[PATCH 1/2] misc: privatize the FIEXCHANGE ioctl for now

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From: Darrick J. Wong <djwong@xxxxxxxxxx>

I'm abandoning (for now) efforts to bring atomic file content exchanges
to the VFS.  The goal here is to reduce friction in getting online fsck
merged, so Dave and I want to take this back to being a private XFS
ioctl so we can explore with it for a while before committing it to the
stable KABI.

Shift all the existing FIEXCHANGE usage to XFS_IOC_EXCHANGE_RANGE, and
try to pick it up from xfs_fs_staging.h if the system xfslibs-dev
package has such an animal.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 configure.ac          |    2 +-
 doc/group-names.txt   |    2 +-
 include/builddefs.in  |    2 +-
 ltp/Makefile          |    4 ++--
 ltp/fsstress.c        |   10 +++++-----
 ltp/fsx.c             |   20 ++++++++++----------
 m4/package_libcdev.m4 |   19 -------------------
 m4/package_xfslibs.m4 |   14 ++++++++++++++
 src/Makefile          |    4 ++++
 src/fiexchange.h      |   44 ++++++++++++++++++++++----------------------
 src/global.h          |    4 +---
 src/vfs/Makefile      |    4 ++++
 tests/generic/724     |    2 +-
 tests/xfs/122.out     |    1 +
 tests/xfs/791         |    2 +-
 15 files changed, 68 insertions(+), 66 deletions(-)


diff --git a/configure.ac b/configure.ac
index 7333045330..b22fc52bff 100644
--- a/configure.ac
+++ b/configure.ac
@@ -70,7 +70,7 @@ AC_HAVE_SEEK_DATA
 AC_HAVE_BMV_OF_SHARED
 AC_HAVE_NFTW
 AC_HAVE_RLIMIT_NOFILE
-AC_HAVE_FIEXCHANGE
+AC_HAVE_XFS_IOC_EXCHANGE_RANGE
 AC_HAVE_FICLONE
 
 AC_CHECK_FUNCS([renameat2])
diff --git a/doc/group-names.txt b/doc/group-names.txt
index c3dcca3755..fec6bf71ab 100644
--- a/doc/group-names.txt
+++ b/doc/group-names.txt
@@ -52,7 +52,7 @@ enospc			ENOSPC error reporting
 exportfs		file handles
 fiemap			fiemap ioctl
 filestreams		XFS filestreams allocator
-fiexchange		FIEXCHANGE_RANGE ioctl
+fiexchange		XFS_IOC_EXCHANGE_RANGE ioctl
 freeze			filesystem freeze tests
 fsck			general fsck tests
 fsmap			FS_IOC_GETFSMAP ioctl
diff --git a/include/builddefs.in b/include/builddefs.in
index 446350d5fc..ce95fe7d4b 100644
--- a/include/builddefs.in
+++ b/include/builddefs.in
@@ -72,7 +72,7 @@ HAVE_SEEK_DATA = @have_seek_data@
 HAVE_NFTW = @have_nftw@
 HAVE_BMV_OF_SHARED = @have_bmv_of_shared@
 HAVE_RLIMIT_NOFILE = @have_rlimit_nofile@
-HAVE_FIEXCHANGE = @have_fiexchange@
+HAVE_XFS_IOC_EXCHANGE_RANGE = @have_xfs_ioc_exchange_range@
 HAVE_FICLONE = @have_ficlone@
 
 GCCFLAGS = -funsigned-char -fno-strict-aliasing -Wall
diff --git a/ltp/Makefile b/ltp/Makefile
index c2b70d896e..c0b2824076 100644
--- a/ltp/Makefile
+++ b/ltp/Makefile
@@ -36,8 +36,8 @@ ifeq ($(HAVE_COPY_FILE_RANGE),yes)
 LCFLAGS += -DHAVE_COPY_FILE_RANGE
 endif
 
