client.c 51.8 KB
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/*
 * net/9p/clnt.c
 *
 * 9P Client
 *
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 *  Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
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 *  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
 *
 */

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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
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#include <linux/poll.h>
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#include <linux/idr.h>
#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
#include <linux/uaccess.h>
#include <net/9p/9p.h>
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#include <linux/parser.h>
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#include <net/9p/client.h>
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#include <net/9p/transport.h>
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#include "protocol.h"
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#define CREATE_TRACE_POINTS
#include <trace/events/9p.h>

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/*
  * Client Option Parsing (code inspired by NFS code)
  *  - a little lazy - parse all client options
  */

enum {
	Opt_msize,
	Opt_trans,
	Opt_legacy,
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	Opt_version,
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	Opt_err,
};

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static const match_table_t tokens = {
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	{Opt_msize, "msize=%u"},
	{Opt_legacy, "noextend"},
	{Opt_trans, "trans=%s"},
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	{Opt_version, "version=%s"},
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	{Opt_err, NULL},
};

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inline int p9_is_proto_dotl(struct p9_client *clnt)
{
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	return clnt->proto_version == p9_proto_2000L;
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}
EXPORT_SYMBOL(p9_is_proto_dotl);

inline int p9_is_proto_dotu(struct p9_client *clnt)
{
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	return clnt->proto_version == p9_proto_2000u;
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}
EXPORT_SYMBOL(p9_is_proto_dotu);

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Simon Derr 已提交
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/*
 * Some error codes are taken directly from the server replies,
 * make sure they are valid.
 */
static int safe_errno(int err)
{
	if ((err > 0) || (err < -MAX_ERRNO)) {
		p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
		return -EPROTO;
	}
	return err;
}


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/* Interpret mount option for protocol version */
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static int get_protocol_version(char *s)
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{
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	int version = -EINVAL;

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	if (!strcmp(s, "9p2000")) {
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		version = p9_proto_legacy;
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		p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
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	} else if (!strcmp(s, "9p2000.u")) {
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		version = p9_proto_2000u;
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		p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
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	} else if (!strcmp(s, "9p2000.L")) {
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		version = p9_proto_2000L;
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		p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
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	} else
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		pr_info("Unknown protocol version %s\n", s);
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	return version;
}

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/**
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 * parse_options - parse mount options into client structure
 * @opts: options string passed from mount
 * @clnt: existing v9fs client information
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 *
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 * Return 0 upon success, -ERRNO upon failure
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 */

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static int parse_opts(char *opts, struct p9_client *clnt)
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{
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	char *options, *tmp_options;
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	char *p;
	substring_t args[MAX_OPT_ARGS];
	int option;
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	char *s;
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	int ret = 0;
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	clnt->proto_version = p9_proto_2000L;
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	clnt->msize = 8192;

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	if (!opts)
		return 0;

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	tmp_options = kstrdup(opts, GFP_KERNEL);
	if (!tmp_options) {
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		p9_debug(P9_DEBUG_ERROR,
			 "failed to allocate copy of option string\n");
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		return -ENOMEM;
	}
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Eric Van Hensbergen 已提交
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	options = tmp_options;
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	while ((p = strsep(&options, ",")) != NULL) {
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		int token, r;
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		if (!*p)
			continue;
		token = match_token(p, tokens, args);
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		switch (token) {
		case Opt_msize:
			r = match_int(&args[0], &option);
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			if (r < 0) {
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				p9_debug(P9_DEBUG_ERROR,
					 "integer field, but no integer?\n");
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				ret = r;
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				continue;
			}
			clnt->msize = option;
			break;
		case Opt_trans:
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			s = match_strdup(&args[0]);
			if (!s) {
				ret = -ENOMEM;
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				p9_debug(P9_DEBUG_ERROR,
					 "problem allocating copy of trans arg\n");
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				goto free_and_return;
			 }
			clnt->trans_mod = v9fs_get_trans_by_name(s);
			if (clnt->trans_mod == NULL) {
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				pr_info("Could not find request transport: %s\n",
					s);
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				ret = -EINVAL;
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				kfree(s);
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				goto free_and_return;
			}
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			kfree(s);
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			break;
		case Opt_legacy:
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			clnt->proto_version = p9_proto_legacy;
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			break;
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		case Opt_version:
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			s = match_strdup(&args[0]);
			if (!s) {
				ret = -ENOMEM;
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				p9_debug(P9_DEBUG_ERROR,
					 "problem allocating copy of version arg\n");
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				goto free_and_return;
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			}
			ret = get_protocol_version(s);
			if (ret == -EINVAL) {
				kfree(s);
				goto free_and_return;
			}
			kfree(s);
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			clnt->proto_version = ret;
			break;
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		default:
			continue;
		}
	}
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202
free_and_return:
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	kfree(tmp_options);
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	return ret;
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}

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/**
 * p9_tag_alloc - lookup/allocate a request by tag
 * @c: client session to lookup tag within
 * @tag: numeric id for transaction
 *
 * this is a simple array lookup, but will grow the
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Lucas De Marchi 已提交
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 * request_slots as necessary to accommodate transaction
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 * ids which did not previously have a slot.
 *
 * this code relies on the client spinlock to manage locks, its
 * possible we should switch to something else, but I'd rather
 * stick with something low-overhead for the common case.
 *
 */

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static struct p9_req_t *
p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
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{
	unsigned long flags;
	int row, col;
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	struct p9_req_t *req;
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	int alloc_msize = min(c->msize, max_size);
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	/* This looks up the original request by tag so we know which
	 * buffer to read the data into */
	tag++;

	if (tag >= c->max_tag) {
		spin_lock_irqsave(&c->lock, flags);
		/* check again since original check was outside of lock */
		while (tag >= c->max_tag) {
			row = (tag / P9_ROW_MAXTAG);
			c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
					sizeof(struct p9_req_t), GFP_ATOMIC);

			if (!c->reqs[row]) {
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				pr_err("Couldn't grow tag array\n");
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Eric Van Hensbergen 已提交
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				spin_unlock_irqrestore(&c->lock, flags);
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				return ERR_PTR(-ENOMEM);
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			}
			for (col = 0; col < P9_ROW_MAXTAG; col++) {
				c->reqs[row][col].status = REQ_STATUS_IDLE;
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				c->reqs[row][col].tc = NULL;
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			}
			c->max_tag += P9_ROW_MAXTAG;
		}
		spin_unlock_irqrestore(&c->lock, flags);
	}
	row = tag / P9_ROW_MAXTAG;
	col = tag % P9_ROW_MAXTAG;

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	req = &c->reqs[row][col];
	if (!req->tc) {
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		req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
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		if (!req->wq) {
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			pr_err("Couldn't grow tag array\n");
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			return ERR_PTR(-ENOMEM);
		}
		init_waitqueue_head(req->wq);
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		req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
				  GFP_NOFS);
		req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
				  GFP_NOFS);
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		if ((!req->tc) || (!req->rc)) {
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			pr_err("Couldn't grow tag array\n");
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			kfree(req->tc);
			kfree(req->rc);
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			kfree(req->wq);
			req->tc = req->rc = NULL;
			req->wq = NULL;
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			return ERR_PTR(-ENOMEM);
		}
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		req->tc->capacity = alloc_msize;
		req->rc->capacity = alloc_msize;
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		req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
		req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
	}

	p9pdu_reset(req->tc);
	p9pdu_reset(req->rc);

	req->tc->tag = tag-1;
	req->status = REQ_STATUS_ALLOC;
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	return &c->reqs[row][col];
}

/**
 * p9_tag_lookup - lookup a request by tag
 * @c: client session to lookup tag within
 * @tag: numeric id for transaction
 *
 */

struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
{
	int row, col;

	/* This looks up the original request by tag so we know which
	 * buffer to read the data into */
	tag++;

