cvs commit: src/sys/kern vfs_bio.c vfs_mount.c

[Warner Losh]

imp         2007-12-27 16:38:29 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             vfs_bio.c vfs_mount.c 
  Log:
  A partial solution to some of the 'pull the umass device with a
  mounted FS' problems.  These are more along the lines of 'avoiding an
  avoidable panic' than a complete solution to removable devices.  We
  now close the barn door after the horse has gotten lose and has been
  hit by a truck, as it were.  The barn no longer catches fire in this
  case, but the horse is still dead :-).
  
  The vfs_bio.c fix causes us not to put a failed write back into the
  dirty pool if the error returned was ENXIO.  In that case, the buffer
  is treated like any other clean buffer that's being retured.  ENXIO
  means the device isn't there anymore and will never be there again in
  the future, so retrying is futile.
  
  The vfs_mount.c fix treats 'ENXIO' as success for unmounting a file
  system.  If the device is gone, retrying later won't help and we'll
  never be able to unmount the device.
  
  These two are part of a larger patch set submitted by the author.  The
  other patches will be forth coming.  I added comments to these two
  patches.
  
  Submitted by: Henrik Gulbrandsen
  Reviewed by: phk@
  PR: usb/46176 (partial)
  
  Revision  Changes    Path
  1.531     +4 -0      src/sys/kern/vfs_bio.c
  1.269     +7 -2      src/sys/kern/vfs_mount.c