-ifeq ($(HAVE_FIEXCHANGE),yes)
-LCFLAGS += -DHAVE_FIEXCHANGE
+ifeq ($(HAVE_XFS_IOC_EXCHANGE_RANGE),yes)
+LCFLAGS += -DHAVE_XFS_IOC_EXCHANGE_RANGE
 endif
 
 default: depend $(TARGETS)
diff --git a/ltp/fsstress.c b/ltp/fsstress.c
index abe2874253..2681ed2b08 100644
--- a/ltp/fsstress.c
+++ b/ltp/fsstress.c
@@ -2592,8 +2592,8 @@ xchgrange_f(
 	opnum_t			opno,
 	long			r)
 {
-#ifdef FIEXCHANGE_RANGE
-	struct file_xchg_range	fxr = { 0 };
+#ifdef XFS_IOC_EXCHANGE_RANGE
+	struct xfs_exch_range	fxr = { 0 };
 	static __u64		swap_flags = 0;
 	struct pathname		fpath1;
 	struct pathname		fpath2;
@@ -2721,10 +2721,10 @@ xchgrange_f(
 	fxr.flags = swap_flags;
 
 retry:
-	ret = ioctl(fd2, FIEXCHANGE_RANGE, &fxr);
+	ret = ioctl(fd2, XFS_IOC_EXCHANGE_RANGE, &fxr);
 	e = ret < 0 ? errno : 0;
-	if (e == EOPNOTSUPP && !(swap_flags & FILE_XCHG_RANGE_NONATOMIC)) {
-		swap_flags = FILE_XCHG_RANGE_NONATOMIC;
+	if (e == EOPNOTSUPP && !(swap_flags & XFS_EXCH_RANGE_NONATOMIC)) {
+		swap_flags = XFS_EXCH_RANGE_NONATOMIC;
 		fxr.flags |= swap_flags;
 		goto retry;
 	}
diff --git a/ltp/fsx.c b/ltp/fsx.c
index a30e2a8dbc..777ba0de5d 100644
--- a/ltp/fsx.c
+++ b/ltp/fsx.c
@@ -1389,27 +1389,27 @@ do_insert_range(unsigned offset, unsigned length)
 }
 #endif
 
-#ifdef FIEXCHANGE_RANGE
+#ifdef XFS_IOC_EXCHANGE_RANGE
 static __u64 swap_flags = 0;
 
 int
 test_xchg_range(void)
 {
-	struct file_xchg_range	fsr = {
+	struct xfs_exch_range	fsr = {
 		.file1_fd = fd,
-		.flags = FILE_XCHG_RANGE_DRY_RUN | swap_flags,
+		.flags = XFS_EXCH_RANGE_DRY_RUN | swap_flags,
 	};
 	int ret, e;
 
 retry:
-	ret = ioctl(fd, FIEXCHANGE_RANGE, &fsr);
+	ret = ioctl(fd, XFS_IOC_EXCHANGE_RANGE, &fsr);
 	e = ret < 0 ? errno : 0;
-	if (e == EOPNOTSUPP && !(swap_flags & FILE_XCHG_RANGE_NONATOMIC)) {
+	if (e == EOPNOTSUPP && !(swap_flags & XFS_EXCH_RANGE_NONATOMIC)) {
 		/*
 		 * If the call fails with atomic mode, try again with non
 		 * atomic mode.
 		 */
-		swap_flags = FILE_XCHG_RANGE_NONATOMIC;
+		swap_flags = XFS_EXCH_RANGE_NONATOMIC;
 		fsr.flags |= swap_flags;
 		goto retry;
 	}
@@ -1427,7 +1427,7 @@ test_xchg_range(void)
 void
 do_xchg_range(unsigned offset, unsigned length, unsigned dest)
 {
-	struct file_xchg_range	fsr = {
+	struct xfs_exch_range	fsr = {
 		.file1_fd = fd,
 		.file1_offset = offset,
 		.file2_offset = dest,
@@ -1470,10 +1470,10 @@ do_xchg_range(unsigned offset, unsigned length, unsigned dest)
 			testcalls, offset, offset+length, length, dest);
 	}
 
