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/*
 * net/9p/clnt.c
 *
 * 9P Client
 *
 *  Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */
 
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/idr.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
#include <net/9p/9p.h>
#include <linux/parser.h>
#include <net/9p/transport.h>
#include <net/9p/conn.h>
#include <net/9p/client.h>
 
static struct p9_fid *p9_fid_create(struct p9_client *clnt);
static void p9_fid_destroy(struct p9_fid *fid);
static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu);
 
struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
								   int dotu)
{
	int err, n;
	struct p9_client *clnt;
	struct p9_fcall *tc, *rc;
	struct p9_str *version;
 
	err = 0;
	tc = NULL;
	rc = NULL;
	clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
	if (!clnt)
		return ERR_PTR(-ENOMEM);
 
	P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n",
		clnt, trans, msize, dotu);
	spin_lock_init(&clnt->lock);
	clnt->trans = trans;
	clnt->msize = msize;
	clnt->dotu = dotu;
	INIT_LIST_HEAD(&clnt->fidlist);
	clnt->fidpool = p9_idpool_create();
	if (!clnt->fidpool) {
		err = PTR_ERR(clnt->fidpool);
		clnt->fidpool = NULL;
		goto error;
	}
 
	clnt->conn = p9_conn_create(clnt->trans, clnt->msize, &clnt->dotu);
	if (IS_ERR(clnt->conn)) {
		err = PTR_ERR(clnt->conn);
		clnt->conn = NULL;
		goto error;
	}
 
	tc = p9_create_tversion(clnt->msize, clnt->dotu?"9P2000.u":"9P2000");
	if (IS_ERR(tc)) {
		err = PTR_ERR(tc);
		tc = NULL;
		goto error;
	}
 
	err = p9_conn_rpc(clnt->conn, tc, &rc);
	if (err)
		goto error;
 
	version = &rc->params.rversion.version;
	if (version->len == 8 && !memcmp(version->str, "9P2000.u", 8))
		clnt->dotu = 1;
	else if (version->len == 6 && !memcmp(version->str, "9P2000", 6))
		clnt->dotu = 0;
	else {
		err = -EREMOTEIO;
		goto error;
	}
 
	n = rc->params.rversion.msize;
	if (n < clnt->msize)
		clnt->msize = n;
 
	kfree(tc);
	kfree(rc);
	return clnt;
 
error:
	kfree(tc);
	kfree(rc);
	p9_client_destroy(clnt);
	return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_create);
 
void p9_client_destroy(struct p9_client *clnt)
{
	struct p9_fid *fid, *fidptr;
 
	P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
	if (clnt->conn) {
		p9_conn_destroy(clnt->conn);
		clnt->conn = NULL;
	}
 
	if (clnt->trans) {
		clnt->trans->close(clnt->trans);
		kfree(clnt->trans);
		clnt->trans = NULL;
	}
 
	list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
		p9_fid_destroy(fid);
 
	if (clnt->fidpool)
		p9_idpool_destroy(clnt->fidpool);
 
	kfree(clnt);
}
EXPORT_SYMBOL(p9_client_destroy);
 
void p9_client_disconnect(struct p9_client *clnt)
{
	P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
	clnt->trans->status = Disconnected;
	p9_conn_cancel(clnt->conn, -EIO);
}
EXPORT_SYMBOL(p9_client_disconnect);
 
struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
	char *uname, u32 n_uname, char *aname)
{
	int err;
	struct p9_fcall *tc, *rc;
	struct p9_fid *fid;
 
