ipc: store ipcs into IDRs

This patch introduces ipcs storage into IDRs. The main changes are:
  . This ipc_ids structure is changed: the entries array is changed into a
    root idr structure.
  . The grow_ary() routine is removed: it is not needed anymore when adding
    an ipc structure, since we are now using the IDR facility.
  . The ipc_rmid() routine interface is changed:
       . there is no need for this routine to return the pointer passed in as
         argument: it is now declared as a void
       . since the id is now part of the kern_ipc_perm structure, no need to
         have it as an argument to the routine

Signed-off-by: Nadia Derbey <Nadia.Derbey@bull.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 1 insertions, 3 deletions

diff --git a/include/linux/ipc.h b/include/linux/ipc.h
index ee111834091c..96988d1460da 100644
--- a/include/linux/ipc.h
+++ b/include/linux/ipc.h
@@ -89,6 +89,7 @@ struct kern_ipc_perm
 {
         spinlock_t      lock;
         int             deleted;
+        int             id;
         key_t           key;
         uid_t           uid;
         gid_t           gid;
diff --git a/include/linux/msg.h b/include/linux/msg.h
index f1b60740d641..10a3d5a1abff 100644
--- a/include/linux/msg.h
+++ b/include/linux/msg.h
@@ -77,7 +77,6 @@ struct msg_msg {
 /* one msq_queue structure for each present queue on the system */
 struct msg_queue {
         struct kern_ipc_perm q_perm;
-        int q_id;
         time_t q_stime;                 /* last msgsnd time */
         time_t q_rtime;                 /* last msgrcv time */
         time_t q_ctime;                 /* last change time */
diff --git a/include/linux/sem.h b/include/linux/sem.h
index 9aaffb0b1d81..c8eaad9e4b72 100644
--- a/include/linux/sem.h
+++ b/include/linux/sem.h
@@ -90,7 +90,6 @@ struct sem {
 /* One sem_array data structure for each set of semaphores in the system. */
 struct sem_array {
         struct kern_ipc_perm    sem_perm;       /* permissions .. see ipc.h */
-        int                     sem_id;
         time_t                  sem_otime;      /* last semop time */
         time_t                  sem_ctime;      /* last change time */
         struct sem              *sem_base;      /* ptr to first semaphore in array */
diff --git a/include/linux/shm.h b/include/linux/shm.h
index bea65d9c93ef..eeaed921a1dc 100644
--- a/include/linux/shm.h
+++ b/include/linux/shm.h
@@ -79,7 +79,6 @@ struct shmid_kernel /* private to the kernel */
 {       
         struct kern_ipc_perm    shm_perm;
         struct file *           shm_file;
-        int                     id;
         unsigned long           shm_nattch;
         unsigned long           shm_segsz;
         time_t                  shm_atim;