From: Darrick J. Wong <djwong@xxxxxxxxxx>
Add some library code to support the new file range exchange and commit
ioctls.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
libfrog/Makefile | 2 ++
libfrog/file_exchange.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++
libfrog/file_exchange.h | 15 ++++++++++++++
3 files changed, 69 insertions(+)
create mode 100644 libfrog/file_exchange.c
create mode 100644 libfrog/file_exchange.h
diff --git a/libfrog/Makefile b/libfrog/Makefile
index cafee073f..53e3c3492 100644
--- a/libfrog/Makefile
+++ b/libfrog/Makefile
@@ -18,6 +18,7 @@ bitmap.c \
bulkstat.c \
convert.c \
crc32.c \
+file_exchange.c \
fsgeom.c \
list_sort.c \
linux.c \
@@ -42,6 +43,7 @@ crc32defs.h \
crc32table.h \
dahashselftest.h \
div64.h \
+file_exchange.h \
fsgeom.h \
logging.h \
paths.h \
diff --git a/libfrog/file_exchange.c b/libfrog/file_exchange.c
new file mode 100644
index 000000000..29fdc17e5
--- /dev/null
+++ b/libfrog/file_exchange.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2020-2024 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <djwong@xxxxxxxxxx>
+ */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <string.h>
+#include "xfs.h"
+#include "fsgeom.h"
+#include "bulkstat.h"
+#include "libfrog/file_exchange.h"
+
+/* Prepare for a file contents exchange. */
+void
+xfrog_exchangerange_prep(
+ struct xfs_exchange_range *fxr,
+ off_t file2_offset,
+ int file1_fd,
+ off_t file1_offset,
+ uint64_t length)
+{
+ memset(fxr, 0, sizeof(*fxr));
+
+ fxr->file1_fd = file1_fd;
+ fxr->file1_offset = file1_offset;
+ fxr->length = length;
+ fxr->file2_offset = file2_offset;
+}
+
+/*
+ * Execute an exchange-range operation. Returns 0 for success or a negative
+ * errno.
+ */
+int
+xfrog_exchangerange(
+ int file2_fd,
+ struct xfs_exchange_range *fxr,
+ uint64_t flags)
+{
+ int ret;
+
+ fxr->flags = flags;
+
+ ret = ioctl(file2_fd, XFS_IOC_EXCHANGE_RANGE, fxr);
+ if (ret)
+ return -errno;
+
+ return 0;
+}
diff --git a/libfrog/file_exchange.h b/libfrog/file_exchange.h
new file mode 100644
index 000000000..b6f6f9f69
--- /dev/null
+++ b/libfrog/file_exchange.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2020-2024 Oracle. All rights reserved.
+ * All Rights Reserved.
+ */
+#ifndef __LIBFROG_FILE_EXCHANGE_H__
+#define __LIBFROG_FILE_EXCHANGE_H__
+
+void xfrog_exchangerange_prep(struct xfs_exchange_range *fxr,
+ off_t file2_offset, int file1_fd,
+ off_t file1_offset, uint64_t length);
+int xfrog_exchangerange(int file2_fd, struct xfs_exchange_range *fxr,
+ uint64_t flags);
+
+#endif /* __LIBFROG_FILE_EXCHANGE_H__ */