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	if(tag >= c->max_tag) 
		return NULL;
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	row = tag / P9_ROW_MAXTAG;
	col = tag % P9_ROW_MAXTAG;

	return &c->reqs[row][col];
}
EXPORT_SYMBOL(p9_tag_lookup);

/**
 * p9_tag_init - setup tags structure and contents
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Abhishek Kulkarni 已提交
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 * @c:  v9fs client struct
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 *
 * This initializes the tags structure for each client instance.
 *
 */

static int p9_tag_init(struct p9_client *c)
{
	int err = 0;

	c->tagpool = p9_idpool_create();
	if (IS_ERR(c->tagpool)) {
		err = PTR_ERR(c->tagpool);
		goto error;
	}
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	err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
	if (err < 0) {
		p9_idpool_destroy(c->tagpool);
		goto error;
	}
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	c->max_tag = 0;
error:
	return err;
}

/**
 * p9_tag_cleanup - cleans up tags structure and reclaims resources
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Abhishek Kulkarni 已提交
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 * @c:  v9fs client struct
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 *
 * This frees resources associated with the tags structure
 *
 */
static void p9_tag_cleanup(struct p9_client *c)
{
	int row, col;

	/* check to insure all requests are idle */
	for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
		for (col = 0; col < P9_ROW_MAXTAG; col++) {
			if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
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				p9_debug(P9_DEBUG_MUX,
					 "Attempting to cleanup non-free tag %d,%d\n",
					 row, col);
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				/* TODO: delay execution of cleanup */
				return;
			}
		}
	}

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	if (c->tagpool) {
		p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
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		p9_idpool_destroy(c->tagpool);
373
	}
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	/* free requests associated with tags */
	for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
377
		for (col = 0; col < P9_ROW_MAXTAG; col++) {
378
			kfree(c->reqs[row][col].wq);
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			kfree(c->reqs[row][col].tc);
			kfree(c->reqs[row][col].rc);
		}
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		kfree(c->reqs[row]);
	}
	c->max_tag = 0;
}

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/**
 * p9_free_req - free a request and clean-up as necessary
 * c: client state
 * r: request to release
 *
 */

394
static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
395
{
396
	int tag = r->tc->tag;
397
	p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
398

399
	r->status = REQ_STATUS_IDLE;
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	if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
		p9_idpool_put(tag, c->tagpool);
402 403
}

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/**
 * p9_client_cb - call back from transport to client
 * c: client state
 * req: request received
 *
 */
void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
{
412
	p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
413
	wake_up(req->wq);
414
	p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
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}
EXPORT_SYMBOL(p9_client_cb);

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/**
 * p9_parse_header - parse header arguments out of a packet
 * @pdu: packet to parse
 * @size: size of packet
 * @type: type of request
 * @tag: tag of packet
 * @rewind: set if we need to rewind offset afterwards
 */

int
p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
								int rewind)
{
	int8_t r_type;
	int16_t r_tag;
	int32_t r_size;
	int offset = pdu->offset;
	int err;

	pdu->offset = 0;
	if (pdu->size == 0)
		pdu->size = 7;

	err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
	if (err)
		goto rewind_and_exit;

	pdu->size = r_size;
	pdu->id = r_type;
	pdu->tag = r_tag;

449 450
	p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
		 pdu->size, pdu->id, pdu->tag);
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	if (type)
		*type = r_type;
	if (tag)
		*tag = r_tag;
	if (size)
		*size = r_size;


rewind_and_exit:
	if (rewind)
		pdu->offset = offset;
	return err;
}
EXPORT_SYMBOL(p9_parse_header);

/**
 * p9_check_errors - check 9p packet for error return and process it
 * @c: current client instance
 * @req: request to parse and check for error conditions
 *
 * returns error code if one is discovered, otherwise returns 0
 *
 * this will have to be more complicated if we have multiple
 * error packet types
 */

static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
{
	int8_t type;
	int err;
482
	int ecode;
483 484

	err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
485 486 487 488 489
	/*
	 * dump the response from server
	 * This should be after check errors which poplulate pdu_fcall.
	 */
	trace_9p_protocol_dump(c, req->rc);
490
	if (err) {
491
		p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
492 493
		return err;
	}
494 495
	if (type != P9_RERROR && type != P9_RLERROR)
		return 0;
496

497 498 499
	if (!p9_is_proto_dotl(c)) {
		char *ename;
		err = p9pdu_readf(req->rc, c->proto_version, "s?d",
500
				  &ename, &ecode);
501 502
		if (err)
			goto out_err;
503

504 505
		if (p9_is_proto_dotu(c))
			err = -ecode;
506

507 508
		if (!err || !IS_ERR_VALUE(err)) {
			err = p9_errstr2errno(ename, strlen(ename));
509

510 511
			p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
				 -ecode, ename);
512
		}
513
		kfree(ename);
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	} else {
		err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
		err = -ecode;

518
		p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
519
	}
520 521

	return err;
522 523

out_err:
524
	p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
525 526

	return err;
527 528
}

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/**
 * p9_check_zc_errors - check 9p packet for error return and process it
 * @c: current client instance
 * @req: request to parse and check for error conditions
 * @in_hdrlen: Size of response protocol buffer.
 *
 * returns error code if one is discovered, otherwise returns 0
 *
 * this will have to be more complicated if we have multiple
 * error packet types
 */

static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
			      char *uidata, int in_hdrlen, int kern_buf)
{
	int err;
	int ecode;
	int8_t type;
	char *ename = NULL;

	err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
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	/*
	 * dump the response from server
	 * This should be after parse_header which poplulate pdu_fcall.
	 */
	trace_9p_protocol_dump(c, req->rc);
555
	if (err) {
556
		p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
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		return err;
	}

	if (type != P9_RERROR && type != P9_RLERROR)
		return 0;

	if (!p9_is_proto_dotl(c)) {
		/* Error is reported in string format */
		uint16_t len;
		/* 7 = header size for RERROR, 2 is the size of string len; */
		int inline_len = in_hdrlen - (7 + 2);

		/* Read the size of error string */
		err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
		if (err)
			goto out_err;

		ename = kmalloc(len + 1, GFP_NOFS);
		if (!ename) {
			err = -ENOMEM;
			goto out_err;
		}
		if (len <= inline_len) {
			/* We have error in protocol buffer itself */
			if (pdu_read(req->rc, ename, len)) {
				err = -EFAULT;
				goto out_free;

			}
		} else {
			/*
			 *  Part of the data is in user space buffer.
			 */
			if (pdu_read(req->rc, ename, inline_len)) {
				err = -EFAULT;
				goto out_free;

			}
			if (kern_buf) {
				memcpy(ename + inline_len, uidata,
				       len - inline_len);
			} else {
				err = copy_from_user(ename + inline_len,
						     uidata, len - inline_len);
				if (err) {
					err = -EFAULT;
					goto out_free;
				}
			}
		}
		ename[len] = 0;
		if (p9_is_proto_dotu(c)) {
			/* For dotu we also have error code */
			err = p9pdu_readf(req->rc,
					  c->proto_version, "d", &ecode);
			if (err)
				goto out_free;
			err = -ecode;
		}
		if (!err || !IS_ERR_VALUE(err)) {
			err = p9_errstr2errno(ename, strlen(ename));

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			p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
				 -ecode, ename);
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		}
		kfree(ename);
	} else {
		err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
		err = -ecode;

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		p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
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	}
	return err;

out_free:
	kfree(ename);
out_err:
634
	p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
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	return err;
}

R
Rob Landley 已提交
638 639 640
static struct p9_req_t *
p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);

