WebSVN - shark - Blame - Rev 1618 - /shark/branches/xen/drivers/linuxc26/include/linux/nfsd/state.h

Rev	Author	Line No.	Line
423	giacomo	1	/*
		2	* linux/include/nfsd/state.h
		3	*
		4	* Copyright (c) 2001 The Regents of the University of Michigan.
		5	* All rights reserved.
		6	*
		7	* Kendrick Smith <kmsmith@umich.edu>
		8	* Andy Adamson <andros@umich.edu>
		9	*
		10	* Redistribution and use in source and binary forms, with or without
		11	* modification, are permitted provided that the following conditions
		12	* are met:
		13	*
		14	* 1. Redistributions of source code must retain the above copyright
		15	* notice, this list of conditions and the following disclaimer.
		16	* 2. Redistributions in binary form must reproduce the above copyright
		17	* notice, this list of conditions and the following disclaimer in the
		18	* documentation and/or other materials provided with the distribution.
		19	* 3. Neither the name of the University nor the names of its
		20	* contributors may be used to endorse or promote products derived
		21	* from this software without specific prior written permission.
		22	*
		23	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
		24	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
		25	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
		26	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
		27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
		28	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
		29	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
		30	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
		31	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
		32	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
		33	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		34	*
		35	*/
		36
		37	#ifndef _NFSD4_STATE_H
		38	#define _NFSD4_STATE_H
		39
		40	#include <linux/list.h>
		41
		42	#define NFS4_OPAQUE_LIMIT 1024
		43	typedef struct {
		44	u32 cl_boot;
		45	u32 cl_id;
		46	} clientid_t;
		47
		48	typedef struct {
		49	u32 so_boot;
		50	u32 so_stateownerid;
		51	u32 so_fileid;
		52	} stateid_opaque_t;
		53
		54	typedef struct {
		55	u32 si_generation;
		56	stateid_opaque_t si_opaque;
		57	} stateid_t;
		58	#define si_boot si_opaque.so_boot
		59	#define si_stateownerid si_opaque.so_stateownerid
		60	#define si_fileid si_opaque.so_fileid
		61
		62	extern stateid_t zerostateid;
		63	extern stateid_t onestateid;
		64
		65	#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
		66	#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
		67
		68	/*
		69	* struct nfs4_client - one per client. Clientids live here.
		70	* o Each nfs4_client is hashed by clientid.
		71	*
		72	* o Each nfs4_clients is also hashed by name
		73	* (the opaque quantity initially sent by the client to identify itself).
		74	*
		75	* o cl_perclient list is used to ensure no dangling stateowner references
		76	* when we expire the nfs4_client
		77	*/
		78	struct nfs4_client {
		79	struct list_head cl_idhash; /* hash by cl_clientid.id */
		80	struct list_head cl_strhash; /* hash by cl_name */
		81	struct list_head cl_perclient; /* list: stateowners */
		82	struct list_head cl_lru; /* tail queue */
		83	struct xdr_netobj cl_name; /* id generated by client */
		84	nfs4_verifier cl_verifier; /* generated by client */
		85	time_t cl_time; /* time of last lease renewal */
		86	u32 cl_addr; /* client ipaddress */
		87	struct svc_cred cl_cred; /* setclientid principal */
		88	clientid_t cl_clientid; /* generated by server */
		89	nfs4_verifier cl_confirm; /* generated by server */
		90	};
		91
		92	static inline void
		93	update_stateid(stateid_t *stateid)
		94	{
		95	stateid->si_generation++;
		96	}
		97
		98	/* A reasonable value for REPLAY_ISIZE was estimated as follows:
		99	* The OPEN response, typically the largest, requires
		100	* 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) +
		101	* 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
		102	* 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
		103	*/
		104
		105	#define NFSD4_REPLAY_ISIZE 112
		106
		107	/*
		108	* Replay buffer, where the result of the last seqid-mutating operation
		109	* is cached.
		110	*/
		111	struct nfs4_replay {
		112	u32 rp_status;
		113	unsigned int rp_buflen;
		114	char *rp_buf;
		115	unsigned intrp_allocated;
		116	char rp_ibuf[NFSD4_REPLAY_ISIZE];
		117	};
		118
		119	/*
		120	* nfs4_stateowner can either be an open_owner, or a lock_owner
		121	*
		122	* so_idhash: stateid_hashtbl[] for open owner, lockstateid_hashtbl[]
		123	* for lock_owner
		124	* so_strhash: ownerstr_hashtbl[] for open_owner, lock_ownerstr_hashtbl[]
		125	* for lock_owner
		126	* so_perclient: nfs4_client->cl_perclient entry - used when nfs4_client
		127	* struct is reaped.
		128	* so_perfilestate: heads the list of nfs4_stateid (either open or lock)
		129	* and is used to ensure no dangling nfs4_stateid references when we
		130	* release a stateowner.
		131	*/
		132	struct nfs4_stateowner {
		133	struct list_head so_idhash; /* hash by so_id */
		134	struct list_head so_strhash; /* hash by op_name */
		135	struct list_head so_perclient; /* nfs4_client->cl_perclient */
		136	struct list_head so_perfilestate; /* list: nfs4_stateid */
		137	int so_is_open_owner; /* 1=openowner,0=lockowner */
		138	u32 so_id;
		139	struct nfs4_client * so_client;
		140	u32 so_seqid;
		141	struct xdr_netobj so_owner; /* open owner name */
		142	int so_confirmed; /* successful OPEN_CONFIRM? */
		143	struct nfs4_replay so_replay;
		144	};
		145
		146	/*
		147	* nfs4_file: a file opened by some number of (open) nfs4_stateowners.
		148	* o fi_perfile list is used to search for conflicting
		149	* share_acces, share_deny on the file.
		150	*/
		151	struct nfs4_file {
		152	struct list_head fi_hash; /* hash by "struct inode " /
		153	struct list_head fi_perfile; /* list: nfs4_stateid */
		154	struct inode *fi_inode;
		155	u32 fi_id; /* used with stateowner->so_id
		156	* for stateid_hashtbl hash */
		157	};
		158
		159	/*
		160	* nfs4_stateid can either be an open stateid or (eventually) a lock stateid
		161	*
		162	* (open)nfs4_stateid: one per (open)nfs4_stateowner, nfs4_file
		163	*
		164	* st_hash: stateid_hashtbl[] entry or lockstateid_hashtbl entry
		165	* st_perfile: file_hashtbl[] entry.
		166	* st_perfile_state: nfs4_stateowner->so_perfilestate
		167	* st_share_access: used only for open stateid
		168	* st_share_deny: used only for open stateid
		169	*/
		170
		171	struct nfs4_stateid {
		172	struct list_head st_hash;
		173	struct list_head st_perfile;
		174	struct list_head st_perfilestate;
		175	struct nfs4_stateowner * st_stateowner;
		176	struct nfs4_file * st_file;
		177	stateid_t st_stateid;
		178	struct file st_vfs_file;
		179	int st_vfs_set;
		180	unsigned int st_share_access;
		181	unsigned int st_share_deny;
		182	};
		183
		184	/* flags for preprocess_seqid_op() */
		185	#define CHECK_FH 0x00000001
		186	#define CONFIRM 0x00000002
		187	#define OPEN_STATE 0x00000004
		188	#define LOCK_STATE 0x00000008
		189	#define RDWR_STATE 0x00000010
		190
		191	#define seqid_mutating_err(err) \
		192	(((err) != nfserr_stale_clientid) && \
		193	((err) != nfserr_bad_seqid) && \
		194	((err) != nfserr_stale_stateid) && \
		195	((err) != nfserr_bad_stateid))
		196
		197	extern time_t nfs4_laundromat(void);
		198	extern int nfsd4_renew(clientid_t *clid);
		199	extern int nfs4_preprocess_stateid_op(struct svc_fh *current_fh,
		200	stateid_t stateid, int flags, struct nfs4_stateid *stpp);
		201	extern int nfs4_share_conflict(struct svc_fh *current_fh,
		202	unsigned int deny_type);
		203	extern void nfs4_lock_state(void);
		204	extern void nfs4_unlock_state(void);
		205	#endif /* NFSD4_STATE_H */

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