vnode.c

Solaris操作系统下的过滤驱动程序, C源码程序.

}

/****************************************************************************/
/*
 * get page routine
 * This is called only if the pages are NOT in the cache!
 * XXX: ap->a_offset is always ignored
 */
static int
wrapfs_getpages(ap)
     struct vop_getpages_args /* {
				 struct vnode *a_vp;
				 vm_page_t *a_m;
				 int a_count;
				 int a_reqpage;
				 vm_ooffset_t a_offset;
			      } */ *ap;
{
  int error = VM_PAGER_ERROR;
  struct vnode *vp = ap->a_vp;
  struct vnode *lowervp = WRAPFS_VP_TO_LOWERVP(vp);
  int reqpage = ap->a_reqpage;
  int bytecount = ap->a_count;
  vm_page_t thispp;
  int i, resid;
  int pagecount = round_page(bytecount) / PAGE_SIZE;
  vm_offset_t thiskva;
  caddr_t thisca;
  uio_t temp_uio;
  iovec_t *free_iovecp, *free_iovarr;
  cred_t *cr = curproc->p_ucred;

  fist_dprint(2, "WRAPFS_GETPAGES: vp=0x%x, lowervp=0x%x, m=0x%x, pages=%d, bytes=%d, reqpage=%d, offset=%d\n", /* XXX: change level to 4 */
	      (int) vp,
	      (int) lowervp,
	      (int) ap->a_m,
	      pagecount,
	      bytecount,
	      reqpage,
	      (int) ap->a_offset
	      );
  wrapfs_verify_lower_object(vp, __FUNCTION__);

  /* prepare for a VOP_READ on the lowervp data straight into this vp's pages */
  temp_uio.uio_resid = bytecount;
  temp_uio.uio_offset = IDX_TO_OFF(ap->a_m[0]->pindex);
  temp_uio.uio_segflg = UIO_SYSSPACE;
  temp_uio.uio_rw = UIO_READ;
  temp_uio.uio_procp = curproc;
  temp_uio.uio_iovcnt = pagecount;
  temp_uio.uio_iov = free_iovarr = (iovec_t *) kmem_zalloc(pagecount * sizeof(iovec_t));
  free_iovecp = (iovec_t *) kmem_zalloc(pagecount * sizeof(iovec_t));
  if (!temp_uio.uio_iov || !free_iovecp) {
    error = VM_PAGER_AGAIN;
    printf("GetPages: nore more memory for temp uio\n");
    goto out;
  }

  /* setup pointers to each page to read */
  for (i = 0; i < pagecount; i++) {
    temp_uio.uio_iov[i].iov_base = free_iovecp[i].iov_base = kmem_zalloc(PAGE_SIZE);
    if (!free_iovecp[i].iov_base) {
      error = VM_PAGER_AGAIN;
      printf("GetPages: nore more memory for temp iovecs\n");
      goto out;
    }
    temp_uio.uio_iov[i].iov_len = free_iovecp[i].iov_len = PAGE_SIZE;
  }

  /* do the actual VOP_READ */
  error = VOP_READ(lowervp, &temp_uio, (IO_VMIO | IO_SYNC), curproc->p_ucred);
  if (error) {
    printf("GETPAGES: read on behalf of vmio failed with error %d\n", error);
    error = VM_PAGER_ERROR;
    goto out;
  }

  /* if residual is non-zero, do nothing since rest of pages were zalloc'ed */
  resid = temp_uio.uio_resid;
  if (resid > PAGE_SIZE)
    panic("GETPAGES: temp_iovec.uio_resid is %d > PAGE_SIZE\n", resid);

  /* copy and decode all the bytes */
  for (i = 0; i < pagecount; i++) {
    thispp = ap->a_m[i];
    thiskva = vm_pager_map_page(thispp);
    thisca = (caddr_t) thiskva;
    bcopy(free_iovecp[i].iov_base, thisca, PAGE_SIZE);
    wrapfs_decode_block(thisca, thisca, PAGE_SIZE, vp, vp->v_mount);
    vm_pager_unmap_page(thiskva);
  }

