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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (c) 2022 Paulo Alcantara <palcantara@suse.de>
4 */
5
6#ifndef _CIFS_DFS_H
7#define _CIFS_DFS_H
8
9#include "cifsglob.h"
10#include "fs_context.h"
11#include "cifs_unicode.h"
12#include <linux/namei.h>
13
14#define DFS_INTERLINK(v) \
15 (((v) & DFSREF_REFERRAL_SERVER) && !((v) & DFSREF_STORAGE_SERVER))
16
17struct dfs_ref {
18 char *path;
19 char *full_path;
20 struct dfs_cache_tgt_list tl;
21 struct dfs_cache_tgt_iterator *tit;
22};
23
24struct dfs_ref_walk {
25 struct dfs_ref *ref;
26 struct dfs_ref refs[MAX_NESTED_LINKS];
27};
28
29#define ref_walk_start(w) ((w)->refs)
30#define ref_walk_end(w) (&(w)->refs[ARRAY_SIZE((w)->refs) - 1])
31#define ref_walk_cur(w) ((w)->ref)
32#define ref_walk_descend(w) (--ref_walk_cur(w) >= ref_walk_start(w))
33
34#define ref_walk_tit(w) (ref_walk_cur(w)->tit)
35#define ref_walk_empty(w) (!ref_walk_tit(w))
36#define ref_walk_path(w) (ref_walk_cur(w)->path)
37#define ref_walk_fpath(w) (ref_walk_cur(w)->full_path)
38#define ref_walk_tl(w) (&ref_walk_cur(w)->tl)
39
40static inline struct dfs_ref_walk *ref_walk_alloc(void)
41{
42 struct dfs_ref_walk *rw;
43
44 rw = kmalloc(sizeof(*rw), GFP_KERNEL);
45 if (!rw)
46 return ERR_PTR(-ENOMEM);
47 return rw;
48}
49
50static inline void ref_walk_init(struct dfs_ref_walk *rw)
51{
52 memset(rw, 0, sizeof(*rw));
53 ref_walk_cur(rw) = ref_walk_start(rw);
54}
55
56static inline void __ref_walk_free(struct dfs_ref *ref)
57{
58 kfree(ref->path);
59 kfree(ref->full_path);
60 dfs_cache_free_tgts(&ref->tl);
61 memset(ref, 0, sizeof(*ref));
62}
63
64static inline void ref_walk_free(struct dfs_ref_walk *rw)
65{
66 struct dfs_ref *ref = ref_walk_start(rw);
67
68 for (; ref <= ref_walk_end(rw); ref++)
69 __ref_walk_free(ref);
70 kfree(rw);
71}
72
73static inline int ref_walk_advance(struct dfs_ref_walk *rw)
74{
75 struct dfs_ref *ref = ref_walk_cur(rw) + 1;
76
77 if (ref > ref_walk_end(rw))
78 return -ELOOP;
79 __ref_walk_free(ref);
80 ref_walk_cur(rw) = ref;
81 return 0;
82}
83
84static inline struct dfs_cache_tgt_iterator *
85ref_walk_next_tgt(struct dfs_ref_walk *rw)
86{
87 struct dfs_cache_tgt_iterator *tit;
88 struct dfs_ref *ref = ref_walk_cur(rw);
89
90 if (!ref->tit)
91 tit = dfs_cache_get_tgt_iterator(&ref->tl);
92 else
93 tit = dfs_cache_get_next_tgt(&ref->tl, ref->tit);
94 ref->tit = tit;
95 return tit;
96}
97
98static inline int ref_walk_get_tgt(struct dfs_ref_walk *rw,
99 struct dfs_info3_param *tgt)
100{
101 zfree_dfs_info_param(tgt);
102 return dfs_cache_get_tgt_referral(ref_walk_path(rw) + 1,
103 ref_walk_tit(rw), tgt);
104}
105
106static inline int ref_walk_num_tgts(struct dfs_ref_walk *rw)
107{
108 return dfs_cache_get_nr_tgts(ref_walk_tl(rw));
109}
110
111static inline void ref_walk_set_tgt_hint(struct dfs_ref_walk *rw)
112{
113 dfs_cache_noreq_update_tgthint(ref_walk_path(rw) + 1,
114 ref_walk_tit(rw));
115}
116
117struct dfs_root_ses {
118 struct list_head list;
119 struct cifs_ses *ses;
120};
121
122int dfs_parse_target_referral(const char *full_path, const struct dfs_info3_param *ref,
123 struct smb3_fs_context *ctx);
124int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs);
125
126static inline char *dfs_get_path(struct cifs_sb_info *cifs_sb, const char *path)
127{
128 return dfs_cache_canonical_path(path, cifs_sb->local_nls, cifs_remap(cifs_sb));
129}
130
131static inline int dfs_get_referral(struct cifs_mount_ctx *mnt_ctx, const char *path,
132 struct dfs_info3_param *ref, struct dfs_cache_tgt_list *tl)
133{
134 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
135 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
136
137 return dfs_cache_find(mnt_ctx->xid, ctx->dfs_root_ses, cifs_sb->local_nls,
138 cifs_remap(cifs_sb), path, ref, tl);
139}
140
141static inline void dfs_put_root_smb_sessions(struct list_head *head)
142{
143 struct dfs_root_ses *root, *tmp;
144
145 list_for_each_entry_safe(root, tmp, head, list) {
146 list_del_init(&root->list);
147 cifs_put_smb_ses(root->ses);
148 kfree(root);
149 }
150}
151
152#endif /* _CIFS_DFS_H */