nfs3proc.c

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/*
 *  linux/fs/nfs/nfs3proc.c
 *
 *  Client-side NFSv3 procedures stubs.
 *
 *  Copyright (C) 1997, Olaf Kirch
 */

#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/sunrpc/clnt.h>
#include <linux/slab.h>
#include <linux/nfs.h>
#include <linux/nfs3.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
#include <linux/lockd/bind.h>
#include <linux/nfs_mount.h>
#include <linux/freezer.h>

#include "iostat.h"
#include "internal.h"

#define NFSDBG_FACILITY     NFSDBG_PROC

/* A wrapper to handle the EJUKEBOX and EKEYEXPIRED error messages */
static int
nfs3_rpc_wrapper(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
{
    int res;
    do {
        res = rpc_call_sync(clnt, msg, flags);
        if (res != -EJUKEBOX && res != -EKEYEXPIRED)
            break;
        freezable_schedule_timeout_killable(NFS_JUKEBOX_RETRY_TIME);
        res = -ERESTARTSYS;
    } while (!fatal_signal_pending(current));
    return res;
}

#define rpc_call_sync(clnt, msg, flags) nfs3_rpc_wrapper(clnt, msg, flags)

static int
nfs3_async_handle_jukebox(struct rpc_task *task, struct inode *inode)
{
    if (task->tk_status != -EJUKEBOX && task->tk_status != -EKEYEXPIRED)
        return 0;
    if (task->tk_status == -EJUKEBOX)
        nfs_inc_stats(inode, NFSIOS_DELAY);
    task->tk_status = 0;
    rpc_restart_call(task);
    rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
    return 1;
}

static int
do_proc_get_root(struct rpc_clnt *client, struct nfs_fh *fhandle,
         struct nfs_fsinfo *info)
{
    struct rpc_message msg = {
        .rpc_proc   = &nfs3_procedures[NFS3PROC_FSINFO],
        .rpc_argp   = fhandle,
        .rpc_resp   = info,
    };
    int status;

    dprintk("%s: call  fsinfo\n", __func__);
    nfs_fattr_init(info->fattr);
    status = rpc_call_sync(client, &msg, 0);
    dprintk("%s: reply fsinfo: %d\n", __func__, status);
    if (status == 0 && !(info->fattr->valid & NFS_ATTR_FATTR)) {
        msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
        msg.rpc_resp = info->fattr;
        status = rpc_call_sync(client, &msg, 0);
        dprintk("%s: reply getattr: %d\n", __func__, status);
    }
    return status;
}

/*
 * Bare-bones access to getattr: this is for nfs_get_root/nfs_get_sb
 */
static int
nfs3_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
           struct nfs_fsinfo *info)
{
    int status;

    status = do_proc_get_root(server->client, fhandle, info);
    if (status && server->nfs_client->cl_rpcclient != server->client)
        status = do_proc_get_root(server->nfs_client->cl_rpcclient, fhandle, info);
    return status;
}

/*
 * One function for each procedure in the NFS protocol.
 */
static int
nfs3_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
        struct nfs_fattr *fattr)
{
    struct rpc_message msg = {
        .rpc_proc   = &nfs3_procedures[NFS3PROC_GETATTR],
        .rpc_argp   = fhandle,
        .rpc_resp   = fattr,
    };
    int status;

    dprintk("NFS call  getattr\n");
    nfs_fattr_init(fattr);
    status = rpc_call_sync(server->client, &msg, 0);
    dprintk("NFS reply getattr: %d\n", status);
    return status;
}

static int
nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
            struct iattr *sattr)
{
    struct inode *inode = dentry->d_inode;
    struct nfs3_sattrargs   arg = {
        .fh     = NFS_FH(inode),
        .sattr      = sattr,
    };
    struct rpc_message msg = {
        .rpc_proc   = &nfs3_procedures[NFS3PROC_SETATTR],
        .rpc_argp   = &arg,
        .rpc_resp   = fattr,
    };
    int status;

    dprintk("NFS call  setattr\n");
    if (sattr->ia_valid & ATTR_FILE)
        msg.rpc_cred = nfs_file_cred(sattr->ia_file);
    nfs_fattr_init(fattr);
    status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
    if (status == 0)
        nfs_setattr_update_inode(inode, sattr);
    dprintk("NFS reply setattr: %d\n", status);
    return status;
}

