libzfs: const'ify path argument to zfs_path_to_zhandle

zfs_path_to_zhandle has no need to mutate the path argument,
most notably:

- zfs_open takes path as const
- getextmntent takes path as const
- fprintf most clearly doesn't need to mutate it

It's hard to foresee any reason that libzfs could conceivably
want to mutate it in the future, either, so const'ify it.

Reviewed-by: Ryan Moeller <[email protected]>
Reviewed-by: Matt Ahrens <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Kyle Evans <[email protected]>
Closes #10605 

1 files changed, 2 insertions, 1 deletions

diff --git a/include/libzfs.h b/include/libzfs.h
index 6f797c0a3..b405ad1e1 100644
--- a/include/libzfs.h
+++ b/include/libzfs.h
@@ -789,7 +789,8 @@ extern int zfs_show_diffs(zfs_handle_t *, int, const char *, const char *,
 extern const char *zfs_type_to_name(zfs_type_t);
 extern void zfs_refresh_properties(zfs_handle_t *);
 extern int zfs_name_valid(const char *, zfs_type_t);
-extern zfs_handle_t *zfs_path_to_zhandle(libzfs_handle_t *, char *, zfs_type_t);
+extern zfs_handle_t *zfs_path_to_zhandle(libzfs_handle_t *, const char *,
+    zfs_type_t);
 extern int zfs_parent_name(zfs_handle_t *, char *, size_t);
 extern boolean_t zfs_dataset_exists(libzfs_handle_t *, const char *,
     zfs_type_t);