  /* set status of pages to valid and non-busy as needed */
  for (i = 0; i < pagecount; i++) {
    thispp = ap->a_m[i];
    thispp->valid = VM_PAGE_BITS_ALL;
    if (i == reqpage)
      thispp->flags |= PG_BUSY;	/* requested page must be busy */
    else
      thispp->flags &= ~PG_BUSY; /* XXX: others need not? */
    fist_print_page("getpages: thispp0", thispp);
  }

  error = VM_PAGER_OK;
out:
  if (free_iovecp) {
    for (i = 0; i < pagecount; i++)
      if (free_iovecp[i].iov_base)
	kmem_free(free_iovecp[i].iov_base);
    kmem_free(free_iovecp);
  }
  if (free_iovarr)
    kmem_free(free_iovarr);
  print_location();
  return (error);
}

/*
 * put page routine
 * XXX: ap->a_offset is always ignored
 */
static int
wrapfs_putpages(ap)
     struct vop_putpages_args /* {
				 struct vnode *a_vp;
				 vm_page_t *a_m;
				 int a_count;
				 int a_sync;
				 int *a_rtvals;
				 vm_ooffset_t a_offset;
				 } */ *ap;
{
  int error;
  struct vnode *vp = ap->a_vp;
  struct vnode *lowervp = WRAPFS_VP_TO_LOWERVP(vp);
  int bytecount = ap->a_count;
  int pagecount = round_page(bytecount) / PAGE_SIZE;
  vm_page_t thispp;
  int i, resid;
  vm_offset_t thiskva;
  caddr_t thisca;
  uio_t temp_uio;
  iovec_t *free_iovecp, *free_iovarr;
  cred_t *cr = curproc->p_ucred;

  fist_dprint(2, "WRAPFS_PUTPAGES: vp=0x%x, lowervp=0x%x, sync=0x%x\n",
	      (int) vp, (int) lowervp, ap->a_sync);

  /* prepare for a VOP_WRITE on the lowervp data straight into this vp's pages */
  temp_uio.uio_resid = bytecount;
  temp_uio.uio_offset = IDX_TO_OFF(ap->a_m[0]->pindex);
  temp_uio.uio_segflg = UIO_SYSSPACE;
  temp_uio.uio_rw = UIO_WRITE;
  temp_uio.uio_procp = curproc;
  temp_uio.uio_iovcnt = pagecount;
  temp_uio.uio_iov = free_iovarr = (iovec_t *) kmem_zalloc(pagecount * sizeof(iovec_t));
  free_iovecp = (iovec_t *) kmem_zalloc(pagecount * sizeof(iovec_t));
  if (!temp_uio.uio_iov || !free_iovecp) {
    error = VM_PAGER_AGAIN;
    printf("PutPages: nore more memory for temp uio\n");
    goto out;
  }

  /* setup pointers to each page to write */
  for (i = 0; i < pagecount; i++) {
    temp_uio.uio_iov[i].iov_base = free_iovecp[i].iov_base = kmem_zalloc(PAGE_SIZE);
    if (!free_iovecp[i].iov_base) {
      error = VM_PAGER_AGAIN;
      printf("PutPages: nore more memory for temp iovecs\n");
      goto out;
    }
    temp_uio.uio_iov[i].iov_len = free_iovecp[i].iov_len = PAGE_SIZE;
  }

  /* copy and decode all the bytes */
  for (i = 0; i < pagecount; i++) {
    thispp = ap->a_m[i];
    thiskva = vm_pager_map_page(thispp);
    thisca = (caddr_t) thiskva;
    bcopy(thisca, free_iovecp[i].iov_base, PAGE_SIZE);
    wrapfs_encode_block(free_iovecp[i].iov_base, free_iovecp[i].iov_base, PAGE_SIZE, vp, vp->v_mount);
    vm_pager_unmap_page(thiskva);
  }

