linux/fs/coda/coda_linux.c
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   1/*
   2 * Inode operations for Coda filesystem
   3 * Original version: (C) 1996 P. Braam and M. Callahan
   4 * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
   5 * 
   6 * Carnegie Mellon encourages users to contribute improvements to
   7 * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
   8 */
   9
  10#include <linux/types.h>
  11#include <linux/kernel.h>
  12#include <linux/time.h>
  13#include <linux/fs.h>
  14#include <linux/stat.h>
  15#include <linux/errno.h>
  16#include <asm/uaccess.h>
  17#include <linux/string.h>
  18
  19#include <linux/coda.h>
  20#include <linux/coda_psdev.h>
  21#include "coda_linux.h"
  22
  23/* initialize the debugging variables */
  24int coda_fake_statfs;
  25
  26/* print a fid */
  27char * coda_f2s(struct CodaFid *f)
  28{
  29        static char s[60];
  30
  31        sprintf(s, "(%08x.%08x.%08x.%08x)", f->opaque[0], f->opaque[1], f->opaque[2], f->opaque[3]);
  32
  33        return s;
  34}
  35
  36/* recognize special .CONTROL name */
  37int coda_iscontrol(const char *name, size_t length)
  38{
  39        return ((CODA_CONTROLLEN == length) && 
  40                (strncmp(name, CODA_CONTROL, CODA_CONTROLLEN) == 0));
  41}
  42
  43/* recognize /coda inode */
  44int coda_isroot(struct inode *i)
  45{
  46    return ( i->i_sb->s_root->d_inode == i );
  47}
  48
  49unsigned short coda_flags_to_cflags(unsigned short flags)
  50{
  51        unsigned short coda_flags = 0;
  52        
  53        if ((flags & O_ACCMODE) == O_RDONLY)
  54                coda_flags |= C_O_READ;
  55
  56        if ((flags & O_ACCMODE) == O_RDWR)
  57                coda_flags |= C_O_READ | C_O_WRITE;
  58
  59        if ((flags & O_ACCMODE) == O_WRONLY)
  60                coda_flags |= C_O_WRITE;
  61
  62        if (flags & O_TRUNC)
  63                coda_flags |= C_O_TRUNC;
  64
  65        if (flags & O_CREAT)
  66                coda_flags |= C_O_CREAT;
  67
  68        if (flags & O_EXCL)
  69                coda_flags |= C_O_EXCL;
  70
  71        return coda_flags;
  72}
  73
  74
  75/* utility functions below */
  76void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
  77{
  78        int inode_type;
  79        /* inode's i_flags, i_ino are set by iget 
  80           XXX: is this all we need ??
  81           */
  82        switch (attr->va_type) {
  83        case C_VNON:
  84                inode_type  = 0;
  85                break;
  86        case C_VREG:
  87                inode_type = S_IFREG;
  88                break;
  89        case C_VDIR:
  90                inode_type = S_IFDIR;
  91                break;
  92        case C_VLNK:
  93                inode_type = S_IFLNK;
  94                break;
  95        default:
  96                inode_type = 0;
  97        }
  98        inode->i_mode |= inode_type;
  99
 100        if (attr->va_mode != (u_short) -1)
 101                inode->i_mode = attr->va_mode | inode_type;
 102        if (attr->va_uid != -1) 
 103                inode->i_uid = (uid_t) attr->va_uid;
 104        if (attr->va_gid != -1)
 105                inode->i_gid = (gid_t) attr->va_gid;
 106        if (attr->va_nlink != -1)
 107                set_nlink(inode, attr->va_nlink);
 108        if (attr->va_size != -1)
 109                inode->i_size = attr->va_size;
 110        if (attr->va_size != -1)
 111                inode->i_blocks = (attr->va_size + 511) >> 9;
 112        if (attr->va_atime.tv_sec != -1) 
 113                inode->i_atime = attr->va_atime;
 114        if (attr->va_mtime.tv_sec != -1)
 115                inode->i_mtime = attr->va_mtime;
 116        if (attr->va_ctime.tv_sec != -1)
 117                inode->i_ctime = attr->va_ctime;
 118}
 119
 120
 121/* 
 122 * BSD sets attributes that need not be modified to -1. 
 123 * Linux uses the valid field to indicate what should be
 124 * looked at.  The BSD type field needs to be deduced from linux 
 125 * mode.
 126 * So we have to do some translations here.
 127 */
 128
 129void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
 130{
 131        unsigned int valid;
 132
 133        /* clean out */        
 134        vattr->va_mode = -1;
 135        vattr->va_uid = (vuid_t) -1; 
 136        vattr->va_gid = (vgid_t) -1;
 137        vattr->va_size = (off_t) -1;
 138        vattr->va_atime.tv_sec = (time_t) -1;
 139        vattr->va_atime.tv_nsec =  (time_t) -1;
 140        vattr->va_mtime.tv_sec = (time_t) -1;
 141        vattr->va_mtime.tv_nsec = (time_t) -1;
 142        vattr->va_ctime.tv_sec = (time_t) -1;
 143        vattr->va_ctime.tv_nsec = (time_t) -1;
 144        vattr->va_type = C_VNON;
 145        vattr->va_fileid = -1;
 146        vattr->va_gen = -1;
 147        vattr->va_bytes = -1;
 148        vattr->va_nlink = -1;
 149        vattr->va_blocksize = -1;
 150        vattr->va_rdev = -1;
 151        vattr->va_flags = 0;
 152
 153        /* determine the type */
 154#if 0
 155        mode = iattr->ia_mode;
 156                if ( S_ISDIR(mode) ) {
 157                vattr->va_type = C_VDIR; 
 158        } else if ( S_ISREG(mode) ) {
 159                vattr->va_type = C_VREG;
 160        } else if ( S_ISLNK(mode) ) {
 161                vattr->va_type = C_VLNK;
 162        } else {
 163                /* don't do others */
 164                vattr->va_type = C_VNON;
 165        }
 166#endif 
 167
 168        /* set those vattrs that need change */
 169        valid = iattr->ia_valid;
 170        if ( valid & ATTR_MODE ) {
 171                vattr->va_mode = iattr->ia_mode;
 172        }
 173        if ( valid & ATTR_UID ) {
 174                vattr->va_uid = (vuid_t) iattr->ia_uid;
 175        }
 176        if ( valid & ATTR_GID ) {
 177                vattr->va_gid = (vgid_t) iattr->ia_gid;
 178        }
 179        if ( valid & ATTR_SIZE ) {
 180                vattr->va_size = iattr->ia_size;
 181        }
 182        if ( valid & ATTR_ATIME ) {
 183                vattr->va_atime = iattr->ia_atime;
 184        }
 185        if ( valid & ATTR_MTIME ) {
 186                vattr->va_mtime = iattr->ia_mtime;
 187        }
 188        if ( valid & ATTR_CTIME ) {
 189                vattr->va_ctime = iattr->ia_ctime;
 190        }
 191}
 192
 193
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