From patchwork Tue Mar 30 16:17:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12173093 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AB6B7C4345A for ; Tue, 30 Mar 2021 16:18:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 84313619D1 for ; Tue, 30 Mar 2021 16:18:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232330AbhC3QSP (ORCPT ); Tue, 30 Mar 2021 12:18:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40910 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231797AbhC3QSE (ORCPT ); Tue, 30 Mar 2021 12:18:04 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 09DCFC061574; Tue, 30 Mar 2021 09:18:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=06DvUoaPP4FnUhreDcYAOss1XhbqHxuJ6o8UzGwX1y8=; b=2NOUq5KWVdqnvqKrh8gqBNagiy Tb7ttzO8cOVqiWC9HEEudkBx4GCzmSt5+H6KlFY4F8OOgg2tl7Iyxc9namweH84oJVbh6LnoZLvDX ZHoI2uogyAIGjMj25Rq638TyWIe/Q7sLbO+FHjHO9ND4/xx78PJvkI8g2TM+oFr8E/Y+r26QgAQou T0wr12XWYjk1xmozBIdbm/opiokZTKHO0iyfd61U47zXVLJuD7VcXutlGu39GA2Keiq92RIk7mRio ECU7KBIyn1n36yE9VFsSiFefgXBnh5A52mG3M90UB3QzoWMHm+Nelqa9SW9wz+vCbGeQDmhSndyMk BDFKBS+Q==; Received: from [185.12.131.45] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1lRH42-008aLm-Vt; Tue, 30 Mar 2021 16:17:59 +0000 From: Christoph Hellwig To: Jens Axboe , Song Liu Cc: Konrad Rzeszutek Wilk , =?utf-8?q?Roger_Pau_Monn?= =?utf-8?q?=C3=A9?= , Minchan Kim , Nitin Gupta , Stefan Haberland , Jan Hoeppner , linux-block@vger.kernel.org, linux-raid@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org Subject: [PATCH 10/15] block: move bd_mutex to struct gendisk Date: Tue, 30 Mar 2021 18:17:22 +0200 Message-Id: <20210330161727.2297292-11-hch@lst.de> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210330161727.2297292-1-hch@lst.de> References: <20210330161727.2297292-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Replace the per-block device bd_mutex with a per-gendisk open_mutex, thus simplifying locking wherever we deal with partitions. Signed-off-by: Christoph Hellwig Acked-by: Roger Pau Monné Acked-by: Stefan Haberland --- Documentation/filesystems/locking.rst | 2 +- block/genhd.c | 3 ++- block/partitions/core.c | 22 +++++++--------- drivers/block/loop.c | 14 +++++----- drivers/block/xen-blkfront.c | 8 +++--- drivers/block/zram/zram_drv.c | 18 ++++++------- drivers/block/zram/zram_drv.h | 2 +- drivers/md/md.h | 6 ++--- drivers/s390/block/dasd_genhd.c | 8 +++--- drivers/scsi/sd.c | 4 +-- fs/block_dev.c | 37 +++++++++++---------------- fs/btrfs/volumes.c | 2 +- fs/super.c | 8 +++--- include/linux/blk_types.h | 1 - include/linux/genhd.h | 3 +++ 15 files changed, 65 insertions(+), 73 deletions(-) diff --git a/Documentation/filesystems/locking.rst b/Documentation/filesystems/locking.rst index 9774e92e449fbd..1cd8090fd4b262 100644 --- a/Documentation/filesystems/locking.rst +++ b/Documentation/filesystems/locking.rst @@ -475,7 +475,7 @@ prototypes:: locking rules: ======================= =================== -ops bd_mutex +ops open_mutex ======================= =================== open: yes release: yes diff --git a/block/genhd.c b/block/genhd.c index 8c8f543572e64e..7acedbd2474381 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1379,6 +1379,7 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) goto out_free_disk; disk->node_id = node_id; + mutex_init(&disk->open_mutex); xa_init(&disk->part_tbl); if (xa_insert(&disk->part_tbl, 0, disk->part0, GFP_KERNEL)) goto out_destroy_part_tbl; @@ -1596,7 +1597,7 @@ void disk_unblock_events(struct gendisk *disk) * doesn't clear the events from @disk->ev. * * CONTEXT: - * If @mask is non-zero must be called with bdev->bd_mutex held. + * If @mask is non-zero must be called with disk->open_mutex held. */ void disk_flush_events(struct gendisk *disk, unsigned int mask) { diff --git a/block/partitions/core.c b/block/partitions/core.c index 1a7558917c47d6..60388a41ff92a3 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -282,7 +282,7 @@ struct device_type part_type = { }; /* - * Must be called either with bd_mutex held, before a disk can be opened or + * Must be called either with open_mutex held, before a disk can be opened or * after all disk users are gone. */ void delete_partition(struct block_device *part) @@ -308,7 +308,7 @@ static ssize_t whole_disk_show(struct device *dev, static DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL); /* - * Must be called either with bd_mutex held, before a disk can be opened or + * Must be called either with open_mutex held, before a disk can be opened or * after all disk users are gone. */ static struct block_device *add_partition(struct gendisk *disk, int partno, @@ -440,15 +440,15 @@ int bdev_add_partition(struct block_device *bdev, int partno, { struct block_device *part; - mutex_lock(&bdev->bd_mutex); + mutex_lock(&bdev->bd_disk->open_mutex); if (partition_overlaps(bdev->bd_disk, start, length, -1)) { - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); return -EBUSY; } part = add_partition(bdev->bd_disk, partno, start, length, ADDPART_FLAG_NONE, NULL); - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); return PTR_ERR_OR_ZERO(part); } @@ -461,8 +461,7 @@ int bdev_del_partition(struct block_device *bdev, int partno) if (!part) return -ENXIO; - mutex_lock(&part->bd_mutex); - mutex_lock_nested(&bdev->bd_mutex, 1); + mutex_lock(&bdev->bd_disk->open_mutex); ret = -EBUSY; if (part->bd_openers) @@ -474,8 +473,7 @@ int bdev_del_partition(struct block_device *bdev, int partno) delete_partition(part); ret = 0; out_unlock: - mutex_unlock(&bdev->bd_mutex); - mutex_unlock(&part->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); bdput(part); return ret; } @@ -490,8 +488,7 @@ int bdev_resize_partition(struct block_device *bdev, int partno, if (!part) return -ENXIO; - mutex_lock(&part->bd_mutex); - mutex_lock_nested(&bdev->bd_mutex, 1); + mutex_lock(&bdev->bd_disk->open_mutex); ret = -EINVAL; if (start != part->bd_start_sect) goto out_unlock; @@ -504,8 +501,7 @@ int bdev_resize_partition(struct block_device *bdev, int partno, ret = 0; out_unlock: - mutex_unlock(&part->bd_mutex); - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); bdput(part); return ret; } diff --git a/drivers/block/loop.c b/drivers/block/loop.c index a370cde3ddd49a..f5eb70a90ed067 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -651,9 +651,9 @@ static void loop_reread_partitions(struct loop_device *lo, { int rc; - mutex_lock(&bdev->bd_mutex); + mutex_lock(&bdev->bd_disk->open_mutex); rc = bdev_disk_changed(bdev, false); - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); if (rc) pr_warn("%s: partition scan of loop%d (%s) failed (rc=%d)\n", __func__, lo->lo_number, lo->lo_file_name, rc); @@ -746,7 +746,7 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, mutex_unlock(&lo->lo_mutex); /* * We must drop file reference outside of lo_mutex as dropping - * the file ref can take bd_mutex which creates circular locking + * the file ref can take open_mutex which creates circular locking * dependency. */ fput(old_file); @@ -1259,7 +1259,7 @@ static int __loop_clr_fd(struct loop_device *lo, bool release) mutex_unlock(&lo->lo_mutex); if (partscan) { /* - * bd_mutex has been held already in release path, so don't + * open_mutex has been held already in release path, so don't * acquire it if this function is called in such case. * * If the reread partition isn't from release path, lo_refcnt @@ -1267,10 +1267,10 @@ static int __loop_clr_fd(struct loop_device *lo, bool release) * current holder is released. */ if (!release) - mutex_lock(&bdev->bd_mutex); + mutex_lock(&bdev->bd_disk->open_mutex); err = bdev_disk_changed(bdev, false); if (!release) - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); if (err) pr_warn("%s: partition scan of loop%d failed (rc=%d)\n", __func__, lo_number, err); @@ -1297,7 +1297,7 @@ static int __loop_clr_fd(struct loop_device *lo, bool release) /* * Need not hold lo_mutex to fput backing file. Calling fput holding * lo_mutex triggers a circular lock dependency possibility warning as - * fput can take bd_mutex which is usually taken before lo_mutex. + * fput can take