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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);
43void dfs_cache_put_refsrv_sessions(const uuid_t *mount_id);
44void dfs_cache_add_refsrv_session(const uuid_t *mount_id, struct cifs_ses *ses);
45char *dfs_cache_canonical_path(const char *path, const struct nls_table *cp, int remap);
46int dfs_cache_remount_fs(struct cifs_sb_info *cifs_sb);
47
48static inline struct dfs_cache_tgt_iterator *
49dfs_cache_get_next_tgt(struct dfs_cache_tgt_list *tl,
50 struct dfs_cache_tgt_iterator *it)
51{
52 if (!tl || list_empty(&tl->tl_list) || !it ||
53 list_is_last(&it->it_list, &tl->tl_list))
54 return NULL;
55 return list_next_entry(it, it_list);
56}
57
58static inline struct dfs_cache_tgt_iterator *
59dfs_cache_get_tgt_iterator(struct dfs_cache_tgt_list *tl)
60{
61 if (!tl)
62 return NULL;
63 return list_first_entry_or_null(&tl->tl_list,
64 struct dfs_cache_tgt_iterator,
65 it_list);
66}
67
68static inline void dfs_cache_free_tgts(struct dfs_cache_tgt_list *tl)
69{
70 struct dfs_cache_tgt_iterator *it, *nit;
71
72 if (!tl || list_empty(&tl->tl_list))
73 return;
74 list_for_each_entry_safe(it, nit, &tl->tl_list, it_list) {
75 list_del(&it->it_list);
76 kfree(it->it_name);
77 kfree(it);
78 }
79 tl->tl_numtgts = 0;
80}
81
82static inline const char *
83dfs_cache_get_tgt_name(const struct dfs_cache_tgt_iterator *it)
84{
85 return it ? it->it_name : NULL;
86}
87
88static inline int
89dfs_cache_get_nr_tgts(const struct dfs_cache_tgt_list *tl)
90{
91 return tl ? tl->tl_numtgts : 0;
92}
93
94#endif /* _CIFS_DFS_CACHE_H */