fs/smb/server/oplock.h

   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 /* SMB2 Oplock levels */
  15 #define SMB2_OPLOCK_LEVEL_NONE          0x00
  16 #define SMB2_OPLOCK_LEVEL_II            0x01
  17 #define SMB2_OPLOCK_LEVEL_EXCLUSIVE     0x08
  18 #define SMB2_OPLOCK_LEVEL_BATCH         0x09
  19 #define SMB2_OPLOCK_LEVEL_LEASE         0xFF
  20
  21 /* Oplock states */
  22 #define OPLOCK_STATE_NONE       0x00
  23 #define OPLOCK_ACK_WAIT         0x01
  24 #define OPLOCK_CLOSING          0x02
  25
  26 #define OPLOCK_WRITE_TO_READ            0x01
  27 #define OPLOCK_READ_HANDLE_TO_READ      0x02
  28 #define OPLOCK_WRITE_TO_NONE            0x04
  29 #define OPLOCK_READ_TO_NONE             0x08
  30
  31 struct lease_ctx_info {
  32         __u8                    lease_key[SMB2_LEASE_KEY_SIZE];
  33         __le32                  req_state;
  34         __le32                  flags;
  35         __le64                  duration;
  36         __u8                    parent_lease_key[SMB2_LEASE_KEY_SIZE];
  37         __le16                  epoch;
  38         int                     version;
  39         bool                    is_dir;
  40 };
  41
  42 struct lease_table {
  43         char                    client_guid[SMB2_CLIENT_GUID_SIZE];
  44         struct list_head        lease_list;
  45         struct list_head        l_entry;
  46         spinlock_t              lb_lock;
  47 };
  48
  49 struct lease {
  50         __u8                    lease_key[SMB2_LEASE_KEY_SIZE];
  51         __le32                  state;
  52         __le32                  new_state;
  53         __le32                  flags;
  54         __le64                  duration;
  55         __u8                    parent_lease_key[SMB2_LEASE_KEY_SIZE];
  56         int                     version;
  57         unsigned short          epoch;
  58         bool                    is_dir;
  59         struct lease_table      *l_lb;
  60 };
  61
  62 struct oplock_info {
  63         struct ksmbd_conn       *conn;
  64         struct ksmbd_session    *sess;
  65         struct ksmbd_work       *work;
  66         struct ksmbd_file       *o_fp;
  67         int                     level;
  68         int                     op_state;
  69         unsigned long           pending_break;
  70         u64                     fid;
  71         atomic_t                breaking_cnt;
  72         atomic_t                refcount;
  73         __u16                   Tid;
  74         bool                    is_lease;
  75         bool                    open_trunc;     /* truncate on open */
  76         struct lease            *o_lease;
  77         struct list_head        interim_list;
  78         struct list_head        op_entry;
  79         struct list_head        lease_entry;
  80         wait_queue_head_t oplock_q; /* Other server threads */
  81         wait_queue_head_t oplock_brk; /* oplock breaking wait */
  82         struct rcu_head         rcu_head;
  83 };
  84
  85 struct lease_break_info {
  86         __le32                  curr_state;
  87         __le32                  new_state;
  88         __le16                  epoch;
  89         char                    lease_key[SMB2_LEASE_KEY_SIZE];
  90 };
  91
  92 struct oplock_break_info {
  93         int level;
  94         int open_trunc;
  95         int fid;
  96 };
  97
  98 int smb_grant_oplock(struct ksmbd_work *work, int req_op_level,
  99                      u64 pid, struct ksmbd_file *fp, __u16 tid,
 100                      struct lease_ctx_info *lctx, int share_ret);
 101 void smb_break_all_levII_oplock(struct ksmbd_work *work,
 102                                 struct ksmbd_file *fp, int is_trunc);
 103 int opinfo_write_to_read(struct oplock_info *opinfo);
 104 int opinfo_read_handle_to_read(struct oplock_info *opinfo);
 105 int opinfo_write_to_none(struct oplock_info *opinfo);
 106 int opinfo_read_to_none(struct oplock_info *opinfo);
 107 void close_id_del_oplock(struct ksmbd_file *fp);
 108 void smb_break_all_oplock(struct ksmbd_work *work, struct ksmbd_file *fp);
 109 struct oplock_info *opinfo_get(struct ksmbd_file *fp);
 110 void opinfo_put(struct oplock_info *opinfo);
 111
 112 /* Lease related functions */
 113 void create_lease_buf(u8 *rbuf, struct lease *lease);
 114 struct lease_ctx_info *parse_lease_state(void *open_req, bool is_dir);
 115 __u8 smb2_map_lease_to_oplock(__le32 lease_state);
 116 int lease_read_to_write(struct oplock_info *opinfo);
 117
 118 /* Durable related functions */
 119 void create_durable_rsp_buf(char *cc);
 120 void create_durable_v2_rsp_buf(char *cc, struct ksmbd_file *fp);
 121 void create_mxac_rsp_buf(char *cc, int maximal_access);
 122 void create_disk_id_rsp_buf(char *cc, __u64 file_id, __u64 vol_id);
 123 void create_posix_rsp_buf(char *cc, struct ksmbd_file *fp);
 124 struct create_context *smb2_find_context_vals(void *open_req, const char *tag, int tag_len);
 125 struct oplock_info *lookup_lease_in_table(struct ksmbd_conn *conn,
 126                                           char *lease_key);
 127 int find_same_lease_key(struct ksmbd_session *sess, struct ksmbd_inode *ci,
 128                         struct lease_ctx_info *lctx);
 129 void destroy_lease_table(struct ksmbd_conn *conn);
 130 void smb_send_parent_lease_break_noti(struct ksmbd_file *fp,
 131                                       struct lease_ctx_info *lctx);
 132 void smb_lazy_parent_lease_break_close(struct ksmbd_file *fp);
 133 #endif /* __KSMBD_OPLOCK_H */