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-rw-r--r--arch/um/drivers/cow.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/um/drivers/cow.h b/arch/um/drivers/cow.h
new file mode 100644
index 0000000000..9a67c01700
--- /dev/null
+++ b/arch/um/drivers/cow.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __COW_H__
+#define __COW_H__
+
+#include <asm/types.h>
+
+extern int init_cow_file(int fd, char *cow_file, char *backing_file,
+ int sectorsize, int alignment, int *bitmap_offset_out,
+ unsigned long *bitmap_len_out, int *data_offset_out);
+
+extern int file_reader(__u64 offset, char *buf, int len, void *arg);
+extern int read_cow_header(int (*reader)(__u64, char *, int, void *),
+ void *arg, __u32 *version_out,
+ char **backing_file_out, long long *mtime_out,
+ unsigned long long *size_out, int *sectorsize_out,
+ __u32 *align_out, int *bitmap_offset_out);
+
+extern int write_cow_header(char *cow_file, int fd, char *backing_file,
+ int sectorsize, int alignment,
+ unsigned long long *size);
+
+extern void cow_sizes(int version, __u64 size, int sectorsize, int align,
+ int bitmap_offset, unsigned long *bitmap_len_out,
+ int *data_offset_out);
+
+#endif