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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * DFS referral cache routines
4 *
5 * Copyright (c) 2018-2019 Paulo Alcantara <palcantara@suse.de>
6 */
7
8#ifndef _CIFS_DFS_CACHE_H
9#define _CIFS_DFS_CACHE_H
10
11#include <linux/nls.h>
12#include <linux/list.h>
13#include "cifsglob.h"
14
15struct dfs_cache_tgt_list {
16 int tl_numtgts;
17 struct list_head tl_list;
18};
19
20struct dfs_cache_tgt_iterator {
21 char *it_name;
22 struct list_head it_list;
23};
24
25extern int dfs_cache_init(void);
26extern void dfs_cache_destroy(void);
27extern const struct proc_ops dfscache_proc_ops;
28
29extern int dfs_cache_find(const unsigned int xid, struct cifs_ses *ses,
30 const struct nls_table *nls_codepage, int remap,
31 const char *path, struct dfs_info3_param *ref,
32 struct dfs_cache_tgt_list *tgt_list);
33extern int dfs_cache_noreq_find(const char *path, struct dfs_info3_param *ref,
34 struct dfs_cache_tgt_list *tgt_list);
35extern int dfs_cache_update_tgthint(const unsigned int xid,
36 struct cifs_ses *ses,
37 const struct nls_table *nls_codepage,
38 int remap, const char *path,
39 const struct dfs_cache_tgt_iterator *it);
40extern int
41dfs_cache_noreq_update_tgthint(const char *path,
42 const struct dfs_cache_tgt_iterator *it);
43extern int dfs_cache_get_tgt_referral(const char *path,
44 const struct dfs_cache_tgt_iterator *it,
45 struct dfs_info3_param *ref);
46extern int dfs_cache_add_vol(char *mntdata, struct smb_vol *vol,
47 const char *fullpath);
48extern int dfs_cache_update_vol(const char *fullpath,
49 struct TCP_Server_Info *server);
50extern void dfs_cache_del_vol(const char *fullpath);
51
52extern int dfs_cache_get_tgt_share(const struct dfs_cache_tgt_iterator *it,
53 const char **share, size_t *share_len,
54 const char **prefix, size_t *prefix_len);
55
56static inline struct dfs_cache_tgt_iterator *
57dfs_cache_get_next_tgt(struct dfs_cache_tgt_list *tl,
58 struct dfs_cache_tgt_iterator *it)
59{
60 if (!tl || list_empty(&tl->tl_list) || !it ||
61 list_is_last(&it->it_list, &tl->tl_list))
62 return NULL;
63 return list_next_entry(it, it_list);
64}
65
66static inline struct dfs_cache_tgt_iterator *
67dfs_cache_get_tgt_iterator(struct dfs_cache_tgt_list *tl)
68{
69 if (!tl)
70 return NULL;
71 return list_first_entry_or_null(&tl->tl_list,
72 struct dfs_cache_tgt_iterator,
73 it_list);
74}
75
76static inline void dfs_cache_free_tgts(struct dfs_cache_tgt_list *tl)
77{
78 struct dfs_cache_tgt_iterator *it, *nit;
79
80 if (!tl || list_empty(&tl->tl_list))
81 return;
82 list_for_each_entry_safe(it, nit, &tl->tl_list, it_list) {
83 list_del(&it->it_list);
84 kfree(it->it_name);
85 kfree(it);
86 }
87 tl->tl_numtgts = 0;
88}
89
90static inline const char *
91dfs_cache_get_tgt_name(const struct dfs_cache_tgt_iterator *it)
92{
93 return it ? it->it_name : NULL;
94}
95
96static inline int
97dfs_cache_get_nr_tgts(const struct dfs_cache_tgt_list *tl)
98{
99 return tl ? tl->tl_numtgts : 0;
100}
101
102#endif /* _CIFS_DFS_CACHE_H */