Reinecke , "Martin K. Petersen" , Christoph Hellwig Cc: James Bottomley , Bart Van Assche , Martin Wilck , linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org, Hannes Reinecke Subject: [PATCH v3 5/5] block: check_events: don't bother with events if unsupported Date: Wed, 27 Mar 2019 14:51:05 +0100 Message-Id: <20190327135105.30893-6-mwilck@suse.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190327135105.30893-1-mwilck@suse.com> References: <20190327135105.30893-1-mwilck@suse.com> MIME-Version: 1.0 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Drivers now report to the block layer if they support media change events. If this is not the case, there's no need to allocate the event structure, and all event handling code can effectively be skipped. This simplifies code flow in particular for non-removable sd devices. This effectively reverts commit 75e3f3ee3c64 ("block: always allocate genhd->ev if check_events is implemented"). The sysfs files for the events are kept in place even if no events are supported, as user space may rely on them being present. The only difference is that an error code is now returned if the user tries to set poll_msecs. Reviewed-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Signed-off-by: Martin Wilck --- block/genhd.c | 27 ++++++++++++++++----------- 1 file changed, 16 insertions(+), 11 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index 5375be3..1d0d25f 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1904,6 +1904,9 @@ static ssize_t disk_events_poll_msecs_show(struct device *dev, { struct gendisk *disk = dev_to_disk(dev); + if (!disk->ev) + return sprintf(buf, "-1\n"); + return sprintf(buf, "%ld\n", disk->ev->poll_msecs); } @@ -1920,6 +1923,9 @@ static ssize_t disk_events_poll_msecs_store(struct device *dev, if (intv < 0 && intv != -1) return -EINVAL; + if (!disk->ev) + return -ENODEV; + disk_block_events(disk); disk->ev->poll_msecs = intv; __disk_unblock_events(disk, true); @@ -1984,7 +1990,7 @@ static void disk_alloc_events(struct gendisk *disk) { struct disk_events *ev; - if (!disk->fops->check_events) + if (!disk->fops->check_events || !disk->events) return; ev = kzalloc(sizeof(*ev), GFP_KERNEL); @@ -2006,14 +2012,14 @@ static void disk_alloc_events(struct gendisk *disk) static void disk_add_events(struct gendisk *disk) { - if (!disk->ev) - return; - /* FIXME: error handling */ if (sysfs_create_files(&disk_to_dev(disk)->kobj, disk_events_attrs) < 0) pr_warn("%s: failed to create sysfs files for events\n", disk->disk_name); + if (!disk->ev) + return; + mutex_lock(&disk_events_mutex); list_add_tail(&disk->ev->node, &disk_events); mutex_unlock(&disk_events_mutex); @@ -2027,14 +2033,13 @@ static void disk_add_events(struct gendisk *disk) static void disk_del_events(struct gendisk *disk) { - if (!disk->ev) - return; + if (disk->ev) { + disk_block_events(disk); - disk_block_events(disk); - - mutex_lock(&disk_events_mutex); - list_del_init(&disk->ev->node); - mutex_unlock(&disk_events_mutex); + mutex_lock(&disk_events_mutex); + list_del_init(&disk->ev->node); + mutex_unlock(&disk_events_mutex); + } sysfs_remove_files(&disk_to_dev(disk)->kobj, disk_events_attrs); }