iomap: pass flags to iomap_file_buffered_write_punch_delalloc

To fix short write error handling, We'll need to figure out what operation
iomap_file_buffered_write_punch_delalloc is called for.  Pass the flags
argument on to it, and reorder the argument list to match that of
->iomap_end so that the compiler only has to add the new punch argument
to the end of it instead of reshuffling the registers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240910043949.3481298-4-hch@lst.de
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: Christoph Hellwig

fs/iomap/buffered-io.c

@@ -23,7 +23,6 @@
 
 #define IOEND_BATCH_SIZE	4096
 
-typedef int (*iomap_punch_t)(struct inode *inode, loff_t offset, loff_t length);
 /*
  * Structure allocated for each folio to track per-block uptodate, dirty state
  * and I/O completions.
@@ -1200,8 +1199,8 @@ static int iomap_write_delalloc_scan(struct inode *inode,
  * require sprinkling this code with magic "+ 1" and "- 1" arithmetic and expose
  * the code to subtle off-by-one bugs....
  */
-static int iomap_write_delalloc_release(struct inode *inode,
-		loff_t start_byte, loff_t end_byte, iomap_punch_t punch)
+static int iomap_write_delalloc_release(struct inode *inode, loff_t start_byte,
+		loff_t end_byte, unsigned flags, iomap_punch_t punch)
 {
 	loff_t punch_start_byte = start_byte;
 	loff_t scan_end_byte = min(i_size_read(inode), end_byte);
@@ -1301,8 +1300,8 @@ static int iomap_write_delalloc_release(struct inode *inode,
  *         internal filesystem allocation lock
  */
 int iomap_file_buffered_write_punch_delalloc(struct inode *inode,
-		struct iomap *iomap, loff_t pos, loff_t length,
-		ssize_t written, iomap_punch_t punch)
+		loff_t pos, loff_t length, ssize_t written, unsigned flags,
+		struct iomap *iomap, iomap_punch_t punch)
 {
 	loff_t			start_byte;
 	loff_t			end_byte;
@@ -1330,7 +1329,7 @@ int iomap_file_buffered_write_punch_delalloc(struct inode *inode,
 	if (start_byte >= end_byte)
 		return 0;
 
-	return iomap_write_delalloc_release(inode, start_byte, end_byte,
+	return iomap_write_delalloc_release(inode, start_byte, end_byte, flags,
 					punch);
 }
 EXPORT_SYMBOL_GPL(iomap_file_buffered_write_punch_delalloc);

fs/xfs/xfs_iomap.c

@@ -1231,8 +1231,9 @@ xfs_buffered_write_iomap_end(
 	struct xfs_mount	*mp = XFS_M(inode->i_sb);
 	int			error;
 
-	error = iomap_file_buffered_write_punch_delalloc(inode, iomap, offset,
-			length, written, &xfs_buffered_write_delalloc_punch);
+	error = iomap_file_buffered_write_punch_delalloc(inode, offset, length,
+			written, flags, iomap,
+			&xfs_buffered_write_delalloc_punch);
 	if (error && !xfs_is_shutdown(mp)) {
 		xfs_alert(mp, "%s: unable to clean up ino 0x%llx",
 			__func__, XFS_I(inode)->i_ino);

include/linux/iomap.h

@@ -258,10 +258,6 @@ static inline const struct iomap *iomap_iter_srcmap(const struct iomap_iter *i)
 
 ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
 		const struct iomap_ops *ops, void *private);
-int iomap_file_buffered_write_punch_delalloc(struct inode *inode,
-		struct iomap *iomap, loff_t pos, loff_t length, ssize_t written,
-		int (*punch)(struct inode *inode, loff_t pos, loff_t length));
-
 int iomap_read_folio(struct folio *folio, const struct iomap_ops *ops);
 void iomap_readahead(struct readahead_control *, const struct iomap_ops *ops);
 bool iomap_is_partially_uptodate(struct folio *, size_t from, size_t count);
@@ -277,6 +273,12 @@ int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
 		const struct iomap_ops *ops);
 vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf,
 			const struct iomap_ops *ops);
+
+typedef int (*iomap_punch_t)(struct inode *inode, loff_t offset, loff_t length);
+int iomap_file_buffered_write_punch_delalloc(struct inode *inode, loff_t pos,
+		loff_t length, ssize_t written, unsigned flag,
+		struct iomap *iomap, iomap_punch_t punch);
+
 int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 		u64 start, u64 len, const struct iomap_ops *ops);
 loff_t iomap_seek_hole(struct inode *inode, loff_t offset,