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 put_work; 48 struct work_struct close_work; 49 struct smb2_file_all_info file_all_info; 50 struct cached_dirents dirents; 51 }; 52 53 /* default MAX_CACHED_FIDS is 16 */ 54 struct cached_fids { 55 /* Must be held when: 56 * - accessing the cfids->entries list 57 * - accessing the cfids->dying list 58 */ 59 spinlock_t cfid_list_lock; 60 int num_entries; 61 struct list_head entries; 62 struct list_head dying; 63 struct work_struct invalidation_work; 64 struct delayed_work laundromat_work; 65 }; 66 67 extern struct cached_fids *init_cached_dirs(void); 68 extern void free_cached_dirs(struct cached_fids *cfids); 69 extern int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon, 70 const char *path, 71 struct cifs_sb_info *cifs_sb, 72 bool lookup_only, struct cached_fid **cfid); 73 extern int open_cached_dir_by_dentry(struct cifs_tcon *tcon, 74 struct dentry *dentry, 75 struct cached_fid **cfid); 76 extern void close_cached_dir(struct cached_fid *cfid); 77 extern void drop_cached_dir_by_name(const unsigned int xid, 78 struct cifs_tcon *tcon, 79 const char *name, 80 struct cifs_sb_info *cifs_sb); 81 extern void close_all_cached_dirs(struct cifs_sb_info *cifs_sb); 82 extern void invalidate_all_cached_dirs(struct cifs_tcon *tcon); 83 extern int cached_dir_lease_break(struct cifs_tcon *tcon, __u8 lease_key[16]); 84 85 #endif /* _CACHED_DIR_H */ 86