	P9_DPRINTK(P9_DEBUG_9P, "clnt %p afid %d uname %s aname %s\n",
		clnt, afid?afid->fid:-1, uname, aname);
	err = 0;
	tc = NULL;
	rc = NULL;
 
	fid = p9_fid_create(clnt);
	if (IS_ERR(fid)) {
		err = PTR_ERR(fid);
		fid = NULL;
		goto error;
	}
 
	tc = p9_create_tattach(fid->fid, afid?afid->fid:P9_NOFID, uname, aname,
		n_uname, clnt->dotu);
	if (IS_ERR(tc)) {
		err = PTR_ERR(tc);
		tc = NULL;
		goto error;
	}
 
	err = p9_conn_rpc(clnt->conn, tc, &rc);
	if (err)
		goto error;
 
	memmove(&fid->qid, &rc->params.rattach.qid, sizeof(struct p9_qid));
	kfree(tc);
	kfree(rc);
	return fid;
 
error:
	kfree(tc);
	kfree(rc);
	if (fid)
		p9_fid_destroy(fid);
	return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_attach);
 
struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname,
	u32 n_uname, char *aname)
{
	int err;
	struct p9_fcall *tc, *rc;
	struct p9_fid *fid;
 
	P9_DPRINTK(P9_DEBUG_9P, "clnt %p uname %s aname %s\n", clnt, uname,
									aname);
	err = 0;
	tc = NULL;
	rc = NULL;
 
	fid = p9_fid_create(clnt);
	if (IS_ERR(fid)) {
		err = PTR_ERR(fid);
		fid = NULL;
		goto error;
	}
 
	tc = p9_create_tauth(fid->fid, uname, aname, n_uname, clnt->dotu);
	if (IS_ERR(tc)) {
		err = PTR_ERR(tc);
		tc = NULL;
		goto error;
	}
 
	err = p9_conn_rpc(clnt->conn, tc, &rc);
	if (err)
		goto error;
 
	memmove(&fid->qid, &rc->params.rauth.qid, sizeof(struct p9_qid));
	kfree(tc);
	kfree(rc);
	return fid;
 
error:
	kfree(tc);
	kfree(rc);
	if (fid)
		p9_fid_destroy(fid);
	return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_auth);
 
struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
	int clone)
{
	int err;
	struct p9_fcall *tc, *rc;
	struct p9_client *clnt;
	struct p9_fid *fid;
 
	P9_DPRINTK(P9_DEBUG_9P, "fid %d nwname %d wname[0] %s\n",
		oldfid->fid, nwname, wnames?wnames[0]:NULL);
	err = 0;
	tc = NULL;
	rc = NULL;
	clnt = oldfid->clnt;
	if (clone) {
		fid = p9_fid_create(clnt);
		if (IS_ERR(fid)) {
			err = PTR_ERR(fid);
			fid = NULL;
			goto error;
		}
 
		fid->uid = oldfid->uid;
	} else
		fid = oldfid;
 
	tc = p9_create_twalk(oldfid->fid, fid->fid, nwname, wnames);
	if (IS_ERR(tc)) {
		err = PTR_ERR(tc);
		tc = NULL;
		goto error;
	}
 
	err = p9_conn_rpc(clnt->conn, tc, &rc);
	if (err) {
		if (rc && rc->id == P9_RWALK)
			goto clunk_fid;
		else
			goto error;
	}
 
	if (rc->params.rwalk.nwqid != nwname) {
		err = -ENOENT;
		goto clunk_fid;
	}
 
	if (nwname)
		memmove(&fid->qid,
			&rc->params.rwalk.wqids[rc->params.rwalk.nwqid - 1],
			sizeof(struct p9_qid));
	else
		fid->qid = oldfid->qid;
 
	kfree(tc);
	kfree(rc);
	return fid;
 
clunk_fid:
	kfree(tc);
	kfree(rc);
	rc = NULL;
	tc = p9_create_tclunk(fid->fid);
	if (IS_ERR(tc)) {
		err = PTR_ERR(tc);
		tc = NULL;
		goto error;
	}
 
	p9_conn_rpc(clnt->conn, tc, &rc);
 
error:
	kfree(tc);
	kfree(rc);
	if (fid && (fid != oldfid))
		p9_fid_destroy(fid);
 
	return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_walk);
 
int p9_client_open(struct p9_fid *fid, int mode)
{
	int err;
	struct p9_fcall *tc, *rc;
	struct p9_client *clnt;
 
