9p: Reorganization of 9p file system code

This patchset moves non-filesystem interfaces of v9fs from fs/9p to net/9p.
It moves the transport, packet marshalling and connection layers to net/9p
leaving only the VFS related files in fs/9p.  This work is being done in
preparation for in-kernel 9p servers as well as alternate 9p clients (other
than VFS).

Signed-off-by: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

fs/9p/9p.h

@@ -1,375 +0,0 @@
-/*
- * linux/fs/9p/9p.h
- *
- * 9P protocol definitions.
- *
- *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
- *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
- *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
- *
- *  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
- *
- */
-
-/* Message Types */
-enum {
-	TVERSION = 100,
-	RVERSION,
-	TAUTH = 102,
-	RAUTH,
-	TATTACH = 104,
-	RATTACH,
-	TERROR = 106,
-	RERROR,
-	TFLUSH = 108,
-	RFLUSH,
-	TWALK = 110,
-	RWALK,
-	TOPEN = 112,
-	ROPEN,
-	TCREATE = 114,
-	RCREATE,
-	TREAD = 116,
-	RREAD,
-	TWRITE = 118,
-	RWRITE,
-	TCLUNK = 120,
-	RCLUNK,
-	TREMOVE = 122,
-	RREMOVE,
-	TSTAT = 124,
-	RSTAT,
-	TWSTAT = 126,
-	RWSTAT,
-};
-
-/* modes */
-enum {
-	V9FS_OREAD = 0x00,
-	V9FS_OWRITE = 0x01,
-	V9FS_ORDWR = 0x02,
-	V9FS_OEXEC = 0x03,
-	V9FS_OEXCL = 0x04,
-	V9FS_OTRUNC = 0x10,
-	V9FS_OREXEC = 0x20,
-	V9FS_ORCLOSE = 0x40,
-	V9FS_OAPPEND = 0x80,
-};
-
-/* permissions */
-enum {
-	V9FS_DMDIR = 0x80000000,
-	V9FS_DMAPPEND = 0x40000000,
-	V9FS_DMEXCL = 0x20000000,
-	V9FS_DMMOUNT = 0x10000000,
-	V9FS_DMAUTH = 0x08000000,
-	V9FS_DMTMP = 0x04000000,
-	V9FS_DMSYMLINK = 0x02000000,
-	V9FS_DMLINK = 0x01000000,
-	/* 9P2000.u extensions */
-	V9FS_DMDEVICE = 0x00800000,
-	V9FS_DMNAMEDPIPE = 0x00200000,
-	V9FS_DMSOCKET = 0x00100000,
-	V9FS_DMSETUID = 0x00080000,
-	V9FS_DMSETGID = 0x00040000,
-};
-
-/* qid.types */
-enum {
-	V9FS_QTDIR = 0x80,
-	V9FS_QTAPPEND = 0x40,
-	V9FS_QTEXCL = 0x20,
-	V9FS_QTMOUNT = 0x10,
-	V9FS_QTAUTH = 0x08,
-	V9FS_QTTMP = 0x04,
-	V9FS_QTSYMLINK = 0x02,
-	V9FS_QTLINK = 0x01,
-	V9FS_QTFILE = 0x00,
-};
-
-#define V9FS_NOTAG	(u16)(~0)
-#define V9FS_NOFID	(u32)(~0)
-#define V9FS_MAXWELEM	16
-
-/* ample room for Twrite/Rread header (iounit) */
-#define V9FS_IOHDRSZ	24
-
-struct v9fs_str {
-	u16 len;
-	char *str;
-};
-
-/* qids are the unique ID for a file (like an inode */
-struct v9fs_qid {
-	u8 type;
-	u32 version;
-	u64 path;
-};
-
-/* Plan 9 file metadata (stat) structure */
-struct v9fs_stat {
-	u16 size;
-	u16 type;
-	u32 dev;
-	struct v9fs_qid qid;
-	u32 mode;
-	u32 atime;
-	u32 mtime;
-	u64 length;
-	struct v9fs_str name;
-	struct v9fs_str uid;
-	struct v9fs_str gid;
-	struct v9fs_str muid;
-	struct v9fs_str extension;	/* 9p2000.u extensions */
-	u32 n_uid;		/* 9p2000.u extensions */
-	u32 n_gid;		/* 9p2000.u extensions */
-	u32 n_muid;		/* 9p2000.u extensions */
-};
-
-/* file metadata (stat) structure used to create Twstat message
-   The is similar to v9fs_stat, but the strings don't point to
-   the same memory block and should be freed separately
-*/
-struct v9fs_wstat {
-	u16 size;
-	u16 type;
-	u32 dev;
-	struct v9fs_qid qid;
-	u32 mode;
-	u32 atime;
-	u32 mtime;
-	u64 length;
-	char *name;
-	char *uid;
-	char *gid;
-	char *muid;
-	char *extension;	/* 9p2000.u extensions */
-	u32 n_uid;		/* 9p2000.u extensions */
-	u32 n_gid;		/* 9p2000.u extensions */
-	u32 n_muid;		/* 9p2000.u extensions */
-};
-
-/* Structures for Protocol Operations */
-
-struct Tversion {
-	u32 msize;
-	struct v9fs_str version;
-};
-
-struct Rversion {
-	u32 msize;
-	struct v9fs_str version;
-};
-
-struct Tauth {
-	u32 afid;
-	struct v9fs_str uname;
-	struct v9fs_str aname;
-};
-
-struct Rauth {
-	struct v9fs_qid qid;
-};
-
-struct Rerror {
-	struct v9fs_str error;
-	u32 errno;		/* 9p2000.u extension */
-};
-
-struct Tflush {
-	u16 oldtag;
-};
-
-struct Rflush {
-};
-
-struct Tattach {
-	u32 fid;
-	u32 afid;
-	struct v9fs_str uname;
-	struct v9fs_str aname;
-};
-
-struct Rattach {
-	struct v9fs_qid qid;
-};
-
-struct Twalk {
-	u32 fid;
-	u32 newfid;
-	u16 nwname;
-	struct v9fs_str wnames[16];
-};
-
-struct Rwalk {
-	u16 nwqid;
-	struct v9fs_qid wqids[16];
-};
-
-struct Topen {
-	u32 fid;
-	u8 mode;
-};
-
-struct Ropen {
-	struct v9fs_qid qid;
-	u32 iounit;
-};
-
-struct Tcreate {
-	u32 fid;
-	struct v9fs_str name;
-	u32 perm;
-	u8 mode;
-	struct v9fs_str extension;
-};
-
-struct Rcreate {
-	struct v9fs_qid qid;
-	u32 iounit;
-};
-
-struct Tread {
-	u32 fid;
-	u64 offset;
-	u32 count;
-};
-
-struct Rread {
-	u32 count;
-	u8 *data;
-};
-
-struct Twrite {
-	u32 fid;
-	u64 offset;
-	u32 count;
-	u8 *data;
-};
-
-struct Rwrite {
-	u32 count;
-};
-
-struct Tclunk {
-	u32 fid;
-};
-
-struct Rclunk {
-};
-
-struct Tremove {
-	u32 fid;
-};
-
-struct Rremove {
-};
-
-struct Tstat {
-	u32 fid;
-};
-
-struct Rstat {
-	struct v9fs_stat stat;
-};
-
-struct Twstat {
-	u32 fid;
-	struct v9fs_stat stat;
-};
-
-struct Rwstat {
-};
-
-/*
-  * fcall is the primary packet structure
-  *
-  */
-
-struct v9fs_fcall {
-	u32 size;
-	u8 id;
-	u16 tag;
-	void *sdata;
-
-	union {
-		struct Tversion tversion;
-		struct Rversion rversion;
-		struct Tauth tauth;
-		struct Rauth rauth;
-		struct Rerror rerror;
-		struct Tflush tflush;
-		struct Rflush rflush;
-		struct Tattach tattach;
-		struct Rattach rattach;
-		struct Twalk twalk;
-		struct Rwalk rwalk;
-		struct Topen topen;
-		struct Ropen ropen;
-		struct Tcreate tcreate;
-		struct Rcreate rcreate;
-		struct Tread tread;
-		struct Rread rread;
-		struct Twrite twrite;
-		struct Rwrite rwrite;
-		struct Tclunk tclunk;
-		struct Rclunk rclunk;
-		struct Tremove tremove;
-		struct Rremove rremove;
-		struct Tstat tstat;
-		struct Rstat rstat;
-		struct Twstat twstat;
-		struct Rwstat rwstat;
-	} params;
-};
-
-#define PRINT_FCALL_ERROR(s, fcall) dprintk(DEBUG_ERROR, "%s: %.*s\n", s, \
-	fcall?fcall->params.rerror.error.len:0, \
-	fcall?fcall->params.rerror.error.str:"");
-
-int v9fs_t_version(struct v9fs_session_info *v9ses, u32 msize,
-		   char *version, struct v9fs_fcall **rcall);
-
-int v9fs_t_attach(struct v9fs_session_info *v9ses, char *uname, char *aname,
-		  u32 fid, u32 afid, struct v9fs_fcall **rcall);
-
-int v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid);
-
-int v9fs_t_stat(struct v9fs_session_info *v9ses, u32 fid,
-		struct v9fs_fcall **rcall);
-
-int v9fs_t_wstat(struct v9fs_session_info *v9ses, u32 fid,
-		 struct v9fs_wstat *wstat, struct v9fs_fcall **rcall);
-
-int v9fs_t_walk(struct v9fs_session_info *v9ses, u32 fid, u32 newfid,
-		char *name, struct v9fs_fcall **rcall);
-
-int v9fs_t_open(struct v9fs_session_info *v9ses, u32 fid, u8 mode,
-		struct v9fs_fcall **rcall);
-
-int v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid,
-		  struct v9fs_fcall **rcall);
-
-int v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name,
-	u32 perm, u8 mode, char *extension, struct v9fs_fcall **rcall);
-
-int v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid,
-		u64 offset, u32 count, struct v9fs_fcall **rcall);
-
-int v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid, u64 offset,
-		 u32 count, const char __user * data,
-		 struct v9fs_fcall **rcall);
-int v9fs_printfcall(char *, int, struct v9fs_fcall *, int);

fs/9p/Makefile

@@ -1,18 +1,12 @@
 obj-$(CONFIG_9P_FS) := 9p.o
 
 9p-objs := \
-	trans_fd.o \
-	mux.o \
-	fcall.o \
-	conv.o \
 	vfs_super.o \
 	vfs_inode.o \
 	vfs_addr.o \
 	vfs_file.o \
 	vfs_dir.o \
 	vfs_dentry.o \
-	error.o \
 	v9fs.o \
 	fid.o \
-	fcprint.o
 

fs/9p/conv.h

@@ -1,50 +0,0 @@
-/*
- * linux/fs/9p/conv.h
- *
- * 9P protocol conversion definitions.
- *
- *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
- *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
- *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
- *
- *  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
- *
- */
-
-int v9fs_deserialize_stat(void *buf, u32 buflen, struct v9fs_stat *stat,
-	int extended);
-int v9fs_deserialize_fcall(void *buf, u32 buflen, struct v9fs_fcall *rcall,
-	int extended);
-
-void v9fs_set_tag(struct v9fs_fcall *fc, u16 tag);
-
-struct v9fs_fcall *v9fs_create_tversion(u32 msize, char *version);
-struct v9fs_fcall *v9fs_create_tattach(u32 fid, u32 afid, char *uname,
-	char *aname);
-struct v9fs_fcall *v9fs_create_tflush(u16 oldtag);
-struct v9fs_fcall *v9fs_create_twalk(u32 fid, u32 newfid, u16 nwname,
-	char **wnames);
-struct v9fs_fcall *v9fs_create_topen(u32 fid, u8 mode);
-struct v9fs_fcall *v9fs_create_tcreate(u32 fid, char *name, u32 perm, u8 mode,
-	char *extension, int extended);
-struct v9fs_fcall *v9fs_create_tread(u32 fid, u64 offset, u32 count);
-struct v9fs_fcall *v9fs_create_twrite(u32 fid, u64 offset, u32 count,
-	const char __user *data);
-struct v9fs_fcall *v9fs_create_tclunk(u32 fid);
-struct v9fs_fcall *v9fs_create_tremove(u32 fid);
-struct v9fs_fcall *v9fs_create_tstat(u32 fid);
-struct v9fs_fcall *v9fs_create_twstat(u32 fid, struct v9fs_wstat *wstat,
-	int extended);

