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Linux/fs/nfs/callback.h

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  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 nfs4_slot;
 41 struct cb_process_state {
 42         __be32                  drc_status;
 43         struct nfs_client       *clp;
 44         struct nfs4_slot        *slot;
 45         u32                     minorversion;
 46         struct net              *net;
 47 };
 48 
 49 struct cb_compound_hdr_arg {
 50         unsigned int taglen;
 51         const char *tag;
 52         unsigned int minorversion;
 53         unsigned int cb_ident; /* v4.0 callback identifier */
 54         unsigned nops;
 55 };
 56 
 57 struct cb_compound_hdr_res {
 58         __be32 *status;
 59         unsigned int taglen;
 60         const char *tag;
 61         __be32 *nops;
 62 };
 63 
 64 struct cb_getattrargs {
 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 nfs_fh fh;
 80         nfs4_stateid stateid;
 81         uint32_t truncate;
 82 };
 83 
 84 #if defined(CONFIG_NFS_V4_1)
 85 
 86 struct referring_call {
 87         uint32_t                        rc_sequenceid;
 88         uint32_t                        rc_slotid;
 89 };
 90 
 91 struct referring_call_list {
 92         struct nfs4_sessionid           rcl_sessionid;
 93         uint32_t                        rcl_nrefcalls;
 94         struct referring_call           *rcl_refcalls;
 95 };
 96 
 97 struct cb_sequenceargs {
 98         struct sockaddr                 *csa_addr;
 99         struct nfs4_sessionid           csa_sessionid;
100         uint32_t                        csa_sequenceid;
101         uint32_t                        csa_slotid;
102         uint32_t                        csa_highestslotid;
103         uint32_t                        csa_cachethis;
104         uint32_t                        csa_nrclists;
105         struct referring_call_list      *csa_rclists;
106 };
107 
108 struct cb_sequenceres {
109         __be32                          csr_status;
110         struct nfs4_sessionid           csr_sessionid;
111         uint32_t                        csr_sequenceid;
112         uint32_t                        csr_slotid;
113         uint32_t                        csr_highestslotid;
114         uint32_t                        csr_target_highestslotid;
115 };
116 
117 extern __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
118                                        struct cb_sequenceres *res,
119                                        struct cb_process_state *cps);
120 
121 #define RCA4_TYPE_MASK_RDATA_DLG        0
122 #define RCA4_TYPE_MASK_WDATA_DLG        1
123 #define RCA4_TYPE_MASK_DIR_DLG         2
124 #define RCA4_TYPE_MASK_FILE_LAYOUT     3
125 #define RCA4_TYPE_MASK_BLK_LAYOUT      4
126 #define RCA4_TYPE_MASK_OBJ_LAYOUT_MIN  8
127 #define RCA4_TYPE_MASK_OBJ_LAYOUT_MAX  9
128 #define RCA4_TYPE_MASK_OTHER_LAYOUT_MIN 12
129 #define RCA4_TYPE_MASK_OTHER_LAYOUT_MAX 15
130 #define RCA4_TYPE_MASK_ALL 0xf31f
131 
132 struct cb_recallanyargs {
133         uint32_t        craa_objs_to_keep;
134         uint32_t        craa_type_mask;
135 };
136 
137 extern __be32 nfs4_callback_recallany(struct cb_recallanyargs *args,
138                                         void *dummy,
139                                         struct cb_process_state *cps);
140 
141 struct cb_recallslotargs {
142         uint32_t        crsa_target_highest_slotid;
143 };
144 extern __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args,
145                                          void *dummy,
146                                          struct cb_process_state *cps);
147 
148 struct cb_layoutrecallargs {
149         uint32_t                cbl_recall_type;
150         uint32_t                cbl_layout_type;
151         uint32_t                cbl_layoutchanged;
152         union {
153                 struct {
154                         struct nfs_fh           cbl_fh;
155                         struct pnfs_layout_range cbl_range;
156                         nfs4_stateid            cbl_stateid;
157                 };
158                 struct nfs_fsid         cbl_fsid;
159         };
160 };
161 
162 extern __be32 nfs4_callback_layoutrecall(
163         struct cb_layoutrecallargs *args,
164         void *dummy, struct cb_process_state *cps);
165 
166 struct cb_devicenotifyitem {
167         uint32_t                cbd_notify_type;
168         uint32_t                cbd_layout_type;
169         struct nfs4_deviceid    cbd_dev_id;
170         uint32_t                cbd_immediate;
171 };
172 
173 struct cb_devicenotifyargs {
174         int                              ndevs;
175         struct cb_devicenotifyitem       *devs;
176 };
177 
178 extern __be32 nfs4_callback_devicenotify(
179         struct cb_devicenotifyargs *args,
180         void *dummy, struct cb_process_state *cps);
181 
182 struct cb_notify_lock_args {
183         struct nfs_fh                   cbnl_fh;
184         struct nfs_lowner               cbnl_owner;
185         bool                            cbnl_valid;
186 };
187 
188 extern __be32 nfs4_callback_notify_lock(struct cb_notify_lock_args *args,
189                                          void *dummy,
190                                          struct cb_process_state *cps);
191 #endif /* CONFIG_NFS_V4_1 */
192 extern int check_gss_callback_principal(struct nfs_client *, struct svc_rqst *);
193 extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args,
194                                     struct cb_getattrres *res,
195                                     struct cb_process_state *cps);
196 extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
197                                    struct cb_process_state *cps);
198 #if IS_ENABLED(CONFIG_NFS_V4)
199 extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
200 extern void nfs_callback_down(int minorversion, struct net *net);
201 #endif /* CONFIG_NFS_V4 */
202 /*
203  * nfs41: Callbacks are expected to not cause substantial latency,
204  * so we limit their concurrency to 1 by setting up the maximum number
205  * of slots for the backchannel.
206  */
207 #define NFS41_BC_MIN_CALLBACKS 1
208 #define NFS41_BC_MAX_CALLBACKS 1
209 
210 #define NFS4_MIN_NR_CALLBACK_THREADS 1
211 
212 extern unsigned int nfs_callback_set_tcpport;
213 extern unsigned short nfs_callback_nr_threads;
214 
215 #endif /* __LINUX_FS_NFS_CALLBACK_H */
216 

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