/* * Copyright (c) 2001 The Regents of the University of Michigan. * All rights reserved. * * Kendrick Smith * Andy Adamson * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #ifndef _NFSD4_STATE_H #define _NFSD4_STATE_H #include #include #include #include "nfsfh.h" typedef struct { u32 cl_boot; u32 cl_id; } clientid_t; typedef struct { clientid_t so_clid; u32 so_id; } stateid_opaque_t; typedef struct { u32 si_generation; stateid_opaque_t si_opaque; } stateid_t; #define STATEID_FMT "(%08x/%08x/%08x/%08x)" #define STATEID_VAL(s) \ (s)->si_opaque.so_clid.cl_boot, \ (s)->si_opaque.so_clid.cl_id, \ (s)->si_opaque.so_id, \ (s)->si_generation struct nfsd4_callback { void *cb_op; struct nfs4_client *cb_clp; struct list_head cb_per_client; u32 cb_minorversion; struct rpc_message cb_msg; const struct rpc_call_ops *cb_ops; struct work_struct cb_work; bool cb_done; }; struct nfs4_stid { #define NFS4_OPEN_STID 1 #define NFS4_LOCK_STID 2 #define NFS4_DELEG_STID 4 /* For an open stateid kept around *only* to process close replays: */ #define NFS4_CLOSED_STID 8 unsigned char sc_type; stateid_t sc_stateid; struct nfs4_client *sc_client; }; struct nfs4_delegation { struct list_head dl_perfile; struct list_head dl_perclnt; struct list_head dl_recall_lru; /* delegation recalled */ atomic_t dl_count; /* ref count */ struct nfs4_file *dl_file; u32 dl_type; time_t dl_time; /* For recall: */ struct nfs4_stid dl_stid; struct knfsd_fh dl_fh; int dl_retries; struct nfsd4_callback dl_recall; }; /* client delegation callback info */ struct nfs4_cb_conn { /* SETCLIENTID info */ struct sockaddr_storage cb_addr; struct sockaddr_storage cb_saddr; size_t cb_addrlen; u32 cb_prog; /* used only in 4.0 case; per-session otherwise */ u32 cb_ident; /* minorversion 0 only */ struct svc_xprt *cb_xprt; /* minorversion 1 only */ }; static inline struct nfs4_delegation *delegstateid(struct nfs4_stid *s) { return container_of(s, struct nfs4_delegation, dl_stid); } /* Maximum number of slots per session. 160 is useful for long haul TCP */ #define NFSD_MAX_SLOTS_PER_SESSION 160 /* Maximum number of operations per session compound */ #define NFSD_MAX_OPS_PER_COMPOUND 16 /* Maximum session per slot cache size */ #define NFSD_SLOT_CACHE_SIZE 1024 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */ #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION 32 #define NFSD_MAX_MEM_PER_SESSION \ (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE) struct nfsd4_slot { bool sl_inuse; bool sl_cachethis; u16 sl_opcnt; u32 sl_seqid; __be32 sl_status; u32 sl_datalen; char sl_data[]; }; struct nfsd4_channel_attrs { u32 headerpadsz; u32 maxreq_sz; u32 maxresp_sz; u32 maxresp_cached; u32 maxops; u32 maxreqs; u32 nr_rdma_attrs; u32 rdma_attrs; }; struct nfsd4_create_session { clientid_t clientid; struct nfs4_sessionid sessionid; u32 seqid; u32 flags; struct nfsd4_channel_attrs fore_channel; struct nfsd4_channel_attrs back_channel; u32 callback_prog; u32 uid; u32 gid; }; struct nfsd4_bind_conn_to_session { struct nfs4_sessionid sessionid; u32 dir; }; /* The single slot clientid cache structure */ struct nfsd4_clid_slot { u32 sl_seqid; __be32 sl_status; struct nfsd4_create_session sl_cr_ses; }; struct nfsd4_conn { struct list_head cn_persession; struct svc_xprt *cn_xprt; struct svc_xpt_user cn_xpt_user; struct nfsd4_session *cn_session; /* CDFC4_FORE, CDFC4_BACK: */ unsigned char cn_flags; }; struct nfsd4_session { struct kref se_ref; struct list_head se_hash; /* hash by sessionid */ struct list_head