	P9_DPRINTK(P9_DEBUG_9P, "fid %d mode %d\n", fid->fid, mode);
	err = 0;
	tc = NULL;
	rc = NULL;
	clnt = fid->clnt;
 
	if (fid->mode != -1)
		return -EINVAL;
 
	tc = p9_create_topen(fid->fid, mode);
	if (IS_ERR(tc)) {
		err = PTR_ERR(tc);
		tc = NULL;
		goto done;
	}
 
	err = p9_conn_rpc(clnt->conn, tc, &rc);
	if (err)
		goto done;
 
	fid->mode = mode;
	fid->iounit = rc->params.ropen.iounit;
 
done:
	kfree(tc);
	kfree(rc);
	return err;
}
EXPORT_SYMBOL(p9_client_open);
 
int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
		     char *extension)
{
	int err;
	struct p9_fcall *tc, *rc;
	struct p9_client *clnt;
 
	P9_DPRINTK(P9_DEBUG_9P, "fid %d name %s perm %d mode %d\n", fid->fid,
		name, perm, mode);
	err = 0;
	tc = NULL;
	rc = NULL;
	clnt = fid->clnt;
 
	if (fid->mode != -1)
		return -EINVAL;
 
	tc = p9_create_tcreate(fid->fid, name, perm, mode, extension,
							       clnt->dotu);
	if (IS_ERR(tc)) {
		err = PTR_ERR(tc);
		tc = NULL;
		goto done;
	}
 
	err = p9_conn_rpc(clnt->conn, tc, &rc);
	if (err)
		goto done;
 
	fid->mode = mode;
	fid->iounit = rc->params.ropen.iounit;
 
done:
	kfree(tc);
	kfree(rc);
	return err;
}
EXPORT_SYMBOL(p9_client_fcreate);
 
int p9_client_clunk(struct p9_fid *fid)
{
	int err;
	struct p9_fcall *tc, *rc;
	struct p9_client *clnt;
 
	P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
	err = 0;
	tc = NULL;
	rc = NULL;
	clnt = fid->clnt;
 
	tc = p9_create_tclunk(fid->fid);
	if (IS_ERR(tc)) {
		err = PTR_ERR(tc);
		tc = NULL;
		goto done;
	}
 
	err = p9_conn_rpc(clnt->conn, tc, &rc);
	if (err)
		goto done;
 
	p9_fid_destroy(fid);
 
done:
	kfree(tc);
	kfree(rc);
	return err;
}
EXPORT_SYMBOL(p9_client_clunk);
 
int p9_client_remove(struct p9_fid *fid)
{
	int err;
	struct p9_fcall *tc, *rc;
	struct p9_client *clnt;
 
	P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
	err = 0;
	tc = NULL;
	rc = NULL;
	clnt = fid->clnt;
 
	tc = p9_create_tremove(fid->fid);
	if (IS_ERR(tc)) {
		err = PTR_ERR(tc);
		tc = NULL;
		goto done;
	}
 
	err = p9_conn_rpc(clnt->conn, tc, &rc);
	if (err)
		goto done;
 
	p9_fid_destroy(fid);
 
done:
	kfree(tc);
	kfree(rc);
	return err;
}
EXPORT_SYMBOL(p9_client_remove);
 
int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count)
{
	int err, n, rsize, total;
	struct p9_fcall *tc, *rc;
	struct p9_client *clnt;
 
