From: Ben Gras <ben@minix3.org>
Date: Wed, 12 Oct 2005 15:01:23 +0000 (+0000)
Subject: If processes are blocked on device drivers (returning SUSPEND),
X-Git-Tag: v3.1.2a~639
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zpipe.c?a=commitdiff_plain;h=2eca6f937459d04ae2a4e476ace824fa6e8c0730;p=minix.git

If processes are blocked on device drivers (returning SUSPEND),
unblock the processes when the device drivers die.
---

diff --git a/servers/fs/misc.c b/servers/fs/misc.c
index 5841a4d05..5bfbf1d56 100644
--- a/servers/fs/misc.c
+++ b/servers/fs/misc.c
@@ -339,8 +339,11 @@ PUBLIC int do_exit()
   fp->fp_rootdir = NIL_INODE;
   fp->fp_workdir = NIL_INODE;
 
-  /* If a driver exits, unmap its entries in the dmap table. */
+  /* If a driver exits, unmap its entries in the dmap table.
+   * Also check if any process is SUSPENDed on it.
+   */
   dmap_unmap_by_proc(exitee);
+  unsuspend_by_proc(exitee);
 
   /* If a session leader exits then revoke access to its controlling tty from
    * all other processes using it.
diff --git a/servers/fs/pipe.c b/servers/fs/pipe.c
index bb9f9341c..ec9855f51 100644
--- a/servers/fs/pipe.c
+++ b/servers/fs/pipe.c
@@ -194,6 +194,25 @@ int task;			/* who is proc waiting for? (PIPE = pipe) */
   }
 }
 
+/*===========================================================================*
+ *				unsuspend_by_proc			     *
+ *===========================================================================*/
+void unsuspend_by_proc(int proc)
+{
+  struct fproc *rp;
+  int client = 0;
+
+  /* Revive processes waiting for drivers (SUSPENDed) that have
+   * disappeared with return code EIO.
+   */
+  for (rp = &fproc[0]; rp < &fproc[NR_PROCS]; rp++, client++)
+	if(rp->fp_suspended == SUSPENDED && rp->fp_task == -proc)
+		revive(client, EIO);
+
+  return;
+}
+
+
 /*===========================================================================*
  *				release					     *
  *===========================================================================*/
diff --git a/servers/fs/proto.h b/servers/fs/proto.h
index f41315cbb..474880e32 100644
--- a/servers/fs/proto.h
+++ b/servers/fs/proto.h
@@ -15,7 +15,6 @@ _PROTOTYPE( void free_zone, (Dev_t dev, zone_t numb)			);
 _PROTOTYPE( struct buf *get_block, (Dev_t dev, block_t block,int only_search));
 _PROTOTYPE( void invalidate, (Dev_t device)				);
 _PROTOTYPE( void put_block, (struct buf *bp, int block_type)		);
-_PROTOTYPE( void rw_block, (struct buf *bp, int rw_flag)		);
 _PROTOTYPE( void rw_scattered, (Dev_t dev,
 			struct buf **bufq, int bufqsize, int rw_flag)	);
 
@@ -127,6 +126,7 @@ _PROTOTYPE( void suspend, (int task)					);
 _PROTOTYPE( int select_request_pipe, (struct filp *f, int *ops, int bl)	);
 _PROTOTYPE( int select_cancel_pipe, (struct filp *f)			);
 _PROTOTYPE( int select_match_pipe, (struct filp *f)			);
+_PROTOTYPE( void unsuspend_by_proc, (int)				);
 
 /* protect.c */
 _PROTOTYPE( int do_access, (void)					);