LXR linux/fs/coda/coda

   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 <linux/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
  43unsigned short coda_flags_to_cflags(unsigned short flags)
  44{
  45        unsigned short coda_flags = 0;
  46        
  47        if ((flags & O_ACCMODE) == O_RDONLY)
  48                coda_flags |= C_O_READ;
  49
  50        if ((flags & O_ACCMODE) == O_RDWR)
  51                coda_flags |= C_O_READ | C_O_WRITE;
  52
  53        if ((flags & O_ACCMODE) == O_WRONLY)
  54                coda_flags |= C_O_WRITE;
  55
  56        if (flags & O_TRUNC)
  57                coda_flags |= C_O_TRUNC;
  58
  59        if (flags & O_CREAT)
  60                coda_flags |= C_O_CREAT;
  61
  62        if (flags & O_EXCL)
  63                coda_flags |= C_O_EXCL;
  64
  65        return coda_flags;
  66}
  67
  68
  69/* utility functions below */
  70void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
  71{
  72        int inode_type;
  73        /* inode's i_flags, i_ino are set by iget 
  74           XXX: is this all we need ??
  75           */
  76        switch (attr->va_type) {
  77        case C_VNON:
  78                inode_type  = 0;
  79                break;
  80        case C_VREG:
  81                inode_type = S_IFREG;
  82                break;
  83        case C_VDIR:
  84                inode_type = S_IFDIR;
  85                break;
  86        case C_VLNK:
  87                inode_type = S_IFLNK;
  88                break;
  89        default:
  90                inode_type = 0;
  91        }
  92        inode->i_mode |= inode_type;
  93
  94        if (attr->va_mode != (u_short) -1)
  95                inode->i_mode = attr->va_mode | inode_type;
  96        if (attr->va_uid != -1) 
  97                inode->i_uid = make_kuid(&init_user_ns, (uid_t) attr->va_uid);
  98        if (attr->va_gid != -1)
  99                inode->i_gid = make_kgid(&init_user_ns, (gid_t) attr->va_gid);
 100        if (attr->va_nlink != -1)
 101                set_nlink(inode, attr->va_nlink);
 102        if (attr->va_size != -1)
 103                inode->i_size = attr->va_size;
 104        if (attr->va_size != -1)
 105                inode->i_blocks = (attr->va_size + 511) >> 9;
 106        if (attr->va_atime.tv_sec != -1) 
 107                inode->i_atime = attr->va_atime;
 108        if (attr->va_mtime.tv_sec != -1)
 109                inode->i_mtime = attr->va_mtime;
 110        if (attr->va_ctime.tv_sec != -1)
 111                inode->i_ctime = attr->va_ctime;
 112}
 113
 114
 115/* 
 116 * BSD sets attributes that need not be modified to -1. 
 117 * Linux uses the valid field to indicate what should be
 118 * looked at.  The BSD type field needs to be deduced from linux 
 119 * mode.
 120 * So we have to do some translations here.
 121 */
 122
 123void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
 124{
 125        unsigned int valid;
 126
 127        /* clean out */        
 128        vattr->va_mode = -1;
 129        vattr->va_uid = (vuid_t) -1; 
 130        vattr->va_gid = (vgid_t) -1;
 131        vattr->va_size = (off_t) -1;
 132        vattr->va_atime.tv_sec = (time_t) -1;
 133        vattr->va_atime.tv_nsec =  (time_t) -1;
 134        vattr->va_mtime.tv_sec = (time_t) -1;
 135        vattr->va_mtime.tv_nsec = (time_t) -1;
 136        vattr->va_ctime.tv_sec = (time_t) -1;
 137        vattr->va_ctime.tv_nsec = (time_t) -1;
 138        vattr->va_type = C_VNON;
 139        vattr->va_fileid = -1;
 140        vattr->va_gen = -1;
 141        vattr->va_bytes = -1;
 142        vattr->va_nlink = -1;
 143        vattr->va_blocksize = -1;
 144        vattr->va_rdev = -1;
 145        vattr->va_flags = 0;
 146
 147        /* determine the type */
 148#if 0
 149        mode = iattr->ia_mode;
 150                if ( S_ISDIR(mode) ) {
 151                vattr->va_type = C_VDIR; 
 152        } else if ( S_ISREG(mode) ) {
 153                vattr->va_type = C_VREG;
 154        } else if ( S_ISLNK(mode) ) {
 155                vattr->va_type = C_VLNK;
 156        } else {
 157                /* don't do others */
 158                vattr->va_type = C_VNON;
 159        }
 160#endif 
 161
 162        /* set those vattrs that need change */
 163        valid = iattr->ia_valid;
 164        if ( valid & ATTR_MODE ) {
 165                vattr->va_mode = iattr->ia_mode;
 166        }
 167        if ( valid & ATTR_UID ) {
 168                vattr->va_uid = (vuid_t) from_kuid(&init_user_ns, iattr->ia_uid);
 169        }
 170        if ( valid & ATTR_GID ) {
 171                vattr->va_gid = (vgid_t) from_kgid(&init_user_ns, iattr->ia_gid);
 172        }
 173        if ( valid & ATTR_SIZE ) {
 174                vattr->va_size = iattr->ia_size;
 175        }
 176        if ( valid & ATTR_ATIME ) {
 177                vattr->va_atime = iattr->ia_atime;
 178        }
 179        if ( valid & ATTR_MTIME ) {
 180                vattr->va_mtime = iattr->ia_mtime;
 181        }
 182        if ( valid & ATTR_CTIME ) {
 183                vattr->va_ctime = iattr->ia_ctime;
 184        }
 185}
 186
 187