LXR linux/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
  15static 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(hpfs_sb(dentry->d_sb)->sb_cp_table,qstr->name[i]), hash);
  32        qstr->hash = end_name_hash(hash);
  33
  34        return 0;
  35}
  36
  37static 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
  52static struct dentry_operations hpfs_dentry_operations = {
  53        .d_hash         = hpfs_hash_dentry,
  54        .d_compare      = hpfs_compare_dentry,
  55};
  56
  57void hpfs_set_dentry_operations(struct dentry *dentry)
  58{
  59        dentry->d_op = &hpfs_dentry_operations;
  60}
  61