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 "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 static struct timespec64 coda_to_timespec64(struct coda_timespec ts)
  70 {
  71         struct timespec64 ts64 = {
  72                 .tv_sec = ts.tv_sec,
  73                 .tv_nsec = ts.tv_nsec,
  74         };
  75
  76         return ts64;
  77 }
  78
  79 static struct coda_timespec timespec64_to_coda(struct timespec64 ts64)
  80 {
  81         struct coda_timespec ts = {
  82                 .tv_sec = ts64.tv_sec,
  83                 .tv_nsec = ts64.tv_nsec,
  84         };
  85
  86         return ts;
  87 }
  88
  89 /* utility functions below */
  90 void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
  91 {
  92         int inode_type;
  93         /* inode's i_flags, i_ino are set by iget
  94            XXX: is this all we need ??
  95            */
  96         switch (attr->va_type) {
  97         case C_VNON:
  98                 inode_type  = 0;
  99                 break;
 100         case C_VREG:
 101                 inode_type = S_IFREG;
 102                 break;
 103         case C_VDIR:
 104                 inode_type = S_IFDIR;
 105                 break;
 106         case C_VLNK:
 107                 inode_type = S_IFLNK;
 108                 break;
 109         default:
 110                 inode_type = 0;
 111         }
 112         inode->i_mode |= inode_type;
 113
 114         if (attr->va_mode != (u_short) -1)
 115                 inode->i_mode = attr->va_mode | inode_type;
 116         if (attr->va_uid != -1)
 117                 inode->i_uid = make_kuid(&init_user_ns, (uid_t) attr->va_uid);
 118         if (attr->va_gid != -1)
 119                 inode->i_gid = make_kgid(&init_user_ns, (gid_t) attr->va_gid);
 120         if (attr->va_nlink != -1)
 121                 set_nlink(inode, attr->va_nlink);
 122         if (attr->va_size != -1)
 123                 inode->i_size = attr->va_size;
 124         if (attr->va_size != -1)
 125                 inode->i_blocks = (attr->va_size + 511) >> 9;
 126         if (attr->va_atime.tv_sec != -1)
 127                 inode->i_atime = coda_to_timespec64(attr->va_atime);
 128         if (attr->va_mtime.tv_sec != -1)
 129                 inode->i_mtime = coda_to_timespec64(attr->va_mtime);
 130         if (attr->va_ctime.tv_sec != -1)
 131                 inode->i_ctime = coda_to_timespec64(attr->va_ctime);
 132 }
 133
 134
 135 /*
 136  * BSD sets attributes that need not be modified to -1.
 137  * Linux uses the valid field to indicate what should be
 138  * looked at.  The BSD type field needs to be deduced from linux
 139  * mode.
 140  * So we have to do some translations here.
 141  */
 142
 143 void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
 144 {
 145         unsigned int valid;
 146
 147         /* clean out */
 148         vattr->va_mode = -1;
 149         vattr->va_uid = (vuid_t) -1;
 150         vattr->va_gid = (vgid_t) -1;
 151         vattr->va_size = (off_t) -1;
 152         vattr->va_atime.tv_sec = (int64_t) -1;
 153         vattr->va_atime.tv_nsec = (long) -1;
 154         vattr->va_mtime.tv_sec = (int64_t) -1;
 155         vattr->va_mtime.tv_nsec = (long) -1;
 156         vattr->va_ctime.tv_sec = (int64_t) -1;
 157         vattr->va_ctime.tv_nsec = (long) -1;
 158         vattr->va_type = C_VNON;
 159         vattr->va_fileid = -1;
 160         vattr->va_gen = -1;
 161         vattr->va_bytes = -1;
 162         vattr->va_nlink = -1;
 163         vattr->va_blocksize = -1;
 164         vattr->va_rdev = -1;
 165         vattr->va_flags = 0;
 166
 167         /* determine the type */
 168 #if 0
 169         mode = iattr->ia_mode;
 170                 if ( S_ISDIR(mode) ) {
 171                 vattr->va_type = C_VDIR;
 172         } else if ( S_ISREG(mode) ) {
 173                 vattr->va_type = C_VREG;
 174         } else if ( S_ISLNK(mode) ) {
 175                 vattr->va_type = C_VLNK;
 176         } else {
 177                 /* don't do others */
 178                 vattr->va_type = C_VNON;
 179         }
 180 #endif
 181
 182         /* set those vattrs that need change */
 183         valid = iattr->ia_valid;
 184         if ( valid & ATTR_MODE ) {
 185                 vattr->va_mode = iattr->ia_mode;
 186         }
 187         if ( valid & ATTR_UID ) {
 188                 vattr->va_uid = (vuid_t) from_kuid(&init_user_ns, iattr->ia_uid);
 189         }
 190         if ( valid & ATTR_GID ) {
 191                 vattr->va_gid = (vgid_t) from_kgid(&init_user_ns, iattr->ia_gid);
 192         }
 193         if ( valid & ATTR_SIZE ) {
 194                 vattr->va_size = iattr->ia_size;
 195         }
 196         if ( valid & ATTR_ATIME ) {
 197                 vattr->va_atime = timespec64_to_coda(iattr->ia_atime);
 198         }
 199         if ( valid & ATTR_MTIME ) {
 200                 vattr->va_mtime = timespec64_to_coda(iattr->ia_mtime);
 201         }
 202         if ( valid & ATTR_CTIME ) {
 203                 vattr->va_ctime = timespec64_to_coda(iattr->ia_ctime);
 204         }
 205 }
 206