From: Thomas Veerman <thomas@minix3.org>
Date: Fri, 30 Mar 2012 09:24:44 +0000 (+0000)
Subject: VFS: enable sending control messages
X-Git-Tag: v3.2.1~601
X-Git-Url: http://zhaoyanbai.com/repos/readme1st.txt?a=commitdiff_plain;h=0d63d9e125f291bca8676d2bf6e06f93549e29eb;p=minix.git

VFS: enable sending control messages
---

diff --git a/common/include/sys/svrctl.h b/common/include/sys/svrctl.h
index 2d1f69bdf..1bdad0e33 100644
--- a/common/include/sys/svrctl.h
+++ b/common/include/sys/svrctl.h
@@ -18,6 +18,10 @@ Created:	Feb 15, 1994 by Philip Homburg <philip@cs.vu.nl>
 #define PMGETPARAM	_IOW('M',  5, struct sysgetenv)
 #define PMSETPARAM	_IOR('M',  7, struct sysgetenv)
 
+/* VFS controls */
+#define VFSSETPARAM	_IOR('M', 130, struct sysgetenv)
+#define VFSGETPARAM	_IOR('M', 131, struct sysgetenv)
+
 struct sysgetenv {
 	char		*key;		/* Name requested. */
 	size_t		keylen;		/* Length of name including \0. */
diff --git a/servers/vfs/glo.h b/servers/vfs/glo.h
index e2603ae62..ac35c6d94 100644
--- a/servers/vfs/glo.h
+++ b/servers/vfs/glo.h
@@ -14,6 +14,7 @@ EXTERN int nr_locks;		/* number of locks currently in place */
 EXTERN int reviving;		/* number of pipe processes to be revived */
 EXTERN int pending;
 EXTERN int sending;
+EXTERN int verbose;
 
 EXTERN dev_t ROOT_DEV;		/* device number of the root device */
 EXTERN int ROOT_FS_E;           /* kernel endpoint of the root FS proc */
diff --git a/servers/vfs/main.c b/servers/vfs/main.c
index 4e5791e49..97883d3f1 100644
--- a/servers/vfs/main.c
+++ b/servers/vfs/main.c
@@ -486,6 +486,7 @@ static int sef_cb_init_fresh(int UNUSED(type), sef_init_info_t *info)
   force_sync = 0;
   receive_from = ANY;
   self = NULL;
+  verbose = 0;
 
   /* Initialize proc endpoints to NONE */
   for (rfp = &fproc[0]; rfp < &fproc[NR_PROCS]; rfp++) {
diff --git a/servers/vfs/misc.c b/servers/vfs/misc.c
index e4aaf181c..c394c893e 100644
--- a/servers/vfs/misc.c
+++ b/servers/vfs/misc.c
@@ -595,11 +595,81 @@ int ruid;
 int do_svrctl()
 {
   int svrctl;
+  vir_bytes ptr;
 
-  svrctl = m_in.svrctl_req;
+  svrctl = job_m_in.svrctl_req;
+  ptr = (vir_bytes) job_m_in.svrctl_argp;
+  if (((svrctl >> 8) & 0xFF) != 'M') return(EINVAL);
 
   switch (svrctl) {
-  /* No control request implemented yet. */
+    case VFSSETPARAM:
+    case VFSGETPARAM:
+	{
+		struct sysgetenv sysgetenv;
+		char search_key[64];
+		char val[64];
+		int r, s;
+
+		/* Copy sysgetenv structure to VFS */
+		if (sys_datacopy(who_e, ptr, SELF, (vir_bytes) &sysgetenv,
+				 sizeof(sysgetenv)) != OK)
+			return(EFAULT);
+
+		/* Basic sanity checking */
+		if (svrctl == VFSSETPARAM) {
+			if (sysgetenv.keylen <= 0 ||
+			    sysgetenv.keylen > (sizeof(search_key) - 1) ||
+			    sysgetenv.vallen <= 0 ||
+			    sysgetenv.vallen >= sizeof(val)) {
+				return(EINVAL);
+			}
+		}
+
+		/* Copy parameter "key" */
+		if ((s = sys_datacopy(who_e, (vir_bytes) sysgetenv.key,
+				      SELF, (vir_bytes) search_key,
+				      sysgetenv.keylen)) != OK)
+			return(s);
+		search_key[sysgetenv.keylen] = '\0'; /* Limit string */
+
+		/* Is it a parameter we know? */
+		if (svrctl == VFSSETPARAM) {
+			if (!strcmp(search_key, "verbose")) {
+				int verbose_val;
+				if ((s = sys_datacopy(who_e,
+				    (vir_bytes) sysgetenv.val, SELF,
+				    (vir_bytes) &val, sysgetenv.vallen)) != OK)
+					return(s);
+				val[sysgetenv.vallen] = '\0'; /* Limit string */
+				verbose_val = atoi(val);
+				if (verbose_val < 0 || verbose_val > 4) {
+					return(EINVAL);
+				}
+				verbose = verbose_val;
+				r = OK;
+			} else {
+				r = ESRCH;
+			}
+		} else { /* VFSGETPARAM */
+			if (!strcmp(search_key, "print_traces")) {
+				mthread_stacktraces();
+				sysgetenv.val = 0;
+				sysgetenv.vallen = 0;
+				r = OK;
+			} else {
+				r = ESRCH;
+			}
+
+			if (r == OK) {
+				if ((s = sys_datacopy(SELF,
+				    (vir_bytes) &sysgetenv, who_e, ptr,
+				    sizeof(sysgetenv))) != OK)
+					return(s);
+			}
+		}
+
+		return(r);
+	}
     default:
 	return(EINVAL);
   }