1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 *  Functions to handle the cached directory entries
 4 *
 5 *  Copyright (c) 2022, Ronnie Sahlberg <lsahlber@redhat.com>
 6 */
 7
 8#ifndef _CACHED_DIR_H
 9#define _CACHED_DIR_H
10
11
12struct cached_dirent {
13	struct list_head entry;
14	char *name;
15	int namelen;
16	loff_t pos;
17
18	struct cifs_fattr fattr;
19};
20
21struct cached_dirents {
22	bool is_valid:1;
23	bool is_failed:1;
24	struct dir_context *ctx; /*
25				  * Only used to make sure we only take entries
26				  * from a single context. Never dereferenced.
27				  */
28	struct mutex de_mutex;
29	int pos;		 /* Expected ctx->pos */
30	struct list_head entries;
31};
32
33struct cached_fid {
34	struct list_head entry;
35	struct cached_fids *cfids;
36	const char *path;
37	bool has_lease:1;
38	bool is_open:1;
39	bool on_list:1;
40	bool file_all_info_is_valid:1;
41	unsigned long time; /* jiffies of when lease was taken */
42	struct kref refcount;
43	struct cifs_fid fid;
44	spinlock_t fid_lock;
45	struct cifs_tcon *tcon;
46	struct dentry *dentry;
47	struct work_struct lease_break;
48	struct smb2_file_all_info file_all_info;
49	struct cached_dirents dirents;
50};
51
52#define MAX_CACHED_FIDS 16
53struct cached_fids {
54	/* Must be held when:
55	 * - accessing the cfids->entries list
56	 */
57	spinlock_t cfid_list_lock;
58	int num_entries;
59	struct list_head entries;
60};
61
62extern struct cached_fids *init_cached_dirs(void);
63extern void free_cached_dirs(struct cached_fids *cfids);
64extern int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
65			   const char *path,
66			   struct cifs_sb_info *cifs_sb,
67			   bool lookup_only, struct cached_fid **cfid);
68extern int open_cached_dir_by_dentry(struct cifs_tcon *tcon,
69				     struct dentry *dentry,
70				     struct cached_fid **cfid);
71extern void close_cached_dir(struct cached_fid *cfid);
72extern void drop_cached_dir_by_name(const unsigned int xid,
73				    struct cifs_tcon *tcon,
74				    const char *name,
75				    struct cifs_sb_info *cifs_sb);
76extern void close_all_cached_dirs(struct cifs_sb_info *cifs_sb);
77extern void invalidate_all_cached_dirs(struct cifs_tcon *tcon);
78extern int cached_dir_lease_break(struct cifs_tcon *tcon, __u8 lease_key[16]);
79
80#endif			/* _CACHED_DIR_H */