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Is there anywhere TMPFS cannot replace MFS, and work at least as well?
If not, is it ok if we begin to phase MFS out?

I believe the only part of the system that depends on MFS is init(8).
If init(8) finds /dev/console missing, it creates /dev/ and runs MAKEDEV
in it.  I have attached a patch that makes init(8) use TMPFS, instead.

I will commit this within the next couple weeks unless I hear serious
concerns.

Dave

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David Young             OJC Technologies
dyoung@ojctech.com      Urbana, IL * (217) 278-3933

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Index: init.c
===================================================================
RCS file: /cvsroot/src/sbin/init/init.c,v
retrieving revision 1.88
diff -p -u -u -p -r1.88 init.c
--- init.c	15 Feb 2007 22:39:12 -0000	1.88
+++ init.c	15 Feb 2007 23:29:58 -0000
@@ -93,11 +93,11 @@ const struct timespec dtrtime = {.tv_sec
 
 #if defined(RESCUEDIR)
 #define	INIT_BSHELL	RESCUEDIR "/sh"
-#define	INIT_MOUNT_MFS	RESCUEDIR "/mount_mfs"
+#define	INIT_MOUNT_TMPFS	RESCUEDIR "/mount_tmpfs"
 #define	INIT_PATH	RESCUEDIR ":" _PATH_STDPATH
 #else
 #define	INIT_BSHELL	_PATH_BSHELL
-#define	INIT_MOUNT_MFS	"/sbin/mount_mfs"
+#define	INIT_MOUNT_TMPFS	"/sbin/mount_tmpfs"
 #define	INIT_PATH	_PATH_STDPATH
 #endif
 
@@ -212,12 +212,7 @@ state_t requested_transition = single_us
 #ifdef MFS_DEV_IF_NO_CONSOLE
 
 #define NINODE 1280
-#define FSSIZE ((8192		/* boot area */				\
-	+ 2 * 8192		/* two copies of superblock */		\
-	+ 4096			/* cylinder group info */		\
-	+ NINODE * (128 + 18)	/* inode and directory entry */		\
-	+ mfile[0].len		/* size of MAKEDEV file */		\
-	+ 2 * 4096) / 512)	/* some slack */
+#define FSSIZE (400 * NINODE)
 
 struct mappedfile {
 	const char *path;
@@ -228,7 +223,7 @@ struct mappedfile {
 	{ "/dev/MAKEDEV.local",	NULL,	0 }
 };
 
-static int mfs_dev(void);
+static int tmpfs_dev(void);
 static void mapfile(struct mappedfile *);
 static void writefile(struct mappedfile *);
 
@@ -275,7 +270,7 @@ main(int argc, char **argv)
 
 
 #ifdef MFS_DEV_IF_NO_CONSOLE
-	if (mfs_dev() == -1)
+	if (tmpfs_dev() == -1)
 		requested_transition = single_user;
 #endif
 
@@ -1671,7 +1666,7 @@ writefile(struct mappedfile *mf)
 }
 
 static int
-mfs_dev(void)
+tmpfs_dev(void)
 {
 	/*
 	 * We cannot print errors so we bail out silently...
@@ -1695,16 +1690,15 @@ mfs_dev(void)
 	/* Grab the contents of MAKEDEV.local */
 	mapfile(&mfile[1]);
 
-	/* Mount an mfs over /dev so we can create devices */
+	/* Mount an tmpfs over /dev so we can create devices */
 	switch ((pid = fork())) {
 	case 0:
 		(void)asprintf(&fs_size, "%zu", FSSIZE);
 		if (fs_size == NULL)
 			return(-1);
-		(void)execl(INIT_MOUNT_MFS, "mount_mfs",
-		    "-b", "4096", "-f", "512",
+		(void)execl(INIT_MOUNT_TMPFS, "mount_tmpfs",
 		    "-s", fs_size, "-n", STR(NINODE),
-		    "-p", "0755",
+		    "-m", "0755",
 		    "swap", "/dev", NULL);
 		_exit(1);
 		/*NOTREACHED*/
@@ -1733,12 +1727,12 @@ mfs_dev(void)
 
 	(void)freopen(_PATH_CONSOLE, "a", stderr);
 
-	warnx("Creating mfs /dev (%zu blocks, %d inodes)", FSSIZE, NINODE);
+	warnx("Creating tmpfs /dev (%zu blocks, %d inodes)", FSSIZE, NINODE);
 
-	/* Create a MAKEDEV script in the mfs /dev */
+	/* Create a MAKEDEV script in the tmpfs /dev */
 	writefile(&mfile[0]);
 
-	/* Create a MAKEDEV.local script in the mfs /dev */
+	/* Create a MAKEDEV.local script in the tmpfs /dev */
 	writefile(&mfile[1]);
 
 	/* Run the makedev script to create devices */

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