static int
nfs3_proc_lookup(struct inode *dir, struct qstr *name,
         struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
    struct nfs3_diropargs   arg = {
        .fh     = NFS_FH(dir),
        .name       = name->name,
        .len        = name->len
    };
    struct nfs3_diropres    res = {
        .fh     = fhandle,
        .fattr      = fattr
    };
    struct rpc_message msg = {
        .rpc_proc   = &nfs3_procedures[NFS3PROC_LOOKUP],
        .rpc_argp   = &arg,
        .rpc_resp   = &res,
    };
    int         status;

    dprintk("NFS call  lookup %s\n", name->name);
    res.dir_attr = nfs_alloc_fattr();
    if (res.dir_attr == NULL)
        return -ENOMEM;

    nfs_fattr_init(fattr);
    status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
    nfs_refresh_inode(dir, res.dir_attr);
    if (status >= 0 && !(fattr->valid & NFS_ATTR_FATTR)) {
        msg.rpc_proc = &nfs3_procedures[NFS3PROC_GETATTR];
        msg.rpc_argp = fhandle;
        msg.rpc_resp = fattr;
        status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
    }
    nfs_free_fattr(res.dir_attr);
    dprintk("NFS reply lookup: %d\n", status);
    return status;
}

static int nfs3_proc_access(struct inode *inode, struct nfs_access_entry *entry)
{
    struct nfs3_accessargs  arg = {
        .fh     = NFS_FH(inode),
    };
    struct nfs3_accessres   res;
    struct rpc_message msg = {
        .rpc_proc   = &nfs3_procedures[NFS3PROC_ACCESS],
        .rpc_argp   = &arg,
        .rpc_resp   = &res,
        .rpc_cred   = entry->cred,
    };
    int mode = entry->mask;
    int status = -ENOMEM;

    dprintk("NFS call  access\n");

    if (mode & MAY_READ)
        arg.access |= NFS3_ACCESS_READ;
    if (S_ISDIR(inode->i_mode)) {
        if (mode & MAY_WRITE)
            arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE;
        if (mode & MAY_EXEC)
            arg.access |= NFS3_ACCESS_LOOKUP;
    } else {
        if (mode & MAY_WRITE)
            arg.access |= NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND;
        if (mode & MAY_EXEC)
            arg.access |= NFS3_ACCESS_EXECUTE;
    }

    res.fattr = nfs_alloc_fattr();
    if (res.fattr == NULL)
        goto out;

    status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
    nfs_refresh_inode(inode, res.fattr);
    if (status == 0) {
        entry->mask = 0;
        if (res.access & NFS3_ACCESS_READ)
            entry->mask |= MAY_READ;
        if (res.access & (NFS3_ACCESS_MODIFY | NFS3_ACCESS_EXTEND | NFS3_ACCESS_DELETE))
            entry->mask |= MAY_WRITE;
        if (res.access & (NFS3_ACCESS_LOOKUP|NFS3_ACCESS_EXECUTE))
            entry->mask |= MAY_EXEC;
    }
    nfs_free_fattr(res.fattr);
out:
    dprintk("NFS reply access: %d\n", status);
    return status;
}

static int nfs3_proc_readlink(struct inode *inode, struct page *page,
        unsigned int pgbase, unsigned int pglen)
{
    struct nfs_fattr    *fattr;
    struct nfs3_readlinkargs args = {
        .fh     = NFS_FH(inode),
        .pgbase     = pgbase,
        .pglen      = pglen,
        .pages      = &page
    };
    struct rpc_message msg = {
        .rpc_proc   = &nfs3_procedures[NFS3PROC_READLINK],
        .rpc_argp   = &args,
    };
    int status = -ENOMEM;

    dprintk("NFS call  readlink\n");
    fattr = nfs_alloc_fattr();
    if (fattr == NULL)
        goto out;
    msg.rpc_resp = fattr;

    status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
    nfs_refresh_inode(inode, fattr);
    nfs_free_fattr(fattr);
out:
    dprintk("NFS reply readlink: %d\n", status);
    return status;
}

