release/3.0.0

1 files changed, 169 insertions, 244 deletions

diff --git a/sys/kern/vfs_init.c b/sys/kern/vfs_init.c
index 43589c740a7e..39900c612c64 100644
--- a/sys/kern/vfs_init.c
+++ b/sys/kern/vfs_init.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)vfs_init.c	8.3 (Berkeley) 1/4/94
- * $Id: vfs_init.c,v 1.40 1998/11/15 15:18:30 bde Exp $
+ * $Id: vfs_init.c,v 1.34 1998/10/05 11:10:55 obrien Exp $
  */
 
 
@@ -49,10 +49,33 @@
 #include <sys/malloc.h>
 #include <vm/vm_zone.h>
 
+static void	vfs_op_init __P((void));
+
+static void vfsinit __P((void *));
+SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vfsinit, NULL)
 
 MALLOC_DEFINE(M_VNODE, "vnodes", "Dynamically allocated vnodes");
 
 /*
+ * Sigh, such primitive tools are these...
+ */
+#if 0
+#define DODEBUG(A) A
+#else
+#define DODEBUG(A)
+#endif
+
+static struct vfsconf void_vfsconf;
+
+#ifdef unused
+extern struct linker_set vfs_opv_descs_;
+#define vfs_opv_descs ((struct vnodeopv_desc **)vfs_opv_descs_.ls_items)
+#endif
+
+extern struct vnodeop_desc *vfs_op_descs[];
+				/* and the operations they perform */
+
+/*
  * XXX this bloat just exands the sysctl__vfs linker set a little so that
  * we can attach sysctls for VFS modules without expanding the linker set.
  * Currently (1998/09/06), only one VFS uses sysctls, so 2 extra linker
@@ -83,221 +106,133 @@ struct vm_zone *namei_zone;
  * listing those new operations Ficus adds to NFS, all without modifying the
  * NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but
  * that is a(whole)nother story.) This is a feature.
+ *
+ * Without an explicit reserve area, however, you must replace vnode_if.c
+ * and vnode_if.h when you do this, or you will be derefrencing of the
+ * end of vfs_op_descs[].  This is a flaw in the use of a structure
+ * pointer array rather than an agregate to define vfs_op_descs.  So
+ * it's not a very dynamic "feature".
  */
-
-/* Table of known vnodeop vectors (list of VFS vnode vectors) */
-static struct vnodeopv_desc **vnodeopv_descs;
-static int vnodeopv_num;
-
-/* Table of known descs (list of vnode op handlers "vop_access_desc") */
-static struct vnodeop_desc **vfs_op_descs;
-static int *vfs_op_desc_refs;			/* reference counts */
-static int num_op_descs;
-static int vfs_opv_numops;
-
-static void
-vfs_opv_recalc(void)
+void
+vfs_opv_init(struct vnodeopv_desc *opv)
 {
-	int i, j;
+	int j, k;
 	vop_t ***opv_desc_vector_p;
 	vop_t **opv_desc_vector;
 	struct vnodeopv_entry_desc *opve_descp;
-	struct vnodeopv_desc *opv;
-
-	if (vfs_op_descs == NULL)
-		panic("vfs_opv_recalc called with null vfs_op_descs");
 
