c9f7110399
At every mount, keep all sessions alive that were used for chasing the DFS referrals as long as the dfs mounts are active. Use those sessions in DFS cache to refresh all active tcons as well as cached entries. They will be managed by a list of mount_group structures that will be indexed by a randomly generated uuid at mount time, so we can put all the sessions related to specific dfs mounts and avoid leaking them. Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com>
100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* DFS referral cache routines
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*
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* Copyright (c) 2018-2019 Paulo Alcantara <palcantara@suse.de>
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*/
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#ifndef _CIFS_DFS_CACHE_H
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#define _CIFS_DFS_CACHE_H
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#include <linux/nls.h>
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#include <linux/list.h>
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#include <linux/uuid.h>
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#include "cifsglob.h"
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struct dfs_cache_tgt_list {
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int tl_numtgts;
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struct list_head tl_list;
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};
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struct dfs_cache_tgt_iterator {
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char *it_name;
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int it_path_consumed;
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struct list_head it_list;
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};
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extern int dfs_cache_init(void);
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extern void dfs_cache_destroy(void);
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extern const struct proc_ops dfscache_proc_ops;
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extern int dfs_cache_find(const unsigned int xid, struct cifs_ses *ses,
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const struct nls_table *nls_codepage, int remap,
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const char *path, struct dfs_info3_param *ref,
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struct dfs_cache_tgt_list *tgt_list);
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extern int dfs_cache_noreq_find(const char *path, struct dfs_info3_param *ref,
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struct dfs_cache_tgt_list *tgt_list);
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extern int dfs_cache_update_tgthint(const unsigned int xid,
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struct cifs_ses *ses,
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const struct nls_table *nls_codepage,
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int remap, const char *path,
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const struct dfs_cache_tgt_iterator *it);
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extern int
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dfs_cache_noreq_update_tgthint(const char *path,
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const struct dfs_cache_tgt_iterator *it);
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extern int dfs_cache_get_tgt_referral(const char *path,
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const struct dfs_cache_tgt_iterator *it,
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struct dfs_info3_param *ref);
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extern int dfs_cache_get_tgt_share(char *path, const struct dfs_cache_tgt_iterator *it,
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char **share, char **prefix);
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void dfs_cache_put_refsrv_sessions(const uuid_t *mount_id);
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void dfs_cache_add_refsrv_session(const uuid_t *mount_id, struct cifs_ses *ses);
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static inline struct dfs_cache_tgt_iterator *
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dfs_cache_get_next_tgt(struct dfs_cache_tgt_list *tl,
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struct dfs_cache_tgt_iterator *it)
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{
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if (!tl || list_empty(&tl->tl_list) || !it ||
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list_is_last(&it->it_list, &tl->tl_list))
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return NULL;
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return list_next_entry(it, it_list);
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}
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static inline struct dfs_cache_tgt_iterator *
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dfs_cache_get_tgt_iterator(struct dfs_cache_tgt_list *tl)
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{
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if (!tl)
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return NULL;
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return list_first_entry_or_null(&tl->tl_list,
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struct dfs_cache_tgt_iterator,
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it_list);
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}
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static inline void dfs_cache_free_tgts(struct dfs_cache_tgt_list *tl)
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{
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struct dfs_cache_tgt_iterator *it, *nit;
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if (!tl || list_empty(&tl->tl_list))
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return;
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list_for_each_entry_safe(it, nit, &tl->tl_list, it_list) {
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list_del(&it->it_list);
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kfree(it->it_name);
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kfree(it);
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}
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tl->tl_numtgts = 0;
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}
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static inline const char *
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dfs_cache_get_tgt_name(const struct dfs_cache_tgt_iterator *it)
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{
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return it ? it->it_name : NULL;
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}
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static inline int
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dfs_cache_get_nr_tgts(const struct dfs_cache_tgt_list *tl)
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{
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return tl ? tl->tl_numtgts : 0;
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}
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#endif /* _CIFS_DFS_CACHE_H */
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