diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index 6366c945ca7d..36baf9913b08 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -46,6 +46,7 @@ xfs-y				+= $(addprefix libxfs/, \
 				   xfs_refcount.o \
 				   xfs_refcount_btree.o \
 				   xfs_sb.o \
+				   xfs_swapext.o \
 				   xfs_symlink_remote.o \
 				   xfs_trans_inode.o \
 				   xfs_trans_resv.o \
diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h
index e35ddc9c0412..81be2b108ade 100644
--- a/fs/xfs/libxfs/xfs_bmap.h
+++ b/fs/xfs/libxfs/xfs_bmap.h
@@ -156,7 +156,7 @@ static inline bool xfs_bmap_is_real_extent(const struct xfs_bmbt_irec *irec)
  * Return true if the extent is a real, allocated extent, or false if it is  a
  * delayed allocation, and unwritten extent or a hole.
  */
-static inline bool xfs_bmap_is_written_extent(struct xfs_bmbt_irec *irec)
+static inline bool xfs_bmap_is_written_extent(const struct xfs_bmbt_irec *irec)
 {
 	return xfs_bmap_is_real_extent(irec) &&
 	       irec->br_state != XFS_EXT_UNWRITTEN;
diff --git a/fs/xfs/libxfs/xfs_defer.c b/fs/xfs/libxfs/xfs_defer.c
index bcfb6a4203cd..1619b9b928db 100644
--- a/fs/xfs/libxfs/xfs_defer.c
+++ b/fs/xfs/libxfs/xfs_defer.c
@@ -26,6 +26,7 @@
 #include "xfs_da_format.h"
 #include "xfs_da_btree.h"
 #include "xfs_attr.h"
+#include "xfs_swapext.h"
 
 static struct kmem_cache	*xfs_defer_pending_cache;
 
@@ -189,6 +190,7 @@ static const struct xfs_defer_op_type *defer_op_types[] = {
 	[XFS_DEFER_OPS_TYPE_FREE]	= &xfs_extent_free_defer_type,
 	[XFS_DEFER_OPS_TYPE_AGFL_FREE]	= &xfs_agfl_free_defer_type,
 	[XFS_DEFER_OPS_TYPE_ATTR]	= &xfs_attr_defer_type,
+	[XFS_DEFER_OPS_TYPE_SWAPEXT]	= &xfs_swapext_defer_type,
 };
 
 /*
@@ -913,6 +915,10 @@ xfs_defer_init_item_caches(void)
 	error = xfs_attr_intent_init_cache();
 	if (error)
 		goto err;
+	error = xfs_swapext_intent_init_cache();
+	if (error)
+		goto err;
+
 	return 0;
 err:
 	xfs_defer_destroy_item_caches();
@@ -923,6 +929,7 @@ xfs_defer_init_item_caches(void)
 void
 xfs_defer_destroy_item_caches(void)
 {
+	xfs_swapext_intent_destroy_cache();
 	xfs_attr_intent_destroy_cache();
 	xfs_extfree_intent_destroy_cache();
 	xfs_bmap_intent_destroy_cache();
diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
index 114a3a4930a3..bcc48b0c75c9 100644
--- a/fs/xfs/libxfs/xfs_defer.h
+++ b/fs/xfs/libxfs/xfs_defer.h
@@ -20,6 +20,7 @@ enum xfs_defer_ops_type {
 	XFS_DEFER_OPS_TYPE_FREE,
 	XFS_DEFER_OPS_TYPE_AGFL_FREE,
 	XFS_DEFER_OPS_TYPE_ATTR,
+	XFS_DEFER_OPS_TYPE_SWAPEXT,
 	XFS_DEFER_OPS_TYPE_MAX,
 };
 
@@ -65,7 +66,7 @@ extern const struct xfs_defer_op_type xfs_rmap_update_defer_type;
 extern const struct xfs_defer_op_type xfs_extent_free_defer_type;
 extern const struct xfs_defer_op_type xfs_agfl_free_defer_type;
 extern const struct xfs_defer_op_type xfs_attr_defer_type;
-
+extern const struct xfs_defer_op_type xfs_swapext_defer_type;
 
 /*
  * Deferred operation item relogging limits.
diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index 1424976ec955..bb8bff488017 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -425,6 +425,12 @@ static inline bool xfs_sb_version_haslogxattrs(struct xfs_sb *sbp)
 		 XFS_SB_FEAT_INCOMPAT_LOG_XATTRS);
 }
 
+static inline bool xfs_sb_version_haslogswapext(struct xfs_sb *sbp)
+{
+	return xfs_sb_is_v5(sbp) && (sbp->sb_features_log_incompat &
+		 XFS_SB_FEAT_INCOMPAT_LOG_SWAPEXT);
+}
+
 static inline bool
 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
 {
diff --git a/fs/xfs/libxfs/xfs_log_format.h b/fs/xfs/libxfs/xfs_log_format.h
index b105a5ef6644..171f72e41225 100644
--- a/fs/xfs/libxfs/xfs_log_format.h
+++ b/fs/xfs/libxfs/xfs_log_format.h
@@ -891,9 +891,36 @@ struct xfs_swap_extent {
 	int64_t			sx_isize2;
 };
 
-#define XFS_SWAP_EXT_FLAGS		(0)
+/* Swap extents between extended attribute forks. */
+#define XFS_SWAP_EXT_ATTR_FORK		(1ULL << 0)
 
-#define XFS_SWAP_EXT_STRINGS
+/* Set the file sizes when finished. */
+#define XFS_SWAP_EXT_SET_SIZES		(1ULL << 1)
+
+/*
+ * Swap only the extents of the two files where the file allocation units
+ * mapped to file1's range have been written to.
+ */
+#define XFS_SWAP_EXT_INO1_WRITTEN	(1ULL << 2)
+
+/* Clear the reflink flag from inode1 after the operation. */
+#define XFS_SWAP_EXT_CLEAR_INO1_REFLINK	(1ULL << 3)
+
+/* Clear the reflink flag from inode2 after the operation. */
+#define XFS_SWAP_EXT_CLEAR_INO2_REFLINK	(1ULL << 4)
+
+#define XFS_SWAP_EXT_FLAGS		(XFS_SWAP_EXT_ATTR_FORK | \
+					 XFS_SWAP_EXT_SET_SIZES | \
+					 XFS_SWAP_EXT_INO1_WRITTEN | \
+					 XFS_SWAP_EXT_CLEAR_INO1_REFLINK | \
+					 XFS_SWAP_EXT_CLEAR_INO2_REFLINK)
+
+#define XFS_SWAP_EXT_STRINGS \
+	{ XFS_SWAP_EXT_ATTR_FORK,		"ATTRFORK" }, \
+	{ XFS_SWAP_EXT_SET_SIZES,		"SETSIZES" }, \
+	{ XFS_SWAP_EXT_INO1_WRITTEN,		"INO1_WRITTEN" }, \
+	{ XFS_SWAP_EXT_CLEAR_INO1_REFLINK,	"CLEAR_INO1_REFLINK" }, \
+	{ XFS_SWAP_EXT_CLEAR_INO2_REFLINK,	"CLEAR_INO2_REFLINK" }
 