-	if (ioctl(fd, FIEXCHANGE_RANGE, &fsr) == -1) {
+	if (ioctl(fd, XFS_IOC_EXCHANGE_RANGE, &fsr) == -1) {
 		prt("exchange range: 0x%x to 0x%x at 0x%x\n", offset,
 				offset + length, dest);
-		prterr("do_xchg_range: FIEXCHANGE_RANGE");
+		prterr("do_xchg_range: XFS_IOC_EXCHANGE_RANGE");
 		report_failure(161);
 		goto out_free;
 	}
@@ -2452,7 +2452,7 @@ usage(void)
 #ifdef HAVE_COPY_FILE_RANGE
 "	-E: Do not use copy range calls\n"
 #endif
-#ifdef FIEXCHANGE_RANGE
+#ifdef XFS_IOC_EXCHANGE_RANGE
 "	-0: Do not use exchange range calls\n"
 #endif
 "	-K: Do not use keep size\n\
diff --git a/m4/package_libcdev.m4 b/m4/package_libcdev.m4
index 91eb64db21..d5d88b8e44 100644
--- a/m4/package_libcdev.m4
+++ b/m4/package_libcdev.m4
@@ -155,25 +155,6 @@ AC_DEFUN([AC_HAVE_RLIMIT_NOFILE],
     AC_SUBST(have_rlimit_nofile)
   ])
 
-#
-# Check if we have a FIEXCHANGE_RANGE ioctl (Linux)
-#
-AC_DEFUN([AC_HAVE_FIEXCHANGE],
-  [ AC_MSG_CHECKING([for FIEXCHANGE_RANGE])
-    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
-#define _GNU_SOURCE
-#include <sys/syscall.h>
-#include <sys/ioctl.h>
-#include <unistd.h>
-#include <linux/fs.h>
-#include <linux/fiexchange.h>
-    ]], [[
-         struct file_xchg_range fxr;
-         ioctl(-1, FIEXCHANGE_RANGE, &fxr);
-    ]])],[have_fiexchange=yes
-       AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)])
-    AC_SUBST(have_fiexchange)
-
 # Check if we have FICLONE
 AC_DEFUN([AC_HAVE_FICLONE],
   [ AC_MSG_CHECKING([for FICLONE])
diff --git a/m4/package_xfslibs.m4 b/m4/package_xfslibs.m4
index 8ef58cc064..1549360df6 100644
--- a/m4/package_xfslibs.m4
+++ b/m4/package_xfslibs.m4
@@ -119,3 +119,17 @@ AC_DEFUN([AC_HAVE_BMV_OF_SHARED],
        AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)])
     AC_SUBST(have_bmv_of_shared)
   ])
+
+# Check if we have XFS_IOC_EXCHANGE_RANGE
+AC_DEFUN([AC_HAVE_XFS_IOC_EXCHANGE_RANGE],
+  [ AC_MSG_CHECKING([for XFS_IOC_EXCHANGE_RANGE])
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#define _GNU_SOURCE
+#include <xfs/xfs.h>
+    ]], [[
+         struct xfs_exch_range obj;
+         ioctl(-1, XFS_IOC_EXCHANGE_RANGE, &obj);
+    ]])],[have_xfs_ioc_exchange_range=yes
+       AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)])
+    AC_SUBST(have_xfs_ioc_exchange_range)
+  ])
diff --git a/src/Makefile b/src/Makefile
index 49dd2f6c1e..8160a0e8ec 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -98,6 +98,10 @@ ifeq ($(HAVE_FICLONE),yes)
      TARGETS += t_reflink_read_race
 endif
 
+ifeq ($(HAVE_XFS_IOC_EXCHANGE_RANGE),yes)
+LCFLAGS += -DHAVE_XFS_IOC_EXCHANGE_RANGE
+endif
+
 CFILES = $(TARGETS:=.c)
 LDIRT = $(TARGETS) fssum
 
diff --git a/src/fiexchange.h b/src/fiexchange.h
index 29b3ac0ff5..6a3ae8964d 100644
--- a/src/fiexchange.h
+++ b/src/fiexchange.h
@@ -16,13 +16,13 @@
  * called against (which we'll call file2).  Filesystems must be able to
  * restart and complete the operation even after the system goes down.
  */
-struct file_xchg_range {
+struct xfs_exch_range {
 	__s64		file1_fd;
 	__s64		file1_offset;	/* file1 offset, bytes */
 	__s64		file2_offset;	/* file2 offset, bytes */
 	__s64		length;		/* bytes to exchange */
 
-	__u64		flags;		/* see FILE_XCHG_RANGE_* below */
+	__u64		flags;		/* see XFS_EXCH_RANGE_* below */
 
 	/* file2 metadata for optional freshness checks */
 	__s64		file2_ino;	/* inode number */
@@ -38,39 +38,39 @@ struct file_xchg_range {
  * Atomic exchange operations are not required.  This relaxes the requirement
  * that the filesystem must be able to complete the operation after a crash.
  */
-#define FILE_XCHG_RANGE_NONATOMIC	(1 << 0)
+#define XFS_EXCH_RANGE_NONATOMIC	(1 << 0)
 
 /*
  * Check that file2's inode number, mtime, and ctime against the values
  * provided, and return -EBUSY if there isn't an exact match.
  */
-#define FILE_XCHG_RANGE_FILE2_FRESH	(1 << 1)
+#define XFS_EXCH_RANGE_FILE2_FRESH	(1 << 1)
 
 /*
  * Check that the file1's length is equal to file1_offset + length, and that
  * file2's length is equal to file2_offset + length.  Returns -EDOM if there
  * isn't an exact match.
  */
-#define FILE_XCHG_RANGE_FULL_FILES	(1 << 2)
+#define XFS_EXCH_RANGE_FULL_FILES	(1 << 2)
 
 /*
  * Exchange file data all the way to the ends of both files, and then exchange
  * the file sizes.  This flag can be used to replace a file's contents with a
  * different amount of data.  length will be ignored.
  */
-#define FILE_XCHG_RANGE_TO_EOF		(1 << 3)
+#define XFS_EXCH_RANGE_TO_EOF		(1 << 3)
 
 /* Flush all changes in file data and file metadata to disk before returning. */
-#define FILE_XCHG_RANGE_FSYNC		(1 << 4)
+#define XFS_EXCH_RANGE_FSYNC		(1 << 4)
 
 /* Dry run; do all the parameter verification but do not change anything. */
-#define FILE_XCHG_RANGE_DRY_RUN		(1 << 5)
+#define XFS_EXCH_RANGE_DRY_RUN		(1 << 5)
 
 /*
- * Do not exchange any part of the range where file1's mapping is a hole.  This
- * can be used to emulate scatter-gather atomic writes with a temp file.
+ * Only exchange ranges where file1's range maps to a written extent.  This can
+ * be used to emulate scatter-gather atomic writes with a temp file.
  */
-#define FILE_XCHG_RANGE_SKIP_FILE1_HOLES (1 << 6)
+#define XFS_EXCH_RANGE_FILE1_WRITTEN	(1 << 6)
 
 /*
  * Commit the contents of file1 into file2 if file2 has the same inode number,
@@ -83,19 +83,19 @@ struct file_xchg_range {
  * commit is complete.
  *
  * This flag should not be combined with NONATOMIC.  It can be combined with
- * SKIP_FILE1_HOLES.
+ * FILE1_WRITTEN.
  */
-#define FILE_XCHG_RANGE_COMMIT		(FILE_XCHG_RANGE_FILE2_FRESH | \
-					 FILE_XCHG_RANGE_FSYNC)
+#define XFS_EXCH_RANGE_COMMIT		(XFS_EXCH_RANGE_FILE2_FRESH | \
+					 XFS_EXCH_RANGE_FSYNC)
 
