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 */ 203