 /* This is the structure used to lay out an sxi log item in the log. */
 struct xfs_sxi_log_format {
diff --git a/fs/xfs/libxfs/xfs_swapext.c b/fs/xfs/libxfs/xfs_swapext.c
new file mode 100644
index 000000000000..671dd8365a02
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_swapext.c
@@ -0,0 +1,1040 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2020-2023 Oracle.  All Rights Reserved.
+ * Author: Darrick J. Wong <djwong@kernel.org>
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_defer.h"
+#include "xfs_inode.h"
+#include "xfs_trans.h"
+#include "xfs_bmap.h"
+#include "xfs_icache.h"
+#include "xfs_quota.h"
+#include "xfs_swapext.h"
+#include "xfs_trace.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_trans_space.h"
+#include "xfs_error.h"
+#include "xfs_errortag.h"
+#include "xfs_health.h"
+
+struct kmem_cache	*xfs_swapext_intent_cache;
+
+/* bmbt mappings adjacent to a pair of records. */
+struct xfs_swapext_adjacent {
+	struct xfs_bmbt_irec		left1;
+	struct xfs_bmbt_irec		right1;
+	struct xfs_bmbt_irec		left2;
+	struct xfs_bmbt_irec		right2;
+};
+
+#define ADJACENT_INIT { \
+	.left1  = { .br_startblock = HOLESTARTBLOCK }, \
+	.right1 = { .br_startblock = HOLESTARTBLOCK }, \
+	.left2  = { .br_startblock = HOLESTARTBLOCK }, \
+	.right2 = { .br_startblock = HOLESTARTBLOCK }, \
+}
+
+/* Information to help us reset reflink flag / CoW fork state after a swap. */
+
+/* Previous state of the two inodes' reflink flags. */
+#define XFS_REFLINK_STATE_IP1		(1U << 0)
+#define XFS_REFLINK_STATE_IP2		(1U << 1)
+
+/*
+ * If the reflink flag is set on either inode, make sure it has an incore CoW
+ * fork, since all reflink inodes must have them.  If there's a CoW fork and it
+ * has extents in it, make sure the inodes are tagged appropriately so that
+ * speculative preallocations can be GC'd if we run low of space.
+ */
+static inline void
+xfs_swapext_ensure_cowfork(
+	struct xfs_inode	*ip)
+{
+	struct xfs_ifork	*cfork;
+
+	if (xfs_is_reflink_inode(ip))
+		xfs_ifork_init_cow(ip);
+
+	cfork = xfs_ifork_ptr(ip, XFS_COW_FORK);
+	if (!cfork)
+		return;
+	if (cfork->if_bytes > 0)
+		xfs_inode_set_cowblocks_tag(ip);
+	else
+		xfs_inode_clear_cowblocks_tag(ip);
+}
+
+/* Schedule an atomic extent swap. */
+void
+xfs_swapext_schedule(
+	struct xfs_trans		*tp,
+	struct xfs_swapext_intent	*sxi)
+{
+	trace_xfs_swapext_defer(tp->t_mountp, sxi);
+	xfs_defer_add(tp, XFS_DEFER_OPS_TYPE_SWAPEXT, &sxi->sxi_list);
+}
+
+/*
+ * Adjust the on-disk inode size upwards if needed so that we never map extents
+ * into the file past EOF.  This is crucial so that log recovery won't get
+ * confused by the sudden appearance of post-eof extents.
+ */
+STATIC void
+xfs_swapext_update_size(
+	struct xfs_trans	*tp,
+	struct xfs_inode	*ip,
+	struct xfs_bmbt_irec	*imap,
+	xfs_fsize_t		new_isize)
+{
+	struct xfs_mount	*mp = tp->t_mountp;
+	xfs_fsize_t		len;
+
+	if (new_isize < 0)
+		return;
+
+	len = min(XFS_FSB_TO_B(mp, imap->br_startoff + imap->br_blockcount),
+		  new_isize);
+
+	if (len <= ip->i_disk_size)
+		return;
+
+	trace_xfs_swapext_update_inode_size(ip, len);
+
+	ip->i_disk_size = len;
+	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+}
+
+static inline bool
+sxi_has_more_swap_work(const struct xfs_swapext_intent *sxi)
+{
+	return sxi->sxi_blockcount > 0;
+}
+
+static inline bool
+sxi_has_postop_work(const struct xfs_swapext_intent *sxi)
+{
+	return sxi->sxi_flags & (XFS_SWAP_EXT_CLEAR_INO1_REFLINK |
+				 XFS_SWAP_EXT_CLEAR_INO2_REFLINK);
+}
+
+static inline void
+sxi_advance(
+	struct xfs_swapext_intent	*sxi,
+	const struct xfs_bmbt_irec	*irec)
+{
+	sxi->sxi_startoff1 += irec->br_blockcount;
+	sxi->sxi_startoff2 += irec->br_blockcount;
+	sxi->sxi_blockcount -= irec->br_blockcount;
+}
+
+/* Check all extents to make sure we can actually swap them. */
+int
+xfs_swapext_check_extents(
+	struct xfs_mount		*mp,
+	const struct xfs_swapext_req	*req)
+{
+	struct xfs_ifork		*ifp1, *ifp2;
+
+	/* No fork? */
+	ifp1 = xfs_ifork_ptr(req->ip1, req->whichfork);
+	ifp2 = xfs_ifork_ptr(req->ip2, req->whichfork);
+	if (!ifp1 || !ifp2)
+		return -EINVAL;
+
+	/* We don't know how to swap local format forks. */
+	if (ifp1->if_format == XFS_DINODE_FMT_LOCAL ||
+	    ifp2->if_format == XFS_DINODE_FMT_LOCAL)
+		return -EINVAL;
+
+	/* We don't support realtime data forks yet. */
+	if (!XFS_IS_REALTIME_INODE(req->ip1))
+		return 0;
+	if (req->whichfork == XFS_ATTR_FORK)
+		return 0;
+	return -EINVAL;
+}
+
+#ifdef CONFIG_XFS_QUOTA
+/* Log the actual updates to the quota accounting. */
+static inline void
+xfs_swapext_update_quota(
+	struct xfs_trans		*tp,
+	struct xfs_swapext_intent	*sxi,
+	struct xfs_bmbt_irec		*irec1,
+	struct xfs_bmbt_irec		*irec2)
+{
+	int64_t				ip1_delta = 0, ip2_delta = 0;
+	unsigned int			qflag;
+
+	qflag = XFS_IS_REALTIME_INODE(sxi->sxi_ip1) ? XFS_TRANS_DQ_RTBCOUNT :
+						      XFS_TRANS_DQ_BCOUNT;
+
+	if (xfs_bmap_is_real_extent(irec1)) {
+		ip1_delta -= irec1->br_blockcount;
+		ip2_delta += irec1->br_blockcount;
+	}
+
+	if (xfs_bmap_is_real_extent(irec2)) {
+		ip1_delta += irec2->br_blockcount;
+		ip2_delta -= irec2->br_blockcount;
+	}
+
+	xfs_trans_mod_dquot_byino(tp, sxi->sxi_ip1, qflag, ip1_delta);
+	xfs_trans_mod_dquot_byino(tp, sxi->sxi_ip2, qflag, ip2_delta);
+}
+#else
+# define xfs_swapext_update_quota(tp, sxi, irec1, irec2)	((void)0)
+#endif
+
+/* Decide if we want to skip this mapping from file1. */
+static inline bool
+xfs_swapext_can_skip_mapping(
+	struct xfs_swapext_intent	*sxi,
+	struct xfs_bmbt_irec		*irec)
+{
+	/* Do not skip this mapping if the caller did not tell us to. */
+	if (!(sxi->sxi_flags & XFS_SWAP_EXT_INO1_WRITTEN))
+		return false;
+
+	/* Do not skip mapped, written extents. */
+	if (xfs_bmap_is_written_extent(irec))
+		return false;
+
+	/*
+	 * The mapping is unwritten or a hole.  It cannot be a delalloc
+	 * reservation because we already excluded those.  It cannot be an
+	 * unwritten extent with dirty page cache because we flushed the page
+	 * cache.  We don't support realtime files yet, so we needn't (yet)
+	 * deal with them.
+	 */
+	return true;
+}
+
+/*
+ * Walk forward through the file ranges in @sxi until we find two different
+ * mappings to exchange.  If there is work to do, return the mappings;
+ * otherwise we've reached the end of the range and sxi_blockcount will be
+ * zero.
+ *
+ * If the walk skips over a pair of mappings to the same storage, save them as
+ * the left records in @adj (if provided) so that the simulation phase can
+ * avoid an extra lookup.
+  */
+static int
+xfs_swapext_find_mappings(
+	struct xfs_swapext_intent	*sxi,
+	struct xfs_bmbt_irec		*irec1,
+	struct xfs_bmbt_irec		*irec2,
+	struct xfs_swapext_adjacent	*adj)
+{
+	int				nimaps;
+	int				bmap_flags;
+	int				error;
+
+	bmap_flags = xfs_bmapi_aflag(xfs_swapext_whichfork(sxi));
+
+	for (; sxi_has_more_swap_work(sxi); sxi_advance(sxi, irec1)) {
+		/* Read extent from the first file */
+		nimaps = 1;
+		error = xfs_bmapi_read(sxi->sxi_ip1, sxi->sxi_startoff1,
+				sxi->sxi_blockcount, irec1, &nimaps,
+				bmap_flags);
+		if (error)
+			return error;
+		if (nimaps != 1 ||
+		    irec1->br_startblock == DELAYSTARTBLOCK ||
+		    irec1->br_startoff != sxi->sxi_startoff1) {
+			/*
+			 * We should never get no mapping or a delalloc extent
+			 * or something that doesn't match what we asked for,
+			 * since the caller flushed both inodes and we hold the
+			 * ILOCKs for both inodes.
+			 */
+			ASSERT(0);
+			return -EINVAL;
+		}
+
+		if (xfs_swapext_can_skip_mapping(sxi, irec1)) {
+			trace_xfs_swapext_extent1_skip(sxi->sxi_ip1, irec1);
+			continue;
+		}
+
+		/* Read extent from the second file */
+		nimaps = 1;
+		error = xfs_bmapi_read(sxi->sxi_ip2, sxi->sxi_startoff2,
+				irec1->br_blockcount, irec2, &nimaps,
+				bmap_flags);
+		if (error)
+			return error;
+		if (nimaps != 1 ||
+		    irec2->br_startblock == DELAYSTARTBLOCK ||
+		    irec2->br_startoff != sxi->sxi_startoff2) {
+			/*
+			 * We should never get no mapping or a delalloc extent
+			 * or something that doesn't match what we asked for,
+			 * since the caller flushed both inodes and we hold the
+			 * ILOCKs for both inodes.
+			 */
+			ASSERT(0);
+			return -EINVAL;
+		}
+
+		/*
+		 * We can only swap as many blocks as the smaller of the two
+		 * extent maps.
+		 */
+		irec1->br_blockcount = min(irec1->br_blockcount,
+					   irec2->br_blockcount);
+
+		trace_xfs_swapext_extent1(sxi->sxi_ip1, irec1);
+		trace_xfs_swapext_extent2(sxi->sxi_ip2, irec2);
+
+		/* We found something to swap, so return it. */
+		if (irec1->br_startblock != irec2->br_startblock)
+			return 0;
+
+		/*
+		 * Two extents mapped to the same physical block must not have
+		 * different states; that's filesystem corruption.  Move on to
+		 * the next extent if they're both holes or both the same
+		 * physical extent.
+		 */
+		if (irec1->br_state != irec2->br_state) {
+			xfs_bmap_mark_sick(sxi->sxi_ip1,
+					xfs_swapext_whichfork(sxi));
+			xfs_bmap_mark_sick(sxi->sxi_ip2,
+					xfs_swapext_whichfork(sxi));
+			return -EFSCORRUPTED;
+		}
+
+		/*
+		 * Save the mappings if we're estimating work and skipping
+		 * these identical mappings.
+		 */
+		if (adj) {
+			memcpy(&adj->left1, irec1, sizeof(*irec1));
+			memcpy(&adj->left2, irec2, sizeof(*irec2));
+		}
+	}
+
+	return 0;
+}
+
+/* Exchange these two mappings. */
+static void
+xfs_swapext_exchange_mappings(
+	struct xfs_trans		*tp,
+	struct xfs_swapext_intent	*sxi,
+	struct xfs_bmbt_irec		*irec1,
+	struct xfs_bmbt_irec		*irec2)
+{
+	int				whichfork = xfs_swapext_whichfork(sxi);
+
+	xfs_swapext_update_quota(tp, sxi, irec1, irec2);
+
+	/* Remove both mappings. */
+	xfs_bmap_unmap_extent(tp, sxi->sxi_ip1, whichfork, irec1);
+	xfs_bmap_unmap_extent(tp, sxi->sxi_ip2, whichfork, irec2);
+
+	/*
+	 * Re-add both mappings.  We swap the file offsets between the two maps
+	 * and add the opposite map, which has the effect of filling the
+	 * logical offsets we just unmapped, but with with the physical mapping
+	 * information swapped.
+	 */
+	swap(irec1->br_startoff, irec2->br_startoff);
+	xfs_bmap_map_extent(tp, sxi->sxi_ip1, whichfork, irec2);
+	xfs_bmap_map_extent(tp, sxi->sxi_ip2, whichfork, irec1);
+
+	/* Make sure we're not mapping extents past EOF. */
+	if (whichfork == XFS_DATA_FORK) {
+		xfs_swapext_update_size(tp, sxi->sxi_ip1, irec2,
+				sxi->sxi_isize1);
+		xfs_swapext_update_size(tp, sxi->sxi_ip2, irec1,
+				sxi->sxi_isize2);
+	}
+
+	/*
+	 * Advance our cursor and exit.   The caller (either defer ops or log
+	 * recovery) will log the SXD item, and if *blockcount is nonzero, it
+	 * will log a new SXI item for the remainder and call us back.
+	 */
+	sxi_advance(sxi, irec1);
+}
+
+static inline void
+xfs_swapext_clear_reflink(
+	struct xfs_trans	*tp,
+	struct xfs_inode	*ip)
+{
+	trace_xfs_reflink_unset_inode_flag(ip);
+
+	ip->i_diflags2 &= ~XFS_DIFLAG2_REFLINK;
+	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+}
+
+/* Finish whatever work might come after a swap operation. */
+static int
+xfs_swapext_do_postop_work(
+	struct xfs_trans		*tp,
+	struct xfs_swapext_intent	*sxi)
+{
+	if (sxi->sxi_flags & XFS_SWAP_EXT_CLEAR_INO1_REFLINK) {
+		xfs_swapext_clear_reflink(tp, sxi->sxi_ip1);
+		sxi->sxi_flags &= ~XFS_SWAP_EXT_CLEAR_INO1_REFLINK;
+	}
+
+	if (sxi->sxi_flags & XFS_SWAP_EXT_CLEAR_INO2_REFLINK) {
+		xfs_swapext_clear_reflink(tp, sxi->sxi_ip2);
+		sxi->sxi_flags &= ~XFS_SWAP_EXT_CLEAR_INO2_REFLINK;
+	}
+
+	return 0;
+}
+
+/* Finish one extent swap, possibly log more. */
+int
+xfs_swapext_finish_one(
+	struct xfs_trans		*tp,
+	struct xfs_swapext_intent	*sxi)
+{
+	struct xfs_bmbt_irec		irec1, irec2;
+	int				error;
+
+	if (sxi_has_more_swap_work(sxi)) {
+		/*
+		 * If the operation state says that some range of the files
+		 * have not yet been swapped, look for extents in that range to
+		 * swap.  If we find some extents, swap them.
+		 */
+		error = xfs_swapext_find_mappings(sxi, &irec1, &irec2, NULL);
+		if (error)
+			return error;
+
+		if (sxi_has_more_swap_work(sxi))
+			xfs_swapext_exchange_mappings(tp, sxi, &irec1, &irec2);
+
+		/*
+		 * If the caller asked us to exchange the file sizes after the
+		 * swap and either we just swapped the last extents in the
+		 * range or we didn't find anything to swap, update the ondisk
+		 * file sizes.
+		 */
+		if ((sxi->sxi_flags & XFS_SWAP_EXT_SET_SIZES) &&
+		    !sxi_has_more_swap_work(sxi)) {
+			sxi->sxi_ip1->i_disk_size = sxi->sxi_isize1;
+			sxi->sxi_ip2->i_disk_size = sxi->sxi_isize2;
+
+			xfs_trans_log_inode(tp, sxi->sxi_ip1, XFS_ILOG_CORE);
+			xfs_trans_log_inode(tp, sxi->sxi_ip2, XFS_ILOG_CORE);
+		}
+	} else if (sxi_has_postop_work(sxi)) {
+		/*
+		 * Now that we're finished with the swap operation, complete
+		 * the post-op cleanup work.
+		 */
+		error = xfs_swapext_do_postop_work(tp, sxi);
+		if (error)
+			return error;
+	}
+
+	/* If we still have work to do, ask for a new transaction. */
+	if (sxi_has_more_swap_work(sxi) || sxi_has_postop_work(sxi)) {
+		trace_xfs_swapext_defer(tp->t_mountp, sxi);
+		return -EAGAIN;
+	}
+
+	/*
+	 * If we reach here, we've finished all the swapping work and the post
+	 * operation work.  The last thing we need to do before returning to
+	 * the caller is to make sure that COW forks are set up correctly.
+	 */
+	if (!(sxi->sxi_flags & XFS_SWAP_EXT_ATTR_FORK)) {
+		xfs_swapext_ensure_cowfork(sxi->sxi_ip1);
+		xfs_swapext_ensure_cowfork(sxi->sxi_ip2);
+	}
+
+	return 0;
+}
+
+/*
+ * Compute the amount of bmbt blocks we should reserve for each file.  In the
+ * worst case, each exchange will fill a hole with a new mapping, which could
+ * result in a btree split every time we add a new leaf block.
+ */
+static inline uint64_t
+xfs_swapext_bmbt_blocks(
+	struct xfs_mount		*mp,
+	const struct xfs_swapext_req	*req)
+{
+	return howmany_64(req->nr_exchanges,
+					XFS_MAX_CONTIG_BMAPS_PER_BLOCK(mp)) *
+			XFS_EXTENTADD_SPACE_RES(mp, req->whichfork);
+}
+
+static inline uint64_t
+xfs_swapext_rmapbt_blocks(
+	struct xfs_mount		*mp,
+	const struct xfs_swapext_req	*req)
+{
+	if (!xfs_has_rmapbt(mp))
+		return 0;
+	if (XFS_IS_REALTIME_INODE(req->ip1))
+		return 0;
+
+	return howmany_64(req->nr_exchanges,
+					XFS_MAX_CONTIG_RMAPS_PER_BLOCK(mp)) *
+			XFS_RMAPADD_SPACE_RES(mp);
+}
+
+/* Estimate the bmbt and rmapbt overhead required to exchange extents. */
+static int
+xfs_swapext_estimate_overhead(
+	struct xfs_swapext_req	*req)
+{
+	struct xfs_mount	*mp = req->ip1->i_mount;
+	xfs_filblks_t		bmbt_blocks;
+	xfs_filblks_t		rmapbt_blocks;
+	xfs_filblks_t		resblks = req->resblks;
+
+	/*
+	 * Compute the number of bmbt and rmapbt blocks we might need to handle
+	 * the estimated number of exchanges.
+	 */
+	bmbt_blocks = xfs_swapext_bmbt_blocks(mp, req);
+	rmapbt_blocks = xfs_swapext_rmapbt_blocks(mp, req);
+
+	trace_xfs_swapext_overhead(mp, bmbt_blocks, rmapbt_blocks);
+
+	/* Make sure the change in file block count doesn't overflow. */
+	if (check_add_overflow(req->ip1_bcount, bmbt_blocks, &req->ip1_bcount))
+		return -EFBIG;
+	if (check_add_overflow(req->ip2_bcount, bmbt_blocks, &req->ip2_bcount))