fs/9p/debug.h

@@ -1,77 +0,0 @@
-/*
- *  linux/fs/9p/debug.h - V9FS Debug Definitions
- *
- *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
- *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
- *
- *  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
- *
- */
-
-#define DEBUG_ERROR		(1<<0)
-#define DEBUG_CURRENT		(1<<1)
-#define DEBUG_9P	        (1<<2)
-#define DEBUG_VFS	        (1<<3)
-#define DEBUG_CONV		(1<<4)
-#define DEBUG_MUX		(1<<5)
-#define DEBUG_TRANS		(1<<6)
-#define DEBUG_SLABS	      	(1<<7)
-#define DEBUG_FCALL		(1<<8)
-
-#define DEBUG_DUMP_PKT		0
-
-extern int v9fs_debug_level;
-
-#define dprintk(level, format, arg...) \
-do {  \
-	if((v9fs_debug_level & level)==level) \
-		printk(KERN_NOTICE "-- %s (%d): " \
-		format , __FUNCTION__, current->pid , ## arg); \
-} while(0)
-
-#define eprintk(level, format, arg...) \
-do { \
-	printk(level "v9fs: %s (%d): " \
-		format , __FUNCTION__, current->pid , ## arg); \
-} while(0)
-
-#if DEBUG_DUMP_PKT
-static inline void dump_data(const unsigned char *data, unsigned int datalen)
-{
-	int i, n;
-	char buf[5*8];
-
-	n = 0;
-	i = 0;
-	while (i < datalen) {
-		n += snprintf(buf+n, sizeof(buf)-n, "%02x", data[i++]);
-		if (i%4 == 0)
-			n += snprintf(buf+n, sizeof(buf)-n, " ");
-
-		if (i%16 == 0) {
-			dprintk(DEBUG_ERROR, "%s\n", buf);
-			n = 0;
-		}
-	}
-
-	dprintk(DEBUG_ERROR, "%s\n", buf);
-}
-#else				/* DEBUG_DUMP_PKT */
-static inline void dump_data(const unsigned char *data, unsigned int datalen)
-{
-
-}
-#endif				/* DEBUG_DUMP_PKT */

fs/9p/error.c

@@ -1,93 +0,0 @@
-/*
- * linux/fs/9p/error.c
- *
- * Error string handling
- *
- * Plan 9 uses error strings, Unix uses error numbers.  These functions
- * try to help manage that and provide for dynamically adding error
- * mappings.
- *
- *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
- *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
- *
- *  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/list.h>
-#include <linux/jhash.h>
-
-#include "debug.h"
-#include "error.h"
-
-/**
- * v9fs_error_init - preload
- * @errstr: error string
- *
- */
-
-int v9fs_error_init(void)
-{
-	struct errormap *c;
-	int bucket;
-
-	/* initialize hash table */
-	for (bucket = 0; bucket < ERRHASHSZ; bucket++)
-		INIT_HLIST_HEAD(&hash_errmap[bucket]);
-
-	/* load initial error map into hash table */
-	for (c = errmap; c->name != NULL; c++) {
-		c->namelen = strlen(c->name);
-		bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
-		INIT_HLIST_NODE(&c->list);
-		hlist_add_head(&c->list, &hash_errmap[bucket]);
-	}
-
-	return 1;
-}
-
-/**
- * errstr2errno - convert error string to error number
- * @errstr: error string
- *
- */
-
-int v9fs_errstr2errno(char *errstr, int len)
-{
-	int errno = 0;
-	struct hlist_node *p = NULL;
-	struct errormap *c = NULL;
-	int bucket = jhash(errstr, len, 0) % ERRHASHSZ;
-
-	hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
-		if (c->namelen==len && !memcmp(c->name, errstr, len)) {
-			errno = c->val;
-			break;
-		}
-	}
-
-	if (errno == 0) {
-		/* TODO: if error isn't found, add it dynamically */
-		errstr[len] = 0;
-		printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__,
-		       errstr);
-		errno = 1;
-	}
-
-	return -errno;
-}

fs/9p/fcall.c

@@ -1,427 +0,0 @@
-/*
- *  linux/fs/9p/fcall.c
- *
- *  This file contains functions to perform synchronous 9P calls
- *
- *  Copyright (C) 2004 by Latchesar Ionkov <lucho@ionkov.net>
- *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
- *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
- *
- *  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/sched.h>
-#include <linux/idr.h>
-
-#include "debug.h"
-#include "v9fs.h"
-#include "9p.h"
-#include "conv.h"
-#include "mux.h"
-
-/**
- * v9fs_t_version - negotiate protocol parameters with sever
- * @v9ses: 9P2000 session information
- * @msize: requested max size packet
- * @version: requested version.extension string
- * @fcall: pointer to response fcall pointer
- *
- */
-
-int
-v9fs_t_version(struct v9fs_session_info *v9ses, u32 msize,
-	       char *version, struct v9fs_fcall **rcp)
-{
-	int ret;
-	struct v9fs_fcall *tc;
-
-	dprintk(DEBUG_9P, "msize: %d version: %s\n", msize, version);
-	tc = v9fs_create_tversion(msize, version);
-
-	if (!IS_ERR(tc)) {
-		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
-		kfree(tc);
-	} else
-		ret = PTR_ERR(tc);
-
-	return ret;
-}
-
-/**
- * v9fs_t_attach - mount the server
- * @v9ses: 9P2000 session information
- * @uname: user name doing the attach
- * @aname: remote name being attached to
- * @fid: mount fid to attatch to root node
- * @afid: authentication fid (in this case result key)
- * @fcall: pointer to response fcall pointer
- *
- */
-
-int
-v9fs_t_attach(struct v9fs_session_info *v9ses, char *uname, char *aname,
-	      u32 fid, u32 afid, struct v9fs_fcall **rcp)
-{
-	int ret;
-	struct v9fs_fcall* tc;
-
-	dprintk(DEBUG_9P, "uname '%s' aname '%s' fid %d afid %d\n", uname,
-		aname, fid, afid);
-
-	tc = v9fs_create_tattach(fid, afid, uname, aname);
-	if (!IS_ERR(tc)) {
-		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
-		kfree(tc);
-	} else
-		ret = PTR_ERR(tc);
-
-	return ret;
-}
-
-static void v9fs_t_clunk_cb(void *a, struct v9fs_fcall *tc,
-	struct v9fs_fcall *rc, int err)
-{
-	int fid, id;
-	struct v9fs_session_info *v9ses;
-
-	id = 0;
-	fid = tc->params.tclunk.fid;
-	if (rc)
-		id = rc->id;
-
-	kfree(tc);
-	kfree(rc);
-	if (id == RCLUNK) {
-		v9ses = a;
-		v9fs_put_idpool(fid, &v9ses->fidpool);
-	}
-}
-
-/**
- * v9fs_t_clunk - release a fid (finish a transaction)
- * @v9ses: 9P2000 session information
- * @fid: fid to release
- * @fcall: pointer to response fcall pointer
- *
- */
-
-int
-v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid)
-{
-	int ret;
-	struct v9fs_fcall *tc, *rc;
-
-	dprintk(DEBUG_9P, "fid %d\n", fid);
-
-	rc = NULL;
-	tc = v9fs_create_tclunk(fid);
-	if (!IS_ERR(tc))
-		ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
-	else
-		ret = PTR_ERR(tc);
-
-	if (ret)
-		dprintk(DEBUG_ERROR, "failed fid %d err %d\n", fid, ret);
-
-	v9fs_t_clunk_cb(v9ses, tc, rc, ret);
-	return ret;
-}
-
-#if 0
-/**
- * v9fs_v9fs_t_flush - flush a pending transaction
- * @v9ses: 9P2000 session information
- * @tag: tag to release
- *
- */
-int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 oldtag)
-{
-	int ret;
-	struct v9fs_fcall *tc;
-
-	dprintk(DEBUG_9P, "oldtag %d\n", oldtag);
-
-	tc = v9fs_create_tflush(oldtag);
-	if (!IS_ERR(tc)) {
-		ret = v9fs_mux_rpc(v9ses->mux, tc, NULL);
-		kfree(tc);
-	} else
-		ret = PTR_ERR(tc);
-
-	return ret;
-}
-#endif
-
-/**
- * v9fs_t_stat - read a file's meta-data
- * @v9ses: 9P2000 session information
- * @fid: fid pointing to file or directory to get info about
- * @fcall: pointer to response fcall
- *
- */
-
-int
-v9fs_t_stat(struct v9fs_session_info *v9ses, u32 fid, struct v9fs_fcall **rcp)
-{
-	int ret;
-	struct v9fs_fcall *tc;
-
-	dprintk(DEBUG_9P, "fid %d\n", fid);
-
-	ret = -ENOMEM;
-	tc = v9fs_create_tstat(fid);
-	if (!IS_ERR(tc)) {
-		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
-		kfree(tc);
-	} else
-		ret = PTR_ERR(tc);
-
-	return ret;
-}
-
-/**
- * v9fs_t_wstat - write a file's meta-data
- * @v9ses: 9P2000 session information
- * @fid: fid pointing to file or directory to write info about
- * @stat: metadata
- * @fcall: pointer to response fcall
- *
- */
-
-int
-v9fs_t_wstat(struct v9fs_session_info *v9ses, u32 fid,
-	     struct v9fs_wstat *wstat, struct v9fs_fcall **rcp)
-{
-	int ret;
-	struct v9fs_fcall *tc;
-
-	dprintk(DEBUG_9P, "fid %d\n", fid);
-
-	tc = v9fs_create_twstat(fid, wstat, v9ses->extended);
-	if (!IS_ERR(tc)) {
-		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
-		kfree(tc);
-	} else
-		ret = PTR_ERR(tc);
-
-	return ret;
-}
-
-/**
- * v9fs_t_walk - walk a fid to a new file or directory
- * @v9ses: 9P2000 session information
- * @fid: fid to walk
- * @newfid: new fid (for clone operations)
- * @name: path to walk fid to
- * @fcall: pointer to response fcall
- *
- */
-
-/* TODO: support multiple walk */
-
-int
-v9fs_t_walk(struct v9fs_session_info *v9ses, u32 fid, u32 newfid,
-	    char *name, struct v9fs_fcall **rcp)
-{
-	int ret;
-	struct v9fs_fcall *tc;
-	int nwname;
-
-	dprintk(DEBUG_9P, "fid %d newfid %d wname '%s'\n", fid, newfid, name);
-
-	if (name)
-		nwname = 1;
-	else
-		nwname = 0;
-
-	tc = v9fs_create_twalk(fid, newfid, nwname, &name);
-	if (!IS_ERR(tc)) {
-		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
-		kfree(tc);
-	} else
-		ret = PTR_ERR(tc);
-
-	return ret;
-}
-
-/**
- * v9fs_t_open - open a file
- *
- * @v9ses - 9P2000 session information
- * @fid - fid to open
- * @mode - mode to open file (R, RW, etc)
- * @fcall - pointer to response fcall
- *
- */
-
-int
-v9fs_t_open(struct v9fs_session_info *v9ses, u32 fid, u8 mode,
-	    struct v9fs_fcall **rcp)
-{
-	int ret;
-	struct v9fs_fcall *tc;
-
-	dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode);
-
-	tc = v9fs_create_topen(fid, mode);
-	if (!IS_ERR(tc)) {
-		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
-		kfree(tc);
-	} else
-		ret = PTR_ERR(tc);
-
-	return ret;
-}
-
-/**
- * v9fs_t_remove - remove a file or directory
- * @v9ses: 9P2000 session information
- * @fid: fid to remove
- * @fcall: pointer to response fcall
- *
- */
-
-int
-v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid,
-	      struct v9fs_fcall **rcp)
-{
-	int ret;
-	struct v9fs_fcall *tc;
-
-	dprintk(DEBUG_9P, "fid %d\n", fid);
-
-	tc = v9fs_create_tremove(fid);
-	if (!IS_ERR(tc)) {
-		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
-		kfree(tc);
-	} else
-		ret = PTR_ERR(tc);
-
-	return ret;
-}
-
-/**
- * v9fs_t_create - create a file or directory
- * @v9ses: 9P2000 session information
- * @fid: fid to create
- * @name: name of the file or directory to create
- * @perm: permissions to create with
- * @mode: mode to open file (R, RW, etc)
- * @fcall: pointer to response fcall
- *
- */
-
-int
-v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name, u32 perm,
-	u8 mode, char *extension, struct v9fs_fcall **rcp)
-{
-	int ret;
-	struct v9fs_fcall *tc;
-
-	dprintk(DEBUG_9P, "fid %d name '%s' perm %x mode %d\n",
-		fid, name, perm, mode);
-
-	tc = v9fs_create_tcreate(fid, name, perm, mode, extension,
-		v9ses->extended);
-
-	if (!IS_ERR(tc)) {
-		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
-		kfree(tc);
-	} else
-		ret = PTR_ERR(tc);
-
-	return ret;
-}
-
-/**
- * v9fs_t_read - read data
- * @v9ses: 9P2000 session information
- * @fid: fid to read from
- * @offset: offset to start read at
- * @count: how many bytes to read
- * @fcall: pointer to response fcall (with data)
- *
- */
-
-int
-v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid, u64 offset,
-	    u32 count, struct v9fs_fcall **rcp)
-{
-	int ret;
-	struct v9fs_fcall *tc, *rc;
-
-	dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
-		(long long unsigned) offset, count);
-
-	tc = v9fs_create_tread(fid, offset, count);
-	if (!IS_ERR(tc)) {
-		ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
-		if (!ret)
-			ret = rc->params.rread.count;
-		if (rcp)
-			*rcp = rc;
-		else
-			kfree(rc);
-
-		kfree(tc);
-	} else
-		ret = PTR_ERR(tc);
-
-	return ret;
-}
-
-/**
- * v9fs_t_write - write data
- * @v9ses: 9P2000 session information
- * @fid: fid to write to
- * @offset: offset to start write at
- * @count: how many bytes to write
- * @fcall: pointer to response fcall
- *
- */
-
-int
-v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid, u64 offset, u32 count,
-	const char __user *data, struct v9fs_fcall **rcp)
-{
-	int ret;
-	struct v9fs_fcall *tc, *rc;
-
-	dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
-		(long long unsigned) offset, count);
-
-	tc = v9fs_create_twrite(fid, offset, count, data);
-	if (!IS_ERR(tc)) {
-		ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
-
-		if (!ret)
-			ret = rc->params.rwrite.count;
-		if (rcp)
-			*rcp = rc;
-		else
-			kfree(rc);
-
-		kfree(tc);
-	} else
-		ret = PTR_ERR(tc);
-
-	return ret;
-}
-

