Add refcounts to the "global" DEVFS inode slots, this allows us

to recycle inodes after a destroy_dev() but not until all mounts
have picked up the change.

Add support for an overflow table for DEVFS inodes.  The static
table defaults to 1024 inodes, if that fills, an overflow table
of 32k inodes is allocated.  Both numbers can be changed at
compile time, the size of the overflow table also with the
sysctl vfs.devfs.noverflow.

Use atomic instructions to barrier between make_dev()/destroy_dev()
and the mounts.

Add lockmgr() locking of directories for operations accessing or
modifying the directory TAILQs.

Various nitpicking here and there.

1 files changed, 4 insertions, 4 deletions

diff --git a/sys/fs/devfs/devfs_vfsops.c b/sys/fs/devfs/devfs_vfsops.c
index 72f2630..131fd47 100644
--- a/sys/fs/devfs/devfs_vfsops.c
+++ b/sys/fs/devfs/devfs_vfsops.c
@@ -34,6 +34,8 @@
  * $FreeBSD$
  */
 
+#include "opt_devfs.h"
+
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/kernel.h>
@@ -41,9 +43,7 @@
 #include <sys/vnode.h>
 #include <sys/mount.h>
 #include <sys/malloc.h>
-#include <sys/eventhandler.h>
 
-#define DEVFS_INTERN
 #include <fs/devfs/devfs.h>
 
 MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data");
@@ -82,12 +82,13 @@ devfs_mount(mp, path, data, ndp, p)
 	MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount),
 	    M_DEVFS, M_WAITOK);
 	bzero(fmp, sizeof(*fmp));
+	lockinit(&fmp->dm_lock, PVFS, "devfs", 0, LK_NOPAUSE);
 
 	mp->mnt_flag |= MNT_LOCAL;
 	mp->mnt_data = (qaddr_t) fmp;
 	vfs_getnewfsid(mp);
 
-	fmp->dm_inode = NDEVINO;
+	fmp->dm_inode = DEVFSINOMOUNT;
 
 	fmp->dm_rootdir = devfs_vmkdir("(root)", 6, NULL);
 	fmp->dm_rootdir->de_inode = 2;
@@ -110,7 +111,6 @@ devfs_mount(mp, path, data, ndp, p)
 	bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
 	bcopy("devfs", mp->mnt_stat.f_mntfromname, sizeof("devfs"));
 	(void)devfs_statfs(mp, &mp->mnt_stat, p);
-	devfs_populate(fmp);
 
 	return (0);
 }