Root/fs/nfsd/state.h

1/*
2 * Copyright (c) 2001 The Regents of the University of Michigan.
3 * All rights reserved.
4 *
5 * Kendrick Smith <kmsmith@umich.edu>
6 * Andy Adamson <andros@umich.edu>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 */
34
35#ifndef _NFSD4_STATE_H
36#define _NFSD4_STATE_H
37
38#include <linux/sunrpc/svc_xprt.h>
39#include <linux/nfsd/nfsfh.h>
40#include "nfsfh.h"
41
42typedef struct {
43    u32 cl_boot;
44    u32 cl_id;
45} clientid_t;
46
47typedef struct {
48    u32 so_boot;
49    u32 so_stateownerid;
50    u32 so_fileid;
51} stateid_opaque_t;
52
53typedef struct {
54    u32 si_generation;
55    stateid_opaque_t si_opaque;
56} stateid_t;
57#define si_boot si_opaque.so_boot
58#define si_stateownerid si_opaque.so_stateownerid
59#define si_fileid si_opaque.so_fileid
60
61#define STATEID_FMT "(%08x/%08x/%08x/%08x)"
62#define STATEID_VAL(s) \
63    (s)->si_boot, \
64    (s)->si_stateownerid, \
65    (s)->si_fileid, \
66    (s)->si_generation
67
68struct nfsd4_callback {
69    void *cb_op;
70    struct nfs4_client *cb_clp;
71    struct list_head cb_per_client;
72    u32 cb_minorversion;
73    struct rpc_message cb_msg;
74    const struct rpc_call_ops *cb_ops;
75    struct work_struct cb_work;
76    bool cb_done;
77};
78
79struct nfs4_delegation {
80    struct list_head dl_perfile;
81    struct list_head dl_perclnt;
82    struct list_head dl_recall_lru; /* delegation recalled */
83    atomic_t dl_count; /* ref count */
84    struct nfs4_client *dl_client;
85    struct nfs4_file *dl_file;
86    u32 dl_type;
87    time_t dl_time;
88/* For recall: */
89    stateid_t dl_stateid;
90    struct knfsd_fh dl_fh;
91    int dl_retries;
92    struct nfsd4_callback dl_recall;
93};
94
95/* client delegation callback info */
96struct nfs4_cb_conn {
97    /* SETCLIENTID info */
98    struct sockaddr_storage cb_addr;
99    struct sockaddr_storage cb_saddr;
100    size_t cb_addrlen;
101    u32 cb_prog; /* used only in 4.0 case;
102                        per-session otherwise */
103    u32 cb_ident; /* minorversion 0 only */
104    struct svc_xprt *cb_xprt; /* minorversion 1 only */
105};
106
107/* Maximum number of slots per session. 160 is useful for long haul TCP */
108#define NFSD_MAX_SLOTS_PER_SESSION 160
109/* Maximum number of operations per session compound */
110#define NFSD_MAX_OPS_PER_COMPOUND 16
111/* Maximum session per slot cache size */
112#define NFSD_SLOT_CACHE_SIZE 1024
113/* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
114#define NFSD_CACHE_SIZE_SLOTS_PER_SESSION 32
115#define NFSD_MAX_MEM_PER_SESSION \
116        (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
117
118struct nfsd4_slot {
119    bool sl_inuse;
120    bool sl_cachethis;
121    u16 sl_opcnt;
122    u32 sl_seqid;
123    __be32 sl_status;
124    u32 sl_datalen;
125    char sl_data[];
126};
127
128struct nfsd4_channel_attrs {
129    u32 headerpadsz;
130    u32 maxreq_sz;
131    u32 maxresp_sz;
132    u32 maxresp_cached;
133    u32 maxops;
134    u32 maxreqs;
135    u32 nr_rdma_attrs;
136    u32 rdma_attrs;
137};
138
139struct nfsd4_create_session {
140    clientid_t clientid;
141    struct nfs4_sessionid sessionid;
142    u32 seqid;
143    u32 flags;
144    struct nfsd4_channel_attrs fore_channel;
145    struct nfsd4_channel_attrs back_channel;
146    u32 callback_prog;
147    u32 uid;
148    u32 gid;
149};
150
151struct nfsd4_bind_conn_to_session {
152    struct nfs4_sessionid sessionid;
153    u32 dir;
154};
155
156/* The single slot clientid cache structure */
157struct nfsd4_clid_slot {
158    u32 sl_seqid;
159    __be32 sl_status;
160    struct nfsd4_create_session sl_cr_ses;
161};
162
163struct nfsd4_conn {
164    struct list_head cn_persession;
165    struct svc_xprt *cn_xprt;
166    struct svc_xpt_user cn_xpt_user;
167    struct nfsd4_session *cn_session;
168/* CDFC4_FORE, CDFC4_BACK: */
169    unsigned char cn_flags;
170};
171
