[linux.git] / fs / nfs / proc.c

/*
 *  linux/fs/nfs/proc.c
 *
 *  Copyright (C) 1992, 1993, 1994  Rick Sladkey
 *
 *  OS-independent nfs remote procedure call functions
 *
 *  Tuned by Alan Cox <[email protected]> for >3K buffers
 *  so at last we can have decent(ish) throughput off a 
 *  Sun server.
 *
 *  Coding optimized and cleaned up by Florian La Roche.
 *  Note: Error returns are optimized for NFS_OK, which isn't translated via
 *  nfs_stat_to_errno(), but happens to be already the right return code.
 *
 *  Also, the code currently doesn't check the size of the packet, when
 *  it decodes the packet.
 *
 *  Feel free to fix it and mail me the diffs if it worries you.
 *
 *  Completely rewritten to support the new RPC call interface;
 *  rewrote and moved the entire XDR stuff to xdr.c
 *  --Olaf Kirch June 1996
 *
 *  The code below initializes all auto variables explicitly, otherwise
 *  it will fail to work as a module (gcc generates a memset call for an
 *  incomplete struct).
 */

#include <linux/types.h>
#include <linux/param.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/utsname.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/pagemap.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
#include <linux/lockd/bind.h>
#include "internal.h"

#define NFSDBG_FACILITY		NFSDBG_PROC

/*
 * Bare-bones access to getattr: this is for nfs_read_super.
 */
static int
nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
		  struct nfs_fsinfo *info)
{
	struct nfs_fattr *fattr = info->fattr;
	struct nfs2_fsstat fsinfo;
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_GETATTR],
		.rpc_argp	= fhandle,
		.rpc_resp	= fattr,
	};
	int status;

	dprintk("%s: call getattr\n", __func__);
	nfs_fattr_init(fattr);
	status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
	dprintk("%s: reply getattr: %d\n", __func__, status);
	if (status)
		return status;
	dprintk("%s: call statfs\n", __func__);
	msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
	msg.rpc_resp = &fsinfo;
	status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
	dprintk("%s: reply statfs: %d\n", __func__, status);
	if (status)
		return status;
	info->rtmax  = NFS_MAXDATA;
	info->rtpref = fsinfo.tsize;
	info->rtmult = fsinfo.bsize;
	info->wtmax  = NFS_MAXDATA;
	info->wtpref = fsinfo.tsize;
	info->wtmult = fsinfo.bsize;
	info->dtpref = fsinfo.tsize;
	info->maxfilesize = 0x7FFFFFFF;
	info->lease_time = 0;
	return 0;
}

/*
 * One function for each procedure in the NFS protocol.
 */
static int
nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_fattr *fattr)
{
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_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
nfs_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
		 struct iattr *sattr)
{
	struct inode *inode = dentry->d_inode;
	struct nfs_sattrargs	arg = { 
		.fh	= NFS_FH(inode),
		.sattr	= sattr
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_SETATTR],
		.rpc_argp	= &arg,
		.rpc_resp	= fattr,
	};
	int	status;

	/* Mask out the non-modebit related stuff from attr->ia_mode */
	sattr->ia_mode &= S_IALLUGO;

	dprintk("NFS call  setattr\n");
	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
nfs_proc_lookup(struct inode *dir, struct qstr *name,
		struct nfs_fh *fhandle, struct nfs_fattr *fattr)
{
	struct nfs_diropargs	arg = {
		.fh		= NFS_FH(dir),
		.name		= name->name,
		.len		= name->len
	};
	struct nfs_diropok	res = {
		.fh		= fhandle,
		.fattr		= fattr
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_LOOKUP],
		.rpc_argp	= &arg,
		.rpc_resp	= &res,
	};
	int			status;

	dprintk("NFS call  lookup %s\n", name->name);
	nfs_fattr_init(fattr);
	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	dprintk("NFS reply lookup: %d\n", status);
	return status;
}

static int nfs_proc_readlink(struct inode *inode, struct page *page,
		unsigned int pgbase, unsigned int pglen)
{
	struct nfs_readlinkargs	args = {
		.fh		= NFS_FH(inode),
		.pgbase		= pgbase,
		.pglen		= pglen,
		.pages		= &page
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_READLINK],
		.rpc_argp	= &args,
	};
	int			status;

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

static int
nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
		int flags, struct nameidata *nd)
{
	struct nfs_fh		fhandle;
	struct nfs_fattr	fattr;
	struct nfs_createargs	arg = {
		.fh		= NFS_FH(dir),
		.name		= dentry->d_name.name,
		.len		= dentry->d_name.len,
		.sattr		= sattr
	};
	struct nfs_diropok	res = {
		.fh		= &fhandle,
		.fattr		= &fattr
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_CREATE],
		.rpc_argp	= &arg,
		.rpc_resp	= &res,
	};
	int			status;

	nfs_fattr_init(&fattr);
	dprintk("NFS call  create %s\n", dentry->d_name.name);
	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	nfs_mark_for_revalidate(dir);
	if (status == 0)
		status = nfs_instantiate(dentry, &fhandle, &fattr);
	dprintk("NFS reply create: %d\n", status);
	return status;
}