641 642
/**
 * p9_client_flush - flush (cancel) a request
A
Abhishek Kulkarni 已提交
643 644
 * @c: client state
 * @oldreq: request to cancel
645
 *
R
Rob Landley 已提交
646
 * This sents a flush for a particular request and links
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 * the flush request to the original request.  The current
 * code only supports a single flush request although the protocol
 * allows for multiple flush requests to be sent for a single request.
 *
 */

static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
{
	struct p9_req_t *req;
	int16_t oldtag;
	int err;

	err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
	if (err)
		return err;

663
	p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
664 665 666 667 668 669

	req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
	if (IS_ERR(req))
		return PTR_ERR(req);


670 671 672 673 674 675 676 677
	/* if we haven't received a response for oldreq,
	   remove it from the list. */
	spin_lock(&c->lock);
	if (oldreq->status == REQ_STATUS_FLSH)
		list_del(&oldreq->req_list);
	spin_unlock(&c->lock);

	p9_free_req(c, req);
678 679 680
	return 0;
}

681 682 683
static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
					      int8_t type, int req_size,
					      const char *fmt, va_list ap)
684
{
685
	int tag, err;
686 687
	struct p9_req_t *req;

688
	p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
689

690 691 692 693 694 695
	/* we allow for any status other than disconnected */
	if (c->status == Disconnected)
		return ERR_PTR(-EIO);

	/* if status is begin_disconnected we allow only clunk request */
	if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
696
		return ERR_PTR(-EIO);
697 698

	tag = P9_NOTAG;
699
	if (type != P9_TVERSION) {
700 701
		tag = p9_idpool_get(c->tagpool);
		if (tag < 0)
702
			return ERR_PTR(-ENOMEM);
703 704
	}

705
	req = p9_tag_alloc(c, tag, req_size);
706 707
	if (IS_ERR(req))
		return req;
708

709 710
	/* marshall the data */
	p9pdu_prepare(req->tc, tag, type);
711
	err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
712 713
	if (err)
		goto reterr;
714 715
	p9pdu_finalize(c, req->tc);
	trace_9p_client_req(c, type, tag);
716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749
	return req;
reterr:
	p9_free_req(c, req);
	return ERR_PTR(err);
}

/**
 * p9_client_rpc - issue a request and wait for a response
 * @c: client session
 * @type: type of request
 * @fmt: protocol format string (see protocol.c)
 *
 * Returns request structure (which client must free using p9_free_req)
 */

static struct p9_req_t *
p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
{
	va_list ap;
	int sigpending, err;
	unsigned long flags;
	struct p9_req_t *req;

	va_start(ap, fmt);
	req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
	va_end(ap);
	if (IS_ERR(req))
		return req;

	if (signal_pending(current)) {
		sigpending = 1;
		clear_thread_flag(TIF_SIGPENDING);
	} else
		sigpending = 0;
750 751 752

	err = c->trans_mod->request(c, req);
	if (err < 0) {
753
		if (err != -ERESTARTSYS && err != -EFAULT)
754
			c->status = Disconnected;
755 756
		goto reterr;
	}
757
again:
758
	/* Wait for the response */
759
	err = wait_event_interruptible(*req->wq,
760
				       req->status >= REQ_STATUS_RCVD);
761

762 763 764 765 766 767 768
	if ((err == -ERESTARTSYS) && (c->status == Connected)
				  && (type == P9_TFLUSH)) {
		sigpending = 1;
		clear_thread_flag(TIF_SIGPENDING);
		goto again;
	}

769
	if (req->status == REQ_STATUS_ERROR) {
770
		p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
771 772
		err = req->t_err;
	}
773
	if ((err == -ERESTARTSYS) && (c->status == Connected)) {
774
		p9_debug(P9_DEBUG_MUX, "flushing\n");
775 776 777
		sigpending = 1;
		clear_thread_flag(TIF_SIGPENDING);

778 779 780 781 782 783
		if (c->trans_mod->cancel(c, req))
			p9_client_flush(c, req);

		/* if we received the response anyway, don't signal error */
		if (req->status == REQ_STATUS_RCVD)
			err = 0;
784 785 786 787 788 789 790 791 792
	}
	if (sigpending) {
		spin_lock_irqsave(&current->sighand->siglock, flags);
		recalc_sigpending();
		spin_unlock_irqrestore(&current->sighand->siglock, flags);
	}
	if (err < 0)
		goto reterr;

793
	err = p9_check_errors(c, req);
794 795
	trace_9p_client_res(c, type, req->rc->tag, err);
	if (!err)
796
		return req;
797 798
reterr:
	p9_free_req(c, req);
S
Simon Derr 已提交
799
	return ERR_PTR(safe_errno(err));
800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852
}

/**
 * p9_client_zc_rpc - issue a request and wait for a response
 * @c: client session
 * @type: type of request
 * @uidata: user bffer that should be ued for zero copy read
 * @uodata: user buffer that shoud be user for zero copy write
 * @inlen: read buffer size
 * @olen: write buffer size
 * @hdrlen: reader header size, This is the size of response protocol data
 * @fmt: protocol format string (see protocol.c)
 *
 * Returns request structure (which client must free using p9_free_req)
 */
static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
					 char *uidata, char *uodata,
					 int inlen, int olen, int in_hdrlen,
					 int kern_buf, const char *fmt, ...)
{
	va_list ap;
	int sigpending, err;
	unsigned long flags;
	struct p9_req_t *req;

	va_start(ap, fmt);
	/*
	 * We allocate a inline protocol data of only 4k bytes.
	 * The actual content is passed in zero-copy fashion.
	 */
	req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
	va_end(ap);
	if (IS_ERR(req))
		return req;

	if (signal_pending(current)) {
		sigpending = 1;
		clear_thread_flag(TIF_SIGPENDING);
	} else
		sigpending = 0;

	/* If we are called with KERNEL_DS force kern_buf */
	if (segment_eq(get_fs(), KERNEL_DS))
		kern_buf = 1;

	err = c->trans_mod->zc_request(c, req, uidata, uodata,
				       inlen, olen, in_hdrlen, kern_buf);
	if (err < 0) {
		if (err == -EIO)
			c->status = Disconnected;
		goto reterr;
	}
	if (req->status == REQ_STATUS_ERROR) {
853
		p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
854 855 856
		err = req->t_err;
	}
	if ((err == -ERESTARTSYS) && (c->status == Connected)) {
857
		p9_debug(P9_DEBUG_MUX, "flushing\n");
858 859
		sigpending = 1;
		clear_thread_flag(TIF_SIGPENDING);
860

861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876
		if (c->trans_mod->cancel(c, req))
			p9_client_flush(c, req);

		/* if we received the response anyway, don't signal error */
		if (req->status == REQ_STATUS_RCVD)
			err = 0;
	}
	if (sigpending) {
		spin_lock_irqsave(&current->sighand->siglock, flags);
		recalc_sigpending();
		spin_unlock_irqrestore(&current->sighand->siglock, flags);
	}
	if (err < 0)
		goto reterr;

	err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
877 878
	trace_9p_client_res(c, type, req->rc->tag, err);
	if (!err)
879
		return req;
880 881
reterr:
	p9_free_req(c, req);
S
Simon Derr 已提交
882
	return ERR_PTR(safe_errno(err));
883 884
}

885 886
static struct p9_fid *p9_fid_create(struct p9_client *clnt)
{
R
Roel Kluin 已提交
887
	int ret;
888
	struct p9_fid *fid;
889
	unsigned long flags;
890

891
	p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
892 893 894 895
	fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
	if (!fid)
		return ERR_PTR(-ENOMEM);