+		return -EFBIG;
+
+	/*
+	 * Add together the number of blocks we need to handle btree growth,
+	 * then add it to the number of blocks we need to reserve to this
+	 * transaction.
+	 */
+	if (check_add_overflow(resblks, bmbt_blocks, &resblks))
+		return -ENOSPC;
+	if (check_add_overflow(resblks, bmbt_blocks, &resblks))
+		return -ENOSPC;
+	if (check_add_overflow(resblks, rmapbt_blocks, &resblks))
+		return -ENOSPC;
+	if (check_add_overflow(resblks, rmapbt_blocks, &resblks))
+		return -ENOSPC;
+
+	/* Can't actually reserve more than UINT_MAX blocks. */
+	if (req->resblks > UINT_MAX)
+		return -ENOSPC;
+
+	req->resblks = resblks;
+	trace_xfs_swapext_final_estimate(req);
+	return 0;
+}
+
+/* Decide if we can merge two real extents. */
+static inline bool
+can_merge(
+	const struct xfs_bmbt_irec	*b1,
+	const struct xfs_bmbt_irec	*b2)
+{
+	/* Don't merge holes. */
+	if (b1->br_startblock == HOLESTARTBLOCK ||
+	    b2->br_startblock == HOLESTARTBLOCK)
+		return false;
+
+	/* We don't merge holes. */
+	if (!xfs_bmap_is_real_extent(b1) || !xfs_bmap_is_real_extent(b2))
+		return false;
+
+	if (b1->br_startoff   + b1->br_blockcount == b2->br_startoff &&
+	    b1->br_startblock + b1->br_blockcount == b2->br_startblock &&
+	    b1->br_state			  == b2->br_state &&
+	    b1->br_blockcount + b2->br_blockcount <= XFS_MAX_BMBT_EXTLEN)
+		return true;
+
+	return false;
+}
+
+#define CLEFT_CONTIG	0x01
+#define CRIGHT_CONTIG	0x02
+#define CHOLE		0x04
+#define CBOTH_CONTIG	(CLEFT_CONTIG | CRIGHT_CONTIG)
+
+#define NLEFT_CONTIG	0x10
+#define NRIGHT_CONTIG	0x20
+#define NHOLE		0x40
+#define NBOTH_CONTIG	(NLEFT_CONTIG | NRIGHT_CONTIG)
+
+/* Estimate the effect of a single swap on extent count. */
+static inline int
+delta_nextents_step(
+	struct xfs_mount		*mp,
+	const struct xfs_bmbt_irec	*left,
+	const struct xfs_bmbt_irec	*curr,
+	const struct xfs_bmbt_irec	*new,
+	const struct xfs_bmbt_irec	*right)
+{
+	bool				lhole, rhole, chole, nhole;
+	unsigned int			state = 0;
+	int				ret = 0;
+
+	lhole = left->br_startblock == HOLESTARTBLOCK;
+	rhole = right->br_startblock == HOLESTARTBLOCK;
+	chole = curr->br_startblock == HOLESTARTBLOCK;
+	nhole = new->br_startblock == HOLESTARTBLOCK;
+
+	if (chole)
+		state |= CHOLE;
+	if (!lhole && !chole && can_merge(left, curr))
+		state |= CLEFT_CONTIG;
+	if (!rhole && !chole && can_merge(curr, right))
+		state |= CRIGHT_CONTIG;
+	if ((state & CBOTH_CONTIG) == CBOTH_CONTIG &&
+	    left->br_startblock + curr->br_startblock +
+					right->br_startblock > XFS_MAX_BMBT_EXTLEN)
+		state &= ~CRIGHT_CONTIG;
+
+	if (nhole)
+		state |= NHOLE;
+	if (!lhole && !nhole && can_merge(left, new))
+		state |= NLEFT_CONTIG;
+	if (!rhole && !nhole && can_merge(new, right))
+		state |= NRIGHT_CONTIG;
+	if ((state & NBOTH_CONTIG) == NBOTH_CONTIG &&
+	    left->br_startblock + new->br_startblock +
+					right->br_startblock > XFS_MAX_BMBT_EXTLEN)
+		state &= ~NRIGHT_CONTIG;
+
+	switch (state & (CLEFT_CONTIG | CRIGHT_CONTIG | CHOLE)) {
+	case CLEFT_CONTIG | CRIGHT_CONTIG:
+		/*
+		 * left/curr/right are the same extent, so deleting curr causes
+		 * 2 new extents to be created.
+		 */
+		ret += 2;
+		break;
+	case 0:
+		/*
+		 * curr is not contiguous with any extent, so we remove curr
+		 * completely
+		 */
+		ret--;
+		break;
+	case CHOLE:
+		/* hole, do nothing */
+		break;
+	case CLEFT_CONTIG:
+	case CRIGHT_CONTIG:
+		/* trim either left or right, no change */
+		break;
+	}
+
+	switch (state & (NLEFT_CONTIG | NRIGHT_CONTIG | NHOLE)) {
+	case NLEFT_CONTIG | NRIGHT_CONTIG:
+		/*
+		 * left/curr/right will become the same extent, so adding
+		 * curr causes the deletion of right.
+		 */
+		ret--;
+		break;
+	case 0:
+		/* new is not contiguous with any extent */
+		ret++;
+		break;
+	case NHOLE:
+		/* hole, do nothing. */
+		break;
+	case NLEFT_CONTIG:
+	case NRIGHT_CONTIG:
+		/* new is absorbed into left or right, no change */
+		break;
+	}
+
+	trace_xfs_swapext_delta_nextents_step(mp, left, curr, new, right, ret,
+			state);
+	return ret;
+}
+
+/* Make sure we don't overflow the extent counters. */
+static inline int
+ensure_delta_nextents(
+	struct xfs_swapext_req	*req,
+	struct xfs_inode	*ip,
+	int64_t			delta)
+{
+	struct xfs_mount	*mp = ip->i_mount;
+	struct xfs_ifork	*ifp = xfs_ifork_ptr(ip, req->whichfork);
+	xfs_extnum_t		max_extents;
+	bool			large_extcount;
+
+	if (delta < 0)
+		return 0;
+
+	if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_REDUCE_MAX_IEXTENTS)) {
+		if (ifp->if_nextents + delta > 10)
+			return -EFBIG;
+	}
+
+	if (req->req_flags & XFS_SWAP_REQ_NREXT64)
+		large_extcount = true;
+	else
+		large_extcount = xfs_inode_has_large_extent_counts(ip);
+
+	max_extents = xfs_iext_max_nextents(large_extcount, req->whichfork);
+	if (ifp->if_nextents + delta <= max_extents)
+		return 0;
+	if (large_extcount)
+		return -EFBIG;
+	if (!xfs_has_large_extent_counts(mp))
+		return -EFBIG;
+
+	max_extents = xfs_iext_max_nextents(true, req->whichfork);
+	if (ifp->if_nextents + delta > max_extents)
+		return -EFBIG;
+
+	req->req_flags |= XFS_SWAP_REQ_NREXT64;
+	return 0;
+}
+
+/* Find the next extent after irec. */
+static inline int
+get_next_ext(
+	struct xfs_inode		*ip,
+	int				bmap_flags,
+	const struct xfs_bmbt_irec	*irec,
+	struct xfs_bmbt_irec		*nrec)
+{
+	xfs_fileoff_t			off;
+	xfs_filblks_t			blockcount;
+	int				nimaps = 1;
+	int				error;
+
+	off = irec->br_startoff + irec->br_blockcount;
+	blockcount = XFS_MAX_FILEOFF - off;
+	error = xfs_bmapi_read(ip, off, blockcount, nrec, &nimaps, bmap_flags);
+	if (error)
+		return error;
+	if (nrec->br_startblock == DELAYSTARTBLOCK ||
+	    nrec->br_startoff != off) {
+		/*
+		 * If we don't get the extent we want, return a zero-length
+		 * mapping, which our estimator function will pretend is a hole.
+		 * We shouldn't get delalloc reservations.
+		 */
+		nrec->br_startblock = HOLESTARTBLOCK;
+	}
+
+	return 0;
+}
+
+int __init
+xfs_swapext_intent_init_cache(void)
+{
+	xfs_swapext_intent_cache = kmem_cache_create("xfs_swapext_intent",
+			sizeof(struct xfs_swapext_intent),
+			0, 0, NULL);
+
+	return xfs_swapext_intent_cache != NULL ? 0 : -ENOMEM;
+}
+
+void
+xfs_swapext_intent_destroy_cache(void)
+{
+	kmem_cache_destroy(xfs_swapext_intent_cache);
+	xfs_swapext_intent_cache = NULL;
+}
+
+/*
+ * Decide if we will swap the reflink flags between the two files after the
+ * swap.  The only time we want to do this is if we're exchanging all extents
+ * under EOF and the inode reflink flags have different states.
+ */
+static inline bool
+sxi_can_exchange_reflink_flags(
+	const struct xfs_swapext_req	*req,
+	unsigned int			reflink_state)
+{
+	struct xfs_mount		*mp = req->ip1->i_mount;
+
+	if (hweight32(reflink_state) != 1)
+		return false;
+	if (req->startoff1 != 0 || req->startoff2 != 0)
+		return false;
+	if (req->blockcount != XFS_B_TO_FSB(mp, req->ip1->i_disk_size))
+		return false;
+	if (req->blockcount != XFS_B_TO_FSB(mp, req->ip2->i_disk_size))
+		return false;
+	return true;
+}
+
+
+/* Allocate and initialize a new incore intent item from a request. */
+struct xfs_swapext_intent *
+xfs_swapext_init_intent(
+	const struct xfs_swapext_req	*req,
+	unsigned int			*reflink_state)
+{
+	struct xfs_swapext_intent	*sxi;
+	unsigned int			rs = 0;
+
+	sxi = kmem_cache_zalloc(xfs_swapext_intent_cache,
+			GFP_NOFS | __GFP_NOFAIL);
+	INIT_LIST_HEAD(&sxi->sxi_list);
+	sxi->sxi_ip1 = req->ip1;
+	sxi->sxi_ip2 = req->ip2;
+	sxi->sxi_startoff1 = req->startoff1;
+	sxi->sxi_startoff2 = req->startoff2;
+	sxi->sxi_blockcount = req->blockcount;
+	sxi->sxi_isize1 = sxi->sxi_isize2 = -1;
+
+	if (req->whichfork == XFS_ATTR_FORK)
+		sxi->sxi_flags |= XFS_SWAP_EXT_ATTR_FORK;
+
+	if (req->whichfork == XFS_DATA_FORK &&
+	    (req->req_flags & XFS_SWAP_REQ_SET_SIZES)) {
+		sxi->sxi_flags |= XFS_SWAP_EXT_SET_SIZES;
+		sxi->sxi_isize1 = req->ip2->i_disk_size;
+		sxi->sxi_isize2 = req->ip1->i_disk_size;
+	}
+
+	if (req->req_flags & XFS_SWAP_REQ_INO1_WRITTEN)
+		sxi->sxi_flags |= XFS_SWAP_EXT_INO1_WRITTEN;
+
+	if (req->req_flags & XFS_SWAP_REQ_LOGGED)
+		sxi->sxi_op_flags |= XFS_SWAP_EXT_OP_LOGGED;
+	if (req->req_flags & XFS_SWAP_REQ_NREXT64)
+		sxi->sxi_op_flags |= XFS_SWAP_EXT_OP_NREXT64;
+
+	if (req->whichfork == XFS_DATA_FORK) {
+		/*
+		 * Record the state of each inode's reflink flag before the
+		 * operation.
+		 */
+		if (xfs_is_reflink_inode(req->ip1))
+			rs |= XFS_REFLINK_STATE_IP1;
+		if (xfs_is_reflink_inode(req->ip2))
+			rs |= XFS_REFLINK_STATE_IP2;
+
+		/*
+		 * Figure out if we're clearing the reflink flags (which
+		 * effectively swaps them) after the operation.
+		 */
+		if (sxi_can_exchange_reflink_flags(req, rs)) {
+			if (rs & XFS_REFLINK_STATE_IP1)
+				sxi->sxi_flags |=
+						XFS_SWAP_EXT_CLEAR_INO1_REFLINK;
+			if (rs & XFS_REFLINK_STATE_IP2)
+				sxi->sxi_flags |=
+						XFS_SWAP_EXT_CLEAR_INO2_REFLINK;
+		}
+	}
+
+	if (reflink_state)
+		*reflink_state = rs;
+	return sxi;
+}
+
+/*
+ * Estimate the number of exchange operations and the number of file blocks
+ * in each file that will be affected by the exchange operation.
+ */
+int
+xfs_swapext_estimate(
+	struct xfs_swapext_req		*req)
+{
+	struct xfs_swapext_intent	*sxi;
+	struct xfs_bmbt_irec		irec1, irec2;
+	struct xfs_swapext_adjacent	adj = ADJACENT_INIT;
+	xfs_filblks_t			ip1_blocks = 0, ip2_blocks = 0;
+	int64_t				d_nexts1, d_nexts2;
+	int				bmap_flags;
+	int				error;
+
+	ASSERT(!(req->req_flags & ~XFS_SWAP_REQ_FLAGS));
+
+	bmap_flags = xfs_bmapi_aflag(req->whichfork);
+	sxi = xfs_swapext_init_intent(req, NULL);
+
+	/*
+	 * To guard against the possibility of overflowing the extent counters,
+	 * we have to estimate an upper bound on the potential increase in that
+	 * counter.  We can split the extent at each end of the range, and for
+	 * each step of the swap we can split the extent that we're working on
+	 * if the extents do not align.
+	 */
+	d_nexts1 = d_nexts2 = 3;
+
+	while (sxi_has_more_swap_work(sxi)) {
+		/*
+		 * Walk through the file ranges until we find something to
+		 * swap.  Because we're simulating the swap, pass in adj to
+		 * capture skipped mappings for correct estimation of bmbt
+		 * record merges.
+		 */
+		error = xfs_swapext_find_mappings(sxi, &irec1, &irec2, &adj);
+		if (error)
+			goto out_free;
+		if (!sxi_has_more_swap_work(sxi))
+			break;
+
+		/* Update accounting. */
+		if (xfs_bmap_is_real_extent(&irec1))
+			ip1_blocks += irec1.br_blockcount;
+		if (xfs_bmap_is_real_extent(&irec2))
+			ip2_blocks += irec2.br_blockcount;
+		req->nr_exchanges++;
+
+		/* Read the next extents from both files. */
+		error = get_next_ext(req->ip1, bmap_flags, &irec1, &adj.right1);
+		if (error)
+			goto out_free;
+
+		error = get_next_ext(req->ip2, bmap_flags, &irec2, &adj.right2);
+		if (error)
+			goto out_free;
+
+		/* Update extent count deltas. */
+		d_nexts1 += delta_nextents_step(req->ip1->i_mount,
+				&adj.left1, &irec1, &irec2, &adj.right1);
+
+		d_nexts2 += delta_nextents_step(req->ip1->i_mount,
+				&adj.left2, &irec2, &irec1, &adj.right2);
+
+		/* Now pretend we swapped the extents. */
+		if (can_merge(&adj.left2, &irec1))
+			adj.left2.br_blockcount += irec1.br_blockcount;
+		else
+			memcpy(&adj.left2, &irec1, sizeof(irec1));
+
+		if (can_merge(&adj.left1, &irec2))
+			adj.left1.br_blockcount += irec2.br_blockcount;
+		else
+			memcpy(&adj.left1, &irec2, sizeof(irec2));
+
+		sxi_advance(sxi, &irec1);
+	}
+
+	/* Account for the blocks that are being exchanged. */
+	if (XFS_IS_REALTIME_INODE(req->ip1) &&
+	    req->whichfork == XFS_DATA_FORK) {
+		req->ip1_rtbcount = ip1_blocks;
+		req->ip2_rtbcount = ip2_blocks;
+	} else {
+		req->ip1_bcount = ip1_blocks;
+		req->ip2_bcount = ip2_blocks;
+	}
+
+	/*
+	 * Make sure that both forks have enough slack left in their extent
+	 * counters that the swap operation will not overflow.
+	 */
+	trace_xfs_swapext_delta_nextents(req, d_nexts1, d_nexts2);
+	if (req->ip1 == req->ip2) {
+		error = ensure_delta_nextents(req, req->ip1,
+				d_nexts1 + d_nexts2);
+	} else {
+		error = ensure_delta_nextents(req, req->ip1, d_nexts1);
+		if (error)
+			goto out_free;
+		error = ensure_delta_nextents(req, req->ip2, d_nexts2);
+	}
+	if (error)
+		goto out_free;
+
+	trace_xfs_swapext_initial_estimate(req);
+	error = xfs_swapext_estimate_overhead(req);
+out_free:
+	kmem_cache_free(xfs_swapext_intent_cache, sxi);
+	return error;
+}
+
+static inline void
+xfs_swapext_set_reflink(
+	struct xfs_trans	*tp,
+	struct xfs_inode	*ip)
+{
+	trace_xfs_reflink_set_inode_flag(ip);
+
+	ip->i_diflags2 |= XFS_DIFLAG2_REFLINK;
+	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+}
+
+/*
+ * If either file has shared blocks and we're swapping data forks, we must flag
+ * the other file as having shared blocks so that we get the shared-block rmap
+ * functions if we need to fix up the rmaps.
+ */
+void
+xfs_swapext_ensure_reflink(
+	struct xfs_trans		*tp,
+	const struct xfs_swapext_intent	*sxi,
+	unsigned int			reflink_state)
+{
+	if ((reflink_state & XFS_REFLINK_STATE_IP1) &&
+	    !xfs_is_reflink_inode(sxi->sxi_ip2))
+		xfs_swapext_set_reflink(tp, sxi->sxi_ip2);
+
+	if ((reflink_state & XFS_REFLINK_STATE_IP2) &&
+	    !xfs_is_reflink_inode(sxi->sxi_ip1))
+		xfs_swapext_set_reflink(tp, sxi->sxi_ip1);
+}
+
+/* Widen the extent counts of both inodes if necessary. */
+static inline void
+xfs_swapext_upgrade_extent_counts(
+	struct xfs_trans		*tp,
+	const struct xfs_swapext_intent	*sxi)
+{
+	if (!(sxi->sxi_op_flags & XFS_SWAP_EXT_OP_NREXT64))
+		return;
+
+	sxi->sxi_ip1->i_diflags2 |= XFS_DIFLAG2_NREXT64;
+	xfs_trans_log_inode(tp, sxi->sxi_ip1, XFS_ILOG_CORE);
+
+	sxi->sxi_ip2->i_diflags2 |= XFS_DIFLAG2_NREXT64;
+	xfs_trans_log_inode(tp, sxi->sxi_ip2, XFS_ILOG_CORE);
+}
+
+/*
+ * Schedule a swap a range of extents from one inode to another.  If the atomic
+ * swap feature is enabled, then the operation progress can be resumed even if
+ * the system goes down.  The caller must commit the transaction to start the
+ * work.
+ *
+ * The caller must ensure the inodes must be joined to the transaction and
+ * ILOCKd; they will still be joined to the transaction at exit.
+ */
+void
+xfs_swapext(
+	struct xfs_trans		*tp,
+	const struct xfs_swapext_req	*req)
+{
+	struct xfs_swapext_intent	*sxi;
+	unsigned int			reflink_state;
+
+	ASSERT(xfs_isilocked(req->ip1, XFS_ILOCK_EXCL));
+	ASSERT(xfs_isilocked(req->ip2, XFS_ILOCK_EXCL));
+	ASSERT(req->whichfork != XFS_COW_FORK);
+	ASSERT(!(req->req_flags & ~XFS_SWAP_REQ_FLAGS));
+	if (req->req_flags & XFS_SWAP_REQ_SET_SIZES)
+		ASSERT(req->whichfork == XFS_DATA_FORK);
+
+	if (req->blockcount == 0)
+		return;
+
+	sxi = xfs_swapext_init_intent(req, &reflink_state);
+	xfs_swapext_schedule(tp, sxi);
+	xfs_swapext_ensure_reflink(tp, sxi, reflink_state);
+	xfs_swapext_upgrade_extent_counts(tp, sxi);
+}
diff --git a/fs/xfs/libxfs/xfs_swapext.h b/fs/xfs/libxfs/xfs_swapext.h
index 6d17657cf1f6..7aa499537fd8 100644
--- a/fs/xfs/libxfs/xfs_swapext.h
+++ b/fs/xfs/libxfs/xfs_swapext.h
@@ -21,4 +21,149 @@ static inline bool xfs_swapext_supported(struct xfs_mount *mp)
 	       !xfs_has_realtime(mp);
 }
 
