cvs commit: src/sys/kern vfs_syscalls.c

[John Baldwin]

jhb         2007-04-23 18:08:59 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_6)
    sys/kern             vfs_syscalls.c 
  Log:
  MFC: Don't go to a whole lot of extra work to handle the race where the
  new file descriptor is closed out from under us in kern_open().  This race
  is already handled and the file will be closed when kern_open() does an
  fdrop just before returning.
  
  In addition, by handling the race early, this opens the code up to an
  obscure bug where opening a devfs file could replace f_ops in the file
  object so that fdrop() will try to close the vnode, but f_vnode never gets
  set, so the vnode close routine panics due to the NULL f_vnode.
  
  Revision    Changes    Path
  1.392.2.18  +2 -25     src/sys/kern/vfs_syscalls.c