fs/nfs/callback.h

   1 /*
   2  * linux/fs/nfs/callback.h
   3  *
   4  * Copyright (C) 2004 Trond Myklebust
   5  *
   6  * NFSv4 callback definitions
   7  */
   8 #ifndef __LINUX_FS_NFS_CALLBACK_H
   9 #define __LINUX_FS_NFS_CALLBACK_H
  10 #include <linux/sunrpc/svc.h>
  11
  12 #define NFS4_CALLBACK 0x40000000
  13 #define NFS4_CALLBACK_XDRSIZE 2048
  14 #define NFS4_CALLBACK_BUFSIZE (1024 + NFS4_CALLBACK_XDRSIZE)
  15
  16 enum nfs4_callback_procnum {
  17         CB_NULL = 0,
  18         CB_COMPOUND = 1,
  19 };
  20
  21 enum nfs4_callback_opnum {
  22         OP_CB_GETATTR = 3,
  23         OP_CB_RECALL  = 4,
  24 /* Callback operations new to NFSv4.1 */
  25         OP_CB_LAYOUTRECALL  = 5,
  26         OP_CB_NOTIFY        = 6,
  27         OP_CB_PUSH_DELEG    = 7,
  28         OP_CB_RECALL_ANY    = 8,
  29         OP_CB_RECALLABLE_OBJ_AVAIL = 9,
  30         OP_CB_RECALL_SLOT   = 10,
  31         OP_CB_SEQUENCE      = 11,
  32         OP_CB_WANTS_CANCELLED = 12,
  33         OP_CB_NOTIFY_LOCK   = 13,
  34         OP_CB_NOTIFY_DEVICEID = 14,
  35 /* Callback operations new to NFSv4.2 */
  36         OP_CB_OFFLOAD = 15,
  37         OP_CB_ILLEGAL = 10044,
  38 };
  39
  40 struct cb_process_state {
  41         __be32                  drc_status;
  42         struct nfs_client       *clp;
  43         u32                     slotid;
  44         u32                     minorversion;
  45         struct net              *net;
  46 };
  47
  48 struct cb_compound_hdr_arg {
  49         unsigned int taglen;
  50         const char *tag;
  51         unsigned int minorversion;
  52         unsigned int cb_ident; /* v4.0 callback identifier */
  53         unsigned nops;
  54 };
  55
  56 struct cb_compound_hdr_res {
  57         __be32 *status;
  58         unsigned int taglen;
  59         const char *tag;
  60         __be32 *nops;
  61 };
  62
  63 struct cb_getattrargs {
  64         struct nfs_fh fh;
  65         uint32_t bitmap[2];
  66 };
  67
  68 struct cb_getattrres {
  69         __be32 status;
  70         uint32_t bitmap[2];
  71         uint64_t size;
  72         uint64_t change_attr;
  73         struct timespec ctime;
  74         struct timespec mtime;
  75 };
  76
  77 struct cb_recallargs {
  78         struct nfs_fh fh;
  79         nfs4_stateid stateid;
  80         uint32_t truncate;
  81 };
  82
  83 #if defined(CONFIG_NFS_V4_1)
  84
  85 struct referring_call {
  86         uint32_t                        rc_sequenceid;
  87         uint32_t                        rc_slotid;
  88 };
  89
  90 struct referring_call_list {
  91         struct nfs4_sessionid           rcl_sessionid;
  92         uint32_t                        rcl_nrefcalls;
  93         struct referring_call           *rcl_refcalls;
  94 };
  95
  96 struct cb_sequenceargs {
  97         struct sockaddr                 *csa_addr;
  98         struct nfs4_sessionid           csa_sessionid;
  99         uint32_t                        csa_sequenceid;
 100         uint32_t                        csa_slotid;
 101         uint32_t                        csa_highestslotid;
 102         uint32_t                        csa_cachethis;
 103         uint32_t                        csa_nrclists;
 104         struct referring_call_list      *csa_rclists;
 105 };
 106
 107 struct cb_sequenceres {
 108         __be32                          csr_status;
 109         struct nfs4_sessionid           csr_sessionid;
 110         uint32_t                        csr_sequenceid;
 111         uint32_t                        csr_slotid;
 112         uint32_t                        csr_highestslotid;
 113         uint32_t                        csr_target_highestslotid;
