From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Jan Kara To: Jens Axboe Cc: linux-block@vger.kernel.org, Christoph Hellwig , Dan Williams , Thiago Jung Bauermann , Tejun Heo , Tahsin Erdogan , Omar Sandoval , Jan Kara Subject: [PATCH 01/10] block: Fix bdi assignment to bdev inode when racing with disk delete Date: Thu, 23 Mar 2017 01:36:53 +0100 Message-Id: <20170323003702.27571-2-jack@suse.cz> In-Reply-To: <20170323003702.27571-1-jack@suse.cz> References: <20170323003702.27571-1-jack@suse.cz> List-ID: When disk->fops->open() in __blkdev_get() returns -ERESTARTSYS, we restart the process of opening the block device. However we forget to switch bdev->bd_bdi back to noop_backing_dev_info and as a result bdev inode will be pointing to a stale bdi. Fix the problem by setting bdev->bd_bdi later when __blkdev_get() is already guaranteed to succeed. Acked-by: Tejun Heo Reviewed-by: Hannes Reinecke Signed-off-by: Jan Kara --- fs/block_dev.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/fs/block_dev.c b/fs/block_dev.c index 2eca00ec4370..53e2389ae4d4 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1556,8 +1556,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) bdev->bd_disk = disk; bdev->bd_queue = disk->queue; bdev->bd_contains = bdev; - if (bdev->bd_bdi == &noop_backing_dev_info) - bdev->bd_bdi = bdi_get(disk->queue->backing_dev_info); if (!partno) { ret = -ENXIO; @@ -1622,6 +1620,9 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) } bd_set_size(bdev, (loff_t)bdev->bd_part->nr_sects << 9); } + + if (bdev->bd_bdi == &noop_backing_dev_info) + bdev->bd_bdi = bdi_get(disk->queue->backing_dev_info); } else { if (bdev->bd_contains == bdev) { ret = 0; @@ -1653,8 +1654,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) bdev->bd_disk = NULL; bdev->bd_part = NULL; bdev->bd_queue = NULL; - bdi_put(bdev->bd_bdi); - bdev->bd_bdi = &noop_backing_dev_info; if (bdev != bdev->bd_contains) __blkdev_put(bdev->bd_contains, mode, 1); bdev->bd_contains = NULL; -- 2.10.2