On 9/24/21 9:09 AM, Chandan Babu R wrote:

From: Dave Chinner <redacted>

This is needed for the kernel buffer cache conversion to be able
to wait on IO synchrnously. It is implemented with pthread mutexes
and conditional variables.

Signed-off-by: Dave Chinner <redacted>

I am inclined to not merge patches 4 or 5 until there's something that
uses it. It can be merged and tested together with consumers, rather
than adding unused code at this point.  Thoughts?

-Eric