root/fs/hpfs/dentry.c

DEFINITIONS

1. hpfs_hash_dentry
2. hpfs_compare_dentry

   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 
  16 static 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 
  38 static 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 
  59 const struct dentry_operations hpfs_dentry_operations = {
  60         .d_hash         = hpfs_hash_dentry,
  61         .d_compare      = hpfs_compare_dentry,
  62 };