include/linux/nfs_fs_sb.h

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