/*
 * In NFSv2, mknod is grafted onto the create call.
 */
static int
nfs_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
	       dev_t rdev)
{
	struct nfs_fh fhandle;
	struct nfs_fattr fattr;
	struct nfs_createargs	arg = {
		.fh		= NFS_FH(dir),
		.name		= dentry->d_name.name,
		.len		= dentry->d_name.len,
		.sattr		= sattr
	};
	struct nfs_diropok	res = {
		.fh		= &fhandle,
		.fattr		= &fattr
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_CREATE],
		.rpc_argp	= &arg,
		.rpc_resp	= &res,
	};
	int status, mode;

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

	mode = sattr->ia_mode;
	if (S_ISFIFO(mode)) {
		sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
		sattr->ia_valid &= ~ATTR_SIZE;
	} else if (S_ISCHR(mode) || S_ISBLK(mode)) {
		sattr->ia_valid |= ATTR_SIZE;
		sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
	}

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

	if (status == -EINVAL && S_ISFIFO(mode)) {
		sattr->ia_mode = mode;
		nfs_fattr_init(&fattr);
		status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	}
	if (status == 0)
		status = nfs_instantiate(dentry, &fhandle, &fattr);
	dprintk("NFS reply mknod: %d\n", status);
	return status;
}
  
static int
nfs_proc_remove(struct inode *dir, struct qstr *name)
{
	struct nfs_removeargs arg = {
		.fh = NFS_FH(dir),
		.name.len = name->len,
		.name.name = name->name,
	};
	struct rpc_message msg = { 
		.rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
		.rpc_argp = &arg,
	};
	int			status;

	dprintk("NFS call  remove %s\n", name->name);
	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	nfs_mark_for_revalidate(dir);

	dprintk("NFS reply remove: %d\n", status);
	return status;
}

static void
nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
{
	msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
}

static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
{
	nfs_mark_for_revalidate(dir);
	return 1;
}

static int
nfs_proc_rename(struct inode *old_dir, struct qstr *old_name,
		struct inode *new_dir, struct qstr *new_name)
{
	struct nfs_renameargs	arg = {
		.fromfh		= NFS_FH(old_dir),
		.fromname	= old_name->name,
		.fromlen	= old_name->len,
		.tofh		= NFS_FH(new_dir),
		.toname		= new_name->name,
		.tolen		= new_name->len
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_RENAME],
		.rpc_argp	= &arg,
	};
	int			status;

	dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
	status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
	nfs_mark_for_revalidate(old_dir);
	nfs_mark_for_revalidate(new_dir);
	dprintk("NFS reply rename: %d\n", status);
	return status;
}

static int
nfs_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
{
	struct nfs_linkargs	arg = {
		.fromfh		= NFS_FH(inode),
		.tofh		= NFS_FH(dir),
		.toname		= name->name,
		.tolen		= name->len
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_LINK],
		.rpc_argp	= &arg,
	};
	int			status;

	dprintk("NFS call  link %s\n", name->name);
	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
	nfs_mark_for_revalidate(inode);
	nfs_mark_for_revalidate(dir);
	dprintk("NFS reply link: %d\n", status);
	return status;
}

static int
nfs_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
		 unsigned int len, struct iattr *sattr)
{
	struct nfs_fh fhandle;
	struct nfs_fattr fattr;
	struct nfs_symlinkargs	arg = {
		.fromfh		= NFS_FH(dir),
		.fromname	= dentry->d_name.name,
		.fromlen	= dentry->d_name.len,
		.pages		= &page,
		.pathlen	= len,
		.sattr		= sattr
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_SYMLINK],
		.rpc_argp	= &arg,
	};
	int			status;

	if (len > NFS2_MAXPATHLEN)
		return -ENAMETOOLONG;

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

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

	/*
	 * V2 SYMLINK requests don't return any attributes.  Setting the
	 * filehandle size to zero indicates to nfs_instantiate that it
	 * should fill in the data with a LOOKUP call on the wire.
	 */
	if (status == 0) {
		nfs_fattr_init(&fattr);
		fhandle.size = 0;
		status = nfs_instantiate(dentry, &fhandle, &fattr);
	}

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

static int
nfs_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
{
	struct nfs_fh fhandle;
	struct nfs_fattr fattr;
	struct nfs_createargs	arg = {
		.fh		= NFS_FH(dir),
		.name		= dentry->d_name.name,
		.len		= dentry->d_name.len,
		.sattr		= sattr
	};
	struct nfs_diropok	res = {
		.fh		= &fhandle,
		.fattr		= &fattr
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_MKDIR],
		.rpc_argp	= &arg,
		.rpc_resp	= &res,
	};
	int			status;

	dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
	nfs_fattr_init(&fattr);
	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	nfs_mark_for_revalidate(dir);
	if (status == 0)
		status = nfs_instantiate(dentry, &fhandle, &fattr);
	dprintk("NFS reply mkdir: %d\n", status);
	return status;
}

static int
nfs_proc_rmdir(struct inode *dir, struct qstr *name)
{
	struct nfs_diropargs	arg = {
		.fh		= NFS_FH(dir),
		.name		= name->name,
		.len		= name->len
	};
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_RMDIR],
		.rpc_argp	= &arg,
	};
	int			status;

	dprintk("NFS call  rmdir %s\n", name->name);
	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	nfs_mark_for_revalidate(dir);
	dprintk("NFS reply rmdir: %d\n", status);
	return status;
}

