btrfs: do not BUG_ON() on failure to migrate space when replacing extents
At btrfs_replace_file_extents(), if we fail to migrate reserved metadata space from the transaction block reserve into the local block reserve, we trigger a BUG_ON(). This is because it should not be possible to have a failure here, as we reserved more space when we started the transaction than the space we want to migrate. However having a BUG_ON() is way too drastic, we can perfectly handle the failure and return the error to the caller. So just do that instead, and add a WARN_ON() to make it easier to notice the failure if it ever happens (which is particularly useful for fstests, and the warning will trigger a failure of a test case). Reviewed-by: NBoris Burkov <boris@bur.io> Signed-off-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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