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authorSerge E. Hallyn <serue@us.ibm.com>2009-09-02 09:14:05 +0100
committerJames Morris <jmorris@namei.org>2009-09-02 21:29:14 +1000
commitad73a717e0fc6949c44e587ca5d63c273a30e6f5 (patch)
tree28aa8de2eb924a60713abd01bbc790879da5b70c /security/keys
parent5d135440faf7db8d566de0c6fab36b16cf9cfc3b (diff)
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KEYS: Make /proc/keys use keyid not numread as file position [try #6]
Make the file position maintained by /proc/keys represent the ID of the key just read rather than the number of keys read. This should make it faster to perform a lookup as we don't have to scan the key ID tree from the beginning to find the current position. Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/keys')
-rw-r--r--security/keys/proc.c77
1 files changed, 55 insertions, 22 deletions
diff --git a/security/keys/proc.c b/security/keys/proc.c
index 39793c774f3..624c650c2ef 100644
--- a/security/keys/proc.c
+++ b/security/keys/proc.c
@@ -91,57 +91,90 @@ __initcall(key_proc_init);
*/
#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
-static struct rb_node *__key_serial_next(struct rb_node *n)
+static struct rb_node *key_serial_next(struct rb_node *n)
{
+ struct user_namespace *user_ns = current_user_ns();
+
+ n = rb_next(n);
while (n) {
struct key *key = rb_entry(n, struct key, serial_node);
- if (key->user->user_ns == current_user_ns())
+ if (key->user->user_ns == user_ns)
break;
n = rb_next(n);
}
return n;
}
-static struct rb_node *key_serial_next(struct rb_node *n)
+static int proc_keys_open(struct inode *inode, struct file *file)
{
- return __key_serial_next(rb_next(n));
+ return seq_open(file, &proc_keys_ops);
}
-static struct rb_node *key_serial_first(struct rb_root *r)
+static struct key *find_ge_key(key_serial_t id)
{
- struct rb_node *n = rb_first(r);
- return __key_serial_next(n);
-}
+ struct user_namespace *user_ns = current_user_ns();
+ struct rb_node *n = key_serial_tree.rb_node;
+ struct key *minkey = NULL;
-static int proc_keys_open(struct inode *inode, struct file *file)
-{
- return seq_open(file, &proc_keys_ops);
+ while (n) {
+ struct key *key = rb_entry(n, struct key, serial_node);
+ if (id < key->serial) {
+ if (!minkey || minkey->serial > key->serial)
+ minkey = key;
+ n = n->rb_left;
+ } else if (id > key->serial) {
+ n = n->rb_right;
+ } else {
+ minkey = key;
+ break;
+ }
+ key = NULL;
+ }
+ if (!minkey)
+ return NULL;
+
+ for (;;) {
+ if (minkey->user->user_ns == user_ns)
+ return minkey;
+ n = rb_next(&minkey->serial_node);
+ if (!n)
+ return NULL;
+ minkey = rb_entry(n, struct key, serial_node);
+ }
}
static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
__acquires(key_serial_lock)
{
- struct rb_node *_p;
- loff_t pos = *_pos;
+ key_serial_t pos = *_pos;
+ struct key *key;
spin_lock(&key_serial_lock);
- _p = key_serial_first(&key_serial_tree);
- while (pos > 0 && _p) {
- pos--;
- _p = key_serial_next(_p);
- }
-
- return _p;
+ if (*_pos > INT_MAX)
+ return NULL;
+ key = find_ge_key(pos);
+ if (!key)
+ return NULL;
+ *_pos = key->serial;
+ return &key->serial_node;
+}
+static inline key_serial_t key_node_serial(struct rb_node *n)
+{
+ struct key *key = rb_entry(n, struct key, serial_node);
+ return key->serial;
}
static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
{
- (*_pos)++;
- return key_serial_next((struct rb_node *) v);
+ struct rb_node *n;
+ n = key_serial_next(v);
+ if (n)
+ *_pos = key_node_serial(n);
+ return n;
}
static void proc_keys_stop(struct seq_file *p, void *v)