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b62366181a
When remouting a DFS share, force a new DFS referral of the path and
if the currently cached targets do not match any of the new targets or
there was no cached targets, then mark it for reconnect.
For example:
$ mount //dom/dfs/link /mnt -o username=foo,password=bar
$ ls /mnt
oldfile.txt
change target share of 'link' in server settings
$ mount /mnt -o remount,username=foo,password=bar
$ ls /mnt
newfile.txt
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
98 lines
2.9 KiB
C
98 lines
2.9 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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#define DFS_CACHE_TGT_LIST_INIT(var) { .tl_numtgts = 0, .tl_list = LIST_HEAD_INIT((var).tl_list), }
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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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int dfs_cache_init(void);
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void dfs_cache_destroy(void);
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extern const struct proc_ops dfscache_proc_ops;
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int dfs_cache_find(const unsigned int xid, struct cifs_ses *ses, const struct nls_table *cp,
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int remap, const char *path, struct dfs_info3_param *ref,
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struct dfs_cache_tgt_list *tgt_list);
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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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int dfs_cache_update_tgthint(const unsigned int xid, struct cifs_ses *ses,
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const struct nls_table *cp, int remap, const char *path,
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const struct dfs_cache_tgt_iterator *it);
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int dfs_cache_noreq_update_tgthint(const char *path, const struct dfs_cache_tgt_iterator *it);
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int dfs_cache_get_tgt_referral(const char *path, const struct dfs_cache_tgt_iterator *it,
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struct dfs_info3_param *ref);
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int dfs_cache_get_tgt_share(char *path, const struct dfs_cache_tgt_iterator *it, char **share,
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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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char *dfs_cache_canonical_path(const char *path, const struct nls_table *cp, int remap);
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int dfs_cache_remount_fs(struct cifs_sb_info *cifs_sb);
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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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