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[RFC][PATCH 2/5] Virtualization/containers: UIDs [message #1240 is a reply to message #1239] Fri, 03 February 2006 17:01 Go to previous messageGo to previous message
dev is currently offline  dev
Messages: 1693
Registered: September 2005
Location: Moscow
Senior Member
The simplest virtualization of UID hashes, just to demonstrate our
approach. Each container has it's own set of uids and should simply
allocate hash/initialize it on startup.

Kirill

--- ./include/linux/vps_info.h.vps_uid_hash 2006-02-03 16:49:26.000000000 +0300
+++ ./include/linux/vps_info.h 2006-02-03 16:49:51.000000000 +0300
@@ -5,11 +5,14 @@
#include <asm/atomic.h>

struct task_struct;
+struct list_head;

struct vps_info {
u32 id;
struct task_struct *init_task;
atomic_t refcnt;
+
+ struct list_head *vps_uid_hash;
};

extern struct vps_info host_vps_info;
--- ./kernel/user.c.vps_uid_hash 2006-02-03 16:49:08.000000000 +0300
+++ ./kernel/user.c 2006-02-03 16:49:51.000000000 +0300
@@ -14,6 +14,7 @@
#include <linux/bitops.h>
#include <linux/key.h>
#include <linux/interrupt.h>
+#include <linux/vps_info.h>

/*
* UID task count cache, to get fast user lookup in "alloc_uid"
@@ -24,7 +25,8 @@
#define UIDHASH_SZ (1 << UIDHASH_BITS)
#define UIDHASH_MASK (UIDHASH_SZ - 1)
#define __uidhashfn(uid) (((uid >> UIDHASH_BITS) + uid) & UIDHASH_MASK)
-#define uidhashentry(uid) (uidhash_table + __uidhashfn((uid)))
+#define uidhashentry(uid) (current_vps()->vps_uid_hash + \
+ __uidhashfn((uid)))

static kmem_cache_t *uid_cachep;
static struct list_head uidhash_table[UIDHASH_SZ];
@@ -200,6 +202,7 @@

/* Insert the root user immediately (init already runs as root) */
spin_lock_irq(&uidhash_lock);
+ host_vps_info.vps_uid_hash = uidhash_table;
uid_hash_insert(&root_user, uidhashentry(0));
spin_unlock_irq(&uidhash_lock);

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