text: /*
   *  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 <linux/xattr.h>
  
  #include "iostat.h"
  #include "internal.h"
  #include "nfs3_fs.h"
  
  #define NFSDBG_FACILITY		NFSDBG_PROC
  
  /* A wrapper to handle the EJUKEBOX 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)
  			break;
  		freezable_schedule_timeout_killable_unsafe(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)
  		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 nfs4_label *label)
  {
  	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 = d_inode(dentry);
  	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, fattr);
  	dprintk("NFS reply setattr: %d\n", status);
  	return status;
  }
  
  static int
  nfs3_proc_lookup(struct inode *dir, const struct qstr *name,
  		 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
  		 struct nfs4_label *label)
  {
  	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)
  		nfs_access_set_mask(entry, res.access);
  	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, NULL);
  	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 posix_acl *default_acl, *acl;
  	struct nfs3_createdata *data;
  	int status = -ENOMEM;
  
  	dprintk("NFS call  create %pd\n", dentry);
  
  	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] = cpu_to_be32(jiffies);
  		data->arg.create.verifier[1] = cpu_to_be32(current->pid);
  	}
  
  	status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
  	if (status)
  		goto out;
  
  	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_release_acls;
  
  	/* 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(d_inode(dentry), data->res.fattr);
  		dprintk("NFS reply setattr (post-create): %d\n", status);
  		if (status != 0)
  			goto out_release_acls;
  	}
  
  	status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
  
  out_release_acls:
  	posix_acl_release(acl);
  	posix_acl_release(default_acl);
  out:
  	nfs3_free_createdata(data);
  	dprintk("NFS reply create: %d\n", status);
  	return status;
  }
  
  static int
  nfs3_proc_remove(struct inode *dir, const 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_link(struct inode *inode, struct inode *dir, const 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 %pd\n", dentry);
  
  	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 posix_acl *default_acl, *acl;
  	struct nfs3_createdata *data;
  	int status = -ENOMEM;
  
  	dprintk("NFS call  mkdir %pd\n", dentry);
  
  	data = nfs3_alloc_createdata();
  	if (data == NULL)
  		goto out;
  
  	status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
  	if (status)
  		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_release_acls;
  
  	status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
  
  out_release_acls:
  	posix_acl_release(acl);
  	posix_acl_release(default_acl);
  out:
  	nfs3_free_createdata(data);
  	dprintk("NFS reply mkdir: %d\n", status);
  	return status;
  }
  
  static int
  nfs3_proc_rmdir(struct inode *dir, const 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, bool plus)
  {
  	struct inode		*dir = d_inode(dentry);
  	__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 posix_acl *default_acl, *acl;
  	struct nfs3_createdata *data;
  	int status = -ENOMEM;
  
  	dprintk("NFS call  mknod %pd %u:%u\n", dentry,
  			MAJOR(rdev), MINOR(rdev));
  
  	data = nfs3_alloc_createdata();
  	if (data == NULL)
  		goto out;
  
  	status = posix_acl_create(dir, &sattr->ia_mode, &default_acl, &acl);
  	if (status)
  		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_release_acls;
  
  	status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
  
  out_release_acls:
  	posix_acl_release(acl);
  	posix_acl_release(default_acl);
  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_pgio_header *hdr)
  {
  	struct inode *inode = hdr->inode;
  
  	if (hdr->pgio_done_cb != NULL)
  		return hdr->pgio_done_cb(task, hdr);
  
  	if (nfs3_async_handle_jukebox(task, inode))
  		return -EAGAIN;
  
  	nfs_invalidate_atime(inode);
  	nfs_refresh_inode(inode, &hdr->fattr);
  	return 0;
  }
  
  static void nfs3_proc_read_setup(struct nfs_pgio_header *hdr,
  				 struct rpc_message *msg)
  {
  	msg->rpc_proc = &nfs3_procedures[NFS3PROC_READ];
  }
  
  static int nfs3_proc_pgio_rpc_prepare(struct rpc_task *task,
  				      struct nfs_pgio_header *hdr)
  {
  	rpc_call_start(task);
  	return 0;
  }
  
  static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
  {
  	struct inode *inode = hdr->inode;
  
  	if (hdr->pgio_done_cb != NULL)
  		return hdr->pgio_done_cb(task, hdr);
  
  	if (nfs3_async_handle_jukebox(task, inode))
  		return -EAGAIN;
  	if (task->tk_status >= 0)
  		nfs_writeback_update_inode(hdr);
  	return 0;
  }
  
  static void nfs3_proc_write_setup(struct nfs_pgio_header *hdr,
  				  struct rpc_message *msg)
  {
  	msg->rpc_proc = &nfs3_procedures[NFS3PROC_WRITE];
  }
  
  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 (data->commit_done_cb != NULL)
  		return data->commit_done_cb(task, 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 void nfs3_nlm_alloc_call(void *data)
  {
  	struct nfs_lock_context *l_ctx = data;
  	if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
  		get_nfs_open_context(l_ctx->open_context);
  		nfs_get_lock_context(l_ctx->open_context);
  	}
  }
  
  static bool nfs3_nlm_unlock_prepare(struct rpc_task *task, void *data)
  {
  	struct nfs_lock_context *l_ctx = data;
  	if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags))
  		return nfs_async_iocounter_wait(task, l_ctx);
  	return false;
  
  }
  
  static void nfs3_nlm_release_call(void *data)
  {
  	struct nfs_lock_context *l_ctx = data;
  	struct nfs_open_context *ctx;
  	if (l_ctx && test_bit(NFS_CONTEXT_UNLOCK, &l_ctx->open_context->flags)) {
  		ctx = l_ctx->open_context;
  		nfs_put_lock_context(l_ctx);
  		put_nfs_open_context(ctx);
  	}
  }
  
  const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
  	.nlmclnt_alloc_call = nfs3_nlm_alloc_call,
  	.nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare,
  	.nlmclnt_release_call = nfs3_nlm_release_call,
  };
  
  static int
  nfs3_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
  {
  	struct inode *inode = file_inode(filp);
  	struct nfs_lock_context *l_ctx = NULL;
  	struct nfs_open_context *ctx = nfs_file_open_context(filp);
  	int status;
  
  	if (fl->fl_flags & FL_CLOSE) {
  		l_ctx = nfs_get_lock_context(ctx);
  		if (IS_ERR(l_ctx))
  			l_ctx = NULL;
  		else
  			set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
  	}
  
  	status = nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl, l_ctx);
  
  	if (l_ctx)
  		nfs_put_lock_context(l_ctx);
  
  	return status;
  }
  
  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,
  #ifdef CONFIG_NFS_V3_ACL
  	.listxattr	= nfs3_listxattr,
  	.get_acl	= nfs3_get_acl,
  	.set_acl	= nfs3_set_acl,
  #endif
  };
  
  static const struct inode_operations nfs3_file_inode_operations = {
  	.permission	= nfs_permission,
  	.getattr	= nfs_getattr,
  	.setattr	= nfs_setattr,
  #ifdef CONFIG_NFS_V3_ACL
  	.listxattr	= nfs3_listxattr,
  	.get_acl	= nfs3_get_acl,
  	.set_acl	= nfs3_set_acl,
  #endif
  };
  
  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,
  	.nlmclnt_ops	= &nlmclnt_fl_close_lock_ops,
  	.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_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,
  	.pgio_rpc_prepare = nfs3_proc_pgio_rpc_prepare,
  	.read_setup	= nfs3_proc_read_setup,
  	.read_done	= nfs3_read_done,
  	.write_setup	= nfs3_proc_write_setup,
  	.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 = forget_all_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,
  };
  