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 #ifdef CONFIG_CODA_FS_OLD_API
  32         sprintf(s, "(%08x.%08x.%08x)", f->opaque[0], f->opaque[1], f->opaque[2]);
  33 #else
  34         sprintf(s, "(%08x.%08x.%08x.%08x)", f->opaque[0], f->opaque[1], f->opaque[2], f->opaque[3]);
  35 #endif
  36         return s;
  37 }
  38
  39 /* recognize special .CONTROL name */
  40 int coda_iscontrol(const char *name, size_t length)
  41 {
  42         return ((CODA_CONTROLLEN == length) &&
  43                 (strncmp(name, CODA_CONTROL, CODA_CONTROLLEN) == 0));
  44 }
  45
  46 /* recognize /coda inode */
  47 int coda_isroot(struct inode *i)
  48 {
  49     return ( i->i_sb->s_root->d_inode == i );
  50 }
  51
  52 unsigned short coda_flags_to_cflags(unsigned short flags)
  53 {
  54         unsigned short coda_flags = 0;
  55
  56         if ((flags & O_ACCMODE) == O_RDONLY)
  57                 coda_flags |= C_O_READ;
  58
  59         if ((flags & O_ACCMODE) == O_RDWR)
  60                 coda_flags |= C_O_READ | C_O_WRITE;
  61
  62         if ((flags & O_ACCMODE) == O_WRONLY)
  63                 coda_flags |= C_O_WRITE;
  64
  65         if (flags & O_TRUNC)
  66                 coda_flags |= C_O_TRUNC;
  67
  68         if (flags & O_CREAT)
  69                 coda_flags |= C_O_CREAT;
  70
  71         if (flags & O_EXCL)
  72                 coda_flags |= C_O_EXCL;
  73
  74         return coda_flags;
  75 }
  76
  77
  78 /* utility functions below */
  79 void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
  80 {
  81         int inode_type;
  82         /* inode's i_flags, i_ino are set by iget
  83            XXX: is this all we need ??
  84            */
  85         switch (attr->va_type) {
  86         case C_VNON:
  87                 inode_type  = 0;
  88                 break;
  89         case C_VREG:
  90                 inode_type = S_IFREG;
  91                 break;
  92         case C_VDIR:
  93                 inode_type = S_IFDIR;
  94                 break;
  95         case C_VLNK:
  96                 inode_type = S_IFLNK;
  97                 break;
  98         default:
  99                 inode_type = 0;
 100         }
 101         inode->i_mode |= inode_type;
 102
 103         if (attr->va_mode != (u_short) -1)
 104                 inode->i_mode = attr->va_mode | inode_type;
 105         if (attr->va_uid != -1)
 106                 inode->i_uid = (uid_t) attr->va_uid;
 107         if (attr->va_gid != -1)
 108                 inode->i_gid = (gid_t) attr->va_gid;
 109         if (attr->va_nlink != -1)
 110                 inode->i_nlink = attr->va_nlink;
 111         if (attr->va_size != -1)
 112                 inode->i_size = attr->va_size;
 113         if (attr->va_size != -1)
 114                 inode->i_blocks = (attr->va_size + 511) >> 9;
 115         if (attr->va_atime.tv_sec != -1)
 116                 inode->i_atime = attr->va_atime;
 117         if (attr->va_mtime.tv_sec != -1)
 118                 inode->i_mtime = attr->va_mtime;
 119         if (attr->va_ctime.tv_sec != -1)
 120                 inode->i_ctime = attr->va_ctime;
 121 }
 122
 123
 124 /*
 125  * BSD sets attributes that need not be modified to -1.
 126  * Linux uses the valid field to indicate what should be
 127  * looked at.  The BSD type field needs to be deduced from linux
 128  * mode.
 129  * So we have to do some translations here.
 130  */
 131
 132 void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
 133 {
 134         unsigned int valid;
 135
 136         /* clean out */
 137         vattr->va_mode = (umode_t) -1;
 138         vattr->va_uid = (vuid_t) -1;
 139         vattr->va_gid = (vgid_t) -1;
 140         vattr->va_size = (off_t) -1;
 141         vattr->va_atime.tv_sec = (time_t) -1;
 142         vattr->va_atime.tv_nsec =  (time_t) -1;
 143         vattr->va_mtime.tv_sec = (time_t) -1;
 144         vattr->va_mtime.tv_nsec = (time_t) -1;
 145         vattr->va_ctime.tv_sec = (time_t) -1;
 146         vattr->va_ctime.tv_nsec = (time_t) -1;
 147         vattr->va_type = C_VNON;
 148         vattr->va_fileid = -1;
 149         vattr->va_gen = -1;
 150         vattr->va_bytes = -1;
 151         vattr->va_nlink = -1;
 152         vattr->va_blocksize = -1;
 153         vattr->va_rdev = -1;
 154         vattr->va_flags = 0;
 155
 156         /* determine the type */
 157 #if 0
 158         mode = iattr->ia_mode;
 159                 if ( S_ISDIR(mode) ) {
 160                 vattr->va_type = C_VDIR;
 161         } else if ( S_ISREG(mode) ) {
 162                 vattr->va_type = C_VREG;
 163         } else if ( S_ISLNK(mode) ) {
 164                 vattr->va_type = C_VLNK;
 165         } else {
 166                 /* don't do others */
 167                 vattr->va_type = C_VNON;
 168         }
 169 #endif
 170
 171         /* set those vattrs that need change */
 172         valid = iattr->ia_valid;
 173         if ( valid & ATTR_MODE ) {
 174                 vattr->va_mode = iattr->ia_mode;
 175         }
 176         if ( valid & ATTR_UID ) {
 177                 vattr->va_uid = (vuid_t) iattr->ia_uid;
 178         }
 179         if ( valid & ATTR_GID ) {
 180                 vattr->va_gid = (vgid_t) iattr->ia_gid;
 181         }
 182         if ( valid & ATTR_SIZE ) {
 183                 vattr->va_size = iattr->ia_size;
 184         }
 185         if ( valid & ATTR_ATIME ) {
 186                 vattr->va_atime = iattr->ia_atime;
 187         }
 188         if ( valid & ATTR_MTIME ) {
 189                 vattr->va_mtime = iattr->ia_mtime;
 190         }
 191         if ( valid & ATTR_CTIME ) {
 192                 vattr->va_ctime = iattr->ia_ctime;
 193         }
 194 }
 195