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 sockaddr *addr;
  65         struct nfs_fh fh;
  66         uint32_t bitmap[2];
  67 };
  68
  69 struct cb_getattrres {
  70         __be32 status;
  71         uint32_t bitmap[2];
  72         uint64_t size;
  73         uint64_t change_attr;
  74         struct timespec ctime;
  75         struct timespec mtime;
  76 };
  77
  78 struct cb_recallargs {
  79         struct sockaddr *addr;
  80         struct nfs_fh fh;
  81         nfs4_stateid stateid;
  82         uint32_t truncate;
  83 };
  84
  85 #if defined(CONFIG_NFS_V4_1)
  86
  87 struct referring_call {
  88         uint32_t                        rc_sequenceid;
  89         uint32_t                        rc_slotid;
  90 };
  91
  92 struct referring_call_list {
  93         struct nfs4_sessionid           rcl_sessionid;
  94         uint32_t                        rcl_nrefcalls;
  95         struct referring_call           *rcl_refcalls;
  96 };
  97
  98 struct cb_sequenceargs {
  99         struct sockaddr                 *csa_addr;
 100         struct nfs4_sessionid           csa_sessionid;
 101         uint32_t                        csa_sequenceid;
 102         uint32_t                        csa_slotid;
 103         uint32_t                        csa_highestslotid;
 104         uint32_t                        csa_cachethis;
 105         uint32_t                        csa_nrclists;
 106         struct referring_call_list      *csa_rclists;
 107 };
 108
 109 struct cb_sequenceres {
 110         __be32                          csr_status;
 111         struct nfs4_sessionid           csr_sessionid;
 112         uint32_t                        csr_sequenceid;
 113         uint32_t                        csr_slotid;
 114         uint32_t                        csr_highestslotid;
 115         uint32_t                        csr_target_highestslotid;
 116 };
 117
 118 extern __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
 119                                        struct cb_sequenceres *res,
 120                                        struct cb_process_state *cps);
 121
 122 extern int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation,
 123                                              const nfs4_stateid *stateid);
 124
 125 #define RCA4_TYPE_MASK_RDATA_DLG        0
 126 #define RCA4_TYPE_MASK_WDATA_DLG        1
 127 #define RCA4_TYPE_MASK_DIR_DLG         2
 128 #define RCA4_TYPE_MASK_FILE_LAYOUT     3
 129 #define RCA4_TYPE_MASK_BLK_LAYOUT      4
 130 #define RCA4_TYPE_MASK_OBJ_LAYOUT_MIN  8
 131 #define RCA4_TYPE_MASK_OBJ_LAYOUT_MAX  9
 132 #define RCA4_TYPE_MASK_OTHER_LAYOUT_MIN 12
 133 #define RCA4_TYPE_MASK_OTHER_LAYOUT_MAX 15
 134 #define RCA4_TYPE_MASK_ALL 0xf31f
 135
 136 struct cb_recallanyargs {
 137         struct sockaddr *craa_addr;
 138         uint32_t        craa_objs_to_keep;
 139         uint32_t        craa_type_mask;
 140 };
 141
 142 extern __be32 nfs4_callback_recallany(struct cb_recallanyargs *args,
 143                                         void *dummy,
 144                                         struct cb_process_state *cps);
 145
 146 struct cb_recallslotargs {
 147         struct sockaddr *crsa_addr;
 148         uint32_t        crsa_target_highest_slotid;
 149 };
 150 extern __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args,
 151                                          void *dummy,
 152                                          struct cb_process_state *cps);
 153
 154 struct cb_layoutrecallargs {
 155         struct sockaddr         *cbl_addr;
 156         uint32_t                cbl_recall_type;
 157         uint32_t                cbl_layout_type;
 158         uint32_t                cbl_layoutchanged;
 159         union {
 160                 struct {
 161                         struct nfs_fh           cbl_fh;
 162                         struct pnfs_layout_range cbl_range;
 163                         nfs4_stateid            cbl_stateid;
 164                 };
 165                 struct nfs_fsid         cbl_fsid;
 166         };
 167 };
 168
 169 extern __be32 nfs4_callback_layoutrecall(
 170         struct cb_layoutrecallargs *args,
 171         void *dummy, struct cb_process_state *cps);
 172
 173 struct cb_devicenotifyitem {
 174         uint32_t                cbd_notify_type;
 175         uint32_t                cbd_layout_type;
 176         struct nfs4_deviceid    cbd_dev_id;
 177         uint32_t                cbd_immediate;
 178 };
 179
 180 struct cb_devicenotifyargs {
 181         int                              ndevs;
 182         struct cb_devicenotifyitem       *devs;
 183 };
 184
 185 extern __be32 nfs4_callback_devicenotify(
 186         struct cb_devicenotifyargs *args,
 187         void *dummy, struct cb_process_state *cps);
 188
 189 #endif /* CONFIG_NFS_V4_1 */
 190 extern int check_gss_callback_principal(struct nfs_client *, struct svc_rqst *);
 191 extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args,
 192                                     struct cb_getattrres *res,
 193                                     struct cb_process_state *cps);
 194 extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
 195                                    struct cb_process_state *cps);
 196 #if IS_ENABLED(CONFIG_NFS_V4)
 197 extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
 198 extern void nfs_callback_down(int minorversion, struct net *net);
 199 extern int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation,
 200                                             const nfs4_stateid *stateid);
 201 extern int nfs4_set_callback_sessionid(struct nfs_client *clp);
 202 #endif /* CONFIG_NFS_V4 */
 203 /*
 204  * nfs41: Callbacks are expected to not cause substantial latency,
 205  * so we limit their concurrency to 1 by setting up the maximum number
 206  * of slots for the backchannel.
 207  */
 208 #define NFS41_BC_MIN_CALLBACKS 1
 209 #define NFS41_BC_MAX_CALLBACKS 1
 210
 211 extern unsigned int nfs_callback_set_tcpport;
 212 extern unsigned short nfs_callback_tcpport;
 213
 214 #endif /* __LINUX_FS_NFS_CALLBACK_H */