	P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu %d\n", fid->fid,
					(long long unsigned) offset, count);
	err = 0;
	tc = NULL;
	rc = NULL;
	clnt = fid->clnt;
	total = 0;
 
	rsize = fid->iounit;
	if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
		rsize = clnt->msize - P9_IOHDRSZ;
 
	do {
		if (count < rsize)
			rsize = count;
 
		tc = p9_create_tread(fid->fid, offset, rsize);
		if (IS_ERR(tc)) {
			err = PTR_ERR(tc);
			tc = NULL;
			goto error;
		}
 
		err = p9_conn_rpc(clnt->conn, tc, &rc);
		if (err)
			goto error;
 
		n = rc->params.rread.count;
		if (n > count)
			n = count;
 
		memmove(data, rc->params.rread.data, n);
		count -= n;
		data += n;
		offset += n;
		total += n;
		kfree(tc);
		tc = NULL;
		kfree(rc);
		rc = NULL;
	} while (count > 0 && n == rsize);
 
	return total;
 
error:
	kfree(tc);
	kfree(rc);
	return err;
}
EXPORT_SYMBOL(p9_client_read);
 
int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count)
{
	int err, n, rsize, total;
	struct p9_fcall *tc, *rc;
	struct p9_client *clnt;
 
	P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
					(long long unsigned) offset, count);
	err = 0;
	tc = NULL;
	rc = NULL;
	clnt = fid->clnt;
	total = 0;
 
	rsize = fid->iounit;
	if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
		rsize = clnt->msize - P9_IOHDRSZ;
 
	do {
		if (count < rsize)
			rsize = count;
 
		tc = p9_create_twrite(fid->fid, offset, rsize, data);
		if (IS_ERR(tc)) {
			err = PTR_ERR(tc);
			tc = NULL;
			goto error;
		}
 
		err = p9_conn_rpc(clnt->conn, tc, &rc);
		if (err)
			goto error;
 
		n = rc->params.rread.count;
		count -= n;
		data += n;
		offset += n;
		total += n;
		kfree(tc);
		tc = NULL;
		kfree(rc);
		rc = NULL;
	} while (count > 0);
 
	return total;
 
error:
	kfree(tc);
	kfree(rc);
	return err;
}
EXPORT_SYMBOL(p9_client_write);
 
int
p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count)
{
	int err, n, rsize, total;
	struct p9_fcall *tc, *rc;
	struct p9_client *clnt;
 
	P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
					(long long unsigned) offset, count);
	err = 0;
	tc = NULL;
	rc = NULL;
	clnt = fid->clnt;
	total = 0;
 
	rsize = fid->iounit;
	if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
		rsize = clnt->msize - P9_IOHDRSZ;
 
	do {
		if (count < rsize)
			rsize = count;
 
		tc = p9_create_tread(fid->fid, offset, rsize);
		if (IS_ERR(tc)) {
			err = PTR_ERR(tc);
			tc = NULL;
			goto error;
		}
 
		err = p9_conn_rpc(clnt->conn, tc, &rc);
		if (err)
			goto error;
 
		n = rc->params.rread.count;
		if (n > count)
			n = count;
 
		err = copy_to_user(data, rc->params.rread.data, n);
		if (err) {
			err = -EFAULT;
			goto error;
		}
 
		count -= n;
		data += n;
		offset += n;
		total += n;
		kfree(tc);
		tc = NULL;
		kfree(rc);
		rc = NULL;
	} while (count > 0 && n == rsize);
 
	return total;
 
error:
	kfree(tc);
	kfree(rc);
	return err;
}
EXPORT_SYMBOL(p9_client_uread);
 
int
p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset,
								   u32 count)
{
	int err, n, rsize, total;
	struct p9_fcall *tc, *rc;
	struct p9_client *clnt;
 
