linux/include/linux/nfs_fs_sb.h
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   1#ifndef _NFS_FS_SB
   2#define _NFS_FS_SB
   3
   4#include <linux/list.h>
   5#include <linux/backing-dev.h>
   6#include <linux/idr.h>
   7#include <linux/wait.h>
   8#include <linux/nfs_xdr.h>
   9#include <linux/sunrpc/xprt.h>
  10
  11#include <linux/atomic.h>
  12
  13struct nfs4_session;
  14struct nfs_iostats;
  15struct nlm_host;
  16struct nfs4_sequence_args;
  17struct nfs4_sequence_res;
  18struct nfs_server;
  19struct nfs4_minor_version_ops;
  20struct nfs41_server_scope;
  21struct nfs41_impl_id;
  22
  23/*
  24 * The nfs_client identifies our client state to the server.
  25 */
  26struct nfs_client {
  27        atomic_t                cl_count;
  28        atomic_t                cl_mds_count;
  29        int                     cl_cons_state;  /* current construction state (-ve: init error) */
  30#define NFS_CS_READY            0               /* ready to be used */
  31#define NFS_CS_INITING          1               /* busy initialising */
  32#define NFS_CS_SESSION_INITING  2               /* busy initialising  session */
  33        unsigned long           cl_res_state;   /* NFS resources state */
  34#define NFS_CS_CALLBACK         1               /* - callback started */
  35#define NFS_CS_IDMAP            2               /* - idmap started */
  36#define NFS_CS_RENEWD           3               /* - renewd started */
  37#define NFS_CS_STOP_RENEW       4               /* no more state to renew */
  38#define NFS_CS_CHECK_LEASE_TIME 5               /* need to check lease time */
  39        unsigned long           cl_flags;       /* behavior switches */
  40#define NFS_CS_NORESVPORT       0               /* - use ephemeral src port */
  41#define NFS_CS_DISCRTRY         1               /* - disconnect on RPC retry */
  42        struct sockaddr_storage cl_addr;        /* server identifier */
  43        size_t                  cl_addrlen;
  44        char *                  cl_hostname;    /* hostname of server */
  45        struct list_head        cl_share_link;  /* link in global client list */
  46        struct list_head        cl_superblocks; /* List of nfs_server structs */
  47
  48        struct rpc_clnt *       cl_rpcclient;
  49        const struct nfs_rpc_ops *rpc_ops;      /* NFS protocol vector */
  50        int                     cl_proto;       /* Network transport protocol */
  51        struct nfs_subversion * cl_nfs_mod;     /* pointer to nfs version module */
  52
  53        u32                     cl_minorversion;/* NFSv4 minorversion */
  54        struct rpc_cred         *cl_machine_cred;
  55
  56#if IS_ENABLED(CONFIG_NFS_V4)
  57        u64                     cl_clientid;    /* constant */
  58        nfs4_verifier           cl_confirm;     /* Clientid verifier */
  59        unsigned long           cl_state;
  60
  61        spinlock_t              cl_lock;
  62
  63        unsigned long           cl_lease_time;
  64        unsigned long           cl_last_renewal;
  65        struct delayed_work     cl_renewd;
  66
  67        struct rpc_wait_queue   cl_rpcwaitq;
  68
  69        /* idmapper */
  70        struct idmap *          cl_idmap;
  71
  72        /* Our own IP address, as a null-terminated string.
  73         * This is used to generate the mv0 callback address.
  74         */
  75        char                    cl_ipaddr[48];
  76        u32                     cl_cb_ident;    /* v4.0 callback identifier */
  77        const struct nfs4_minor_version_ops *cl_mvops;
  78
  79        /* The sequence id to use for the next CREATE_SESSION */
  80        u32                     cl_seqid;
  81        /* The flags used for obtaining the clientid during EXCHANGE_ID */
  82        u32                     cl_exchange_flags;
  83        struct nfs4_session     *cl_session;    /* shared session */
  84        struct nfs41_server_owner *cl_serverowner;
  85        struct nfs41_server_scope *cl_serverscope;
  86        struct nfs41_impl_id    *cl_implid;
  87#endif /* CONFIG_NFS_V4 */
  88
  89#ifdef CONFIG_NFS_FSCACHE
  90        struct fscache_cookie   *fscache;       /* client index cache cookie */
  91#endif
  92
  93        struct net              *cl_net;
  94};
  95
  96/*
  97 * NFS client parameters stored in the superblock.
