[PATCH 2/3] f2fs: clean up f2fs_truncate_partial_cluster()

[Chao Yu <chao@kernel.org>]

Clean up codes as below:
- avoid unnecessary "err > 0" check condition
- simply if-else condition in the loop
- use "1 << log_cluster_size" instead of F2FS_I(inode)->i_cluster_size

No logic changes.

Signed-off-by: Chao Yu <chao@kernel.org>
---
 fs/f2fs/compress.c | 33 +++++++++++++++------------------
 1 file changed, 15 insertions(+), 18 deletions(-)

diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index 6cd8902849cf..e37a7ed801e5 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -1215,9 +1215,11 @@ int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
 {
 	void *fsdata = NULL;
 	struct page *pagep;
+	struct page **rpages;
 	int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
 	pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
 							log_cluster_size;
+	int i;
 	int err;
 
 	err = f2fs_is_compressed_cluster(inode, start_idx);
@@ -1238,26 +1240,21 @@ int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
 	if (err <= 0)
 		return err;
 
-	if (err > 0) {
-		struct page **rpages = fsdata;
-		int cluster_size = F2FS_I(inode)->i_cluster_size;
-		int i;
-
-		for (i = cluster_size - 1; i >= 0; i--) {
-			struct folio *folio = page_folio(rpages[i]);
-			loff_t start = (loff_t)folio->index << PAGE_SHIFT;
-
-			if (from <= start) {
-				folio_zero_segment(folio, 0, folio_size(folio));
-			} else {
-				folio_zero_segment(folio, from - start,
-						folio_size(folio));
-				break;
-			}
-		}
+	rpages = fsdata;
+
+	for (i = (1 << log_cluster_size) - 1; i >= 0; i--) {
+		struct folio *folio = page_folio(rpages[i]);
+		loff_t start = (loff_t)folio->index << PAGE_SHIFT;
 
-		f2fs_compress_write_end(inode, fsdata, start_idx, true);
+		if (from > start) {
+			folio_zero_segment(folio, from - start,
+					folio_size(folio));
+			break;
+		}
+		folio_zero_segment(folio, 0, folio_size(folio));
 	}
+
+	f2fs_compress_write_end(inode, fsdata, start_idx, true);
 	return 0;
 }
 
-- 
2.49.0