cvs commit: src/sys/fs/fdescfs fdesc.h fdesc_vfsops.c fdesc_vnops.c

Ulf Lilleengen lulf at
Mon Jun 30 15:42:00 UTC 2008

lulf        2008-06-30 15:41:57 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_7)
    sys/fs/fdescfs       fdesc.h fdesc_vfsops.c fdesc_vnops.c 
  SVN rev 180121 on 2008-06-30 15:41:57Z by lulf
  MFC rev r179288:
  - Add locking to all filesystem operations in fdescfs and flag it as MPSAFE.
  - Use proper synhronization primitives to protect the internal fdesc node cache
    used in fdescfs.
  - Properly initialize and uninitalize hash.
  - Remove unused functions.
  Since fdescfs might recurse on itself, adding proper locking to it needed some
  tricky workarounds in some parts to make it work. For instance, a descriptor in
  fdescfs could refer to an open descriptor to itself, thus forcing the thread to
  recurse on vnode locks. Because of this, other race conditions also had to be
  Approved by:    kib (mentor)
  Reviewed by:    kib (mentor)
  Tested by:      pho
  Revision   Changes    Path  +7 -2      src/sys/fs/fdescfs/fdesc.h   +34 -10    src/sys/fs/fdescfs/fdesc_vfsops.c  +158 -70   src/sys/fs/fdescfs/fdesc_vnops.c

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