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authorDavid Howells <dhowells@redhat.com>2005-06-23 22:00:49 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-24 00:05:18 -0700
commit76d8aeabfeb1c42641a81c44280177b9a08670d8 (patch)
tree0a584439bb44e440717aa77a1398ba9eea24a137 /include/linux
parent7286aa9b9ab35f20b1ff16d867f4535701df99b5 (diff)
[PATCH] keys: Discard key spinlock and use RCU for key payload
The attached patch changes the key implementation in a number of ways: (1) It removes the spinlock from the key structure. (2) The key flags are now accessed using atomic bitops instead of write-locking the key spinlock and using C bitwise operators. The three instantiation flags are dealt with with the construction semaphore held during the request_key/instantiate/negate sequence, thus rendering the spinlock superfluous. The key flags are also now bit numbers not bit masks. (3) The key payload is now accessed using RCU. This permits the recursive keyring search algorithm to be simplified greatly since no locks need be taken other than the usual RCU preemption disablement. Searching now does not require any locks or semaphores to be held; merely that the starting keyring be pinned. (4) The keyring payload now includes an RCU head so that it can be disposed of by call_rcu(). This requires that the payload be copied on unlink to prevent introducing races in copy-down vs search-up. (5) The user key payload is now a structure with the data following it. It includes an RCU head like the keyring payload and for the same reason. It also contains a data length because the data length in the key may be changed on another CPU whilst an RCU protected read is in progress on the payload. This would then see the supposed RCU payload and the on-key data length getting out of sync. I'm tempted to drop the key's datalen entirely, except that it's used in conjunction with quota management and so is a little tricky to get rid of. (6) Update the keys documentation. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/key-ui.h6
-rw-r--r--include/linux/key.h25
2 files changed, 19 insertions, 12 deletions
diff --git a/include/linux/key-ui.h b/include/linux/key-ui.h
index 60cc7b762e78..159ca8d54e9a 100644
--- a/include/linux/key-ui.h
+++ b/include/linux/key-ui.h
@@ -31,8 +31,10 @@ extern spinlock_t key_serial_lock;
* subscribed
*/
struct keyring_list {
- unsigned maxkeys; /* max keys this list can hold */
- unsigned nkeys; /* number of keys currently held */
+ struct rcu_head rcu; /* RCU deletion hook */
+ unsigned short maxkeys; /* max keys this list can hold */
+ unsigned short nkeys; /* number of keys currently held */
+ unsigned short delkey; /* key to be unlinked by RCU */
struct key *keys[0];
};
diff --git a/include/linux/key.h b/include/linux/key.h
index 6aa46d0e812f..2c24ffaca86f 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -18,7 +18,7 @@
#include <linux/types.h>
#include <linux/list.h>
#include <linux/rbtree.h>
-#include <linux/spinlock.h>
+#include <linux/rcupdate.h>
#include <asm/atomic.h>
#ifdef __KERNEL__
@@ -78,7 +78,6 @@ struct key {
key_serial_t serial; /* key serial number */
struct rb_node serial_node;
struct key_type *type; /* type of key */
- rwlock_t lock; /* examination vs change lock */
struct rw_semaphore sem; /* change vs change sem */
struct key_user *user; /* owner of this key */
time_t expiry; /* time at which key expires (or 0) */
@@ -86,14 +85,10 @@ struct key {
gid_t gid;
key_perm_t perm; /* access permissions */
unsigned short quotalen; /* length added to quota */
- unsigned short datalen; /* payload data length */
- unsigned short flags; /* status flags (change with lock writelocked) */
-#define KEY_FLAG_INSTANTIATED 0x00000001 /* set if key has been instantiated */
-#define KEY_FLAG_DEAD 0x00000002 /* set if key type has been deleted */
-#define KEY_FLAG_REVOKED 0x00000004 /* set if key had been revoked */
-#define KEY_FLAG_IN_QUOTA 0x00000008 /* set if key consumes quota */
-#define KEY_FLAG_USER_CONSTRUCT 0x00000010 /* set if key is being constructed in userspace */
-#define KEY_FLAG_NEGATIVE 0x00000020 /* set if key is negative */
+ unsigned short datalen; /* payload data length
+ * - may not match RCU dereferenced payload
+ * - payload should contain own length
+ */
#ifdef KEY_DEBUGGING
unsigned magic;
@@ -101,6 +96,14 @@ struct key {
#define KEY_DEBUG_MAGIC_X 0xf8e9dacbu
#endif
+ unsigned long flags; /* status flags (change with bitops) */
+#define KEY_FLAG_INSTANTIATED 0 /* set if key has been instantiated */
+#define KEY_FLAG_DEAD 1 /* set if key type has been deleted */
+#define KEY_FLAG_REVOKED 2 /* set if key had been revoked */
+#define KEY_FLAG_IN_QUOTA 3 /* set if key consumes quota */
+#define KEY_FLAG_USER_CONSTRUCT 4 /* set if key is being constructed in userspace */
+#define KEY_FLAG_NEGATIVE 5 /* set if key is negative */
+
/* the description string
* - this is used to match a key against search criteria
* - this should be a printable string
@@ -250,6 +253,8 @@ extern int keyring_add_key(struct key *keyring,
extern struct key *key_lookup(key_serial_t id);
+extern void keyring_replace_payload(struct key *key, void *replacement);
+
#define key_serial(key) ((key) ? (key)->serial : 0)
/*