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c36fca52f5
Fixes a bug where the nfs_client could be freed during callback processing. Refactor nfs_find_client to use minorversion specific means to locate the correct nfs_client structure. In the NFS layer, V4.0 clients are found using the callback_ident field in the CB_COMPOUND header. V4.1 clients are found using the sessionID in the CB_SEQUENCE operation which is also compared against the sessionID associated with the back channel thread after a successful CREATE_SESSION. Each of these methods finds the one an only nfs_client associated with the incoming callback request - so nfs_find_client_next is not needed. In the RPC layer, the pg_authenticate call needs to find the nfs_client. For the v4.0 callback service, the callback identifier has not been decoded so a search by address, version, and minorversion is used. The sessionid for the sessions based callback service has (usually) not been set for the pg_authenticate on a CB_NULL call which can be sent prior to the return of a CREATE_SESSION call, so the sessionid associated with the back channel thread is not used to find the client in pg_authenticate for CB_NULL calls. Pass the referenced nfs_client to each CB_COMPOUND operation being proceesed via the new cb_process_state structure. The reference is held across cb_compound processing. Use the new cb_process_state struct to move the NFS4ERR_RETRY_UNCACHED_REP processing from process_op into nfs4_callback_sequence where it belongs. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
168 lines
4.1 KiB
C
168 lines
4.1 KiB
C
/*
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* linux/fs/nfs/callback.h
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*
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* Copyright (C) 2004 Trond Myklebust
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*
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* NFSv4 callback definitions
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*/
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#ifndef __LINUX_FS_NFS_CALLBACK_H
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#define __LINUX_FS_NFS_CALLBACK_H
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#define NFS4_CALLBACK 0x40000000
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#define NFS4_CALLBACK_XDRSIZE 2048
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#define NFS4_CALLBACK_BUFSIZE (1024 + NFS4_CALLBACK_XDRSIZE)
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enum nfs4_callback_procnum {
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CB_NULL = 0,
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CB_COMPOUND = 1,
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};
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enum nfs4_callback_opnum {
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OP_CB_GETATTR = 3,
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OP_CB_RECALL = 4,
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/* Callback operations new to NFSv4.1 */
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OP_CB_LAYOUTRECALL = 5,
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OP_CB_NOTIFY = 6,
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OP_CB_PUSH_DELEG = 7,
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OP_CB_RECALL_ANY = 8,
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OP_CB_RECALLABLE_OBJ_AVAIL = 9,
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OP_CB_RECALL_SLOT = 10,
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OP_CB_SEQUENCE = 11,
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OP_CB_WANTS_CANCELLED = 12,
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OP_CB_NOTIFY_LOCK = 13,
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OP_CB_NOTIFY_DEVICEID = 14,
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OP_CB_ILLEGAL = 10044,
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};
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struct cb_process_state {
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__be32 drc_status;
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struct nfs_client *clp;
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struct nfs4_sessionid *svc_sid; /* v4.1 callback service sessionid */
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};
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struct cb_compound_hdr_arg {
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unsigned int taglen;
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const char *tag;
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unsigned int minorversion;
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unsigned int cb_ident; /* v4.0 callback identifier */
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unsigned nops;
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};
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struct cb_compound_hdr_res {
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__be32 *status;
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unsigned int taglen;
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const char *tag;
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__be32 *nops;
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};
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struct cb_getattrargs {
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struct sockaddr *addr;
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struct nfs_fh fh;
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uint32_t bitmap[2];
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};
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struct cb_getattrres {
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__be32 status;
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uint32_t bitmap[2];
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uint64_t size;
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uint64_t change_attr;
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struct timespec ctime;
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struct timespec mtime;
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};
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struct cb_recallargs {
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struct sockaddr *addr;
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struct nfs_fh fh;
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nfs4_stateid stateid;
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uint32_t truncate;
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};
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#if defined(CONFIG_NFS_V4_1)
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struct referring_call {
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uint32_t rc_sequenceid;
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uint32_t rc_slotid;
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};
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struct referring_call_list {
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struct nfs4_sessionid rcl_sessionid;
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uint32_t rcl_nrefcalls;
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struct referring_call *rcl_refcalls;
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};
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struct cb_sequenceargs {
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struct sockaddr *csa_addr;
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struct nfs4_sessionid csa_sessionid;
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uint32_t csa_sequenceid;
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uint32_t csa_slotid;
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uint32_t csa_highestslotid;
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uint32_t csa_cachethis;
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uint32_t csa_nrclists;
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struct referring_call_list *csa_rclists;
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};
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struct cb_sequenceres {
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__be32 csr_status;
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struct nfs4_sessionid csr_sessionid;
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uint32_t csr_sequenceid;
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uint32_t csr_slotid;
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uint32_t csr_highestslotid;
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uint32_t csr_target_highestslotid;
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};
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extern __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
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struct cb_sequenceres *res,
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struct cb_process_state *cps);
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extern int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation,
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const nfs4_stateid *stateid);
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#define RCA4_TYPE_MASK_RDATA_DLG 0
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#define RCA4_TYPE_MASK_WDATA_DLG 1
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struct cb_recallanyargs {
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struct sockaddr *craa_addr;
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uint32_t craa_objs_to_keep;
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uint32_t craa_type_mask;
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};
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extern __be32 nfs4_callback_recallany(struct cb_recallanyargs *args,
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void *dummy,
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struct cb_process_state *cps);
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struct cb_recallslotargs {
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struct sockaddr *crsa_addr;
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uint32_t crsa_target_max_slots;
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};
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extern __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args,
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void *dummy,
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struct cb_process_state *cps);
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#endif /* CONFIG_NFS_V4_1 */
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extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args,
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struct cb_getattrres *res,
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struct cb_process_state *cps);
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extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
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struct cb_process_state *cps);
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#ifdef CONFIG_NFS_V4
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extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt);
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extern void nfs_callback_down(int minorversion);
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extern int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation,
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const nfs4_stateid *stateid);
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extern int nfs4_set_callback_sessionid(struct nfs_client *clp);
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#endif /* CONFIG_NFS_V4 */
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/*
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* nfs41: Callbacks are expected to not cause substantial latency,
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* so we limit their concurrency to 1 by setting up the maximum number
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* of slots for the backchannel.
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*/
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#define NFS41_BC_MIN_CALLBACKS 1
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#define NFS41_BC_MAX_CALLBACKS 1
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extern unsigned int nfs_callback_set_tcpport;
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extern unsigned short nfs_callback_tcpport;
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extern unsigned short nfs_callback_tcpport6;
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#endif /* __LINUX_FS_NFS_CALLBACK_H */
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