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 #include "mgmt/share_config.h"
18
19 /* Windows style file permissions for extended response */
20 #define FILE_GENERIC_ALL 0x1F01FF
21 #define FILE_GENERIC_READ 0x120089
22 #define FILE_GENERIC_WRITE 0x120116
23 #define FILE_GENERIC_EXECUTE 0X1200a0
24
25 #define KSMBD_START_FID 0
26 #define KSMBD_NO_FID (INT_MAX)
27 #define SMB2_NO_FID (0xFFFFFFFFFFFFFFFFULL)
28
29 struct ksmbd_conn;
30 struct ksmbd_session;
31
32 struct ksmbd_lock {
33 struct file_lock *fl;
34 struct list_head clist;
35 struct list_head flist;
36 struct list_head llist;
37 unsigned int flags;
38 int cmd;
39 int zero_len;
40 unsigned long long start;
41 unsigned long long end;
42 };
43
44 struct stream {
45 char *name;
46 ssize_t size;
47 };
48
49 struct ksmbd_inode {
50 struct rw_semaphore m_lock;
51 atomic_t m_count;
52 atomic_t op_count;
53 /* opinfo count for streams */
54 atomic_t sop_count;
55 struct dentry *m_de;
56 unsigned int m_flags;
57 struct hlist_node m_hash;
58 struct list_head m_fp_list;
59 struct list_head m_op_list;
60 struct oplock_info *m_opinfo;
61 __le32 m_fattr;
62 };
63
64 enum {
65 FP_NEW = 0,
66 FP_INITED,
67 FP_CLOSED
68 };
69
70 struct ksmbd_file {
71 struct file *filp;
72 u64 persistent_id;
73 u64 volatile_id;
74
75 spinlock_t f_lock;
76
77 struct ksmbd_inode *f_ci;
78 struct ksmbd_inode *f_parent_ci;
79 struct oplock_info __rcu *f_opinfo;
80 struct ksmbd_conn *conn;
81 struct ksmbd_tree_connect *tcon;
82
83 atomic_t refcount;
84 __le32 daccess;
85 __le32 saccess;
86 __le32 coption;
87 __le32 cdoption;
88 __u64 create_time;
89 __u64 itime;
90
91 bool is_nt_open;
92 bool attrib_only;
93
94 char client_guid[16];
95 char create_guid[16];
96 char app_instance_id[16];
97
98 struct stream stream;
99 struct list_head node;
100 struct list_head blocked_works;
101 struct list_head lock_list;
102
103 unsigned int durable_timeout;
104 unsigned int durable_scavenger_timeout;
105
106 /* if ls is happening on directory, below is valid*/
107 struct ksmbd_readdir_data readdir_data;
108 int dot_dotdot[2];
109 unsigned int f_state;
110 bool reserve_lease_break;
111 bool is_durable;
112 bool is_persistent;
113 bool is_resilient;
114 };
115
set_ctx_actor(struct dir_context * ctx,filldir_t actor)116 static inline void set_ctx_actor(struct dir_context *ctx,
117 filldir_t actor)
118 {
119 ctx->actor = actor;
120 }
121
122 #define KSMBD_NR_OPEN_DEFAULT BITS_PER_LONG
123
124 struct ksmbd_file_table {
125 rwlock_t lock;
126 struct idr *idr;
127 };
128
has_file_id(u64 id)129 static inline bool has_file_id(u64 id)
130 {
131 return id < KSMBD_NO_FID;
132 }
133
ksmbd_stream_fd(struct ksmbd_file * fp)134 static inline bool ksmbd_stream_fd(struct ksmbd_file *fp)
135 {
136 return fp->stream.name != NULL;
137 }
138
139 int ksmbd_init_file_table(struct ksmbd_file_table *ft);
140 void ksmbd_destroy_file_table(struct ksmbd_file_table *ft);
141 int ksmbd_close_fd(struct ksmbd_work *work, u64 id);
142 struct ksmbd_file *ksmbd_lookup_fd_fast(struct ksmbd_work *work, u64 id);
143 struct ksmbd_file *ksmbd_lookup_foreign_fd(struct ksmbd_work *work, u64 id);
144 struct ksmbd_file *ksmbd_lookup_fd_slow(struct ksmbd_work *work, u64 id,
145 u64 pid);
146 void ksmbd_fd_put(struct ksmbd_work *work, struct ksmbd_file *fp);
147 struct ksmbd_inode *ksmbd_inode_lookup_lock(struct dentry *d);
148 void ksmbd_inode_put(struct ksmbd_inode *ci);
149 struct ksmbd_file *ksmbd_lookup_global_fd(unsigned long long id);
150 struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id);
151 void ksmbd_put_durable_fd(struct ksmbd_file *fp);
152 struct ksmbd_file *ksmbd_lookup_fd_cguid(char *cguid);
153 struct ksmbd_file *ksmbd_lookup_fd_inode(struct dentry *dentry);
154 unsigned int ksmbd_open_durable_fd(struct ksmbd_file *fp);
155 struct ksmbd_file *ksmbd_open_fd(struct ksmbd_work *work, struct file *filp);
156 void ksmbd_launch_ksmbd_durable_scavenger(void);
157 void ksmbd_stop_durable_scavenger(void);
158 void ksmbd_close_tree_conn_fds(struct ksmbd_work *work);
159 void ksmbd_close_session_fds(struct ksmbd_work *work);
160 int ksmbd_close_inode_fds(struct ksmbd_work *work, struct inode *inode);
161 int ksmbd_init_global_file_table(void);
162 void ksmbd_free_global_file_table(void);
163 void ksmbd_set_fd_limit(unsigned long limit);
164 void ksmbd_update_fstate(struct ksmbd_file_table *ft, struct ksmbd_file *fp,
165 unsigned int state);
166
167 /*
168 * INODE hash
169 */
170 int __init ksmbd_inode_hash_init(void);
171 void ksmbd_release_inode_hash(void);
172
173 enum KSMBD_INODE_STATUS {
174 KSMBD_INODE_STATUS_OK,
175 KSMBD_INODE_STATUS_UNKNOWN,
176 KSMBD_INODE_STATUS_PENDING_DELETE,
177 };
178
179 int ksmbd_query_inode_status(struct dentry *dentry);
180 bool ksmbd_inode_pending_delete(struct ksmbd_file *fp);
181 void ksmbd_set_inode_pending_delete(struct ksmbd_file *fp);
182 void ksmbd_clear_inode_pending_delete(struct ksmbd_file *fp);
183 void ksmbd_fd_set_delete_on_close(struct ksmbd_file *fp,
184 int file_info);
185 int ksmbd_reopen_durable_fd(struct ksmbd_work *work, struct ksmbd_file *fp);
186 int ksmbd_validate_name_reconnect(struct ksmbd_share_config *share,
187 struct ksmbd_file *fp, char *name);
188 int ksmbd_init_file_cache(void);
189 void ksmbd_exit_file_cache(void);
190 #endif /* __VFS_CACHE_H__ */
191