fs/coda/coda_linux.c

   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 */
  25 int coda_fake_statfs;
  26
  27 /* print a fid */
  28 char * 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 */
  38 int coda_iscontrol(const char *name, size_t length)
  39 {
  40         return ((CODA_CONTROLLEN == length) &&
  41                 (strncmp(name, CODA_CONTROL, CODA_CONTROLLEN) == 0));
  42 }
  43
  44 unsigned 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 */
  71 void 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
 124 void 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