diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 164790c1b419..6b7e6eb29414 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -50,6 +50,7 @@
 #include "xfs_ag_resv.h"
 #include "xfs_refcount.h"
 #include "xfs_rmap_btree.h"
+#include "xfs_icache.h"
 
 
 kmem_zone_t		*xfs_bmap_free_item_zone;
@@ -4154,8 +4155,9 @@ int
 xfs_bmapi_reserve_delalloc(
 	struct xfs_inode	*ip,
 	int			whichfork,
-	xfs_fileoff_t		aoff,
+	xfs_fileoff_t		off,
 	xfs_filblks_t		len,
+	xfs_filblks_t		prealloc,
 	struct xfs_bmbt_irec	*got,
 	xfs_extnum_t		*lastx,
 	int			eof)
@@ -4167,10 +4169,17 @@ xfs_bmapi_reserve_delalloc(
 	char			rt = XFS_IS_REALTIME_INODE(ip);
 	xfs_extlen_t		extsz;
 	int			error;
+	xfs_fileoff_t		aoff = off;
 
-	alen = XFS_FILBLKS_MIN(len, MAXEXTLEN);
+	/*
+	 * Cap the alloc length. Keep track of prealloc so we know whether to
+	 * tag the inode before we return.
+	 */
+	alen = XFS_FILBLKS_MIN(len + prealloc, MAXEXTLEN);
 	if (!eof)
 		alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff);
+	if (prealloc && alen >= len)
+		prealloc = alen - len;
 
 	/* Figure out the extent size, adjust alen */
 	if (whichfork == XFS_COW_FORK)
@@ -4236,6 +4245,16 @@ xfs_bmapi_reserve_delalloc(
 	 */
 	xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *lastx), got);
 
+	/*
+	 * Tag the inode if blocks were preallocated. Note that COW fork
+	 * preallocation can occur at the start or end of the extent, even when
+	 * prealloc == 0, so we must also check the aligned offset and length.
+	 */
+	if (whichfork == XFS_DATA_FORK && prealloc)
+		xfs_inode_set_eofblocks_tag(ip);
+	if (whichfork == XFS_COW_FORK && (prealloc || aoff < off || alen > len))
+		xfs_inode_set_cowblocks_tag(ip);
+
 	ASSERT(got->br_startoff <= aoff);
 	ASSERT(got->br_startoff + got->br_blockcount >= aoff + alen);
 	ASSERT(isnullstartblock(got->br_startblock));
diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h
index ffed1f9208ce..cecd094404cc 100644
--- a/fs/xfs/libxfs/xfs_bmap.h
+++ b/fs/xfs/libxfs/xfs_bmap.h
@@ -238,7 +238,7 @@ int	xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip,
 		int num_exts);
 int	xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset);
 int	xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork,
-		xfs_fileoff_t aoff, xfs_filblks_t len,
+		xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc,
 		struct xfs_bmbt_irec *got, xfs_extnum_t *lastx, int eof);
 
 enum xfs_bmap_intent_type {
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 2272190b70ae..e4bfde212cc2 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -620,7 +620,7 @@ xfs_file_iomap_begin_delay(
 
 retry:
 	error = xfs_bmapi_reserve_delalloc(ip, XFS_DATA_FORK, offset_fsb,
-			end_fsb - offset_fsb, &got, &idx, eof);
+			end_fsb - offset_fsb, 0, &got, &idx, eof);
 	switch (error) {
 	case 0:
 		break;
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index c58371fde08d..a5b027a43990 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -295,7 +295,7 @@ xfs_reflink_reserve_cow(
 
 retry:
 	error = xfs_bmapi_reserve_delalloc(ip, XFS_COW_FORK, imap->br_startoff,
-			end_fsb - imap->br_startoff, &got, &idx, eof);
+			end_fsb - imap->br_startoff, 0, &got, &idx, eof);
 	switch (error) {
 	case 0:
 		break;