struct nfs3_createdata {
    struct rpc_message msg;
    union {
        struct nfs3_createargs create;
        struct nfs3_mkdirargs mkdir;
        struct nfs3_symlinkargs symlink;
        struct nfs3_mknodargs mknod;
    } arg;
    struct nfs3_diropres res;
    struct nfs_fh fh;
    struct nfs_fattr fattr;
    struct nfs_fattr dir_attr;
};

static struct nfs3_createdata *nfs3_alloc_createdata(void)
{
    struct nfs3_createdata *data;

    data = kzalloc(sizeof(*data), GFP_KERNEL);
    if (data != NULL) {
        data->msg.rpc_argp = &data->arg;
        data->msg.rpc_resp = &data->res;
        data->res.fh = &data->fh;
        data->res.fattr = &data->fattr;
        data->res.dir_attr = &data->dir_attr;
        nfs_fattr_init(data->res.fattr);
        nfs_fattr_init(data->res.dir_attr);
    }
    return data;
}

static int nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
{
    int status;

    status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
    nfs_post_op_update_inode(dir, data->res.dir_attr);
    if (status == 0)
        status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
    return status;
}

static void nfs3_free_createdata(struct nfs3_createdata *data)
{
    kfree(data);
}

/*
 * Create a regular file.
 */
static int
nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
         int flags)
{
    struct nfs3_createdata *data;
    umode_t mode = sattr->ia_mode;
    int status = -ENOMEM;

    dprintk("NFS call  create %s\n", dentry->d_name.name);

    data = nfs3_alloc_createdata();
    if (data == NULL)
        goto out;

    data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
    data->arg.create.fh = NFS_FH(dir);
    data->arg.create.name = dentry->d_name.name;
    data->arg.create.len = dentry->d_name.len;
    data->arg.create.sattr = sattr;

    data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
    if (flags & O_EXCL) {
        data->arg.create.createmode  = NFS3_CREATE_EXCLUSIVE;
        data->arg.create.verifier[0] = jiffies;
        data->arg.create.verifier[1] = current->pid;
    }

    sattr->ia_mode &= ~current_umask();

    for (;;) {
        status = nfs3_do_create(dir, dentry, data);

        if (status != -ENOTSUPP)
            break;
        /* If the server doesn't support the exclusive creation
         * semantics, try again with simple 'guarded' mode. */
        switch (data->arg.create.createmode) {
            case NFS3_CREATE_EXCLUSIVE:
                data->arg.create.createmode = NFS3_CREATE_GUARDED;
                break;

            case NFS3_CREATE_GUARDED:
                data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
                break;

            case NFS3_CREATE_UNCHECKED:
                goto out;
        }
        nfs_fattr_init(data->res.dir_attr);
        nfs_fattr_init(data->res.fattr);
    }

    if (status != 0)
        goto out;

    /* When we created the file with exclusive semantics, make
     * sure we set the attributes afterwards. */
    if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
        dprintk("NFS call  setattr (post-create)\n");

        if (!(sattr->ia_valid & ATTR_ATIME_SET))
            sattr->ia_valid |= ATTR_ATIME;
        if (!(sattr->ia_valid & ATTR_MTIME_SET))
            sattr->ia_valid |= ATTR_MTIME;

        /* Note: we could use a guarded setattr here, but I'm
         * not sure this buys us anything (and I'd have
         * to revamp the NFSv3 XDR code) */
        status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
        nfs_post_op_update_inode(dentry->d_inode, data->res.fattr);
        dprintk("NFS reply setattr (post-create): %d\n", status);
        if (status != 0)
            goto out;
    }
    status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
out:
    nfs3_free_createdata(data);
    dprintk("NFS reply create: %d\n", status);
    return status;
}

static int
nfs3_proc_remove(struct inode *dir, struct qstr *name)
{
    struct nfs_removeargs arg = {
        .fh = NFS_FH(dir),
        .name = *name,
    };
    struct nfs_removeres res;
    struct rpc_message msg = {
        .rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE],
        .rpc_argp = &arg,
        .rpc_resp = &res,
    };
    int status = -ENOMEM;

    dprintk("NFS call  remove %s\n", name->name);
    res.dir_attr = nfs_alloc_fattr();
    if (res.dir_attr == NULL)
        goto out;