 	/*
-	 * Run through and make sure all known descs have an offset
-	 *
-	 * vop_default_desc is hardwired at offset 1, and offset 0
-	 * is a panic sanity check.
+	 * Allocate the dynamic vectors and fill them in.
 	 */
-	vfs_opv_numops = 0;
-	for (i = 0; i < num_op_descs; i++)
-		if (vfs_opv_numops < (vfs_op_descs[i]->vdesc_offset + 1))
-			vfs_opv_numops = vfs_op_descs[i]->vdesc_offset + 1;
-	for (i = 0; i < num_op_descs; i++)
-		if (vfs_op_descs[i]->vdesc_offset == 0)
-			vfs_op_descs[i]->vdesc_offset = vfs_opv_numops++;
+	opv_desc_vector_p = opv->opv_desc_vector_p;
 	/*
-	 * Allocate and fill in the vectors
+	 * Allocate and init the vector, if it needs it.
+	 * Also handle backwards compatibility.
 	 */
-	for (i = 0; i < vnodeopv_num; i++) {
-		opv = vnodeopv_descs[i];
-		opv_desc_vector_p = opv->opv_desc_vector_p;
-		if (*opv_desc_vector_p)
-			FREE(*opv_desc_vector_p, M_VNODE);
+	if (*opv_desc_vector_p == NULL) {
+		/* XXX - shouldn't be M_VNODE */
 		MALLOC(*opv_desc_vector_p, vop_t **,
-		       vfs_opv_numops * sizeof(vop_t *), M_VNODE, M_WAITOK);
-		if (*opv_desc_vector_p == NULL)
-			panic("no memory for vop_t ** vector");
-		bzero(*opv_desc_vector_p, vfs_opv_numops * sizeof(vop_t *));
-
-		/* Fill in, with slot 0 being panic */
-		opv_desc_vector = *opv_desc_vector_p;
-		opv_desc_vector[0] = (vop_t *)vop_panic;
-		for (j = 0; opv->opv_desc_ops[j].opve_op; j++) {
-			opve_descp = &(opv->opv_desc_ops[j]);
-			opv_desc_vector[opve_descp->opve_op->vdesc_offset] =
-				opve_descp->opve_impl;
-		}
-
-		/* Replace unfilled routines with their default (slot 1). */
-		opv_desc_vector = *(opv->opv_desc_vector_p);
-		if (opv_desc_vector[1] == NULL)
-			panic("vfs_opv_recalc: vector without a default.");
-		for (j = 0; j < vfs_opv_numops; j++)
-			if (opv_desc_vector[j] == NULL)
-				opv_desc_vector[j] = opv_desc_vector[1];
+		       vfs_opv_numops * sizeof(vop_t *), M_VNODE,
+		       M_WAITOK);
+		bzero(*opv_desc_vector_p,
+		      vfs_opv_numops * sizeof(vop_t *));
+		DODEBUG(printf("vector at %x allocated\n",
+		    opv_desc_vector_p));
 	}
-}
+	opv_desc_vector = *opv_desc_vector_p;
+	for (j = 0; opv->opv_desc_ops[j].opve_op; j++) {
+		opve_descp = &(opv->opv_desc_ops[j]);
 
