Add the ffs bits necessary to support unloading of the ufs kernel

module. This adds an ffs_uninit() function that calls ufs_uninit()
and also calls a new softdep_uninitialize() function. Add a stub
for softdep_uninitialize() to cover the non-SOFTUPDATES case.

Reviewed by:	mckusick

4 files changed, 38 insertions, 2 deletions

diff --git a/sys/ufs/ffs/ffs_extern.h b/sys/ufs/ffs/ffs_extern.h
index 8274765..ae59ca3 100644
--- a/sys/ufs/ffs/ffs_extern.h
+++ b/sys/ufs/ffs/ffs_extern.h
@@ -106,6 +106,7 @@ extern vop_t **ffs_fifoop_p;
  * Soft update function prototypes.
  */
 void	softdep_initialize(void);
+void	softdep_uninitialize(void);
 int	softdep_mount(struct vnode *, struct mount *, struct fs *,
 	    struct ucred *);
 int	softdep_flushworklist(struct mount *, int *, struct thread *);
diff --git a/sys/ufs/ffs/ffs_softdep.c b/sys/ufs/ffs/ffs_softdep.c
index 0fc1848..4921344 100644
--- a/sys/ufs/ffs/ffs_softdep.c
+++ b/sys/ufs/ffs/ffs_softdep.c
@@ -1132,6 +1132,19 @@ softdep_initialize()
 }
 
 /*
+ * Executed after all filesystems have been unmounted during
+ * filesystem module unload.
+ */
+void
+softdep_uninitialize()
+{
+
+	hashdestroy(pagedep_hashtbl, M_PAGEDEP, pagedep_hash);
+	hashdestroy(inodedep_hashtbl, M_INODEDEP, inodedep_hash);
+	hashdestroy(newblk_hashtbl, M_NEWBLK, newblk_hash);
+}
+
+/*
  * Called at mount time to notify the dependency code that a
  * filesystem wishes to use it.
  */
diff --git a/sys/ufs/ffs/ffs_softdep_stub.c b/sys/ufs/ffs/ffs_softdep_stub.c
index 47feaec..df084c7 100644
--- a/sys/ufs/ffs/ffs_softdep_stub.c
+++ b/sys/ufs/ffs/ffs_softdep_stub.c
@@ -83,6 +83,13 @@ softdep_initialize()
 }
 
 void
+softdep_uninitialize()
+{
+
+	return;
+}
+
+void
 softdep_setup_inomapdep(bp, ip, newinum)
 	struct buf *bp;
 	struct inode *ip;
diff --git a/sys/ufs/ffs/ffs_vfsops.c b/sys/ufs/ffs/ffs_vfsops.c
index 61cec1f..fa0bffa 100644
--- a/sys/ufs/ffs/ffs_vfsops.c
+++ b/sys/ufs/ffs/ffs_vfsops.c
@@ -73,6 +73,7 @@ static void	ffs_oldfscompat_read(struct fs *, struct ufsmount *,
 		    ufs2_daddr_t);
 static void	ffs_oldfscompat_write(struct fs *, struct ufsmount *);
 static int	ffs_init(struct vfsconf *);
+static int	ffs_uninit(struct vfsconf *);
 
 static struct vfsops ufs_vfsops = {
 	ffs_mount,
@@ -87,7 +88,7 @@ static struct vfsops ufs_vfsops = {
 	vfs_stdcheckexp,
 	ffs_vptofh,
 	ffs_init,
-	vfs_stduninit,
+	ffs_uninit,
 #ifdef UFS_EXTATTR
 	ufs_extattrctl,
 #else
@@ -1375,7 +1376,7 @@ ffs_vptofh(vp, fhp)
 }
 
 /*
- * Initialize the filesystem; just use ufs_init.
+ * Initialize the filesystem.
  */
 static int
 ffs_init(vfsp)
@@ -1387,6 +1388,20 @@ ffs_init(vfsp)
 }
 
 /*
+ * Undo the work of ffs_init().
+ */
+static int
+ffs_uninit(vfsp)
+	struct vfsconf *vfsp;
+{
+	int ret;
+
+	ret = ufs_uninit(vfsp);
+	softdep_uninitialize();
+	return (ret);
+}
+
+/*
  * Write a superblock and associated information back to disk.
  */
 static int