fs/9p/fid.c

@@ -26,10 +26,10 @@
 #include <linux/sched.h>
 #include <linux/idr.h>
 #include <asm/semaphore.h>
+#include <net/9p/9p.h>
+#include <net/9p/client.h>
 
-#include "debug.h"
 #include "v9fs.h"
-#include "9p.h"
 #include "v9fs_vfs.h"
 #include "fid.h"
 
@@ -40,67 +40,29 @@
  *
  */
 
-int v9fs_fid_insert(struct v9fs_fid *fid, struct dentry *dentry)
+int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid)
 {
-	struct list_head *fid_list = (struct list_head *)dentry->d_fsdata;
-	dprintk(DEBUG_9P, "fid %d (%p) dentry %s (%p)\n", fid->fid, fid,
-		dentry->d_iname, dentry);
-	if (dentry->d_fsdata == NULL) {
-		dentry->d_fsdata =
-		    kmalloc(sizeof(struct list_head), GFP_KERNEL);
-		if (dentry->d_fsdata == NULL) {
-			dprintk(DEBUG_ERROR, "Out of memory\n");
-			return -ENOMEM;
-		}
-		fid_list = (struct list_head *)dentry->d_fsdata;
-		INIT_LIST_HEAD(fid_list);	/* Initialize list head */
-	}
+	struct v9fs_dentry *dent;
 
-	fid->uid = current->uid;
-	list_add(&fid->list, fid_list);
-	return 0;
-}
+	P9_DPRINTK(P9_DEBUG_VFS, "fid %d dentry %s\n",
+					fid->fid, dentry->d_iname);
 
-/**
- * v9fs_fid_create - allocate a FID structure
- * @dentry - dentry to link newly created fid to
- *
- */
-
-struct v9fs_fid *v9fs_fid_create(struct v9fs_session_info *v9ses, int fid)
-{
-	struct v9fs_fid *new;
+	dent = dentry->d_fsdata;
+	if (!dent) {
+		dent = kmalloc(sizeof(struct v9fs_dentry), GFP_KERNEL);
+		if (!dent)
+			return -ENOMEM;
 
-	dprintk(DEBUG_9P, "fid create fid %d\n", fid);
-	new = kmalloc(sizeof(struct v9fs_fid), GFP_KERNEL);
-	if (new == NULL) {
-		dprintk(DEBUG_ERROR, "Out of Memory\n");
-		return ERR_PTR(-ENOMEM);
+		spin_lock_init(&dent->lock);
+		INIT_LIST_HEAD(&dent->fidlist);
+		dentry->d_fsdata = dent;
 	}
 
-	new->fid = fid;
-	new->v9ses = v9ses;
-	new->fidopen = 0;
-	new->fidclunked = 0;
-	new->iounit = 0;
-	new->rdir_pos = 0;
-	new->rdir_fcall = NULL;
-	init_MUTEX(&new->lock);
-	INIT_LIST_HEAD(&new->list);
-
-	return new;
-}
-
-/**
- * v9fs_fid_destroy - deallocate a FID structure
- * @fid: fid to destroy
- *
- */
+	spin_lock(&dent->lock);
+	list_add(&fid->dlist, &dent->fidlist);
+	spin_unlock(&dent->lock);
 
-void v9fs_fid_destroy(struct v9fs_fid *fid)
-{
-	list_del(&fid->list);
-	kfree(fid);
+	return 0;
 }
 
 /**
@@ -114,30 +76,42 @@ void v9fs_fid_destroy(struct v9fs_fid *fid)
  *
  */
 
-struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry)
+struct p9_fid *v9fs_fid_lookup(struct dentry *dentry)
 {
-	struct list_head *fid_list = (struct list_head *)dentry->d_fsdata;
-	struct v9fs_fid *return_fid = NULL;
-
-	dprintk(DEBUG_9P, " dentry: %s (%p)\n", dentry->d_iname, dentry);
-
-	if (fid_list)
-		return_fid = list_entry(fid_list->next, struct v9fs_fid, list);
+	struct v9fs_dentry *dent;
+	struct p9_fid *fid;
+
+	P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+	dent = dentry->d_fsdata;
+	if (dent)
+		fid = list_entry(dent->fidlist.next, struct p9_fid, dlist);
+	else
+		fid = ERR_PTR(-EBADF);
+
+	P9_DPRINTK(P9_DEBUG_VFS, " fid: %p\n", fid);
+	return fid;
+}
 
-	if (!return_fid) {
-		dprintk(DEBUG_ERROR, "Couldn't find a fid in dentry\n");
-		return_fid = ERR_PTR(-EBADF);
+struct p9_fid *v9fs_fid_lookup_remove(struct dentry *dentry)
+{
+	struct p9_fid *fid;
+	struct v9fs_dentry *dent;
+
+	dent = dentry->d_fsdata;
+	fid = v9fs_fid_lookup(dentry);
+	if (!IS_ERR(fid)) {
+		spin_lock(&dent->lock);
+		list_del(&fid->dlist);
+		spin_unlock(&dent->lock);
 	}
 
-	if(down_interruptible(&return_fid->lock))
-		return ERR_PTR(-EINTR);
-
-	return return_fid;
+	return fid;
 }
 
+
 /**
  * v9fs_fid_clone - lookup the fid for a dentry, clone a private copy and
- * 			release it
+ * 	release it
  * @dentry: dentry to look for fid in
  *
  * find a fid in the dentry and then clone to a new private fid
@@ -146,49 +120,15 @@ struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry)
  *
  */
 
-struct v9fs_fid *v9fs_fid_clone(struct dentry *dentry)
+struct p9_fid *v9fs_fid_clone(struct dentry *dentry)
 {
-	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
-	struct v9fs_fid *base_fid, *new_fid = ERR_PTR(-EBADF);
-	struct v9fs_fcall *fcall = NULL;
-	int fid, err;
-
-	base_fid = v9fs_fid_lookup(dentry);
-
-	if(IS_ERR(base_fid))
-		return base_fid;
-
-	if(base_fid) {  /* clone fid */
-		fid = v9fs_get_idpool(&v9ses->fidpool);
-		if (fid < 0) {
-			eprintk(KERN_WARNING, "newfid fails!\n");
-			new_fid = ERR_PTR(-ENOSPC);
-			goto Release_Fid;
-		}
-
-		err = v9fs_t_walk(v9ses, base_fid->fid, fid, NULL, &fcall);
-		if (err < 0) {
-			dprintk(DEBUG_ERROR, "clone walk didn't work\n");
-			v9fs_put_idpool(fid, &v9ses->fidpool);
-			new_fid = ERR_PTR(err);
-			goto Free_Fcall;
-		}
-		new_fid = v9fs_fid_create(v9ses, fid);
-		if (new_fid == NULL) {
-			dprintk(DEBUG_ERROR, "out of memory\n");
-			new_fid = ERR_PTR(-ENOMEM);
-		}
-Free_Fcall:
-		kfree(fcall);
-	}
+	struct p9_fid *ofid, *fid;
 
-Release_Fid:
-	up(&base_fid->lock);
-	return new_fid;
-}
+	P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+	ofid = v9fs_fid_lookup(dentry);
+	if (IS_ERR(ofid))
+		return ofid;
 
-void v9fs_fid_clunk(struct v9fs_session_info *v9ses, struct v9fs_fid *fid)
-{
-	v9fs_t_clunk(v9ses, fid->fid);
-	v9fs_fid_destroy(fid);
+	fid = p9_client_walk(ofid, 0, NULL, 1);
+	return fid;
 }

fs/9p/fid.h

@@ -22,41 +22,12 @@
 
 #include <linux/list.h>
 
-#define FID_OP   0
-#define FID_WALK 1
-#define FID_CREATE 2
-
-struct v9fs_fid {
-	struct list_head list;	 /* list of fids associated with a dentry */
-	struct list_head active; /* XXX - debug */
-
-	struct semaphore lock;
-
-	u32 fid;
-	unsigned char fidopen;	  /* set when fid is opened */
-	unsigned char fidclunked; /* set when fid has already been clunked */
-
-	struct v9fs_qid qid;
-	u32 iounit;
-
-	/* readdir stuff */
-	int rdir_fpos;
-	loff_t rdir_pos;
-	struct v9fs_fcall *rdir_fcall;
-
-	/* management stuff */
-	uid_t uid;		/* user associated with this fid */
-
-	/* private data */
-	struct file *filp;	/* backpointer to File struct for open files */
-	struct v9fs_session_info *v9ses;	/* session info for this FID */
+struct v9fs_dentry {
+	spinlock_t lock; /* protect fidlist */
+	struct list_head fidlist;
 };
 
-struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry);
-struct v9fs_fid *v9fs_fid_get_created(struct dentry *);
-void v9fs_fid_destroy(struct v9fs_fid *fid);
-struct v9fs_fid *v9fs_fid_create(struct v9fs_session_info *, int fid);
-int v9fs_fid_insert(struct v9fs_fid *fid, struct dentry *dentry);
-struct v9fs_fid *v9fs_fid_clone(struct dentry *dentry);
-void v9fs_fid_clunk(struct v9fs_session_info *v9ses, struct v9fs_fid *fid);
-
+struct p9_fid *v9fs_fid_lookup(struct dentry *dentry);
+struct p9_fid *v9fs_fid_lookup_remove(struct dentry *dentry);
+struct p9_fid *v9fs_fid_clone(struct dentry *dentry);
+int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid);

fs/9p/trans_fd.c

@@ -1,308 +0,0 @@
-/*
- * linux/fs/9p/trans_fd.c
- *
- * Fd transport layer.  Includes deprecated socket layer.
- *
- *  Copyright (C) 2006 by Russ Cox <rsc@swtch.com>
- *  Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
- *  Copyright (C) 2004-2005 by Eric Van Hensbergen <ericvh@gmail.com>
- *  Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
- *
- *  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/in.h>
-#include <linux/module.h>
-#include <linux/net.h>
-#include <linux/ipv6.h>
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/un.h>
-#include <asm/uaccess.h>
-#include <linux/inet.h>
-#include <linux/idr.h>
-#include <linux/file.h>
-
-#include "debug.h"
-#include "v9fs.h"
-#include "transport.h"
-
-#define V9FS_PORT 564
-
-struct v9fs_trans_fd {
-	struct file *rd;
-	struct file *wr;
-};
-
-/**
- * v9fs_fd_read- read from a fd
- * @v9ses: session information
- * @v: buffer to receive data into
- * @len: size of receive buffer
- *
- */
-static int v9fs_fd_read(struct v9fs_transport *trans, void *v, int len)
-{
-	int ret;
-	struct v9fs_trans_fd *ts;
-
-	if (!trans || trans->status == Disconnected || !(ts = trans->priv))
-		return -EREMOTEIO;
-
-	if (!(ts->rd->f_flags & O_NONBLOCK))
-		dprintk(DEBUG_ERROR, "blocking read ...\n");
-
-	ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
-	if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
-		trans->status = Disconnected;
-	return ret;
-}
-
-/**
- * v9fs_fd_write - write to a socket
- * @v9ses: session information
- * @v: buffer to send data from
- * @len: size of send buffer
- *
- */
-static int v9fs_fd_write(struct v9fs_transport *trans, void *v, int len)
-{
-	int ret;
-	mm_segment_t oldfs;
-	struct v9fs_trans_fd *ts;
-
-	if (!trans || trans->status == Disconnected || !(ts = trans->priv))
-		return -EREMOTEIO;
-
-	if (!(ts->wr->f_flags & O_NONBLOCK))
-		dprintk(DEBUG_ERROR, "blocking write ...\n");
-
-	oldfs = get_fs();
-	set_fs(get_ds());
-	/* The cast to a user pointer is valid due to the set_fs() */
-	ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
-	set_fs(oldfs);
-
-	if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
-		trans->status = Disconnected;
-	return ret;
-}
-
-static unsigned int
-v9fs_fd_poll(struct v9fs_transport *trans, struct poll_table_struct *pt)
-{
-	int ret, n;
-	struct v9fs_trans_fd *ts;
-	mm_segment_t oldfs;
-
-	if (!trans || trans->status != Connected || !(ts = trans->priv))
-		return -EREMOTEIO;
-
-	if (!ts->rd->f_op || !ts->rd->f_op->poll)
-		return -EIO;
-
-	if (!ts->wr->f_op || !ts->wr->f_op->poll)
-		return -EIO;
-
-	oldfs = get_fs();
-	set_fs(get_ds());
-
-	ret = ts->rd->f_op->poll(ts->rd, pt);
-	if (ret < 0)
-		goto end;
-
-	if (ts->rd != ts->wr) {
-		n = ts->wr->f_op->poll(ts->wr, pt);
-		if (n < 0) {
-			ret = n;
-			goto end;
-		}
-		ret = (ret & ~POLLOUT) | (n & ~POLLIN);
-	}
-
-      end:
-	set_fs(oldfs);
-	return ret;
-}
-
-static int v9fs_fd_open(struct v9fs_session_info *v9ses, int rfd, int wfd)
-{
-	struct v9fs_transport *trans = v9ses->transport;
-	struct v9fs_trans_fd *ts = kmalloc(sizeof(struct v9fs_trans_fd),
-					   GFP_KERNEL);
-	if (!ts)
-		return -ENOMEM;
-
-	ts->rd = fget(rfd);
-	ts->wr = fget(wfd);
-	if (!ts->rd || !ts->wr) {
-		if (ts->rd)
-			fput(ts->rd);
-		if (ts->wr)
-			fput(ts->wr);
-		kfree(ts);
-		return -EIO;
-	}
-
-	trans->priv = ts;
-	trans->status = Connected;
-
-	return 0;
-}
-
-static int v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr,
-			char *data)
-{
-	if (v9ses->rfdno == ~0 || v9ses->wfdno == ~0) {
-		printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
-		return -ENOPROTOOPT;
-	}
-
-	return v9fs_fd_open(v9ses, v9ses->rfdno, v9ses->wfdno);
-}
-
-static int v9fs_socket_open(struct v9fs_session_info *v9ses,
-			    struct socket *csocket)
-{
-	int fd, ret;
-
-	csocket->sk->sk_allocation = GFP_NOIO;
-	if ((fd = sock_map_fd(csocket)) < 0) {
-		eprintk(KERN_ERR, "v9fs_socket_open: failed to map fd\n");
-		ret = fd;
-	      release_csocket:
-		sock_release(csocket);
-		return ret;
-	}
-
-	if ((ret = v9fs_fd_open(v9ses, fd, fd)) < 0) {
-		sockfd_put(csocket);
-		eprintk(KERN_ERR, "v9fs_socket_open: failed to open fd\n");
-		goto release_csocket;
-	}
-
-	((struct v9fs_trans_fd *)v9ses->transport->priv)->rd->f_flags |=
-	    O_NONBLOCK;
-	return 0;
-}
-
-static int v9fs_tcp_init(struct v9fs_session_info *v9ses, const char *addr,
-			 char *data)
-{
-	int ret;
-	struct socket *csocket = NULL;
-	struct sockaddr_in sin_server;
-
-	sin_server.sin_family = AF_INET;
-	sin_server.sin_addr.s_addr = in_aton(addr);
-	sin_server.sin_port = htons(v9ses->port);
-	sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
-
-	if (!csocket) {
-		eprintk(KERN_ERR, "v9fs_trans_tcp: problem creating socket\n");
-		return -1;
-	}
-
-	ret = csocket->ops->connect(csocket,
-				    (struct sockaddr *)&sin_server,
-				    sizeof(struct sockaddr_in), 0);
-	if (ret < 0) {
-		eprintk(KERN_ERR,
-			"v9fs_trans_tcp: problem connecting socket to %s\n",
-			addr);
-		return ret;
-	}
-
-	return v9fs_socket_open(v9ses, csocket);
-}
-
-static int
-v9fs_unix_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
-{
-	int ret;
-	struct socket *csocket;
-	struct sockaddr_un sun_server;
-
-	if (strlen(addr) > UNIX_PATH_MAX) {
-		eprintk(KERN_ERR, "v9fs_trans_unix: address too long: %s\n",
-			addr);
-		return -ENAMETOOLONG;
-	}
-
-	sun_server.sun_family = PF_UNIX;
-	strcpy(sun_server.sun_path, addr);
-	sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
-	ret = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
-			sizeof(struct sockaddr_un) - 1, 0);
-	if (ret < 0) {
-		eprintk(KERN_ERR,
-			"v9fs_trans_unix: problem connecting socket: %s: %d\n",
-			addr, ret);
-		return ret;
-	}
-
-	return v9fs_socket_open(v9ses, csocket);
-}
-
-/**
- * v9fs_sock_close - shutdown socket
- * @trans: private socket structure
- *
- */
-static void v9fs_fd_close(struct v9fs_transport *trans)
-{
-	struct v9fs_trans_fd *ts;
-
-	if (!trans)
-		return;
-
-	ts = xchg(&trans->priv, NULL);
-
-	if (!ts)
-		return;
-
-	trans->status = Disconnected;
-	if (ts->rd)
-		fput(ts->rd);
-	if (ts->wr)
-		fput(ts->wr);
-	kfree(ts);
-}
-
-struct v9fs_transport v9fs_trans_fd = {
-	.init = v9fs_fd_init,
-	.write = v9fs_fd_write,
-	.read = v9fs_fd_read,
-	.close = v9fs_fd_close,
-	.poll = v9fs_fd_poll,
-};
-
-struct v9fs_transport v9fs_trans_tcp = {
-	.init = v9fs_tcp_init,
-	.write = v9fs_fd_write,
-	.read = v9fs_fd_read,
-	.close = v9fs_fd_close,
-	.poll = v9fs_fd_poll,
-};
-
-struct v9fs_transport v9fs_trans_unix = {
-	.init = v9fs_unix_init,
-	.write = v9fs_fd_write,
-	.read = v9fs_fd_read,
-	.close = v9fs_fd_close,
-	.poll = v9fs_fd_poll,
-};

fs/9p/v9fs.c

@@ -29,16 +29,12 @@
 #include <linux/sched.h>
 #include <linux/parser.h>
 #include <linux/idr.h>
-
-#include "debug.h"
+#include <net/9p/9p.h>
+#include <net/9p/transport.h>
+#include <net/9p/conn.h>
+#include <net/9p/client.h>
 #include "v9fs.h"
-#include "9p.h"
 #include "v9fs_vfs.h"
-#include "transport.h"
-#include "mux.h"
-
-/* TODO: sysfs or debugfs interface */
-int v9fs_debug_level = 0;	/* feature-rific global debug level  */
 
 /*
   * Option Parsing (code inspired by NFS code)
@@ -47,12 +43,12 @@ int v9fs_debug_level = 0;	/* feature-rific global debug level  */
 
 enum {
 	/* Options that take integer arguments */
-	Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid, Opt_debug,
+	Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid,
 	Opt_rfdno, Opt_wfdno,
 	/* String options */
 	Opt_uname, Opt_remotename,
 	/* Options that take no arguments */
-	Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd,
+	Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd, Opt_pci,
 	/* Cache options */
 	Opt_cache_loose,
 	/* Error token */
@@ -67,12 +63,14 @@ static match_table_t tokens = {
 	{Opt_afid, "afid=%u"},
 	{Opt_rfdno, "rfdno=%u"},
 	{Opt_wfdno, "wfdno=%u"},
-	{Opt_debug, "debug=%x"},
 	{Opt_uname, "uname=%s"},
 	{Opt_remotename, "aname=%s"},
 	{Opt_unix, "proto=unix"},
 	{Opt_tcp, "proto=tcp"},
 	{Opt_fd, "proto=fd"},
+#ifdef CONFIG_PCI_9P
+	{Opt_pci, "proto=pci"},
+#endif
 	{Opt_tcp, "tcp"},
 	{Opt_unix, "unix"},
 	{Opt_fd, "fd"},
@@ -83,6 +81,8 @@ static match_table_t tokens = {
 	{Opt_err, NULL}
 };
 
+extern struct p9_transport *p9pci_trans_create(void);
+
 /*
  *  Parse option string.
  */
@@ -122,7 +122,7 @@ static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses)
 		token = match_token(p, tokens, args);
 		if (token < Opt_uname) {
 			if ((ret = match_int(&args[0], &option)) < 0) {
-				dprintk(DEBUG_ERROR,
+				P9_DPRINTK(P9_DEBUG_ERROR,
 					"integer field, but no integer?\n");
 				continue;
 			}
@@ -149,15 +149,15 @@ static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses)
 		case Opt_wfdno:
 			v9ses->wfdno = option;
 			break;
-		case Opt_debug:
-			v9ses->debug = option;
-			break;
 		case Opt_tcp:
 			v9ses->proto = PROTO_TCP;
 			break;
 		case Opt_unix:
 			v9ses->proto = PROTO_UNIX;
 			break;
+		case Opt_pci:
+			v9ses->proto = PROTO_PCI;
+			break;
 		case Opt_fd:
 			v9ses->proto = PROTO_FD;
 			break;
@@ -182,82 +182,6 @@ static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses)
 	}
 }
 
-/**
- * v9fs_inode2v9ses - safely extract v9fs session info from super block
- * @inode: inode to extract information from
- *
- * Paranoid function to extract v9ses information from superblock,
- * if anything is missing it will report an error.
- *
- */
-
-struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode)
-{
-	return (inode->i_sb->s_fs_info);
-}
-
-/**
- * v9fs_get_idpool - allocate numeric id from pool
- * @p - pool to allocate from
- *
- * XXX - This seems to be an awful generic function, should it be in idr.c with
- *            the lock included in struct idr?
- */
-
-int v9fs_get_idpool(struct v9fs_idpool *p)
-{
-	int i = 0;
-	int error;
-
-retry:
-	if (idr_pre_get(&p->pool, GFP_KERNEL) == 0)
-		return 0;
-
-	if (down_interruptible(&p->lock) == -EINTR) {
-		eprintk(KERN_WARNING, "Interrupted while locking\n");
-		return -1;
-	}
-
-	/* no need to store exactly p, we just need something non-null */
-	error = idr_get_new(&p->pool, p, &i);
-	up(&p->lock);
-
-	if (error == -EAGAIN)
-		goto retry;
-	else if (error)
-		return -1;
-
-	return i;
-}
-
-/**
- * v9fs_put_idpool - release numeric id from pool
- * @p - pool to allocate from
- *
- * XXX - This seems to be an awful generic function, should it be in idr.c with
- *            the lock included in struct idr?
- */
-
-void v9fs_put_idpool(int id, struct v9fs_idpool *p)
-{
-	if (down_interruptible(&p->lock) == -EINTR) {
-		eprintk(KERN_WARNING, "Interrupted while locking\n");
-		return;
-	}
-	idr_remove(&p->pool, id);
-	up(&p->lock);
-}
-
-/**
- * v9fs_check_idpool - check if the specified id is available
- * @id - id to check
- * @p - pool
- */
-int v9fs_check_idpool(int id, struct v9fs_idpool *p)
-{
-	return idr_find(&p->pool, id) != NULL;
-}
-
 /**
  * v9fs_session_init - initialize session
  * @v9ses: session information structure
@@ -266,25 +190,21 @@ int v9fs_check_idpool(int id, struct v9fs_idpool *p)
  *
  */
 
