include/linux/nfsd/state.h

   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 /*
  99 * nfs4_stateowner can either be an open_owner, or (eventually) a lock_owner
 100 *
 101 *    o so_peropenstate list is used to ensure no dangling nfs4_stateid
 102 *              reverences when we release a stateowner.
 103 */
 104 struct nfs4_stateowner {
 105         struct list_head        so_idhash;   /* hash by so_id */
 106         struct list_head        so_strhash;   /* hash by op_name */
 107         struct list_head        so_perclient; /* nfs4_client->cl_perclient */
 108         struct list_head        so_peropenstate; /* list: nfs4_stateid */
 109         u32                     so_id;
 110         struct nfs4_client *    so_client;
 111         u32                     so_seqid;
 112         struct xdr_netobj       so_owner;     /* open owner name */
 113         int                     so_confirmed; /* successful OPEN_CONFIRM? */
 114 };
 115
 116 typedef struct {
 117         u32                     dev; /* super_block->s_dev */
 118         unsigned long           ino;
 119         u32                     generation;
 120 } nfs4_ino_desc_t;
 121
 122 /*
 123 *  nfs4_file: a file opened by some number of (open) nfs4_stateowners.
 124 *    o fi_perfile list is used to search for conflicting
 125 *      share_acces, share_deny on the file.
 126 */
 127 struct nfs4_file {
 128         struct list_head        fi_hash;    /* hash by nfs4_ino_desc_t fields */
 129         struct list_head        fi_perfile; /* list: nfs4_stateid */
 130         nfs4_ino_desc_t         fi_ino;
 131         u32                     fi_id;      /* used with stateowner->so_id
 132                                              * for openstateid_hashtbl hash */
 133 };
 134
 135 /*
 136 * nfs4_stateid can either be an open stateid or (eventually) a lock stateid
 137 *
 138 * (open)nfs4_stateid: one per (open)nfs4_stateowner, nfs4_file
 139 */
 140
 141 struct nfs4_stateid {
 142         struct list_head              st_hash; /* openstateid_hashtbl[]*/
 143         struct list_head              st_perfile; /* file_hashtbl[]*/
 144         struct list_head              st_peropenstate; /* nfs4_stateowner->so_peropenstate */
 145         struct nfs4_stateowner      * st_stateowner;
 146         struct nfs4_file            * st_file;
 147         stateid_t                     st_stateid;
 148         struct file                   st_vfs_file;
 149         int                           st_vfs_set;
 150         unsigned int                  st_share_access;
 151         unsigned int                  st_share_deny;
 152 };
 153
 154 /* flags for preprocess_seqid_op() */
 155 #define CHECK_FH                0x00000001
 156 #define CONFIRM                 0x00000002
 157
 158 #define seqid_mutating_err(err)                       \
 159         (((err) != nfserr_stale_clientid) &&    \
 160         ((err) != nfserr_bad_seqid) &&          \
 161         ((err) != nfserr_stale_stateid) &&      \
 162         ((err) != nfserr_bad_stateid))
 163
 164 extern time_t nfs4_laundromat(void);
 165 extern int nfsd4_renew(clientid_t *clid);
 166 extern int nfs4_preprocess_stateid_op(struct svc_fh *current_fh,
 167                 stateid_t *stateid, int flags, struct nfs4_stateid **stpp);
 168 extern int nfs4_share_conflict(struct svc_fh *current_fh,
 169                 unsigned int deny_type);
 170 extern void nfsd4_lock_state(void);
 171 extern void nfsd4_unlock_state(void);
 172 #endif   /* NFSD4_STATE_H */