Bug in Samba's implementation of FSCTL_QUERY_ALLOCATED_RANGES?

[David Howells]

Okay, that fixes the problem.

For reference, the file can be prepared thusly:

	xfs_io -c "pwrite 0 16M" -c "fpunch 0 1M" -c "fpunch 2M 1M" -c "fpunch 4M 1M" -c "fpunch 6M 1M" -c "fpunch 8M 1M" /xfstest.test/foo

and then the test run:

	xfs_io -c "seek -h 1" /xfstest.test/foo

Something like punch-hole is needed to set the sparse flag - otherwise QAR
isn't used by llseek().

So:

	Tested-by: David Howells <dhowells at redhat.com>

if you need it.

The Fedora samba version I applied this to was:

	samba-4.19.7-1.fc39.x86_64

though I had to drop the testing bits as they didn't build.

David