cvs commit: src/sys/fs/pseudofs pseudofs.c pseudofs.h pseudofs_fileno.c pseudofs_internal.h pseudofs_vncache.c

Dag-Erling Smorgrav des at
Wed Apr 11 22:40:57 UTC 2007

des         2007-04-11 22:40:57 UTC

  FreeBSD src repository

  Modified files:
    sys/fs/pseudofs      pseudofs.c pseudofs.h pseudofs_fileno.c 
                         pseudofs_internal.h pseudofs_vncache.c 
  Add a flag to struct pfs_vdata to mark the vnode as dead (e.g. process-
  specific nodes when the process exits)
  Move the vnode-cache-walking loop which was duplicated in pfs_exit() and
  pfs_disable() into its own function, pfs_purge(), which looks for vnodes
  marked as dead and / or belonging to the specified pfs_node and reclaims
  them.  Note that this loop is still extremely inefficient.
  Add a comment in pfs_vncache_alloc() explaining why we have to purge the
  vnode from the vnode cache before returning, in case anyone should be
  tempted to remove the call to cache_purge().
  Move the special handling for pfstype_root nodes into pfs_fileno_alloc()
  and pfs_fileno_free() (the root node's fileno must always be 2).  This
  also fixes a bug where pfs_fileno_free() would reclaim the root node's
  fileno, triggering a panic in the unr code, as that fileno was never
  allocated from unr to begin with.
  When destroying a pfs_node, release its fileno and purge it from the
  vnode cache.  I wish we could put off the call to pfs_purge() until
  after the entire tree had been destroyed, but then we'd have vnodes
  referencing freed pfs nodes.  This probably doesn't matter while we're
  still under Giant, but might become an issue later.
  When destroying a pseudofs instance, destroy the tree before tearing
  down the fileno allocator.
  In pfs_mount(), acquire the mountpoint interlock when required.
  MFC after:      3 weeks
  Revision  Changes    Path
  1.30      +11 -3     src/sys/fs/pseudofs/pseudofs.c
  1.34      +1 -0      src/sys/fs/pseudofs/pseudofs.h
  1.13      +12 -1     src/sys/fs/pseudofs/pseudofs_fileno.c
  1.5       +1 -0      src/sys/fs/pseudofs/pseudofs_internal.h
  1.35      +49 -47    src/sys/fs/pseudofs/pseudofs_vncache.c

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