R
Roel Kluin 已提交
896
	ret = p9_idpool_get(clnt->fidpool);
897
	if (ret < 0) {
R
Roel Kluin 已提交
898
		ret = -ENOSPC;
899 900
		goto error;
	}
R
Roel Kluin 已提交
901
	fid->fid = ret;
902 903 904

	memset(&fid->qid, 0, sizeof(struct p9_qid));
	fid->mode = -1;
905
	fid->uid = current_fsuid();
906
	fid->clnt = clnt;
E
Eric Van Hensbergen 已提交
907
	fid->rdir = NULL;
908
	spin_lock_irqsave(&clnt->lock, flags);
909
	list_add(&fid->flist, &clnt->fidlist);
910
	spin_unlock_irqrestore(&clnt->lock, flags);
911 912 913 914 915

	return fid;

error:
	kfree(fid);
R
Roel Kluin 已提交
916
	return ERR_PTR(ret);
917 918 919 920 921
}

static void p9_fid_destroy(struct p9_fid *fid)
{
	struct p9_client *clnt;
922
	unsigned long flags;
923

924
	p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
925 926
	clnt = fid->clnt;
	p9_idpool_put(fid->fid, clnt->fidpool);
927
	spin_lock_irqsave(&clnt->lock, flags);
928
	list_del(&fid->flist);
929
	spin_unlock_irqrestore(&clnt->lock, flags);
E
Eric Van Hensbergen 已提交
930
	kfree(fid->rdir);
931 932
	kfree(fid);
}
933

S
stephen hemminger 已提交
934
static int p9_client_version(struct p9_client *c)
935
{
936
	int err = 0;
937 938 939
	struct p9_req_t *req;
	char *version;
	int msize;
940

941 942
	p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
		 c->msize, c->proto_version);
943 944

	switch (c->proto_version) {
945
	case p9_proto_2000L:
946
		req = p9_client_rpc(c, P9_TVERSION, "ds",
947
					c->msize, "9P2000.L");
948 949 950 951 952 953 954 955 956 957 958 959 960 961
		break;
	case p9_proto_2000u:
		req = p9_client_rpc(c, P9_TVERSION, "ds",
					c->msize, "9P2000.u");
		break;
	case p9_proto_legacy:
		req = p9_client_rpc(c, P9_TVERSION, "ds",
					c->msize, "9P2000");
		break;
	default:
		return -EINVAL;
		break;
	}

962 963
	if (IS_ERR(req))
		return PTR_ERR(req);
964

965
	err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
966
	if (err) {
967
		p9_debug(P9_DEBUG_9P, "version error %d\n", err);
968
		trace_9p_protocol_dump(c, req->rc);
969
		goto error;
970
	}
971

972
	p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
973 974
	if (!strncmp(version, "9P2000.L", 8))
		c->proto_version = p9_proto_2000L;
975
	else if (!strncmp(version, "9P2000.u", 8))
976 977 978
		c->proto_version = p9_proto_2000u;
	else if (!strncmp(version, "9P2000", 6))
		c->proto_version = p9_proto_legacy;
979 980 981 982 983
	else {
		err = -EREMOTEIO;
		goto error;
	}

984 985
	if (msize < c->msize)
		c->msize = msize;
986 987

error:
988 989
	kfree(version);
	p9_free_req(c, req);
990 991 992 993 994 995 996 997 998 999

	return err;
}

struct p9_client *p9_client_create(const char *dev_name, char *options)
{
	int err;
	struct p9_client *clnt;

	err = 0;
1000 1001 1002 1003
	clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
	if (!clnt)
		return ERR_PTR(-ENOMEM);

1004
	clnt->trans_mod = NULL;
1005
	clnt->trans = NULL;
1006 1007 1008
	spin_lock_init(&clnt->lock);
	INIT_LIST_HEAD(&clnt->fidlist);

1009 1010 1011
	err = p9_tag_init(clnt);
	if (err < 0)
		goto free_client;
1012

1013 1014
	err = parse_opts(options, clnt);
	if (err < 0)
1015
		goto destroy_tagpool;
1016

1017 1018 1019
	if (!clnt->trans_mod)
		clnt->trans_mod = v9fs_get_trans_by_name("virtio");

1020 1021 1022
	if (!clnt->trans_mod)
		clnt->trans_mod = v9fs_get_default_trans();

1023 1024
	if (clnt->trans_mod == NULL) {
		err = -EPROTONOSUPPORT;
1025 1026
		p9_debug(P9_DEBUG_ERROR,
			 "No transport defined or default transport\n");
1027
		goto destroy_tagpool;
1028 1029 1030 1031 1032 1033
	}

	clnt->fidpool = p9_idpool_create();
	if (IS_ERR(clnt->fidpool)) {
		err = PTR_ERR(clnt->fidpool);
		goto put_trans;
1034 1035
	}

1036 1037
	p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
		 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1038

1039 1040
	err = clnt->trans_mod->create(clnt, dev_name, options);
	if (err)
1041
		goto destroy_fidpool;
1042

1043 1044
	if (clnt->msize > clnt->trans_mod->maxsize)
		clnt->msize = clnt->trans_mod->maxsize;
1045

1046
	err = p9_client_version(clnt);
1047
	if (err)
1048
		goto close_trans;
1049 1050 1051

	return clnt;

1052 1053 1054 1055 1056 1057
close_trans:
	clnt->trans_mod->close(clnt);
destroy_fidpool:
	p9_idpool_destroy(clnt->fidpool);
put_trans:
	v9fs_put_trans(clnt->trans_mod);
1058 1059
destroy_tagpool:
	p9_idpool_destroy(clnt->tagpool);
1060 1061
free_client:
	kfree(clnt);
1062 1063 1064 1065 1066 1067 1068 1069
	return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_create);

void p9_client_destroy(struct p9_client *clnt)
{
	struct p9_fid *fid, *fidptr;

1070
	p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1071

1072 1073
	if (clnt->trans_mod)
		clnt->trans_mod->close(clnt);
1074

1075 1076
	v9fs_put_trans(clnt->trans_mod);

1077
	list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1078
		pr_info("Found fid %d not clunked\n", fid->fid);
1079
		p9_fid_destroy(fid);
1080
	}
1081

1082 1083 1084
	if (clnt->fidpool)
		p9_idpool_destroy(clnt->fidpool);

1085 1086
	p9_tag_cleanup(clnt);

1087 1088 1089 1090 1091 1092
	kfree(clnt);
}
EXPORT_SYMBOL(p9_client_destroy);

void p9_client_disconnect(struct p9_client *clnt)
{
1093
	p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1094
	clnt->status = Disconnected;
1095 1096 1097
}
EXPORT_SYMBOL(p9_client_disconnect);

1098 1099
void p9_client_begin_disconnect(struct p9_client *clnt)
{
1100
	p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1101 1102 1103 1104
	clnt->status = BeginDisconnect;
}
EXPORT_SYMBOL(p9_client_begin_disconnect);

1105
struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1106
	char *uname, kuid_t n_uname, char *aname)
1107
{
1108
	int err = 0;
1109
	struct p9_req_t *req;
1110
	struct p9_fid *fid;
1111
	struct p9_qid qid;
1112 1113


1114 1115
	p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
		 afid ? afid->fid : -1, uname, aname);
1116 1117 1118 1119 1120 1121 1122
	fid = p9_fid_create(clnt);
	if (IS_ERR(fid)) {
		err = PTR_ERR(fid);
		fid = NULL;
		goto error;
	}

1123
	req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1124 1125 1126
			afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
1127 1128 1129
		goto error;
	}

1130
	err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1131
	if (err) {
1132
		trace_9p_protocol_dump(clnt, req->rc);
1133
		p9_free_req(clnt, req);
1134
		goto error;
1135
	}
1136

1137 1138
	p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
		 qid.type, (unsigned long long)qid.path, qid.version);
1139 1140 1141 1142

	memmove(&fid->qid, &qid, sizeof(struct p9_qid));

	p9_free_req(clnt, req);
1143 1144 1145 1146 1147 1148 1149 1150 1151
	return fid;

error:
	if (fid)
		p9_fid_destroy(fid);
	return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_attach);

