Description of problem:
If cached subvol changes (layout  changes), then a subsequent fd based fop does open (migration incheck or complete) on the new cached subvol.

The problem arises if a parallel fd based fop on same inode is done before this access. On such cases, the cached subvol on the inode is updated, and the older fd never sees this change and continues with the fops.

This does not cause failures anymore (afr has fixes now to handle anom fd's), but for completeness, we need to fix this behaviour.

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