48c6bb79f4
SYSLIB CHANGES: - DS calls to publish / retrieve labels consider endpoints instead of u32_t. VFS CHANGES: - mapdriver() only adds an entry in the dmap table in VFS. - dev_up() is only executed upon reception of a driver up event. INET CHANGES: - INET no longer searches for existing drivers instances at startup. - A newtwork driver is (re)initialized upon reception of a driver up event. - Networking startup is now race-free by design. No need to waste 5 seconds at startup any more. DRIVER CHANGES: - Every driver publishes driver up events when starting for the first time or in case of restart when recovery actions must be taken in the upper layers. - Driver up events are published by drivers through DS. - For regular drivers, VFS is normally the only subscriber, but not necessarily. For instance, when the filter driver is in use, it must subscribe to driver up events to initiate recovery. - For network drivers, inet is the only subscriber for now. - Every VFS driver is statically linked with libdriver, every network driver is statically linked with libnetdriver. DRIVER LIBRARIES CHANGES: - Libdriver is extended to provide generic receive() and ds_publish() interfaces for VFS drivers. - driver_receive() is a wrapper for sef_receive() also used in driver_task() to discard spurious messages that were meant to be delivered to a previous version of the driver. - driver_receive_mq() is the same as driver_receive() but integrates support for queued messages. - driver_announce() publishes a driver up event for VFS drivers and marks the driver as initialized and expecting a DEV_OPEN message. - Libnetdriver is introduced to provide similar receive() and ds_publish() interfaces for network drivers (netdriver_announce() and netdriver_receive()). - Network drivers all support live update with no state transfer now. KERNEL CHANGES: - Added kernel call statectl for state management. Used by driver_announce() to unblock eventual callers sendrecing to the driver.
166 lines
5 KiB
C
166 lines
5 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_UPDATE
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*
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* The parameters for this kernel call are:
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* m2_i1: SYS_UPD_SRC_ENDPT (source process endpoint)
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* m2_i2: SYS_UPD_DST_ENDPT (destination process endpoint)
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*/
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#include "kernel/system.h"
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#include "kernel/ipc.h"
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#include <string.h>
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#if USE_UPDATE
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#define DEBUG 0
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#define proc_is_updatable(p) \
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(RTS_ISSET(p, RTS_NO_PRIV) || RTS_ISSET(p, RTS_SIG_PENDING) \
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|| (RTS_ISSET(p, RTS_RECEIVING) && !RTS_ISSET(p, RTS_SENDING)))
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FORWARD _PROTOTYPE(void adjust_proc_slot, (struct proc *rp,
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struct proc *from_rp));
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FORWARD _PROTOTYPE(void adjust_priv_slot, (struct priv *privp,
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struct priv *from_privp));
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FORWARD _PROTOTYPE(void swap_proc_slot_pointer, (struct proc **rpp,
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struct proc *src_rp, struct proc *dst_rp));
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/*===========================================================================*
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* do_update *
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*===========================================================================*/
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PUBLIC int do_update(struct proc * caller, message * m_ptr)
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{
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/* Handle sys_update(). Update a process into another by swapping their process
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* slots.
