LXR linux/fs/coda/coda

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Inode operations for Coda filesystem
   4 * Original version: (C) 1996 P. Braam and M. Callahan
   5 * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
   6 * 
   7 * Carnegie Mellon encourages users to contribute improvements to
   8 * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
   9 */
  10
  11#include <linux/types.h>
  12#include <linux/kernel.h>
  13#include <linux/time.h>
  14#include <linux/fs.h>
  15#include <linux/stat.h>
  16#include <linux/errno.h>
  17#include <linux/uaccess.h>
  18#include <linux/string.h>
  19
  20#include <linux/coda.h>
  21#include <linux/coda_psdev.h>
  22#include "coda_linux.h"
  23
  24/* initialize the debugging variables */
  25int coda_fake_statfs;
  26
  27/* print a fid */
  28char * coda_f2s(struct CodaFid *f)
  29{
  30        static char s[60];
  31
  32        sprintf(s, "(%08x.%08x.%08x.%08x)", f->opaque[0], f->opaque[1], f->opaque[2], f->opaque[3]);
  33
  34        return s;
  35}
  36
  37/* recognize special .CONTROL name */
  38int coda_iscontrol(const char *name, size_t length)
  39{
  40        return ((CODA_CONTROLLEN == length) && 
  41                (strncmp(name, CODA_CONTROL, CODA_CONTROLLEN) == 0));
  42}
  43
  44unsigned short coda_flags_to_cflags(unsigned short flags)
  45{
  46        unsigned short coda_flags = 0;
  47        
  48        if ((flags & O_ACCMODE) == O_RDONLY)
  49                coda_flags |= C_O_READ;
  50
  51        if ((flags & O_ACCMODE) == O_RDWR)
  52                coda_flags |= C_O_READ | C_O_WRITE;
  53
  54        if ((flags & O_ACCMODE) == O_WRONLY)
  55                coda_flags |= C_O_WRITE;
  56
  57        if (flags & O_TRUNC)
  58                coda_flags |= C_O_TRUNC;
  59
  60        if (flags & O_CREAT)
  61                coda_flags |= C_O_CREAT;
  62
  63        if (flags & O_EXCL)
  64                coda_flags |= C_O_EXCL;
  65
  66        return coda_flags;
  67}
  68
  69
  70/* utility functions below */
  71void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
  72{
  73        int inode_type;
  74        /* inode's i_flags, i_ino are set by iget 
  75           XXX: is this all we need ??
  76           */
  77        switch (attr->va_type) {
  78        case C_VNON:
  79                inode_type  = 0;
  80                break;
  81        case C_VREG:
  82                inode_type = S_IFREG;
  83                break;
  84        case C_VDIR:
  85                inode_type = S_IFDIR;
  86                break;
  87        case C_VLNK:
  88                inode_type = S_IFLNK;
  89                break;
  90        default:
  91                inode_type = 0;
  92        }
  93        inode->i_mode |= inode_type;
  94
  95        if (attr->va_mode != (u_short) -1)
  96                inode->i_mode = attr->va_mode | inode_type;
  97        if (attr->va_uid != -1) 
  98                inode->i_uid = make_kuid(&init_user_ns, (uid_t) attr->va_uid);
  99        if (attr->va_gid != -1)
 100                inode->i_gid = make_kgid(&init_user_ns, (gid_t) attr->va_gid);
 101        if (attr->va_nlink != -1)
 102                set_nlink(inode, attr->va_nlink);
 103        if (attr->va_size != -1)
 104                inode->i_size = attr->va_size;
 105        if (attr->va_size != -1)
 106                inode->i_blocks = (attr->va_size + 511) >> 9;
 107        if (attr->va_atime.tv_sec != -1) 
 108                inode->i_atime = timespec_to_timespec64(attr->va_atime);
 109        if (attr->va_mtime.tv_sec != -1)
 110                inode->i_mtime = timespec_to_timespec64(attr->va_mtime);
 111        if (attr->va_ctime.tv_sec != -1)
 112                inode->i_ctime = timespec_to_timespec64(attr->va_ctime);
 113}
 114
 115
 116/* 
 117 * BSD sets attributes that need not be modified to -1. 
 118 * Linux uses the valid field to indicate what should be
 119 * looked at.  The BSD type field needs to be deduced from linux 
 120 * mode.
 121 * So we have to do some translations here.
 122 */
 123
 124void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
 125{
 126        unsigned int valid;
 127
 128        /* clean out */        
 129        vattr->va_mode = -1;
 130        vattr->va_uid = (vuid_t) -1; 
 131        vattr->va_gid = (vgid_t) -1;
 132        vattr->va_size = (off_t) -1;
 133        vattr->va_atime.tv_sec = (time_t) -1;
 134        vattr->va_atime.tv_nsec =  (time_t) -1;
 135        vattr->va_mtime.tv_sec = (time_t) -1;
 136        vattr->va_mtime.tv_nsec = (time_t) -1;
 137        vattr->va_ctime.tv_sec = (time_t) -1;
 138        vattr->va_ctime.tv_nsec = (time_t) -1;
 139        vattr->va_type = C_VNON;
 140        vattr->va_fileid = -1;
 141        vattr->va_gen = -1;
 142        vattr->va_bytes = -1;
 143        vattr->va_nlink = -1;
 144        vattr->va_blocksize = -1;
 145        vattr->va_rdev = -1;
 146        vattr->va_flags = 0;
 147
 148        /* determine the type */
 149#if 0
 150        mode = iattr->ia_mode;
 151                if ( S_ISDIR(mode) ) {
 152                vattr->va_type = C_VDIR; 
 153        } else if ( S_ISREG(mode) ) {
 154                vattr->va_type = C_VREG;
 155        } else if ( S_ISLNK(mode) ) {
 156                vattr->va_type = C_VLNK;
 157        } else {
 158                /* don't do others */
 159                vattr->va_type = C_VNON;
 160        }
 161#endif 
 162
 163        /* set those vattrs that need change */
 164        valid = iattr->ia_valid;
 165        if ( valid & ATTR_MODE ) {
 166                vattr->va_mode = iattr->ia_mode;
 167        }
 168        if ( valid & ATTR_UID ) {
 169                vattr->va_uid = (vuid_t) from_kuid(&init_user_ns, iattr->ia_uid);
 170        }
 171        if ( valid & ATTR_GID ) {
 172                vattr->va_gid = (vgid_t) from_kgid(&init_user_ns, iattr->ia_gid);
 173        }
 174        if ( valid & ATTR_SIZE ) {
 175                vattr->va_size = iattr->ia_size;
 176        }
 177        if ( valid & ATTR_ATIME ) {
 178                vattr->va_atime = timespec64_to_timespec(iattr->ia_atime);
 179        }
 180        if ( valid & ATTR_MTIME ) {
 181                vattr->va_mtime = timespec64_to_timespec(iattr->ia_mtime);
 182        }
 183        if ( valid & ATTR_CTIME ) {
 184                vattr->va_ctime = timespec64_to_timespec(iattr->ia_ctime);
 185        }
 186}
 187
 188