From patchwork Fri Jan 18 21:32:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Wilck X-Patchwork-Id: 10771593 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 B31E06C2 for ; Fri, 18 Jan 2019 21:32:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A24903035A for ; Fri, 18 Jan 2019 21:32:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9632830731; Fri, 18 Jan 2019 21:32:49 +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 0D5923035A for ; Fri, 18 Jan 2019 21:32:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729654AbfARVcs (ORCPT ); Fri, 18 Jan 2019 16:32:48 -0500 Received: from smtp2.provo.novell.com ([137.65.250.81]:44215 "EHLO smtp2.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729474AbfARVcs (ORCPT ); Fri, 18 Jan 2019 16:32:48 -0500 Received: from apollon.suse.de.de (prv-ext-foundry1int.gns.novell.com [137.65.251.240]) by smtp2.provo.novell.com with ESMTP (TLS encrypted); Fri, 18 Jan 2019 14:32:36 -0700 From: Martin Wilck To: Jens Axboe , Tejun Heo , Hannes Reinecke Cc: Martin Wilck , linux-scsi@vger.kernel.org, linux-block@vger.kernel.org, linux-ide@vger.kernel.org, Christoph Hellwig , "Martin K. Petersen" , James Bottomley , Bart Van Assche Subject: [PATCH 1/4] block: disk_events: introduce event flags Date: Fri, 18 Jan 2019 22:32:04 +0100 Message-Id: <20190118213207.2309-2-mwilck@suse.com> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20190118213207.2309-1-mwilck@suse.com> References: <20190118213207.2309-1-mwilck@suse.com> MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@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 two flag bits that can be set to have the device treated like one that has 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. They can easily be fit in the int reserved for event bits. This patch doesn't change behavior. Signed-off-by: Martin Wilck --- block/genhd.c | 22 ++++++++++++++++------ drivers/scsi/sd.c | 3 ++- drivers/scsi/sr.c | 3 ++- include/linux/genhd.h | 7 +++++++ 4 files changed, 27 insertions(+), 8 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index 1dd8fd6..bcd16f6 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1631,7 +1631,8 @@ static unsigned long disk_events_poll_jiffies(struct gendisk *disk) */ if (ev->poll_msecs >= 0) intv_msecs = ev->poll_msecs; - else if (disk->events & ~disk->async_events) + else if (disk->events & DISK_EVENT_FLAG_POLL + && disk->events & ~disk->async_events) intv_msecs = disk_events_dfl_poll_msecs; return msecs_to_jiffies(intv_msecs); @@ -1841,11 +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->events & DISK_EVENT_FLAG_UEVENT) envp[nr_events++] = disk_uevents[i]; if (nr_events) @@ -1882,7 +1885,10 @@ static ssize_t disk_events_show(struct device *dev, { struct gendisk *disk = dev_to_disk(dev); - return __disk_events_show(disk->events, buf); + if (!(disk->events & DISK_EVENT_FLAG_UEVENT)) + return 0; + + return __disk_events_show(disk->events & DISK_EVENT_TYPES_MASK, buf); } static ssize_t disk_events_async_show(struct device *dev, @@ -1890,7 +1896,11 @@ static ssize_t disk_events_async_show(struct device *dev, { struct gendisk *disk = dev_to_disk(dev); - return __disk_events_show(disk->async_events, buf); + if (!(disk->events & DISK_EVENT_FLAG_UEVENT)) + return 0; + + return __disk_events_show(disk->async_events & DISK_EVENT_TYPES_MASK, + buf); } static ssize_t disk_events_poll_msecs_show(struct device *dev, diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index a1a44f5..fee8509 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3256,7 +3256,8 @@ static void sd_probe_async(void *data, async_cookie_t cookie) gd->flags = GENHD_FL_EXT_DEVT; if (sdp->removable) { gd->flags |= GENHD_FL_REMOVABLE; - gd->events |= DISK_EVENT_MEDIA_CHANGE; + gd->events |= DISK_EVENT_MEDIA_CHANGE | + 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 38ddbbf..3571651 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -716,7 +716,8 @@ static int sr_probe(struct device *dev) sprintf(disk->disk_name, "sr%d", minor); 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->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST + | 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 06c0fd59..1112bcc 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -148,8 +148,15 @@ struct hd_struct { enum { DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */ + /* Poll even if events_poll_msecs is unset */ + DISK_EVENT_FLAG_POLL = 1 << 16, + /* Forward events to udev */ + DISK_EVENT_FLAG_UEVENT = 1 << 17, }; +#define DISK_EVENT_TYPES_MASK \ + (DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST) + struct disk_part_tbl { struct rcu_head rcu_head; int len; From patchwork Fri Jan 18 21:32:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Wilck X-Patchwork-Id: 10771597 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 EE827139A for ; Fri, 18 Jan 2019 21:32:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DF27C3035A for ; Fri, 18 Jan 2019 21:32:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D2E19306B9; Fri, 18 Jan 2019 21:32:50 +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 6ECAF3035A for ; Fri, 18 Jan 2019 21:32:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729673AbfARVct (ORCPT ); Fri, 18 Jan 2019 16:32:49 -0500 Received: from smtp2.provo.novell.com ([137.65.250.81]:44482 "EHLO smtp2.