[PATCH 09/12] xfs_io: create exchangerange command to test file range exchange ioctl

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From: Darrick J. Wong <djwong@xxxxxxxxxx>

Create a new xfs_io command to make raw calls to the
XFS_IOC_EXCHANGE_RANGE ioctl.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
 io/Makefile       |   48 ++++++++++++++--
 io/exchrange.c    |  156 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 io/init.c         |    1 
 io/io.h           |    1 
 man/man8/xfs_io.8 |   40 ++++++++++++++
 5 files changed, 239 insertions(+), 7 deletions(-)
 create mode 100644 io/exchrange.c


diff --git a/io/Makefile b/io/Makefile
index 17d499de9..3192b813c 100644
--- a/io/Makefile
+++ b/io/Makefile
@@ -8,13 +8,47 @@ include $(TOPDIR)/include/builddefs
 LTCOMMAND = xfs_io
 LSRCFILES = xfs_bmap.sh xfs_freeze.sh xfs_mkfile.sh
 HFILES = init.h io.h
-CFILES = init.c \
-	attr.c bmap.c bulkstat.c crc32cselftest.c cowextsize.c encrypt.c \
-	file.c freeze.c fsuuid.c fsync.c getrusage.c imap.c inject.c label.c \
-	link.c mmap.c open.c parent.c pread.c prealloc.c pwrite.c reflink.c \
-	resblks.c scrub.c seek.c shutdown.c stat.c swapext.c sync.c \
-	truncate.c utimes.c fadvise.c sendfile.c madvise.c mincore.c fiemap.c \
-	sync_file_range.c readdir.c
+CFILES = \
+	attr.c \
+	bmap.c \
+	bulkstat.c \
+	cowextsize.c \
+	crc32cselftest.c \
+	encrypt.c \
+	exchrange.c \
+	fadvise.c \
+	fiemap.c \
+	file.c \
+	freeze.c \
+	fsuuid.c \
+	fsync.c \
+	getrusage.c \
+	imap.c \
+	init.c \
+	inject.c \
+	label.c \
+	link.c \
+	madvise.c \
+	mincore.c \
+	mmap.c \
+	open.c \
+	parent.c \
+	pread.c \
+	prealloc.c \
+	pwrite.c \
+	readdir.c \
+	reflink.c \
+	resblks.c \
+	scrub.c \
+	seek.c \
+	sendfile.c \
+	shutdown.c \
+	stat.c \
+	swapext.c \
+	sync.c \
+	sync_file_range.c \
+	truncate.c \
+	utimes.c
 
