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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Sat, 3 Jan 2009 13:24:08 +0000 (UTC)
To: cvs-src-old@freebsd.org
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Subject: cvs commit: src/sys/kern uipc_cow.c src/sys/vm vm_page.c vm_page.h
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kib         2009-01-03 13:24:08 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             uipc_cow.c 
    sys/vm               vm_page.c vm_page.h 
  Log:
  SVN rev 186719 on 2009-01-03 13:24:08Z by kib
  
  Extend the struct vm_page wire_count to u_int to avoid the overflow
  of the counter, that may happen when too many sendfile(2) calls are
  being executed with this vnode [1].
  
  To keep the size of the struct vm_page and offsets of the fields
  accessed by out-of-tree modules, swap the types and locations
  of the wire_count and cow fields. Add safety checks to detect cow
  overflow and force fallback to the normal copy code for zero-copy
  sockets. [2]
  
  Reported by:    Anton Yuzhaninov <citrin citrin ru> [1]
  Suggested by:   alc [2]
  Reviewed by:    alc
  MFC after:      2 weeks
  
  Revision  Changes    Path
  1.28      +5 -1      src/sys/kern/uipc_cow.c
  1.375     +5 -1      src/sys/vm/vm_page.c
  1.156     +4 -4      src/sys/vm/vm_page.h