block: Fix bdi assignment to bdev inode when racing with disk delete
authorJan Kara <jack@suse.cz>
Thu, 23 Mar 2017 00:36:53 +0000 (01:36 +0100)
committerJens Axboe <axboe@fb.com>
Thu, 23 Mar 2017 02:11:22 +0000 (20:11 -0600)
commit03e262798884b0a5f948b17433afd80606cb3497
tree6f173a691e73dfdd8ba35c08269ff793277d2df8
parenta83b576c9c25cf771fb0b15ec5eb2e7510ec2f5a
block: Fix bdi assignment to bdev inode when racing with disk delete

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 <tj@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
fs/block_dev.c