	P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
					(long long unsigned) offset, count);
	err = 0;
	tc = NULL;
	rc = NULL;
	clnt = fid->clnt;
	total = 0;
 
	rsize = fid->iounit;
	if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
		rsize = clnt->msize - P9_IOHDRSZ;
 
	do {
		if (count < rsize)
			rsize = count;
 
		tc = p9_create_twrite_u(fid->fid, offset, rsize, data);
		if (IS_ERR(tc)) {
			err = PTR_ERR(tc);
			tc = NULL;
			goto error;
		}
 
		err = p9_conn_rpc(clnt->conn, tc, &rc);
		if (err)
			goto error;
 
		n = rc->params.rread.count;
		count -= n;
		data += n;
		offset += n;
		total += n;
		kfree(tc);
		tc = NULL;
		kfree(rc);
		rc = NULL;
	} while (count > 0);
 
	return total;
 
error:
	kfree(tc);
	kfree(rc);
	return err;
}
EXPORT_SYMBOL(p9_client_uwrite);
 
int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count)
{
	int n, total;
 
	P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
					(long long unsigned) offset, count);
	n = 0;
	total = 0;
	while (count) {
		n = p9_client_read(fid, data, offset, count);
		if (n <= 0)
			break;
 
		data += n;
		offset += n;
		count -= n;
		total += n;
	}
 
	if (n < 0)
		total = n;
 
	return total;
}
EXPORT_SYMBOL(p9_client_readn);
 
struct p9_stat *p9_client_stat(struct p9_fid *fid)
{
	int err;
	struct p9_fcall *tc, *rc;
	struct p9_client *clnt;
	struct p9_stat *ret;
 
	P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
	err = 0;
	tc = NULL;
	rc = NULL;
	ret = NULL;
	clnt = fid->clnt;
 
	tc = p9_create_tstat(fid->fid);
	if (IS_ERR(tc)) {
		err = PTR_ERR(tc);
		tc = NULL;
		goto error;
	}
 
	err = p9_conn_rpc(clnt->conn, tc, &rc);
	if (err)
		goto error;
 
	ret = p9_clone_stat(&rc->params.rstat.stat, clnt->dotu);
	if (IS_ERR(ret)) {
		err = PTR_ERR(ret);
		ret = NULL;
		goto error;
	}
 
	kfree(tc);
	kfree(rc);
	return ret;
 
error:
	kfree(tc);
	kfree(rc);
	kfree(ret);
	return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_stat);
 
int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
{
	int err;
	struct p9_fcall *tc, *rc;
	struct p9_client *clnt;
 
	P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
	err = 0;
	tc = NULL;
	rc = NULL;
	clnt = fid->clnt;
 
	tc = p9_create_twstat(fid->fid, wst, clnt->dotu);
	if (IS_ERR(tc)) {
		err = PTR_ERR(tc);
		tc = NULL;
		goto done;
	}
 
	err = p9_conn_rpc(clnt->conn, tc, &rc);
 
done:
	kfree(tc);
	kfree(rc);
	return err;
}
EXPORT_SYMBOL(p9_client_wstat);
 
struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset)
{
	int err, n, m;
	struct p9_fcall *tc, *rc;
	struct p9_client *clnt;
	struct p9_stat st, *ret;
 
	P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu\n", fid->fid,
						(long long unsigned) offset);
	err = 0;
	tc = NULL;
	rc = NULL;
	ret = NULL;
	clnt = fid->clnt;
 
	/* if the offset is below or above the current response, free it */
	if (offset < fid->rdir_fpos || (fid->rdir_fcall &&
		offset >= fid->rdir_fpos+fid->rdir_fcall->params.rread.count)) {
		fid->rdir_pos = 0;
		if (fid->rdir_fcall)
			fid->rdir_fpos += fid->rdir_fcall->params.rread.count;
 
		kfree(fid->rdir_fcall);
		fid->rdir_fcall = NULL;
		if (offset < fid->rdir_fpos)
			fid->rdir_fpos = 0;
	}
 
	if (!fid->rdir_fcall) {
		n = fid->iounit;
		if (!n || n > clnt->msize-P9_IOHDRSZ)
			n = clnt->msize - P9_IOHDRSZ;
 