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729474AbfARVct (ORCPT ); Fri, 18 Jan 2019 16:32:49 -0500 Received: from apollon.suse.de.de (prv-ext-foundry1int.gns.novell.com [137.65.251.240]) by smtp2.provo.novell.com with ESMTP (TLS encrypted); Fri, 18 Jan 2019 14:32:39 -0700 From: Martin Wilck To: Jens Axboe , Tejun Heo , Hannes Reinecke Cc: Martin Wilck , linux-scsi@vger.kernel.org, linux-block@vger.kernel.org, linux-ide@vger.kernel.org, Christoph Hellwig , "Martin K. Petersen" , James Bottomley , Bart Van Assche , Borislav Petkov Subject: [PATCH 2/4] Revert "ide: unexport DISK_EVENT_MEDIA_CHANGE for ide-gd and ide-cd" Date: Fri, 18 Jan 2019 22:32:05 +0100 Message-Id: <20190118213207.2309-3-mwilck@suse.com> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20190118213207.2309-1-mwilck@suse.com> References: <20190118213207.2309-1-mwilck@suse.com> MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@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 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..f9f4bac 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->events + * 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..cab8052 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->events. + * This is intended as removeable ide disk can't really detect + * MEDIA_CHANGE events. */ ret = drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED; drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED; @@ -417,6 +418,7 @@ static int ide_gd_probe(ide_drive_t *drive) g->flags = GENHD_FL_REMOVABLE; g->fops = &ide_gd_ops; device_add_disk(&drive->gendev, g, NULL); + g->events = DISK_EVENT_MEDIA_CHANGE; return 0; out_free_disk: From patchwork Fri Jan 18 21:32:06 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Wilck X-Patchwork-Id: 10771601 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 472B21880 for ; Fri, 18 Jan 2019 21:32:53 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 38EE7306E8 for ; Fri, 18 Jan 2019 21:32:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2CF1D302E3; Fri, 18 Jan 2019 21:32:53 +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 357EE306B9 for ; Fri, 18 Jan 2019 21:32:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729722AbfARVcu (ORCPT ); Fri, 18 Jan 2019 16:32:50 -0500 Received: from smtp2.provo.novell.com ([137.65.250.81]:60515 "EHLO smtp2.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729672AbfARVct (ORCPT ); Fri, 18 Jan 2019 16:32:49 -0500 Received: from apollon.suse.de.de (prv-ext-foundry1int.gns.novell.com [137.65.251.240]) by smtp2.provo.novell.com with ESMTP (TLS encrypted); Fri, 18 Jan 2019 14:32:42 -0700 From: Martin Wilck To: Jens Axboe , Tejun Heo , Hannes Reinecke Cc: Martin Wilck , linux-scsi@vger.kernel.org, linux-block@vger.kernel.org, linux-ide@vger.kernel.org, Christoph Hellwig , "Martin K. Petersen" , James Bottomley , Bart Van Assche , Jiri Kosina , Tim Waugh , Michal Simek Subject: [PATCH 3/4] Revert "block: unexport DISK_EVENT_MEDIA_CHANGE for legacy/fringe drivers" Date: Fri, 18 Jan 2019 22:32:06 +0100 Message-Id: <20190118213207.2309-4-mwilck@suse.com> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20190118213207.2309-1-mwilck@suse.com> References: <20190118213207.2309-1-mwilck@suse.com> MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@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 Signed-off-by: Martin Wilck Reviewed-by: Hannes Reinecke --- 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 6f2856c..f95699e 100644 --- a/drivers/block/floppy.c +++ b/drivers/block/floppy.c @@ -4543,6 +4543,7 @@ 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 96670ee..359a0d8 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 e92e7a8..52a74f9 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 Fri Jan 18 21:32:07 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Wilck X-Patchwork-Id: 10771607 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 0DE2A17FB for ; Fri, 18 Jan 2019 21:33:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F3E0D302E3 for ; Fri, 18 Jan 2019 21:33:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E77A5306B9; Fri, 18 Jan 2019 21:33:01 +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 8BEB5302E3 for ; Fri, 18 Jan 2019 21:33:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729725AbfARVdA (ORCPT ); Fri, 18 Jan 2019 16:33:00 -0500 Received: from smtp2.provo.novell.com ([137.65.250.81]:51676 "EHLO smtp2.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729672AbfARVc6 (ORCPT ); Fri, 18 Jan 2019 16:32:58 -0500 Received: from apollon.suse.de.de (prv-ext-foundry1int.gns.novell.com [137.65.251.240]) by smtp2.provo.novell.com with ESMTP (TLS encrypted); Fri, 18 Jan 2019 14:32:45 -0700 From: Martin Wilck To: Jens Axboe , Tejun Heo , Hannes Reinecke Cc: Martin Wilck , linux-scsi@vger.kernel.org, linux-block@vger.kernel.org, linux-ide@vger.kernel.org, Christoph Hellwig , "Martin K. Petersen" , James Bottomley , Bart Van Assche Subject: [PATCH 4/4] block: check_events: don't bother with events if unsupported Date: Fri, 18 Jan 2019 22:32:07 +0100 Message-Id: <20190118213207.2309-5-mwilck@suse.com> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20190118213207.2309-1-mwilck@suse.com> References: <20190118213207.2309-1-mwilck@suse.com> MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@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. Signed-off-by: Martin Wilck Reviewed-by: Hannes Reinecke --- block/genhd.c | 28 +++++++++++++++++----------- 1 file changed, 17 insertions(+), 11 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index bcd16f6..55b6570 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1909,6 +1909,9 @@ 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); } @@ -1925,6 +1928,9 @@ 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); @@ -1989,7 +1995,8 @@ static void disk_alloc_events(struct gendisk *disk) { struct disk_events *ev; - if (!disk->fops->check_events) + if (!disk->fops->check_events || + !(disk->events & DISK_EVENT_TYPES_MASK)) return; ev = kzalloc(sizeof(*ev), GFP_KERNEL); @@ -2011,14 +2018,14 @@ 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); @@ -2032,14 +2039,13 @@ 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); }