1152 1153
struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
		char **wnames, int clone)
1154 1155 1156 1157
{
	int err;
	struct p9_client *clnt;
	struct p9_fid *fid;
1158 1159
	struct p9_qid *wqids;
	struct p9_req_t *req;
1160
	uint16_t nwqids, count;
1161 1162

	err = 0;
1163
	wqids = NULL;
1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176
	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;

1177

1178 1179
	p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
		 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1180 1181 1182 1183 1184

	req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
								nwname, wnames);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
1185 1186 1187
		goto error;
	}

1188
	err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
E
Eric Van Hensbergen 已提交
1189
	if (err) {
1190
		trace_9p_protocol_dump(clnt, req->rc);
E
Eric Van Hensbergen 已提交
1191
		p9_free_req(clnt, req);
1192
		goto clunk_fid;
E
Eric Van Hensbergen 已提交
1193 1194
	}
	p9_free_req(clnt, req);
1195

1196
	p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1197 1198

	if (nwqids != nwname) {
1199 1200 1201 1202
		err = -ENOENT;
		goto clunk_fid;
	}

1203
	for (count = 0; count < nwqids; count++)
1204
		p9_debug(P9_DEBUG_9P, "<<<     [%d] %x.%llx.%x\n",
R
Randy Dunlap 已提交
1205 1206
			count, wqids[count].type,
			(unsigned long long)wqids[count].path,
1207 1208
			wqids[count].version);

1209
	if (nwname)
1210
		memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1211 1212 1213
	else
		fid->qid = oldfid->qid;

1214
	kfree(wqids);
1215 1216 1217
	return fid;

clunk_fid:
1218
	kfree(wqids);
1219 1220
	p9_client_clunk(fid);
	fid = NULL;
1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233

error:
	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_client *clnt;
1234 1235 1236
	struct p9_req_t *req;
	struct p9_qid qid;
	int iounit;
1237 1238

	clnt = fid->clnt;
1239
	p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
M
M. Mohan Kumar 已提交
1240 1241
		p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
	err = 0;
1242 1243 1244 1245

	if (fid->mode != -1)
		return -EINVAL;

M
M. Mohan Kumar 已提交
1246 1247 1248 1249
	if (p9_is_proto_dotl(clnt))
		req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
	else
		req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1250 1251 1252
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
1253 1254
	}

1255
	err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
E
Eric Van Hensbergen 已提交
1256
	if (err) {
1257
		trace_9p_protocol_dump(clnt, req->rc);
E
Eric Van Hensbergen 已提交
1258 1259
		goto free_and_error;
	}
1260

1261
	p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
M
M. Mohan Kumar 已提交
1262 1263
		p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN",  qid.type,
		(unsigned long long)qid.path, qid.version, iounit);
1264 1265

	fid->mode = mode;
1266
	fid->iounit = iounit;
1267

E
Eric Van Hensbergen 已提交
1268 1269
free_and_error:
	p9_free_req(clnt, req);
1270
error:
1271 1272 1273 1274
	return err;
}
EXPORT_SYMBOL(p9_client_open);

1275
int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1276
		kgid_t gid, struct p9_qid *qid)
1277 1278 1279 1280 1281 1282
{
	int err = 0;
	struct p9_client *clnt;
	struct p9_req_t *req;
	int iounit;

1283
	p9_debug(P9_DEBUG_9P,
1284
			">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1285 1286
			ofid->fid, name, flags, mode,
		 	from_kgid(&init_user_ns, gid));
1287 1288 1289 1290 1291
	clnt = ofid->clnt;

	if (ofid->mode != -1)
		return -EINVAL;

1292
	req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1293 1294 1295 1296 1297 1298 1299 1300
			mode, gid);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
	}

	err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
	if (err) {
1301
		trace_9p_protocol_dump(clnt, req->rc);
1302 1303 1304
		goto free_and_error;
	}

1305
	p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319
			qid->type,
			(unsigned long long)qid->path,
			qid->version, iounit);

	ofid->mode = mode;
	ofid->iounit = iounit;

free_and_error:
	p9_free_req(clnt, req);
error:
	return err;
}
EXPORT_SYMBOL(p9_client_create_dotl);

1320 1321 1322 1323 1324
int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
		     char *extension)
{
	int err;
	struct p9_client *clnt;
1325 1326 1327
	struct p9_req_t *req;
	struct p9_qid qid;
	int iounit;
1328

1329
	p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1330
						fid->fid, name, perm, mode);
1331 1332 1333 1334 1335 1336
	err = 0;
	clnt = fid->clnt;

	if (fid->mode != -1)
		return -EINVAL;

1337 1338 1339 1340 1341
	req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
				mode, extension);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
1342 1343
	}

1344
	err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
E
Eric Van Hensbergen 已提交
1345
	if (err) {
1346
		trace_9p_protocol_dump(clnt, req->rc);
E
Eric Van Hensbergen 已提交
1347 1348
		goto free_and_error;
	}
1349

1350
	p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
R
Randy Dunlap 已提交
1351 1352 1353
				qid.type,
				(unsigned long long)qid.path,
				qid.version, iounit);
1354 1355

	fid->mode = mode;
1356
	fid->iounit = iounit;
1357

E
Eric Van Hensbergen 已提交
1358 1359
free_and_error:
	p9_free_req(clnt, req);
1360
error:
1361 1362 1363 1364
	return err;
}
EXPORT_SYMBOL(p9_client_fcreate);

1365
int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1366 1367 1368 1369 1370 1371
		struct p9_qid *qid)
{
	int err = 0;
	struct p9_client *clnt;
	struct p9_req_t *req;

1372
	p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s  symtgt %s\n",
1373 1374 1375
			dfid->fid, name, symtgt);
	clnt = dfid->clnt;

1376
	req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1377 1378 1379 1380 1381 1382 1383 1384
			gid);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
	}

	err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
	if (err) {
1385
		trace_9p_protocol_dump(clnt, req->rc);
1386 1387 1388
		goto free_and_error;
	}

1389
	p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1390 1391 1392 1393 1394 1395 1396 1397 1398
			qid->type, (unsigned long long)qid->path, qid->version);

free_and_error:
	p9_free_req(clnt, req);
error:
	return err;
}
EXPORT_SYMBOL(p9_client_symlink);

1399 1400 1401 1402 1403
int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
{
	struct p9_client *clnt;
	struct p9_req_t *req;

1404
	p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1405 1406 1407 1408 1409 1410 1411
			dfid->fid, oldfid->fid, newname);
	clnt = dfid->clnt;
	req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
			newname);
	if (IS_ERR(req))
		return PTR_ERR(req);

1412
	p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1413 1414 1415 1416 1417
	p9_free_req(clnt, req);
	return 0;
}
EXPORT_SYMBOL(p9_client_link);

1418
int p9_client_fsync(struct p9_fid *fid, int datasync)
1419 1420 1421 1422 1423
{
	int err;
	struct p9_client *clnt;
	struct p9_req_t *req;

1424
	p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1425
			fid->fid, datasync);
1426 1427 1428
	err = 0;
	clnt = fid->clnt;

1429
	req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1430 1431 1432 1433 1434
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
	}

1435
	p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1436 1437 1438 1439 1440 1441 1442 1443

	p9_free_req(clnt, req);

error:
	return err;
}
EXPORT_SYMBOL(p9_client_fsync);

1444 1445 1446 1447
int p9_client_clunk(struct p9_fid *fid)
{
	int err;
	struct p9_client *clnt;
1448
	struct p9_req_t *req;
1449
	int retries = 0;
1450

1451
	if (!fid) {
1452 1453
		pr_warn("%s (%d): Trying to clunk with NULL fid\n",
			__func__, task_pid_nr(current));
1454 1455 1456 1457
		dump_stack();
		return 0;
	}

