LXR linux/include/linux/nfs_fs

   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/wait.h>
   7
   8#include <asm/atomic.h>
   9
  10struct nfs_iostats;
  11struct nlm_host;
  12
  13/*
  14 * The nfs_client identifies our client state to the server.
  15 */
  16struct nfs_client {
  17        atomic_t                cl_count;
  18        int                     cl_cons_state;  /* current construction state (-ve: init error) */
  19#define NFS_CS_READY            0               /* ready to be used */
  20#define NFS_CS_INITING          1               /* busy initialising */
  21        unsigned long           cl_res_state;   /* NFS resources state */
  22#define NFS_CS_CALLBACK         1               /* - callback started */
  23#define NFS_CS_IDMAP            2               /* - idmap started */
  24#define NFS_CS_RENEWD           3               /* - renewd started */
  25        struct sockaddr_storage cl_addr;        /* server identifier */
  26        size_t                  cl_addrlen;
  27        char *                  cl_hostname;    /* hostname of server */
  28        struct list_head        cl_share_link;  /* link in global client list */
  29        struct list_head        cl_superblocks; /* List of nfs_server structs */
  30
  31        struct rpc_clnt *       cl_rpcclient;
  32        const struct nfs_rpc_ops *rpc_ops;      /* NFS protocol vector */
  33        int                     cl_proto;       /* Network transport protocol */
  34
  35#ifdef CONFIG_NFS_V4
  36        u64                     cl_clientid;    /* constant */
  37        nfs4_verifier           cl_confirm;
  38        unsigned long           cl_state;
  39
  40        struct rb_root          cl_openowner_id;
  41        struct rb_root          cl_lockowner_id;
  42
  43        /*
  44         * The following rwsem ensures exclusive access to the server
  45         * while we recover the state following a lease expiration.
  46         */
  47        struct rw_semaphore     cl_sem;
  48
  49        struct list_head        cl_delegations;
  50        struct rb_root          cl_state_owners;
  51        spinlock_t              cl_lock;
  52
  53        unsigned long           cl_lease_time;
  54        unsigned long           cl_last_renewal;
  55        struct delayed_work     cl_renewd;
  56
  57        struct rpc_wait_queue   cl_rpcwaitq;
  58
  59        /* used for the setclientid verifier */
  60        struct timespec         cl_boot_time;
  61
  62        /* idmapper */
  63        struct idmap *          cl_idmap;
  64
  65        /* Our own IP address, as a null-terminated string.
  66         * This is used to generate the clientid, and the callback address.
  67         */
  68        char                    cl_ipaddr[48];
  69        unsigned char           cl_id_uniquifier;
  70#endif
  71};
  72
  73/*
  74 * NFS client parameters stored in the superblock.
  75 */
  76struct nfs_server {
  77        struct nfs_client *     nfs_client;     /* shared client and NFS4 state */
  78        struct list_head        client_link;    /* List of other nfs_server structs
  79                                                 * that share the same client
  80                                                 */
  81        struct list_head        master_link;    /* link in master servers list */
  82        struct rpc_clnt *       client;         /* RPC client handle */
  83        struct rpc_clnt *       client_acl;     /* ACL RPC client handle */
  84        struct nlm_host         *nlm_host;      /* NLM client handle */
  85        struct nfs_iostats *    io_stats;       /* I/O statistics */
  86        struct backing_dev_info backing_dev_info;
  87        atomic_long_t           writeback;      /* number of writeback pages */
  88        int                     flags;          /* various flags */
  89        unsigned int            caps;           /* server capabilities */
  90        unsigned int            rsize;          /* read size */
  91        unsigned int            rpages;         /* read size (in pages) */
  92        unsigned int            wsize;          /* write size */
  93        unsigned int            wpages;         /* write size (in pages) */
  94        unsigned int            wtmult;         /* server disk block size */
  95        unsigned int            dtsize;         /* readdir size */
  96        unsigned int            bsize;          /* server block size */
  97        unsigned int            acregmin;       /* attr cache timeouts */
  98        unsigned int            acregmax;
  99        unsigned int            acdirmin;
 100        unsigned int            acdirmax;
 101        unsigned int            namelen;
 102
 103        struct nfs_fsid         fsid;
 104        __u64                   maxfilesize;    /* maximum file size */
 105        unsigned long           mount_time;     /* when this fs was mounted */
 106        dev_t                   s_dev;          /* superblock dev numbers */
 107
 108#ifdef CONFIG_NFS_V4
 109        u32                     attr_bitmask[2];/* V4 bitmask representing the set
 110                                                   of attributes supported on this
 111                                                   filesystem */
 112        u32                     acl_bitmask;    /* V4 bitmask representing the ACEs
 113                                                   that are supported on this
 114                                                   filesystem */
 115#endif
 116        void (*destroy)(struct nfs_server *);
 117
 118        atomic_t active; /* Keep trace of any activity to this server */
 119        wait_queue_head_t active_wq;  /* Wait for any activity to stop  */
 120};
 121
 122/* Server capabilities */
 123#define NFS_CAP_READDIRPLUS     (1U << 0)
 124#define NFS_CAP_HARDLINKS       (1U << 1)
 125#define NFS_CAP_SYMLINKS        (1U << 2)
 126#define NFS_CAP_ACLS            (1U << 3)
 127#define NFS_CAP_ATOMIC_OPEN     (1U << 4)
 128
 129#endif
 130