[Bug 235774] [FUSEFS]: Need to evict invalidated cache contents on fuse_write_directbackend()

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235774

--- Comment #5 from commit-hook at freebsd.org ---
A commit references this bug:

Author: asomers
Date: Fri Apr 12 19:05:08 UTC 2019
New revision: 346162
URL: https://svnweb.freebsd.org/changeset/base/346162

Log:
  fusefs: evict invalidated cache contents during write-through

  fusefs's default cache mode is "writethrough", although it currently works
  more like "write-around"; writes bypass the cache completely.  Since writes
  bypass the cache, they were leaving stale previously-read data in the cache.
  This commit invalidates that stale data.  It also adds a new global
  v_inval_buf_range method, like vtruncbuf but for a range of a file.

  PR:           235774
  Reported by:  cem
  Sponsored by: The FreeBSD Foundation

Changes:
  projects/fuse2/sys/fs/fuse/fuse_io.c
  projects/fuse2/sys/kern/vfs_subr.c
  projects/fuse2/sys/sys/vnode.h
  projects/fuse2/tests/sys/fs/fusefs/write.cc

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