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From: Kenneth Merry <ken@FreeBSD.org>
Date: Sun, 29 Oct 2000 23:03:02 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/kern subr_diskslice.c src/sys/sys diskslice.h
         src/sys/cam/scsi scsi_cd.c
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ken         2000/10/29 23:03:02 PST

  Modified files:
    sys/kern             subr_diskslice.c 
    sys/sys              diskslice.h 
    sys/cam/scsi         scsi_cd.c 
  Log:
  Write support for the cd(4) driver.
  
  This allows writing to DVD-RAM, PD and similar drives that probe as CD
  devices.  Note that these are randomly writeable devices, not
  sequential-only devices like CD-R drives, which are supported by cdrecord.
  
  Add a new flag value for dsopen(), DSO_COMPATLABEL.  The cd(4) driver now
  uses this flag instead of the DSO_NOLABELS flag.  The DSO_NOLABELS always
  used a "fake" disklabel for the entire disk, provided by the caller.
  
  With the DSO_COMPATLABEL flag, dsopen() will first search the media for a
  label, and if it finds a label, it will use that label.  Otherwise it will
  use the fake disklabel provided by the caller.  This provides backwards
  compatibility, since we will still have labels for ISO9660 media.
  
  It also provides new functionality, since you can now have a regular BSD
  disklabel on read-only media, or on writeable media (e.g. DVD-RAM).
  
  Bruce and I both think that we should eventually (in a few years) get
  away from using disklabels for ISO9660 media, and just use the whole disk
  device (/dev/cd0).  At that point disklabel handling in the cd(4) driver
  could follow the "normal" model, as used in the da(4) driver.
  
  Also, clean up the path in a couple of places in cdregister().  (Thanks to
  Nick Hibma for catching that bug.)
  
  Reviewed by:	bde
  
  Revision  Changes    Path
  1.92      +22 -2     src/sys/kern/subr_diskslice.c
  1.40      +2 -1      src/sys/sys/diskslice.h
  1.42      +5 -3      src/sys/cam/scsi/scsi_cd.c



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