-int
-v9fs_session_init(struct v9fs_session_info *v9ses,
+struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
 		  const char *dev_name, char *data)
 {
-	struct v9fs_fcall *fcall = NULL;
-	struct v9fs_transport *trans_proto;
-	int n = 0;
-	int newfid = -1;
 	int retval = -EINVAL;
-	struct v9fs_str *version;
+	struct p9_transport *trans;
+	struct p9_fid *fid;
 
 	v9ses->name = __getname();
 	if (!v9ses->name)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	v9ses->remotename = __getname();
 	if (!v9ses->remotename) {
 		__putname(v9ses->name);
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 	}
 
 	strcpy(v9ses->name, V9FS_DEFUSER);
@@ -292,130 +212,60 @@ v9fs_session_init(struct v9fs_session_info *v9ses,
 
 	v9fs_parse_options(data, v9ses);
 
-	/* set global debug level */
-	v9fs_debug_level = v9ses->debug;
-
-	/* id pools that are session-dependent: fids and tags */
-	idr_init(&v9ses->fidpool.pool);
-	init_MUTEX(&v9ses->fidpool.lock);
-
 	switch (v9ses->proto) {
 	case PROTO_TCP:
-		trans_proto = &v9fs_trans_tcp;
+		trans = p9_trans_create_tcp(dev_name, v9ses->port);
 		break;
 	case PROTO_UNIX:
-		trans_proto = &v9fs_trans_unix;
+		trans = p9_trans_create_unix(dev_name);
 		*v9ses->remotename = 0;
 		break;
 	case PROTO_FD:
-		trans_proto = &v9fs_trans_fd;
+		trans = p9_trans_create_fd(v9ses->rfdno, v9ses->wfdno);
+		*v9ses->remotename = 0;
+		break;
+#ifdef CONFIG_PCI_9P
+	case PROTO_PCI:
+		trans = p9pci_trans_create();
 		*v9ses->remotename = 0;
 		break;
+#endif
 	default:
 		printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
 		retval = -ENOPROTOOPT;
-		goto SessCleanUp;
+		goto error;
 	};
 
-	v9ses->transport = kmalloc(sizeof(*v9ses->transport), GFP_KERNEL);
-	if (!v9ses->transport) {
-		retval = -ENOMEM;
-		goto SessCleanUp;
+	if (IS_ERR(trans)) {
+		retval = PTR_ERR(trans);
+		trans = NULL;
+		goto error;
 	}
 
-	memmove(v9ses->transport, trans_proto, sizeof(*v9ses->transport));
+	v9ses->clnt = p9_client_create(trans, v9ses->maxdata + P9_IOHDRSZ,
+		v9ses->extended);
 
-	if ((retval = v9ses->transport->init(v9ses, dev_name, data)) < 0) {
-		eprintk(KERN_ERR, "problem initializing transport\n");
-		goto SessCleanUp;
+	if (IS_ERR(v9ses->clnt)) {
+		retval = PTR_ERR(v9ses->clnt);
+		v9ses->clnt = NULL;
+		P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
+		goto error;
 	}
 
-	v9ses->inprogress = 0;
-	v9ses->shutdown = 0;
-	v9ses->session_hung = 0;
-
-	v9ses->mux = v9fs_mux_init(v9ses->transport, v9ses->maxdata + V9FS_IOHDRSZ,
-		&v9ses->extended);
-
-	if (IS_ERR(v9ses->mux)) {
-		retval = PTR_ERR(v9ses->mux);
-		v9ses->mux = NULL;
-		dprintk(DEBUG_ERROR, "problem initializing mux\n");
-		goto SessCleanUp;
+	fid = p9_client_attach(v9ses->clnt, NULL, v9ses->name,
+							v9ses->remotename);
+	if (IS_ERR(fid)) {
+		retval = PTR_ERR(fid);
+		fid = NULL;
+		P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
+		goto error;
 	}
 
-	if (v9ses->afid == ~0) {
-		if (v9ses->extended)
-			retval =
-			    v9fs_t_version(v9ses, v9ses->maxdata, "9P2000.u",
-					   &fcall);
-		else
-			retval = v9fs_t_version(v9ses, v9ses->maxdata, "9P2000",
-						&fcall);
-
-		if (retval < 0) {
-			dprintk(DEBUG_ERROR, "v9fs_t_version failed\n");
-			goto FreeFcall;
-		}
-
-		version = &fcall->params.rversion.version;
-		if (version->len==8 && !memcmp(version->str, "9P2000.u", 8)) {
-			dprintk(DEBUG_9P, "9P2000 UNIX extensions enabled\n");
-			v9ses->extended = 1;
-		} else if (version->len==6 && !memcmp(version->str, "9P2000", 6)) {
-			dprintk(DEBUG_9P, "9P2000 legacy mode enabled\n");
-			v9ses->extended = 0;
-		} else {
-			retval = -EREMOTEIO;
-			goto FreeFcall;
-		}
+	return fid;
 
-		n = fcall->params.rversion.msize;
-		kfree(fcall);
-
-		if (n < v9ses->maxdata)
-			v9ses->maxdata = n;
-	}
-
-	newfid = v9fs_get_idpool(&v9ses->fidpool);
-	if (newfid < 0) {
-		eprintk(KERN_WARNING, "couldn't allocate FID\n");
-		retval = -ENOMEM;
-		goto SessCleanUp;
-	}
-	/* it is a little bit ugly, but we have to prevent newfid */
-	/* being the same as afid, so if it is, get a new fid     */
-	if (v9ses->afid != ~0 && newfid == v9ses->afid) {
-		newfid = v9fs_get_idpool(&v9ses->fidpool);
-		if (newfid < 0) {
-			eprintk(KERN_WARNING, "couldn't allocate FID\n");
-			retval = -ENOMEM;
-			goto SessCleanUp;
-		}
-	}
-
-	if ((retval =
-	     v9fs_t_attach(v9ses, v9ses->name, v9ses->remotename, newfid,
-			   v9ses->afid, NULL))
-	    < 0) {
-		dprintk(DEBUG_ERROR, "cannot attach\n");
-		goto SessCleanUp;
-	}
-
-	if (v9ses->afid != ~0) {
-		dprintk(DEBUG_ERROR, "afid not equal to ~0\n");
-		if (v9fs_t_clunk(v9ses, v9ses->afid))
-			dprintk(DEBUG_ERROR, "clunk failed\n");
-	}
-
-	return newfid;
-
-      FreeFcall:
-	kfree(fcall);
-
-      SessCleanUp:
+error:
 	v9fs_session_close(v9ses);
-	return retval;
+	return ERR_PTR(retval);
 }
 
 /**
@@ -426,15 +276,9 @@ v9fs_session_init(struct v9fs_session_info *v9ses,
 
 void v9fs_session_close(struct v9fs_session_info *v9ses)
 {
-	if (v9ses->mux) {
-		v9fs_mux_destroy(v9ses->mux);
-		v9ses->mux = NULL;
-	}
-
-	if (v9ses->transport) {
-		v9ses->transport->close(v9ses->transport);
-		kfree(v9ses->transport);
-		v9ses->transport = NULL;
+	if (v9ses->clnt) {
+		p9_client_destroy(v9ses->clnt);
+		v9ses->clnt = NULL;
 	}
 
 	__putname(v9ses->name);
@@ -446,9 +290,8 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
  * 	and cancel all pending requests.
  */
 void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
-	dprintk(DEBUG_ERROR, "cancel session %p\n", v9ses);
-	v9ses->transport->status = Disconnected;
-	v9fs_mux_cancel(v9ses->mux, -EIO);
+	P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
+	p9_client_disconnect(v9ses->clnt);
 }
 
 extern int v9fs_error_init(void);
@@ -460,24 +303,9 @@ extern int v9fs_error_init(void);
 
 static int __init init_v9fs(void)
 {
-	int ret;
-
-	v9fs_error_init();
-
 	printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
 
-	ret = v9fs_mux_global_init();
-	if (ret) {
-		printk(KERN_WARNING "v9fs: starting mux failed\n");
-		return ret;
-	}
-	ret = register_filesystem(&v9fs_fs_type);
-	if (ret) {
-		printk(KERN_WARNING "v9fs: registering file system failed\n");
-		v9fs_mux_global_exit();
-	}
-
-	return ret;
+	return register_filesystem(&v9fs_fs_type);
 }
 
 /**
@@ -487,13 +315,13 @@ static int __init init_v9fs(void)
 
 static void __exit exit_v9fs(void)
 {
-	v9fs_mux_global_exit();
 	unregister_filesystem(&v9fs_fs_type);
 }
 
 module_init(init_v9fs)
 module_exit(exit_v9fs)
 
+MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
 MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
 MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
 MODULE_LICENSE("GPL");

fs/9p/v9fs.h

@@ -21,16 +21,6 @@
  *
  */
 
-/*
-  * Idpool structure provides lock and id management
-  *
-  */
-
-struct v9fs_idpool {
-	struct semaphore lock;
-	struct idr pool;
-};
-
 /*
   * Session structure provides information for an opened session
   *
@@ -54,15 +44,7 @@ struct v9fs_session_info {
 	unsigned int uid;	/* default uid/muid for legacy support */
 	unsigned int gid;	/* default gid for legacy support */
 
-	/* book keeping */
-	struct v9fs_idpool fidpool;	/* The FID pool for file descriptors */
-
-	struct v9fs_transport *transport;
-	struct v9fs_mux_data *mux;
-
-	int inprogress;		/* session in progress => true */
-	int shutdown;		/* session shutting down. no more attaches. */
-	unsigned char session_hung;
+	struct p9_client *clnt;	/* 9p client */
 	struct dentry *debugfs_dir;
 };
 
@@ -71,6 +53,7 @@ enum {
 	PROTO_TCP,
 	PROTO_UNIX,
 	PROTO_FD,
+	PROTO_PCI,
 };
 
 /* possible values of ->cache */
@@ -82,12 +65,9 @@ enum {
 
 extern struct dentry *v9fs_debugfs_root;
 
-int v9fs_session_init(struct v9fs_session_info *, const char *, char *);
-struct v9fs_session_info *v9fs_inode2v9ses(struct inode *);
+struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
+									char *);
 void v9fs_session_close(struct v9fs_session_info *v9ses);
-int v9fs_get_idpool(struct v9fs_idpool *p);
-void v9fs_put_idpool(int id, struct v9fs_idpool *p);
-int v9fs_check_idpool(int id, struct v9fs_idpool *p);
 void v9fs_session_cancel(struct v9fs_session_info *v9ses);
 
 #define V9FS_MAGIC 0x01021997
@@ -97,3 +77,7 @@ void v9fs_session_cancel(struct v9fs_session_info *v9ses);
 #define V9FS_DEFUSER	"nobody"
 #define V9FS_DEFANAME	""
 
+static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode)
+{
+	return (inode->i_sb->s_fs_info);
+}

fs/9p/v9fs_vfs.h

@@ -45,10 +45,10 @@ extern struct dentry_operations v9fs_dentry_operations;
 extern struct dentry_operations v9fs_cached_dentry_operations;
 
 struct inode *v9fs_get_inode(struct super_block *sb, int mode);
-ino_t v9fs_qid2ino(struct v9fs_qid *qid);
-void v9fs_stat2inode(struct v9fs_stat *, struct inode *, struct super_block *);
+ino_t v9fs_qid2ino(struct p9_qid *qid);
+void v9fs_stat2inode(struct p9_stat *, struct inode *, struct super_block *);
 int v9fs_dir_release(struct inode *inode, struct file *filp);
 int v9fs_file_open(struct inode *inode, struct file *file);
-void v9fs_inode2stat(struct inode *inode, struct v9fs_stat *stat);
+void v9fs_inode2stat(struct inode *inode, struct p9_stat *stat);
 void v9fs_dentry_release(struct dentry *);
 int v9fs_uflags2omode(int uflags);

fs/9p/vfs_addr.c

@@ -33,10 +33,10 @@
 #include <linux/pagemap.h>
 #include <linux/idr.h>
 #include <linux/sched.h>
+#include <net/9p/9p.h>
+#include <net/9p/client.h>
 