/*
 * The READDIR implementation is somewhat hackish - we pass a temporary
 * buffer to the encode function, which installs it in the receive
 * the receive iovec. The decode function just parses the reply to make
 * sure it is syntactically correct; the entries itself are decoded
 * from nfs_readdir by calling the decode_entry function directly.
 */
static int
nfs_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
		 u64 cookie, struct page *page, unsigned int count, int plus)
{
	struct inode		*dir = dentry->d_inode;
	struct nfs_readdirargs	arg = {
		.fh		= NFS_FH(dir),
		.cookie		= cookie,
		.count		= count,
		.pages		= &page,
	};
	struct rpc_message	msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_READDIR],
		.rpc_argp	= &arg,
		.rpc_cred	= cred,
	};
	int			status;

	dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);

	nfs_invalidate_atime(dir);

	dprintk("NFS reply readdir: %d\n", status);
	return status;
}

static int
nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
			struct nfs_fsstat *stat)
{
	struct nfs2_fsstat fsinfo;
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_STATFS],
		.rpc_argp	= fhandle,
		.rpc_resp	= &fsinfo,
	};
	int	status;

	dprintk("NFS call  statfs\n");
	nfs_fattr_init(stat->fattr);
	status = rpc_call_sync(server->client, &msg, 0);
	dprintk("NFS reply statfs: %d\n", status);
	if (status)
		goto out;
	stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
	stat->fbytes = (u64)fsinfo.bfree  * fsinfo.bsize;
	stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
	stat->tfiles = 0;
	stat->ffiles = 0;
	stat->afiles = 0;
out:
	return status;
}

static int
nfs_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
			struct nfs_fsinfo *info)
{
	struct nfs2_fsstat fsinfo;
	struct rpc_message msg = {
		.rpc_proc	= &nfs_procedures[NFSPROC_STATFS],
		.rpc_argp	= fhandle,
		.rpc_resp	= &fsinfo,
	};
	int	status;

	dprintk("NFS call  fsinfo\n");
	nfs_fattr_init(info->fattr);
	status = rpc_call_sync(server->client, &msg, 0);
	dprintk("NFS reply fsinfo: %d\n", status);
	if (status)
		goto out;
	info->rtmax  = NFS_MAXDATA;
	info->rtpref = fsinfo.tsize;
	info->rtmult = fsinfo.bsize;
	info->wtmax  = NFS_MAXDATA;
	info->wtpref = fsinfo.tsize;
	info->wtmult = fsinfo.bsize;
	info->dtpref = fsinfo.tsize;
	info->maxfilesize = 0x7FFFFFFF;
	info->lease_time = 0;
out:
	return status;
}

static int
nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
		  struct nfs_pathconf *info)
{
	info->max_link = 0;
	info->max_namelen = NFS2_MAXNAMLEN;
	return 0;
}

static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
{
	nfs_invalidate_atime(data->inode);
	if (task->tk_status >= 0) {
		nfs_refresh_inode(data->inode, data->res.fattr);
		/* Emulate the eof flag, which isn't normally needed in NFSv2
		 * as it is guaranteed to always return the file attributes
		 */
		if (data->args.offset + data->args.count >= data->res.fattr->size)
			data->res.eof = 1;
	}
	return 0;
}

static void nfs_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
{
	msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
}

static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
{
	if (task->tk_status >= 0)
		nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
	return 0;
}

static void nfs_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
{
	/* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
	data->args.stable = NFS_FILE_SYNC;
	msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
}

static void
nfs_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
{
	BUG();
}