 114 };
 115
 116 extern __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
 117                                        struct cb_sequenceres *res,
 118                                        struct cb_process_state *cps);
 119
 120 #define RCA4_TYPE_MASK_RDATA_DLG        0
 121 #define RCA4_TYPE_MASK_WDATA_DLG        1
 122 #define RCA4_TYPE_MASK_DIR_DLG         2
 123 #define RCA4_TYPE_MASK_FILE_LAYOUT     3
 124 #define RCA4_TYPE_MASK_BLK_LAYOUT      4
 125 #define RCA4_TYPE_MASK_OBJ_LAYOUT_MIN  8
 126 #define RCA4_TYPE_MASK_OBJ_LAYOUT_MAX  9
 127 #define RCA4_TYPE_MASK_OTHER_LAYOUT_MIN 12
 128 #define RCA4_TYPE_MASK_OTHER_LAYOUT_MAX 15
 129 #define RCA4_TYPE_MASK_ALL 0xf31f
 130
 131 struct cb_recallanyargs {
 132         uint32_t        craa_objs_to_keep;
 133         uint32_t        craa_type_mask;
 134 };
 135
 136 extern __be32 nfs4_callback_recallany(struct cb_recallanyargs *args,
 137                                         void *dummy,
 138                                         struct cb_process_state *cps);
 139
 140 struct cb_recallslotargs {
 141         uint32_t        crsa_target_highest_slotid;
 142 };
 143 extern __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args,
 144                                          void *dummy,
 145                                          struct cb_process_state *cps);
 146
 147 struct cb_layoutrecallargs {
 148         uint32_t                cbl_recall_type;
 149         uint32_t                cbl_layout_type;
 150         uint32_t                cbl_layoutchanged;
 151         union {
 152                 struct {
 153                         struct nfs_fh           cbl_fh;
 154                         struct pnfs_layout_range cbl_range;
 155                         nfs4_stateid            cbl_stateid;
 156                 };
 157                 struct nfs_fsid         cbl_fsid;
 158         };
 159 };
 160
 161 extern __be32 nfs4_callback_layoutrecall(
 162         struct cb_layoutrecallargs *args,
 163         void *dummy, struct cb_process_state *cps);
 164
 165 struct cb_devicenotifyitem {
 166         uint32_t                cbd_notify_type;
 167         uint32_t                cbd_layout_type;
 168         struct nfs4_deviceid    cbd_dev_id;
 169         uint32_t                cbd_immediate;
 170 };
 171
 172 struct cb_devicenotifyargs {
 173         int                              ndevs;
 174         struct cb_devicenotifyitem       *devs;
 175 };
 176
 177 extern __be32 nfs4_callback_devicenotify(
 178         struct cb_devicenotifyargs *args,
 179         void *dummy, struct cb_process_state *cps);
 180
 181 #endif /* CONFIG_NFS_V4_1 */
 182 extern int check_gss_callback_principal(struct nfs_client *, struct svc_rqst *);
 183 extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args,
 184                                     struct cb_getattrres *res,
 185                                     struct cb_process_state *cps);
 186 extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
 187                                    struct cb_process_state *cps);
 188 #if IS_ENABLED(CONFIG_NFS_V4)
 189 extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
 190 extern void nfs_callback_down(int minorversion, struct net *net);
 191 #endif /* CONFIG_NFS_V4 */
 192 /*
 193  * nfs41: Callbacks are expected to not cause substantial latency,
 194  * so we limit their concurrency to 1 by setting up the maximum number
 195  * of slots for the backchannel.
 196  */
 197 #define NFS41_BC_MIN_CALLBACKS 1
 198 #define NFS41_BC_MAX_CALLBACKS 1
 199
 200 extern unsigned int nfs_callback_set_tcpport;
 201
 202 #endif /* __LINUX_FS_NFS_CALLBACK_H */