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bacd704a95
For the case where we have a DFS path like below and we're currently
connected to targetA:
//dfsroot/link -> //targetA/share/foo, //targetB/share/bar
after failover, we should make sure to update cifs_sb->prepath so the
next operations will use the new prefix path "/bar".
Besides, in order to simplify the use of different prefix paths,
enforce CIFS_MOUNT_USE_PREFIX_PATH for DFS mounts so we don't have to
revalidate the root dentry every time we set a new prefix path.
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
103 lines
2.8 KiB
C
103 lines
2.8 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 "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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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_add_vol(char *mntdata, struct smb_vol *vol,
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const char *fullpath);
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extern int dfs_cache_update_vol(const char *fullpath,
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struct TCP_Server_Info *server);
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extern void dfs_cache_del_vol(const char *fullpath);
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extern int dfs_cache_get_tgt_share(const struct dfs_cache_tgt_iterator *it,
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const char **share, size_t *share_len,
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const char **prefix, size_t *prefix_len);
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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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