static int
nfs_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);
}


const struct nfs_rpc_ops nfs_v2_clientops = {
	.version	= 2,		       /* protocol version */
	.dentry_ops	= &nfs_dentry_operations,
	.dir_inode_ops	= &nfs_dir_inode_operations,
	.file_inode_ops	= &nfs_file_inode_operations,
	.getroot	= nfs_proc_get_root,
	.getattr	= nfs_proc_getattr,
	.setattr	= nfs_proc_setattr,
	.lookup		= nfs_proc_lookup,
	.access		= NULL,		       /* access */
	.readlink	= nfs_proc_readlink,
	.create		= nfs_proc_create,
	.remove		= nfs_proc_remove,
	.unlink_setup	= nfs_proc_unlink_setup,
	.unlink_done	= nfs_proc_unlink_done,
	.rename		= nfs_proc_rename,
	.link		= nfs_proc_link,
	.symlink	= nfs_proc_symlink,
	.mkdir		= nfs_proc_mkdir,
	.rmdir		= nfs_proc_rmdir,
	.readdir	= nfs_proc_readdir,
	.mknod		= nfs_proc_mknod,
	.statfs		= nfs_proc_statfs,
	.fsinfo		= nfs_proc_fsinfo,
	.pathconf	= nfs_proc_pathconf,
	.decode_dirent	= nfs_decode_dirent,
	.read_setup	= nfs_proc_read_setup,
	.read_done	= nfs_read_done,
	.write_setup	= nfs_proc_write_setup,
	.write_done	= nfs_write_done,
	.commit_setup	= nfs_proc_commit_setup,
	.file_open	= nfs_open,
	.file_release	= nfs_release,
	.lock		= nfs_proc_lock,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/nfs/proc.c
	3	*
	4	* Copyright (C) 1992, 1993, 1994 Rick Sladkey
	5	*
	6	* OS-independent nfs remote procedure call functions
	7	*
	8	* Tuned by Alan Cox <[email protected]> for >3K buffers
	9	* so at last we can have decent(ish) throughput off a
	10	* Sun server.
	11	*
	12	* Coding optimized and cleaned up by Florian La Roche.
	13	* Note: Error returns are optimized for NFS_OK, which isn't translated via
	14	* nfs_stat_to_errno(), but happens to be already the right return code.
	15	*
	16	* Also, the code currently doesn't check the size of the packet, when
	17	* it decodes the packet.
	18	*
	19	* Feel free to fix it and mail me the diffs if it worries you.
	20	*
	21	* Completely rewritten to support the new RPC call interface;
	22	* rewrote and moved the entire XDR stuff to xdr.c
	23	* --Olaf Kirch June 1996
	24	*
	25	* The code below initializes all auto variables explicitly, otherwise
	26	* it will fail to work as a module (gcc generates a memset call for an
	27	* incomplete struct).
	28	*/
	29
	30	#include <linux/types.h>
	31	#include <linux/param.h>
	32	#include <linux/slab.h>
	33	#include <linux/time.h>
	34	#include <linux/mm.h>
	35	#include <linux/utsname.h>
	36	#include <linux/errno.h>
	37	#include <linux/string.h>
	38	#include <linux/in.h>
	39	#include <linux/pagemap.h>
	40	#include <linux/sunrpc/clnt.h>
	41	#include <linux/nfs.h>
	42	#include <linux/nfs2.h>
	43	#include <linux/nfs_fs.h>
	44	#include <linux/nfs_page.h>
	45	#include <linux/lockd/bind.h>
f7b422b1	46	#include "internal.h"
1da177e4 LT	47
	48	#define NFSDBG_FACILITY NFSDBG_PROC
	49
1da177e4 LT	50	/*
	51	* Bare-bones access to getattr: this is for nfs_read_super.
	52	*/
	53	static int
	54	nfs_proc_get_root(struct nfs_server server, struct nfs_fh fhandle,
	55	struct nfs_fsinfo *info)
	56	{
	57	struct nfs_fattr *fattr = info->fattr;
	58	struct nfs2_fsstat fsinfo;
dead28da CL	59	struct rpc_message msg = {
	60	.rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
	61	.rpc_argp = fhandle,
	62	.rpc_resp = fattr,
	63	};
1da177e4 LT	64	int status;
1da177e4 LT	65
3110ff80	66	dprintk("%s: call getattr\n", __func__);
0e574af1	67	nfs_fattr_init(fattr);
5006a76c	68	status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
3110ff80	69	dprintk("%s: reply getattr: %d\n", __func__, status);
1da177e4 LT	70	if (status)
1da177e4 LT	71	return status;
3110ff80	72	dprintk("%s: call statfs\n", __func__);
dead28da CL	73	msg.rpc_proc = &nfs_procedures[NFSPROC_STATFS];
dead28da CL	74	msg.rpc_resp = &fsinfo;
5006a76c	75	status = rpc_call_sync(server->nfs_client->cl_rpcclient, &msg, 0);
3110ff80	76	dprintk("%s: reply statfs: %d\n", __func__, status);
1da177e4 LT	77	if (status)
	78	return status;
	79	info->rtmax = NFS_MAXDATA;
	80	info->rtpref = fsinfo.tsize;
	81	info->rtmult = fsinfo.bsize;
	82	info->wtmax = NFS_MAXDATA;
	83	info->wtpref = fsinfo.tsize;
	84	info->wtmult = fsinfo.bsize;
	85	info->dtpref = fsinfo.tsize;
	86	info->maxfilesize = 0x7FFFFFFF;
	87	info->lease_time = 0;
	88	return 0;
	89	}
	90
	91	/*
	92	* One function for each procedure in the NFS protocol.
	93	*/