1458 1459 1460
again:
	p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
								retries);
1461 1462 1463
	err = 0;
	clnt = fid->clnt;

1464 1465 1466 1467
	req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
1468 1469
	}

1470
	p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1471

1472 1473
	p9_free_req(clnt, req);
error:
1474 1475
	/*
	 * Fid is not valid even after a failed clunk
1476 1477
	 * If interrupted, retry once then give up and
	 * leak fid until umount.
1478
	 */
1479 1480 1481 1482 1483
	if (err == -ERESTARTSYS) {
		if (retries++ == 0)
			goto again;
	} else
		p9_fid_destroy(fid);
1484 1485 1486 1487 1488 1489 1490 1491
	return err;
}
EXPORT_SYMBOL(p9_client_clunk);

int p9_client_remove(struct p9_fid *fid)
{
	int err;
	struct p9_client *clnt;
1492
	struct p9_req_t *req;
1493

1494
	p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1495 1496 1497
	err = 0;
	clnt = fid->clnt;

1498 1499 1500 1501
	req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
1502 1503
	}

1504
	p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1505

1506 1507
	p9_free_req(clnt, req);
error:
1508 1509 1510 1511
	if (err == -ERESTARTSYS)
		p9_client_clunk(fid);
	else
		p9_fid_destroy(fid);
1512 1513 1514 1515
	return err;
}
EXPORT_SYMBOL(p9_client_remove);

1516 1517 1518 1519 1520 1521
int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
{
	int err = 0;
	struct p9_req_t *req;
	struct p9_client *clnt;

1522
	p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1523 1524 1525 1526 1527 1528 1529 1530
		   dfid->fid, name, flags);

	clnt = dfid->clnt;
	req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
	}
1531
	p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1532 1533 1534 1535 1536 1537 1538

	p9_free_req(clnt, req);
error:
	return err;
}
EXPORT_SYMBOL(p9_client_unlinkat);

1539 1540 1541
int
p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
								u32 count)
1542
{
1543
	char *dataptr;
1544 1545 1546 1547 1548
	int kernel_buf = 0;
	struct p9_req_t *req;
	struct p9_client *clnt;
	int err, rsize, non_zc = 0;

1549

1550
	p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1551
		   fid->fid, (unsigned long long) offset, count);
1552 1553 1554 1555 1556 1557 1558
	err = 0;
	clnt = fid->clnt;

	rsize = fid->iounit;
	if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
		rsize = clnt->msize - P9_IOHDRSZ;

1559 1560
	if (count < rsize)
		rsize = count;
1561

R
Rob Landley 已提交
1562
	/* Don't bother zerocopy for small IO (< 1024) */
1563 1564 1565 1566 1567 1568
	if (clnt->trans_mod->zc_request && rsize > 1024) {
		char *indata;
		if (data) {
			kernel_buf = 1;
			indata = data;
		} else
1569
			indata = (__force char *)udata;
1570 1571 1572 1573 1574 1575 1576
		/*
		 * response header len is 11
		 * PDU Header(7) + IO Size (4)
		 */
		req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
				       11, kernel_buf, "dqd", fid->fid,
				       offset, rsize);
1577
	} else {
1578
		non_zc = 1;
1579
		req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1580
				    rsize);
1581
	}
1582 1583 1584 1585
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
	}
1586

1587
	err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
E
Eric Van Hensbergen 已提交
1588
	if (err) {
1589
		trace_9p_protocol_dump(clnt, req->rc);
1590
		goto free_and_error;
E
Eric Van Hensbergen 已提交
1591
	}
1592

1593
	p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1594

1595
	if (non_zc) {
1596 1597 1598 1599 1600 1601 1602 1603
		if (data) {
			memmove(data, dataptr, count);
		} else {
			err = copy_to_user(udata, dataptr, count);
			if (err) {
				err = -EFAULT;
				goto free_and_error;
			}
1604
		}
1605 1606 1607
	}
	p9_free_req(clnt, req);
	return count;
1608

1609 1610
free_and_error:
	p9_free_req(clnt, req);
1611 1612 1613
error:
	return err;
}
1614
EXPORT_SYMBOL(p9_client_read);
1615 1616

int
1617 1618
p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
							u64 offset, u32 count)
1619
{
1620
	int err, rsize;
1621
	int kernel_buf = 0;
1622
	struct p9_client *clnt;
1623
	struct p9_req_t *req;
1624

1625
	p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1626
				fid->fid, (unsigned long long) offset, count);
1627 1628 1629 1630 1631 1632 1633
	err = 0;
	clnt = fid->clnt;

	rsize = fid->iounit;
	if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
		rsize = clnt->msize - P9_IOHDRSZ;

1634 1635
	if (count < rsize)
		rsize = count;
1636

1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647
	/* Don't bother zerocopy for small IO (< 1024) */
	if (clnt->trans_mod->zc_request && rsize > 1024) {
		char *odata;
		if (data) {
			kernel_buf = 1;
			odata = data;
		} else
			odata = (char *)udata;
		req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
				       P9_ZC_HDR_SZ, kernel_buf, "dqd",
				       fid->fid, offset, rsize);
1648 1649 1650
	} else {
		if (data)
			req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1651
					    offset, rsize, data);
1652 1653
		else
			req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1654
					    offset, rsize, udata);
1655
	}
1656 1657 1658 1659
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
	}
1660

1661
	err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
E
Eric Van Hensbergen 已提交
1662
	if (err) {
1663
		trace_9p_protocol_dump(clnt, req->rc);
1664
		goto free_and_error;
E
Eric Van Hensbergen 已提交
1665 1666
	}

1667
	p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1668

1669 1670
	p9_free_req(clnt, req);
	return count;
1671

1672 1673
free_and_error:
	p9_free_req(clnt, req);
1674 1675 1676
error:
	return err;
}
1677
EXPORT_SYMBOL(p9_client_write);
1678

1679
struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1680
{
1681 1682 1683 1684 1685
	int err;
	struct p9_client *clnt;
	struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
	struct p9_req_t *req;
	u16 ignored;
1686

1687
	p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1688 1689 1690 1691

	if (!ret)
		return ERR_PTR(-ENOMEM);

1692 1693 1694
	err = 0;
	clnt = fid->clnt;

1695 1696 1697
	req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
1698 1699 1700
		goto error;
	}

1701
	err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
E
Eric Van Hensbergen 已提交
1702
	if (err) {
1703
		trace_9p_protocol_dump(clnt, req->rc);
1704 1705
		p9_free_req(clnt, req);
		goto error;
E
Eric Van Hensbergen 已提交
1706
	}
1707

1708
	p9_debug(P9_DEBUG_9P,
E
Eric Van Hensbergen 已提交
1709 1710 1711 1712
		"<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
		"<<<    mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
		"<<<    name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
		"<<<    uid=%d gid=%d n_muid=%d\n",
1713
		ret->size, ret->type, ret->dev, ret->qid.type,
R
Randy Dunlap 已提交
1714 1715 1716
		(unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
		ret->atime, ret->mtime, (unsigned long long)ret->length,
		ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1717 1718 1719
		from_kuid(&init_user_ns, ret->n_uid),
		from_kgid(&init_user_ns, ret->n_gid),
		from_kuid(&init_user_ns, ret->n_muid));
1720

1721 1722 1723
	p9_free_req(clnt, req);
	return ret;

1724
error:
1725 1726
	kfree(ret);
	return ERR_PTR(err);
1727 1728 1729
}
EXPORT_SYMBOL(p9_client_stat);

1730 1731 1732 1733 1734 1735 1736 1737 1738
struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
							u64 request_mask)
{
	int err;
	struct p9_client *clnt;
	struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
								GFP_KERNEL);
	struct p9_req_t *req;

