From: Thomas Veerman <thomas@minix3.org>
Date: Thu, 15 Sep 2011 15:39:13 +0000 (+0000)
Subject: Cleanup more resources upon exit
X-Git-Tag: v3.2.0~306
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/Bv9ARM.ch08.html?a=commitdiff_plain;h=90cde23c196f09dc0cdc48c586259ab95500267d;p=minix.git

Cleanup more resources upon exit
---

diff --git a/servers/avfs/main.c b/servers/avfs/main.c
index a47ea73c7..61e3ac525 100644
--- a/servers/avfs/main.c
+++ b/servers/avfs/main.c
@@ -343,7 +343,7 @@ PRIVATE void *do_pending_pipe(void *arg)
 	      fp->fp_buffer, fp->fp_nbytes);
 
   if (r != SUSPEND)  /* Do we have results to report? */
-	(void) reply(who_e, r);
+	reply(who_e, r);
 
   unlock_filp(f);
 
@@ -431,18 +431,7 @@ PRIVATE void *do_work(void *arg)
 		if (fp->fp_wtid == dl_worker.w_tid)
 			deadlock_resolving = 0;
 	}
-	if (reply(who_e, error) != OK) {
-		if ((vmp = find_vmnt(who_e)) != NULL) {
-			for (i = 0; i < NR_PROCS; i++) {
-				rfp = &fproc[i];
-				if (rfp->fp_task == vmp->m_fs_e) {
-					/* We found a process waiting for a
-					 * reply from non-responsive FS */
-					worker_stop(worker_get(rfp->fp_wtid));
-				}
-			}
-		}
-	}
+	reply(who_e, error);
   }
 
   thread_cleanup(fp);
@@ -764,7 +753,7 @@ PRIVATE void get_work()
 /*===========================================================================*
  *				reply					     *
  *===========================================================================*/
-PUBLIC int reply(whom, result)
+PUBLIC void reply(whom, result)
 int whom;			/* process to reply to */
 int result;			/* result of the call (usually OK or error #) */
 {
@@ -776,7 +765,6 @@ int result;			/* result of the call (usually OK or error #) */
   if (r != OK) {
 	printf("VFS: couldn't send reply %d to %d: %d\n", result, whom, r);
   }
-  return(r);
 }
 
 /*===========================================================================*
diff --git a/servers/avfs/misc.c b/servers/avfs/misc.c
index 092078c05..9ecee81eb 100644
--- a/servers/avfs/misc.c
+++ b/servers/avfs/misc.c
@@ -457,6 +457,8 @@ PRIVATE void free_proc(struct fproc *exiter, int flags)
    */
   unsuspend_by_endpt(exiter->fp_endpoint);
   dmap_unmap_by_endpt(exiter->fp_endpoint);
+  vmnt_unmap_by_endpt(exiter->fp_endpoint);
+  worker_stop_by_endpt(exiter->fp_endpoint);
 
   /* Release root and working directories. */
   if (exiter->fp_rd) { put_vnode(exiter->fp_rd); exiter->fp_rd = NULL; }
diff --git a/servers/avfs/proto.h b/servers/avfs/proto.h
index 9a327da78..207ede593 100644
--- a/servers/avfs/proto.h
+++ b/servers/avfs/proto.h
@@ -116,7 +116,7 @@ _PROTOTYPE( void lock_revive, (void)					);
 
 /* main.c */
 _PROTOTYPE( int main, (void)						);
-_PROTOTYPE( int reply, (int whom, int result)				);
+_PROTOTYPE( void reply, (int whom, int result)				);
 _PROTOTYPE( void lock_proc, (struct fproc *rfp, int force_lock)		);
 _PROTOTYPE( void unlock_proc, (struct fproc *rfp)			);
 _PROTOTYPE( void *do_dummy, (void *arg)					);
@@ -323,6 +323,7 @@ _PROTOTYPE( struct vmnt *get_locked_vmnt, (struct fproc *rfp)		);
 _PROTOTYPE( void init_vmnts, (void)					);
 _PROTOTYPE( int lock_vmnt, (struct vmnt *vp, tll_access_t locktype)	);
 _PROTOTYPE( void unlock_vmnt, (struct vmnt *vp)				);
+_PROTOTYPE( void vmnt_unmap_by_endpt, (endpoint_t proc_e)		);
 
