/*
 * Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the Kungliga Tekniska
 *      Högskolan and its contributors.
 * 
 * 4. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <xfs_common.h>
#include <xfs_fs.h>
#include <xdeb.h>

#ifdef __GNUC__
__inline
void *
memcpy(void *s1, const void *s2, long unsigned int n)
{
  bcopy(s2, s1, n);
  return s1;
}
#endif

/*
 * Create a new xfs_node and make a VN_HOLD()!
 *
 * Also prevents creation of duplicates. This happens
 * whenever there are more than one name to a file,
 * "." and ".." are common cases.
 */
struct xfs_node *
new_xfs_node(struct xfs *xfsp, struct xfs_msg_node *node)
{
  struct xfs_node *result;

  XFSDEB(XDEBNODE, ("new_xfs_node %d.%d.%d.%d\n",
		   node->handle.a,
		   node->handle.b,
		   node->handle.c,
		   node->handle.d));

  /* Does not allow duplicates */
  result = xfs_node_find(xfsp, &node->handle);
  if (result == 0)
    {
      result = xfs_alloc(sizeof(*result));
      if (result == 0)
	{
	  printf("xfs_alloc(%d) failed\n", (int)sizeof(*result));
	  panic("new_xfs_node: You Loose!");
	}

      /* Init vnode part */
      result->vn.v_vfsmountedhere = 0;
#if 0
      result->vn.v_op = &xfs_vnodeops;
#endif
      result->vn.v_op = NULL;
      result->vn.v_filocks = 0;
      DATA_FROM_XNODE(result) = (struct vnode *) 0;
      xfs_attr2vattr (&node->attr, &result->attr);
      VN_INIT(&result->vn, xfsp->vfsp,
	      result->attr.va_type, result->attr.va_rdev);
      
      result->handle = node->handle;
      result->flags = 0;
      result->tokens = 0;
      
      /* Save reference on list */
      result->next = xfsp->nodes;
      xfsp->nodes = result;
      xfsp->nnodes++;
    }
  else
    {
      /* Node is already cached */
      VN_HOLD(XNODE_TO_VNODE(result));
    }

  /* Init other fields */
  xfs_attr2vattr (&node->attr, &result->attr);
  XFS_TOKEN_SET(result, XFS_ATTR_R, XFS_ATTR_MASK);
  bcopy(node->id, result->id, sizeof(result->id));
  bcopy(node->rights, result->rights, sizeof(result->rights));

  return result;
}

void
free_xfs_node(struct xfs_node *node)
{
  struct xfs *xfsp = XFS_FROM_XNODE(node);
  struct xfs_node *t;

  XFSDEB(XDEBNODE, ("free_xfs_node starting\n"));

  /* First remove from chain. */
  if (node == xfsp->nodes)
    {
      xfsp->nodes = node->next;
    }
  else
    {
      for (t = xfsp->nodes; t->next; t = t->next)
	if (t->next == node)
	  {
	    t->next = t->next->next;
	    goto done;
	  }
      printf("XFS PANIC Error: free_xfs_node(0x%x) failed?\n", (int) node);
      return;
    }

 done:
  /* XXX Really need to put back dirty data first. */
  if (DATA_FROM_XNODE(node))
    {
      VN_RELE(DATA_FROM_XNODE(node));
    }
  xfsp->nnodes--;
  xfs_free(node, sizeof(*node));

  XFSDEB(XDEBNODE, ("free_xfs_node done\n"));
}

void
free_all_xfs_nodes(struct xfs *xfsp)
{
  struct xfs_node *t;

  XFSDEB(XDEBNODE, ("free_all_xfs_nodes starting\n"));

  xfs_dnlc_purge();		/* This is really a bit brutal! */
  XFSDEB(XDEBNODE, ("free_all_xfs_nodes now removing root\n"));
  if (xfsp->root)
    {
      VN_RELE(XNODE_TO_VNODE(xfsp->root));
      xfsp->root = 0;
    }

  /* There might still be a few nodes out there, invalidate them */
  for (t = xfsp->nodes; t; t = t->next)
    {
      t->tokens = 0;
      if (DATA_FROM_XNODE(t))
	{
	  VN_RELE(DATA_FROM_XNODE(t));
	  DATA_FROM_XNODE(t) = (struct vnode *) 0;
	}
    }

  XFSDEB(XDEBNODE, ("free_all_xfs_nodes done\n"));
}

struct xfs_node *
xfs_node_find(struct xfs *xfsp, xfs_handle *handlep)
{
  struct xfs_node *t;

  XFSDEB(XDEBNODE, ("xfs_node_find\n"));

  for (t = xfsp->nodes; t != 0; t = t->next)
    if (xfs_handle_eq(&t->handle, handlep))
      break;
  return t;
}

struct long_entry {
  struct vnode *dvp, *vp;
  char nm[MAXNAMELEN + 1];
  int len;
};

static struct long_entry tbl;

int
xfs_dnlc_enter(struct vnode *dvp, char *nm, struct vnode *vp)
{
  int len;
  
  XFSDEB(XDEBDNLC, ("xfs_dnlc_enter(0x%x, \"%s\", 0x%x)\n",
		    (int) dvp, nm, (int) vp));

  len = strlen(nm);
  if (len <= NC_NAMLEN) {
    dnlc_enter(dvp, nm, vp, NOCRED);
    return 0;
  }

