fs: convert block_commit_write to return void

block_commit_write() always returns 0, this patch changes it to return
void.

Link: https://lkml.kernel.org/r/20230626055518.842392-3-beanhuo@iokpp.deSigned-off-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Luís Henriques <ocfs2-devel@oss.oracle.com>
Cc: Mark Fasheh <mark@fasheh.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

fs/buffer.c

@@ -2180,7 +2180,7 @@ int __block_write_begin(struct page *page, loff_t pos, unsigned len,
 }
 EXPORT_SYMBOL(__block_write_begin);
 
-static int __block_commit_write(struct folio *folio, size_t from, size_t to)
+static void __block_commit_write(struct folio *folio, size_t from, size_t to)
 {
 	size_t block_start, block_end;
 	bool partial = false;
@@ -2215,7 +2215,6 @@ static int __block_commit_write(struct folio *folio, size_t from, size_t to)
 	 */
 	if (!partial)
 		folio_mark_uptodate(folio);
-	return 0;
 }
 
 /*
@@ -2596,11 +2595,10 @@ int cont_write_begin(struct file *file, struct address_space *mapping,
 }
 EXPORT_SYMBOL(cont_write_begin);
 
-int block_commit_write(struct page *page, unsigned from, unsigned to)
+void block_commit_write(struct page *page, unsigned from, unsigned to)
 {
 	struct folio *folio = page_folio(page);
 	__block_commit_write(folio, from, to);
-	return 0;
 }
 EXPORT_SYMBOL(block_commit_write);
 
@@ -2646,11 +2644,11 @@ int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
 		end = size - folio_pos(folio);
 
 	ret = __block_write_begin_int(folio, 0, end, get_block, NULL);
-	if (!ret)
-		ret = __block_commit_write(folio, 0, end);
-
-	if (unlikely(ret < 0))
+	if (unlikely(ret))
 		goto out_unlock;
+
+	__block_commit_write(folio, 0, end);
+
 	folio_mark_dirty(folio);
 	folio_wait_stable(folio);
 	return 0;

fs/ext4/move_extent.c

@@ -392,14 +392,11 @@ move_extent_per_page(struct file *o_filp, struct inode *donor_inode,
 	for (i = 0; i < block_len_in_page; i++) {
 		*err = ext4_get_block(orig_inode, orig_blk_offset + i, bh, 0);
 		if (*err < 0)
-			break;
+			goto repair_branches;
 		bh = bh->b_this_page;
 	}
-	if (!*err)
-		*err = block_commit_write(&folio[0]->page, from, from + replaced_size);
 
-	if (unlikely(*err < 0))
-		goto repair_branches;
+	block_commit_write(&folio[0]->page, from, from + replaced_size);
 
 	/* Even in case of data=writeback it is reasonable to pin
 	 * inode to transaction, to prevent unexpected data loss */

fs/ocfs2/file.c

@@ -808,12 +808,7 @@ static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
 
 
 		/* must not update i_size! */
-		ret = block_commit_write(page, block_start + 1,
-					 block_start + 1);
-		if (ret < 0)
-			mlog_errno(ret);
-		else
-			ret = 0;
+		block_commit_write(page, block_start + 1, block_start + 1);
 	}
 
 	/*

fs/udf/file.c

@@ -63,13 +63,13 @@ static vm_fault_t udf_page_mkwrite(struct vm_fault *vmf)
 	else
 		end = PAGE_SIZE;
 	err = __block_write_begin(page, 0, end, udf_get_block);
-	if (!err)
-		err = block_commit_write(page, 0, end);
-	if (err < 0) {
+	if (err) {
 		unlock_page(page);
 		ret = block_page_mkwrite_return(err);
 		goto out_unlock;
 	}
+
+	block_commit_write(page, 0, end);
 out_dirty:
 	set_page_dirty(page);
 	wait_for_stable_page(page);

include/linux/buffer_head.h

@@ -288,7 +288,7 @@ int cont_write_begin(struct file *, struct address_space *, loff_t,
 			unsigned, struct page **, void **,
 			get_block_t *, loff_t *);
 int generic_cont_expand_simple(struct inode *inode, loff_t size);
-int block_commit_write(struct page *page, unsigned from, unsigned to);
+void block_commit_write(struct page *page, unsigned int from, unsigned int to);
 int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
 				get_block_t get_block);
 /* Convert errno to return value from ->page_mkwrite() call */