172struct nfsd4_session {
173    struct kref se_ref;
174    struct list_head se_hash; /* hash by sessionid */
175    struct list_head se_perclnt;
176    u32 se_flags;
177    struct nfs4_client *se_client;
178    struct nfs4_sessionid se_sessionid;
179    struct nfsd4_channel_attrs se_fchannel;
180    struct nfsd4_channel_attrs se_bchannel;
181    struct list_head se_conns;
182    u32 se_cb_prog;
183    u32 se_cb_seq_nr;
184    struct nfsd4_slot *se_slots[]; /* forward channel slots */
185};
186
187static inline void
188nfsd4_put_session(struct nfsd4_session *ses)
189{
190    extern void free_session(struct kref *kref);
191    kref_put(&ses->se_ref, free_session);
192}
193
194static inline void
195nfsd4_get_session(struct nfsd4_session *ses)
196{
197    kref_get(&ses->se_ref);
198}
199
200/* formatted contents of nfs4_sessionid */
201struct nfsd4_sessionid {
202    clientid_t clientid;
203    u32 sequence;
204    u32 reserved;
205};
206
207#define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */
208
209/*
210 * struct nfs4_client - one per client. Clientids live here.
211 * o Each nfs4_client is hashed by clientid.
212 *
213 * o Each nfs4_clients is also hashed by name
214 * (the opaque quantity initially sent by the client to identify itself).
215 *
216 * o cl_perclient list is used to ensure no dangling stateowner references
217 * when we expire the nfs4_client
218 */
219struct nfs4_client {
220    struct list_head cl_idhash; /* hash by cl_clientid.id */
221    struct list_head cl_strhash; /* hash by cl_name */
222    struct list_head cl_openowners;
223    struct list_head cl_delegations;
224    struct list_head cl_lru; /* tail queue */
225    struct xdr_netobj cl_name; /* id generated by client */
226    char cl_recdir[HEXDIR_LEN]; /* recovery dir */
227    nfs4_verifier cl_verifier; /* generated by client */
228    time_t cl_time; /* time of last lease renewal */
229    struct sockaddr_storage cl_addr; /* client ipaddress */
230    u32 cl_flavor; /* setclientid pseudoflavor */
231    char *cl_principal; /* setclientid principal name */
232    struct svc_cred cl_cred; /* setclientid principal */
233    clientid_t cl_clientid; /* generated by server */
234    nfs4_verifier cl_confirm; /* generated by server */
235    u32 cl_firststate; /* recovery dir creation */
236    u32 cl_minorversion;
237
238    /* for v4.0 and v4.1 callbacks: */
239    struct nfs4_cb_conn cl_cb_conn;
240#define NFSD4_CLIENT_CB_UPDATE 1
241#define NFSD4_CLIENT_KILL 2
242    unsigned long cl_cb_flags;
243    struct rpc_clnt *cl_cb_client;
244    u32 cl_cb_ident;
245#define NFSD4_CB_UP 0
246#define NFSD4_CB_UNKNOWN 1
247#define NFSD4_CB_DOWN 2
248    int cl_cb_state;
249    struct nfsd4_callback cl_cb_null;
250    struct nfsd4_session *cl_cb_session;
251    struct list_head cl_callbacks; /* list of in-progress callbacks */
252
253    /* for all client information that callback code might need: */
254    spinlock_t cl_lock;
255
256    /* for nfs41 */
257    struct list_head cl_sessions;
258    struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */
259    u32 cl_exchange_flags;
260    /* number of rpc's in progress over an associated session: */
261    atomic_t cl_refcount;
262
263    /* for nfs41 callbacks */
264    /* We currently support a single back channel with a single slot */
265    unsigned long cl_cb_slot_busy;
266    struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */
267                        /* wait here for slots */
268};
269
270static inline void
271mark_client_expired(struct nfs4_client *clp)
272{
273    clp->cl_time = 0;
274}
275
276static inline bool
277is_client_expired(struct nfs4_client *clp)
278{
279    return clp->cl_time == 0;
280}
281
282/* struct nfs4_client_reset
283 * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
284 * upon lease reset, or from upcall to state_daemon (to read in state
285 * from non-volitile storage) upon reboot.
