release/src-rt-6.x.4708/linux/linux-2.6.36/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         switch (attr->va_type) {
  81         case C_VNON:
  82                 inode_type  = 0;
  83                 break;
  84         case C_VREG:
  85                 inode_type = S_IFREG;
  86                 break;
  87         case C_VDIR:
  88                 inode_type = S_IFDIR;
  89                 break;
  90         case C_VLNK:
  91                 inode_type = S_IFLNK;
  92                 break;
  93         default:
  94                 inode_type = 0;
  95         }
  96         inode->i_mode |= inode_type;
  97
  98         if (attr->va_mode != (u_short) -1)
  99                 inode->i_mode = attr->va_mode | inode_type;
 100         if (attr->va_uid != -1)
 101                 inode->i_uid = (uid_t) attr->va_uid;
 102         if (attr->va_gid != -1)
 103                 inode->i_gid = (gid_t) attr->va_gid;
 104         if (attr->va_nlink != -1)
 105                 inode->i_nlink = attr->va_nlink;
 106         if (attr->va_size != -1)
 107                 inode->i_size = attr->va_size;
 108         if (attr->va_size != -1)
 109                 inode->i_blocks = (attr->va_size + 511) >> 9;
 110         if (attr->va_atime.tv_sec != -1)
 111                 inode->i_atime = attr->va_atime;
 112         if (attr->va_mtime.tv_sec != -1)
 113                 inode->i_mtime = attr->va_mtime;
 114         if (attr->va_ctime.tv_sec != -1)
 115                 inode->i_ctime = attr->va_ctime;
 116 }
 117
 118
 119 /*
 120  * BSD sets attributes that need not be modified to -1.
 121  * Linux uses the valid field to indicate what should be
 122  * looked at.  The BSD type field needs to be deduced from linux
 123  * mode.
 124  * So we have to do some translations here.
 125  */
 126
 127 void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
 128 {
 129         unsigned int valid;
 130
 131         /* clean out */
 132         vattr->va_mode = -1;
 133         vattr->va_uid = (vuid_t) -1;
 134         vattr->va_gid = (vgid_t) -1;
 135         vattr->va_size = (off_t) -1;
 136         vattr->va_atime.tv_sec = (time_t) -1;
 137         vattr->va_atime.tv_nsec =  (time_t) -1;
 138         vattr->va_mtime.tv_sec = (time_t) -1;
 139         vattr->va_mtime.tv_nsec = (time_t) -1;
 140         vattr->va_ctime.tv_sec = (time_t) -1;
 141         vattr->va_ctime.tv_nsec = (time_t) -1;
 142         vattr->va_type = C_VNON;
 143         vattr->va_fileid = -1;
 144         vattr->va_gen = -1;
 145         vattr->va_bytes = -1;
 146         vattr->va_nlink = -1;
 147         vattr->va_blocksize = -1;
 148         vattr->va_rdev = -1;
 149         vattr->va_flags = 0;
 150
 151         /* determine the type */
 152
 153         /* set those vattrs that need change */
 154         valid = iattr->ia_valid;
 155         if ( valid & ATTR_MODE ) {
 156                 vattr->va_mode = iattr->ia_mode;
 157         }
 158         if ( valid & ATTR_UID ) {
 159                 vattr->va_uid = (vuid_t) iattr->ia_uid;
 160         }
 161         if ( valid & ATTR_GID ) {
 162                 vattr->va_gid = (vgid_t) iattr->ia_gid;
 163         }
 164         if ( valid & ATTR_SIZE ) {
 165                 vattr->va_size = iattr->ia_size;
 166         }
 167         if ( valid & ATTR_ATIME ) {
 168                 vattr->va_atime = iattr->ia_atime;
 169         }
 170         if ( valid & ATTR_MTIME ) {
 171                 vattr->va_mtime = iattr->ia_mtime;
 172         }
 173         if ( valid & ATTR_CTIME ) {
 174                 vattr->va_ctime = iattr->ia_ctime;
 175         }
 176 }