estat zpl and zvol scripts not compiling

[brad-lewis]

On 6.1.0.0 estat zpl and zvol scripts are failing to compile:

$ sudo estat zvol -m 5
In file included from /virtual/main.c:63:
/usr/src/zfs-5.4.0-64-dx2021012602-7a44e1b99-generic/include/sys/zvol_impl.h:53:2: error: unknown type name 'dataset_kstats_t'
dataset_kstats_t zv_kstat; /* zvol kstats */
^
/virtual/main.c:168:3: warning: 'memcpy' will always overflow; destination buffer has size 5, but size argument is 6 [-Wfortify-source]
__builtin_memcpy(&axis, "sync", WRITE_LENGTH);
^
/virtual/main.c:171:3: warning: 'memcpy' will always overflow; destination buffer has size 5, but size argument is 6 [-Wfortify-source]
__builtin_memcpy(&axis, "async", WRITE_LENGTH);
^
2 warnings and 1 error generated.
Traceback (most recent call last):
File "/usr/bin/estat", line 402, in
b = BPF(text=bpf_text, cflags=cflags, debug=debug_level)
File "/usr/lib/python3/dist-packages/bcc/init.py", line 364, in init
raise Exception("Failed to compile BPF module %s" % (src_file or ""))
Exception: Failed to compile BPF module

$ sudo estat zpl -m 5
/virtual/main.c:94:57: error: unknown type name 'uio_t'
zfs_read_write_entry(io_info_t *info, struct inode *ip, uio_t *uio, int flags)
^
/virtual/main.c:120:55: error: unknown type name 'uio_t'
zfs_read_entry(struct pt_regs *ctx, struct inode *ip, uio_t *uio, int flags)
^
/virtual/main.c:129:56: error: unknown type name 'uio_t'
zfs_write_entry(struct pt_regs *ctx, struct inode *ip, uio_t *uio, int flags)
^
/virtual/main.c:139:60: error: unknown type name 'uio_t'
zfs_read_write_exit(struct pt_regs *ctx, struct inode *ip, uio_t *uio)
^
4 errors generated.
Traceback (most recent call last):
File "/usr/bin/estat", line 402, in
b = BPF(text=bpf_text, cflags=cflags, debug=debug_level)
File "/usr/lib/python3/dist-packages/bcc/init.py", line 364, in init
raise Exception("Failed to compile BPF module %s" % (src_file or ""))
Exception: Failed to compile BPF module