xfs: support the COW fork in xfs_bmap_punch_delalloc_range

xfs_buffered_write_iomap_begin can also create delallocate reservations
that need cleaning up, prepare for that by adding support for the COW
fork in xfs_bmap_punch_delalloc_range.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

fs/xfs/xfs_aops.c

@@ -116,7 +116,7 @@ xfs_end_ioend(
 	if (unlikely(error)) {
 		if (ioend->io_flags & IOMAP_F_SHARED) {
 			xfs_reflink_cancel_cow_range(ip, offset, size, true);
-			xfs_bmap_punch_delalloc_range(ip, offset,
+			xfs_bmap_punch_delalloc_range(ip, XFS_DATA_FORK, offset,
 					offset + size);
 		}
 		goto done;
@@ -456,7 +456,7 @@ xfs_discard_folio(
 	 * byte of the next folio. Hence the end offset is only dependent on the
 	 * folio itself and not the start offset that is passed in.
 	 */
-	xfs_bmap_punch_delalloc_range(ip, pos,
+	xfs_bmap_punch_delalloc_range(ip, XFS_DATA_FORK, pos,
 				folio_pos(folio) + folio_size(folio));
 }
 

fs/xfs/xfs_bmap_util.c

@@ -442,11 +442,12 @@ xfs_getbmap(
 void
 xfs_bmap_punch_delalloc_range(
 	struct xfs_inode	*ip,
+	int			whichfork,
 	xfs_off_t		start_byte,
 	xfs_off_t		end_byte)
 {
 	struct xfs_mount	*mp = ip->i_mount;
-	struct xfs_ifork	*ifp = &ip->i_df;
+	struct xfs_ifork	*ifp = xfs_ifork_ptr(ip, whichfork);
 	xfs_fileoff_t		start_fsb = XFS_B_TO_FSBT(mp, start_byte);
 	xfs_fileoff_t		end_fsb = XFS_B_TO_FSB(mp, end_byte);
 	struct xfs_bmbt_irec	got, del;
@@ -474,11 +475,14 @@ xfs_bmap_punch_delalloc_range(
 			continue;
 		}
 
-		xfs_bmap_del_extent_delay(ip, XFS_DATA_FORK, &icur, &got, &del);
+		xfs_bmap_del_extent_delay(ip, whichfork, &icur, &got, &del);
 		if (!xfs_iext_get_extent(ifp, &icur, &got))
 			break;
 	}
 
+	if (whichfork == XFS_COW_FORK && !ifp->if_bytes)
+		xfs_inode_clear_cowblocks_tag(ip);
+
 out_unlock:
 	xfs_iunlock(ip, XFS_ILOCK_EXCL);
 }
@@ -580,7 +584,7 @@ xfs_free_eofblocks(
 	 */
 	if (ip->i_diflags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) {
 		if (ip->i_delayed_blks) {
-			xfs_bmap_punch_delalloc_range(ip,
+			xfs_bmap_punch_delalloc_range(ip, XFS_DATA_FORK,
 				round_up(XFS_ISIZE(ip), mp->m_sb.sb_blocksize),
 				LLONG_MAX);
 		}

fs/xfs/xfs_bmap_util.h

@@ -30,7 +30,7 @@ xfs_bmap_rtalloc(struct xfs_bmalloca *ap)
 }
 #endif /* CONFIG_XFS_RT */
 
-void	xfs_bmap_punch_delalloc_range(struct xfs_inode *ip,
+void	xfs_bmap_punch_delalloc_range(struct xfs_inode *ip, int whichfork,
 		xfs_off_t start_byte, xfs_off_t end_byte);
 
 struct kgetbmap {

fs/xfs/xfs_iomap.c

@@ -1215,7 +1215,8 @@ xfs_buffered_write_delalloc_punch(
 	loff_t			length,
 	struct iomap		*iomap)
 {
-	xfs_bmap_punch_delalloc_range(XFS_I(inode), offset, offset + length);
+	xfs_bmap_punch_delalloc_range(XFS_I(inode), XFS_DATA_FORK, offset,
+			offset + length);
 }
 
 static int