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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * DFS referral cache routines4 *5 * Copyright (c) 2018-2019 Paulo Alcantara <palcantara@suse.de>6 */7 8#ifndef _CIFS_DFS_CACHE_H9#define _CIFS_DFS_CACHE_H10 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 int95dfs_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