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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Tue, 8 Jun 2010 17:54:28 +0000 (UTC)
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Subject: cvs commit: src/sys/kern vfs_bio.c
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kib         2010-06-08 17:54:28 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             vfs_bio.c 
  Log:
  SVN rev 208920 on 2010-06-08 17:54:28Z by kib
  
  Reorganize the code in bdwrite() which handles move of dirtiness
  from the buffer pages to buffer. Combine the code to set buffer
  dirty range (previously in vfs_setdirty()) and to clean the pages
  (vfs_clean_pages()) into new function vfs_clean_pages_dirty_buf(). Now
  the vm object lock is acquired only once.
  
  Drain the VPO_BUSY bit of the buffer pages before setting valid
  and clean bits in vfs_clean_pages_dirty_buf() with new helper
  vfs_drain_busy_pages(). pmap_clear_modify() asserts that page is not
  busy.
  
  In vfs_busy_pages(), move the wait for draining of VPO_BUSY before
  the dirtyness handling, to follow the structure of
  vfs_clean_pages_dirty_buf().
  
  Reported and tested by: pho
  Suggested and reviewed by:      alc
  MFC after:      2 weeks
  
  Revision  Changes    Path
  1.582     +65 -70    src/sys/kern/vfs_bio.c