+/*
+ * In-core information about an extent swap request between ranges of two
+ * inodes.
+ */
+struct xfs_swapext_intent {
+	/* List of other incore deferred work. */
+	struct list_head	sxi_list;
+
+	/* Inodes participating in the operation. */
+	struct xfs_inode	*sxi_ip1;
+	struct xfs_inode	*sxi_ip2;
+
+	/* File offset range information. */
+	xfs_fileoff_t		sxi_startoff1;
+	xfs_fileoff_t		sxi_startoff2;
+	xfs_filblks_t		sxi_blockcount;
+
+	/* Set these file sizes after the operation, unless negative. */
+	xfs_fsize_t		sxi_isize1;
+	xfs_fsize_t		sxi_isize2;
+
+	/* XFS_SWAP_EXT_* log operation flags */
+	unsigned int		sxi_flags;
+
+	/* XFS_SWAP_EXT_OP_* flags */
+	unsigned int		sxi_op_flags;
+};
+
+/* Use log intent items to track and restart the entire operation. */
+#define XFS_SWAP_EXT_OP_LOGGED	(1U << 0)
+
+/* Upgrade files to have large extent counts before proceeding. */
+#define XFS_SWAP_EXT_OP_NREXT64	(1U << 1)
+
+#define XFS_SWAP_EXT_OP_STRINGS \
+	{ XFS_SWAP_EXT_OP_LOGGED,		"LOGGED" }, \
+	{ XFS_SWAP_EXT_OP_NREXT64,		"NREXT64" }
+
+static inline int
+xfs_swapext_whichfork(const struct xfs_swapext_intent *sxi)
+{
+	if (sxi->sxi_flags & XFS_SWAP_EXT_ATTR_FORK)
+		return XFS_ATTR_FORK;
+	return XFS_DATA_FORK;
+}
+
+/* Parameters for a swapext request. */
+struct xfs_swapext_req {
+	/* Inodes participating in the operation. */
+	struct xfs_inode	*ip1;
+	struct xfs_inode	*ip2;
+
+	/* File offset range information. */
+	xfs_fileoff_t		startoff1;
+	xfs_fileoff_t		startoff2;
+	xfs_filblks_t		blockcount;
+
+	/* Data or attr fork? */
+	int			whichfork;
+
+	/* XFS_SWAP_REQ_* operation flags */
+	unsigned int		req_flags;
+
+	/*
+	 * Fields below this line are filled out by xfs_swapext_estimate;
+	 * callers should initialize this part of the struct to zero.
+	 */
+
+	/*
+	 * Data device blocks to be moved out of ip1, and free space needed to
+	 * handle the bmbt changes.
+	 */
+	xfs_filblks_t		ip1_bcount;
+
+	/*
+	 * Data device blocks to be moved out of ip2, and free space needed to
+	 * handle the bmbt changes.
+	 */
+	xfs_filblks_t		ip2_bcount;
+
+	/* rt blocks to be moved out of ip1. */
+	xfs_filblks_t		ip1_rtbcount;
+
+	/* rt blocks to be moved out of ip2. */
+	xfs_filblks_t		ip2_rtbcount;
+
+	/* Free space needed to handle the bmbt changes */
+	unsigned long long	resblks;
+
+	/* Number of extent swaps needed to complete the operation */
+	unsigned long long	nr_exchanges;
+};
+
+/* Caller has permission to use log intent items for the swapext operation. */
+#define XFS_SWAP_REQ_LOGGED		(1U << 0)
+
+/* Set the file sizes when finished. */
+#define XFS_SWAP_REQ_SET_SIZES		(1U << 1)
+
+/*
+ * Swap only the parts of the two files where the file allocation units
+ * mapped to file1's range have been written to.
+ */
+#define XFS_SWAP_REQ_INO1_WRITTEN	(1U << 2)
+
+/* Files need to be upgraded to have large extent counts. */
+#define XFS_SWAP_REQ_NREXT64		(1U << 3)
+
+#define XFS_SWAP_REQ_FLAGS		(XFS_SWAP_REQ_LOGGED | \
+					 XFS_SWAP_REQ_SET_SIZES | \
+					 XFS_SWAP_REQ_INO1_WRITTEN | \
+					 XFS_SWAP_REQ_NREXT64)
+
+#define XFS_SWAP_REQ_STRINGS \
+	{ XFS_SWAP_REQ_LOGGED,		"LOGGED" }, \
+	{ XFS_SWAP_REQ_SET_SIZES,	"SETSIZES" }, \
+	{ XFS_SWAP_REQ_INO1_WRITTEN,	"INO1_WRITTEN" }, \
+	{ XFS_SWAP_REQ_NREXT64,		"NREXT64" }
+
+unsigned int xfs_swapext_reflink_prep(const struct xfs_swapext_req *req);
+void xfs_swapext_reflink_finish(struct xfs_trans *tp,
+		const struct xfs_swapext_req *req, unsigned int reflink_state);
+
+int xfs_swapext_estimate(struct xfs_swapext_req *req);
+
+extern struct kmem_cache	*xfs_swapext_intent_cache;
+
+int __init xfs_swapext_intent_init_cache(void);
+void xfs_swapext_intent_destroy_cache(void);
+
+struct xfs_swapext_intent *xfs_swapext_init_intent(
+		const struct xfs_swapext_req *req, unsigned int *reflink_state);
+void xfs_swapext_ensure_reflink(struct xfs_trans *tp,
+		const struct xfs_swapext_intent *sxi, unsigned int reflink_state);
+
+void xfs_swapext_schedule(struct xfs_trans *tp,
+		struct xfs_swapext_intent *sxi);
+int xfs_swapext_finish_one(struct xfs_trans *tp,
+		struct xfs_swapext_intent *sxi);
+
+int xfs_swapext_check_extents(struct xfs_mount *mp,
+		const struct xfs_swapext_req *req);
+
+void xfs_swapext(struct xfs_trans *tp, const struct xfs_swapext_req *req);
+
 #endif /* __XFS_SWAPEXT_H_ */
diff --git a/fs/xfs/libxfs/xfs_trans_space.h b/fs/xfs/libxfs/xfs_trans_space.h
index 87b31c69a773..9640fc232c14 100644
--- a/fs/xfs/libxfs/xfs_trans_space.h
+++ b/fs/xfs/libxfs/xfs_trans_space.h
@@ -10,6 +10,10 @@
  * Components of space reservations.
  */
 
