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         OP_CB_ILLEGAL = 10044,
  36 };
  37
  38 struct cb_process_state {
  39         __be32                  drc_status;
  40         struct nfs_client       *clp;
  41         u32                     slotid;
  42         struct net              *net;
  43 };
  44
  45 struct cb_compound_hdr_arg {
  46         unsigned int taglen;
  47         const char *tag;
  48         unsigned int minorversion;
  49         unsigned int cb_ident; /* v4.0 callback identifier */
  50         unsigned nops;
  51 };
  52
  53 struct cb_compound_hdr_res {
  54         __be32 *status;
  55         unsigned int taglen;
  56         const char *tag;
  57         __be32 *nops;
  58 };
  59
  60 struct cb_getattrargs {
  61         struct sockaddr *addr;
  62         struct nfs_fh fh;
  63         uint32_t bitmap[2];
  64 };
  65
  66 struct cb_getattrres {
  67         __be32 status;
  68         uint32_t bitmap[2];
  69         uint64_t size;
  70         uint64_t change_attr;
  71         struct timespec ctime;
  72         struct timespec mtime;
  73 };
  74
  75 struct cb_recallargs {
  76         struct sockaddr *addr;
  77         struct nfs_fh fh;
  78         nfs4_stateid stateid;
  79         uint32_t truncate;
  80 };
  81
  82 #if defined(CONFIG_NFS_V4_1)
  83
  84 struct referring_call {
  85         uint32_t                        rc_sequenceid;
  86         uint32_t                        rc_slotid;
  87 };
  88
  89 struct referring_call_list {
  90         struct nfs4_sessionid           rcl_sessionid;
  91         uint32_t                        rcl_nrefcalls;
  92         struct referring_call           *rcl_refcalls;
  93 };
  94
  95 struct cb_sequenceargs {
  96         struct sockaddr                 *csa_addr;
  97         struct nfs4_sessionid           csa_sessionid;
  98         uint32_t                        csa_sequenceid;
  99         uint32_t                        csa_slotid;
 100         uint32_t                        csa_highestslotid;
 101         uint32_t                        csa_cachethis;
 102         uint32_t                        csa_nrclists;
 103         struct referring_call_list      *csa_rclists;
 104 };
 105
 106 struct cb_sequenceres {
 107         __be32                          csr_status;
 108         struct nfs4_sessionid           csr_sessionid;
 109         uint32_t                        csr_sequenceid;
 110         uint32_t                        csr_slotid;
 111         uint32_t                        csr_highestslotid;
 112         uint32_t                        csr_target_highestslotid;
 113 };
 114
 115 extern __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
 116                                        struct cb_sequenceres *res,
 117                                        struct cb_process_state *cps);
 118
 119 extern int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation,
 120                                              const nfs4_stateid *stateid);
 121
 122 #define RCA4_TYPE_MASK_RDATA_DLG        0
 123 #define RCA4_TYPE_MASK_WDATA_DLG        1
 124 #define RCA4_TYPE_MASK_DIR_DLG         2
 125 #define RCA4_TYPE_MASK_FILE_LAYOUT     3
 126 #define RCA4_TYPE_MASK_BLK_LAYOUT      4
 127 #define RCA4_TYPE_MASK_OBJ_LAYOUT_MIN  8
 128 #define RCA4_TYPE_MASK_OBJ_LAYOUT_MAX  9
 129 #define RCA4_TYPE_MASK_OTHER_LAYOUT_MIN 12
 130 #define RCA4_TYPE_MASK_OTHER_LAYOUT_MAX 15
 131 #define RCA4_TYPE_MASK_ALL 0xf31f
 132
 133 struct cb_recallanyargs {
 134         struct sockaddr *craa_addr;
 135         uint32_t        craa_objs_to_keep;
 136         uint32_t        craa_type_mask;
 137 };
 138
 139 extern __be32 nfs4_callback_recallany(struct cb_recallanyargs *args,
 140                                         void *dummy,
 141                                         struct cb_process_state *cps);
 142
 143 struct cb_recallslotargs {
 144         struct sockaddr *crsa_addr;
 145         uint32_t        crsa_target_highest_slotid;
 146 };
 147 extern __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args,
 148                                          void *dummy,
 149                                          struct cb_process_state *cps);
 150
 151 struct cb_layoutrecallargs {
 152         struct sockaddr         *cbl_addr;
 153         uint32_t                cbl_recall_type;
 154         uint32_t                cbl_layout_type;
 155         uint32_t                cbl_layoutchanged;
 156         union {
 157                 struct {
 158                         struct nfs_fh           cbl_fh;
 159                         struct pnfs_layout_range cbl_range;
 160                         nfs4_stateid            cbl_stateid;
 161                 };
 162                 struct nfs_fsid         cbl_fsid;
 163         };
 164 };
 165
 166 extern __be32 nfs4_callback_layoutrecall(
 167         struct cb_layoutrecallargs *args,
 168         void *dummy, struct cb_process_state *cps);
 169
 170 struct cb_devicenotifyitem {
 171         uint32_t                cbd_notify_type;
 172         uint32_t                cbd_layout_type;
 173         struct nfs4_deviceid    cbd_dev_id;
 174         uint32_t                cbd_immediate;
 175 };
 176
 177 struct cb_devicenotifyargs {
 178         int                              ndevs;
 179         struct cb_devicenotifyitem       *devs;
 180 };
 181
 182 extern __be32 nfs4_callback_devicenotify(
 183         struct cb_devicenotifyargs *args,
 184         void *dummy, struct cb_process_state *cps);
 185
 186 #endif /* CONFIG_NFS_V4_1 */
 187 extern int check_gss_callback_principal(struct nfs_client *, struct svc_rqst *);
 188 extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args,
 189                                     struct cb_getattrres *res,
 190                                     struct cb_process_state *cps);
 191 extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
 192                                    struct cb_process_state *cps);
 193 #if IS_ENABLED(CONFIG_NFS_V4)
 194 extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
 195 extern void nfs_callback_down(int minorversion, struct net *net);
 196 extern int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation,
 197                                             const nfs4_stateid *stateid);
 198 extern int nfs4_set_callback_sessionid(struct nfs_client *clp);
 199 #endif /* CONFIG_NFS_V4 */
 200 /*
 201  * nfs41: Callbacks are expected to not cause substantial latency,
 202  * so we limit their concurrency to 1 by setting up the maximum number
 203  * of slots for the backchannel.
 204  */
 205 #define NFS41_BC_MIN_CALLBACKS 1
 206 #define NFS41_BC_MAX_CALLBACKS 1
 207
 208 extern unsigned int nfs_callback_set_tcpport;
 209 extern unsigned short nfs_callback_tcpport;
 210
 211 #endif /* __LINUX_FS_NFS_CALLBACK_H */