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 */ 87