	94	static int
	95	nfs_proc_getattr(struct nfs_server server, struct nfs_fh fhandle,
	96	struct nfs_fattr *fattr)
	97	{
dead28da CL	98	struct rpc_message msg = {
	99	.rpc_proc = &nfs_procedures[NFSPROC_GETATTR],
	100	.rpc_argp = fhandle,
	101	.rpc_resp = fattr,
	102	};
1da177e4 LT	103	int status;
	104
	105	dprintk("NFS call getattr\n");
0e574af1	106	nfs_fattr_init(fattr);
dead28da	107	status = rpc_call_sync(server->client, &msg, 0);
1da177e4 LT	108	dprintk("NFS reply getattr: %d\n", status);
	109	return status;
	110	}
	111
	112	static int
	113	nfs_proc_setattr(struct dentry dentry, struct nfs_fattr fattr,
	114	struct iattr *sattr)
	115	{
	116	struct inode *inode = dentry->d_inode;
	117	struct nfs_sattrargs arg = {
	118	.fh = NFS_FH(inode),
	119	.sattr = sattr
	120	};
dead28da CL	121	struct rpc_message msg = {
	122	.rpc_proc = &nfs_procedures[NFSPROC_SETATTR],
	123	.rpc_argp = &arg,
	124	.rpc_resp = fattr,
	125	};
1da177e4 LT	126	int status;
1da177e4 LT	127
cf3fff54 TM	128	/* Mask out the non-modebit related stuff from attr->ia_mode */
	129	sattr->ia_mode &= S_IALLUGO;
	130
1da177e4	131	dprintk("NFS call setattr\n");
0e574af1	132	nfs_fattr_init(fattr);
dead28da	133	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
65e4308d TM	134	if (status == 0)
65e4308d TM	135	nfs_setattr_update_inode(inode, sattr);
1da177e4 LT	136	dprintk("NFS reply setattr: %d\n", status);
	137	return status;
	138	}
	139
	140	static int
	141	nfs_proc_lookup(struct inode dir, struct qstr name,
	142	struct nfs_fh fhandle, struct nfs_fattr fattr)
	143	{
	144	struct nfs_diropargs arg = {
	145	.fh = NFS_FH(dir),
	146	.name = name->name,
	147	.len = name->len
	148	};
	149	struct nfs_diropok res = {
	150	.fh = fhandle,
	151	.fattr = fattr
	152	};
dead28da CL	153	struct rpc_message msg = {
	154	.rpc_proc = &nfs_procedures[NFSPROC_LOOKUP],
	155	.rpc_argp = &arg,
	156	.rpc_resp = &res,
	157	};
1da177e4 LT	158	int status;
	159
	160	dprintk("NFS call lookup %s\n", name->name);
0e574af1	161	nfs_fattr_init(fattr);
dead28da	162	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1da177e4 LT	163	dprintk("NFS reply lookup: %d\n", status);
	164	return status;
	165	}
	166
	167	static int nfs_proc_readlink(struct inode inode, struct page page,
	168	unsigned int pgbase, unsigned int pglen)
	169	{
	170	struct nfs_readlinkargs args = {
	171	.fh = NFS_FH(inode),
	172	.pgbase = pgbase,
	173	.pglen = pglen,
	174	.pages = &page
	175	};
dead28da CL	176	struct rpc_message msg = {
	177	.rpc_proc = &nfs_procedures[NFSPROC_READLINK],
	178	.rpc_argp = &args,
	179	};
1da177e4 LT	180	int status;
	181
	182	dprintk("NFS call readlink\n");
dead28da	183	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1da177e4 LT	184	dprintk("NFS reply readlink: %d\n", status);
	185	return status;
	186	}
	187
1da177e4 LT	188	static int
1da177e4 LT	189	nfs_proc_create(struct inode dir, struct dentry dentry, struct iattr *sattr,
02a913a7	190	int flags, struct nameidata *nd)
1da177e4 LT	191	{
	192	struct nfs_fh fhandle;
	193	struct nfs_fattr fattr;
	194	struct nfs_createargs arg = {
	195	.fh = NFS_FH(dir),
	196	.name = dentry->d_name.name,
	197	.len = dentry->d_name.len,
	198	.sattr = sattr
	199	};
	200	struct nfs_diropok res = {
	201	.fh = &fhandle,
	202	.fattr = &fattr
	203	};
dead28da CL	204	struct rpc_message msg = {
	205	.rpc_proc = &nfs_procedures[NFSPROC_CREATE],
	206	.rpc_argp = &arg,
	207	.rpc_resp = &res,
	208	};
1da177e4 LT	209	int status;
1da177e4 LT	210
0e574af1	211	nfs_fattr_init(&fattr);
1da177e4	212	dprintk("NFS call create %s\n", dentry->d_name.name);
dead28da	213	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
bad2a524	214	nfs_mark_for_revalidate(dir);
1da177e4 LT	215	if (status == 0)
	216	status = nfs_instantiate(dentry, &fhandle, &fattr);
	217	dprintk("NFS reply create: %d\n", status);
	218	return status;
	219	}
	220
	221	/*
	222	* In NFSv2, mknod is grafted onto the create call.
	223	*/
	224	static int
	225	nfs_proc_mknod(struct inode dir, struct dentry dentry, struct iattr *sattr,
	226	dev_t rdev)
	227	{
	228	struct nfs_fh fhandle;
	229	struct nfs_fattr fattr;
	230	struct nfs_createargs arg = {
	231	.fh = NFS_FH(dir),
	232	.name = dentry->d_name.name,
	233	.len = dentry->d_name.len,
	234	.sattr = sattr
	235	};
	236	struct nfs_diropok res = {
	237	.fh = &fhandle,
	238	.fattr = &fattr
	239	};
