cvs commit: src/sys/cam/scsi scsi_sa.c

[Matt Jacob]

mjacob      2006-01-14 14:32:41 UTC

  FreeBSD src repository

  Modified files:
    sys/cam/scsi         scsi_sa.c 
  Log:
  Incorporate the O_NONBLOCK open semantics of Linux and Solaris. This allows
  an application to upon a tape (yea, even the non-control device) even if
  it cannot establish a mount session. If the open cannot establish a mount
  session and O_NONBLOCK was specified, the tape becomes 'open pending mount'.
  All I/O operations that would require access to a tape thereafter until
  a close attempt to initiate the mount session. If the mount session succeeds,
  the tape driver transitions to full open state, else returns an appropriate
  I/O error (ENXIO).
  
  At the same time, add a change that remembers whether tape is being opened
  read-only. If so, disallow 'write' operations like writing filemarks that
  bypass the normal read-only filtering operations that happen in the write(2)
  syscall.
  
  Reviewed by:    ken, justin, grog
  MFC after:      2 weeks
  Suggested by:   The Bacula Team
  
  Revision  Changes    Path
  1.106     +87 -6     src/sys/cam/scsi/scsi_sa.c