+/* Worst case number of bmaps that can be held in a block. */
+#define XFS_MAX_CONTIG_BMAPS_PER_BLOCK(mp)    \
+		(((mp)->m_bmap_dmxr[0]) - ((mp)->m_bmap_dmnr[0]))
+
 /* Worst case number of rmaps that can be held in a block. */
 #define XFS_MAX_CONTIG_RMAPS_PER_BLOCK(mp)    \
 		(((mp)->m_rmap_mxr[0]) - ((mp)->m_rmap_mnr[0]))
diff --git a/fs/xfs/xfs_swapext_item.c b/fs/xfs/xfs_swapext_item.c
index 87d1be73bbf9..e6faca45fc12 100644
--- a/fs/xfs/xfs_swapext_item.c
+++ b/fs/xfs/xfs_swapext_item.c
@@ -16,13 +16,17 @@
 #include "xfs_trans.h"
 #include "xfs_trans_priv.h"
 #include "xfs_swapext_item.h"
+#include "xfs_swapext.h"
 #include "xfs_log.h"
 #include "xfs_bmap.h"
 #include "xfs_icache.h"
+#include "xfs_bmap_btree.h"
 #include "xfs_trans_space.h"
 #include "xfs_error.h"
 #include "xfs_log_priv.h"
 #include "xfs_log_recover.h"
+#include "xfs_xchgrange.h"
+#include "xfs_trace.h"
 
