Commits on Dec 21, 2016

1. issue 191: compile error on RHEL 7.3

   

   pubyun committed Dec 21, 2016
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2. Switch from ioctl to dm target messages for PID blacklist/whitelist m… …

   …anipulation
   
   In mainline 4.4 the ioctl() callback in the DM target has been removed
   in favour of a prepare_ioctl() which selects the underlying device,
   all ioctls are assume to apply to that.  In discussions with upstream on
   resolving this it was suggested that the correct mechanism for this
   kind of target focussed ioctl is actually DM target messages.  This
   patch converts the blacklist/whitelist manipulation over to these DM
   target messages.
   
   It also adds rather primative support to the flashcache_setioctl helper to
   switch to DM target messages when the existing ioctls are not supported
   (ENOTTY).  This is handled by calling out to dmsetup which offers a
   message command to form these requests.
   
   I would envisage it would be possible to reduce flashcache_setioctl to a
   simple shell script in the future once there is no possibility of these
   tools being used with a kernel supporting the ioctl only.
   
   This should fix the hard parts of issue facebookarchive#215.
   
   fixes: facebookarchive#215
   Signed-off-by: Andy Whitcroft <apw@ubuntu.com>

   

   Andy Whitcroft authored and pubyun committed Dec 21, 2016
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