fs/coda/coda_linux.c

   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 */
  24 int coda_fake_statfs;
  25
  26 /* print a fid */
  27 char * 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 */
  37 int 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 unsigned 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 */
  70 void 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
 123 void 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