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