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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 <linux/uuid.h>
14#include "cifsglob.h"
15
16#define DFS_CACHE_TGT_LIST_INIT(var) { .tl_numtgts = 0, .tl_list = LIST_HEAD_INIT((var).tl_list), }
17
18struct dfs_cache_tgt_list {
19 int tl_numtgts;
20 struct list_head tl_list;
21};
22
23struct dfs_cache_tgt_iterator {
24 char *it_name;
25 int it_path_consumed;
26 struct list_head it_list;
27};
28
29int dfs_cache_init(void);
30void dfs_cache_destroy(void);
31extern const struct proc_ops dfscache_proc_ops;
32
33int dfs_cache_find(const unsigned int xid, struct cifs_ses *ses, const struct nls_table *cp,
34 int remap, const char *path, struct dfs_info3_param *ref,
35 struct dfs_cache_tgt_list *tgt_list);
36int dfs_cache_noreq_find(const char *path, struct dfs_info3_param *ref,
37 struct dfs_cache_tgt_list *tgt_list);
38void dfs_cache_noreq_update_tgthint(const char *path, const struct dfs_cache_tgt_iterator *it);
39int dfs_cache_get_tgt_referral(const char *path, const struct dfs_cache_tgt_iterator *it,
40 struct dfs_info3_param *ref);
41int dfs_cache_get_tgt_share(char *path, const struct dfs_cache_tgt_iterator *it, char **share,
42 char **prefix);
43char *dfs_cache_canonical_path(const char *path, const struct nls_table *cp, int remap);
44int dfs_cache_remount_fs(struct cifs_sb_info *cifs_sb);
45
46static inline struct dfs_cache_tgt_iterator *
47dfs_cache_get_next_tgt(struct dfs_cache_tgt_list *tl,
48 struct dfs_cache_tgt_iterator *it)
49{
50 if (!tl || list_empty(&tl->tl_list) || !it ||
51 list_is_last(&it->it_list, &tl->tl_list))
52 return NULL;
53 return list_next_entry(it, it_list);
54}
55
56static inline struct dfs_cache_tgt_iterator *
57dfs_cache_get_tgt_iterator(struct dfs_cache_tgt_list *tl)
58{
59 if (!tl)
60 return NULL;
61 return list_first_entry_or_null(&tl->tl_list,
62 struct dfs_cache_tgt_iterator,
63 it_list);
64}
65
66static inline void dfs_cache_free_tgts(struct dfs_cache_tgt_list *tl)
67{
68 struct dfs_cache_tgt_iterator *it, *nit;
69
70 if (!tl || list_empty(&tl->tl_list))
71 return;
72 list_for_each_entry_safe(it, nit, &tl->tl_list, it_list) {
73 list_del(&it->it_list);
74 kfree(it->it_name);
75 kfree(it);
76 }
77 tl->tl_numtgts = 0;
78}
79
80static inline const char *
81dfs_cache_get_tgt_name(const struct dfs_cache_tgt_iterator *it)
82{
83 return it ? it->it_name : NULL;
84}
85
86static inline int
87dfs_cache_get_nr_tgts(const struct dfs_cache_tgt_list *tl)
88{
89 return tl ? tl->tl_numtgts : 0;
90}
91
92#endif /* _CIFS_DFS_CACHE_H */