[PATCH 4/4] xfs: remove xfs_page_mkwrite_iomap_ops

[Christoph Hellwig <hch@lst.de>]

Shared the regular buffered write iomap_ops with the page fault path
and just check for the IOMAP_FAULT flag to skip delalloc punching.

This keeps the delalloc punching checks in one place, and will make it
easier to convert iomap to an iter model where the begin and end
handlers are merged into a single callback.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/xfs_file.c  |  2 +-
 fs/xfs/xfs_iomap.c | 17 ++++++++---------
 fs/xfs/xfs_iomap.h |  1 -
 3 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 7464d874e766..c6de6b865ef1 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1474,7 +1474,7 @@ xfs_write_fault(
 	if (IS_DAX(inode))
 		ret = xfs_dax_fault_locked(vmf, order, true);
 	else
-		ret = iomap_page_mkwrite(vmf, &xfs_page_mkwrite_iomap_ops);
+		ret = iomap_page_mkwrite(vmf, &xfs_buffered_write_iomap_ops);
 	xfs_iunlock(ip, lock_mode);
 
 	sb_end_pagefault(inode->i_sb);
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 916531d9f83c..bfc5b0a4d633 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -1234,6 +1234,14 @@ xfs_buffered_write_iomap_end(
 	if (iomap->type != IOMAP_DELALLOC || !(iomap->flags & IOMAP_F_NEW))
 		return 0;
 
+	/*
+	 * iomap_page_mkwrite() will never fail in a way that requires delalloc
+	 * extents that it allocated to be revoked.  Hence never try to release
+	 * them here.
+	 */
+	if (flags & IOMAP_FAULT)
+		return 0;
+
 	/* Nothing to do if we've written the entire delalloc extent */
 	start_byte = iomap_last_written_block(inode, offset, written);
 	end_byte = round_up(offset + length, i_blocksize(inode));
@@ -1260,15 +1268,6 @@ const struct iomap_ops xfs_buffered_write_iomap_ops = {
 	.iomap_end		= xfs_buffered_write_iomap_end,
 };
 
-/*
- * iomap_page_mkwrite() will never fail in a way that requires delalloc extents
- * that it allocated to be revoked. Hence we do not need an .iomap_end method
- * for this operation.
- */
-const struct iomap_ops xfs_page_mkwrite_iomap_ops = {
-	.iomap_begin		= xfs_buffered_write_iomap_begin,
-};
-
 static int
 xfs_read_iomap_begin(
 	struct inode		*inode,
diff --git a/fs/xfs/xfs_iomap.h b/fs/xfs/xfs_iomap.h
index 4da13440bae9..8347268af727 100644
--- a/fs/xfs/xfs_iomap.h
+++ b/fs/xfs/xfs_iomap.h
@@ -48,7 +48,6 @@ xfs_aligned_fsb_count(
 }
 
 extern const struct iomap_ops xfs_buffered_write_iomap_ops;
-extern const struct iomap_ops xfs_page_mkwrite_iomap_ops;
 extern const struct iomap_ops xfs_direct_write_iomap_ops;
 extern const struct iomap_ops xfs_read_iomap_ops;
 extern const struct iomap_ops xfs_seek_iomap_ops;
-- 
2.45.2