Btrfs: When shrinking, only update disk size on success
Previously, we updated a device's size prior to attempting a shrink operation. This patch moves the device resizing logic to only happen if the shrink completes successfully. In the process, it introduces a new field to btrfs_device -- disk_total_bytes -- to track the on-disk size. Signed-off-by: NChris Ball <cjb@laptop.org> Signed-off-by: NChris Mason <chris.mason@oracle.com>
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