BLK mode devices emitted by the libnvdimm sub-system [1] have a "." in
their name. When parted calls _probe_sys_block() it trips over this
fact and unconditionally re-writes the block device name.
/* in /sys/block, '/'s are replaced with '!' or '.' */
for (ptr = dev_name; *ptr != '\0'; ptr++) {
if (*ptr == '!' || *ptr == '.')
*ptr = '/';
}
This is confirmed by strace where parted emits calls to
lstat("/dev/ndblk2", 0x7ffec6b33e50) = -1 ENOENT (No such file or directory)
stat("/dev/ndblk2/0", 0x7ffec6b33dc0) = -1 ENOENT (No such file or directory)
The original BLK device name is /dev/ndblk2.0.
This can be reproduced with a 4.2-rc1+ kernel and the nfit_test
module. See the libndctl readme for instructions on getting the test
environment running [2].
[1]:
https://git.kernel.org/cgit/linux/kernel/git/djbw/nvdimm.git/tree/Documentation/nvdimm/nvdimm.txt?h=libnvdimm-for-next
[2]: https://github.com/pmem/ndctl