1739
	p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755
							fid->fid, request_mask);

	if (!ret)
		return ERR_PTR(-ENOMEM);

	err = 0;
	clnt = fid->clnt;

	req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
	}

	err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
	if (err) {
1756
		trace_9p_protocol_dump(clnt, req->rc);
1757 1758 1759 1760
		p9_free_req(clnt, req);
		goto error;
	}

1761
	p9_debug(P9_DEBUG_9P,
1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772
		"<<< RGETATTR st_result_mask=%lld\n"
		"<<< qid=%x.%llx.%x\n"
		"<<< st_mode=%8.8x st_nlink=%llu\n"
		"<<< st_uid=%d st_gid=%d\n"
		"<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
		"<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
		"<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
		"<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
		"<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
		"<<< st_gen=%lld st_data_version=%lld",
		ret->st_result_mask, ret->qid.type, ret->qid.path,
1773 1774 1775 1776
		ret->qid.version, ret->st_mode, ret->st_nlink,
		from_kuid(&init_user_ns, ret->st_uid),
		from_kgid(&init_user_ns, ret->st_gid),
		ret->st_rdev, ret->st_size, ret->st_blksize,
1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790
		ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
		ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
		ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
		ret->st_gen, ret->st_data_version);

	p9_free_req(clnt, req);
	return ret;

error:
	kfree(ret);
	return ERR_PTR(err);
}
EXPORT_SYMBOL(p9_client_getattr_dotl);

1791
static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1792 1793 1794
{
	int ret;

1795
	/* NOTE: size shouldn't include its own length */
1796 1797 1798
	/* size[2] type[2] dev[4] qid[13] */
	/* mode[4] atime[4] mtime[4] length[8]*/
	/* name[s] uid[s] gid[s] muid[s] */
1799
	ret = 2+4+13+4+4+4+8+2+2+2+2;
1800 1801 1802 1803 1804 1805 1806 1807 1808 1809

	if (wst->name)
		ret += strlen(wst->name);
	if (wst->uid)
		ret += strlen(wst->uid);
	if (wst->gid)
		ret += strlen(wst->gid);
	if (wst->muid)
		ret += strlen(wst->muid);

1810 1811
	if ((proto_version == p9_proto_2000u) ||
		(proto_version == p9_proto_2000L)) {
1812 1813 1814 1815 1816 1817 1818 1819
		ret += 2+4+4+4;	/* extension[s] n_uid[4] n_gid[4] n_muid[4] */
		if (wst->extension)
			ret += strlen(wst->extension);
	}

	return ret;
}

1820 1821 1822
int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
{
	int err;
1823
	struct p9_req_t *req;
1824 1825
	struct p9_client *clnt;

1826 1827
	err = 0;
	clnt = fid->clnt;
1828
	wst->size = p9_client_statsize(wst, clnt->proto_version);
1829 1830
	p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
	p9_debug(P9_DEBUG_9P,
E
Eric Van Hensbergen 已提交
1831 1832 1833 1834 1835
		"     sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
		"     mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
		"     name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
		"     uid=%d gid=%d n_muid=%d\n",
		wst->size, wst->type, wst->dev, wst->qid.type,
R
Randy Dunlap 已提交
1836 1837 1838
		(unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
		wst->atime, wst->mtime, (unsigned long long)wst->length,
		wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1839 1840 1841
		from_kuid(&init_user_ns, wst->n_uid),
		from_kgid(&init_user_ns, wst->n_gid),
		from_kuid(&init_user_ns, wst->n_muid));
1842

1843
	req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1844 1845 1846
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
1847 1848
	}

1849
	p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1850

1851 1852
	p9_free_req(clnt, req);
error:
1853 1854 1855
	return err;
}
EXPORT_SYMBOL(p9_client_wstat);
1856

1857 1858 1859 1860 1861 1862 1863 1864
int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
{
	int err;
	struct p9_req_t *req;
	struct p9_client *clnt;

	err = 0;
	clnt = fid->clnt;
1865 1866
	p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
	p9_debug(P9_DEBUG_9P,
1867 1868 1869
		"    valid=%x mode=%x uid=%d gid=%d size=%lld\n"
		"    atime_sec=%lld atime_nsec=%lld\n"
		"    mtime_sec=%lld mtime_nsec=%lld\n",
1870 1871 1872
		p9attr->valid, p9attr->mode,
		from_kuid(&init_user_ns, p9attr->uid),
		from_kgid(&init_user_ns, p9attr->gid),
1873 1874 1875 1876 1877 1878 1879 1880 1881
		p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
		p9attr->mtime_sec, p9attr->mtime_nsec);

	req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);

	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
	}
1882
	p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1883 1884 1885 1886 1887 1888
	p9_free_req(clnt, req);
error:
	return err;
}
EXPORT_SYMBOL(p9_client_setattr);

1889 1890 1891 1892 1893 1894 1895 1896 1897
int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
{
	int err;
	struct p9_req_t *req;
	struct p9_client *clnt;

	err = 0;
	clnt = fid->clnt;

1898
	p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909

	req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
	}

	err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
		&sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
		&sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
	if (err) {
1910
		trace_9p_protocol_dump(clnt, req->rc);
1911 1912 1913 1914
		p9_free_req(clnt, req);
		goto error;
	}

1915
	p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926
		"blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
		"fsid %llu namelen %ld\n",
		fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
		sb->blocks, sb->bfree, sb->bavail, sb->files,  sb->ffree,
		sb->fsid, (long int)sb->namelen);

	p9_free_req(clnt, req);
error:
	return err;
}
EXPORT_SYMBOL(p9_client_statfs);
1927

1928 1929
int p9_client_rename(struct p9_fid *fid,
		     struct p9_fid *newdirfid, const char *name)
1930 1931 1932 1933 1934 1935 1936 1937
{
	int err;
	struct p9_req_t *req;
	struct p9_client *clnt;

	err = 0;
	clnt = fid->clnt;

1938
	p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1939 1940 1941 1942 1943 1944 1945 1946 1947
			fid->fid, newdirfid->fid, name);

	req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
			newdirfid->fid, name);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
	}

1948
	p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1949 1950 1951 1952 1953 1954 1955

	p9_free_req(clnt, req);
error:
	return err;
}
EXPORT_SYMBOL(p9_client_rename);

1956 1957 1958 1959 1960 1961 1962 1963 1964 1965
int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
		       struct p9_fid *newdirfid, const char *new_name)
{
	int err;
	struct p9_req_t *req;
	struct p9_client *clnt;

	err = 0;
	clnt = olddirfid->clnt;

1966
	p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1967 1968 1969 1970 1971 1972 1973 1974 1975 1976
		   " newdirfid %d new name %s\n", olddirfid->fid, old_name,
		   newdirfid->fid, new_name);

	req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
			    old_name, newdirfid->fid, new_name);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
	}

1977
	p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1978 1979 1980 1981 1982 1983 1984 1985
		   newdirfid->fid, new_name);

	p9_free_req(clnt, req);
error:
	return err;
}
EXPORT_SYMBOL(p9_client_renameat);

1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004
/*
 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
 */
struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
				const char *attr_name, u64 *attr_size)
{
	int err;
	struct p9_req_t *req;
	struct p9_client *clnt;
	struct p9_fid *attr_fid;

	err = 0;
	clnt = file_fid->clnt;
	attr_fid = p9_fid_create(clnt);
	if (IS_ERR(attr_fid)) {
		err = PTR_ERR(attr_fid);
		attr_fid = NULL;
		goto error;
	}
2005
	p9_debug(P9_DEBUG_9P,
2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
		">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
		file_fid->fid, attr_fid->fid, attr_name);

	req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
			file_fid->fid, attr_fid->fid, attr_name);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
	}
	err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
	if (err) {
2017
		trace_9p_protocol_dump(clnt, req->rc);
2018 2019 2020 2021
		p9_free_req(clnt, req);
		goto clunk_fid;
	}
	p9_free_req(clnt, req);
2022
	p9_debug(P9_DEBUG_9P, "<<<  RXATTRWALK fid %d size %llu\n",
2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035
		attr_fid->fid, *attr_size);
	return attr_fid;
clunk_fid:
	p9_client_clunk(attr_fid);
	attr_fid = NULL;
error:
	if (attr_fid && (attr_fid != file_fid))
		p9_fid_destroy(attr_fid);

	return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(p9_client_xattrwalk);

