bcachefs: support get fs label

Implement support for FS_IOC_GETFSLABEL ioctl to read filesystem
label.

Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Hongbo Li 2024-06-03 21:26:19 +08:00 • committed by Kent Overstreet
commit 81bce3cf2b