  /* Be careful to HOLD first because dvp and vp
   * might be aliased to tbl.dvp or tbl.vp. */
  VN_HOLD(dvp);
  VN_HOLD(vp);
  if (tbl.dvp != 0)
    {
      VN_RELE(tbl.dvp);
      VN_RELE(tbl.vp);
    }
  bcopy(nm, tbl.nm, len);
  tbl.nm[len] = '\0';
  tbl.len = len;
  tbl.dvp = dvp;
  tbl.vp = vp; 
  return 0;
}

struct vnode *
xfs_dnlc_lookup(struct vnode *dvp, char *nm)
{
  struct vnode *res;

  XFSDEB(XDEBDNLC, ("xfs_dnlc_lookup(0x%x, \"%s\")\n", (int) dvp, nm));

  res = dnlc_lookup(dvp, nm, NOCRED);
  if (res)
    return res;
  else if (   (tbl.dvp == dvp)
	   && (*tbl.nm == *nm)
	   && (strncmp(tbl.nm, nm, tbl.len + 1) == 0))
    return tbl.vp;
  else
    return 0;
}

void
xfs_dnlc_purge(void)
{
  XFSDEB(XDEBDNLC, ("xfs_dnlc_purge()\n"));

  dnlc_purge();

  if (tbl.dvp)
    {
      VN_RELE(tbl.dvp);
      tbl.dvp = 0;
      VN_RELE(tbl.vp);
      tbl.vp = 0;
    }
}

void
vattr2xfs_attr(const struct vattr *va, struct xfs_attr *xa)
{
    bzero (xa, sizeof(*xa));
    if (va->va_mask & AT_MODE)
	XA_SET_MODE(xa, va->va_mode);
    if (va->va_mask & AT_NLINK)
	XA_SET_NLINK(xa, va->va_nlink);
    if (va->va_mask & AT_SIZE)
	XA_SET_SIZE(xa, va->va_size);
    if (va->va_mask & AT_UID)
	XA_SET_UID(xa, va->va_uid);
    if (va->va_mask & AT_GID)
	XA_SET_GID(xa, va->va_gid);
    if (va->va_mask & AT_ATIME)
	XA_SET_ATIME(xa, va->va_atime.tv_sec);
    if (va->va_mask & AT_MTIME)
	XA_SET_MTIME(xa, va->va_mtime.tv_sec);
    if (va->va_mask & AT_CTIME)
	XA_SET_CTIME(xa, va->va_ctime.tv_sec);
    if (va->va_mask & AT_NODEID)
	XA_SET_FILEID(xa, va->va_nodeid);
    switch(va->va_type) {
    case VNON :
	xa->xa_type = XFS_FILE_NON;
	break;
    case VREG :
	xa->xa_type = XFS_FILE_REG;
	break;
    case VDIR :
	xa->xa_type = XFS_FILE_DIR;
	break;
    case VBLK :
	xa->xa_type = XFS_FILE_BLK;
	break;
    case VCHR :
	xa->xa_type = XFS_FILE_CHR;
	break;
    case VLNK :
	xa->xa_type = XFS_FILE_LNK;
	break;
    case VFIFO :
	xa->xa_type = XFS_FILE_FIFO;
	break;
    case VBAD :
	xa->xa_type = XFS_FILE_BAD;
	break;
    default :
	panic("xfs_attr2attr: bad value");
    }
}

void
xfs_attr2vattr(const struct xfs_attr *xa, struct vattr *va)
{
    bzero(va, sizeof(*va));
    if (XA_VALID_MODE(xa)) {
	va->va_mode  = xa->xa_mode;
	va->va_mask |= AT_MODE;
    }
    if (XA_VALID_NLINK(xa)) {
	va->va_nlink = xa->xa_nlink;
	va->va_mask |= AT_NLINK;
    }
    if (XA_VALID_SIZE(xa)) {
	va->va_size  = xa->xa_size;
	va->va_mask |= AT_SIZE;
    }
    if (XA_VALID_UID(xa)) {
	va->va_uid   = xa->xa_uid;
	va->va_mask |= AT_UID;
    }
    if (XA_VALID_GID(xa)) {
	va->va_gid   = xa->xa_gid;
	va->va_mask |= AT_GID;
    }
    if (XA_VALID_ATIME(xa)) {
	va->va_atime.tv_sec  = xa->xa_atime;
	va->va_atime.tv_nsec = 0;
	va->va_mask |= AT_ATIME;
    }
    if (XA_VALID_MTIME(xa)) {
	va->va_mtime.tv_sec  = xa->xa_mtime;
	va->va_mtime.tv_nsec = 0;
	va->va_mask |= AT_MTIME;
    }
    if (XA_VALID_CTIME(xa)) {
	va->va_ctime.tv_sec  = xa->xa_ctime;
	va->va_ctime.tv_nsec = 0;
	va->va_mask |= AT_CTIME;
    }
    if (XA_VALID_FILEID(xa)) {
	va->va_nodeid = xa->xa_fileid;
	va->va_mask |= AT_NODEID;
    }
    if (XA_VALID_TYPE(xa)) {
	va->va_mask |= AT_MODE;
	switch(xa->xa_type) {
	case XFS_FILE_NON :
	    va->va_type = VNON;
	    break;
	case XFS_FILE_REG :
	    va->va_type = VREG;
	    break;
	case XFS_FILE_DIR :
	    va->va_type = VDIR;
	    break;
	case XFS_FILE_BLK :
	    va->va_type = VBLK;
	    break;
	case XFS_FILE_CHR :
	    va->va_type = VCHR;
	    break;
	case XFS_FILE_LNK :
	    va->va_type = VLNK;
	    break;
	case XFS_FILE_FIFO :
	    va->va_type = VFIFO;
	    break;
	case XFS_FILE_BAD :
	    va->va_type = VBAD;
	    break;
	default :
	    panic("xfs_attr2attr: bad value");
	}
    }
}