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cvs commit: src/sys/kern src/sys/sys

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 1 Oct 2004 20:18:28 -0700 (PDT)

dillon      2004/10/01 20:18:28 PDT

DragonFly src repository

  Modified files:
    sys/kern             vfs_cache.c vfs_syscalls.c 
    sys/sys              namecache.h 
  VFS messaging/interfacing work stage 7b/99: More firming up of stage 7.
  (1) Enhance cache_resolve() to go up the directory chain as far as necessary
      to resolve the chain.  Previously I wimped out and returned an error.
  (2) Be sure not to use the parent of a mount point to obtain the vnode
      operations vector for a child of a mount point (which resides on a
      different filesystem!).
  Generally speaking the namecache directory chain should contain resolved
  vnodes due to the fact that the vnode associated with a namecache entry is
  held if any children exist, preventing the vnode from being recycled.
  However, the NFS client code as originally written wimps out and does
  wholesale namecache flushing of directories when it isn't sure about the
  state of things (which is quite often, especially when you are rm'ing
  files), and this breaks that assumption and causes some intermediate NFS
  directory nodes to revert back into an 'unresolved' state.  This will
  eventually be fixed, but not right now.
  Add a nc_mount pointer to the namecache structure.  For the moment this is
  only used to get at the mount point associated with a NCF_MOUNTPT namecache
  node (whether resolved or unresolved), making it easier for us to resolve
  the vnode.  But eventually it will be used as the basis for obtaining the
  v_ops for (new stlye) VOP calls on an unresolved namecache node, saving us
  a few indirections so I don't consider it a hack.
  Bugs-and-cores-by: drhodus
  Revision  Changes    Path
  1.31      +104 -4    src/sys/kern/vfs_cache.c
  1.41      +1 -0      src/sys/kern/vfs_syscalls.c
  1.11      +1 -0      src/sys/sys/namecache.h


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