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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Functions to handle the cached directory entries
*
* Copyright (c) 2022, Ronnie Sahlberg <lsahlber@redhat.com>
*/
#ifndef _CACHED_DIR_H
#define _CACHED_DIR_H
struct cached_dirent {
struct list_head entry;
char *name;
int namelen;
loff_t pos;
struct cifs_fattr fattr;
};
struct cached_dirents {
bool is_valid:1;
bool is_failed:1;
struct file *file; /*
* Used to associate the cache with a single
* open file instance.
*/
struct mutex de_mutex;
loff_t pos; /* Expected ctx->pos */
struct list_head entries;
/* accounting for cached entries in this directory */
unsigned long entries_count;
unsigned long bytes_used;
};
struct cached_fid {
struct list_head entry;
struct cached_fids *cfids;
const char *path;
bool has_lease;
bool is_open;
bool on_list;
bool file_all_info_is_valid;
unsigned long time; /* jiffies of when lease was taken */
unsigned long last_access_time; /* jiffies of when last accessed */
struct kref refcount;
struct cifs_fid fid;
struct cifs_tcon *tcon;
struct dentry *dentry;
struct work_struct put_work;
struct work_struct close_work;
struct smb2_file_all_info file_all_info;
struct cached_dirents dirents;
};
/* default MAX_CACHED_FIDS is 16 */
struct cached_fids {
/* Must be held when:
* - accessing the cfids->entries list
* - accessing the cfids->dying list
*/
spinlock_t cfid_list_lock;
int num_entries;
struct list_head entries;
struct list_head dying;
struct delayed_work laundromat_work;
/* aggregate accounting for all cached dirents under this tcon */
atomic_long_t total_dirents_entries;
atomic64_t total_dirents_bytes;
};
/* Module-wide directory cache accounting (defined in cifsfs.c) */
extern atomic64_t cifs_dircache_bytes_used; /* bytes across all mounts */
static inline bool
is_valid_cached_dir(struct cached_fid *cfid)
{
return cfid->time && cfid->has_lease;
}
extern struct cached_fids *init_cached_dirs(void);
extern void free_cached_dirs(struct cached_fids *cfids);
extern int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
const char *path,
struct cifs_sb_info *cifs_sb,
bool lookup_only, struct cached_fid **cfid);
extern int open_cached_dir_by_dentry(struct cifs_tcon *tcon,
struct dentry *dentry,
struct cached_fid **cfid);
extern void close_cached_dir(struct cached_fid *cfid);
extern void drop_cached_dir_by_name(const unsigned int xid,
struct cifs_tcon *tcon,
const char *name,
struct cifs_sb_info *cifs_sb);
extern void close_all_cached_dirs(struct cifs_sb_info *cifs_sb);
extern void invalidate_all_cached_dirs(struct cifs_tcon *tcon);
extern bool cached_dir_lease_break(struct cifs_tcon *tcon, __u8 lease_key[16]);
#endif /* _CACHED_DIR_H */
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