i386/linux/linux-2.3.21/fs/hpfs/dentry.c

   1 /*
   2  *  linux/fs/hpfs/dentry.c
   3  *
   4  *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
   5  *
   6  *  dcache operations
   7  */
   8
   9 #include "hpfs_fn.h"
  10
  11 /*
  12  * Note: the dentry argument is the parent dentry.
  13  */
  14
  15 int hpfs_hash_dentry(struct dentry *dentry, struct qstr *qstr)
  16 {
  17         unsigned long    hash;
  18         int              i;
  19         unsigned l = qstr->len;
  20
  21         if (l == 1) if (qstr->name[0]=='.') goto x;
  22         if (l == 2) if (qstr->name[0]=='.' || qstr->name[1]=='.') goto x;
  23         hpfs_adjust_length((char *)qstr->name, &l);
  24         /*if (hpfs_chk_name((char *)qstr->name,&l))*/
  25                 /*return -ENAMETOOLONG;*/
  26                 /*return -ENOENT;*/
  27         x:
  28
  29         hash = init_name_hash();
  30         for (i = 0; i < l; i++)
  31                 hash = partial_name_hash(hpfs_upcase(dentry->d_sb->s_hpfs_cp_table,qstr->name[i]), hash);
  32         qstr->hash = end_name_hash(hash);
  33
  34         return 0;
  35 }
  36
  37 int hpfs_compare_dentry(struct dentry *dentry, struct qstr *a, struct qstr *b)
  38 {
  39         unsigned al=a->len;
  40         unsigned bl=b->len;
  41         hpfs_adjust_length((char *)a->name, &al);
  42         /*hpfs_adjust_length((char *)b->name, &bl);*/
  43         /* 'a' is the qstr of an already existing dentry, so the name
  44          * must be valid. 'b' must be validated first.
  45          */
  46
  47         if (hpfs_chk_name((char *)b->name, &bl)) return 1;
  48         if (hpfs_compare_names(dentry->d_sb, (char *)a->name, al, (char *)b->name, bl, 0)) return 1;
  49         return 0;
  50 }
  51
  52 struct dentry_operations hpfs_dentry_operations = {
  53         NULL,                   /* d_validate   */
  54         hpfs_hash_dentry,       /* d_hash       */
  55         hpfs_compare_dentry,    /* d_compare    */
  56         NULL                    /* d_delete     */
  57 };
  58
  59 void hpfs_set_dentry_operations(struct dentry *dentry)
  60 {
  61         dentry->d_op = &hpfs_dentry_operations;
  62 }