add kinfo_vnode to copyout vnodes

SCCS-vsn: sys/kern/vfs_subr.c 7.39

diff --git a/usr/src/sys/kern/vfs_subr.c b/usr/src/sys/kern/vfs_subr.c
index 4720466..52d5ee5 100644 (file)
--- a/usr/src/sys/kern/vfs_subr.c
+++ b/usr/src/sys/kern/vfs_subr.c
@@ -14,7 +14,7 @@
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  *
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  *

- *     @(#)vfs_subr.c  7.38 (Berkeley) %G%
+ *     @(#)vfs_subr.c  7.39 (Berkeley) %G%

  */
 
 /*
  */
 
 /*


@@ -814,3 +814,77 @@ vprint(label, vp)
        printf("\n\t");
        VOP_PRINT(vp);
 }
        printf("\n\t");
        VOP_PRINT(vp);
 }

+
+int kinfo_vdebug = 1;
+int kinfo_vgetfailed;
+#define KINFO_VNODESLOP        10
+/*
+ * Dump vnode list (via kinfo).
+ * Copyout address of vnode followed by vnode.
+ */
+kinfo_vnode(op, where, acopysize, arg, aneeded)
+       char *where;
+       int *acopysize, *aneeded;
+{
+       register struct mount *mp = rootfs;
+       register struct vnode *nextvp;
+       struct vnode *vp;
+       register needed = 0;
+       register char *bp = where, *savebp;
+       char *ewhere = where + *acopysize;
+       int error;
+
+#define VPTRSZ sizeof (struct vnode *)
+#define VNODESZ        sizeof (struct vnode)
+       if (where == NULL) {
+               *aneeded = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ);
+               return (0);
+       }
+               
+#define RETRY  bp = savebp ; goto again
+       do {
+               /*
+                * A vget can fail if the vnode is being
+                * recycled.  In this (rare) case, we have to start
+                * over with this filesystem.  Also, have to
+                * check that nextvp is still associated
+                * with this filesystem.  RACE: could have been
+                * recycled onto same filesystem.
+                */
+               savebp = bp;
+again:
+               nextvp = mp->m_mounth;
+               while (vp = nextvp) {
+                       if (vget(vp)) {
+                               if (kinfo_vdebug)
+                                       printf("kinfo: vget failed\n");
+                               kinfo_vgetfailed++;
+                               RETRY;
+                       }
+                       if (vp->v_mount != mp) {
+                               if (kinfo_vdebug)
+                                       printf("kinfo: vp changed\n");
+                               vput(vp);
+                               RETRY;
+                       }
+                       if ((bp + VPTRSZ + VNODESZ <= ewhere) && 
+                           ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) ||
+                            (error = copyout((caddr_t)vp, bp + VPTRSZ, 
+                             VNODESZ)))) {
+                               vput(vp);
+                               return (error);
+                       }
+                       bp += VPTRSZ + VNODESZ;
+                       nextvp = vp->v_mountf;
+                       vput(vp);
+               }
+               mp = mp->m_next;
+       } while (mp != rootfs);
+
+       *aneeded = bp - where;
+       if (bp > ewhere)
+               *acopysize = ewhere - where;
+       else
+               *acopysize = bp - where;
+       return (0);
+}