 LLDLIBS = $(LIBXCMD) $(LIBHANDLE) $(LIBFROG) $(LIBPTHREAD) $(LIBUUID)
 LTDEPENDENCIES = $(LIBXCMD) $(LIBHANDLE) $(LIBFROG)
diff --git a/io/exchrange.c b/io/exchrange.c
new file mode 100644
index 000000000..016429280
--- /dev/null
+++ b/io/exchrange.c
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2020-2024 Oracle.  All Rights Reserved.
+ * Author: Darrick J. Wong <djwong@xxxxxxxxxx>
+ */
+#include "command.h"
+#include "input.h"
+#include "init.h"
+#include "io.h"
+#include "libfrog/logging.h"
+#include "libfrog/fsgeom.h"
+#include "libfrog/file_exchange.h"
+#include "libfrog/bulkstat.h"
+
+static void
+exchangerange_help(void)
+{
+	printf(_(
+"\n"
+" Exchange file data between the open file descriptor and the supplied filename.\n"
+" -C   -- Print timing information in a condensed format\n"
+" -d N -- Start exchanging contents at this position in the open file\n"
+" -f   -- Flush changed file data and metadata to disk\n"
+" -l N -- Exchange this many bytes between the two files instead of to EOF\n"
+" -n   -- Dry run; do all the parameter validation but do not change anything.\n"
+" -s N -- Start exchanging contents at this position in the supplied file\n"
+" -t   -- Print timing information\n"
+" -w   -- Only exchange written ranges in the supplied file\n"
+));
+}
+
+static int
+exchangerange_f(
+	int			argc,
+	char			**argv)
+{
+	struct xfs_exchange_range	fxr;
+	struct stat		stat;
+	struct timeval		t1, t2;
+	uint64_t		flags = XFS_EXCHANGE_RANGE_TO_EOF;
+	int64_t			src_offset = 0;
+	int64_t			dest_offset = 0;
+	int64_t			length = -1;
+	size_t			fsblocksize, fssectsize;
+	int			condensed = 0, quiet_flag = 1;
+	int			c;
+	int			fd;
+	int			ret;
+
+	init_cvtnum(&fsblocksize, &fssectsize);
+	while ((c = getopt(argc, argv, "Ccd:fl:ns:tw")) != -1) {
+		switch (c) {
+		case 'C':
+			condensed = 1;
+			break;
+		case 'd':
+			dest_offset = cvtnum(fsblocksize, fssectsize, optarg);
+			if (dest_offset < 0) {
+				printf(
+			_("non-numeric open file offset argument -- %s\n"),
+						optarg);
+				return 0;
+			}
+			break;
+		case 'f':
+			flags |= XFS_EXCHANGE_RANGE_DSYNC;
+			break;
+		case 'l':
+			length = cvtnum(fsblocksize, fssectsize, optarg);
+			if (length < 0) {
+				printf(
+			_("non-numeric length argument -- %s\n"),
+						optarg);
+				return 0;
+			}
+			flags &= ~XFS_EXCHANGE_RANGE_TO_EOF;
+			break;
+		case 'n':
+			flags |= XFS_EXCHANGE_RANGE_DRY_RUN;
+			break;
+		case 's':
+			src_offset = cvtnum(fsblocksize, fssectsize, optarg);
+			if (src_offset < 0) {
+				printf(
+			_("non-numeric supplied file offset argument -- %s\n"),
+						optarg);
+				return 0;
+			}
+			break;
+		case 't':
+			quiet_flag = 0;
+			break;
+		case 'w':
+			flags |= XFS_EXCHANGE_RANGE_FILE1_WRITTEN;
+			break;
+		default:
+			exchangerange_help();
+			return 0;
+		}
+	}
+	if (optind != argc - 1) {
+		exchangerange_help();
+		return 0;
+	}
+
+	/* open the donor file */
+	fd = openfile(argv[optind], NULL, 0, 0, NULL);
+	if (fd < 0)
+		return 0;
+
+	ret = fstat(file->fd, &stat);
+	if (ret) {
+		perror("fstat");
+		exitcode = 1;
+		goto out;
+	}
+	if (length < 0)
+		length = stat.st_size;
+
+	xfrog_exchangerange_prep(&fxr, dest_offset, fd, src_offset, length);
+	ret = xfrog_exchangerange(file->fd, &fxr, flags);
+	if (ret) {
+		xfrog_perror(ret, "exchangerange");
+		exitcode = 1;
+		goto out;
+	}
+	if (quiet_flag)
+		goto out;
+
+	gettimeofday(&t2, NULL);
+	t2 = tsub(t2, t1);
+
+	report_io_times("exchangerange", &t2, dest_offset, length, length, 1,
+			condensed);
+out:
+	close(fd);
+	return 0;
+}
+
+static struct cmdinfo exchangerange_cmd = {
+	.name		= "exchangerange",
+	.cfunc		= exchangerange_f,
+	.argmin		= 1,
+	.argmax		= -1,
+	.flags		= CMD_FLAG_ONESHOT | CMD_NOMAP_OK,
+	.help		= exchangerange_help,
+};
+
+void
+exchangerange_init(void)
+{
+	exchangerange_cmd.args = _("[-Cfntw] [-d dest_offset] [-s src_offset] [-l length] <donorfile>");
+	exchangerange_cmd.oneline = _("Exchange contents between files.");
+
+	add_command(&exchangerange_cmd);
+}
diff --git a/io/init.c b/io/init.c
index 104cd2c12..37e0f093c 100644
--- a/io/init.c
+++ b/io/init.c
@@ -88,6 +88,7 @@ init_commands(void)
 	truncate_init();
 	utimes_init();
 	crc32cselftest_init();
+	exchangerange_init();
 }
 
 /*
diff --git a/io/io.h b/io/io.h
index e06dff53f..fdb715ff0 100644
--- a/io/io.h
+++ b/io/io.h
@@ -149,3 +149,4 @@ extern void		scrub_init(void);
 extern void		repair_init(void);
 extern void		crc32cselftest_init(void);
 extern void		bulkstat_init(void);
+void			exchangerange_init(void);
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 3ce280a75..2a7c67f7c 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -713,6 +713,46 @@ Swaps extent forks between files. The current open file is the target. The donor
 file is specified by path. Note that file data is not copied (file content moves
 with the fork(s)).
 .TP
+.BI "exchangerange [OPTIONS]" donor_file "
+Exchanges contents between files.
+The current open file is the target.
+The donor file is specified by path.
+Note that file data is not copied (file content moves with the fork(s)).
+Options include:
+.RS 1.0i
+.PD 0
+.TP 0.4i
+.TP
+.B \-C
+Print timing information in a condensed format.
+.TP
+.BI \-d " dest_offset"
+Swap extents with open file beginning at
+.IR dest_offset .
+.TP
+.B \-f
+Flush changed file data and file metadata to disk.
+.TP
+.BI \-l " length"
+Swap up to
+.I length
+bytes of data.
+.TP
+.B \-n
+Perform all the parameter validation checks but don't change anything.
+.TP
+.BI \-s " src_offset"
+Swap extents with donor file beginning at
+.IR src_offset .
+.TP
+.B \-t
+Print timing information.
+.TP
+.B \-w
+Only exchange written ranges in the supplied file.
+.RE
+.PD
+.TP
 .BI "set_encpolicy [ \-c " mode " ] [ \-n " mode " ] [ \-f " flags " ] [ \-s " log2_dusize " ] [ \-v " version " ] [ " keyspec " ]"
 On filesystems that support encryption, assign an encryption policy to the
 current file.





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