On Wed, Mar 16, 2016 at 05:21:56PM +0300, Kirill A. Shutemov wrote:

quoted

FYI, with a dummy ->migratepage() which returns only -EINVAL UBIFS does no
longer explode upon page migration.
Tomorrow I'll do more tests to make sure.

Could you check if something like this would fix the issue.
Completely untested.

We really need to make the default safe for file systems that don't
have a migratepage method.

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