Hi All,
One more weird issue, this works on old xen but fails on 4.4:
xendev01 ~ # mkdir /mnt/test
xendev01 ~ # mount -t tmpfs - /mnt/test
xendev01 ~ # dd if=/dev/null of=/mnt/test/disk seek=100M bs=1
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.000201809 s, 0.0 kB/s
xendev01 ~ # /usr/sbin/xl block-attach nathannx "file:/mnt/test/disk" "xvdd4"
DEBUG libxl__blktap_devpath 37 aio:/mnt/test/disk
DEBUG libxl__blktap_devpath 40 /dev/xen/blktap-2/tapdev20
xendev01 ~ # xl block-detach nathannx 51764
DEBUG libxl__device_destroy_tapdisk 66 type=aio:/mnt/test/disk
disk=:/mnt/test/disk
xendev01 ~ # mount -o remount,ro /mnt/test
xendev01 ~ # /usr/sbin/xl block-attach nathannx "file:/mnt/test/disk" "xvdd4"
DEBUG libxl__blktap_devpath 37 aio:/mnt/test/disk
libxl: error: libxl.c:2149:device_disk_add: failed to get blktap devpath for
0xd3abd0
libxl: error: libxl.c:1727:device_addrm_aocomplete: unable to (null) device
libxl_device_disk_add failed.
I'm not sure why xen would care if the disk is writable? Would be nice to be
able to mount these since many NFS storage arrays provide read only access to
snapshots.
- Nathan
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