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
hpfs_hash_dentry(const struct dentry * dentry,struct qstr * qstr)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
hpfs_compare_dentry(const struct dentry * dentry,unsigned int len,const char * str,const struct qstr * name)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 };
63