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cvs commit: src/sys/kern src/sys/vfs/nfs

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 4 Oct 2004 02:20:43 -0700 (PDT)

dillon      2004/10/04 02:20:43 PDT

DragonFly src repository

  Modified files:
    sys/kern             init_main.c vfs_cache.c vfs_default.c 
    sys/vfs/nfs          nfs_vnops.c 
  VFS messaging/interfacing work stage 7c/99: More firming up of stage 7.
  Make a minor change to cache_alloc()'s semantics by having it returned a
  ref'd locked ncp.  Make the same change to cache_allocroot().
  Fix a bug in the resolver that could deadlock a namecache and vnode lock by
  unlocking the namecache node before locking the vnode.  This hack is only
  needed until the old API has been removed.
  Get rid of the old API compat code that tried to create dummy ncp's for
  directory vnodes that did not have one and then merge old and new, it got
  too messy.  The idea was to be able to cache things in the middle of the
  topology and then hook the topology up later when we knew the path.
  Instead, the old API simply does not enter things into the namecache
  if the parent directory vnode has not namecache structure associated
  with it.  This maintains the unbroken topology that we want to guarentee
  at the cost of the old API functions potentially not caching as much
  information.  [ since kern_open(), [f]chdir(), and [f]stat() execute the
  new API the loss of efficiency in the old API should not be noticeable ].
  When cache_enter() re-enters the same vnode, it was zaping the old namecache
  structure unnecessarily and causing problems with directories.  It no longer
  does this.
  NFS CHANGE: get rid of the va_ctime vs n_ctime test.  This test was supposed
  to detect server-side directory changes and purge the directory, but half the
  time it purged the directory anyway.  The new API requires that the directory
  topology remain intact so only purge if the directory is found not to exist.
  This change may have to be revisited later.
  NOTE: cache_nlookup() is sensitive to the directory topology when traversing
  ".." directories.  If a directory in the middle of the topology is purged
  it can cause the new API lookup to fail with EXDEV.
  Bug-reports-by: drhodus, various other people.
  Revision  Changes    Path
  1.39      +3 -1      src/sys/kern/init_main.c
  1.32      +183 -84   src/sys/kern/vfs_cache.c
  1.16      +23 -6     src/sys/kern/vfs_default.c
  1.32      +21 -3     src/sys/vfs/nfs/nfs_vnops.c


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