[PATCH 1/1] creds: print user_struct refcounts
Serge Hallyn
serue at us.ibm.com
Mon Oct 13 14:36:05 PDT 2008
print user_struct refcounts at alloc, and print msg at uid free.
Signed-off-by: Serge Hallyn <serue at us.ibm.com>
Signed-off-by: David Howells <dhowells at redhat.com>
---
kernel/user.c | 12 +++++++++++-
1 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/kernel/user.c b/kernel/user.c
index d476307..073296e 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -317,6 +317,7 @@ done:
static inline void free_user(struct user_struct *up, unsigned long flags)
{
/* restore back the count */
+ printk(KERN_NOTICE "%s: freeing a uid (%d)\n", __func__, up->uid);
atomic_inc(&up->__count);
spin_unlock_irqrestore(&uidhash_lock, flags);
@@ -337,6 +338,7 @@ static inline void uids_mutex_unlock(void) { }
*/
static inline void free_user(struct user_struct *up, unsigned long flags)
{
+ printk(KERN_NOTICE "%s: freeing a uid (%d)\n", __func__, up->uid);
uid_hash_remove(up);
spin_unlock_irqrestore(&uidhash_lock, flags);
sched_destroy_user(up);
@@ -422,16 +424,24 @@ struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid)
key_put(new->uid_keyring);
key_put(new->session_keyring);
kmem_cache_free(uid_cachep, new);
+ printk(KERN_NOTICE "%s: reuse a uid (%d) (cnt %u)\n",
+ __func__, uid, atomic_read(&up->__count));
+
} else {
uid_hash_insert(new, hashent);
up = new;
+ printk(KERN_NOTICE "%s: alloced a uid (%d) (cnt %u)\n",
+ __func__, uid, atomic_read(&up->__count));
+
}
spin_unlock_irq(&uidhash_lock);
+ } else {
+ printk(KERN_NOTICE "%s: reuse a uid (%d) (cnt %u)\n",
+ __func__, uid, atomic_read(&up->__count));
}
uids_mutex_unlock();
-
return up;
out_destoy_sched:
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