dead28da CL	240	struct rpc_message msg = {
	241	.rpc_proc = &nfs_procedures[NFSPROC_CREATE],
	242	.rpc_argp = &arg,
	243	.rpc_resp = &res,
	244	};
1da177e4 LT	245	int status, mode;
	246
	247	dprintk("NFS call mknod %s\n", dentry->d_name.name);
	248
	249	mode = sattr->ia_mode;
	250	if (S_ISFIFO(mode)) {
	251	sattr->ia_mode = (mode & ~S_IFMT) \| S_IFCHR;
	252	sattr->ia_valid &= ~ATTR_SIZE;
	253	} else if (S_ISCHR(mode) \|\| S_ISBLK(mode)) {
	254	sattr->ia_valid \|= ATTR_SIZE;
	255	sattr->ia_size = new_encode_dev(rdev);/* get out your barf bag */
	256	}
	257
0e574af1	258	nfs_fattr_init(&fattr);
dead28da	259	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
decf491f	260	nfs_mark_for_revalidate(dir);
1da177e4 LT	261
	262	if (status == -EINVAL && S_ISFIFO(mode)) {
	263	sattr->ia_mode = mode;
0e574af1	264	nfs_fattr_init(&fattr);
dead28da	265	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1da177e4 LT	266	}
	267	if (status == 0)
	268	status = nfs_instantiate(dentry, &fhandle, &fattr);
	269	dprintk("NFS reply mknod: %d\n", status);
	270	return status;
	271	}
	272
	273	static int
	274	nfs_proc_remove(struct inode dir, struct qstr name)
	275	{
4fdc17b2 TM	276	struct nfs_removeargs arg = {
	277	.fh = NFS_FH(dir),
	278	.name.len = name->len,
	279	.name.name = name->name,
1da177e4	280	};
4fdc17b2 TM	281	struct rpc_message msg = {
	282	.rpc_proc = &nfs_procedures[NFSPROC_REMOVE],
	283	.rpc_argp = &arg,
1da177e4 LT	284	};
	285	int status;
	286
	287	dprintk("NFS call remove %s\n", name->name);
	288	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
decf491f	289	nfs_mark_for_revalidate(dir);
1da177e4 LT	290
	291	dprintk("NFS reply remove: %d\n", status);
	292	return status;
	293	}
	294
e4eff1a6 TM	295	static void
e4eff1a6 TM	296	nfs_proc_unlink_setup(struct rpc_message msg, struct inode dir)
1da177e4	297	{
1da177e4	298	msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
1da177e4 LT	299	}
1da177e4 LT	300
e4eff1a6	301	static int nfs_proc_unlink_done(struct rpc_task task, struct inode dir)
1da177e4	302	{
e4eff1a6 TM	303	nfs_mark_for_revalidate(dir);
e4eff1a6 TM	304	return 1;
1da177e4 LT	305	}
	306
	307	static int
	308	nfs_proc_rename(struct inode old_dir, struct qstr old_name,
	309	struct inode new_dir, struct qstr new_name)
	310	{
	311	struct nfs_renameargs arg = {
	312	.fromfh = NFS_FH(old_dir),
	313	.fromname = old_name->name,
	314	.fromlen = old_name->len,
	315	.tofh = NFS_FH(new_dir),
	316	.toname = new_name->name,
	317	.tolen = new_name->len
	318	};
dead28da CL	319	struct rpc_message msg = {
	320	.rpc_proc = &nfs_procedures[NFSPROC_RENAME],
	321	.rpc_argp = &arg,
	322	};
1da177e4 LT	323	int status;
	324
	325	dprintk("NFS call rename %s -> %s\n", old_name->name, new_name->name);
dead28da	326	status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0);
decf491f TM	327	nfs_mark_for_revalidate(old_dir);
decf491f TM	328	nfs_mark_for_revalidate(new_dir);
1da177e4 LT	329	dprintk("NFS reply rename: %d\n", status);
	330	return status;
	331	}
	332
	333	static int
	334	nfs_proc_link(struct inode inode, struct inode dir, struct qstr *name)
	335	{
	336	struct nfs_linkargs arg = {
	337	.fromfh = NFS_FH(inode),
	338	.tofh = NFS_FH(dir),
	339	.toname = name->name,
	340	.tolen = name->len
	341	};
dead28da CL	342	struct rpc_message msg = {
	343	.rpc_proc = &nfs_procedures[NFSPROC_LINK],
	344	.rpc_argp = &arg,
	345	};
1da177e4 LT	346	int status;
	347
	348	dprintk("NFS call link %s\n", name->name);
dead28da	349	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
5ba7cc48	350	nfs_mark_for_revalidate(inode);
decf491f	351	nfs_mark_for_revalidate(dir);
1da177e4 LT	352	dprintk("NFS reply link: %d\n", status);
	353	return status;
	354	}
	355
	356	static int
94a6d753 CL	357	nfs_proc_symlink(struct inode dir, struct dentry dentry, struct page *page,
94a6d753 CL	358	unsigned int len, struct iattr *sattr)
1da177e4	359	{
4f390c15 CL	360	struct nfs_fh fhandle;
4f390c15 CL	361	struct nfs_fattr fattr;
1da177e4 LT	362	struct nfs_symlinkargs arg = {
1da177e4 LT	363	.fromfh = NFS_FH(dir),
4f390c15 CL	364	.fromname = dentry->d_name.name,
4f390c15 CL	365	.fromlen = dentry->d_name.len,
94a6d753 CL	366	.pages = &page,
94a6d753 CL	367	.pathlen = len,
1da177e4 LT	368	.sattr = sattr
1da177e4 LT	369	};
dead28da CL	370	struct rpc_message msg = {
	371	.rpc_proc = &nfs_procedures[NFSPROC_SYMLINK],