-#include "debug.h"
 #include "v9fs.h"
-#include "9p.h"
 #include "v9fs_vfs.h"
 #include "fid.h"
 
@@ -50,55 +50,26 @@
 
 static int v9fs_vfs_readpage(struct file *filp, struct page *page)
 {
-	char *buffer = NULL;
-	int retval = -EIO;
-	loff_t offset = page_offset(page);
-	int count = PAGE_CACHE_SIZE;
-	struct inode *inode = filp->f_path.dentry->d_inode;
-	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
-	int rsize = v9ses->maxdata - V9FS_IOHDRSZ;
-	struct v9fs_fid *v9f = filp->private_data;
-	struct v9fs_fcall *fcall = NULL;
-	int fid = v9f->fid;
-	int total = 0;
-	int result = 0;
-
-	dprintk(DEBUG_VFS, "\n");
+	int retval;
+	loff_t offset;
+	char *buffer;
+	struct p9_fid *fid;
 
+	P9_DPRINTK(P9_DEBUG_VFS, "\n");
+	fid = filp->private_data;
 	buffer = kmap(page);
-	do {
-		if (count < rsize)
-			rsize = count;
-
-		result = v9fs_t_read(v9ses, fid, offset, rsize, &fcall);
-
-		if (result < 0) {
-			printk(KERN_ERR "v9fs_t_read returned %d\n",
-			       result);
-
-			kfree(fcall);
-			goto UnmapAndUnlock;
-		} else
-			offset += result;
-
-		memcpy(buffer, fcall->params.rread.data, result);
-
-		count -= result;
-		buffer += result;
-		total += result;
-
-		kfree(fcall);
+	offset = page_offset(page);
 
-		if (result < rsize)
-			break;
-	} while (count);
+	retval = p9_client_readn(fid, buffer, offset, PAGE_CACHE_SIZE);
+	if (retval < 0)
+		goto done;
 
-	memset(buffer, 0, count);
+	memset(buffer + retval, 0, PAGE_CACHE_SIZE - retval);
 	flush_dcache_page(page);
 	SetPageUptodate(page);
 	retval = 0;
 
-UnmapAndUnlock:
+done:
 	kunmap(page);
 	unlock_page(page);
 	return retval;

fs/9p/vfs_dentry.c

@@ -34,10 +34,10 @@
 #include <linux/namei.h>
 #include <linux/idr.h>
 #include <linux/sched.h>
+#include <net/9p/9p.h>
+#include <net/9p/client.h>
 
-#include "debug.h"
 #include "v9fs.h"
-#include "9p.h"
 #include "v9fs_vfs.h"
 #include "fid.h"
 
@@ -52,7 +52,7 @@
 
 static int v9fs_dentry_delete(struct dentry *dentry)
 {
-	dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+	P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
 
 	return 1;
 }
@@ -69,7 +69,7 @@ static int v9fs_dentry_delete(struct dentry *dentry)
 static int v9fs_cached_dentry_delete(struct dentry *dentry)
 {
 	struct inode *inode = dentry->d_inode;
-	dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+	P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
 
 	if(!inode)
 		return 1;
@@ -85,26 +85,19 @@ static int v9fs_cached_dentry_delete(struct dentry *dentry)
 
 void v9fs_dentry_release(struct dentry *dentry)
 {
-	int err;
-
-	dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
-
-	if (dentry->d_fsdata != NULL) {
-		struct list_head *fid_list = dentry->d_fsdata;
-		struct v9fs_fid *temp = NULL;
-		struct v9fs_fid *current_fid = NULL;
-
-		list_for_each_entry_safe(current_fid, temp, fid_list, list) {
-			err = v9fs_t_clunk(current_fid->v9ses, current_fid->fid);
-
-			if (err < 0)
-				dprintk(DEBUG_ERROR, "clunk failed: %d name %s\n",
-					err, dentry->d_iname);
-
-			v9fs_fid_destroy(current_fid);
+	struct v9fs_dentry *dent;
+	struct p9_fid *temp, *current_fid;
+
+	P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+	dent = dentry->d_fsdata;
+	if (dent) {
+		list_for_each_entry_safe(current_fid, temp, &dent->fidlist,
+									dlist) {
+			p9_client_clunk(current_fid);
 		}
 
-		kfree(dentry->d_fsdata);	/* free the list_head */
+		kfree(dent);
+		dentry->d_fsdata = NULL;
 	}
 }
 

fs/9p/vfs_dir.c

@@ -32,11 +32,10 @@
 #include <linux/sched.h>
 #include <linux/inet.h>
 #include <linux/idr.h>
+#include <net/9p/9p.h>
+#include <net/9p/client.h>
 
-#include "debug.h"
 #include "v9fs.h"
-#include "9p.h"
-#include "conv.h"
 #include "v9fs_vfs.h"
 #include "fid.h"
 
@@ -46,14 +45,14 @@
  *
  */
 
-static inline int dt_type(struct v9fs_stat *mistat)
+static inline int dt_type(struct p9_stat *mistat)
 {
 	unsigned long perm = mistat->mode;
 	int rettype = DT_REG;
 
-	if (perm & V9FS_DMDIR)
+	if (perm & P9_DMDIR)
 		rettype = DT_DIR;
-	if (perm & V9FS_DMSYMLINK)
+	if (perm & P9_DMSYMLINK)
 		rettype = DT_LNK;
 
 	return rettype;
@@ -69,106 +68,36 @@ static inline int dt_type(struct v9fs_stat *mistat)
 
 static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
 {
-	struct v9fs_fcall *fcall = NULL;
-	struct inode *inode = filp->f_path.dentry->d_inode;
-	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
-	struct v9fs_fid *file = filp->private_data;
-	unsigned int i, n, s;
-	int fid = -1;
-	int ret = 0;
-	struct v9fs_stat stat;
-	int over = 0;
-
-	dprintk(DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
-
-	fid = file->fid;
-
-	if (file->rdir_fcall && (filp->f_pos != file->rdir_pos)) {
-		kfree(file->rdir_fcall);
-		file->rdir_fcall = NULL;
-	}
-
-	if (file->rdir_fcall) {
-		n = file->rdir_fcall->params.rread.count;
-		i = file->rdir_fpos;
-		while (i < n) {
-			s = v9fs_deserialize_stat(
-				file->rdir_fcall->params.rread.data + i,
-				n - i, &stat, v9ses->extended);
-
-			if (s == 0) {
-				dprintk(DEBUG_ERROR,
-					"error while deserializing stat\n");
-				ret = -EIO;
-				goto FreeStructs;
-			}
-
-			over = filldir(dirent, stat.name.str, stat.name.len,
-				    filp->f_pos, v9fs_qid2ino(&stat.qid),
-				    dt_type(&stat));
-
-			if (over) {
-				file->rdir_fpos = i;
-				file->rdir_pos = filp->f_pos;
-				break;
-			}
-
-			i += s;
-			filp->f_pos += s;
-		}
-
-		if (!over) {
-			kfree(file->rdir_fcall);
-			file->rdir_fcall = NULL;
-		}
-	}
-
-	while (!over) {
-		ret = v9fs_t_read(v9ses, fid, filp->f_pos,
-			v9ses->maxdata-V9FS_IOHDRSZ, &fcall);
-		if (ret < 0) {
-			dprintk(DEBUG_ERROR, "error while reading: %d: %p\n",
-				ret, fcall);
-			goto FreeStructs;
-		} else if (ret == 0)
+	int over;
+	struct p9_fid *fid;
+	struct v9fs_session_info *v9ses;
+	struct inode *inode;
+	struct p9_stat *st;
+
+	P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
+	inode = filp->f_path.dentry->d_inode;
+	v9ses = v9fs_inode2v9ses(inode);
+	fid = filp->private_data;
+	while ((st = p9_client_dirread(fid, filp->f_pos)) != NULL) {
+		if (IS_ERR(st))
+			return PTR_ERR(st);
+
+		over = filldir(dirent, st->name.str, st->name.len, filp->f_pos,
+			v9fs_qid2ino(&st->qid), dt_type(st));
+
+		if (over)
 			break;
 
-		n = ret;
-		i = 0;
-		while (i < n) {
-			s = v9fs_deserialize_stat(fcall->params.rread.data + i,
-				n - i, &stat, v9ses->extended);
-
-			if (s == 0) {
-				dprintk(DEBUG_ERROR,
-					"error while deserializing stat\n");
-				return -EIO;
-			}
-
-			over = filldir(dirent, stat.name.str, stat.name.len,
-				    filp->f_pos, v9fs_qid2ino(&stat.qid),
-				    dt_type(&stat));
-
-			if (over) {
-				file->rdir_fcall = fcall;
-				file->rdir_fpos = i;
-				file->rdir_pos = filp->f_pos;
-				fcall = NULL;
-				break;
-			}
-
-			i += s;
-			filp->f_pos += s;
-		}
-
-		kfree(fcall);
+		filp->f_pos += st->size;
+		kfree(st);
+		st = NULL;
 	}
 
-      FreeStructs:
-	kfree(fcall);
-	return ret;
+	kfree(st);
+	return 0;
 }
 
+
 /**
  * v9fs_dir_release - close a directory
  * @inode: inode of the directory
@@ -178,29 +107,13 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
 
 int v9fs_dir_release(struct inode *inode, struct file *filp)
 {
-	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
-	struct v9fs_fid *fid = filp->private_data;
-	int fidnum = -1;
-
-	dprintk(DEBUG_VFS, "inode: %p filp: %p fid: %d\n", inode, filp,
-		fid->fid);
-	fidnum = fid->fid;
+	struct p9_fid *fid;
 
+	fid = filp->private_data;
+	P9_DPRINTK(P9_DEBUG_VFS,
+			"inode: %p filp: %p fid: %d\n", inode, filp, fid->fid);
 	filemap_write_and_wait(inode->i_mapping);
-
-	if (fidnum >= 0) {
-		dprintk(DEBUG_VFS, "fidopen: %d v9f->fid: %d\n", fid->fidopen,
-			fid->fid);
-
-		if (v9fs_t_clunk(v9ses, fidnum))
-			dprintk(DEBUG_ERROR, "clunk failed\n");
-
-		kfree(fid->rdir_fcall);
-		kfree(fid);
-
-		filp->private_data = NULL;
-	}
-
+	p9_client_clunk(fid);
 	return 0;
 }
 

fs/9p/vfs_file.c

@@ -34,10 +34,10 @@
 #include <linux/list.h>
 #include <asm/uaccess.h>
 #include <linux/idr.h>
+#include <net/9p/9p.h>
+#include <net/9p/client.h>
 
-#include "debug.h"
 #include "v9fs.h"
-#include "9p.h"
 #include "v9fs_vfs.h"
 #include "fid.h"
 
@@ -52,48 +52,36 @@ static const struct file_operations v9fs_cached_file_operations;
 
 int v9fs_file_open(struct inode *inode, struct file *file)
 {
-	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
-	struct v9fs_fid *vfid;
-	struct v9fs_fcall *fcall = NULL;
-	int omode;
 	int err;
+	struct v9fs_session_info *v9ses;
+	struct p9_fid *fid;
+	int omode;
 
-	dprintk(DEBUG_VFS, "inode: %p file: %p \n", inode, file);
-
-	vfid = v9fs_fid_clone(file->f_path.dentry);
-	if (IS_ERR(vfid))
-		return PTR_ERR(vfid);
-
+	P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p \n", inode, file);
+	v9ses = v9fs_inode2v9ses(inode);
 	omode = v9fs_uflags2omode(file->f_flags);
-	err = v9fs_t_open(v9ses, vfid->fid, omode, &fcall);
+	fid = file->private_data;
+	if (!fid) {
+		fid = v9fs_fid_clone(file->f_path.dentry);
+		if (IS_ERR(fid))
+			return PTR_ERR(fid);
+
+		err = p9_client_open(fid, omode);
 	if (err < 0) {
-		PRINT_FCALL_ERROR("open failed", fcall);
-		goto Clunk_Fid;
+			p9_client_clunk(fid);
+			return err;
+		}
 	}
 
