[libvirt] [PATCH 5/5]: Rewrite findLuns function

[Chris Lalancette]

Chris Lalancette wrote:
> Reposting the 5/5 patch with Jim's minor comments fixed up.  Compile tested only
> with his changes.
> 
> This rather large patch rewrites the virStorageBackendISCSIFindLUNs() function
> to only rely on sysfs for finding LUNs, given a session number.  Along the way,
> it also fixes the bug where we wouldn't find LUNs for older kernels (with the
> block:sda format), and also (possibly) fixes a race condition where we could try
> to find the LUN before udev has finished connecting it.  I say it "possibly"
> fixes it because I haven't been able to hit it so far, but I definitely need
> more testing to try and confirm.
> 
> Changes since last time:
> 1)  Don't blindly ignore the 0'th LUN (thanks Stefan).  Instead, look if the
> LUNs are Direct-Access devices (as defined by the kernel); if so, they are LUNs
> we can use.
> 2)  Fix up whitespace damage.
> 3)  Check the return value of the scsidev strdup as pointed out by Jim.
> 4)  Change all ISCSIADM commands to be const char *const as pointed out by Jim.
> 
> Signed-off-by: Chris Lalancette <clalance at redhat.com>

Committed

Chris Lalancette