	372	.rpc_argp = &arg,
	373	};
1da177e4 LT	374	int status;
1da177e4 LT	375
94a6d753	376	if (len > NFS2_MAXPATHLEN)
1da177e4	377	return -ENAMETOOLONG;
4f390c15	378
94a6d753 CL	379	dprintk("NFS call symlink %s\n", dentry->d_name.name);
94a6d753 CL	380
dead28da	381	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
decf491f	382	nfs_mark_for_revalidate(dir);
4f390c15 CL	383
	384	/*
	385	* V2 SYMLINK requests don't return any attributes. Setting the
	386	* filehandle size to zero indicates to nfs_instantiate that it
	387	* should fill in the data with a LOOKUP call on the wire.
	388	*/
	389	if (status == 0) {
	390	nfs_fattr_init(&fattr);
	391	fhandle.size = 0;
	392	status = nfs_instantiate(dentry, &fhandle, &fattr);
	393	}
	394
1da177e4 LT	395	dprintk("NFS reply symlink: %d\n", status);
	396	return status;
	397	}
	398
	399	static int
	400	nfs_proc_mkdir(struct inode dir, struct dentry dentry, struct iattr *sattr)
	401	{
	402	struct nfs_fh fhandle;
	403	struct nfs_fattr fattr;
	404	struct nfs_createargs arg = {
	405	.fh = NFS_FH(dir),
	406	.name = dentry->d_name.name,
	407	.len = dentry->d_name.len,
	408	.sattr = sattr
	409	};
	410	struct nfs_diropok res = {
	411	.fh = &fhandle,
	412	.fattr = &fattr
	413	};
dead28da CL	414	struct rpc_message msg = {
	415	.rpc_proc = &nfs_procedures[NFSPROC_MKDIR],
	416	.rpc_argp = &arg,
	417	.rpc_resp = &res,
	418	};
1da177e4 LT	419	int status;
	420
	421	dprintk("NFS call mkdir %s\n", dentry->d_name.name);
0e574af1	422	nfs_fattr_init(&fattr);
dead28da	423	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
decf491f	424	nfs_mark_for_revalidate(dir);
1da177e4 LT	425	if (status == 0)
	426	status = nfs_instantiate(dentry, &fhandle, &fattr);
	427	dprintk("NFS reply mkdir: %d\n", status);
	428	return status;
	429	}
	430
	431	static int
	432	nfs_proc_rmdir(struct inode dir, struct qstr name)
	433	{
	434	struct nfs_diropargs arg = {
	435	.fh = NFS_FH(dir),
	436	.name = name->name,
	437	.len = name->len
	438	};
dead28da CL	439	struct rpc_message msg = {
	440	.rpc_proc = &nfs_procedures[NFSPROC_RMDIR],
	441	.rpc_argp = &arg,
	442	};
1da177e4 LT	443	int status;
	444
	445	dprintk("NFS call rmdir %s\n", name->name);
dead28da	446	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
decf491f	447	nfs_mark_for_revalidate(dir);
1da177e4 LT	448	dprintk("NFS reply rmdir: %d\n", status);
	449	return status;
	450	}
	451
	452	/*
	453	* The READDIR implementation is somewhat hackish - we pass a temporary
	454	* buffer to the encode function, which installs it in the receive
	455	* the receive iovec. The decode function just parses the reply to make
	456	* sure it is syntactically correct; the entries itself are decoded
	457	* from nfs_readdir by calling the decode_entry function directly.
	458	*/
	459	static int
	460	nfs_proc_readdir(struct dentry dentry, struct rpc_cred cred,
	461	u64 cookie, struct page *page, unsigned int count, int plus)
	462	{
	463	struct inode *dir = dentry->d_inode;
	464	struct nfs_readdirargs arg = {
	465	.fh = NFS_FH(dir),
	466	.cookie = cookie,
	467	.count = count,
dead28da	468	.pages = &page,
1da177e4 LT	469	};
	470	struct rpc_message msg = {
	471	.rpc_proc = &nfs_procedures[NFSPROC_READDIR],
	472	.rpc_argp = &arg,
dead28da	473	.rpc_cred = cred,
1da177e4 LT	474	};
	475	int status;
	476
1da177e4 LT	477	dprintk("NFS call readdir %d\n", (unsigned int)cookie);
	478	status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
	479
c4812998 TM	480	nfs_invalidate_atime(dir);
c4812998 TM	481
1da177e4	482	dprintk("NFS reply readdir: %d\n", status);
1da177e4 LT	483	return status;
	484	}
	485
	486	static int
	487	nfs_proc_statfs(struct nfs_server server, struct nfs_fh fhandle,
	488	struct nfs_fsstat *stat)
	489	{
	490	struct nfs2_fsstat fsinfo;
dead28da CL	491	struct rpc_message msg = {
	492	.rpc_proc = &nfs_procedures[NFSPROC_STATFS],
	493	.rpc_argp = fhandle,
	494	.rpc_resp = &fsinfo,
	495	};
1da177e4 LT	496	int status;
	497
	498	dprintk("NFS call statfs\n");
0e574af1	499	nfs_fattr_init(stat->fattr);
dead28da	500	status = rpc_call_sync(server->client, &msg, 0);
1da177e4 LT	501	dprintk("NFS reply statfs: %d\n", status);
	502	if (status)
	503	goto out;
	504	stat->tbytes = (u64)fsinfo.blocks * fsinfo.bsize;
	505	stat->fbytes = (u64)fsinfo.bfree * fsinfo.bsize;
	506	stat->abytes = (u64)fsinfo.bavail * fsinfo.bsize;