-	file->private_data = vfid;
-	vfid->fidopen = 1;
-	vfid->fidclunked = 0;
-	vfid->iounit = fcall->params.ropen.iounit;
-	vfid->rdir_pos = 0;
-	vfid->rdir_fcall = NULL;
-	vfid->filp = file;
-	kfree(fcall);
-
-	if((vfid->qid.version) && (v9ses->cache)) {
-		dprintk(DEBUG_VFS, "cached");
+	file->private_data = fid;
+	if ((fid->qid.version) && (v9ses->cache)) {
+		P9_DPRINTK(P9_DEBUG_VFS, "cached");
 		/* enable cached file options */
 		if(file->f_op == &v9fs_file_operations)
 			file->f_op = &v9fs_cached_file_operations;
 	}
 
 	return 0;
-
-Clunk_Fid:
-	v9fs_fid_clunk(v9ses, vfid);
-	kfree(fcall);
-
-	return err;
 }
 
 /**
@@ -110,7 +98,7 @@ static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
 	int res = 0;
 	struct inode *inode = filp->f_path.dentry->d_inode;
 
-	dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
+	P9_DPRINTK(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
 
 	/* No mandatory locks */
 	if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
@@ -136,55 +124,16 @@ static ssize_t
 v9fs_file_read(struct file *filp, char __user * data, size_t count,
 	       loff_t * offset)
 {
-	struct inode *inode = filp->f_path.dentry->d_inode;
-	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
-	struct v9fs_fid *v9f = filp->private_data;
-	struct v9fs_fcall *fcall = NULL;
-	int fid = v9f->fid;
-	int rsize = 0;
-	int result = 0;
-	int total = 0;
-	int n;
-
-	dprintk(DEBUG_VFS, "\n");
-
-	rsize = v9ses->maxdata - V9FS_IOHDRSZ;
-	if (v9f->iounit != 0 && rsize > v9f->iounit)
-		rsize = v9f->iounit;
-
-	do {
-		if (count < rsize)
-			rsize = count;
+	int ret;
+	struct p9_fid *fid;
 
-		result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall);
+	P9_DPRINTK(P9_DEBUG_VFS, "\n");
+	fid = filp->private_data;
+	ret = p9_client_uread(fid, data, *offset, count);
+	if (ret > 0)
+		*offset += ret;
 
-		if (result < 0) {
-			printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n",
-			       result);
-
-			kfree(fcall);
-			return total;
-		} else
-			*offset += result;
-
-		n = copy_to_user(data, fcall->params.rread.data, result);
-		if (n) {
-			dprintk(DEBUG_ERROR, "Problem copying to user %d\n", n);
-			kfree(fcall);
-			return -EFAULT;
-		}
-
-		count -= result;
-		data += result;
-		total += result;
-
-		kfree(fcall);
-
-		if (result < rsize)
-			break;
-	} while (count);
-
-	return total;
+	return ret;
 }
 
 /**
@@ -200,50 +149,19 @@ static ssize_t
 v9fs_file_write(struct file *filp, const char __user * data,
 		size_t count, loff_t * offset)
 {
-	struct inode *inode = filp->f_path.dentry->d_inode;
-	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
-	struct v9fs_fid *v9fid = filp->private_data;
-	struct v9fs_fcall *fcall;
-	int fid = v9fid->fid;
-	int result = -EIO;
-	int rsize = 0;
-	int total = 0;
-
-	dprintk(DEBUG_VFS, "data %p count %d offset %x\n", data, (int)count,
-		(int)*offset);
-	rsize = v9ses->maxdata - V9FS_IOHDRSZ;
-	if (v9fid->iounit != 0 && rsize > v9fid->iounit)
-		rsize = v9fid->iounit;
-
-	do {
-		if (count < rsize)
-			rsize = count;
+	int ret;
+	struct p9_fid *fid;
 
-		result = v9fs_t_write(v9ses, fid, *offset, rsize, data, &fcall);
-		if (result < 0) {
-			PRINT_FCALL_ERROR("error while writing", fcall);
-			kfree(fcall);
-			return result;
-		} else
-			*offset += result;
-
-		kfree(fcall);
-		fcall = NULL;
-
-		if (result != rsize) {
-			eprintk(KERN_ERR,
-				"short write: v9fs_t_write returned %d\n",
-				result);
-			break;
-		}
+	P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data,
+		(int)count, (int)*offset);
 
-		count -= result;
-		data += result;
-		total += result;
-	} while (count);
+	fid = filp->private_data;
+	ret = p9_client_uwrite(fid, data, *offset, count);
+	if (ret > 0)
+		*offset += ret;
 
-	invalidate_inode_pages2(inode->i_mapping);
-	return total;
+	invalidate_inode_pages2(filp->f_path.dentry->d_inode->i_mapping);
+	return ret;
 }
 
 static const struct file_operations v9fs_cached_file_operations = {

fs/9p/vfs_super.c

@@ -37,10 +37,10 @@
 #include <linux/mount.h>
 #include <linux/idr.h>
 #include <linux/sched.h>
+#include <net/9p/9p.h>
+#include <net/9p/client.h>
 
-#include "debug.h"
 #include "v9fs.h"
-#include "9p.h"
 #include "v9fs_vfs.h"
 #include "fid.h"
 
@@ -107,41 +107,48 @@ static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
 		       struct vfsmount *mnt)
 {
 	struct super_block *sb = NULL;
-	struct v9fs_fcall *fcall = NULL;
 	struct inode *inode = NULL;
 	struct dentry *root = NULL;
 	struct v9fs_session_info *v9ses = NULL;
-	struct v9fs_fid *root_fid = NULL;
+	struct p9_stat *st = NULL;
 	int mode = S_IRWXUGO | S_ISVTX;
 	uid_t uid = current->fsuid;
 	gid_t gid = current->fsgid;
-	int stat_result = 0;
-	int newfid = 0;
+	struct p9_fid *fid;
 	int retval = 0;
 
-	dprintk(DEBUG_VFS, " \n");
+	P9_DPRINTK(P9_DEBUG_VFS, " \n");
 
 	v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
 	if (!v9ses)
 		return -ENOMEM;
 
-	if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) {
-		dprintk(DEBUG_ERROR, "problem initiating session\n");
-		retval = newfid;
-		goto out_free_session;
+	fid = v9fs_session_init(v9ses, dev_name, data);
+	if (IS_ERR(fid)) {
+		retval = PTR_ERR(fid);
+		fid = NULL;
+		kfree(v9ses);
+		v9ses = NULL;
+		goto error;
+	}
+
+	st = p9_client_stat(fid);
+	if (IS_ERR(st)) {
+		retval = PTR_ERR(st);
+		goto error;
 	}
 
 	sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
 	if (IS_ERR(sb)) {
 		retval = PTR_ERR(sb);
-		goto out_close_session;
+		goto error;
 	}
 	v9fs_fill_super(sb, v9ses, flags);
 
 	inode = v9fs_get_inode(sb, S_IFDIR | mode);
 	if (IS_ERR(inode)) {
 		retval = PTR_ERR(inode);
-		goto put_back_sb;
+		goto error;
 	}
 
 	inode->i_uid = uid;
@@ -150,54 +157,30 @@ static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
 	root = d_alloc_root(inode);
 	if (!root) {
 		retval = -ENOMEM;
-		goto put_back_sb;
+		goto error;
 	}
 
 	sb->s_root = root;
+	root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
+	v9fs_stat2inode(st, root->d_inode, sb);
+	v9fs_fid_add(root, fid);
 
-	stat_result = v9fs_t_stat(v9ses, newfid, &fcall);
-	if (stat_result < 0) {
-		dprintk(DEBUG_ERROR, "stat error\n");
-		v9fs_t_clunk(v9ses, newfid);
-	} else {
-		/* Setup the Root Inode */
-		root_fid = v9fs_fid_create(v9ses, newfid);
-		if (root_fid == NULL) {
-			retval = -ENOMEM;
-			goto put_back_sb;
-		}
-
-		retval = v9fs_fid_insert(root_fid, root);
-		if (retval < 0) {
-			kfree(fcall);
-			goto put_back_sb;
-		}
-
-		root_fid->qid = fcall->params.rstat.stat.qid;
-		root->d_inode->i_ino =
-		    v9fs_qid2ino(&fcall->params.rstat.stat.qid);
-		v9fs_stat2inode(&fcall->params.rstat.stat, root->d_inode, sb);
-	}
+	return simple_set_mnt(mnt, sb);
 
-	kfree(fcall);
+error:
+	if (fid)
+		p9_client_clunk(fid);
 
-	if (stat_result < 0) {
-		retval = stat_result;
-		goto put_back_sb;
+	if (v9ses) {
+		v9fs_session_close(v9ses);
+		kfree(v9ses);
 	}
 
-	return simple_set_mnt(mnt, sb);
-
-out_close_session:
-	v9fs_session_close(v9ses);
-out_free_session:
-	kfree(v9ses);
-	return retval;
+	if (sb) {
+		up_write(&sb->s_umount);
+		deactivate_super(sb);
+	}
 
-put_back_sb:
-	/* deactivate_super calls v9fs_kill_super which will frees the rest */
-	up_write(&sb->s_umount);
-	deactivate_super(sb);
 	return retval;
 }
 
@@ -211,7 +194,7 @@ static void v9fs_kill_super(struct super_block *s)
 {
 	struct v9fs_session_info *v9ses = s->s_fs_info;
 
-	dprintk(DEBUG_VFS, " %p\n", s);
+	P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s);
 
 	v9fs_dentry_release(s->s_root);	/* clunk root */
 
@@ -219,7 +202,7 @@ static void v9fs_kill_super(struct super_block *s)
 
 	v9fs_session_close(v9ses);
 	kfree(v9ses);
-	dprintk(DEBUG_VFS, "exiting kill_super\n");
+	P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n");
 }
 
 /**

fs/Kconfig

@@ -2048,7 +2048,7 @@ config AFS_DEBUG
 
 config 9P_FS
 	tristate "Plan 9 Resource Sharing Support (9P2000) (Experimental)"
-	depends on INET && EXPERIMENTAL
+	depends on INET && NET_9P && EXPERIMENTAL
 	help
 	  If you say Y here, you will get experimental support for
 	  Plan 9 resource sharing via the 9P2000 protocol.