se_perclnt; u32 se_flags; struct nfs4_client *se_client; struct nfs4_sessionid se_sessionid; struct nfsd4_channel_attrs se_fchannel; struct nfsd4_channel_attrs se_bchannel; struct list_head se_conns; u32 se_cb_prog; u32 se_cb_seq_nr; struct nfsd4_slot *se_slots[]; /* forward channel slots */ }; static inline void nfsd4_put_session(struct nfsd4_session *ses) { extern void free_session(struct kref *kref); kref_put(&ses->se_ref, free_session); } static inline void nfsd4_get_session(struct nfsd4_session *ses) { kref_get(&ses->se_ref); } /* formatted contents of nfs4_sessionid */ struct nfsd4_sessionid { clientid_t clientid; u32 sequence; u32 reserved; }; #define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */ /* * struct nfs4_client - one per client. Clientids live here. * o Each nfs4_client is hashed by clientid. * * o Each nfs4_clients is also hashed by name * (the opaque quantity initially sent by the client to identify itself). * * o cl_perclient list is used to ensure no dangling stateowner references * when we expire the nfs4_client */ struct nfs4_client { struct list_head cl_idhash; /* hash by cl_clientid.id */ struct list_head cl_strhash; /* hash by cl_name */ struct list_head cl_openowners; struct idr cl_stateids; /* stateid lookup */ struct list_head cl_delegations; struct list_head cl_lru; /* tail queue */ struct xdr_netobj cl_name; /* id generated by client */ char cl_recdir[HEXDIR_LEN]; /* recovery dir */ nfs4_verifier cl_verifier; /* generated by client */ time_t cl_time; /* time of last lease renewal */ struct sockaddr_storage cl_addr; /* client ipaddress */ u32 cl_flavor; /* setclientid pseudoflavor */ char *cl_principal; /* setclientid principal name */ struct svc_cred cl_cred; /* setclientid principal */ clientid_t cl_clientid; /* generated by server */ nfs4_verifier cl_confirm; /* generated by server */ u32 cl_firststate; /* recovery dir creation */ u32 cl_minorversion; /* for v4.0 and v4.1 callbacks: */ struct nfs4_cb_conn cl_cb_conn; #define NFSD4_CLIENT_CB_UPDATE 1 #define NFSD4_CLIENT_KILL 2 unsigned long cl_cb_flags; struct rpc_clnt *cl_cb_client; u32 cl_cb_ident; #define NFSD4_CB_UP 0 #define NFSD4_CB_UNKNOWN 1 #define NFSD4_CB_DOWN 2 int cl_cb_state; struct nfsd4_callback cl_cb_null; struct nfsd4_session *cl_cb_session; struct list_head cl_callbacks; /* list of in-progress callbacks */ /* for all client information that callback code might need: */ spinlock_t cl_lock; /* for nfs41 */ struct list_head cl_sessions; struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */ u32 cl_exchange_flags; /* number of rpc's in progress over an associated session: */ atomic_t cl_refcount; /* for nfs41 callbacks */ /* We currently support a single back channel with a single slot */ unsigned long cl_cb_slot_busy; struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */ /* wait here for slots */ }; static inline void mark_client_expired(struct nfs4_client *clp) { clp->cl_time = 0; } static inline bool is_client_expired(struct nfs4_client *clp) { return clp->cl_time == 0; } /* struct nfs4_client_reset * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl * upon lease reset, or from upcall to state_daemon (to read in state * from non-volitile storage) upon reboot. */ struct nfs4_client_reclaim { struct list_head cr_strhash; /* hash by cr_name */ char cr_recdir[HEXDIR_LEN]; /* recover dir */ }; static inline void update_stateid(stateid_t *stateid) { stateid->si_generation++; /* Wraparound recommendation from 3530bis-13 9.1.3.2: */ if (stateid->si_generation == 0) stateid->si_generation = 1; } /* A reasonable value for REPLAY_ISIZE was estimated as follows: * The OPEN response, typically the largest, requires * 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) + * 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) + * 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes */ #define NFSD4_REPLAY_ISIZE 112 /* * Replay buffer, where the result of the last seqid-mutating operation * is cached. */ struct nfs4_replay { __be32 rp_status; unsigned int rp_buflen; char *rp_buf; struct knfsd_fh rp_openfh; char rp_ibuf[NFSD4_REPLAY_ISIZE]; }; /* * nfs4_stateowner can either be an open_owner, or a lock_owner * * so_idhash: stateid_hashtbl[] for open owner, lockstateid_hashtbl[] * for lock_owner * so_strhash: ownerstr_hashtbl[] for open_owner, lock_ownerstr_hashtbl[] * for lock_owner * so_perclient: nfs4_client->cl_perclient entry - used when nfs4_client * struct is reaped. * so_perfilestate: heads the list of nfs4_ol_stateid (either open or lock) * and is used to ensure no dangling nfs4_ol_stateid references when we * release a stateowner. * so_perlockowner: (open) nfs4_ol_stateid->st_perlockowner entry - used when * close is called to reap associated byte-range locks * so_close_lru: (open) stateowner is placed on this list instead of being * reaped (when so_perfilestate is empty) to hold the last close replay. * reaped by laundramat thread after lease period. */ struct nfs4_stateowner { struct list_head so_strhash; /* hash by op_name */ struct list_head so_stateids; int so_is_open_owner; /* 1=openowner,0=lockowner */ struct nfs4_client * so_client; /* after increment in ENCODE_SEQID_OP_TAIL, represents the next * sequence id expected from the client: */ u32 so_seqid; struct xdr_netobj so_owner; /* open owner name */ struct nfs4_replay so_replay; }; struct nfs4_openowner { struct nfs4_stateowner oo_owner; /* must be first field */ struct list_head oo_perclient; struct list_head oo_close_lru; /* tail queue */ struct nfs4_ol_stateid *oo_last_closed_stid; time_t oo_time; /* time of placement on so_close_lru */ #define NFS4_OO_CONFIRMED 1 #define NFS4_OO_PURGE_CLOSE 2 unsigned char oo_flags; }; struct nfs4_lockowner { struct nfs4_stateowner lo_owner; /* must be first element */ struct list_head lo_perstateid; /* for lockowners only */ struct list_head lo_list; /* for temporary uses */ }; static inline struct nfs4_openowner * openowner(struct nfs4_stateowner *so) { return container_of(so, struct nfs4_openowner, oo_owner); } static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so) { return container_of(so, struct nfs4_lockowner, lo_owner); } /* * nfs4_file: a file opened by some number of (open) nfs4_stateowners. * o fi_perfile list is used to search for conflicting * share_acces, share_deny on the file. */ struct nfs4_file { atomic_t fi_ref; struct list_head fi_hash; /* hash by "struct inode *" */ struct list_head fi_stateids; struct list_head fi_delegations; /* One each for O_RDONLY, O_WRONLY, O_RDWR: */ struct file * fi_fds[3]; /* * Each open or lock stateid contributes 0-4 to the counts * below depending on which bits are set in st_access_bitmap: * 1 to fi_access[O_RDONLY] if NFS4_SHARE_ACCES_READ is set * + 1 to fi_access[O_WRONLY] if NFS4_SHARE_ACCESS_WRITE is set * + 1 to both of the above if NFS4_SHARE_ACCESS_BOTH is set. */ atomic_t fi_access[2]; struct file *fi_deleg_file; struct file_lock *fi_lease; atomic_t fi_delegees; struct inode *fi_inode; bool fi_had_conflict; }; /* XXX: for first cut may fall back on returning file that doesn't work * at all? */ static inline struct file *find_writeable_file(struct nfs4_file *f) { if (f->fi_fds[O_WRONLY]) return f->fi_fds[O_WRONLY]; return f->fi_fds[O_RDWR]; } static inline struct file *find_readable_file(struct nfs4_file *f) { if (f->fi_fds[O_RDONLY]) return f->fi_fds[O_RDONLY]; return f->fi_fds[O_RDWR]; } static inline struct file *find_any_file(struct nfs4_file *f) { if (f->fi_fds[O_RDWR]) return f->fi_fds[O_RDWR]; else if (f->fi_fds[O_WRONLY]) return f->fi_fds[O_WRONLY]; else return f->fi_fds[O_RDONLY]; } /* * nfs4_ol_stateid can either be an open stateid or (eventually) a lock stateid * * (open)nfs4_ol_stateid: one per (open)nfs4_stateowner, nfs4_file * * st_hash: stateid_hashtbl[] entry or lockstateid_hashtbl entry * st_perfile: file_hashtbl[] entry. * st_perfile_state: nfs4_stateowner->so_perfilestate * st_perlockowner: (open stateid) list of lock nfs4_stateowners * st_access_bmap: used only for open stateid * st_deny_bmap: used only for open stateid * st_openstp: open stateid lock stateid was derived from * * XXX: open stateids and lock stateids have diverged sufficiently that * we should consider defining separate structs for the two cases. */ /* "ol" stands for "Open or Lock". Better suggestions welcome. */ struct nfs4_ol_stateid { struct nfs4_stid st_stid; struct list_head st_perfile; struct list_head st_perstateowner; struct list_head st_lockowners; struct nfs4_stateowner * st_stateowner; struct nfs4_file * st_file; unsigned long st_access_bmap; unsigned long st_deny_bmap; struct nfs4_ol_stateid * st_openstp; }; static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s) { return container_of(s, struct nfs4_ol_stateid, st_stid); } /* flags for preprocess_seqid_op() */ #define RD_STATE 0x00000010 #define WR_STATE 0x00000020 struct nfsd4_compound_state; extern __be32 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate, stateid_t *stateid, int flags, struct file **filp); extern void nfs4_lock_state(void); extern void nfs4_unlock_state(void); extern int nfs4_in_grace(void); extern __be32 nfs4_check_open_reclaim(clientid_t *clid); extern void nfs4_free_openowner(struct nfs4_openowner *); extern void nfs4_free_lockowner(struct nfs4_lockowner *); extern int set_callback_cred(void); extern void nfsd4_probe_callback(struct nfs4_client *clp); extern void nfsd4_probe_callback_sync(struct nfs4_client *clp); extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *); extern void nfsd4_do_callback_rpc(struct work_struct *); extern void nfsd4_cb_recall(struct nfs4_delegation *dp); extern int nfsd4_create_callback_queue(void); extern void nfsd4_destroy_callback_queue(void); extern void nfsd4_shutdown_callback(struct nfs4_client *); extern void nfs4_put_delegation(struct nfs4_delegation *dp); extern __be32 nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname); extern void nfsd4_init_recdir(void); extern int nfsd4_recdir_load(void); extern void nfsd4_shutdown_recdir(void); extern int nfs4_client_to_reclaim(const char *name); extern int nfs4_has_reclaimed_state(const char *name, bool use_exchange_id); extern void nfsd4_recdir_purge_old(void); extern int nfsd4_create_clid_dir(struct nfs4_client *clp); extern void nfsd4_remove_clid_dir(struct nfs4_client *clp); extern void release_session_client(struct nfsd4_session *); extern __be32 nfs4_validate_stateid(struct nfs4_client *, stateid_t *); extern void nfsd4_purge_closed_stateid(struct nfs4_stateowner *); #endif /* NFSD4_STATE_H */