  /* do the actual VOP_WRITE */
  error = VOP_WRITE(lowervp, &temp_uio, (IO_VMIO | IO_SYNC), curproc->p_ucred);
  if (error) {
    printf("PUTPAGES: write on behalf of vmio failed with error %d\n", error);
    error = VM_PAGER_ERROR;
    goto out;
  }

  /* if residual is non-zero, do nothing since rest of pages were zalloc'ed */
  resid = temp_uio.uio_resid;
  if (resid > PAGE_SIZE)
    panic("PUTPAGES: temp_iovec.uio_resid is %d > PAGE_SIZE\n", resid);

  /* set status of pages to valid and non-busy as needed */
  for (i = 0; i < pagecount; i++) {
    thispp = ap->a_m[i];
    thispp->valid = VM_PAGE_BITS_ALL;
    thispp->flags &= ~PG_BUSY;
    fist_print_page("putpages: thispp0", thispp);
  }

  error = VM_PAGER_OK;
out:
  if (free_iovecp) {
    for (i = 0; i < pagecount; i++)
      if (free_iovecp[i].iov_base)
	kmem_free(free_iovecp[i].iov_base);
    kmem_free(free_iovecp);
  }
  if (free_iovarr)
    kmem_free(free_iovarr);
  print_location();
  return (error);
}

#ifdef HAVE_BMAP
static int
wrapfs_bmap(ap)
     struct vop_bmap_args /* {
			     struct vnode *a_vp;
			     daddr_t a_bn;
			     struct vnode **a_vpp;
			     daddr_t *a_bnp;
			     int *a_runp;
			     int *a_runb;
			     } */ *ap;
{
  int error = 0;
  struct vnode *vp = ap->a_vp;
  struct vnode *lowervp = WRAPFS_VP_TO_LOWERVP(vp);

  fist_dprint(4, "WRAPFS_BMAP:0x%x:0x%x\n", (int) ap->a_vpp, (int) lowervp);
  printf("WRAPFS_BMAP:0x%x:0x%x\n", (int) ap->a_vpp, (int) lowervp);

  wrapfs_verify_lower_object(vp, __FUNCTION__);

#if 0
  ap->a_vp = lowervp;
  error = VCALL(lowervp, VOFFSET(vop_bmap), ap);
  return (error);
#endif

#if 1
  error = wrapfs_bypass((struct vop_generic_args *) ap);
  return (error);
#endif

#if 0
  /* this code also doesn't panic */
  if (ap->a_vpp != NULL)
    *ap->a_vpp = ap->a_vp;
  if (ap->a_bnp != NULL)
    *ap->a_bnp = ap->a_bn;
  if (ap->a_runp != NULL)
    *ap->a_runp = 0;
  if (ap->a_runb != NULL)
    *ap->a_runb = 0;
  return (error);
#endif

#if 0
  error = EINVAL;
  return (error);
#endif
}
#endif /* HAVE_BMAP */

static int
wrapfs_mmap(ap)
     struct vop_mmap_args /* {
			     struct vnode *a_vp;
			     int  a_fflags;
			     struct ucred *a_cred;
			     struct proc *a_p;
			     } */ *ap;
{
  int error;
  struct vnode *vp = ap->a_vp;
  struct vnode *lowervp = WRAPFS_VP_TO_LOWERVP(vp);

  fist_dprint(4, "WRAPFS_MMAP: vp=0x%x\n", (int) vp);
  printf("WRAPFS_MMAP: vp=0x%x\n", (int) vp);

  wrapfs_verify_lower_object(vp, __FUNCTION__);
  error = VOP_MMAP(lowervp, ap->a_fflags, ap->a_cred, ap->a_p);

  return (error);
}


#ifdef FIST_FILTER_NAME

static int
wrapfs_mkdir(ap)
     struct vop_mkdir_args /* {
			      struct vnode *a_dvp;
			      struct vnode **a_vpp;
			      struct componentname *a_cnp;
			      struct vattr *a_vap;
			      } */ *ap;
{
  int error;
  vnode_t *thisdvp = ap->a_dvp;
  vnode_t *lowerdvp = WRAPFS_VP_TO_LOWERVP(thisdvp);
  CNP_VARS;

  fist_dprint(2, "WRAPFS_MKDIR: lowerdvp=0x%x\n", (int) lowerdvp);