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*/
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endpoint_t src_e, dst_e;
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int src_p, dst_p;
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struct proc *src_rp, *dst_rp;
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struct priv *src_privp, *dst_privp;
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struct proc orig_src_proc;
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struct proc orig_dst_proc;
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struct priv orig_src_priv;
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struct priv orig_dst_priv;
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/* Lookup slots for source and destination process. */
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src_e = m_ptr->SYS_UPD_SRC_ENDPT;
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if(!isokendpt(src_e, &src_p)) {
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return EINVAL;
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}
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src_rp = proc_addr(src_p);
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src_privp = priv(src_rp);
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if(!(src_privp->s_flags & SYS_PROC)) {
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return EPERM;
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}
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dst_e = m_ptr->SYS_UPD_DST_ENDPT;
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if(!isokendpt(dst_e, &dst_p)) {
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return EINVAL;
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}
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dst_rp = proc_addr(dst_p);
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dst_privp = priv(dst_rp);
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if(!(dst_privp->s_flags & SYS_PROC)) {
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return EPERM;
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}
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/* Check if processes are updatable. */
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if(!proc_is_updatable(src_rp) || !proc_is_updatable(dst_rp)) {
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return EBUSY;
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}
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#if DEBUG
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printf("do_update: updating %d (%s, %d, %d) into %d (%s, %d, %d)\n",
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src_rp->p_endpoint, src_rp->p_name, src_rp->p_nr, priv(src_rp)->s_proc_nr,
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dst_rp->p_endpoint, dst_rp->p_name, dst_rp->p_nr, priv(dst_rp)->s_proc_nr);
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proc_stacktrace(src_rp);
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proc_stacktrace(dst_rp);
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printf("do_update: curr ptproc %d\n", ptproc->p_endpoint);
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#endif
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/* Save existing data. */
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orig_src_proc = *src_rp;
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orig_src_priv = *(priv(src_rp));
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orig_dst_proc = *dst_rp;
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orig_dst_priv = *(priv(dst_rp));
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/* Swap slots. */
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*src_rp = orig_dst_proc;
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*src_privp = orig_dst_priv;
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*dst_rp = orig_src_proc;
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*dst_privp = orig_src_priv;
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/* Adjust process slots. */
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adjust_proc_slot(src_rp, &orig_src_proc);
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adjust_proc_slot(dst_rp, &orig_dst_proc);
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/* Adjust privilege slots. */
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adjust_priv_slot(priv(src_rp), &orig_src_priv);
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adjust_priv_slot(priv(dst_rp), &orig_dst_priv);
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/* Swap global process slot addresses. */
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swap_proc_slot_pointer(&ptproc, src_rp, dst_rp);
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/* Fix segments. */
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alloc_segments(src_rp);
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alloc_segments(dst_rp);
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prot_init();
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#if DEBUG
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printf("do_update: updated %d (%s, %d, %d) into %d (%s, %d, %d)\n",
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src_rp->p_endpoint, src_rp->p_name, src_rp->p_nr, priv(src_rp)->s_proc_nr,
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dst_rp->p_endpoint, dst_rp->p_name, dst_rp->p_nr, priv(dst_rp)->s_proc_nr);
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proc_stacktrace(src_rp);
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proc_stacktrace(dst_rp);
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printf("do_update: curr ptproc %d\n", ptproc->p_endpoint);
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#endif
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return OK;
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}
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/*===========================================================================*
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* adjust_proc_slot *
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*===========================================================================*/
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PRIVATE void adjust_proc_slot(struct proc *rp, struct proc *from_rp)
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{
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/* Preserve endpoints, slot numbers, priv structure, and IPC. */
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rp->p_endpoint = from_rp->p_endpoint;
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rp->p_nr = from_rp->p_nr;
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rp->p_priv = from_rp->p_priv;
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priv(rp)->s_proc_nr = from_rp->p_nr;
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rp->p_misc_flags |= (from_rp->p_misc_flags & MF_ASYNMSG);
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rp->p_caller_q = from_rp->p_caller_q;
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}
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/*===========================================================================*
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* adjust_priv_slot *
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*===========================================================================*/
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PRIVATE void adjust_priv_slot(struct priv *privp, struct priv *from_privp)
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{
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/* Preserve privilege ids and non-privilege stuff in the priv structure. */
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privp->s_id = from_privp->s_id;
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privp->s_notify_pending = from_privp->s_notify_pending;
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privp->s_int_pending = from_privp->s_int_pending;
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privp->s_sig_pending = from_privp->s_sig_pending;
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privp->s_alarm_timer = from_privp->s_alarm_timer;
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memcpy(privp->s_farmem, from_privp->s_farmem, sizeof(privp->s_farmem));
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}
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/*===========================================================================*
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* swap_proc_slot_pointer *
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*===========================================================================*/
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PRIVATE void swap_proc_slot_pointer(struct proc **rpp, struct proc *src_rp,
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struct proc *dst_rp)
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{
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if(*rpp == src_rp) {
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*rpp = dst_rp;
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}
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else if(*rpp == dst_rp) {
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*rpp = src_rp;
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}
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}
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#endif /* USE_UPDATE */
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