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

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Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2020-09-15 21:10:03 +02:00
parent 7735cd755b
commit 49547068f6
1 changed files with 2 additions and 0 deletions
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2
fs/btrfs/ctree.h
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@ -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;
}