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 task_struct *laundromat; 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