erofs: avoid some unnecessary #ifdefs

They can either be removed or replaced with IS_ENABLED().

Signed-off-by: Ferry Meng <mengferry@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Author: jdmfr

fs/erofs/data.c

@@ -365,12 +365,10 @@ int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 		 u64 start, u64 len)
 {
 	if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout)) {
-#ifdef CONFIG_EROFS_FS_ZIP
+		if (!IS_ENABLED(CONFIG_EROFS_FS_ZIP))
+			return -EOPNOTSUPP;
 		return iomap_fiemap(inode, fieinfo, start, len,
 				    &z_erofs_iomap_report_ops);
-#else
-		return -EOPNOTSUPP;
-#endif
 	}
 	return iomap_fiemap(inode, fieinfo, start, len, &erofs_iomap_ops);
 }
@@ -428,10 +426,9 @@ static ssize_t erofs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 	if (!iov_iter_count(to))
 		return 0;
 
-#ifdef CONFIG_FS_DAX
-	if (IS_DAX(inode))
+	if (IS_ENABLED(CONFIG_FS_DAX) && IS_DAX(inode))
 		return dax_iomap_rw(iocb, to, &erofs_iomap_ops);
-#endif
+
 	if ((iocb->ki_flags & IOCB_DIRECT) && inode->i_sb->s_bdev) {
 		struct erofs_iomap_iter_ctx iter_ctx = {
 			.realinode = inode,
@@ -491,12 +488,11 @@ static loff_t erofs_file_llseek(struct file *file, loff_t offset, int whence)
 	struct inode *inode = file->f_mapping->host;
 	const struct iomap_ops *ops = &erofs_iomap_ops;
 
-	if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout))
-#ifdef CONFIG_EROFS_FS_ZIP
+	if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout)) {
+		if (!IS_ENABLED(CONFIG_EROFS_FS_ZIP))
+			return generic_file_llseek(file, offset, whence);
 		ops = &z_erofs_iomap_report_ops;
-#else
-		return generic_file_llseek(file, offset, whence);
-#endif
+	}
 
 	if (whence == SEEK_HOLE)
 		offset = iomap_seek_hole(inode, offset, ops);

fs/erofs/super.c

@@ -381,12 +381,10 @@ static void erofs_default_options(struct erofs_sb_info *sbi)
 	sbi->opt.cache_strategy = EROFS_ZIP_CACHE_READAROUND;
 	sbi->sync_decompress = EROFS_SYNC_DECOMPRESS_AUTO;
 #endif
-#ifdef CONFIG_EROFS_FS_XATTR
-	set_opt(&sbi->opt, XATTR_USER);
-#endif
-#ifdef CONFIG_EROFS_FS_POSIX_ACL
-	set_opt(&sbi->opt, POSIX_ACL);
-#endif
+	if (IS_ENABLED(CONFIG_EROFS_FS_XATTR))
+		set_opt(&sbi->opt, XATTR_USER);
+	if (IS_ENABLED(CONFIG_EROFS_FS_POSIX_ACL))
+		set_opt(&sbi->opt, POSIX_ACL);
 }
 
 enum {
@@ -1125,11 +1123,8 @@ static int erofs_show_options(struct seq_file *seq, struct dentry *root)
 
 static void erofs_evict_inode(struct inode *inode)
 {
-#ifdef CONFIG_FS_DAX
 	if (IS_DAX(inode))
 		dax_break_layout_final(inode);
-#endif
-
 	erofs_ishare_free_inode(inode);
 	truncate_inode_pages_final(&inode->i_data);
 	clear_inode(inode);

fs/erofs/sysfs.c

@@ -168,11 +168,10 @@ static ssize_t erofs_attr_store(struct kobject *kobj, struct attribute *attr,
 			return ret;
 		if (t != (unsigned int)t)
 			return -ERANGE;
-#ifdef CONFIG_EROFS_FS_ZIP
-		if (!strcmp(a->attr.name, "sync_decompress") &&
+		if (IS_ENABLED(CONFIG_EROFS_FS_ZIP) &&
+		    !strcmp(a->attr.name, "sync_decompress") &&
 		    (t > EROFS_SYNC_DECOMPRESS_FORCE_OFF))
 			return -EINVAL;
-#endif
 		*(unsigned int *)ptr = t;
 		return len;
 	case attr_pointer_bool: