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(const struct dentry *dentry, const struct inode *inode,
  16                 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();
  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 *parent,
  39                 const struct inode *pinode,
  40                 const struct dentry *dentry, const struct inode *inode,
  41                 unsigned int len, const char *str, const struct qstr *name)
  42 {
  43         unsigned al = len;
  44         unsigned bl = name->len;
  45
  46         hpfs_adjust_length(str, &al);
  47         /*hpfs_adjust_length(b->name, &bl);*/
  48
  49         /*
  50          * 'str' is the nane of an already existing dentry, so the name
  51          * must be valid. 'name' must be validated first.
  52          */
  53
  54         if (hpfs_chk_name(name->name, &bl))
  55                 return 1;
  56         if (hpfs_compare_names(parent->d_sb, str, al, name->name, bl, 0))
  57                 return 1;
  58         return 0;
  59 }
  60
  61 static const struct dentry_operations hpfs_dentry_operations = {
  62         .d_hash         = hpfs_hash_dentry,
  63         .d_compare      = hpfs_compare_dentry,
  64 };
  65
  66 void hpfs_set_dentry_operations(struct dentry *dentry)
  67 {
  68         d_set_d_op(dentry, &hpfs_dentry_operations);
  69 }