 /* vnode.c */
 _PROTOTYPE( void check_vnode_locks, (void)				);
diff --git a/servers/avfs/request.c b/servers/avfs/request.c
index 25e309213..d1df5ef0c 100644
--- a/servers/avfs/request.c
+++ b/servers/avfs/request.c
@@ -556,6 +556,7 @@ PUBLIC int req_mknod(
 PUBLIC int req_mountpoint(endpoint_t fs_e, ino_t inode_nr)
 {
   message m;
+  int r;
 
   /* Fill in request message */
   m.m_type = REQ_MOUNTPOINT;
diff --git a/servers/avfs/vmnt.c b/servers/avfs/vmnt.c
index f391aa963..3202473f3 100644
--- a/servers/avfs/vmnt.c
+++ b/servers/avfs/vmnt.c
@@ -9,6 +9,7 @@
 #include "fproc.h"
 
 FORWARD _PROTOTYPE( int is_vmnt_locked, (struct vmnt *vmp)		);
+FORWARD _PROTOTYPE( void clear_vmnt, (struct vmnt *vmp)			);
 
 /* Is vmp pointer reasonable? */
 #define SANEVMP(v) ((((v) >= &vmnt[0] && (v) < &vmnt[NR_MNTS])))
@@ -58,6 +59,25 @@ PUBLIC void check_vmnt_locks()
 #endif
 }
 
+/*===========================================================================*
+ *                             clear_vmnt				     *
+ *===========================================================================*/
+PRIVATE void clear_vmnt(struct vmnt *vmp)
+{
+/* Reset vmp to initial parameters */
+  ASSERTVMP(vmp);
+
+  vmp->m_fs_e = NONE;
+  vmp->m_dev = NO_DEV;
+  vmp->m_flags = 0;
+  vmp->m_mounted_on = NULL;
+  vmp->m_root_node = NULL;
+  vmp->m_label[0] = '\0';
+  vmp->m_comm.c_max_reqs = 1;
+  vmp->m_comm.c_cur_reqs = 0;
+  vmp->m_comm.c_req_queue = NULL;
+}
+
 /*===========================================================================*
  *                             get_free_vmnt				     *
  *===========================================================================*/
@@ -92,19 +112,11 @@ PUBLIC struct vmnt *find_vmnt(endpoint_t fs_e)
 PUBLIC void init_vmnts(void)
 {
 /* Initialize vmnt table */
-  struct vmnt *vp;
+  struct vmnt *vmp;
 
-  for (vp = &vmnt[0]; vp < &vmnt[NR_MNTS]; vp++) {
-	vp->m_fs_e = NONE;
-	vp->m_dev = NO_DEV;
-	vp->m_flags = 0;
-	vp->m_mounted_on = NULL;
-	vp->m_root_node = NULL;
-	vp->m_label[0] = '\0';
-	vp->m_comm.c_max_reqs = 1;
-	vp->m_comm.c_cur_reqs = 0;
-	vp->m_comm.c_req_queue = NULL;
-	tll_init(&vp->m_lock);
+  for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; vmp++) {
+	clear_vmnt(vmp);
+	tll_init(&vmp->m_lock);
   }
 }
 