286 */
287struct nfs4_client_reclaim {
288    struct list_head cr_strhash; /* hash by cr_name */
289    char cr_recdir[HEXDIR_LEN]; /* recover dir */
290};
291
292static inline void
293update_stateid(stateid_t *stateid)
294{
295    stateid->si_generation++;
296}
297
298/* A reasonable value for REPLAY_ISIZE was estimated as follows:
299 * The OPEN response, typically the largest, requires
300 * 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) +
301 * 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
302 * 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
303 */
304
305#define NFSD4_REPLAY_ISIZE 112
306
307/*
308 * Replay buffer, where the result of the last seqid-mutating operation
309 * is cached.
310 */
311struct nfs4_replay {
312    __be32 rp_status;
313    unsigned int rp_buflen;
314    char *rp_buf;
315    unsigned intrp_allocated;
316    struct knfsd_fh rp_openfh;
317    char rp_ibuf[NFSD4_REPLAY_ISIZE];
318};
319
320/*
321* nfs4_stateowner can either be an open_owner, or a lock_owner
322*
323* so_idhash: stateid_hashtbl[] for open owner, lockstateid_hashtbl[]
324* for lock_owner
325* so_strhash: ownerstr_hashtbl[] for open_owner, lock_ownerstr_hashtbl[]
326* for lock_owner
327* so_perclient: nfs4_client->cl_perclient entry - used when nfs4_client
328* struct is reaped.
329* so_perfilestate: heads the list of nfs4_stateid (either open or lock)
330* and is used to ensure no dangling nfs4_stateid references when we
331* release a stateowner.
332* so_perlockowner: (open) nfs4_stateid->st_perlockowner entry - used when
333* close is called to reap associated byte-range locks
334* so_close_lru: (open) stateowner is placed on this list instead of being
335* reaped (when so_perfilestate is empty) to hold the last close replay.
336* reaped by laundramat thread after lease period.
337*/
338struct nfs4_stateowner {
339    struct kref so_ref;
340    struct list_head so_idhash; /* hash by so_id */
341    struct list_head so_strhash; /* hash by op_name */
342    struct list_head so_perclient;
343    struct list_head so_stateids;
344    struct list_head so_perstateid; /* for lockowners only */
345    struct list_head so_close_lru; /* tail queue */
346    time_t so_time; /* time of placement on so_close_lru */
347    int so_is_open_owner; /* 1=openowner,0=lockowner */
348    u32 so_id;
349    struct nfs4_client * so_client;
350    /* after increment in ENCODE_SEQID_OP_TAIL, represents the next
351     * sequence id expected from the client: */
352    u32 so_seqid;
353    struct xdr_netobj so_owner; /* open owner name */
354    int so_confirmed; /* successful OPEN_CONFIRM? */
355    struct nfs4_replay so_replay;
356};
357
358/*
359* nfs4_file: a file opened by some number of (open) nfs4_stateowners.
360* o fi_perfile list is used to search for conflicting
361* share_acces, share_deny on the file.
362*/
363struct nfs4_file {
364    atomic_t fi_ref;
365    struct list_head fi_hash; /* hash by "struct inode *" */
366    struct list_head fi_stateids;
367    struct list_head fi_delegations;
368    /* One each for O_RDONLY, O_WRONLY, O_RDWR: */
369    struct file * fi_fds[3];
370    /*
371     * Each open or lock stateid contributes 1 to either
372     * fi_access[O_RDONLY], fi_access[O_WRONLY], or both, depending
373     * on open or lock mode:
374     */
375    atomic_t fi_access[2];
376    struct file *fi_deleg_file;
377    struct file_lock *fi_lease;
378    atomic_t fi_delegees;
379    struct inode *fi_inode;
380    u32 fi_id; /* used with stateowner->so_id
381                         * for stateid_hashtbl hash */
382    bool fi_had_conflict;
383};
384
385/* XXX: for first cut may fall back on returning file that doesn't work
386 * at all? */
387static inline struct file *find_writeable_file(struct nfs4_file *f)
388{
389    if (f->fi_fds[O_WRONLY])
390        return f->fi_fds[O_WRONLY];
391    return f->fi_fds[O_RDWR];
392}
393
394static inline struct file *find_readable_file(struct nfs4_file *f)
395{
396    if (f->fi_fds[O_RDONLY])
397        return f->fi_fds[O_RDONLY];
398    return f->fi_fds[O_RDWR];
399}
400
401static inline struct file *find_any_file(struct nfs4_file *f)
402{
403    if (f->fi_fds[O_RDWR])
404        return f->fi_fds[O_RDWR];
405    else if (f->fi_fds[O_WRONLY])
406        return f->fi_fds[O_WRONLY];
407    else
408        return f->fi_fds[O_RDONLY];
409}
410
411/*
412* nfs4_stateid can either be an open stateid or (eventually) a lock stateid
413*
414* (open)nfs4_stateid: one per (open)nfs4_stateowner, nfs4_file
415*
416* st_hash: stateid_hashtbl[] entry or lockstateid_hashtbl entry
417* st_perfile: file_hashtbl[] entry.
