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 <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 */
  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 /* recognize /coda inode */
  44 int coda_isroot(struct inode *i)
  45 {
  46     return ( i->i_sb->s_root->d_inode == i );
  47 }
  48
  49 unsigned 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 */
  76 void 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 = make_kuid(&init_user_ns, (uid_t) attr->va_uid);
 104         if (attr->va_gid != -1)
 105                 inode->i_gid = make_kgid(&init_user_ns, (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
 129 void 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) from_kuid(&init_user_ns, iattr->ia_uid);
 175         }
 176         if ( valid & ATTR_GID ) {
 177                 vattr->va_gid = (vgid_t) from_kgid(&init_user_ns, 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