From: David Sterba <dsterba@suse.com>
Date: Tue, 15 Sep 2020 19:10:03 +0000 (+0200)
Subject: btrfs: document byte swap optimization of root_item::flags accessors
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=49547068f6fdd148d62eaeb06163213422125d9b;p=linux.git

btrfs: document byte swap optimization of root_item::flags accessors

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index d78cb2d89d7e1..a3b628ea4d64e 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2216,11 +2216,13 @@ BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
 
 static inline bool btrfs_root_readonly(const struct btrfs_root *root)
 {
+	/* Byte-swap the constant at compile time, root_item::flags is LE */
 	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
 }
 
 static inline bool btrfs_root_dead(const struct btrfs_root *root)
 {
+	/* Byte-swap the constant at compile time, root_item::flags is LE */
 	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
 }