-#define FILE_XCHG_RANGE_ALL_FLAGS	(FILE_XCHG_RANGE_NONATOMIC | \
-					 FILE_XCHG_RANGE_FILE2_FRESH | \
-					 FILE_XCHG_RANGE_FULL_FILES | \
-					 FILE_XCHG_RANGE_TO_EOF | \
-					 FILE_XCHG_RANGE_FSYNC | \
-					 FILE_XCHG_RANGE_DRY_RUN | \
-					 FILE_XCHG_RANGE_SKIP_FILE1_HOLES)
+#define XFS_EXCH_RANGE_ALL_FLAGS	(XFS_EXCH_RANGE_NONATOMIC | \
+					 XFS_EXCH_RANGE_FILE2_FRESH | \
+					 XFS_EXCH_RANGE_FULL_FILES | \
+					 XFS_EXCH_RANGE_TO_EOF | \
+					 XFS_EXCH_RANGE_FSYNC | \
+					 XFS_EXCH_RANGE_DRY_RUN | \
+					 XFS_EXCH_RANGE_FILE1_WRITTEN)
 
-#define FIEXCHANGE_RANGE	_IOWR('X', 129, struct file_xchg_range)
+#define XFS_IOC_EXCHANGE_RANGE	_IOWR('X', 129, struct xfs_exch_range)
 
 #endif /* _LINUX_FIEXCHANGE_H */
diff --git a/src/global.h b/src/global.h
index 49570ef117..4f92308d6c 100644
--- a/src/global.h
+++ b/src/global.h
@@ -171,9 +171,7 @@
 #include <sys/mman.h>
 #endif
 
-#ifdef HAVE_FIEXCHANGE
-# include <linux/fiexchange.h>
-#else
+#ifndef HAVE_XFS_IOC_EXCHANGE_RANGE
 # include "fiexchange.h"
 #endif
 
diff --git a/src/vfs/Makefile b/src/vfs/Makefile
index 4841da1286..868540f578 100644
--- a/src/vfs/Makefile
+++ b/src/vfs/Makefile
@@ -19,6 +19,10 @@ ifeq ($(HAVE_URING), true)
 LLDLIBS += -luring
 endif
 
+ifeq ($(HAVE_XFS_IOC_EXCHANGE_RANGE),yes)
+LCFLAGS += -DHAVE_XFS_IOC_EXCHANGE_RANGE
+endif
+
 default: depend $(TARGETS)
 
 depend: .dep
diff --git a/tests/generic/724 b/tests/generic/724
index 8d7dc4e12a..67e0dba446 100755
--- a/tests/generic/724
+++ b/tests/generic/724
@@ -5,7 +5,7 @@
 # FS QA Test No. 724
 #
 # Test scatter-gather atomic file writes.  We create a temporary file, write
-# sparsely to it, then use FILE_SWAP_RANGE_SKIP_FILE1_HOLES flag to swap
+# sparsely to it, then use XFS_EXCH_RANGE_FILE1_WRITTEN flag to swap
 # atomicallly only the ranges that we wrote.
 
 . ./common/preamble
diff --git a/tests/xfs/122.out b/tests/xfs/122.out
index 21549db7fd..89f7b735b0 100644
--- a/tests/xfs/122.out
+++ b/tests/xfs/122.out
@@ -90,6 +90,7 @@ sizeof(struct xfs_disk_dquot) = 104
 sizeof(struct xfs_dqblk) = 136
 sizeof(struct xfs_dsb) = 264
 sizeof(struct xfs_dsymlink_hdr) = 56
+sizeof(struct xfs_exch_range) = 120
 sizeof(struct xfs_extent_data) = 24
 sizeof(struct xfs_extent_data_info) = 32
 sizeof(struct xfs_fs_eofblocks) = 128
diff --git a/tests/xfs/791 b/tests/xfs/791
index d82314ee08..4944c1517c 100755
--- a/tests/xfs/791
+++ b/tests/xfs/791
@@ -5,7 +5,7 @@
 # FS QA Test No. 791
 #
 # Test scatter-gather atomic file writes.  We create a temporary file, write
-# sparsely to it, then use FILE_SWAP_RANGE_SKIP_FILE1_HOLES flag to swap
+# sparsely to it, then use XFS_EXCH_RANGE_FILE1_WRITTEN flag to swap
 # atomicallly only the ranges that we wrote.  Inject an error so that we can
 # test that log recovery finishes the swap.
 




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