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
15 struct dfs_cache_tgt_list {
16 int tl_numtgts;
17 struct list_head tl_list;
18 };
19
20 struct dfs_cache_tgt_iterator {
21 char *it_name;
22 int it_path_consumed;
23 struct list_head it_list;
24 };
25
26 extern int dfs_cache_init(void);
27 extern void dfs_cache_destroy(void);
28 extern const struct proc_ops dfscache_proc_ops;
29
30 extern int dfs_cache_find(const unsigned int xid, struct cifs_ses *ses,
31 const struct nls_table *nls_codepage, int remap,
32 const char *path, struct dfs_info3_param *ref,
33 struct dfs_cache_tgt_list *tgt_list);
34 extern int dfs_cache_noreq_find(const char *path, struct dfs_info3_param *ref,
35 struct dfs_cache_tgt_list *tgt_list);
36 extern int dfs_cache_update_tgthint(const unsigned int xid,
37 struct cifs_ses *ses,
38 const struct nls_table *nls_codepage,
39 int remap, const char *path,
40 const struct dfs_cache_tgt_iterator *it);
41 extern int
42 dfs_cache_noreq_update_tgthint(const char *path,
43 const struct dfs_cache_tgt_iterator *it);
44 extern int dfs_cache_get_tgt_referral(const char *path,
45 const struct dfs_cache_tgt_iterator *it,
46 struct dfs_info3_param *ref);
47 extern int dfs_cache_add_vol(char *mntdata, struct smb_vol *vol,
48 const char *fullpath);
49 extern int dfs_cache_update_vol(const char *fullpath,
50 struct TCP_Server_Info *server);
51 extern void dfs_cache_del_vol(const char *fullpath);
52 extern int dfs_cache_get_tgt_share(char *path, const struct dfs_cache_tgt_iterator *it,
53 char **share, char **prefix);
54
55 static inline struct dfs_cache_tgt_iterator *
dfs_cache_get_next_tgt(struct dfs_cache_tgt_list * tl,struct dfs_cache_tgt_iterator * it)56 dfs_cache_get_next_tgt(struct dfs_cache_tgt_list *tl,
57 struct dfs_cache_tgt_iterator *it)
58 {
59 if (!tl || list_empty(&tl->tl_list) || !it ||
60 list_is_last(&it->it_list, &tl->tl_list))
61 return NULL;
62 return list_next_entry(it, it_list);
63 }
64
65 static inline struct dfs_cache_tgt_iterator *
dfs_cache_get_tgt_iterator(struct dfs_cache_tgt_list * tl)66 dfs_cache_get_tgt_iterator(struct dfs_cache_tgt_list *tl)
67 {
68 if (!tl)
69 return NULL;
70 return list_first_entry_or_null(&tl->tl_list,
71 struct dfs_cache_tgt_iterator,
72 it_list);
73 }
74
dfs_cache_free_tgts(struct dfs_cache_tgt_list * tl)75 static inline void dfs_cache_free_tgts(struct dfs_cache_tgt_list *tl)
76 {
77 struct dfs_cache_tgt_iterator *it, *nit;
78
79 if (!tl || list_empty(&tl->tl_list))
80 return;
81 list_for_each_entry_safe(it, nit, &tl->tl_list, it_list) {
82 list_del(&it->it_list);
83 kfree(it->it_name);
84 kfree(it);
85 }
86 tl->tl_numtgts = 0;
87 }
88
89 static inline const char *
dfs_cache_get_tgt_name(const struct dfs_cache_tgt_iterator * it)90 dfs_cache_get_tgt_name(const struct dfs_cache_tgt_iterator *it)
91 {
92 return it ? it->it_name : NULL;
93 }
94
95 static inline int
dfs_cache_get_nr_tgts(const struct dfs_cache_tgt_list * tl)96 dfs_cache_get_nr_tgts(const struct dfs_cache_tgt_list *tl)
97 {
98 return tl ? tl->tl_numtgts : 0;
99 }
100
101 #endif /* _CIFS_DFS_CACHE_H */
102