 struct kmem_cache	*xfs_sxi_cache;
 struct kmem_cache	*xfs_sxd_cache;
@@ -144,13 +148,395 @@ static inline struct xfs_sxd_log_item *SXD_ITEM(struct xfs_log_item *lip)
 	return container_of(lip, struct xfs_sxd_log_item, sxd_item);
 }
 
+STATIC void
+xfs_sxd_item_size(
+	struct xfs_log_item	*lip,
+	int			*nvecs,
+	int			*nbytes)
+{
+	*nvecs += 1;
+	*nbytes += sizeof(struct xfs_sxd_log_format);
+}
+
+/*
+ * This is called to fill in the vector of log iovecs for the given sxd log
+ * item. We use only 1 iovec, and we point that at the sxd_log_format structure
+ * embedded in the sxd item.
+ */
+STATIC void
+xfs_sxd_item_format(
+	struct xfs_log_item	*lip,
+	struct xfs_log_vec	*lv)
+{
+	struct xfs_sxd_log_item	*sxd_lip = SXD_ITEM(lip);
+	struct xfs_log_iovec	*vecp = NULL;
+
+	sxd_lip->sxd_format.sxd_type = XFS_LI_SXD;
+	sxd_lip->sxd_format.sxd_size = 1;
+
+	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_SXD_FORMAT, &sxd_lip->sxd_format,
+			sizeof(struct xfs_sxd_log_format));
+}
+
+/*
+ * The SXD is either committed or aborted if the transaction is cancelled. If
+ * the transaction is cancelled, drop our reference to the SXI and free the
+ * SXD.
+ */
+STATIC void
+xfs_sxd_item_release(
+	struct xfs_log_item	*lip)
+{
+	struct xfs_sxd_log_item	*sxd_lip = SXD_ITEM(lip);
+
+	kmem_free(sxd_lip->sxd_item.li_lv_shadow);
+	xfs_sxi_release(sxd_lip->sxd_intent_log_item);
+	kmem_cache_free(xfs_sxd_cache, sxd_lip);
+}
+
+static struct xfs_log_item *
+xfs_sxd_item_intent(
+	struct xfs_log_item	*lip)
+{
+	return &SXD_ITEM(lip)->sxd_intent_log_item->sxi_item;
+}
+
+static const struct xfs_item_ops xfs_sxd_item_ops = {
+	.flags		= XFS_ITEM_RELEASE_WHEN_COMMITTED |
+			  XFS_ITEM_INTENT_DONE,
+	.iop_size	= xfs_sxd_item_size,
+	.iop_format	= xfs_sxd_item_format,
+	.iop_release	= xfs_sxd_item_release,
+	.iop_intent	= xfs_sxd_item_intent,
+};
+
+static struct xfs_sxd_log_item *
+xfs_trans_get_sxd(
+	struct xfs_trans		*tp,
+	struct xfs_sxi_log_item		*sxi_lip)
+{
+	struct xfs_sxd_log_item		*sxd_lip;
+
+	sxd_lip = kmem_cache_zalloc(xfs_sxd_cache, GFP_KERNEL | __GFP_NOFAIL);
+	xfs_log_item_init(tp->t_mountp, &sxd_lip->sxd_item, XFS_LI_SXD,
+			  &xfs_sxd_item_ops);
+	sxd_lip->sxd_intent_log_item = sxi_lip;
+	sxd_lip->sxd_format.sxd_sxi_id = sxi_lip->sxi_format.sxi_id;
+
+	xfs_trans_add_item(tp, &sxd_lip->sxd_item);
+	return sxd_lip;
+}
+
+/*
+ * Finish an swapext update and log it to the SXD. Note that the transaction is
+ * marked dirty regardless of whether the swapext update succeeds or fails to
+ * support the SXI/SXD lifecycle rules.
+ */
+static int
+xfs_swapext_finish_update(
+	struct xfs_trans		*tp,
+	struct xfs_log_item		*done,
+	struct xfs_swapext_intent	*sxi)
+{
+	int				error;
+
+	error = xfs_swapext_finish_one(tp, sxi);
+
+	/*
+	 * Mark the transaction dirty, even on error. This ensures the
+	 * transaction is aborted, which:
+	 *
+	 * 1.) releases the SXI and frees the SXD
+	 * 2.) shuts down the filesystem
+	 */
+	tp->t_flags |= XFS_TRANS_DIRTY;
+	if (done)
+		set_bit(XFS_LI_DIRTY, &done->li_flags);
+
+	return error;
+}
+
+/* Log swapext updates in the intent item. */
+STATIC struct xfs_log_item *
+xfs_swapext_create_intent(
+	struct xfs_trans		*tp,
+	struct list_head		*items,
+	unsigned int			count,
+	bool				sort)
+{
+	struct xfs_sxi_log_item		*sxi_lip;
+	struct xfs_swapext_intent	*sxi;
+	struct xfs_swap_extent		*sx;
+
+	ASSERT(count == 1);
+
+	sxi = list_first_entry_or_null(items, struct xfs_swapext_intent,
+			sxi_list);
+
+	/*
+	 * We use the same defer ops control machinery to perform extent swaps
+	 * even if we aren't using the machinery to track the operation status
+	 * through log items.
+	 */
+	if (!(sxi->sxi_op_flags & XFS_SWAP_EXT_OP_LOGGED))
+		return NULL;
+
+	sxi_lip = xfs_sxi_init(tp->t_mountp);
+	xfs_trans_add_item(tp, &sxi_lip->sxi_item);
+	tp->t_flags |= XFS_TRANS_DIRTY;
+	set_bit(XFS_LI_DIRTY, &sxi_lip->sxi_item.li_flags);
+
+	sx = &sxi_lip->sxi_format.sxi_extent;
+	sx->sx_inode1 = sxi->sxi_ip1->i_ino;
+	sx->sx_inode2 = sxi->sxi_ip2->i_ino;
+	sx->sx_startoff1 = sxi->sxi_startoff1;
+	sx->sx_startoff2 = sxi->sxi_startoff2;
+	sx->sx_blockcount = sxi->sxi_blockcount;
+	sx->sx_isize1 = sxi->sxi_isize1;
+	sx->sx_isize2 = sxi->sxi_isize2;
+	sx->sx_flags = sxi->sxi_flags;
+
+	return &sxi_lip->sxi_item;
+}
+
+STATIC struct xfs_log_item *
+xfs_swapext_create_done(
+	struct xfs_trans		*tp,
+	struct xfs_log_item		*intent,
+	unsigned int			count)
+{
+	if (intent == NULL)
+		return NULL;
+	return &xfs_trans_get_sxd(tp, SXI_ITEM(intent))->sxd_item;
+}
+
+/* Process a deferred swapext update. */
+STATIC int
+xfs_swapext_finish_item(
+	struct xfs_trans		*tp,
+	struct xfs_log_item		*done,
+	struct list_head		*item,
+	struct xfs_btree_cur		**state)
+{
+	struct xfs_swapext_intent	*sxi;
+	int				error;
+
+	sxi = container_of(item, struct xfs_swapext_intent, sxi_list);
+
+	/*
+	 * Swap one more extent between the two files.  If there's still more
+	 * work to do, we want to requeue ourselves after all other pending
+	 * deferred operations have finished.  This includes all of the dfops
+	 * that we queued directly as well as any new ones created in the
+	 * process of finishing the others.  Doing so prevents us from queuing
+	 * a large number of SXI log items in kernel memory, which in turn
+	 * prevents us from pinning the tail of the log (while logging those
+	 * new SXI items) until the first SXI items can be processed.
+	 */
+	error = xfs_swapext_finish_update(tp, done, sxi);
+	if (error == -EAGAIN)
+		return error;
+
+	kmem_cache_free(xfs_swapext_intent_cache, sxi);
+	return error;
+}
+
+/* Abort all pending SXIs. */
+STATIC void
+xfs_swapext_abort_intent(
+	struct xfs_log_item		*intent)
+{
+	xfs_sxi_release(SXI_ITEM(intent));
+}
+
+/* Cancel a deferred swapext update. */
+STATIC void
+xfs_swapext_cancel_item(
+	struct list_head		*item)
+{
+	struct xfs_swapext_intent	*sxi;
+
+	sxi = container_of(item, struct xfs_swapext_intent, sxi_list);
+	kmem_cache_free(xfs_swapext_intent_cache, sxi);
+}
+
+const struct xfs_defer_op_type xfs_swapext_defer_type = {
+	.max_items	= 1,
+	.create_intent	= xfs_swapext_create_intent,
+	.abort_intent	= xfs_swapext_abort_intent,
+	.create_done	= xfs_swapext_create_done,
+	.finish_item	= xfs_swapext_finish_item,
+	.cancel_item	= xfs_swapext_cancel_item,
+};
+
+/* Is this recovered SXI ok? */
+static inline bool
+xfs_sxi_validate(
+	struct xfs_mount		*mp,
+	struct xfs_sxi_log_item		*sxi_lip)
+{
+	struct xfs_swap_extent		*sx = &sxi_lip->sxi_format.sxi_extent;
+
+	if (!xfs_sb_version_haslogswapext(&mp->m_sb))
+		return false;
+
+	if (sxi_lip->sxi_format.__pad != 0)
+		return false;
+
+	if (sx->sx_flags & ~XFS_SWAP_EXT_FLAGS)
+		return false;
+
+	if (!xfs_verify_ino(mp, sx->sx_inode1) ||
+	    !xfs_verify_ino(mp, sx->sx_inode2))
+		return false;
+
+	if ((sx->sx_flags & XFS_SWAP_EXT_SET_SIZES) &&
+	     (sx->sx_isize1 < 0 || sx->sx_isize2 < 0))
+		return false;
+
+	if (!xfs_verify_fileext(mp, sx->sx_startoff1, sx->sx_blockcount))
+		return false;
+
+	return xfs_verify_fileext(mp, sx->sx_startoff2, sx->sx_blockcount);
+}
+
+/*
+ * Use the recovered log state to create a new request, estimate resource
+ * requirements, and create a new incore intent state.
+ */
+STATIC struct xfs_swapext_intent *
+xfs_sxi_item_recover_intent(
+	struct xfs_mount		*mp,
+	const struct xfs_swap_extent	*sx,
+	struct xfs_swapext_req		*req,
+	unsigned int			*reflink_state)
+{
+	struct xfs_inode		*ip1, *ip2;
+	int				error;
+
+	/*
+	 * Grab both inodes and set IRECOVERY to prevent trimming of post-eof
+	 * extents and freeing of unlinked inodes until we're totally done
+	 * processing files.
+	 */
+	error = xlog_recover_iget(mp, sx->sx_inode1, &ip1);
+	if (error)
+		return ERR_PTR(error);
+	error = xlog_recover_iget(mp, sx->sx_inode2, &ip2);
+	if (error)
+		goto err_rele1;
+
+	req->ip1 = ip1;
+	req->ip2 = ip2;
+	req->startoff1 = sx->sx_startoff1;
+	req->startoff2 = sx->sx_startoff2;
+	req->blockcount = sx->sx_blockcount;
+
+	if (sx->sx_flags & XFS_SWAP_EXT_ATTR_FORK)
+		req->whichfork = XFS_ATTR_FORK;
+	else
+		req->whichfork = XFS_DATA_FORK;
+
+	if (sx->sx_flags & XFS_SWAP_EXT_SET_SIZES)
+		req->req_flags |= XFS_SWAP_REQ_SET_SIZES;
+	if (sx->sx_flags & XFS_SWAP_EXT_INO1_WRITTEN)
+		req->req_flags |= XFS_SWAP_REQ_INO1_WRITTEN;
+	req->req_flags |= XFS_SWAP_REQ_LOGGED;
+
+	xfs_xchg_range_ilock(NULL, ip1, ip2);
+	error = xfs_swapext_estimate(req);
+	xfs_xchg_range_iunlock(ip1, ip2);
+	if (error)
+		goto err_rele2;
+
+	return xfs_swapext_init_intent(req, reflink_state);
+
+err_rele2:
+	xfs_irele(ip2);
+err_rele1:
+	xfs_irele(ip1);
+	return ERR_PTR(error);
+}
+
 /* Process a swapext update intent item that was recovered from the log. */
 STATIC int
 xfs_sxi_item_recover(
-	struct xfs_log_item	*lip,
-	struct list_head	*capture_list)
+	struct xfs_log_item		*lip,
+	struct list_head		*capture_list)
 {
-	return -EFSCORRUPTED;
+	struct xfs_swapext_req		req = { .req_flags = 0 };
+	struct xfs_swapext_intent	*sxi;
+	struct xfs_sxi_log_item		*sxi_lip = SXI_ITEM(lip);
+	struct xfs_mount		*mp = lip->li_log->l_mp;
+	struct xfs_swap_extent		*sx = &sxi_lip->sxi_format.sxi_extent;
+	struct xfs_sxd_log_item		*sxd_lip = NULL;
+	struct xfs_trans		*tp;
+	struct xfs_inode		*ip1, *ip2;
+	unsigned int			reflink_state;
+	int				error = 0;
+
+	if (!xfs_sxi_validate(mp, sxi_lip)) {
+		XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
+				&sxi_lip->sxi_format,
+				sizeof(sxi_lip->sxi_format));
+		return -EFSCORRUPTED;
+	}
+
+	sxi = xfs_sxi_item_recover_intent(mp, sx, &req, &reflink_state);
+	if (IS_ERR(sxi))
+		return PTR_ERR(sxi);
+
+	trace_xfs_swapext_recover(mp, sxi);
+
+	ip1 = sxi->sxi_ip1;
+	ip2 = sxi->sxi_ip2;
+
+	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, req.resblks, 0, 0,
+			&tp);
+	if (error)
+		goto err_rele;
+
+	sxd_lip = xfs_trans_get_sxd(tp, sxi_lip);
+
+	xfs_xchg_range_ilock(tp, ip1, ip2);
+
+	xfs_swapext_ensure_reflink(tp, sxi, reflink_state);
+	error = xfs_swapext_finish_update(tp, &sxd_lip->sxd_item, sxi);
+	if (error == -EAGAIN) {
+		/*
+		 * If there's more extent swapping to be done, we have to
+		 * schedule that as a separate deferred operation to be run
+		 * after we've finished replaying all of the intents we
+		 * recovered from the log.  Transfer ownership of the sxi to
+		 * the transaction.
+		 */
+		xfs_swapext_schedule(tp, sxi);
+		error = 0;
+		sxi = NULL;
+	}
+	if (error == -EFSCORRUPTED)
+		XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, sx,
+				sizeof(*sx));
+	if (error)
+		goto err_cancel;
+
+	/*
+	 * Commit transaction, which frees the transaction and saves the inodes
+	 * for later replay activities.
+	 */
+	error = xfs_defer_ops_capture_and_commit(tp, capture_list);
+	goto err_unlock;
+
+err_cancel:
+	xfs_trans_cancel(tp);
+err_unlock:
+	xfs_xchg_range_iunlock(ip1, ip2);
+err_rele:
+	if (sxi)
+		kmem_cache_free(xfs_swapext_intent_cache, sxi);
+	xfs_irele(ip2);
+	xfs_irele(ip1);
+	return error;
 }
 
