release/src-rt-6.x.4708/linux/linux-2.6.36/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 static 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(qstr->name, &l);
  24         /*if (hpfs_chk_name(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
  37 static 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(a->name, &al);
  42         /*hpfs_adjust_length(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(b->name, &bl))
  48                 return 1;
  49         if (hpfs_compare_names(dentry->d_sb, a->name, al, b->name, bl, 0))
  50                 return 1;
  51         return 0;
  52 }
  53
  54 static const struct dentry_operations hpfs_dentry_operations = {
  55         .d_hash         = hpfs_hash_dentry,
  56         .d_compare      = hpfs_compare_dentry,
  57 };
  58
  59 void hpfs_set_dentry_operations(struct dentry *dentry)
  60 {
  61         dentry->d_op = &hpfs_dentry_operations;
  62 }