		while (1) {
			if (fid->rdir_fcall) {
				fid->rdir_fpos +=
					fid->rdir_fcall->params.rread.count;
				kfree(fid->rdir_fcall);
				fid->rdir_fcall = NULL;
			}
 
			tc = p9_create_tread(fid->fid, fid->rdir_fpos, n);
			if (IS_ERR(tc)) {
				err = PTR_ERR(tc);
				tc = NULL;
				goto error;
			}
 
			err = p9_conn_rpc(clnt->conn, tc, &rc);
			if (err)
				goto error;
 
			n = rc->params.rread.count;
			if (n == 0)
				goto done;
 
			fid->rdir_fcall = rc;
			rc = NULL;
			if (offset >= fid->rdir_fpos &&
						offset < fid->rdir_fpos+n)
				break;
		}
 
		fid->rdir_pos = 0;
	}
 
	m = offset - fid->rdir_fpos;
	if (m < 0)
		goto done;
 
	n = p9_deserialize_stat(fid->rdir_fcall->params.rread.data + m,
		fid->rdir_fcall->params.rread.count - m, &st, clnt->dotu);
 
	if (!n) {
		err = -EIO;
		goto error;
	}
 
	fid->rdir_pos += n;
	st.size = n;
	ret = p9_clone_stat(&st, clnt->dotu);
	if (IS_ERR(ret)) {
		err = PTR_ERR(ret);
		ret = NULL;
		goto error;
	}
 
done:
	kfree(tc);
	kfree(rc);
	return ret;
 
error:
	kfree(tc);
	kfree(rc);
	kfree(ret);
	return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_dirread);
 
static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu)
{
	int n;
	char *p;
	struct p9_stat *ret;
 
	n = sizeof(struct p9_stat) + st->name.len + st->uid.len + st->gid.len +
		st->muid.len;
 
	if (dotu)
		n += st->extension.len;
 
	ret = kmalloc(n, GFP_KERNEL);
	if (!ret)
		return ERR_PTR(-ENOMEM);
 
	memmove(ret, st, sizeof(struct p9_stat));
	p = ((char *) ret) + sizeof(struct p9_stat);
	memmove(p, st->name.str, st->name.len);
	p += st->name.len;
	memmove(p, st->uid.str, st->uid.len);
	p += st->uid.len;
	memmove(p, st->gid.str, st->gid.len);
	p += st->gid.len;
	memmove(p, st->muid.str, st->muid.len);
	p += st->muid.len;
 
	if (dotu) {
		memmove(p, st->extension.str, st->extension.len);
		p += st->extension.len;
	}
 
	return ret;
}
 
static struct p9_fid *p9_fid_create(struct p9_client *clnt)
{
	int err;
	struct p9_fid *fid;
 
	P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
	fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
	if (!fid)
		return ERR_PTR(-ENOMEM);
 
	fid->fid = p9_idpool_get(clnt->fidpool);
	if (fid->fid < 0) {
		err = -ENOSPC;
		goto error;
	}
 
	memset(&fid->qid, 0, sizeof(struct p9_qid));
	fid->mode = -1;
	fid->rdir_fpos = 0;
	fid->rdir_pos = 0;
	fid->rdir_fcall = NULL;
	fid->uid = current->fsuid;
	fid->clnt = clnt;
	fid->aux = NULL;
 
	spin_lock(&clnt->lock);
	list_add(&fid->flist, &clnt->fidlist);
	spin_unlock(&clnt->lock);
 
	return fid;
 
error:
	kfree(fid);
	return ERR_PTR(err);
}
 
static void p9_fid_destroy(struct p9_fid *fid)
{
	struct p9_client *clnt;
 
	P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid);
	clnt = fid->clnt;
	p9_idpool_put(fid->fid, clnt->fidpool);
	spin_lock(&clnt->lock);
	list_del(&fid->flist);
	spin_unlock(&clnt->lock);
	kfree(fid->rdir_fcall);
	kfree(fid);
}