 STATIC bool
@@ -167,8 +553,21 @@ xfs_sxi_item_relog(
 	struct xfs_log_item	*intent,
 	struct xfs_trans	*tp)
 {
-	ASSERT(0);
-	return NULL;
+	struct xfs_sxd_log_item		*sxd_lip;
+	struct xfs_sxi_log_item		*sxi_lip;
+	struct xfs_swap_extent		*sx;
+
+	sx = &SXI_ITEM(intent)->sxi_format.sxi_extent;
+
+	tp->t_flags |= XFS_TRANS_DIRTY;
+	sxd_lip = xfs_trans_get_sxd(tp, SXI_ITEM(intent));
+	set_bit(XFS_LI_DIRTY, &sxd_lip->sxd_item.li_flags);
+
+	sxi_lip = xfs_sxi_init(tp->t_mountp);
+	memcpy(&sxi_lip->sxi_format.sxi_extent, sx, sizeof(*sx));
+	xfs_trans_add_item(tp, &sxi_lip->sxi_item);
+	set_bit(XFS_LI_DIRTY, &sxi_lip->sxi_item.li_flags);
+	return &sxi_lip->sxi_item;
 }
 
 static const struct xfs_item_ops xfs_sxi_item_ops = {
@@ -202,17 +601,17 @@ xlog_recover_sxi_commit_pass2(
 
 	sxi_formatp = item->ri_buf[0].i_addr;
 
-	if (sxi_formatp->__pad != 0) {
-		XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, log->l_mp);
-		return -EFSCORRUPTED;
-	}
-
 	len = sizeof(struct xfs_sxi_log_format);
 	if (item->ri_buf[0].i_len != len) {
 		XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, log->l_mp);
 		return -EFSCORRUPTED;
 	}
 
+	if (sxi_formatp->__pad != 0) {
+		XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, log->l_mp);
+		return -EFSCORRUPTED;
+	}
+
 	sxi_lip = xfs_sxi_init(mp);
 	memcpy(&sxi_lip->sxi_format, sxi_formatp, len);
 
diff --git a/fs/xfs/xfs_trace.c b/fs/xfs/xfs_trace.c
index c9a5d8087b63..b43b973f0e10 100644
--- a/fs/xfs/xfs_trace.c
+++ b/fs/xfs/xfs_trace.c
@@ -40,6 +40,7 @@
 #include "scrub/xfbtree.h"
 #include "xfs_btree_mem.h"
 #include "xfs_bmap.h"
+#include "xfs_swapext.h"
 
 /*
  * We include this last to have the helpers above available for the trace
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index faecf54080a8..8e9cb02ca5be 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -79,6 +79,8 @@ struct xfs_dqtrx;
 struct xfs_icwalk;
 struct xfs_perag;
 struct xfs_bmap_intent;
+struct xfs_swapext_intent;
+struct xfs_swapext_req;
 
 #define XFS_ATTR_FILTER_FLAGS \
 	{ XFS_ATTR_ROOT,	"ROOT" }, \
@@ -2181,7 +2183,7 @@ TRACE_EVENT(xfs_dir2_leafn_moveents,
 		  __entry->count)
 );
 
-#define XFS_SWAPEXT_INODES \
+#define XFS_SWAP_EXT_INODES \
 	{ 0,	"target" }, \
 	{ 1,	"temp" }
 
@@ -2216,7 +2218,7 @@ DECLARE_EVENT_CLASS(xfs_swap_extent_class,
 		  "broot size %d, forkoff 0x%x",
 		  MAJOR(__entry->dev), MINOR(__entry->dev),
 		  __entry->ino,
-		  __print_symbolic(__entry->which, XFS_SWAPEXT_INODES),
+		  __print_symbolic(__entry->which, XFS_SWAP_EXT_INODES),
 		  __print_symbolic(__entry->format, XFS_INODE_FORMAT_STR),
 		  __entry->nex,
 		  __entry->broot_size,
@@ -3769,6 +3771,10 @@ DEFINE_INODE_IREC_EVENT(xfs_reflink_cancel_cow);
 DEFINE_INODE_IREC_EVENT(xfs_swap_extent_rmap_remap);
 DEFINE_INODE_IREC_EVENT(xfs_swap_extent_rmap_remap_piece);
 DEFINE_INODE_ERROR_EVENT(xfs_swap_extent_rmap_error);
+DEFINE_INODE_IREC_EVENT(xfs_swapext_extent1_skip);
+DEFINE_INODE_IREC_EVENT(xfs_swapext_extent1);
+DEFINE_INODE_IREC_EVENT(xfs_swapext_extent2);
+DEFINE_ITRUNC_EVENT(xfs_swapext_update_inode_size);
 
 /* fsmap traces */
 DECLARE_EVENT_CLASS(xfs_fsmap_class,
@@ -4614,6 +4620,212 @@ DEFINE_PERAG_INTENTS_EVENT(xfs_perag_wait_intents);
 
