smb: move client and server files to common directory fs/smb
[sfrench/cifs-2.6.git] / fs / smb / client / dfs.h
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
13 struct dfs_root_ses {
14         struct list_head list;
15         struct cifs_ses *ses;
16 };
17
18 int dfs_parse_target_referral(const char *full_path, const struct dfs_info3_param *ref,
19                               struct smb3_fs_context *ctx);
20 int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs);
21
22 static inline char *dfs_get_path(struct cifs_sb_info *cifs_sb, const char *path)
23 {
24         return dfs_cache_canonical_path(path, cifs_sb->local_nls, cifs_remap(cifs_sb));
25 }
26
27 static inline int dfs_get_referral(struct cifs_mount_ctx *mnt_ctx, const char *path,
28                                    struct dfs_info3_param *ref, struct dfs_cache_tgt_list *tl)
29 {
30         struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
31         struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
32
33         return dfs_cache_find(mnt_ctx->xid, ctx->dfs_root_ses, cifs_sb->local_nls,
34                               cifs_remap(cifs_sb), path, ref, tl);
35 }
36
37 /* Return DFS full path out of a dentry set for automount */
38 static inline char *dfs_get_automount_devname(struct dentry *dentry, void *page)
39 {
40         struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
41         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
42         struct TCP_Server_Info *server = tcon->ses->server;
43         size_t len;
44         char *s;
45
46         spin_lock(&server->srv_lock);
47         if (unlikely(!server->origin_fullpath)) {
48                 spin_unlock(&server->srv_lock);
49                 return ERR_PTR(-EREMOTE);
50         }
51         spin_unlock(&server->srv_lock);
52
53         s = dentry_path_raw(dentry, page, PATH_MAX);
54         if (IS_ERR(s))
55                 return s;
56         /* for root, we want "" */
57         if (!s[1])
58                 s++;
59
60         spin_lock(&server->srv_lock);
61         len = strlen(server->origin_fullpath);
62         if (s < (char *)page + len) {
63                 spin_unlock(&server->srv_lock);
64                 return ERR_PTR(-ENAMETOOLONG);
65         }
66
67         s -= len;
68         memcpy(s, server->origin_fullpath, len);
69         spin_unlock(&server->srv_lock);
70         convert_delimiter(s, '/');
71
72         return s;
73 }
74
75 static inline void dfs_put_root_smb_sessions(struct list_head *head)
76 {
77         struct dfs_root_ses *root, *tmp;
78
79         list_for_each_entry_safe(root, tmp, head, list) {
80                 list_del_init(&root->list);
81                 cifs_put_smb_ses(root->ses);
82                 kfree(root);
83         }
84 }
85
86 #endif /* _CIFS_DFS_H */