[PATCH] Btrfs: move btrfs_truncate_page to btrfs_cont_expand instead of btrfs_truncate V2

This has plagued us forever and I'm so over working around it. When we truncate down to a non-page aligned offset we will call btrfs_truncate_page to zero out the end of the page and write it back to disk, this will keep us from exposing stale data if we truncate back up from that point. The prob

[PATCH] Btrfs: move btrfs_truncate_page to btrfs_cont_expand instead of btrfs_truncate

This has plagued us forever and I'm so over working around it. When we truncate down to a non-page aligned offset we will call btrfs_truncate_page to zero out the end of the page and write it back to disk, this will keep us from exposing stale data if we truncate back up from that point. The prob