	507	stat->tfiles = 0;
	508	stat->ffiles = 0;
	509	stat->afiles = 0;
	510	out:
	511	return status;
	512	}
	513
	514	static int
	515	nfs_proc_fsinfo(struct nfs_server server, struct nfs_fh fhandle,
	516	struct nfs_fsinfo *info)
	517	{
	518	struct nfs2_fsstat fsinfo;
dead28da CL	519	struct rpc_message msg = {
	520	.rpc_proc = &nfs_procedures[NFSPROC_STATFS],
	521	.rpc_argp = fhandle,
	522	.rpc_resp = &fsinfo,
	523	};
1da177e4 LT	524	int status;
	525
	526	dprintk("NFS call fsinfo\n");
0e574af1	527	nfs_fattr_init(info->fattr);
dead28da	528	status = rpc_call_sync(server->client, &msg, 0);
1da177e4 LT	529	dprintk("NFS reply fsinfo: %d\n", status);
	530	if (status)
	531	goto out;
	532	info->rtmax = NFS_MAXDATA;
	533	info->rtpref = fsinfo.tsize;
	534	info->rtmult = fsinfo.bsize;
	535	info->wtmax = NFS_MAXDATA;
	536	info->wtpref = fsinfo.tsize;
	537	info->wtmult = fsinfo.bsize;
	538	info->dtpref = fsinfo.tsize;
	539	info->maxfilesize = 0x7FFFFFFF;
	540	info->lease_time = 0;
	541	out:
	542	return status;
	543	}
	544
	545	static int
	546	nfs_proc_pathconf(struct nfs_server server, struct nfs_fh fhandle,
	547	struct nfs_pathconf *info)
	548	{
	549	info->max_link = 0;
	550	info->max_namelen = NFS2_MAXNAMLEN;
	551	return 0;
	552	}
	553
ec06c096	554	static int nfs_read_done(struct rpc_task task, struct nfs_read_data data)
1da177e4	555	{
8850df99	556	nfs_invalidate_atime(data->inode);
1da177e4 LT	557	if (task->tk_status >= 0) {
	558	nfs_refresh_inode(data->inode, data->res.fattr);
	559	/* Emulate the eof flag, which isn't normally needed in NFSv2
	560	* as it is guaranteed to always return the file attributes
	561	*/
	562	if (data->args.offset + data->args.count >= data->res.fattr->size)
	563	data->res.eof = 1;
	564	}
ec06c096	565	return 0;
1da177e4 LT	566	}
1da177e4 LT	567
bdc7f021	568	static void nfs_proc_read_setup(struct nfs_read_data data, struct rpc_message msg)
1da177e4	569	{
bdc7f021	570	msg->rpc_proc = &nfs_procedures[NFSPROC_READ];
1da177e4 LT	571	}
1da177e4 LT	572
788e7a89	573	static int nfs_write_done(struct rpc_task task, struct nfs_write_data data)
1da177e4	574	{
1da177e4	575	if (task->tk_status >= 0)
70ca8852	576	nfs_post_op_update_inode_force_wcc(data->inode, data->res.fattr);
788e7a89	577	return 0;
1da177e4 LT	578	}
1da177e4 LT	579
bdc7f021	580	static void nfs_proc_write_setup(struct nfs_write_data data, struct rpc_message msg)
1da177e4	581	{
1da177e4 LT	582	/* Note: NFSv2 ignores @stable and always uses NFS_FILE_SYNC */
1da177e4 LT	583	data->args.stable = NFS_FILE_SYNC;
bdc7f021	584	msg->rpc_proc = &nfs_procedures[NFSPROC_WRITE];
1da177e4 LT	585	}
	586
	587	static void
bdc7f021	588	nfs_proc_commit_setup(struct nfs_write_data data, struct rpc_message msg)
1da177e4 LT	589	{
	590	BUG();
	591	}
	592
	593	static int
	594	nfs_proc_lock(struct file filp, int cmd, struct file_lock fl)
	595	{
1093a60e CL	596	struct inode *inode = filp->f_path.dentry->d_inode;
	597
	598	return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
1da177e4 LT	599	}
	600
	601
509de811	602	const struct nfs_rpc_ops nfs_v2_clientops = {
1da177e4 LT	603	.version = 2, /* protocol version */
	604	.dentry_ops = &nfs_dentry_operations,
	605	.dir_inode_ops = &nfs_dir_inode_operations,
92cfc62c	606	.file_inode_ops = &nfs_file_inode_operations,
1da177e4 LT	607	.getroot = nfs_proc_get_root,
	608	.getattr = nfs_proc_getattr,
	609	.setattr = nfs_proc_setattr,
	610	.lookup = nfs_proc_lookup,
	611	.access = NULL, /* access */
	612	.readlink = nfs_proc_readlink,
1da177e4 LT	613	.create = nfs_proc_create,
	614	.remove = nfs_proc_remove,
	615	.unlink_setup = nfs_proc_unlink_setup,
	616	.unlink_done = nfs_proc_unlink_done,
	617	.rename = nfs_proc_rename,
	618	.link = nfs_proc_link,
	619	.symlink = nfs_proc_symlink,
	620	.mkdir = nfs_proc_mkdir,
	621	.rmdir = nfs_proc_rmdir,
	622	.readdir = nfs_proc_readdir,
	623	.mknod = nfs_proc_mknod,
	624	.statfs = nfs_proc_statfs,
	625	.fsinfo = nfs_proc_fsinfo,
	626	.pathconf = nfs_proc_pathconf,
	627	.decode_dirent = nfs_decode_dirent,
	628	.read_setup = nfs_proc_read_setup,
ec06c096	629	.read_done = nfs_read_done,
1da177e4	630	.write_setup = nfs_proc_write_setup,
788e7a89	631	.write_done = nfs_write_done,
1da177e4 LT	632	.commit_setup = nfs_proc_commit_setup,
	633	.file_open = nfs_open,
	634	.file_release = nfs_release,
	635	.lock = nfs_proc_lock,
	636	};