2036 2037 2038 2039 2040 2041 2042
int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
			u64 attr_size, int flags)
{
	int err;
	struct p9_req_t *req;
	struct p9_client *clnt;

2043
	p9_debug(P9_DEBUG_9P,
2044 2045 2046 2047 2048 2049 2050 2051 2052 2053
		">>> TXATTRCREATE fid %d name  %s size %lld flag %d\n",
		fid->fid, name, (long long)attr_size, flags);
	err = 0;
	clnt = fid->clnt;
	req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
			fid->fid, name, attr_size, flags);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
	}
2054
	p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2055 2056 2057 2058 2059 2060
	p9_free_req(clnt, req);
error:
	return err;
}
EXPORT_SYMBOL_GPL(p9_client_xattrcreate);

2061 2062
int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
{
2063
	int err, rsize, non_zc = 0;
2064 2065 2066 2067
	struct p9_client *clnt;
	struct p9_req_t *req;
	char *dataptr;

2068
	p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2069
				fid->fid, (unsigned long long) offset, count);
2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080

	err = 0;
	clnt = fid->clnt;

	rsize = fid->iounit;
	if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
		rsize = clnt->msize - P9_READDIRHDRSZ;

	if (count < rsize)
		rsize = count;

2081 2082 2083 2084 2085 2086 2087 2088
	/* Don't bother zerocopy for small IO (< 1024) */
	if (clnt->trans_mod->zc_request && rsize > 1024) {
		/*
		 * response header len is 11
		 * PDU Header(7) + IO Size (4)
		 */
		req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
				       11, 1, "dqd", fid->fid, offset, rsize);
2089
	} else {
2090
		non_zc = 1;
2091
		req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2092
				    offset, rsize);
2093
	}
2094 2095 2096 2097 2098 2099 2100
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto error;
	}

	err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
	if (err) {
2101
		trace_9p_protocol_dump(clnt, req->rc);
2102 2103 2104
		goto free_and_error;
	}

2105
	p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2106

2107
	if (non_zc)
2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118
		memmove(data, dataptr, count);

	p9_free_req(clnt, req);
	return count;

free_and_error:
	p9_free_req(clnt, req);
error:
	return err;
}
EXPORT_SYMBOL(p9_client_readdir);
M
M. Mohan Kumar 已提交
2119 2120

int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2121
			dev_t rdev, kgid_t gid, struct p9_qid *qid)
M
M. Mohan Kumar 已提交
2122 2123 2124 2125 2126 2127 2128
{
	int err;
	struct p9_client *clnt;
	struct p9_req_t *req;

	err = 0;
	clnt = fid->clnt;
2129
	p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
M
M. Mohan Kumar 已提交
2130
		"minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2131
	req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
M
M. Mohan Kumar 已提交
2132 2133 2134 2135 2136 2137
		MAJOR(rdev), MINOR(rdev), gid);
	if (IS_ERR(req))
		return PTR_ERR(req);

	err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
	if (err) {
2138
		trace_9p_protocol_dump(clnt, req->rc);
M
M. Mohan Kumar 已提交
2139 2140
		goto error;
	}
2141
	p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
M
M. Mohan Kumar 已提交
2142 2143 2144 2145 2146 2147 2148 2149
				(unsigned long long)qid->path, qid->version);

error:
	p9_free_req(clnt, req);
	return err;

}
EXPORT_SYMBOL(p9_client_mknod_dotl);
M
M. Mohan Kumar 已提交
2150 2151

int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2152
				kgid_t gid, struct p9_qid *qid)
M
M. Mohan Kumar 已提交
2153 2154 2155 2156 2157 2158 2159
{
	int err;
	struct p9_client *clnt;
	struct p9_req_t *req;

	err = 0;
	clnt = fid->clnt;
2160
	p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2161 2162
		 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
	req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
M
M. Mohan Kumar 已提交
2163 2164 2165 2166 2167 2168
		gid);
	if (IS_ERR(req))
		return PTR_ERR(req);

	err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
	if (err) {
2169
		trace_9p_protocol_dump(clnt, req->rc);
M
M. Mohan Kumar 已提交
2170 2171
		goto error;
	}
2172
	p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
M
M. Mohan Kumar 已提交
2173 2174 2175 2176 2177 2178 2179 2180
				(unsigned long long)qid->path, qid->version);

error:
	p9_free_req(clnt, req);
	return err;

}
EXPORT_SYMBOL(p9_client_mkdir_dotl);
M
M. Mohan Kumar 已提交
2181 2182 2183 2184 2185 2186 2187 2188 2189

int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
{
	int err;
	struct p9_client *clnt;
	struct p9_req_t *req;

	err = 0;
	clnt = fid->clnt;
2190
	p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
M
M. Mohan Kumar 已提交
2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203
			"start %lld length %lld proc_id %d client_id %s\n",
			fid->fid, flock->type, flock->flags, flock->start,
			flock->length, flock->proc_id, flock->client_id);

	req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
				flock->flags, flock->start, flock->length,
					flock->proc_id, flock->client_id);

	if (IS_ERR(req))
		return PTR_ERR(req);

	err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
	if (err) {
2204
		trace_9p_protocol_dump(clnt, req->rc);
M
M. Mohan Kumar 已提交
2205 2206
		goto error;
	}
2207
	p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
M
M. Mohan Kumar 已提交
2208 2209 2210 2211 2212 2213
error:
	p9_free_req(clnt, req);
	return err;

}
EXPORT_SYMBOL(p9_client_lock_dotl);
M
M. Mohan Kumar 已提交
2214 2215 2216 2217 2218 2219 2220 2221 2222

int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
{
	int err;
	struct p9_client *clnt;
	struct p9_req_t *req;

	err = 0;
	clnt = fid->clnt;
2223
	p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
M
M. Mohan Kumar 已提交
2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236
		"length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
		glock->start, glock->length, glock->proc_id, glock->client_id);

	req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid,  glock->type,
		glock->start, glock->length, glock->proc_id, glock->client_id);

	if (IS_ERR(req))
		return PTR_ERR(req);

	err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
			&glock->start, &glock->length, &glock->proc_id,
			&glock->client_id);
	if (err) {
2237
		trace_9p_protocol_dump(clnt, req->rc);
M
M. Mohan Kumar 已提交
2238 2239
		goto error;
	}
2240
	p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
M
M. Mohan Kumar 已提交
2241 2242 2243 2244 2245 2246 2247
		"proc_id %d client_id %s\n", glock->type, glock->start,
		glock->length, glock->proc_id, glock->client_id);
error:
	p9_free_req(clnt, req);
	return err;
}
EXPORT_SYMBOL(p9_client_getlock_dotl);
2248 2249 2250 2251 2252 2253 2254 2255 2256

int p9_client_readlink(struct p9_fid *fid, char **target)
{
	int err;
	struct p9_client *clnt;
	struct p9_req_t *req;

	err = 0;
	clnt = fid->clnt;
2257
	p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2258 2259 2260 2261 2262 2263 2264

	req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
	if (IS_ERR(req))
		return PTR_ERR(req);

	err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
	if (err) {
2265
		trace_9p_protocol_dump(clnt, req->rc);
2266 2267
		goto error;
	}
2268
	p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2269 2270 2271 2272 2273
error:
	p9_free_req(clnt, req);
	return err;
}
EXPORT_SYMBOL(p9_client_readlink);