    status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
    nfs_post_op_update_inode(dir, res.dir_attr);
    nfs_free_fattr(res.dir_attr);
out:
    dprintk("NFS reply remove: %d\n", status);
    return status;
}

static void
nfs3_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
{
    msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
}

static void nfs3_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
{
    rpc_call_start(task);
}

static int
nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
{
    struct nfs_removeres *res;
    if (nfs3_async_handle_jukebox(task, dir))
        return 0;
    res = task->tk_msg.rpc_resp;
    nfs_post_op_update_inode(dir, res->dir_attr);
    return 1;
}

static void
nfs3_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
{
    msg->rpc_proc = &nfs3_procedures[NFS3PROC_RENAME];
}

static void nfs3_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
{
    rpc_call_start(task);
}

static int
nfs3_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
              struct inode *new_dir)
{
    struct nfs_renameres *res;

    if (nfs3_async_handle_jukebox(task, old_dir))
        return 0;
    res = task->tk_msg.rpc_resp;

    nfs_post_op_update_inode(old_dir, res->old_fattr);
    nfs_post_op_update_inode(new_dir, res->new_fattr);
    return 1;
}

static int
nfs3_proc_rename(struct inode *old_dir, struct qstr *old_name,
         struct inode *new_dir, struct qstr *new_name)
{
    struct nfs_renameargs   arg = {
        .old_dir    = NFS_FH(old_dir),
        .old_name   = old_name,
        .new_dir    = NFS_FH(new_dir),
        .new_name   = new_name,
    };
    struct nfs_renameres res;
    struct rpc_message msg = {
        .rpc_proc   = &nfs3_procedures[NFS3PROC_RENAME],
        .rpc_argp   = &arg,
        .rpc_resp   = &res,
    };
    int status = -ENOMEM;

    dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);

    res.old_fattr = nfs_alloc_fattr();
    res.new_fattr = nfs_alloc_fattr();
    if (res.old_fattr == NULL || res.new_fattr == NULL)
        goto out;

    status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
    nfs_post_op_update_inode(old_dir, res.old_fattr);
    nfs_post_op_update_inode(new_dir, res.new_fattr);
out:
    nfs_free_fattr(res.old_fattr);
    nfs_free_fattr(res.new_fattr);
    dprintk("NFS reply rename: %d\n", status);
    return status;
}

static int
nfs3_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
{
    struct nfs3_linkargs    arg = {
        .fromfh     = NFS_FH(inode),
        .tofh       = NFS_FH(dir),
        .toname     = name->name,
        .tolen      = name->len
    };
    struct nfs3_linkres res;
    struct rpc_message msg = {
        .rpc_proc   = &nfs3_procedures[NFS3PROC_LINK],
        .rpc_argp   = &arg,
        .rpc_resp   = &res,
    };
    int status = -ENOMEM;

    dprintk("NFS call  link %s\n", name->name);
    res.fattr = nfs_alloc_fattr();
    res.dir_attr = nfs_alloc_fattr();
    if (res.fattr == NULL || res.dir_attr == NULL)
        goto out;

    status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
    nfs_post_op_update_inode(dir, res.dir_attr);
    nfs_post_op_update_inode(inode, res.fattr);
out:
    nfs_free_fattr(res.dir_attr);
    nfs_free_fattr(res.fattr);
    dprintk("NFS reply link: %d\n", status);
    return status;
}

static int
nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
          unsigned int len, struct iattr *sattr)
{
    struct nfs3_createdata *data;
    int status = -ENOMEM;

    if (len > NFS3_MAXPATHLEN)
        return -ENAMETOOLONG;

    dprintk("NFS call  symlink %s\n", dentry->d_name.name);

    data = nfs3_alloc_createdata();
    if (data == NULL)
        goto out;
    data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
    data->arg.symlink.fromfh = NFS_FH(dir);
    data->arg.symlink.fromname = dentry->d_name.name;
    data->arg.symlink.fromlen = dentry->d_name.len;
    data->arg.symlink.pages = &page;
    data->arg.symlink.pathlen = len;
    data->arg.symlink.sattr = sattr;

    status = nfs3_do_create(dir, dentry, data);

