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Added sharing of pager capabilities with children or siblings

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Pagers can now share their own private capabilities with their
paged children, or their siblings with whom they have a common pager
ancestor.

Added flags CAP_SHARE_CHILD and CAP_SHARE_SIBLINGS for that.
This commit is contained in:
Bahadir Balban
2009-10-23 13:50:32 +03:00
parent f4c9ea50bc
commit 6093214981
10 changed files with 73 additions and 23 deletions
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37
src/api/capability.c
View File

@@ -48,10 +48,14 @@ int read_task_capabilities(void *userbuf)
}
/*
* Currently shares _all_ capabilities of a task
* with a collection of threads
* Currently shares _all_ capabilities of a task with a
* collection of threads
*
* FIXME: Check ownership for sharing.
*
* Currently we don't need to check since we _only_ share
* the ones from our own private list. If we shared from
* a collection's list, we would need to check ownership.
*/
int capability_share(unsigned int share_flags)
{
@@ -64,11 +68,32 @@ int capability_share(unsigned int share_flags)
cap_list_move(&curcont->cap_list,
&current->cap_list);
break;
case CAP_SHARE_GROUP: {
struct ktcb *tgr_leader;
case CAP_SHARE_CHILD:
/*
* Move own capabilities to paged-children
* cap list so that all children can benefit
* from our own capabilities.
*/
cap_list_move(&current->pager_cap_list,
&current->cap_list);
break;
case CAP_SHARE_SIBLING: {
/* Find our pager */
struct ktcb *pager = tcb_find(current->pagerid);
BUG_ON(!(tgr_leader = tcb_find(current->tgid)));
cap_list_move(&tgr_leader->tgr_cap_list,
/*
* Add own capabilities to its
* paged-children cap_list
*/
cap_list_move(&pager->pager_cap_list,
&current->cap_list);
break;
}
case CAP_SHARE_GROUP: {
struct ktcb *tgroup_leader;
BUG_ON(!(tgroup_leader = tcb_find(current->tgid)));
cap_list_move(&tgroup_leader->tgroup_cap_list,
&current->cap_list);
break;
}

2
src/api/thread.c
View File

@@ -395,6 +395,8 @@ int thread_create(struct task_ids *ids, unsigned int flags)
else
new->pagerid = new->tid;
//printk("Thread (%d) pager set as (%d)\n", new->tid, new->pagerid);
/*
* Setup container-generic fields from current task
*/

12
src/generic/capability.c
View File

@@ -81,7 +81,7 @@ struct capability *capability_find_by_rtype(struct ktcb *task,
unsigned int rtype)
{
struct capability *cap;
struct ktcb *tgleader;
struct ktcb *tgleader, *pager;
/* Search task's own list */
list_foreach_struct(cap, &task->cap_list.caps, list)
@@ -97,7 +97,15 @@ struct capability *capability_find_by_rtype(struct ktcb *task,
BUG_ON(!(tgleader = tcb_find(task->tgid)));
/* Search thread group list */
list_foreach_struct(cap, &tgleader->tgr_cap_list.caps, list)
list_foreach_struct(cap, &tgleader->tgroup_cap_list.caps, list)
if (cap_rtype(cap) == rtype)
return cap;
/* Find pager */
BUG_ON(!(pager = tcb_find(task->pagerid)));
/* Search pager's paged-children capability list */
list_foreach_struct(cap, &pager->pager_cap_list.caps, list)
if (cap_rtype(cap) == rtype)
return cap;

2
src/generic/tcb.c
View File

@@ -31,7 +31,7 @@ void tcb_init(struct ktcb *new)
mutex_init(&new->thread_control_lock);
cap_list_init(&new->cap_list);
cap_list_init(&new->tgr_cap_list);
cap_list_init(&new->tgroup_cap_list);
cap_list_init(&new->pager_cap_list);
/* Initialise task's scheduling state and parameters. */