xref: /linux/fs/smb/server/ksmbd_work.h (revision a1c613ae4c322ddd58d5a8539dbfba2a0380a8c0)
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  *   Copyright (C) 2019 Samsung Electronics Co., Ltd.
4  */
5 
6 #ifndef __KSMBD_WORK_H__
7 #define __KSMBD_WORK_H__
8 
9 #include <linux/ctype.h>
10 #include <linux/workqueue.h>
11 
12 struct ksmbd_conn;
13 struct ksmbd_session;
14 struct ksmbd_tree_connect;
15 
16 enum {
17 	KSMBD_WORK_ACTIVE = 0,
18 	KSMBD_WORK_CANCELLED,
19 	KSMBD_WORK_CLOSED,
20 };
21 
22 struct aux_read {
23 	void *buf;
24 	struct list_head entry;
25 };
26 
27 /* one of these for every pending CIFS request at the connection */
28 struct ksmbd_work {
29 	/* Server corresponding to this mid */
30 	struct ksmbd_conn               *conn;
31 	struct ksmbd_session            *sess;
32 	struct ksmbd_tree_connect       *tcon;
33 
34 	/* Pointer to received SMB header */
35 	void                            *request_buf;
36 	/* Response buffer */
37 	void                            *response_buf;
38 
39 	struct list_head		aux_read_list;
40 
41 	struct kvec			*iov;
42 	int				iov_alloc_cnt;
43 	int				iov_cnt;
44 	int				iov_idx;
45 
46 	/* Next cmd hdr in compound req buf*/
47 	int                             next_smb2_rcv_hdr_off;
48 	/* Next cmd hdr in compound rsp buf*/
49 	int                             next_smb2_rsp_hdr_off;
50 	/* Current cmd hdr in compound rsp buf*/
51 	int                             curr_smb2_rsp_hdr_off;
52 
53 	/*
54 	 * Current Local FID assigned compound response if SMB2 CREATE
55 	 * command is present in compound request
56 	 */
57 	u64				compound_fid;
58 	u64				compound_pfid;
59 	u64				compound_sid;
60 
61 	const struct cred		*saved_cred;
62 
63 	/* Number of granted credits */
64 	unsigned int			credits_granted;
65 
66 	/* response smb header size */
67 	unsigned int                    response_sz;
68 
69 	void				*tr_buf;
70 
71 	unsigned char			state;
72 	/* No response for cancelled request */
73 	bool                            send_no_response:1;
74 	/* Request is encrypted */
75 	bool                            encrypted:1;
76 	/* Is this SYNC or ASYNC ksmbd_work */
77 	bool                            asynchronous:1;
78 	bool                            need_invalidate_rkey:1;
79 
80 	unsigned int                    remote_key;
81 	/* cancel works */
82 	int                             async_id;
83 	void                            **cancel_argv;
84 	void                            (*cancel_fn)(void **argv);
85 
86 	struct work_struct              work;
87 	/* List head at conn->requests */
88 	struct list_head                request_entry;
89 	/* List head at conn->async_requests */
90 	struct list_head                async_request_entry;
91 	struct list_head                fp_entry;
92 	struct list_head                interim_entry;
93 };
94 
95 /**
96  * ksmbd_resp_buf_next - Get next buffer on compound response.
97  * @work: smb work containing response buffer
98  */
ksmbd_resp_buf_next(struct ksmbd_work * work)99 static inline void *ksmbd_resp_buf_next(struct ksmbd_work *work)
100 {
101 	return work->response_buf + work->next_smb2_rsp_hdr_off + 4;
102 }
103 
104 /**
105  * ksmbd_resp_buf_curr - Get current buffer on compound response.
106  * @work: smb work containing response buffer
107  */
ksmbd_resp_buf_curr(struct ksmbd_work * work)108 static inline void *ksmbd_resp_buf_curr(struct ksmbd_work *work)
109 {
110 	return work->response_buf + work->curr_smb2_rsp_hdr_off + 4;
111 }
112 
113 /**
114  * ksmbd_req_buf_next - Get next buffer on compound request.
115  * @work: smb work containing response buffer
116  */
ksmbd_req_buf_next(struct ksmbd_work * work)117 static inline void *ksmbd_req_buf_next(struct ksmbd_work *work)
118 {
119 	return work->request_buf + work->next_smb2_rcv_hdr_off + 4;
120 }
121 
122 struct ksmbd_work *ksmbd_alloc_work_struct(void);
123 void ksmbd_free_work_struct(struct ksmbd_work *work);
124 
125 void ksmbd_work_pool_destroy(void);
126 int ksmbd_work_pool_init(void);
127 
128 int ksmbd_workqueue_init(void);
129 void ksmbd_workqueue_destroy(void);
130 bool ksmbd_queue_work(struct ksmbd_work *work);
131 int ksmbd_iov_pin_rsp_read(struct ksmbd_work *work, void *ib, int len,
132 			   void *aux_buf, unsigned int aux_size);
133 int ksmbd_iov_pin_rsp(struct ksmbd_work *work, void *ib, int len);
134 int allocate_interim_rsp_buf(struct ksmbd_work *work);
135 #endif /* __KSMBD_WORK_H__ */
136