418* st_perfile_state: nfs4_stateowner->so_perfilestate
419* st_perlockowner: (open stateid) list of lock nfs4_stateowners
420* st_access_bmap: used only for open stateid
421* st_deny_bmap: used only for open stateid
422* st_openstp: open stateid lock stateid was derived from
423*
424* XXX: open stateids and lock stateids have diverged sufficiently that
425* we should consider defining separate structs for the two cases.
426*/
427
428struct nfs4_stateid {
429    struct list_head st_hash;
430    struct list_head st_perfile;
431    struct list_head st_perstateowner;
432    struct list_head st_lockowners;
433    struct nfs4_stateowner * st_stateowner;
434    struct nfs4_file * st_file;
435    stateid_t st_stateid;
436    unsigned long st_access_bmap;
437    unsigned long st_deny_bmap;
438    struct nfs4_stateid * st_openstp;
439};
440
441/* flags for preprocess_seqid_op() */
442#define HAS_SESSION 0x00000001
443#define CONFIRM 0x00000002
444#define OPEN_STATE 0x00000004
445#define LOCK_STATE 0x00000008
446#define RD_STATE 0x00000010
447#define WR_STATE 0x00000020
448#define CLOSE_STATE 0x00000040
449
450#define seqid_mutating_err(err) \
451    (((err) != nfserr_stale_clientid) && \
452    ((err) != nfserr_bad_seqid) && \
453    ((err) != nfserr_stale_stateid) && \
454    ((err) != nfserr_bad_stateid))
455
456struct nfsd4_compound_state;
457
458extern __be32 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
459        stateid_t *stateid, int flags, struct file **filp);
460extern void nfs4_lock_state(void);
461extern void nfs4_unlock_state(void);
462extern int nfs4_in_grace(void);
463extern __be32 nfs4_check_open_reclaim(clientid_t *clid);
464extern void nfs4_free_stateowner(struct kref *kref);
465extern int set_callback_cred(void);
466extern void nfsd4_probe_callback(struct nfs4_client *clp);
467extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
468extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
469extern void nfsd4_do_callback_rpc(struct work_struct *);
470extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
471extern int nfsd4_create_callback_queue(void);
472extern void nfsd4_destroy_callback_queue(void);
473extern void nfsd4_shutdown_callback(struct nfs4_client *);
474extern void nfs4_put_delegation(struct nfs4_delegation *dp);
475extern __be32 nfs4_make_rec_clidname(char *clidname, struct xdr_netobj *clname);
476extern void nfsd4_init_recdir(char *recdir_name);
477extern int nfsd4_recdir_load(void);
478extern void nfsd4_shutdown_recdir(void);
479extern int nfs4_client_to_reclaim(const char *name);
480extern int nfs4_has_reclaimed_state(const char *name, bool use_exchange_id);
481extern void nfsd4_recdir_purge_old(void);
482extern int nfsd4_create_clid_dir(struct nfs4_client *clp);
483extern void nfsd4_remove_clid_dir(struct nfs4_client *clp);
484extern void release_session_client(struct nfsd4_session *);
485
486static inline void
487nfs4_put_stateowner(struct nfs4_stateowner *so)
488{
489    kref_put(&so->so_ref, nfs4_free_stateowner);
490}
491
492static inline void
493nfs4_get_stateowner(struct nfs4_stateowner *so)
494{
495    kref_get(&so->so_ref);
496}
497
498#endif /* NFSD4_STATE_H */
499

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