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
12 struct 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
21 struct 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
33 struct 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 /* default MAX_CACHED_FIDS is 16 */
53 struct 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 struct delayed_work laundromat_work;
61 };
62
63 extern struct cached_fids *init_cached_dirs(void);
64 extern void free_cached_dirs(struct cached_fids *cfids);
65 extern int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
66 const char *path,
67 struct cifs_sb_info *cifs_sb,
68 bool lookup_only, struct cached_fid **cfid);
69 extern int open_cached_dir_by_dentry(struct cifs_tcon *tcon,
70 struct dentry *dentry,
71 struct cached_fid **cfid);
72 extern void close_cached_dir(struct cached_fid *cfid);
73 extern void drop_cached_dir_by_name(const unsigned int xid,
74 struct cifs_tcon *tcon,
75 const char *name,
76 struct cifs_sb_info *cifs_sb);
77 extern void close_all_cached_dirs(struct cifs_sb_info *cifs_sb);
78 extern void invalidate_all_cached_dirs(struct cifs_tcon *tcon);
79 extern int cached_dir_lease_break(struct cifs_tcon *tcon, __u8 lease_key[16]);
80
81 #endif /* _CACHED_DIR_H */
82
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