open_mutex which is usually taken before lo_mutex. */ if (filp) fput(filp); diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index e1c6798889f48a..fbab2ce7dfa1a5 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -2163,7 +2163,7 @@ static void blkfront_closing(struct blkfront_info *info) return; } - mutex_lock(&bdev->bd_mutex); + mutex_lock(&bdev->bd_disk->open_mutex); if (bdev->bd_openers) { xenbus_dev_error(xbdev, -EBUSY, @@ -2174,7 +2174,7 @@ static void blkfront_closing(struct blkfront_info *info) xenbus_frontend_closed(xbdev); } - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); bdput(bdev); } @@ -2531,7 +2531,7 @@ static int blkfront_remove(struct xenbus_device *xbdev) * isn't closed yet, we let release take care of it. */ - mutex_lock(&bdev->bd_mutex); + mutex_lock(&disk->open_mutex); info = disk->private_data; dev_warn(disk_to_dev(disk), @@ -2546,7 +2546,7 @@ static int blkfront_remove(struct xenbus_device *xbdev) mutex_unlock(&blkfront_mutex); } - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&disk->open_mutex); bdput(bdev); return 0; diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index cf8deecc39efbc..b3bf544493d340 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1781,24 +1781,24 @@ static ssize_t reset_store(struct device *dev, zram = dev_to_zram(dev); bdev = zram->disk->part0; - mutex_lock(&bdev->bd_mutex); + mutex_lock(&bdev->bd_disk->open_mutex); /* Do not reset an active device or claimed device */ if (bdev->bd_openers || zram->claim) { - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); return -EBUSY; } /* From now on, anyone can't open /dev/zram[0-9] */ zram->claim = true; - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); /* Make sure all the pending I/O are finished */ fsync_bdev(bdev); zram_reset_device(zram); - mutex_lock(&bdev->bd_mutex); + mutex_lock(&bdev->bd_disk->open_mutex); zram->claim = false; - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); return len; } @@ -1808,7 +1808,7 @@ static int zram_open(struct block_device *bdev, fmode_t mode) int ret = 0; struct zram *zram; - WARN_ON(!mutex_is_locked(&bdev->bd_mutex)); + WARN_ON(!mutex_is_locked(&bdev->bd_disk->open_mutex)); zram = bdev->bd_disk->private_data; /* zram was claimed to reset so open request fails */ @@ -1982,14 +1982,14 @@ static int zram_remove(struct zram *zram) { struct block_device *bdev = zram->disk->part0; - mutex_lock(&bdev->bd_mutex); + mutex_lock(&bdev->bd_disk->open_mutex); if (bdev->bd_openers || zram->claim) { - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); return -EBUSY; } zram->claim = true; - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); zram_debugfs_unregister(zram); diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h index 419a7e8281ee3a..74c411911b6eac 100644 --- a/drivers/block/zram/zram_drv.h +++ b/drivers/block/zram/zram_drv.h @@ -112,7 +112,7 @@ struct zram { /* * zram is claimed so open request will be failed */ - bool claim; /* Protected by bdev->bd_mutex */ + bool claim; /* Protected by disk->open_mutex */ struct file *backing_dev; #ifdef CONFIG_ZRAM_WRITEBACK spinlock_t wb_limit_lock; diff --git a/drivers/md/md.h b/drivers/md/md.h index fb7eab58cfd517..a88086d4110c24 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -395,10 +395,10 @@ struct mddev { * that we are never stopping an array while it is open. * 'reconfig_mutex' protects all other reconfiguration. * These locks are separate due to conflicting interactions - * with bdev->bd_mutex. + * with disk->open_mutex. * Lock ordering is: - * reconfig_mutex -> bd_mutex - * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open + * reconfig_mutex -> disk->open_mutex + * disk->open_mutex -> open_mutex: e.g. __blkdev_get -> md_open */ struct mutex open_mutex; struct mutex reconfig_mutex; diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c index a9698fba9b76ce..c93a46a38085bb 100644 --- a/drivers/s390/block/dasd_genhd.c +++ b/drivers/s390/block/dasd_genhd.c @@ -109,9 +109,9 @@ int dasd_scan_partitions(struct dasd_block *block) return -ENODEV; } - mutex_lock(&bdev->bd_mutex); + mutex_lock(&block->gdp->open_mutex); rc = bdev_disk_changed(bdev, false); - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&block->gdp->open_mutex); if (rc) DBF_DEV_EVENT(DBF_ERR, block->base, "scan partitions error, rc %d", rc); @@ -145,9 +145,9 @@ void dasd_destroy_partitions(struct dasd_block *block) bdev = block->bdev; block->bdev = NULL; - mutex_lock(&bdev->bd_mutex); + mutex_lock(&bdev->bd_disk->open_mutex); blk_drop_partitions(bdev); - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); /* Matching blkdev_put to the blkdev_get in dasd_scan_partitions. */ blkdev_put(bdev, FMODE_READ); diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index ed0b1bb99f0832..dc79d2e0e9dba9 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1400,7 +1400,7 @@ static void sd_uninit_command(struct scsi_cmnd *SCpnt) * In the latter case @inode and @filp carry an abridged amount * of information as noted above. * - * Locking: called with bdev->bd_mutex held. + * Locking: called with bdev->bd_disk->open_mutex held. **/ static int sd_open(struct block_device *bdev, fmode_t mode) { @@ -1476,7 +1476,7 @@ static int sd_open(struct block_device *bdev, fmode_t mode) * Note: may block (uninterruptible) if error recovery is underway * on this disk. * - * Locking: called with bdev->bd_mutex held. + * Locking: called with bdev->bd_disk->open_mutex held. **/ static void sd_release(struct gendisk *disk, fmode_t mode) { diff --git a/fs/block_dev.c b/fs/block_dev.c index 691eef20a7ced7..4113a27ad9e72d 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -891,7 +891,6 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno) mapping_set_gfp_mask(&inode->i_data, GFP_USER); bdev = I_BDEV(inode); - mutex_init(&bdev->bd_mutex); mutex_init(&bdev->bd_fsfreeze_mutex); spin_lock_init(&bdev->bd_size_lock); bdev->bd_disk = disk; @@ -1150,7 +1149,7 @@ int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) struct bd_holder_disk *holder; int ret = 0; - mutex_lock(&bdev->bd_mutex); + mutex_lock(&bdev->bd_disk->open_mutex); WARN_ON_ONCE(!bdev->bd_holder); @@ -1195,7 +1194,7 @@ int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) out_free: kfree(holder); out_unlock: - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); return ret; } EXPORT_SYMBOL_GPL(bd_link_disk_holder); @@ -1214,7 +1213,7 @@ void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk) { struct bd_holder_disk *holder; - mutex_lock(&bdev->bd_mutex); + mutex_lock(&bdev->bd_disk->open_mutex); holder = bd_find_holder_disk(bdev, disk); @@ -1226,7 +1225,7 @@ void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk) kfree(holder); } - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); } EXPORT_SYMBOL_GPL(bd_unlink_disk_holder); #endif @@ -1238,7 +1237,7 @@ int bdev_disk_changed(struct block_device *bdev, bool invalidate) struct gendisk *disk = bdev->bd_disk; int ret; - lockdep_assert_held(&bdev->bd_mutex); + lockdep_assert_held(&disk->open_mutex); clear_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state); @@ -1318,14 +1317,10 @@ static int blkdev_get_part(struct block_device *part, fmode_t mode) goto done; whole = bdgrab(disk->part0); - mutex_lock_nested(&whole->bd_mutex, 1); ret = blkdev_get_whole(whole, mode); - if (ret) { - mutex_unlock(&whole->bd_mutex); + if (ret) goto out_put_whole; - } whole->bd_part_count++; - mutex_unlock(&whole->bd_mutex); ret = -ENXIO; if (!(disk->flags & GENHD_FL_UP) || !bdev_nr_sectors(part)) @@ -1435,7 +1430,7 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) disk_block_events(disk); - mutex_lock(&bdev->bd_mutex); + mutex_lock(&disk->open_mutex); if (bdev_is_partition(bdev)) ret = blkdev_get_part(bdev, mode); else @@ -1458,7 +1453,7 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) unblock_events = false; } } - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&disk->open_mutex); if (unblock_events) disk_unblock_events(disk); @@ -1467,7 +1462,7 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder) abort_claiming: if (mode & FMODE_EXCL) bd_abort_claiming(bdev, holder); - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&disk->open_mutex); disk_unblock_events(disk); put_blkdev: blkdev_put_no_open(bdev); @@ -1547,7 +1542,6 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) struct gendisk *disk = bdev->bd_disk; struct block_device *victim = NULL; - mutex_lock_nested(&bdev->bd_mutex, for_part); if (for_part) bdev->bd_part_count--; @@ -1562,7 +1556,6 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) if (!bdev_is_partition(bdev) && disk->fops->release) disk->fops->release(disk, mode); - mutex_unlock(&bdev->bd_mutex); if (victim) { __blkdev_put(victim, mode, 1); bdput(victim); @@ -1583,15 +1576,14 @@ void blkdev_put(struct block_device *bdev, fmode_t mode) if (bdev->bd_openers == 1) sync_blockdev(bdev); - mutex_lock(&bdev->bd_mutex); - + mutex_lock(&disk->open_mutex); if (mode & FMODE_EXCL) { struct block_device *whole = bdev_whole(bdev); bool bdev_free; /* * Release a claim on the device. The holder fields - * are protected with bdev_lock. bd_mutex is to + * are protected with bdev_lock. open_mutex is to * synchronize disk_holder unlinking. */ spin_lock(&bdev_lock); @@ -1622,9 +1614,10 @@ void blkdev_put(struct block_device *bdev, fmode_t mode) * from userland - e.g. eject(1). */ disk_flush_events(disk, DISK_EVENT_MEDIA_CHANGE); - mutex_unlock(&bdev->bd_mutex); __blkdev_put(bdev, mode, 0); + mutex_unlock(&disk->open_mutex); + blkdev_put_no_open(bdev); } EXPORT_SYMBOL(blkdev_put); @@ -1917,10 +1910,10 @@ void iterate_bdevs(void (*func)(struct block_device *, void *), void *arg) old_inode = inode; bdev = I_BDEV(inode); - mutex_lock(&bdev->bd_mutex); + mutex_lock(&bdev->bd_disk->open_mutex); if (bdev->bd_openers) func(bdev, arg); - mutex_unlock(&bdev->bd_mutex); + mutex_unlock(&bdev->bd_disk->open_mutex); spin_lock(&blockdev_superblock->s_inode_list_lock); } diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index bc3b33efddc569..30fb9084ac145b 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1246,7 +1246,7 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, lockdep_assert_held(&uuid_mutex); /* * The device_list_mutex cannot be taken here in case opening the - * underlying device takes further locks like bd_mutex. + * underlying device takes further locks like open_mutex. * * We also don't need the lock here as this is called during mount and * exclusion is provided by uuid_mutex diff --git a/fs/super.c b/fs/super.c index 8c1baca35c160b..90b68352a26e14 100644 --- a/fs/super.c +++ b/fs/super.c @@ -1276,9 +1276,9 @@ int get_tree_bdev(struct fs_context *fc, } /* - * s_umount nests inside bd_mutex during + * s_umount nests inside open_mutex during * __invalidate_device(). blkdev_put() acquires - * bd_mutex and can't be called under s_umount. Drop + * open_mutex and can't be called under s_umount. Drop * s_umount temporarily. This is safe as we're * holding an active reference. */ @@ -1351,9 +1351,9 @@ struct dentry *mount_bdev(struct file_system_type *fs_type, } /* - * s_umount nests inside bd_mutex during + * s_umount nests inside open_mutex during * __invalidate_device(). blkdev_put() acquires - * bd_mutex and can't be called under s_umount. Drop + * open_mutex and can't be called under s_umount. Drop * s_umount temporarily. This is safe as we're * holding an active reference. */ diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index db026b6ec15ab7..a09660671fa47e 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -29,7 +29,6 @@ struct block_device { int bd_openers; struct inode * bd_inode; /* will die */ struct super_block * bd_super; - struct mutex bd_mutex; /* open/close mutex */ void * bd_claiming; struct device bd_device; void * bd_holder; diff --git a/include/linux/genhd.h b/include/linux/genhd.h index f364619092cca0..02ea04144ece7b 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -153,6 +153,9 @@ struct gendisk { unsigned long state; #define GD_NEED_PART_SCAN 0 #define GD_READ_ONLY 1 + + struct mutex open_mutex; /* open/close mutex */ + struct kobject *slave_dir; struct timer_rand_state *random;