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[04/12] libfrog: add support for exchange range ioctl family

Message ID 172229844457.1344699.8587837512292274839.stgit@frogsfrogsfrogs (mailing list archive)
State Accepted, archived
Headers show
Series [01/12] man: document the exchange-range ioctl | expand

Commit Message

Darrick J. Wong July 30, 2024, 12:54 a.m. UTC 
From: Darrick J. Wong <djwong@kernel.org>

Add some library code to support the new file range exchange and commit
ioctls.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 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 mbox series

Patch

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@kernel.org>
+ */
+#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__ */