-void
-vfs_add_vnodeops(void *data)
-{
-	struct vnodeopv_desc *opv;
-	struct vnodeopv_desc **newopv;
-	struct vnodeop_desc **newop;
-	int *newref;
-	vop_t **opv_desc_vector;
-	struct vnodeop_desc *desc;
-	int i, j;
-
-	opv = (struct vnodeopv_desc *)data;
-	MALLOC(newopv, struct vnodeopv_desc **,
-	       (vnodeopv_num + 1) * sizeof(*newopv), M_VNODE, M_WAITOK);
-	if (newopv == NULL)
-		panic("vfs_add_vnodeops: no memory");
-	if (vnodeopv_descs) {
-		bcopy(vnodeopv_descs, newopv, vnodeopv_num * sizeof(*newopv));
-		FREE(vnodeopv_descs, M_VNODE);
+		/*
+		 * Sanity check:  is this operation listed
+		 * in the list of operations?  We check this
+		 * by seeing if its offest is zero.  Since
+		 * the default routine should always be listed
+		 * first, it should be the only one with a zero
+		 * offset.  Any other operation with a zero
+		 * offset is probably not listed in
+		 * vfs_op_descs, and so is probably an error.
+		 *
+		 * A panic here means the layer programmer
+		 * has committed the all-too common bug
+		 * of adding a new operation to the layer's
+		 * list of vnode operations but
+		 * not adding the operation to the system-wide
+		 * list of supported operations.
+		 */
+		if (opve_descp->opve_op->vdesc_offset == 0 &&
+			    opve_descp->opve_op->vdesc_offset !=
+				VOFFSET(vop_default)) {
+			printf("operation %s not listed in %s.\n",
+			    opve_descp->opve_op->vdesc_name,
+			    "vfs_op_descs");
+			panic ("vfs_opv_init: bad operation");
+		}
+		/*
+		 * Fill in this entry.
+		 */
+		opv_desc_vector[opve_descp->opve_op->vdesc_offset] =
+				opve_descp->opve_impl;
 	}
-	newopv[vnodeopv_num] = opv;
-	vnodeopv_descs = newopv;
-	vnodeopv_num++;
-
-	/* See if we have turned up a new vnode op desc */
+	/*
+	 * Finally, go back and replace unfilled routines
+	 * with their default.  (Sigh, an O(n^3) algorithm.  I
+	 * could make it better, but that'd be work, and n is small.)
+	 */
 	opv_desc_vector = *(opv->opv_desc_vector_p);
-	for (i = 0; (desc = opv->opv_desc_ops[i].opve_op); i++) {
-		for (j = 0; j < num_op_descs; j++) {
-			if (desc == vfs_op_descs[j]) {
-				/* found it, increase reference count */
-				vfs_op_desc_refs[j]++;
-				break;
-			}
-		}
-		if (j == num_op_descs) {
-			/* not found, new entry */
-			MALLOC(newop, struct vnodeop_desc **,
-			       (num_op_descs + 1) * sizeof(*newop),
-			       M_VNODE, M_WAITOK);
-			if (newop == NULL)
-				panic("vfs_add_vnodeops: no memory for desc");
-			/* new reference count (for unload) */
-			MALLOC(newref, int *,
-				(num_op_descs + 1) * sizeof(*newref),
-				M_VNODE, M_WAITOK);
-			if (newref == NULL)
-				panic("vfs_add_vnodeops: no memory for refs");
-			if (vfs_op_descs) {
-				bcopy(vfs_op_descs, newop,
-					num_op_descs * sizeof(*newop));
-				FREE(vfs_op_descs, M_VNODE);
-			}
-			if (vfs_op_desc_refs) {
-				bcopy(vfs_op_desc_refs, newref,
-					num_op_descs * sizeof(*newref));
-				FREE(vfs_op_desc_refs, M_VNODE);
-			}
-			newop[num_op_descs] = desc;
-			newref[num_op_descs] = 1;
-			vfs_op_descs = newop;
-			vfs_op_desc_refs = newref;
-			num_op_descs++;
-		}
+	/*
+	 * Force every operations vector to have a default routine.
+	 */
+	if (opv_desc_vector[VOFFSET(vop_default)]==NULL) {
+		panic("vfs_opv_init: operation vector without default routine.");
 	}
-	vfs_opv_recalc();
+	for (k = 0; k<vfs_opv_numops; k++)
+		if (opv_desc_vector[k] == NULL)
+			opv_desc_vector[k] =
+				opv_desc_vector[VOFFSET(vop_default)];
 }
 