  CNP_BEFORE(thisdvp);
  error = wrapfs_bypass((struct vop_generic_args *) ap);
  CNP_AFTER(thisdvp);

  print_location();
  return (error);
}

static int
wrapfs_rmdir(ap)
     struct vop_rmdir_args /* {
			      struct vnode *a_dvp;
			      struct vnode *a_vp;
			      struct componentname *a_cnp;
			      } */ *ap;
{
  int error;
  vnode_t *thisdvp = ap->a_dvp;
  vnode_t *thisvp = ap->a_vp;
  vnode_t *lowerdvp = WRAPFS_VP_TO_LOWERVP(thisdvp);
  vnode_t *lowervp = WRAPFS_VP_TO_LOWERVP(thisvp);
  CNP_VARS;

  fist_dprint(2, "WRAPFS_RMDIR: lowerdvp=0x%x lowervp=0x%x\n",
	      (int) lowerdvp, (int) lowervp);

  CNP_BEFORE(thisvp);
  error = wrapfs_bypass((struct vop_generic_args *) ap);
  CNP_AFTER(thisvp);

  print_location();
  return (error);
}

static int
wrapfs_create(ap)
     struct vop_create_args /* {
			       struct vnode *a_dvp;
			       struct vnode **a_vpp;
			       struct componentname *a_cnp;
			       struct vattr *a_vap;
			       } */ *ap;
{
  int error;
  vnode_t *thisdvp = ap->a_dvp;
  vnode_t *lowerdvp = WRAPFS_VP_TO_LOWERVP(thisdvp);
  CNP_VARS;

  fist_dprint(2, "WRAPFS_CREATE: lowerdvp=0x%x\n", (int) lowerdvp);

  CNP_BEFORE(thisdvp);
  error = wrapfs_bypass((struct vop_generic_args *) ap);
  CNP_AFTER(thisdvp);

  print_location();
  return (error);
}

static int
wrapfs_remove(ap)
     struct vop_remove_args /* {
			       struct vnode *a_dvp;
			       struct vnode *a_vp;
			       struct componentname *a_cnp;
			       } */ *ap;
{
  int error;
  vnode_t *thisdvp = ap->a_dvp;
  vnode_t *lowerdvp = WRAPFS_VP_TO_LOWERVP(ap->a_dvp);
  vnode_t *lowervp = WRAPFS_VP_TO_LOWERVP(ap->a_vp);
  CNP_VARS;

  fist_dprint(2, "WRAPFS_REMOVE: lowerdvp=0x%x lowervp=0x%x\n",
	      (int) lowerdvp, (int) lowervp);

  CNP_BEFORE(thisdvp);
  error = wrapfs_bypass((struct vop_generic_args *) ap);
  CNP_AFTER(thisdvp);

  return (error);
}

static int
wrapfs_rename(ap)
     struct vop_rename_args  /* {
				struct vnode *a_fdvp;
				struct vnode *a_fvp;
				struct componentname *a_fcnp;
				struct vnode *a_tdvp;
				struct vnode *a_tvp;
				struct componentname *a_tcnp;
				} */ *ap;
{
  int error;
  vnode_t *thisfdvp = ap->a_fdvp;
  vnode_t *thisfvp = ap->a_fvp;
  vnode_t *thistdvp = ap->a_tdvp;
  vnode_t *thistvp = ap->a_tvp;	/* this one comes in as NULL! */
  vnode_t *lowerfdvp = WRAPFS_VP_TO_LOWERVP(thisfdvp);
  vnode_t *lowerfvp = WRAPFS_VP_TO_LOWERVP(thisfvp);
  vnode_t *lowertdvp = WRAPFS_VP_TO_LOWERVP(thistdvp);
  vnode_t *lowertvp = NULL;