ext2: fix ignored return value of generic_write_sync()

Fix ext2_dio_write_iter() to propagate the error returned by
generic_write_sync() instead of silently discarding it, which could
cause write(2) to return success to userspace on O_SYNC/O_DSYNC files
even when the sync failed.

The correct pattern, already used in ext2_dax_write_iter() in the same
file and in ext4, xfs, f2fs among others, is:
    if (ret > 0)
        ret = generic_write_sync(iocb, ret);

Found by Linux Verification Center (linuxtesting.org) with SVACE.

[JK: Reflect also filemap_write_and_wait() return value]

Fixes: fb5de43 ("ext2: Move direct-io to use iomap")
Signed-off-by: Danila Chernetsov <listdansp@mail.ru>
Link: https://patch.msgid.link/20260530122311.136803-1-listdansp@mail.ru
Signed-off-by: Jan Kara <jack@suse.cz>

Author: DanCh2020

fs/ext2/file.c

@@ -161,12 +161,15 @@ static ssize_t ext2_dio_write_iter(struct kiocb *iocb, struct iov_iter *from)
 		endbyte = pos + status - 1;
 		ret2 = filemap_write_and_wait_range(inode->i_mapping, pos,
 						    endbyte);
-		if (!ret2)
+		if (!ret2) {
 			invalidate_mapping_pages(inode->i_mapping,
 						 pos >> PAGE_SHIFT,
 						 endbyte >> PAGE_SHIFT);
-		if (ret > 0)
-			generic_write_sync(iocb, ret);
+			if (ret > 0)
+				ret = generic_write_sync(iocb, ret);
+		} else {
+			ret = ret2;
+		}
 	}
 
 out_unlock: