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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Sun, 24 May 2009 12:39:38 +0000 (UTC)
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Subject: cvs commit: src/sys/kern kern_lockf.c src/sys/sys lockf.h
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kib         2009-05-24 12:39:38 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             kern_lockf.c 
    sys/sys              lockf.h 
  Log:
  SVN rev 192685 on 2009-05-24 12:39:38Z by kib
  
  The advisory lock may be activated or activated and removed during the
  sleep waiting for conditions when the lock may be granted.
  To prevent lf_setlock() from accessing possibly freed memory, add reference
  counting to the struct lockf_entry. Bump refcount around the sleep.
  
  Make lf_free_lock() return non-zero when structure was freed, and use
  this after the sleep to return EINTR to the caller. The error code might
  need a clarification, but we cannot return success to usermode, since
  the lock is not owned anymore.
  
  Reviewed by:    dfr
  Tested by:      pho
  MFC after:      1 month
  
  Revision  Changes    Path
  1.71      +15 -2     src/sys/kern/kern_lockf.c
  1.24      +1 -0      src/sys/sys/lockf.h