    nfs3_free_createdata(data);
out:
    dprintk("NFS reply symlink: %d\n", status);
    return status;
}

static int
nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
{
    struct nfs3_createdata *data;
    umode_t mode = sattr->ia_mode;
    int status = -ENOMEM;

    dprintk("NFS call  mkdir %s\n", dentry->d_name.name);

    sattr->ia_mode &= ~current_umask();

    data = nfs3_alloc_createdata();
    if (data == NULL)
        goto out;

    data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
    data->arg.mkdir.fh = NFS_FH(dir);
    data->arg.mkdir.name = dentry->d_name.name;
    data->arg.mkdir.len = dentry->d_name.len;
    data->arg.mkdir.sattr = sattr;

    status = nfs3_do_create(dir, dentry, data);
    if (status != 0)
        goto out;

    status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
out:
    nfs3_free_createdata(data);
    dprintk("NFS reply mkdir: %d\n", status);
    return status;
}

static int
nfs3_proc_rmdir(struct inode *dir, struct qstr *name)
{
    struct nfs_fattr    *dir_attr;
    struct nfs3_diropargs   arg = {
        .fh     = NFS_FH(dir),
        .name       = name->name,
        .len        = name->len
    };
    struct rpc_message msg = {
        .rpc_proc   = &nfs3_procedures[NFS3PROC_RMDIR],
        .rpc_argp   = &arg,
    };
    int status = -ENOMEM;

    dprintk("NFS call  rmdir %s\n", name->name);
    dir_attr = nfs_alloc_fattr();
    if (dir_attr == NULL)
        goto out;

    msg.rpc_resp = dir_attr;
    status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
    nfs_post_op_update_inode(dir, dir_attr);
    nfs_free_fattr(dir_attr);
out:
    dprintk("NFS reply rmdir: %d\n", status);
    return status;
}

/*
 * The READDIR implementation is somewhat hackish - we pass the user buffer
 * to the encode function, which installs it in the receive iovec.
 * The decode function itself doesn't perform any decoding, it just makes
 * sure the reply is syntactically correct.
 *
 * Also note that this implementation handles both plain readdir and
 * readdirplus.
 */
static int
nfs3_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
          u64 cookie, struct page **pages, unsigned int count, int plus)
{
    struct inode        *dir = dentry->d_inode;
    __be32          *verf = NFS_I(dir)->cookieverf;
    struct nfs3_readdirargs arg = {
        .fh     = NFS_FH(dir),
        .cookie     = cookie,
        .verf       = {verf[0], verf[1]},
        .plus       = plus,
        .count      = count,
        .pages      = pages
    };
    struct nfs3_readdirres  res = {
        .verf       = verf,
        .plus       = plus
    };
    struct rpc_message  msg = {
        .rpc_proc   = &nfs3_procedures[NFS3PROC_READDIR],
        .rpc_argp   = &arg,
        .rpc_resp   = &res,
        .rpc_cred   = cred
    };
    int status = -ENOMEM;

    if (plus)
        msg.rpc_proc = &nfs3_procedures[NFS3PROC_READDIRPLUS];

    dprintk("NFS call  readdir%s %d\n",
            plus? "plus" : "", (unsigned int) cookie);

    res.dir_attr = nfs_alloc_fattr();
    if (res.dir_attr == NULL)
        goto out;

    status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);

    nfs_invalidate_atime(dir);
    nfs_refresh_inode(dir, res.dir_attr);

    nfs_free_fattr(res.dir_attr);
out:
    dprintk("NFS reply readdir%s: %d\n",
            plus? "plus" : "", status);
    return status;
}

static int
nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
        dev_t rdev)
{
    struct nfs3_createdata *data;
    umode_t mode = sattr->ia_mode;
    int status = -ENOMEM;

    dprintk("NFS call  mknod %s %u:%u\n", dentry->d_name.name,
            MAJOR(rdev), MINOR(rdev));

    sattr->ia_mode &= ~current_umask();

    data = nfs3_alloc_createdata();
    if (data == NULL)
        goto out;

    data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
    data->arg.mknod.fh = NFS_FH(dir);
    data->arg.mknod.name = dentry->d_name.name;
    data->arg.mknod.len = dentry->d_name.len;
    data->arg.mknod.sattr = sattr;
    data->arg.mknod.rdev = rdev;

