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procfs/do_fork: wait until procfs entries are registered

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Do not return from fork() until mcctrl side has created mckernel's
procfs entries for the child PID.

This fixes programs doing fork() immediately followed by opening
/proc/<child pid>/something, and would get some error

Refs: #1189
Change-Id: Ie10ea56b65c55f59e96a1ab6ef83a1070e36048d
This commit is contained in:
Dominique Martinet
2018-08-30 14:13:38 +09:00
committed by Masamichi Takagi
parent b11377f2e9
commit ecc850dfef
4 changed files with 37 additions and 13 deletions
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38
executer/kernel/mcctrl/procfs.c
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@ -700,33 +700,48 @@ struct procfs_work {
int msg;
int pid;
unsigned long arg;
unsigned long resp_pa;
struct work_struct work;
};
static void procfsm_work_main(struct work_struct *work0)
{
struct procfs_work *work = container_of(work0, struct procfs_work, work);
unsigned long phys;
int *done;
switch (work->msg) {
case SCD_MSG_PROCFS_TID_CREATE:
add_tid_entry(ihk_host_os_get_index(work->os), work->pid, work->arg);
break;
case SCD_MSG_PROCFS_TID_CREATE:
add_tid_entry(ihk_host_os_get_index(work->os),
work->pid, work->arg);
phys = ihk_device_map_memory(ihk_os_to_dev(work->os),
work->resp_pa, sizeof(int));
done = ihk_device_map_virtual(ihk_os_to_dev(work->os),
phys, sizeof(int), NULL, 0);
*done = 1;
ihk_device_unmap_virtual(ihk_os_to_dev(work->os),
done, sizeof(int));
ihk_device_unmap_memory(ihk_os_to_dev(work->os),
phys, sizeof(int));
break;
case SCD_MSG_PROCFS_TID_DELETE:
delete_tid_entry(ihk_host_os_get_index(work->os), work->pid, work->arg);
break;
case SCD_MSG_PROCFS_TID_DELETE:
delete_tid_entry(ihk_host_os_get_index(work->os),
work->pid, work->arg);
break;
default:
printk("%s: unknown work: msg: %d, pid: %d, arg: %lu)\n",
__FUNCTION__, work->msg, work->pid, work->arg);
break;
default:
pr_warn("%s: unknown work: msg: %d, pid: %d, arg: %lu)\n",
__func__, work->msg, work->pid, work->arg);
break;
}
kfree(work);
return;
}
int procfsm_packet_handler(void *os, int msg, int pid, unsigned long arg)
int procfsm_packet_handler(void *os, int msg, int pid, unsigned long arg,
unsigned long resp_pa)
{
struct procfs_work *work = NULL;
@ -740,6 +755,7 @@ int procfsm_packet_handler(void *os, int msg, int pid, unsigned long arg)
work->msg = msg;
work->pid = pid;
work->arg = arg;
work->resp_pa = resp_pa;
INIT_WORK(&work->work, &procfsm_work_main);
schedule_work(&work->work);