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_linux.h>
  21 #include <linux/coda_psdev.h>
  22 #include <linux/coda_fs_i.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 /* recognize /coda inode */
  45 int coda_isroot(struct inode *i)
  46 {
  47     return ( i->i_sb->s_root->d_inode == i );
  48 }
  49
  50 unsigned short coda_flags_to_cflags(unsigned short flags)
  51 {
  52         unsigned short coda_flags = 0;
  53
  54         if ((flags & O_ACCMODE) == O_RDONLY)
  55                 coda_flags |= C_O_READ;
  56
  57         if ((flags & O_ACCMODE) == O_RDWR)
  58                 coda_flags |= C_O_READ | C_O_WRITE;
  59
  60         if ((flags & O_ACCMODE) == O_WRONLY)
  61                 coda_flags |= C_O_WRITE;
  62
  63         if (flags & O_TRUNC)
  64                 coda_flags |= C_O_TRUNC;
  65
  66         if (flags & O_CREAT)
  67                 coda_flags |= C_O_CREAT;
  68
  69         if (flags & O_EXCL)
  70                 coda_flags |= C_O_EXCL;
  71
  72         return coda_flags;
  73 }
  74
  75
  76 /* utility functions below */
  77 void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
  78 {
  79         int inode_type;
  80         /* inode's i_flags, i_ino are set by iget
  81            XXX: is this all we need ??
  82            */
  83         switch (attr->va_type) {
  84         case C_VNON:
  85                 inode_type  = 0;
  86                 break;
  87         case C_VREG:
  88                 inode_type = S_IFREG;
  89                 break;
  90         case C_VDIR:
  91                 inode_type = S_IFDIR;
  92                 break;
  93         case C_VLNK:
  94                 inode_type = S_IFLNK;
  95                 break;
  96         default:
  97                 inode_type = 0;
  98         }
  99         inode->i_mode |= inode_type;
 100
 101         if (attr->va_mode != (u_short) -1)
 102                 inode->i_mode = attr->va_mode | inode_type;
 103         if (attr->va_uid != -1)
 104                 inode->i_uid = (uid_t) attr->va_uid;
 105         if (attr->va_gid != -1)
 106                 inode->i_gid = (gid_t) attr->va_gid;
 107         if (attr->va_nlink != -1)
 108                 inode->i_nlink = attr->va_nlink;
 109         if (attr->va_size != -1)
 110                 inode->i_size = attr->va_size;
 111         if (attr->va_size != -1)
 112                 inode->i_blocks = (attr->va_size + 511) >> 9;
 113         if (attr->va_atime.tv_sec != -1)
 114                 inode->i_atime = attr->va_atime;
 115         if (attr->va_mtime.tv_sec != -1)
 116                 inode->i_mtime = attr->va_mtime;
 117         if (attr->va_ctime.tv_sec != -1)
 118                 inode->i_ctime = attr->va_ctime;
 119 }
 120
 121
 122 /*
 123  * BSD sets attributes that need not be modified to -1.
 124  * Linux uses the valid field to indicate what should be
 125  * looked at.  The BSD type field needs to be deduced from linux
 126  * mode.
 127  * So we have to do some translations here.
 128  */
 129
 130 void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
 131 {
 132         unsigned int valid;
 133
 134         /* clean out */
 135         vattr->va_mode = -1;
 136         vattr->va_uid = (vuid_t) -1;
 137         vattr->va_gid = (vgid_t) -1;
 138         vattr->va_size = (off_t) -1;
 139         vattr->va_atime.tv_sec = (time_t) -1;
 140         vattr->va_atime.tv_nsec =  (time_t) -1;
 141         vattr->va_mtime.tv_sec = (time_t) -1;
 142         vattr->va_mtime.tv_nsec = (time_t) -1;
 143         vattr->va_ctime.tv_sec = (time_t) -1;
 144         vattr->va_ctime.tv_nsec = (time_t) -1;
 145         vattr->va_type = C_VNON;
 146         vattr->va_fileid = -1;
 147         vattr->va_gen = -1;
 148         vattr->va_bytes = -1;
 149         vattr->va_nlink = -1;
 150         vattr->va_blocksize = -1;
 151         vattr->va_rdev = -1;
 152         vattr->va_flags = 0;
 153
 154         /* determine the type */
 155 #if 0
 156         mode = iattr->ia_mode;
 157                 if ( S_ISDIR(mode) ) {
 158                 vattr->va_type = C_VDIR;
 159         } else if ( S_ISREG(mode) ) {
 160                 vattr->va_type = C_VREG;
 161         } else if ( S_ISLNK(mode) ) {
 162                 vattr->va_type = C_VLNK;
 163         } else {
 164                 /* don't do others */
 165                 vattr->va_type = C_VNON;
 166         }
 167 #endif
 168
 169         /* set those vattrs that need change */
 170         valid = iattr->ia_valid;
 171         if ( valid & ATTR_MODE ) {
 172                 vattr->va_mode = iattr->ia_mode;
 173         }
 174         if ( valid & ATTR_UID ) {
 175                 vattr->va_uid = (vuid_t) iattr->ia_uid;
 176         }
 177         if ( valid & ATTR_GID ) {
 178                 vattr->va_gid = (vgid_t) iattr->ia_gid;
 179         }
 180         if ( valid & ATTR_SIZE ) {
 181                 vattr->va_size = iattr->ia_size;
 182         }
 183         if ( valid & ATTR_ATIME ) {
 184                 vattr->va_atime = iattr->ia_atime;
 185         }
 186         if ( valid & ATTR_MTIME ) {
 187                 vattr->va_mtime = iattr->ia_mtime;
 188         }
 189         if ( valid & ATTR_CTIME ) {
 190                 vattr->va_ctime = iattr->ia_ctime;
 191         }
 192 }
 193