LXR linux/fs/hpfs/dentry.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *  linux/fs/hpfs/dentry.c
   4 *
   5 *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
   6 *
   7 *  dcache operations
   8 */
   9
  10#include "hpfs_fn.h"
  11
  12/*
  13 * Note: the dentry argument is the parent dentry.
  14 */
  15
  16static int hpfs_hash_dentry(const struct dentry *dentry, struct qstr *qstr)
  17{
  18        unsigned long    hash;
  19        int              i;
  20        unsigned l = qstr->len;
  21
  22        if (l == 1) if (qstr->name[0]=='.') goto x;
  23        if (l == 2) if (qstr->name[0]=='.' || qstr->name[1]=='.') goto x;
  24        hpfs_adjust_length(qstr->name, &l);
  25        /*if (hpfs_chk_name(qstr->name,&l))*/
  26                /*return -ENAMETOOLONG;*/
  27                /*return -ENOENT;*/
  28        x:
  29
  30        hash = init_name_hash(dentry);
  31        for (i = 0; i < l; i++)
  32                hash = partial_name_hash(hpfs_upcase(hpfs_sb(dentry->d_sb)->sb_cp_table,qstr->name[i]), hash);
  33        qstr->hash = end_name_hash(hash);
  34
  35        return 0;
  36}
  37
  38static int hpfs_compare_dentry(const struct dentry *dentry,
  39                unsigned int len, const char *str, const struct qstr *name)
  40{
  41        unsigned al = len;
  42        unsigned bl = name->len;
  43
  44        hpfs_adjust_length(str, &al);
  45        /*hpfs_adjust_length(b->name, &bl);*/
  46
  47        /*
  48         * 'str' is the nane of an already existing dentry, so the name
  49         * must be valid. 'name' must be validated first.
  50         */
  51
  52        if (hpfs_chk_name(name->name, &bl))
  53                return 1;
  54        if (hpfs_compare_names(dentry->d_sb, str, al, name->name, bl, 0))
  55                return 1;
  56        return 0;
  57}
  58
  59const struct dentry_operations hpfs_dentry_operations = {
  60        .d_hash         = hpfs_hash_dentry,
  61        .d_compare      = hpfs_compare_dentry,
  62};
  63