*/
static int __init ipc_init(void)
{
- int err_sem, err_msg;
-
proc_mkdir("sysvipc", NULL);
- err_sem = sem_init();
- WARN(err_sem, "ipc: sysv sem_init failed: %d\n", err_sem);
- err_msg = msg_init();
- WARN(err_msg, "ipc: sysv msg_init failed: %d\n", err_msg);
+ sem_init();
+ msg_init();
shm_init();
- return err_msg ? err_msg : err_sem;
+ return 0;
}
device_initcall(ipc_init);
* Set up the sequence range to use for the ipc identifier range (limited
* below IPCMNI) then initialise the keys hashtable and ids idr.
*/
-int ipc_init_ids(struct ipc_ids *ids)
+void ipc_init_ids(struct ipc_ids *ids)
{
- int err;
ids->in_use = 0;
ids->seq = 0;
init_rwsem(&ids->rwsem);
- err = rhashtable_init(&ids->key_ht, &ipc_kht_params);
- if (err)
- return err;
+ rhashtable_init(&ids->key_ht, &ipc_kht_params);
idr_init(&ids->ipcs_idr);
- ids->tables_initialized = true;
- ids->max_id = -1;
+ ids->max_idx = -1;
#ifdef CONFIG_CHECKPOINT_RESTORE
ids->next_id = -1;
#endif
- return 0;
}
#ifdef CONFIG_PROC_FS
*/
static struct kern_ipc_perm *ipc_findkey(struct ipc_ids *ids, key_t key)
{
- struct kern_ipc_perm *ipcp = NULL;
+ struct kern_ipc_perm *ipcp;
- if (likely(ids->tables_initialized))
- ipcp = rhashtable_lookup_fast(&ids->key_ht, &key,
+ ipcp = rhashtable_lookup_fast(&ids->key_ht, &key,
ipc_kht_params);
+ if (!ipcp)
+ return NULL;
- if (ipcp) {
- rcu_read_lock();
- ipc_lock_object(ipcp);
- return ipcp;
- }
-
- return NULL;
+ rcu_read_lock();
+ ipc_lock_object(ipcp);
+ return ipcp;
}
/*
* @limit: limit for the number of used ids
*
* Add an entry 'new' to the ipc ids idr. The permissions object is
- * initialised and the first free entry is set up and the id assigned
+ * initialised and the first free entry is set up and the index assigned
* is returned. The 'new' entry is returned in a locked state on success.
*
* On failure the entry is not locked and a negative err-code is returned.
if (limit > IPCMNI)
limit = IPCMNI;
- if (!ids->tables_initialized || ids->in_use >= limit)
+ if (ids->in_use >= limit)
return -ENOSPC;
idr_preload(GFP_KERNEL);
}
ids->in_use++;
- if (idx > ids->max_id)
- ids->max_id = idx;
+ if (idx > ids->max_idx)
+ ids->max_idx = idx;
return idx;
}
*/
void ipc_rmid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp)
{
- int lid = ipcid_to_idx(ipcp->id);
+ int idx = ipcid_to_idx(ipcp->id);
- idr_remove(&ids->ipcs_idr, lid);
+ idr_remove(&ids->ipcs_idr, idx);
ipc_kht_remove(ids, ipcp);
ids->in_use--;
ipcp->deleted = true;
- if (unlikely(lid == ids->max_id)) {
+ if (unlikely(idx == ids->max_idx)) {
do {
- lid--;
- if (lid == -1)
+ idx--;
+ if (idx == -1)
break;
- } while (!idr_find(&ids->ipcs_idr, lid));
- ids->max_id = lid;
+ } while (!idr_find(&ids->ipcs_idr, idx));
+ ids->max_idx = idx;
}
}
ipcp->key = IPC_PRIVATE;
}
-int ipc_rcu_getref(struct kern_ipc_perm *ptr)
+bool ipc_rcu_getref(struct kern_ipc_perm *ptr)
{
return refcount_inc_not_zero(&ptr->refcount);
}
struct kern_ipc_perm *ipc_obtain_object_idr(struct ipc_ids *ids, int id)
{
struct kern_ipc_perm *out;
- int lid = ipcid_to_idx(id);
-
- if (unlikely(!ids->tables_initialized))
- return ERR_PTR(-EINVAL);
+ int idx = ipcid_to_idx(id);
- out = idr_find(&ids->ipcs_idr, lid);
+ out = idr_find(&ids->ipcs_idr, idx);
if (!out)
return ERR_PTR(-EINVAL);
return out;
}
-/**
- * ipc_lock - lock an ipc structure without rwsem held
- * @ids: ipc identifier set
- * @id: ipc id to look for
- *
- * Look for an id in the ipc ids idr and lock the associated ipc object.
- *
- * The ipc object is locked on successful exit.
- */
-struct kern_ipc_perm *ipc_lock(struct ipc_ids *ids, int id)
-{
- struct kern_ipc_perm *out;
-
- rcu_read_lock();
- out = ipc_obtain_object_idr(ids, id);
- if (IS_ERR(out))
- goto err;
-
- spin_lock(&out->lock);
-
- /*
- * ipc_rmid() may have already freed the ID while ipc_lock()
- * was spinning: here verify that the structure is still valid.
- * Upon races with RMID, return -EIDRM, thus indicating that
- * the ID points to a removed identifier.
- */
- if (ipc_valid_object(out))
- return out;
-
- spin_unlock(&out->lock);
- out = ERR_PTR(-EIDRM);
-err:
- rcu_read_unlock();
- return out;
-}
-
/**
* ipc_obtain_object_check
* @ids: ipc identifier set
* @id: ipc id to look for
*
- * Similar to ipc_obtain_object_idr() but also checks
- * the ipc object reference counter.
+ * Similar to ipc_obtain_object_idr() but also checks the ipc object
+ * sequence number.
*
* Call inside the RCU critical section.
* The ipc object is *not* locked on exit.
}
/**
- * ipcctl_pre_down_nolock - retrieve an ipc and check permissions for some IPC_XXX cmd
+ * ipcctl_obtain_check - retrieve an ipc object and check permissions
* @ns: ipc namespace
* @ids: the table of ids where to look for the ipc
* @id: the id of the ipc to retrieve
*
* This function does some common audit and permissions check for some IPC_XXX
* cmd and is called from semctl_down, shmctl_down and msgctl_down.
- * It must be called without any lock held and:
*
- * - retrieves the ipc with the given id in the given table.
+ * It:
+ * - retrieves the ipc object with the given id in the given table.
* - performs some audit and permission check, depending on the given cmd
* - returns a pointer to the ipc object or otherwise, the corresponding
* error.
*
* Call holding the both the rwsem and the rcu read lock.
*/
-struct kern_ipc_perm *ipcctl_pre_down_nolock(struct ipc_namespace *ns,
+struct kern_ipc_perm *ipcctl_obtain_check(struct ipc_namespace *ns,
struct ipc_ids *ids, int id, int cmd,
struct ipc64_perm *perm, int extra_perm)
{
projects / linux-2.6-microblaze.git / blobdiff