VFS fixes for 5.10-rc4:

- Finally remove the "convert to trylock" weirdness in the fs freezer
  code.  It was necessary 10 years ago to deal with nested transactions
  in XFS, but we've long since removed that; and now this is causing
  subtle race conditions when lockdep goes offline and sb_start_* aren't
  prepared to retry a trylock failure.
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