-void
-vfs_rm_vnodeops(void *data)
+/*
+ * Initialize known vnode operations vectors.
+ */
+static void
+vfs_op_init()
 {
-	struct vnodeopv_desc *opv;
-	struct vnodeopv_desc **newopv;
-	struct vnodeop_desc **newop;
-	int *newref;
-	vop_t **opv_desc_vector;
-	struct vnodeop_desc *desc;
-	int i, j, k;
-
-	opv = (struct vnodeopv_desc *)data;
-	/* Lower ref counts on descs in the table and release if zero */
-	opv_desc_vector = *(opv->opv_desc_vector_p);
-	for (i = 0; (desc = opv->opv_desc_ops[i].opve_op); i++) {
-		for (j = 0; j < num_op_descs; j++) {
-			if (desc == vfs_op_descs[j]) {
-				/* found it, decrease reference count */
-				vfs_op_desc_refs[j]--;
-				break;
-			}
-		}
-		for (j = 0; j < num_op_descs; j++) {
-			if (vfs_op_desc_refs[j] > 0)
-				continue;
-			if (vfs_op_desc_refs[j] < 0)
-				panic("vfs_remove_vnodeops: negative refcnt");
-			MALLOC(newop, struct vnodeop_desc **,
-			       (num_op_descs - 1) * sizeof(*newop),
-			       M_VNODE, M_WAITOK);
-			if (newop == NULL)
-				panic("vfs_remove_vnodeops: no memory for desc");
-			/* new reference count (for unload) */
-			MALLOC(newref, int *,
-				(num_op_descs - 1) * sizeof(*newref),
-				M_VNODE, M_WAITOK);
-			if (newref == NULL)
-				panic("vfs_remove_vnodeops: no memory for refs");
-			for (k = j; k < (num_op_descs - 1); k++) {
-				vfs_op_descs[k] = vfs_op_descs[k + 1];
-				vfs_op_desc_refs[k] = vfs_op_desc_refs[k + 1];
-			}
-			bcopy(vfs_op_descs, newop,
-				(num_op_descs - 1) * sizeof(*newop));
-			bcopy(vfs_op_desc_refs, newref,
-				(num_op_descs - 1) * sizeof(*newref));
-			FREE(vfs_op_descs, M_VNODE);
-			FREE(vfs_op_desc_refs, M_VNODE);
-			vfs_op_descs = newop;
-			vfs_op_desc_refs = newref;
-			num_op_descs--;
-		}
-	}
-
-	for (i = 0; i < vnodeopv_num; i++) {
-		if (vnodeopv_descs[i] == opv) {
-			for (j = i; j < (vnodeopv_num - 1); j++)
-				vnodeopv_descs[j] = vnodeopv_descs[j + 1];
-			break;
-		}
-	}
-	if (i == vnodeopv_num)
-		panic("vfs_remove_vnodeops: opv not found");
-	MALLOC(newopv, struct vnodeopv_desc **,
-	       (vnodeopv_num - 1) * sizeof(*newopv), M_VNODE, M_WAITOK);
-	if (newopv == NULL)
-		panic("vfs_remove_vnodeops: no memory");
-	bcopy(vnodeopv_descs, newopv, (vnodeopv_num - 1) * sizeof(*newopv));
-	FREE(vnodeopv_descs, M_VNODE);
-	vnodeopv_descs = newopv;
-	vnodeopv_num--;
+	int i;
 
-	vfs_opv_recalc();
+	DODEBUG(printf("Vnode_interface_init.\n"));
+	DODEBUG(printf ("vfs_opv_numops=%d\n", vfs_opv_numops));
+#ifdef unused
+	/*
+	 * Set all vnode vectors to a well known value.
+	 */
+	for (i = 0; vfs_opv_descs[i]; i++)
+		*(vfs_opv_descs[i]->opv_desc_vector_p) = NULL;
+#endif
+	/*
+	 * assign each op to its offset
+	 *
+	 * XXX This should not be needed, but is because the per
+	 * XXX FS ops tables are not sorted according to the
+	 * XXX vnodeop_desc's offset in vfs_op_descs.  This
+	 * XXX is the same reason we have to take the hit for
+	 * XXX the static inline function calls instead of using
+	 * XXX simple macro references.
+	 */
+	for (i = 0; i < vfs_opv_numops; i++)
+		vfs_op_descs[i]->vdesc_offset = i;
+#ifdef unused
+	/* Finish the job */
+	for (i = 0; vfs_opv_descs[i]; i++)
+		vfs_opv_init(vfs_opv_descs[i]);
+#endif
 }
 
 /*
  * Routines having to do with the management of the vnode table.
  */
+extern struct vnodeops dead_vnodeops;
+extern struct vnodeops spec_vnodeops;
 struct vattr va_null;
 
 /*
@@ -305,8 +240,11 @@ struct vattr va_null;
  */
 /* ARGSUSED*/
 static void
-vfsinit(void *dummy)
+vfsinit(dummy)
+	void *dummy;
 {
+	struct vfsconf **vfc, *vfsp;
+	int maxtypenum;
 
 	namei_zone = zinit("NAMEI", MAXPATHLEN, 0, 0, 2);
 
