UBIFS orphans and ro-mounts

[Richard Weinberger <richard@sigma-star.at>]

Artem,

I wonder why UBIFS processes orphan inodes also when mounting read-only.
Depending on the workload before a power cut this can take a few seconds
and since we mount read-only the updated TNC will not written back to flash,
so upon next mount the time is again wasted.

This hurts boot performance a lot on systems where u-boot loads the kernel
from UBIFS.
u-boot always mounts UBIFS read-only.
So even when Linux mounts UBIFS rw and a powercut happens orphan processing
will happen twice.

I'd suggest calling ubifs_mount_orphans() only when we mount rw or remount to
rw.
What do you think?

Thanks,
//richard
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