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fold destroy_super() into __put_super() 

There's only one caller of destroy_super() left now.  Fold it there,
and replace those list_lru_destroy() calls with checks that they
had already been done (as they should have, when we were dropping
the last active reference).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-10-11 13:48:55 -04:00
parent 0200894d11
commit c645b93098
1 changed files with 10 additions and 21 deletions
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31
fs/super.c
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@ -154,23 +154,6 @@ static void destroy_super_rcu(struct rcu_head *head)
schedule_work(&s->destroy_work); schedule_work(&s->destroy_work);
} }
/**
* destroy_super - frees a superblock
* @s: superblock to free
*
* Frees a superblock.
*/
static void destroy_super(struct super_block *s)
{
list_lru_destroy(&s->s_dentry_lru);
list_lru_destroy(&s->s_inode_lru);
security_sb_free(s);
WARN_ON(!list_empty(&s->s_mounts));
put_user_ns(s->s_user_ns);
kfree(s->s_subtype);
call_rcu(&s->rcu, destroy_super_rcu);
}
/* Free a superblock that has never been seen by anyone */ /* Free a superblock that has never been seen by anyone */
static void destroy_unused_super(struct super_block *s) static void destroy_unused_super(struct super_block *s)
{ {
@ -280,11 +263,17 @@ fail:
/* /*
* Drop a superblock's refcount. The caller must hold sb_lock. * Drop a superblock's refcount. The caller must hold sb_lock.
*/ */
static void __put_super(struct super_block *sb) static void __put_super(struct super_block *s)
{ {
if (!--sb->s_count) { if (!--s->s_count) {
list_del_init(&sb->s_list); list_del_init(&s->s_list);
destroy_super(sb); WARN_ON(s->s_dentry_lru.node);
WARN_ON(s->s_inode_lru.node);
WARN_ON(!list_empty(&s->s_mounts));
security_sb_free(s);
put_user_ns(s->s_user_ns);
kfree(s->s_subtype);
call_rcu(&s->rcu, destroy_super_rcu);
} }
} }