@@ -319,23 +257,28 @@ vfsinit(void *dummy)
 	 */
 	nchinit();
 	/*
+	 * Build vnode operation vectors.
+	 */
+	vfs_op_init();
+	/*
 	 * Initialize each file system type.
 	 * Vfs type numbers must be distinct from VFS_GENERIC (and VFS_VFSCONF).
 	 */
 	vattr_null(&va_null);
 	maxvfsconf = VFS_GENERIC + 1;
 }
-SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vfsinit, NULL)
 
 int
-vfs_register(struct vfsconf *vfc)
+vfs_register(vfc)
+	struct vfsconf *vfc;
 {
 	struct linker_set *l;
 	struct sysctl_oid **oidpp;
 	struct vfsconf *vfsp;
-	int i, exists;
+	int error, i, maxtypenum, exists;
 
 	vfsp = NULL;
+	exists = 0;
 	l = &sysctl__vfs;
 	if (vfsconf)
 		for (vfsp = vfsconf; vfsp->vfc_next; vfsp = vfsp->vfc_next)
@@ -344,33 +287,23 @@ vfs_register(struct vfsconf *vfc)
 
 	vfc->vfc_typenum = maxvfsconf++;
 	if (vfc->vfc_vfsops->vfs_oid != NULL) {
-		/*
-		 * Attach the oid to the "vfs" node of the sysctl tree if
-		 * it isn't already there (it will be there for statically
-		 * configured vfs's).
-		 */
-		exists = 0;
-		for (i = l->ls_length,
-		    oidpp = (struct sysctl_oid **)l->ls_items;
-		    i-- != 0; oidpp++)
-			if (*oidpp == vfc->vfc_vfsops->vfs_oid) {
+		oidpp = (struct sysctl_oid **)l->ls_items;
+		for (i = l->ls_length; i-- && !exists; oidpp++)
+			if (*oidpp == vfc->vfc_vfsops->vfs_oid)
 				exists = 1;
+	}
+	if (exists == 0 && vfc->vfc_vfsops->vfs_oid != NULL) {
+		oidpp = (struct sysctl_oid **)l->ls_items;
+		for (i = l->ls_length; i--; oidpp++) {
+			if (*oidpp == NULL ||
+			    *oidpp == &sysctl___vfs_mod0 ||
+			    *oidpp == &sysctl___vfs_mod1) {
+				*oidpp = vfc->vfc_vfsops->vfs_oid;
+				(*oidpp)->oid_number = vfc->vfc_typenum;
+				sysctl_order_all();
 				break;
 			}
-		if (exists == 0)
-			for (i = l->ls_length,
-			    oidpp = (struct sysctl_oid **)l->ls_items;
-			    i-- != 0; oidpp++) {
-				if (*oidpp == NULL ||
-				    *oidpp == &sysctl___vfs_mod0 ||
-				    *oidpp == &sysctl___vfs_mod1) {
-					*oidpp = vfc->vfc_vfsops->vfs_oid;
-					break;
-				}
-			}
-
-		vfc->vfc_vfsops->vfs_oid->oid_number = vfc->vfc_typenum;
-		sysctl_order_all();
+		}
 	}
 	if (vfsp)
 		vfsp->vfc_next = vfc;
@@ -387,8 +320,24 @@ vfs_register(struct vfsconf *vfc)
 }
 
 
+/*
+ * To be called at SI_SUB_VFS, SECOND, for each VFS before any are registered.
+ */
+void
+vfs_mod_opv_init(handle)
+	void *handle;
+{
+	int i;
+	struct vnodeopv_desc *opv;
+
+	opv = (struct vnodeopv_desc *)handle;
+	*(opv->opv_desc_vector_p) = NULL;
+	vfs_opv_init(opv);
+}
+
 int
-vfs_unregister(struct vfsconf *vfc)
+vfs_unregister(vfc)
+	struct vfsconf *vfc;
 {
 	struct linker_set *l;
 	struct sysctl_oid **oidpp;
@@ -435,27 +384,3 @@ vfs_unregister(struct vfsconf *vfc)
 	maxvfsconf = maxtypenum + 1;
 	return 0;
 }
-
-int
-vfs_modevent(module_t mod, int type, void *data)
-{
-	struct vfsconf *vfc;
-	int error = 0;
-
-	vfc = (struct vfsconf *)data;
-
-	switch (type) {
-	case MOD_LOAD:
-		if (vfc)
-			error = vfs_register(vfc);
-		break;
-
-	case MOD_UNLOAD:
-		if (vfc)
-			error = vfs_unregister(vfc);
-		break;
-	default:	/* including MOD_SHUTDOWN */
-		break;
-	}
-	return (error);
-}