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