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 16extern struct workqueue_struct *dfscache_wq; 17extern 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 25struct dfs_cache_tgt_list { 26 int tl_numtgts; 27 struct list_head tl_list; 28}; 29 30struct dfs_cache_tgt_iterator { 31 char *it_name; 32 int it_path_consumed; 33 struct list_head it_list; 34}; 35 36int dfs_cache_init(void); 37void dfs_cache_destroy(void); 38extern const struct proc_ops dfscache_proc_ops; 39 40int 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); 43int dfs_cache_noreq_find(const char *path, struct dfs_info3_param *ref, 44 struct dfs_cache_tgt_list *tgt_list); 45void dfs_cache_noreq_update_tgthint(const char *path, const struct dfs_cache_tgt_iterator *it); 46int dfs_cache_get_tgt_referral(const char *path, const struct dfs_cache_tgt_iterator *it, 47 struct dfs_info3_param *ref); 48int dfs_cache_get_tgt_share(char *path, const struct dfs_cache_tgt_iterator *it, char **share, 49 char **prefix); 50char *dfs_cache_canonical_path(const char *path, const struct nls_table *cp, int remap); 51int dfs_cache_remount_fs(struct cifs_sb_info *cifs_sb); 52void dfs_cache_refresh(struct work_struct *work); 53 54static inline struct dfs_cache_tgt_iterator * 55dfs_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 64static inline struct dfs_cache_tgt_iterator * 65dfs_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 74static 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 88static inline const char * 89dfs_cache_get_tgt_name(const struct dfs_cache_tgt_iterator *it) 90{ 91 return it ? it->it_name : NULL; 92} 93 94static inline int 95dfs_cache_get_nr_tgts(const struct dfs_cache_tgt_list *tl) 96{ 97 return tl ? tl->tl_numtgts : 0; 98} 99 100static inline int dfs_cache_get_ttl(void) 101{ 102 return atomic_read(&dfs_cache_ttl); 103} 104 105#endif /* _CIFS_DFS_CACHE_H */ 106