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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
16extern struct workqueue_struct *dfscache_wq;
17extern atomic_t dfs_cache_ttl;
18
19#define DFS_CACHE_TGT_LIST_INIT(var) { .tl_numtgts = 0, .tl_list = LIST_HEAD_INIT((var).tl_list), }
20
21struct dfs_cache_tgt_list {
22 int tl_numtgts;
23 struct list_head tl_list;
24};
25
26struct dfs_cache_tgt_iterator {
27 char *it_name;
28 int it_path_consumed;
29 struct list_head it_list;
30};
31
32int dfs_cache_init(void);
33void dfs_cache_destroy(void);
34extern const struct proc_ops dfscache_proc_ops;
35
36int dfs_cache_find(const unsigned int xid, struct cifs_ses *ses, const struct nls_table *cp,
37 int remap, const char *path, struct dfs_info3_param *ref,
38 struct dfs_cache_tgt_list *tgt_list);
39int dfs_cache_noreq_find(const char *path, struct dfs_info3_param *ref,
40 struct dfs_cache_tgt_list *tgt_list);
41void dfs_cache_noreq_update_tgthint(const char *path, const struct dfs_cache_tgt_iterator *it);
42int dfs_cache_get_tgt_referral(const char *path, const struct dfs_cache_tgt_iterator *it,
43 struct dfs_info3_param *ref);
44int dfs_cache_get_tgt_share(char *path, const struct dfs_cache_tgt_iterator *it, char **share,
45 char **prefix);
46char *dfs_cache_canonical_path(const char *path, const struct nls_table *cp, int remap);
47int dfs_cache_remount_fs(struct cifs_sb_info *cifs_sb);
48void dfs_cache_refresh(struct work_struct *work);
49
50static inline struct dfs_cache_tgt_iterator *
51dfs_cache_get_next_tgt(struct dfs_cache_tgt_list *tl,
52 struct dfs_cache_tgt_iterator *it)
53{
54 if (!tl || list_empty(&tl->tl_list) || !it ||
55 list_is_last(&it->it_list, &tl->tl_list))
56 return NULL;
57 return list_next_entry(it, it_list);
58}
59
60static inline struct dfs_cache_tgt_iterator *
61dfs_cache_get_tgt_iterator(struct dfs_cache_tgt_list *tl)
62{
63 if (!tl)
64 return NULL;
65 return list_first_entry_or_null(&tl->tl_list,
66 struct dfs_cache_tgt_iterator,
67 it_list);
68}
69
70static inline void dfs_cache_free_tgts(struct dfs_cache_tgt_list *tl)
71{
72 struct dfs_cache_tgt_iterator *it, *nit;
73
74 if (!tl || list_empty(&tl->tl_list))
75 return;
76 list_for_each_entry_safe(it, nit, &tl->tl_list, it_list) {
77 list_del(&it->it_list);
78 kfree(it->it_name);
79 kfree(it);
80 }
81 tl->tl_numtgts = 0;
82}
83
84static inline const char *
85dfs_cache_get_tgt_name(const struct dfs_cache_tgt_iterator *it)
86{
87 return it ? it->it_name : NULL;
88}
89
90static inline int
91dfs_cache_get_nr_tgts(const struct dfs_cache_tgt_list *tl)
92{
93 return tl ? tl->tl_numtgts : 0;
94}
95
96static inline int dfs_cache_get_ttl(void)
97{
98 return atomic_read(&dfs_cache_ttl);
99}
100
101#endif /* _CIFS_DFS_CACHE_H */