root/include/linux/nfs_fs_sb.h

INCLUDED FROM

#ifndef _NFS_FS_SB
#define _NFS_FS_SB

#include <linux/list.h>
#include <linux/backing-dev.h>
#include <linux/wait.h>

#include <asm/atomic.h>

struct nfs_iostats;
struct nlm_host;

/*
 * The nfs_client identifies our client state to the server.
 */
struct nfs_client {
        atomic_t                cl_count;
        int                     cl_cons_state;  /* current construction state (-ve: init error) */
#define NFS_CS_READY            0               /* ready to be used */
#define NFS_CS_INITING          1               /* busy initialising */
        unsigned long           cl_res_state;   /* NFS resources state */
#define NFS_CS_CALLBACK         1               /* - callback started */
#define NFS_CS_IDMAP            2               /* - idmap started */
#define NFS_CS_RENEWD           3               /* - renewd started */
        struct sockaddr_storage cl_addr;        /* server identifier */
        size_t                  cl_addrlen;
        char *                  cl_hostname;    /* hostname of server */
        struct list_head        cl_share_link;  /* link in global client list */
        struct list_head        cl_superblocks; /* List of nfs_server structs */

        struct rpc_clnt *       cl_rpcclient;
        const struct nfs_rpc_ops *rpc_ops;      /* NFS protocol vector */
        int                     cl_proto;       /* Network transport protocol */

        struct rpc_cred         *cl_machine_cred;

#ifdef CONFIG_NFS_V4
        u64                     cl_clientid;    /* constant */
        nfs4_verifier           cl_confirm;
        unsigned long           cl_state;

        struct rb_root          cl_openowner_id;
        struct rb_root          cl_lockowner_id;

        /*
         * The following rwsem ensures exclusive access to the server
         * while we recover the state following a lease expiration.
         */
        struct rw_semaphore     cl_sem;

        struct list_head        cl_delegations;
        struct rb_root          cl_state_owners;
        spinlock_t              cl_lock;

        unsigned long           cl_lease_time;
        unsigned long           cl_last_renewal;
        struct delayed_work     cl_renewd;

        struct rpc_wait_queue   cl_rpcwaitq;

        /* used for the setclientid verifier */
        struct timespec         cl_boot_time;

        /* idmapper */
        struct idmap *          cl_idmap;

        /* Our own IP address, as a null-terminated string.
         * This is used to generate the clientid, and the callback address.
         */
        char                    cl_ipaddr[48];
        unsigned char           cl_id_uniquifier;
#endif
};

/*
 * NFS client parameters stored in the superblock.
 */
struct nfs_server {
        struct nfs_client *     nfs_client;     /* shared client and NFS4 state */
        struct list_head        client_link;    /* List of other nfs_server structs
                                                 * that share the same client
                                                 */
        struct list_head        master_link;    /* link in master servers list */
        struct rpc_clnt *       client;         /* RPC client handle */
        struct rpc_clnt *       client_acl;     /* ACL RPC client handle */
        struct nlm_host         *nlm_host;      /* NLM client handle */
        struct nfs_iostats *    io_stats;       /* I/O statistics */
        struct backing_dev_info backing_dev_info;
        atomic_long_t           writeback;      /* number of writeback pages */
        int                     flags;          /* various flags */
        unsigned int            caps;           /* server capabilities */
        unsigned int            rsize;          /* read size */
        unsigned int            rpages;         /* read size (in pages) */
        unsigned int            wsize;          /* write size */
        unsigned int            wpages;         /* write size (in pages) */
        unsigned int            wtmult;         /* server disk block size */
        unsigned int            dtsize;         /* readdir size */
        unsigned short          port;           /* "port=" setting */
        unsigned int            bsize;          /* server block size */
        unsigned int            acregmin;       /* attr cache timeouts */
        unsigned int            acregmax;
        unsigned int            acdirmin;
        unsigned int            acdirmax;
        unsigned int            namelen;

        struct nfs_fsid         fsid;
        __u64                   maxfilesize;    /* maximum file size */
        unsigned long           mount_time;     /* when this fs was mounted */
        dev_t                   s_dev;          /* superblock dev numbers */

#ifdef CONFIG_NFS_V4
        u32                     attr_bitmask[2];/* V4 bitmask representing the set
                                                   of attributes supported on this
                                                   filesystem */
        u32                     acl_bitmask;    /* V4 bitmask representing the ACEs
                                                   that are supported on this
                                                   filesystem */
#endif
        void (*destroy)(struct nfs_server *);

        atomic_t active; /* Keep trace of any activity to this server */
        wait_queue_head_t active_wq;  /* Wait for any activity to stop  */

        /* mountd-related mount options */
        struct sockaddr_storage mountd_address;
        size_t                  mountd_addrlen;
        u32                     mountd_version;
        unsigned short          mountd_port;
        unsigned short          mountd_protocol;
};

/* Server capabilities */
#define NFS_CAP_READDIRPLUS     (1U << 0)
#define NFS_CAP_HARDLINKS       (1U << 1)
#define NFS_CAP_SYMLINKS        (1U << 2)
#define NFS_CAP_ACLS            (1U << 3)
#define NFS_CAP_ATOMIC_OPEN     (1U << 4)

#endif