proc: Generalize proc_sys_prune_dcache into proc_prune_siblings_dcache
This prepares the way for allowing the pid part of proc to use this dcache pruning code as well. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Родитель
0afa5ca822
Коммит
26dbc60f38
|
@ -103,6 +103,44 @@ void __init proc_init_kmemcache(void)
|
|||
BUILD_BUG_ON(sizeof(struct proc_dir_entry) >= SIZEOF_PDE);
|
||||
}
|
||||
|
||||
void proc_prune_siblings_dcache(struct hlist_head *inodes, spinlock_t *lock)
|
||||
{
|
||||
struct inode *inode;
|
||||
struct proc_inode *ei;
|
||||
struct hlist_node *node;
|
||||
struct super_block *sb;
|
||||
|
||||
rcu_read_lock();
|
||||
for (;;) {
|
||||
node = hlist_first_rcu(inodes);
|
||||
if (!node)
|
||||
break;
|
||||
ei = hlist_entry(node, struct proc_inode, sibling_inodes);
|
||||
spin_lock(lock);
|
||||
hlist_del_init_rcu(&ei->sibling_inodes);
|
||||
spin_unlock(lock);
|
||||
|
||||
inode = &ei->vfs_inode;
|
||||
sb = inode->i_sb;
|
||||
if (!atomic_inc_not_zero(&sb->s_active))
|
||||
continue;
|
||||
inode = igrab(inode);
|
||||
rcu_read_unlock();
|
||||
if (unlikely(!inode)) {
|
||||
deactivate_super(sb);
|
||||
rcu_read_lock();
|
||||
continue;
|
||||
}
|
||||
|
||||
d_prune_aliases(inode);
|
||||
iput(inode);
|
||||
deactivate_super(sb);
|
||||
|
||||
rcu_read_lock();
|
||||
}
|
||||
rcu_read_unlock();
|
||||
}
|
||||
|
||||
static int proc_show_options(struct seq_file *seq, struct dentry *root)
|
||||
{
|
||||
struct super_block *sb = root->d_sb;
|
||||
|
|
|
@ -210,6 +210,7 @@ extern const struct inode_operations proc_pid_link_inode_operations;
|
|||
extern const struct super_operations proc_sops;
|
||||
|
||||
void proc_init_kmemcache(void);
|
||||
void proc_prune_siblings_dcache(struct hlist_head *inodes, spinlock_t *lock);
|
||||
void set_proc_pid_nlink(void);
|
||||
extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
|
||||
extern void proc_entry_rundown(struct proc_dir_entry *);
|
||||
|
|
|
@ -269,40 +269,7 @@ static void unuse_table(struct ctl_table_header *p)
|
|||
|
||||
static void proc_sys_prune_dcache(struct ctl_table_header *head)
|
||||
{
|
||||
struct inode *inode;
|
||||
struct proc_inode *ei;
|
||||
struct hlist_node *node;
|
||||
struct super_block *sb;
|
||||
|
||||
rcu_read_lock();
|
||||
for (;;) {
|
||||
node = hlist_first_rcu(&head->inodes);
|
||||
if (!node)
|
||||
break;
|
||||
ei = hlist_entry(node, struct proc_inode, sibling_inodes);
|
||||
spin_lock(&sysctl_lock);
|
||||
hlist_del_init_rcu(&ei->sibling_inodes);
|
||||
spin_unlock(&sysctl_lock);
|
||||
|
||||
inode = &ei->vfs_inode;
|
||||
sb = inode->i_sb;
|
||||
if (!atomic_inc_not_zero(&sb->s_active))
|
||||
continue;
|
||||
inode = igrab(inode);
|
||||
rcu_read_unlock();
|
||||
if (unlikely(!inode)) {
|
||||
deactivate_super(sb);
|
||||
rcu_read_lock();
|
||||
continue;
|
||||
}
|
||||
|
||||
d_prune_aliases(inode);
|
||||
iput(inode);
|
||||
deactivate_super(sb);
|
||||
|
||||
rcu_read_lock();
|
||||
}
|
||||
rcu_read_unlock();
|
||||
proc_prune_siblings_dcache(&head->inodes, &sysctl_lock);
|
||||
}
|
||||
|
||||
/* called under sysctl_lock, will reacquire if has to wait */
|
||||
|
|
Загрузка…
Ссылка в новой задаче