  98 */
  99struct nfs_server {
 100        struct nfs_client *     nfs_client;     /* shared client and NFS4 state */
 101        struct list_head        client_link;    /* List of other nfs_server structs
 102                                                 * that share the same client
 103                                                 */
 104        struct list_head        master_link;    /* link in master servers list */
 105        struct rpc_clnt *       client;         /* RPC client handle */
 106        struct rpc_clnt *       client_acl;     /* ACL RPC client handle */
 107        struct nlm_host         *nlm_host;      /* NLM client handle */
 108        struct nfs_iostats __percpu *io_stats;  /* I/O statistics */
 109        struct backing_dev_info backing_dev_info;
 110        atomic_long_t           writeback;      /* number of writeback pages */
 111        int                     flags;          /* various flags */
 112        unsigned int            caps;           /* server capabilities */
 113        unsigned int            rsize;          /* read size */
 114        unsigned int            rpages;         /* read size (in pages) */
 115        unsigned int            wsize;          /* write size */
 116        unsigned int            wpages;         /* write size (in pages) */
 117        unsigned int            wtmult;         /* server disk block size */
 118        unsigned int            dtsize;         /* readdir size */
 119        unsigned short          port;           /* "port=" setting */
 120        unsigned int            bsize;          /* server block size */
 121        unsigned int            acregmin;       /* attr cache timeouts */
 122        unsigned int            acregmax;
 123        unsigned int            acdirmin;
 124        unsigned int            acdirmax;
 125        unsigned int            namelen;
 126        unsigned int            options;        /* extra options enabled by mount */
 127#define NFS_OPTION_FSCACHE      0x00000001      /* - local caching enabled */
 128
 129        struct nfs_fsid         fsid;
 130        __u64                   maxfilesize;    /* maximum file size */
 131        struct timespec         time_delta;     /* smallest time granularity */
 132        unsigned long           mount_time;     /* when this fs was mounted */
 133        dev_t                   s_dev;          /* superblock dev numbers */
 134
 135#ifdef CONFIG_NFS_FSCACHE
 136        struct nfs_fscache_key  *fscache_key;   /* unique key for superblock */
 137        struct fscache_cookie   *fscache;       /* superblock cookie */
 138#endif
 139
 140        u32                     pnfs_blksize;   /* layout_blksize attr */
 141#if IS_ENABLED(CONFIG_NFS_V4)
 142        u32                     attr_bitmask[3];/* V4 bitmask representing the set
 143                                                   of attributes supported on this
 144                                                   filesystem */
 145        u32                     cache_consistency_bitmask[2];
 146                                                /* V4 bitmask representing the subset
 147                                                   of change attribute, size, ctime
 148                                                   and mtime attributes supported by
 149                                                   the server */
 150        u32                     acl_bitmask;    /* V4 bitmask representing the ACEs
 151                                                   that are supported on this
 152                                                   filesystem */
 153        u32                     fh_expire_type; /* V4 bitmask representing file
 154                                                   handle volatility type for
 155                                                   this filesystem */
 156        struct pnfs_layoutdriver_type  *pnfs_curr_ld; /* Active layout driver */
 157        struct rpc_wait_queue   roc_rpcwaitq;
 158        void                    *pnfs_ld_data;  /* per mount point data */
 159
 160        /* the following fields are protected by nfs_client->cl_lock */
 161        struct rb_root          state_owners;
 162#endif
 163        struct ida              openowner_id;
 164        struct ida              lockowner_id;
 165        struct list_head        state_owners_lru;
 166        struct list_head        layouts;
 167        struct list_head        delegations;
 168        void (*destroy)(struct nfs_server *);
 169
 170        atomic_t active; /* Keep trace of any activity to this server */
 171
 172        /* mountd-related mount options */
 173        struct sockaddr_storage mountd_address;
 174        size_t                  mountd_addrlen;
 175        u32                     mountd_version;
 176        unsigned short          mountd_port;
 177        unsigned short          mountd_protocol;
 178};
 179
 180/* Server capabilities */
 181#define NFS_CAP_READDIRPLUS     (1U << 0)
 182#define NFS_CAP_HARDLINKS       (1U << 1)
 183#define NFS_CAP_SYMLINKS        (1U << 2)
 184#define NFS_CAP_ACLS            (1U << 3)
 185#define NFS_CAP_ATOMIC_OPEN     (1U << 4)
 186#define NFS_CAP_CHANGE_ATTR     (1U << 5)
 187#define NFS_CAP_FILEID          (1U << 6)
 188#define NFS_CAP_MODE            (1U << 7)
 189#define NFS_CAP_NLINK           (1U << 8)
 190#define NFS_CAP_OWNER           (1U << 9)
 191#define NFS_CAP_OWNER_GROUP     (1U << 10)
 192#define NFS_CAP_ATIME           (1U << 11)
 193#define NFS_CAP_CTIME           (1U << 12)
 194#define NFS_CAP_MTIME           (1U << 13)
 195#define NFS_CAP_POSIX_LOCK      (1U << 14)
 196#define NFS_CAP_UIDGID_NOMAP    (1U << 15)
 197
 198
 199/* maximum number of slots to use */
 200#define NFS4_DEF_SLOT_TABLE_SIZE (16U)
 201#define NFS4_MAX_SLOT_TABLE (256U)
 202#define NFS4_NO_SLOT ((u32)-1)
 203
 204#if IS_ENABLED(CONFIG_NFS_V4)
 205
 206/* Sessions */
 207#define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long))
 208struct nfs4_slot_table {
 209        struct nfs4_slot *slots;                /* seqid per slot */
 210        unsigned long   used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */
 211        spinlock_t      slot_tbl_lock;
 212        struct rpc_wait_queue   slot_tbl_waitq; /* allocators may wait here */
 213        u32             max_slots;              /* # slots in table */
 214        u32             highest_used_slotid;    /* sent to server on each SEQ.
 215                                                 * op for dynamic resizing */
 216        u32             target_max_slots;       /* Set by CB_RECALL_SLOT as
 217                                                 * the new max_slots */
 218        struct completion complete;
 219};
 220
 221static inline int slot_idx(struct nfs4_slot_table *tbl, struct nfs4_slot *sp)
 222{
 223        return sp - tbl->slots;
 224}
 225
 226/*
 227 * Session related parameters
 228 */
 229struct nfs4_session {
 230        struct nfs4_sessionid           sess_id;
 231        u32                             flags;
 232        unsigned long                   session_state;
 233        u32                             hash_alg;
 234        u32                             ssv_len;
 235
 236        /* The fore and back channel */
 237        struct nfs4_channel_attrs       fc_attrs;
 238        struct nfs4_slot_table          fc_slot_table;
 239        struct nfs4_channel_attrs       bc_attrs;
 240        struct nfs4_slot_table          bc_slot_table;
 241        struct nfs_client               *clp;
 242};
 243
 244#endif /* CONFIG_NFS_V4 */
 245#endif
 246
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