 #endif /* CONFIG_XFS_DRAIN_INTENTS */
 
+TRACE_EVENT(xfs_swapext_overhead,
+	TP_PROTO(struct xfs_mount *mp, unsigned long long bmbt_blocks,
+		 unsigned long long rmapbt_blocks),
+	TP_ARGS(mp, bmbt_blocks, rmapbt_blocks),
+	TP_STRUCT__entry(
+		__field(dev_t, dev)
+		__field(unsigned long long, bmbt_blocks)
+		__field(unsigned long long, rmapbt_blocks)
+	),
+	TP_fast_assign(
+		__entry->dev = mp->m_super->s_dev;
+		__entry->bmbt_blocks = bmbt_blocks;
+		__entry->rmapbt_blocks = rmapbt_blocks;
+	),
+	TP_printk("dev %d:%d bmbt_blocks 0x%llx rmapbt_blocks 0x%llx",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		  __entry->bmbt_blocks,
+		  __entry->rmapbt_blocks)
+);
+
+DECLARE_EVENT_CLASS(xfs_swapext_estimate_class,
+	TP_PROTO(const struct xfs_swapext_req *req),
+	TP_ARGS(req),
+	TP_STRUCT__entry(
+		__field(dev_t, dev)
+		__field(xfs_ino_t, ino1)
+		__field(xfs_ino_t, ino2)
+		__field(xfs_fileoff_t, startoff1)
+		__field(xfs_fileoff_t, startoff2)
+		__field(xfs_filblks_t, blockcount)
+		__field(int, whichfork)
+		__field(unsigned int, req_flags)
+		__field(xfs_filblks_t, ip1_bcount)
+		__field(xfs_filblks_t, ip2_bcount)
+		__field(xfs_filblks_t, ip1_rtbcount)
+		__field(xfs_filblks_t, ip2_rtbcount)
+		__field(unsigned long long, resblks)
+		__field(unsigned long long, nr_exchanges)
+	),
+	TP_fast_assign(
+		__entry->dev = req->ip1->i_mount->m_super->s_dev;
+		__entry->ino1 = req->ip1->i_ino;
+		__entry->ino2 = req->ip2->i_ino;
+		__entry->startoff1 = req->startoff1;
+		__entry->startoff2 = req->startoff2;
+		__entry->blockcount = req->blockcount;
+		__entry->whichfork = req->whichfork;
+		__entry->req_flags = req->req_flags;
+		__entry->ip1_bcount = req->ip1_bcount;
+		__entry->ip2_bcount = req->ip2_bcount;
+		__entry->ip1_rtbcount = req->ip1_rtbcount;
+		__entry->ip2_rtbcount = req->ip2_rtbcount;
+		__entry->resblks = req->resblks;
+		__entry->nr_exchanges = req->nr_exchanges;
+	),
+	TP_printk("dev %d:%d ino1 0x%llx fileoff1 0x%llx ino2 0x%llx fileoff2 0x%llx fsbcount 0x%llx flags (%s) fork %s bcount1 0x%llx rtbcount1 0x%llx bcount2 0x%llx rtbcount2 0x%llx resblks 0x%llx nr_exchanges %llu",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		  __entry->ino1, __entry->startoff1,
+		  __entry->ino2, __entry->startoff2,
+		  __entry->blockcount,
+		  __print_flags(__entry->req_flags, "|", XFS_SWAP_REQ_STRINGS),
+		  __print_symbolic(__entry->whichfork, XFS_WHICHFORK_STRINGS),
+		  __entry->ip1_bcount,
+		  __entry->ip1_rtbcount,
+		  __entry->ip2_bcount,
+		  __entry->ip2_rtbcount,
+		  __entry->resblks,
+		  __entry->nr_exchanges)
+);
+
+#define DEFINE_SWAPEXT_ESTIMATE_EVENT(name)	\
+DEFINE_EVENT(xfs_swapext_estimate_class, name,	\
+	TP_PROTO(const struct xfs_swapext_req *req), \
+	TP_ARGS(req))
+DEFINE_SWAPEXT_ESTIMATE_EVENT(xfs_swapext_initial_estimate);
+DEFINE_SWAPEXT_ESTIMATE_EVENT(xfs_swapext_final_estimate);
+
+DECLARE_EVENT_CLASS(xfs_swapext_intent_class,
+	TP_PROTO(struct xfs_mount *mp, const struct xfs_swapext_intent *sxi),
+	TP_ARGS(mp, sxi),
+	TP_STRUCT__entry(
+		__field(dev_t, dev)
+		__field(xfs_ino_t, ino1)
+		__field(xfs_ino_t, ino2)
+		__field(unsigned int, flags)
+		__field(unsigned int, opflags)
+		__field(xfs_fileoff_t, startoff1)
+		__field(xfs_fileoff_t, startoff2)
+		__field(xfs_filblks_t, blockcount)
+		__field(xfs_fsize_t, isize1)
+		__field(xfs_fsize_t, isize2)
+		__field(xfs_fsize_t, new_isize1)
+		__field(xfs_fsize_t, new_isize2)
+	),
+	TP_fast_assign(
+		__entry->dev = mp->m_super->s_dev;
+		__entry->ino1 = sxi->sxi_ip1->i_ino;
+		__entry->ino2 = sxi->sxi_ip2->i_ino;
+		__entry->flags = sxi->sxi_flags;
+		__entry->opflags = sxi->sxi_op_flags;
+		__entry->startoff1 = sxi->sxi_startoff1;
+		__entry->startoff2 = sxi->sxi_startoff2;
+		__entry->blockcount = sxi->sxi_blockcount;
+		__entry->isize1 = sxi->sxi_ip1->i_disk_size;
+		__entry->isize2 = sxi->sxi_ip2->i_disk_size;
+		__entry->new_isize1 = sxi->sxi_isize1;
+		__entry->new_isize2 = sxi->sxi_isize2;
+	),
+	TP_printk("dev %d:%d ino1 0x%llx fileoff1 0x%llx ino2 0x%llx fileoff2 0x%llx fsbcount 0x%llx flags (%s) opflags (%s) isize1 0x%llx newisize1 0x%llx isize2 0x%llx newisize2 0x%llx",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		  __entry->ino1, __entry->startoff1,
+		  __entry->ino2, __entry->startoff2,
+		  __entry->blockcount,
+		  __print_flags(__entry->flags, "|", XFS_SWAP_EXT_STRINGS),
+		  __print_flags(__entry->opflags, "|", XFS_SWAP_EXT_OP_STRINGS),
+		  __entry->isize1, __entry->new_isize1,
+		  __entry->isize2, __entry->new_isize2)
+);
+
+#define DEFINE_SWAPEXT_INTENT_EVENT(name)	\
+DEFINE_EVENT(xfs_swapext_intent_class, name,	\
+	TP_PROTO(struct xfs_mount *mp, const struct xfs_swapext_intent *sxi), \
+	TP_ARGS(mp, sxi))
+DEFINE_SWAPEXT_INTENT_EVENT(xfs_swapext_defer);
+DEFINE_SWAPEXT_INTENT_EVENT(xfs_swapext_recover);
+
+TRACE_EVENT(xfs_swapext_delta_nextents_step,
+	TP_PROTO(struct xfs_mount *mp,
+		 const struct xfs_bmbt_irec *left,
+		 const struct xfs_bmbt_irec *curr,
+		 const struct xfs_bmbt_irec *new,
+		 const struct xfs_bmbt_irec *right,
+		 int delta, unsigned int state),
+	TP_ARGS(mp, left, curr, new, right, delta, state),
+	TP_STRUCT__entry(
+		__field(dev_t, dev)
+		__field(xfs_fileoff_t, loff)
+		__field(xfs_fsblock_t, lstart)
+		__field(xfs_filblks_t, lcount)
+		__field(xfs_fileoff_t, coff)
+		__field(xfs_fsblock_t, cstart)
+		__field(xfs_filblks_t, ccount)
+		__field(xfs_fileoff_t, noff)
+		__field(xfs_fsblock_t, nstart)
+		__field(xfs_filblks_t, ncount)
+		__field(xfs_fileoff_t, roff)
+		__field(xfs_fsblock_t, rstart)
+		__field(xfs_filblks_t, rcount)
+		__field(int, delta)
+		__field(unsigned int, state)
+	),
+	TP_fast_assign(
+		__entry->dev = mp->m_super->s_dev;
+		__entry->loff = left->br_startoff;
+		__entry->lstart = left->br_startblock;
+		__entry->lcount = left->br_blockcount;
+		__entry->coff = curr->br_startoff;
+		__entry->cstart = curr->br_startblock;
+		__entry->ccount = curr->br_blockcount;
+		__entry->noff = new->br_startoff;
+		__entry->nstart = new->br_startblock;
+		__entry->ncount = new->br_blockcount;
+		__entry->roff = right->br_startoff;
+		__entry->rstart = right->br_startblock;
+		__entry->rcount = right->br_blockcount;
+		__entry->delta = delta;
+		__entry->state = state;
+	),
+	TP_printk("dev %d:%d left 0x%llx:0x%llx:0x%llx; curr 0x%llx:0x%llx:0x%llx <- new 0x%llx:0x%llx:0x%llx; right 0x%llx:0x%llx:0x%llx delta %d state 0x%x",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		__entry->loff, __entry->lstart, __entry->lcount,
+		__entry->coff, __entry->cstart, __entry->ccount,
+		__entry->noff, __entry->nstart, __entry->ncount,
+		__entry->roff, __entry->rstart, __entry->rcount,
+		__entry->delta, __entry->state)
+);
+
+TRACE_EVENT(xfs_swapext_delta_nextents,
+	TP_PROTO(const struct xfs_swapext_req *req, int64_t d_nexts1,
+		 int64_t d_nexts2),
+	TP_ARGS(req, d_nexts1, d_nexts2),
+	TP_STRUCT__entry(
+		__field(dev_t, dev)
+		__field(xfs_ino_t, ino1)
+		__field(xfs_ino_t, ino2)
+		__field(xfs_extnum_t, nexts1)
+		__field(xfs_extnum_t, nexts2)
+		__field(int64_t, d_nexts1)
+		__field(int64_t, d_nexts2)
+	),
+	TP_fast_assign(
+		__entry->dev = req->ip1->i_mount->m_super->s_dev;
+		__entry->ino1 = req->ip1->i_ino;
+		__entry->ino2 = req->ip2->i_ino;
+		__entry->nexts1 = xfs_ifork_ptr(req->ip1, req->whichfork)->if_nextents;
+		__entry->nexts2 = xfs_ifork_ptr(req->ip2, req->whichfork)->if_nextents;
+		__entry->d_nexts1 = d_nexts1;
+		__entry->d_nexts2 = d_nexts2;
+	),
+	TP_printk("dev %d:%d ino1 0x%llx nexts %llu ino2 0x%llx nexts %llu delta1 %lld delta2 %lld",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		  __entry->ino1, __entry->nexts1,
+		  __entry->ino2, __entry->nexts2,
+		  __entry->d_nexts1, __entry->d_nexts2)
+);
+
 #endif /* _TRACE_XFS_H */
 
 #undef TRACE_INCLUDE_PATH
diff --git a/fs/xfs/xfs_xchgrange.c b/fs/xfs/xfs_xchgrange.c
index b91df426d426..965f8bfc3f59 100644
--- a/fs/xfs/xfs_xchgrange.c
+++ b/fs/xfs/xfs_xchgrange.c
@@ -12,6 +12,7 @@
 #include "xfs_defer.h"
 #include "xfs_inode.h"
 #include "xfs_trans.h"
+#include "xfs_swapext.h"
 #include "xfs_xchgrange.h"
 #include <linux/fsnotify.h>
 
@@ -338,6 +339,55 @@ xfs_exch_range(
 	file_start_write(file2);
 	error = __xfs_exch_range(file1, file2, fxr);
 	file_end_write(file2);
+	return error;
+}
+
+/* XFS-specific parts of XFS_IOC_EXCHANGE_RANGE */
+
+/* Lock (and optionally join) two inodes for a file range exchange. */
+void
+xfs_xchg_range_ilock(
+	struct xfs_trans	*tp,
+	struct xfs_inode	*ip1,
+	struct xfs_inode	*ip2)
+{
+	if (ip1 != ip2)
+		xfs_lock_two_inodes(ip1, XFS_ILOCK_EXCL,
+				    ip2, XFS_ILOCK_EXCL);
+	else
+		xfs_ilock(ip1, XFS_ILOCK_EXCL);
+	if (tp) {
+		xfs_trans_ijoin(tp, ip1, 0);
+		if (ip2 != ip1)
+			xfs_trans_ijoin(tp, ip2, 0);
+	}
+
+}
+
+/* Unlock two inodes after a file range exchange operation. */
+void
+xfs_xchg_range_iunlock(
+	struct xfs_inode	*ip1,
+	struct xfs_inode	*ip2)
+{
+	if (ip2 != ip1)
+		xfs_iunlock(ip2, XFS_ILOCK_EXCL);
+	xfs_iunlock(ip1, XFS_ILOCK_EXCL);
+}
+
+/*
+ * Estimate the resource requirements to exchange file contents between the two
+ * files.  The caller is required to hold the IOLOCK and the MMAPLOCK and to
+ * have flushed both inodes' pagecache and active direct-ios.
+ */
+int
+xfs_xchg_range_estimate(
+	struct xfs_swapext_req	*req)
+{
+	int			error;
 
+	xfs_xchg_range_ilock(NULL, req->ip1, req->ip2);
+	error = xfs_swapext_estimate(req);
+	xfs_xchg_range_iunlock(req->ip1, req->ip2);
 	return error;
 }
diff --git a/fs/xfs/xfs_xchgrange.h b/fs/xfs/xfs_xchgrange.h
index 414fce7a159f..3870e78f4807 100644
--- a/fs/xfs/xfs_xchgrange.h
+++ b/fs/xfs/xfs_xchgrange.h
@@ -15,4 +15,14 @@ int xfs_exch_range_finish(struct file *file1, struct file *file2);
 int xfs_exch_range(struct file *file1, struct file *file2,
 		struct xfs_exch_range *fxr);
 
+/* XFS-specific parts of file exchanges */
+
+struct xfs_swapext_req;
+
+void xfs_xchg_range_ilock(struct xfs_trans *tp, struct xfs_inode *ip1,
+		struct xfs_inode *ip2);
+void xfs_xchg_range_iunlock(struct xfs_inode *ip1, struct xfs_inode *ip2);
+
+int xfs_xchg_range_estimate(struct xfs_swapext_req *req);
+
 #endif /* __XFS_XCHGRANGE_H__ */
