diff options
| author | Jan Kara <jack@suse.cz> | 2017-03-23 01:36:53 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-03-22 20:11:22 -0600 |
| commit | 03e262798884b0a5f948b17433afd80606cb3497 (patch) | |
| tree | 6f173a691e73dfdd8ba35c08269ff793277d2df8 /fs/block_dev.c | |
| parent | a83b576c9c25cf771fb0b15ec5eb2e7510ec2f5a (diff) | |
| download | lwn-03e262798884b0a5f948b17433afd80606cb3497.tar.gz lwn-03e262798884b0a5f948b17433afd80606cb3497.zip | |
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>
Diffstat (limited to 'fs/block_dev.c')
| -rw-r--r-- | fs/block_dev.c | 7 |
1 files 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; |