    switch (sattr->ia_mode & S_IFMT) {
    case S_IFBLK:
        data->arg.mknod.type = NF3BLK;
        break;
    case S_IFCHR:
        data->arg.mknod.type = NF3CHR;
        break;
    case S_IFIFO:
        data->arg.mknod.type = NF3FIFO;
        break;
    case S_IFSOCK:
        data->arg.mknod.type = NF3SOCK;
        break;
    default:
        status = -EINVAL;
        goto out;
    }

    status = nfs3_do_create(dir, dentry, data);
    if (status != 0)
        goto out;
    status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
out:
    nfs3_free_createdata(data);
    dprintk("NFS reply mknod: %d\n", status);
    return status;
}

static int
nfs3_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
         struct nfs_fsstat *stat)
{
    struct rpc_message msg = {
        .rpc_proc   = &nfs3_procedures[NFS3PROC_FSSTAT],
        .rpc_argp   = fhandle,
        .rpc_resp   = stat,
    };
    int status;

    dprintk("NFS call  fsstat\n");
    nfs_fattr_init(stat->fattr);
    status = rpc_call_sync(server->client, &msg, 0);
    dprintk("NFS reply fsstat: %d\n", status);
    return status;
}

static int
do_proc_fsinfo(struct rpc_clnt *client, struct nfs_fh *fhandle,
         struct nfs_fsinfo *info)
{
    struct rpc_message msg = {
        .rpc_proc   = &nfs3_procedures[NFS3PROC_FSINFO],
        .rpc_argp   = fhandle,
        .rpc_resp   = info,
    };
    int status;

    dprintk("NFS call  fsinfo\n");
    nfs_fattr_init(info->fattr);
    status = rpc_call_sync(client, &msg, 0);
    dprintk("NFS reply fsinfo: %d\n", status);
    return status;
}

/*
 * Bare-bones access to fsinfo: this is for nfs_get_root/nfs_get_sb via
 * nfs_create_server
 */
static int
nfs3_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
           struct nfs_fsinfo *info)
{
    int status;

    status = do_proc_fsinfo(server->client, fhandle, info);
    if (status && server->nfs_client->cl_rpcclient != server->client)
        status = do_proc_fsinfo(server->nfs_client->cl_rpcclient, fhandle, info);
    return status;
}

static int
nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
           struct nfs_pathconf *info)
{
    struct rpc_message msg = {
        .rpc_proc   = &nfs3_procedures[NFS3PROC_PATHCONF],
        .rpc_argp   = fhandle,
        .rpc_resp   = info,
    };
    int status;

    dprintk("NFS call  pathconf\n");
    nfs_fattr_init(info->fattr);
    status = rpc_call_sync(server->client, &msg, 0);
    dprintk("NFS reply pathconf: %d\n", status);
    return status;
}

static int nfs3_read_done(struct rpc_task *task, struct nfs_read_data *data)
{
    struct inode *inode = data->header->inode;

    if (nfs3_async_handle_jukebox(task, inode))
        return -EAGAIN;

    nfs_invalidate_atime(inode);
    nfs_refresh_inode(inode, &data->fattr);
    return 0;
}

static void nfs3_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
{
    msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
}

static void nfs3_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
{
    rpc_call_start(task);
}

static int nfs3_write_done(struct rpc_task *task, struct nfs_write_data *data)
{
    struct inode *inode = data->header->inode;

    if (nfs3_async_handle_jukebox(task, inode))
        return -EAGAIN;
    if (task->tk_status >= 0)
        nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
    return 0;
}

static void nfs3_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
{
    msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
}

static void nfs3_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
{
    rpc_call_start(task);
}

static void nfs3_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
{
    rpc_call_start(task);
}

static int nfs3_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
{
    if (nfs3_async_handle_jukebox(task, data->inode))
        return -EAGAIN;
    nfs_refresh_inode(data->inode, data->res.fattr);
    return 0;
}

static void nfs3_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
{
    msg->rpc_proc = &nfs3_procedures[NFS3PROC_COMMIT];
}

static int
nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
{
    struct inode *inode = filp->f_path.dentry->d_inode;

