/*
   * Inode operations for Coda filesystem
   * Original version: (C) 1996 P. Braam and M. Callahan
   * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
   * 
   * Carnegie Mellon encourages users to contribute improvements to
   * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
   */
  
  #include <linux/types.h>
  #include <linux/kernel.h>
  #include <linux/time.h>
  #include <linux/fs.h>
  #include <linux/stat.h>
  #include <linux/errno.h>
  #include <asm/uaccess.h>
  #include <linux/string.h>
  
  #include <linux/coda.h>
  #include <linux/coda_psdev.h>
  #include "coda_linux.h"
  
  /* initialize the debugging variables */
  int coda_fake_statfs;
  
  /* print a fid */
  char * coda_f2s(struct CodaFid *f)
  {
  	static char s[60];
  
   	sprintf(s, "(%08x.%08x.%08x.%08x)", f->opaque[0], f->opaque[1], f->opaque[2], f->opaque[3]);
  
  	return s;
  }
  
  /* recognize special .CONTROL name */
  int coda_iscontrol(const char *name, size_t length)
  {
  	return ((CODA_CONTROLLEN == length) && 
                  (strncmp(name, CODA_CONTROL, CODA_CONTROLLEN) == 0));
  }
  
  /* recognize /coda inode */
  int coda_isroot(struct inode *i)
  {
      return ( i->i_sb->s_root->d_inode == i );
  }
  
  unsigned short coda_flags_to_cflags(unsigned short flags)
  {
  	unsigned short coda_flags = 0;
  	
  	if ((flags & O_ACCMODE) == O_RDONLY)
  		coda_flags |= C_O_READ;
  
  	if ((flags & O_ACCMODE) == O_RDWR)
  		coda_flags |= C_O_READ | C_O_WRITE;
  
  	if ((flags & O_ACCMODE) == O_WRONLY)
  		coda_flags |= C_O_WRITE;
  
  	if (flags & O_TRUNC)
  		coda_flags |= C_O_TRUNC;
  
  	if (flags & O_CREAT)
  		coda_flags |= C_O_CREAT;
  
  	if (flags & O_EXCL)
  		coda_flags |= C_O_EXCL;
  
  	return coda_flags;
  }
  
  
  /* utility functions below */
  void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
  {
          int inode_type;
          /* inode's i_flags, i_ino are set by iget 
             XXX: is this all we need ??
             */
          switch (attr->va_type) {
          case C_VNON:
                  inode_type  = 0;
                  break;
          case C_VREG:
                  inode_type = S_IFREG;
                  break;
          case C_VDIR:
                  inode_type = S_IFDIR;
                  break;
          case C_VLNK:
                  inode_type = S_IFLNK;
                  break;
          default:
                  inode_type = 0;
          }
  	inode->i_mode |= inode_type;
  
  	if (attr->va_mode != (u_short) -1)
  	        inode->i_mode = attr->va_mode | inode_type;
          if (attr->va_uid != -1) 
  	        inode->i_uid = make_kuid(&init_user_ns, (uid_t) attr->va_uid);
          if (attr->va_gid != -1)
  	        inode->i_gid = make_kgid(&init_user_ns, (gid_t) attr->va_gid);
  	if (attr->va_nlink != -1)
  		set_nlink(inode, attr->va_nlink);
  	if (attr->va_size != -1)
  	        inode->i_size = attr->va_size;
  	if (attr->va_size != -1)
  		inode->i_blocks = (attr->va_size + 511) >> 9;
  	if (attr->va_atime.tv_sec != -1) 
  	        inode->i_atime = attr->va_atime;
  	if (attr->va_mtime.tv_sec != -1)
  	        inode->i_mtime = attr->va_mtime;
          if (attr->va_ctime.tv_sec != -1)
  	        inode->i_ctime = attr->va_ctime;
  }
  
  
  /* 
   * BSD sets attributes that need not be modified to -1. 
   * Linux uses the valid field to indicate what should be
   * looked at.  The BSD type field needs to be deduced from linux 
   * mode.
   * So we have to do some translations here.
   */
  
  void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
  {
          unsigned int valid;
  
          /* clean out */        
  	vattr->va_mode = -1;
          vattr->va_uid = (vuid_t) -1; 
          vattr->va_gid = (vgid_t) -1;
          vattr->va_size = (off_t) -1;
  	vattr->va_atime.tv_sec = (time_t) -1;
  	vattr->va_atime.tv_nsec =  (time_t) -1;
          vattr->va_mtime.tv_sec = (time_t) -1;
          vattr->va_mtime.tv_nsec = (time_t) -1;
  	vattr->va_ctime.tv_sec = (time_t) -1;
  	vattr->va_ctime.tv_nsec = (time_t) -1;
          vattr->va_type = C_VNON;
  	vattr->va_fileid = -1;
  	vattr->va_gen = -1;
  	vattr->va_bytes = -1;
  	vattr->va_nlink = -1;
  	vattr->va_blocksize = -1;
  	vattr->va_rdev = -1;
          vattr->va_flags = 0;
  
          /* determine the type */
  #if 0
          mode = iattr->ia_mode;
                  if ( S_ISDIR(mode) ) {
                  vattr->va_type = C_VDIR; 
          } else if ( S_ISREG(mode) ) {
                  vattr->va_type = C_VREG;
          } else if ( S_ISLNK(mode) ) {
                  vattr->va_type = C_VLNK;
          } else {
                  /* don't do others */
                  vattr->va_type = C_VNON;
          }
  #endif 
  
          /* set those vattrs that need change */
          valid = iattr->ia_valid;
          if ( valid & ATTR_MODE ) {
                  vattr->va_mode = iattr->ia_mode;
  	}
          if ( valid & ATTR_UID ) {
                  vattr->va_uid = (vuid_t) from_kuid(&init_user_ns, iattr->ia_uid);
  	}
          if ( valid & ATTR_GID ) {
                  vattr->va_gid = (vgid_t) from_kgid(&init_user_ns, iattr->ia_gid);
  	}
          if ( valid & ATTR_SIZE ) {
                  vattr->va_size = iattr->ia_size;
  	}
          if ( valid & ATTR_ATIME ) {
                  vattr->va_atime = iattr->ia_atime;
  	}
          if ( valid & ATTR_MTIME ) {
                  vattr->va_mtime = iattr->ia_mtime;
  	}
          if ( valid & ATTR_CTIME ) {
                  vattr->va_ctime = iattr->ia_ctime;
  	}
  }