@@ -168,3 +180,15 @@ PUBLIC void unlock_vmnt(struct vmnt *vmp)
 #endif
 
 }
+
+/*===========================================================================*
+ *                             vmnt_unmap_by_endpoint			     *
+ *===========================================================================*/
+PUBLIC void vmnt_unmap_by_endpt(endpoint_t proc_e)
+{
+  struct vmnt *vmp;
+
+  if ((vmp = find_vmnt(proc_e)) != NULL)
+	clear_vmnt(vmp);
+
+}
diff --git a/servers/avfs/worker.c b/servers/avfs/worker.c
index e5ae0c0e8..b83a044d3 100644
--- a/servers/avfs/worker.c
+++ b/servers/avfs/worker.c
@@ -11,6 +11,8 @@ FORWARD _PROTOTYPE( void get_work, (struct worker_thread *worker)	);
 FORWARD _PROTOTYPE( void *worker_main, (void *arg)			);
 FORWARD _PROTOTYPE( void worker_sleep, (struct worker_thread *worker)	);
 FORWARD _PROTOTYPE( void worker_wake, (struct worker_thread *worker)	);
+FORWARD _PROTOTYPE( int worker_waiting_for, (struct worker_thread *worker,
+						endpoint_t proc_e)	);
 PRIVATE int init = 0;
 PRIVATE mthread_attr_t tattr;
 
@@ -26,7 +28,7 @@ PRIVATE mthread_attr_t tattr;
 /*===========================================================================*
  *				worker_init				     *
  *===========================================================================*/
-PUBLIC void worker_init(struct worker_thread *worker)
+PUBLIC void worker_init(struct worker_thread *wp)
 {
 /* Initialize worker thread */
   if (!init) {
@@ -40,13 +42,13 @@ PUBLIC void worker_init(struct worker_thread *worker)
 	init = 1;
   }
 
-  ASSERTW(worker);
+  ASSERTW(wp);
 
-  worker->w_job.j_func = NULL;		/* Mark not in use */
-  worker->w_next = NULL;
-  assert(mutex_init(&worker->w_event_mutex, NULL) == 0);
-  assert(cond_init(&worker->w_event, NULL) == 0);
-  assert(mthread_create(&worker->w_tid, &tattr, worker_main, (void *) worker) == 0);
+  wp->w_job.j_func = NULL;		/* Mark not in use */
+  wp->w_next = NULL;
+  assert(mutex_init(&wp->w_event_mutex, NULL) == 0);
+  assert(cond_init(&wp->w_event, NULL) == 0);
+  assert(mthread_create(&wp->w_tid, &tattr, worker_main, (void *) wp) == 0);
   yield();
 }
 
@@ -292,10 +294,30 @@ PUBLIC void worker_signal(struct worker_thread *worker)
 PUBLIC void worker_stop(struct worker_thread *worker)
 {
   ASSERTW(worker);		/* Make sure we have a valid thread */
-  worker->w_job.j_m_in.m_type = -EIO;
+  worker->w_job.j_m_in.m_type = EIO;
   worker_wake(worker);
 }
 
+/*===========================================================================*
+ *				worker_stop_by_endpt			     *
+ *===========================================================================*/
+PUBLIC void worker_stop_by_endpt(endpoint_t proc_e)
+{
+  struct worker_thread *worker;
+  int i;
+
+  if (proc_e == NONE) return;
+
+  if (worker_waiting_for(&sys_worker, proc_e)) worker_stop(&sys_worker);
+  if (worker_waiting_for(&dl_worker, proc_e)) worker_stop(&dl_worker);
+
+  for (i = 0; i < NR_WTHREADS; i++) {
+	worker = &workers[i];
+	if (worker_waiting_for(worker, proc_e))
+		worker_stop(worker);
+  }
+}
+
 /*===========================================================================*
  *				worker_self				     *
  *===========================================================================*/
@@ -344,3 +366,19 @@ PUBLIC struct job *worker_getjob(thread_t worker_tid)
 
   return(NULL);
 }
+
+/*===========================================================================*
+ *				worker_waiting_for			     *
+ *===========================================================================*/
+PRIVATE int worker_waiting_for(struct worker_thread *worker, endpoint_t proc_e)
+{
+  ASSERTW(worker);		/* Make sure we have a valid thread */
+
+  if (worker->w_job.j_func != NULL) {
+	if (worker->w_job.j_fp != NULL) {
+		return(worker->w_job.j_fp->fp_task == proc_e);
+	}
+  }
+
+  return(0);
+}