    return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
}

static int nfs3_have_delegation(struct inode *inode, fmode_t flags)
{
    return 0;
}

static int nfs3_return_delegation(struct inode *inode)
{
    nfs_wb_all(inode);
    return 0;
}

static const struct inode_operations nfs3_dir_inode_operations = {
    .create     = nfs_create,
    .lookup     = nfs_lookup,
    .link       = nfs_link,
    .unlink     = nfs_unlink,
    .symlink    = nfs_symlink,
    .mkdir      = nfs_mkdir,
    .rmdir      = nfs_rmdir,
    .mknod      = nfs_mknod,
    .rename     = nfs_rename,
    .permission = nfs_permission,
    .getattr    = nfs_getattr,
    .setattr    = nfs_setattr,
    .listxattr  = nfs3_listxattr,
    .getxattr   = nfs3_getxattr,
    .setxattr   = nfs3_setxattr,
    .removexattr    = nfs3_removexattr,
};

static const struct inode_operations nfs3_file_inode_operations = {
    .permission = nfs_permission,
    .getattr    = nfs_getattr,
    .setattr    = nfs_setattr,
    .listxattr  = nfs3_listxattr,
    .getxattr   = nfs3_getxattr,
    .setxattr   = nfs3_setxattr,
    .removexattr    = nfs3_removexattr,
};

const struct nfs_rpc_ops nfs_v3_clientops = {
    .version    = 3,            /* protocol version */
    .dentry_ops = &nfs_dentry_operations,
    .dir_inode_ops  = &nfs3_dir_inode_operations,
    .file_inode_ops = &nfs3_file_inode_operations,
    .file_ops   = &nfs_file_operations,
    .getroot    = nfs3_proc_get_root,
    .submount   = nfs_submount,
    .try_mount  = nfs_try_mount,
    .getattr    = nfs3_proc_getattr,
    .setattr    = nfs3_proc_setattr,
    .lookup     = nfs3_proc_lookup,
    .access     = nfs3_proc_access,
    .readlink   = nfs3_proc_readlink,
    .create     = nfs3_proc_create,
    .remove     = nfs3_proc_remove,
    .unlink_setup   = nfs3_proc_unlink_setup,
    .unlink_rpc_prepare = nfs3_proc_unlink_rpc_prepare,
    .unlink_done    = nfs3_proc_unlink_done,
    .rename     = nfs3_proc_rename,
    .rename_setup   = nfs3_proc_rename_setup,
    .rename_rpc_prepare = nfs3_proc_rename_rpc_prepare,
    .rename_done    = nfs3_proc_rename_done,
    .link       = nfs3_proc_link,
    .symlink    = nfs3_proc_symlink,
    .mkdir      = nfs3_proc_mkdir,
    .rmdir      = nfs3_proc_rmdir,
    .readdir    = nfs3_proc_readdir,
    .mknod      = nfs3_proc_mknod,
    .statfs     = nfs3_proc_statfs,
    .fsinfo     = nfs3_proc_fsinfo,
    .pathconf   = nfs3_proc_pathconf,
    .decode_dirent  = nfs3_decode_dirent,
    .read_setup = nfs3_proc_read_setup,
    .read_pageio_init = nfs_pageio_init_read,
    .read_rpc_prepare = nfs3_proc_read_rpc_prepare,
    .read_done  = nfs3_read_done,
    .write_setup    = nfs3_proc_write_setup,
    .write_pageio_init = nfs_pageio_init_write,
    .write_rpc_prepare = nfs3_proc_write_rpc_prepare,
    .write_done = nfs3_write_done,
    .commit_setup   = nfs3_proc_commit_setup,
    .commit_rpc_prepare = nfs3_proc_commit_rpc_prepare,
    .commit_done    = nfs3_commit_done,
    .lock       = nfs3_proc_lock,
    .clear_acl_cache = nfs3_forget_cached_acls,
    .close_context  = nfs_close_context,
    .have_delegation = nfs3_have_delegation,
    .return_delegation = nfs3_return_delegation,
    .alloc_client   = nfs_alloc_client,
    .init_client    = nfs_init_client,
    .free_client    = nfs_free_client,
    .create_server  = nfs3_create_server,
    .clone_server   = nfs3_clone_server,
};