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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2022 Paulo Alcantara <palcantara@suse.de>
*/
#ifndef _CIFS_DFS_H
#define _CIFS_DFS_H
#include "cifsglob.h"
#include "cifsproto.h"
#include "fs_context.h"
#include "dfs_cache.h"
#include "cifs_unicode.h"
#include <linux/namei.h>
#define DFS_INTERLINK(v) \
(((v) & DFSREF_REFERRAL_SERVER) && !((v) & DFSREF_STORAGE_SERVER))
struct dfs_ref {
char *path;
char *full_path;
struct dfs_cache_tgt_list tl;
struct dfs_cache_tgt_iterator *tit;
};
struct dfs_ref_walk {
struct dfs_ref *ref;
struct dfs_ref refs[MAX_NESTED_LINKS];
};
#define ref_walk_start(w) ((w)->refs)
#define ref_walk_end(w) (&(w)->refs[ARRAY_SIZE((w)->refs) - 1])
#define ref_walk_cur(w) ((w)->ref)
#define ref_walk_descend(w) (--ref_walk_cur(w) >= ref_walk_start(w))
#define ref_walk_tit(w) (ref_walk_cur(w)->tit)
#define ref_walk_empty(w) (!ref_walk_tit(w))
#define ref_walk_path(w) (ref_walk_cur(w)->path)
#define ref_walk_fpath(w) (ref_walk_cur(w)->full_path)
#define ref_walk_tl(w) (&ref_walk_cur(w)->tl)
static inline struct dfs_ref_walk *ref_walk_alloc(void)
{
struct dfs_ref_walk *rw;
rw = kmalloc(sizeof(*rw), GFP_KERNEL);
if (!rw)
return ERR_PTR(-ENOMEM);
return rw;
}
static inline void ref_walk_init(struct dfs_ref_walk *rw)
{
memset(rw, 0, sizeof(*rw));
ref_walk_cur(rw) = ref_walk_start(rw);
}
static inline void __ref_walk_free(struct dfs_ref *ref)
{
kfree(ref->path);
kfree(ref->full_path);
dfs_cache_free_tgts(&ref->tl);
memset(ref, 0, sizeof(*ref));
}
static inline void ref_walk_free(struct dfs_ref_walk *rw)
{
struct dfs_ref *ref = ref_walk_start(rw);
for (; ref <= ref_walk_end(rw); ref++)
__ref_walk_free(ref);
kfree(rw);
}
static inline int ref_walk_advance(struct dfs_ref_walk *rw)
{
struct dfs_ref *ref = ref_walk_cur(rw) + 1;
if (ref > ref_walk_end(rw))
return -ELOOP;
__ref_walk_free(ref);
ref_walk_cur(rw) = ref;
return 0;
}
static inline struct dfs_cache_tgt_iterator *
ref_walk_next_tgt(struct dfs_ref_walk *rw)
{
struct dfs_cache_tgt_iterator *tit;
struct dfs_ref *ref = ref_walk_cur(rw);
if (!ref->tit)
tit = dfs_cache_get_tgt_iterator(&ref->tl);
else
tit = dfs_cache_get_next_tgt(&ref->tl, ref->tit);
ref->tit = tit;
return tit;
}
static inline int ref_walk_get_tgt(struct dfs_ref_walk *rw,
struct dfs_info3_param *tgt)
{
zfree_dfs_info_param(tgt);
return dfs_cache_get_tgt_referral(ref_walk_path(rw) + 1,
ref_walk_tit(rw), tgt);
}
static inline int ref_walk_num_tgts(struct dfs_ref_walk *rw)
{
return dfs_cache_get_nr_tgts(ref_walk_tl(rw));
}
static inline void ref_walk_set_tgt_hint(struct dfs_ref_walk *rw)
{
dfs_cache_noreq_update_tgthint(ref_walk_path(rw) + 1,
ref_walk_tit(rw));
}
int dfs_parse_target_referral(const char *full_path, const struct dfs_info3_param *ref,
struct smb3_fs_context *ctx);
int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs);
static inline char *dfs_get_path(struct cifs_sb_info *cifs_sb, const char *path)
{
return dfs_cache_canonical_path(path, cifs_sb->local_nls, cifs_remap(cifs_sb));
}
static inline int dfs_get_referral(struct cifs_mount_ctx *mnt_ctx, const char *path,
struct dfs_info3_param *ref, struct dfs_cache_tgt_list *tl)
{
struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
struct cifs_ses *rses = ctx->dfs_root_ses ?: mnt_ctx->ses;
return dfs_cache_find(mnt_ctx->xid, rses, cifs_sb->local_nls,
cifs_remap(cifs_sb), path, ref, tl);
}
/*
* cifs_get_smb_ses() already guarantees an active reference of
* @ses->dfs_root_ses when a new session is created, so we need to put extra
* references of all DFS root sessions that were used across the mount process
* in dfs_mount_share().
*/
static inline void dfs_put_root_smb_sessions(struct cifs_mount_ctx *mnt_ctx)
{
const struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
struct cifs_ses *ses = ctx->dfs_root_ses;
struct cifs_ses *cur;
if (!ses)
return;
for (cur = ses; cur; cur = cur->dfs_root_ses) {
if (cur->dfs_root_ses)
cifs_put_smb_ses(cur->dfs_root_ses);
}
cifs_put_smb_ses(ses);
}
#endif /* _CIFS_DFS_H */
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