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 <linux/uuid.h> 14 #include "cifsglob.h" 15 16 extern struct workqueue_struct *dfscache_wq; 17 extern atomic_t dfs_cache_ttl; 18 19 #define DFS_CACHE_TGT_LIST_INIT(var) \ 20 { .tl_numtgts = 0, .tl_list = LIST_HEAD_INIT((var).tl_list), } 21 22 #define DFS_CACHE_TGT_LIST(var) \ 23 struct dfs_cache_tgt_list var = DFS_CACHE_TGT_LIST_INIT(var) 24 25 struct dfs_cache_tgt_list { 26 int tl_numtgts; 27 struct list_head tl_list; 28 }; 29 30 struct dfs_cache_tgt_iterator { 31 char *it_name; 32 int it_path_consumed; 33 struct list_head it_list; 34 }; 35 36 int dfs_cache_init(void); 37 void dfs_cache_destroy(void); 38 extern const struct proc_ops dfscache_proc_ops; 39 40 int dfs_cache_find(const unsigned int xid, struct cifs_ses *ses, const struct nls_table *cp, 41 int remap, const char *path, struct dfs_info3_param *ref, 42 struct dfs_cache_tgt_list *tgt_list); 43 int dfs_cache_noreq_find(const char *path, struct dfs_info3_param *ref, 44 struct dfs_cache_tgt_list *tgt_list); 45 void dfs_cache_noreq_update_tgthint(const char *path, const struct dfs_cache_tgt_iterator *it); 46 int dfs_cache_get_tgt_referral(const char *path, const struct dfs_cache_tgt_iterator *it, 47 struct dfs_info3_param *ref); 48 int dfs_cache_get_tgt_share(char *path, const struct dfs_cache_tgt_iterator *it, char **share, 49 char **prefix); 50 char *dfs_cache_canonical_path(const char *path, const struct nls_table *cp, int remap); 51 int dfs_cache_remount_fs(struct cifs_sb_info *cifs_sb); 52 void dfs_cache_refresh(struct work_struct *work); 53 54 static inline struct dfs_cache_tgt_iterator * 55 dfs_cache_get_next_tgt(struct dfs_cache_tgt_list *tl, 56 struct dfs_cache_tgt_iterator *it) 57 { 58 if (!tl || !tl->tl_numtgts || list_empty(&tl->tl_list) || 59 !it || list_is_last(&it->it_list, &tl->tl_list)) 60 return NULL; 61 return list_next_entry(it, it_list); 62 } 63 64 static inline struct dfs_cache_tgt_iterator * 65 dfs_cache_get_tgt_iterator(struct dfs_cache_tgt_list *tl) 66 { 67 if (!tl) 68 return NULL; 69 return list_first_entry_or_null(&tl->tl_list, 70 struct dfs_cache_tgt_iterator, 71 it_list); 72 } 73 74 static inline void dfs_cache_free_tgts(struct dfs_cache_tgt_list *tl) 75 { 76 struct dfs_cache_tgt_iterator *it, *nit; 77 78 if (!tl || !tl->tl_numtgts || list_empty(&tl->tl_list)) 79 return; 80 list_for_each_entry_safe(it, nit, &tl->tl_list, it_list) { 81 list_del(&it->it_list); 82 kfree(it->it_name); 83 kfree(it); 84 } 85 tl->tl_numtgts = 0; 86 } 87 88 static inline const char * 89 dfs_cache_get_tgt_name(const struct dfs_cache_tgt_iterator *it) 90 { 91 return it ? it->it_name : NULL; 92 } 93 94 static inline int 95 dfs_cache_get_nr_tgts(const struct dfs_cache_tgt_list *tl) 96 { 97 return tl ? tl->tl_numtgts : 0; 98 } 99 100 static inline int dfs_cache_get_ttl(void) 101 { 102 return atomic_read(&dfs_cache_ttl); 103 } 104 105 #endif /* _CIFS_DFS_CACHE_H */ 106