1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org> 4 * Copyright (C) 2018 Samsung Electronics Co., Ltd. 5 */ 6 7 #ifndef __KSMBD_OPLOCK_H 8 #define __KSMBD_OPLOCK_H 9 10 #include "smb_common.h" 11 12 #define OPLOCK_WAIT_TIME (35 * HZ) 13 14 /* Oplock states */ 15 #define OPLOCK_STATE_NONE 0x00 16 #define OPLOCK_ACK_WAIT 0x01 17 #define OPLOCK_CLOSING 0x02 18 19 #define OPLOCK_WRITE_TO_READ 0x01 20 #define OPLOCK_READ_HANDLE_TO_READ 0x02 21 #define OPLOCK_WRITE_TO_NONE 0x04 22 #define OPLOCK_READ_TO_NONE 0x08 23 24 struct lease_ctx_info { 25 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; 26 __le32 req_state; 27 __le32 flags; 28 __le64 duration; 29 __u8 parent_lease_key[SMB2_LEASE_KEY_SIZE]; 30 __le16 epoch; 31 int version; 32 bool is_dir; 33 }; 34 35 struct lease_table { 36 char client_guid[SMB2_CLIENT_GUID_SIZE]; 37 struct list_head lease_list; 38 struct list_head l_entry; 39 spinlock_t lb_lock; 40 }; 41 42 struct lease { 43 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; 44 __le32 state; 45 __le32 new_state; 46 __le32 flags; 47 __le64 duration; 48 __u8 parent_lease_key[SMB2_LEASE_KEY_SIZE]; 49 int version; 50 unsigned short epoch; 51 bool is_dir; 52 struct lease_table *l_lb; 53 }; 54 55 struct oplock_info { 56 struct ksmbd_conn *conn; 57 struct ksmbd_session *sess; 58 struct ksmbd_work *work; 59 struct ksmbd_file *o_fp; 60 int level; 61 int op_state; 62 unsigned long pending_break; 63 u64 fid; 64 atomic_t breaking_cnt; 65 atomic_t refcount; 66 __u16 Tid; 67 bool is_lease; 68 bool open_trunc; /* truncate on open */ 69 struct lease *o_lease; 70 struct list_head op_entry; 71 struct list_head lease_entry; 72 wait_queue_head_t oplock_q; /* Other server threads */ 73 wait_queue_head_t oplock_brk; /* oplock breaking wait */ 74 struct rcu_head rcu_head; 75 }; 76 77 struct lease_break_info { 78 __le32 curr_state; 79 __le32 new_state; 80 __le16 epoch; 81 char lease_key[SMB2_LEASE_KEY_SIZE]; 82 }; 83 84 struct oplock_break_info { 85 int level; 86 int open_trunc; 87 int fid; 88 }; 89 90 int smb_grant_oplock(struct ksmbd_work *work, int req_op_level, 91 u64 pid, struct ksmbd_file *fp, __u16 tid, 92 struct lease_ctx_info *lctx, int share_ret); 93 void smb_break_all_levII_oplock(struct ksmbd_work *work, 94 struct ksmbd_file *fp, int is_trunc); 95 int opinfo_write_to_read(struct oplock_info *opinfo); 96 int opinfo_read_handle_to_read(struct oplock_info *opinfo); 97 int opinfo_write_to_none(struct oplock_info *opinfo); 98 int opinfo_read_to_none(struct oplock_info *opinfo); 99 void close_id_del_oplock(struct ksmbd_file *fp); 100 void smb_break_all_oplock(struct ksmbd_work *work, struct ksmbd_file *fp); 101 struct oplock_info *opinfo_get(struct ksmbd_file *fp); 102 void opinfo_put(struct oplock_info *opinfo); 103 104 /* Lease related functions */ 105 void create_lease_buf(u8 *rbuf, struct lease *lease); 106 struct lease_ctx_info *parse_lease_state(void *open_req); 107 __u8 smb2_map_lease_to_oplock(__le32 lease_state); 108 int lease_read_to_write(struct oplock_info *opinfo); 109 110 /* Durable related functions */ 111 void create_durable_rsp_buf(char *cc); 112 void create_durable_v2_rsp_buf(char *cc, struct ksmbd_file *fp); 113 void create_mxac_rsp_buf(char *cc, int maximal_access); 114 void create_disk_id_rsp_buf(char *cc, __u64 file_id, __u64 vol_id); 115 void create_posix_rsp_buf(char *cc, struct ksmbd_file *fp); 116 struct create_context *smb2_find_context_vals(void *open_req, const char *tag, int tag_len); 117 struct oplock_info *lookup_lease_in_table(struct ksmbd_conn *conn, 118 char *lease_key); 119 int find_same_lease_key(struct ksmbd_session *sess, struct ksmbd_inode *ci, 120 struct lease_ctx_info *lctx); 121 void destroy_lease_table(struct ksmbd_conn *conn); 122 void smb_send_parent_lease_break_noti(struct ksmbd_file *fp, 123 struct lease_ctx_info *lctx); 124 void smb_lazy_parent_lease_break_close(struct ksmbd_file *fp); 125 int smb2_check_durable_oplock(struct ksmbd_conn *conn, 126 struct ksmbd_share_config *share, 127 struct ksmbd_file *fp, 128 struct lease_ctx_info *lctx, 129 char *name); 130 #endif /* __KSMBD_OPLOCK_H */ 131