1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Copyright (C) 2019 Samsung Electronics Co., Ltd.
4 */
5
6 #ifndef __VFS_CACHE_H__
7 #define __VFS_CACHE_H__
8
9 #include <linux/file.h>
10 #include <linux/fs.h>
11 #include <linux/rwsem.h>
12 #include <linux/spinlock.h>
13 #include <linux/idr.h>
14 #include <linux/workqueue.h>
15
16 #include "vfs.h"
17
18 /* Windows style file permissions for extended response */
19 #define FILE_GENERIC_ALL 0x1F01FF
20 #define FILE_GENERIC_READ 0x120089
21 #define FILE_GENERIC_WRITE 0x120116
22 #define FILE_GENERIC_EXECUTE 0X1200a0
23
24 #define KSMBD_START_FID 0
25 #define KSMBD_NO_FID (INT_MAX)
26 #define SMB2_NO_FID (0xFFFFFFFFFFFFFFFFULL)
27
28 struct ksmbd_conn;
29 struct ksmbd_session;
30
31 struct ksmbd_lock {
32 struct file_lock *fl;
33 struct list_head clist;
34 struct list_head flist;
35 struct list_head llist;
36 unsigned int flags;
37 int cmd;
38 int zero_len;
39 unsigned long long start;
40 unsigned long long end;
41 };
42
43 struct stream {
44 char *name;
45 ssize_t size;
46 };
47
48 struct ksmbd_inode {
49 rwlock_t m_lock;
50 atomic_t m_count;
51 atomic_t op_count;
52 /* opinfo count for streams */
53 atomic_t sop_count;
54 struct inode *m_inode;
55 unsigned int m_flags;
56 struct hlist_node m_hash;
57 struct list_head m_fp_list;
58 struct list_head m_op_list;
59 struct oplock_info *m_opinfo;
60 __le32 m_fattr;
61 };
62
63 enum {
64 FP_NEW = 0,
65 FP_INITED,
66 FP_CLOSED
67 };
68
69 struct ksmbd_file {
70 struct file *filp;
71 u64 persistent_id;
72 u64 volatile_id;
73
74 spinlock_t f_lock;
75
76 struct ksmbd_inode *f_ci;
77 struct ksmbd_inode *f_parent_ci;
78 struct oplock_info __rcu *f_opinfo;
79 struct ksmbd_conn *conn;
80 struct ksmbd_tree_connect *tcon;
81
82 atomic_t refcount;
83 __le32 daccess;
84 __le32 saccess;
85 __le32 coption;
86 __le32 cdoption;
87 __u64 create_time;
88 __u64 itime;
89
90 bool is_nt_open;
91 bool attrib_only;
92
93 char client_guid[16];
94 char create_guid[16];
95 char app_instance_id[16];
96
97 struct stream stream;
98 struct list_head node;
99 struct list_head blocked_works;
100 struct list_head lock_list;
101
102 int durable_timeout;
103
104 /* if ls is happening on directory, below is valid*/
105 struct ksmbd_readdir_data readdir_data;
106 int dot_dotdot[2];
107 unsigned int f_state;
108 };
109
set_ctx_actor(struct dir_context * ctx,filldir_t actor)110 static inline void set_ctx_actor(struct dir_context *ctx,
111 filldir_t actor)
112 {
113 ctx->actor = actor;
114 }
115
116 #define KSMBD_NR_OPEN_DEFAULT BITS_PER_LONG
117
118 struct ksmbd_file_table {
119 rwlock_t lock;
120 struct idr *idr;
121 };
122
has_file_id(u64 id)123 static inline bool has_file_id(u64 id)
124 {
125 return id < KSMBD_NO_FID;
126 }
127
ksmbd_stream_fd(struct ksmbd_file * fp)128 static inline bool ksmbd_stream_fd(struct ksmbd_file *fp)
129 {
130 return fp->stream.name != NULL;
131 }
132
133 int ksmbd_init_file_table(struct ksmbd_file_table *ft);
134 void ksmbd_destroy_file_table(struct ksmbd_file_table *ft);
135 int ksmbd_close_fd(struct ksmbd_work *work, u64 id);
136 struct ksmbd_file *ksmbd_lookup_fd_fast(struct ksmbd_work *work, u64 id);
137 struct ksmbd_file *ksmbd_lookup_foreign_fd(struct ksmbd_work *work, u64 id);
138 struct ksmbd_file *ksmbd_lookup_fd_slow(struct ksmbd_work *work, u64 id,
139 u64 pid);
140 void ksmbd_fd_put(struct ksmbd_work *work, struct ksmbd_file *fp);
141 struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id);
142 struct ksmbd_file *ksmbd_lookup_fd_cguid(char *cguid);
143 struct ksmbd_file *ksmbd_lookup_fd_inode(struct inode *inode);
144 unsigned int ksmbd_open_durable_fd(struct ksmbd_file *fp);
145 struct ksmbd_file *ksmbd_open_fd(struct ksmbd_work *work, struct file *filp);
146 void ksmbd_close_tree_conn_fds(struct ksmbd_work *work);
147 void ksmbd_close_session_fds(struct ksmbd_work *work);
148 int ksmbd_close_inode_fds(struct ksmbd_work *work, struct inode *inode);
149 int ksmbd_init_global_file_table(void);
150 void ksmbd_free_global_file_table(void);
151 void ksmbd_set_fd_limit(unsigned long limit);
152 void ksmbd_update_fstate(struct ksmbd_file_table *ft, struct ksmbd_file *fp,
153 unsigned int state);
154
155 /*
156 * INODE hash
157 */
158 int __init ksmbd_inode_hash_init(void);
159 void ksmbd_release_inode_hash(void);
160
161 enum KSMBD_INODE_STATUS {
162 KSMBD_INODE_STATUS_OK,
163 KSMBD_INODE_STATUS_UNKNOWN,
164 KSMBD_INODE_STATUS_PENDING_DELETE,
165 };
166
167 int ksmbd_query_inode_status(struct inode *inode);
168 bool ksmbd_inode_pending_delete(struct ksmbd_file *fp);
169 void ksmbd_set_inode_pending_delete(struct ksmbd_file *fp);
170 void ksmbd_clear_inode_pending_delete(struct ksmbd_file *fp);
171 void ksmbd_fd_set_delete_on_close(struct ksmbd_file *fp,
172 int file_info);
173 int ksmbd_init_file_cache(void);
174 void ksmbd_exit_file_cache(void);
175 #endif /* __VFS_CACHE_H__ */
176