include/net/9p/9p.h

@@ -0,0 +1,417 @@
+/*
+ * include/net/9p/9p.h
+ *
+ * 9P protocol definitions.
+ *
+ *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
+ *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
+ *
+ *  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
+ *
+ */
+
+#ifndef NET_9P_H
+#define NET_9P_H
+
+#ifdef CONFIG_NET_9P_DEBUG
+
+#define P9_DEBUG_ERROR		(1<<0)
+#define P9_DEBUG_9P	        (1<<2)
+#define P9_DEBUG_VFS	        (1<<3)
+#define P9_DEBUG_CONV		(1<<4)
+#define P9_DEBUG_MUX		(1<<5)
+#define P9_DEBUG_TRANS		(1<<6)
+#define P9_DEBUG_SLABS	      	(1<<7)
+#define P9_DEBUG_FCALL		(1<<8)
+
+extern unsigned int p9_debug_level;
+
+#define P9_DPRINTK(level, format, arg...) \
+do {  \
+	if ((p9_debug_level & level) == level) \
+		printk(KERN_NOTICE "-- %s (%d): " \
+		format , __FUNCTION__, current->pid , ## arg); \
+} while (0)
+
+#define PRINT_FCALL_ERROR(s, fcall) P9_DPRINTK(P9_DEBUG_ERROR,   \
+	"%s: %.*s\n", s, fcall?fcall->params.rerror.error.len:0, \
+	fcall?fcall->params.rerror.error.str:"");
+
+#else
+#define P9_DPRINTK(level, format, arg...)  do { } while (0)
+#define PRINT_FCALL_ERROR(s, fcall) do { } while (0)
+#endif
+
+#define P9_EPRINTK(level, format, arg...) \
+do { \
+	printk(level "9p: %s (%d): " \
+		format , __FUNCTION__, current->pid , ## arg); \
+} while (0)
+
+
+/* Message Types */
+enum {
+	P9_TVERSION = 100,
+	P9_RVERSION,
+	P9_TAUTH = 102,
+	P9_RAUTH,
+	P9_TATTACH = 104,
+	P9_RATTACH,
+	P9_TERROR = 106,
+	P9_RERROR,
+	P9_TFLUSH = 108,
+	P9_RFLUSH,
+	P9_TWALK = 110,
+	P9_RWALK,
+	P9_TOPEN = 112,
+	P9_ROPEN,
+	P9_TCREATE = 114,
+	P9_RCREATE,
+	P9_TREAD = 116,
+	P9_RREAD,
+	P9_TWRITE = 118,
+	P9_RWRITE,
+	P9_TCLUNK = 120,
+	P9_RCLUNK,
+	P9_TREMOVE = 122,
+	P9_RREMOVE,
+	P9_TSTAT = 124,
+	P9_RSTAT,
+	P9_TWSTAT = 126,
+	P9_RWSTAT,
+};
+
+/* open modes */
+enum {
+	P9_OREAD = 0x00,
+	P9_OWRITE = 0x01,
+	P9_ORDWR = 0x02,
+	P9_OEXEC = 0x03,
+	P9_OEXCL = 0x04,
+	P9_OTRUNC = 0x10,
+	P9_OREXEC = 0x20,
+	P9_ORCLOSE = 0x40,
+	P9_OAPPEND = 0x80,
+};
+
+/* permissions */
+enum {
+	P9_DMDIR = 0x80000000,
+	P9_DMAPPEND = 0x40000000,
+	P9_DMEXCL = 0x20000000,
+	P9_DMMOUNT = 0x10000000,
+	P9_DMAUTH = 0x08000000,
+	P9_DMTMP = 0x04000000,
+	P9_DMSYMLINK = 0x02000000,
+	P9_DMLINK = 0x01000000,
+	/* 9P2000.u extensions */
+	P9_DMDEVICE = 0x00800000,
+	P9_DMNAMEDPIPE = 0x00200000,
+	P9_DMSOCKET = 0x00100000,
+	P9_DMSETUID = 0x00080000,
+	P9_DMSETGID = 0x00040000,
+};
+
+/* qid.types */
+enum {
+	P9_QTDIR = 0x80,
+	P9_QTAPPEND = 0x40,
+	P9_QTEXCL = 0x20,
+	P9_QTMOUNT = 0x10,
+	P9_QTAUTH = 0x08,
+	P9_QTTMP = 0x04,
+	P9_QTSYMLINK = 0x02,
+	P9_QTLINK = 0x01,
+	P9_QTFILE = 0x00,
+};
+
+#define P9_NOTAG	(u16)(~0)
+#define P9_NOFID	(u32)(~0)
+#define P9_MAXWELEM	16
+
+/* ample room for Twrite/Rread header */
+#define P9_IOHDRSZ	24
+
+struct p9_str {
+	u16 len;
+	char *str;
+};
+
+/* qids are the unique ID for a file (like an inode */
+struct p9_qid {
+	u8 type;
+	u32 version;
+	u64 path;
+};
+
+/* Plan 9 file metadata (stat) structure */
+struct p9_stat {
+	u16 size;
+	u16 type;
+	u32 dev;
+	struct p9_qid qid;
+	u32 mode;
+	u32 atime;
+	u32 mtime;
+	u64 length;
+	struct p9_str name;
+	struct p9_str uid;
+	struct p9_str gid;
+	struct p9_str muid;
+	struct p9_str extension;	/* 9p2000.u extensions */
+	u32 n_uid;			/* 9p2000.u extensions */
+	u32 n_gid;			/* 9p2000.u extensions */
+	u32 n_muid;			/* 9p2000.u extensions */
+};
+
+/* file metadata (stat) structure used to create Twstat message
+   The is similar to p9_stat, but the strings don't point to
+   the same memory block and should be freed separately
+*/
+struct p9_wstat {
+	u16 size;
+	u16 type;
+	u32 dev;
+	struct p9_qid qid;
+	u32 mode;
+	u32 atime;
+	u32 mtime;
+	u64 length;
+	char *name;
+	char *uid;
+	char *gid;
+	char *muid;
+	char *extension;	/* 9p2000.u extensions */
+	u32 n_uid;		/* 9p2000.u extensions */
+	u32 n_gid;		/* 9p2000.u extensions */
+	u32 n_muid;		/* 9p2000.u extensions */
+};
+
+/* Structures for Protocol Operations */
+struct p9_tversion {
+	u32 msize;
+	struct p9_str version;
+};
+
+struct p9_rversion {
+	u32 msize;
+	struct p9_str version;
+};
+
+struct p9_tauth {
+	u32 afid;
+	struct p9_str uname;
+	struct p9_str aname;
+};
+
+struct p9_rauth {
+	struct p9_qid qid;
+};
+
+struct p9_rerror {
+	struct p9_str error;
+	u32 errno;		/* 9p2000.u extension */
+};
+
+struct p9_tflush {
+	u16 oldtag;
+};
+
+struct p9_rflush {
+};
+
+struct p9_tattach {
+	u32 fid;
+	u32 afid;
+	struct p9_str uname;
+	struct p9_str aname;
+};
+
+struct p9_rattach {
+	struct p9_qid qid;
+};
+
+struct p9_twalk {
+	u32 fid;
+	u32 newfid;
+	u16 nwname;
+	struct p9_str wnames[16];
+};
+
+struct p9_rwalk {
+	u16 nwqid;
+	struct p9_qid wqids[16];
+};
+
+struct p9_topen {
+	u32 fid;
+	u8 mode;
+};
+
+struct p9_ropen {
+	struct p9_qid qid;
+	u32 iounit;
+};
+
+struct p9_tcreate {
+	u32 fid;
+	struct p9_str name;
+	u32 perm;
+	u8 mode;
+	struct p9_str extension;
+};
+
+struct p9_rcreate {
+	struct p9_qid qid;
+	u32 iounit;
+};
+
+struct p9_tread {
+	u32 fid;
+	u64 offset;
+	u32 count;
+};
+
+struct p9_rread {
+	u32 count;
+	u8 *data;
+};
+
+struct p9_twrite {
+	u32 fid;
+	u64 offset;
+	u32 count;
+	u8 *data;
+};
+
+struct p9_rwrite {
+	u32 count;
+};
+
+struct p9_tclunk {
+	u32 fid;
+};
+
+struct p9_rclunk {
+};
+
+struct p9_tremove {
+	u32 fid;
+};
+
+struct p9_rremove {
+};
+
+struct p9_tstat {
+	u32 fid;
+};
+
+struct p9_rstat {
+	struct p9_stat stat;
+};
+
+struct p9_twstat {
+	u32 fid;
+	struct p9_stat stat;
+};
+
+struct p9_rwstat {
+};
+
+/*
+  * fcall is the primary packet structure
+  *
+  */
+
+struct p9_fcall {
+	u32 size;
+	u8 id;
+	u16 tag;
+	void *sdata;
+
+	union {
+		struct p9_tversion tversion;
+		struct p9_rversion rversion;
+		struct p9_tauth tauth;
+		struct p9_rauth rauth;
+		struct p9_rerror rerror;
+		struct p9_tflush tflush;
+		struct p9_rflush rflush;
+		struct p9_tattach tattach;
+		struct p9_rattach rattach;
+		struct p9_twalk twalk;
+		struct p9_rwalk rwalk;
+		struct p9_topen topen;
+		struct p9_ropen ropen;
+		struct p9_tcreate tcreate;
+		struct p9_rcreate rcreate;
+		struct p9_tread tread;
+		struct p9_rread rread;
+		struct p9_twrite twrite;
+		struct p9_rwrite rwrite;
+		struct p9_tclunk tclunk;
+		struct p9_rclunk rclunk;
+		struct p9_tremove tremove;
+		struct p9_rremove rremove;
+		struct p9_tstat tstat;
+		struct p9_rstat rstat;
+		struct p9_twstat twstat;
+		struct p9_rwstat rwstat;
+	} params;
+};
+
+struct p9_idpool;
+
+int p9_deserialize_stat(void *buf, u32 buflen, struct p9_stat *stat,
+	int dotu);
+int p9_deserialize_fcall(void *buf, u32 buflen, struct p9_fcall *fc, int dotu);
+void p9_set_tag(struct p9_fcall *fc, u16 tag);
+struct p9_fcall *p9_create_tversion(u32 msize, char *version);
+struct p9_fcall *p9_create_tattach(u32 fid, u32 afid, char *uname,
+	char *aname);
+struct p9_fcall *p9_create_tauth(u32 afid, char *uname, char *aname);
+struct p9_fcall *p9_create_tflush(u16 oldtag);
+struct p9_fcall *p9_create_twalk(u32 fid, u32 newfid, u16 nwname,
+	char **wnames);
+struct p9_fcall *p9_create_topen(u32 fid, u8 mode);
+struct p9_fcall *p9_create_tcreate(u32 fid, char *name, u32 perm, u8 mode,
+	char *extension, int dotu);
+struct p9_fcall *p9_create_tread(u32 fid, u64 offset, u32 count);
+struct p9_fcall *p9_create_twrite(u32 fid, u64 offset, u32 count,
+	const char *data);
+struct p9_fcall *p9_create_twrite_u(u32 fid, u64 offset, u32 count,
+	const char __user *data);
+struct p9_fcall *p9_create_tclunk(u32 fid);
+struct p9_fcall *p9_create_tremove(u32 fid);
+struct p9_fcall *p9_create_tstat(u32 fid);
+struct p9_fcall *p9_create_twstat(u32 fid, struct p9_wstat *wstat,
+	int dotu);
+
+int p9_printfcall(char *buf, int buflen, struct p9_fcall *fc, int dotu);
+int p9_errstr2errno(char *errstr, int len);
+
+struct p9_idpool *p9_idpool_create(void);
+void p9_idpool_destroy(struct p9_idpool *);
+int p9_idpool_get(struct p9_idpool *p);
+void p9_idpool_put(int id, struct p9_idpool *p);
+int p9_idpool_check(int id, struct p9_idpool *p);
+
+int p9_error_init(void);
+int p9_errstr2errno(char *, int);
+int __init p9_sysctl_register(void);
+void __exit p9_sysctl_unregister(void);
+#endif /* NET_9P_H */

include/net/9p/client.h

@@ -0,0 +1,80 @@
+/*
+ * include/net/9p/client.h
+ *
+ * 9P Client Definitions
+ *
+ *  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
+ *
+ */
+
+#ifndef NET_9P_CLIENT_H
+#define NET_9P_CLIENT_H
+
+struct p9_client {
+	spinlock_t lock; /* protect client structure */
+	int msize;
+	unsigned char dotu;
+	struct p9_transport *trans;
+	struct p9_conn *conn;
+
+	struct p9_idpool *fidpool;
+	struct list_head fidlist;
+};
+
+struct p9_fid {
+	struct p9_client *clnt;
+	u32 fid;
+	int mode;
+	struct p9_qid qid;
+	u32 iounit;
+	uid_t uid;
+	void *aux;
+
+	int rdir_fpos;
+	int rdir_pos;
+	struct p9_fcall *rdir_fcall;
+	struct list_head flist;
+	struct list_head dlist;	/* list of all fids attached to a dentry */
+};
+
+struct p9_client *p9_client_create(struct p9_transport *trans, int msize,
+								int dotu);
+void p9_client_destroy(struct p9_client *clnt);
+void p9_client_disconnect(struct p9_client *clnt);
+struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
+						     char *uname, char *aname);
+struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname, char *aname);
+struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
+								int clone);
+int p9_client_open(struct p9_fid *fid, int mode);
+int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
+							char *extension);
+int p9_client_clunk(struct p9_fid *fid);
+int p9_client_remove(struct p9_fid *fid);
+int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count);
+int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count);
+int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count);
+int p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset,
+								u32 count);
+int p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset,
+								u32 count);
+struct p9_stat *p9_client_stat(struct p9_fid *fid);
+int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst);
+struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset);
+
+#endif /* NET_9P_CLIENT_H */

fs/9p/mux.h → include/net/9p/conn.h

@@ -1,7 +1,7 @@
 /*
- * linux/fs/9p/mux.h
+ * include/net/9p/conn.h
  *
- * Multiplexer Definitions
+ * Connection Definitions
  *
  *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
@@ -23,33 +23,35 @@
  *
  */
 
-struct v9fs_mux_data;
-struct v9fs_req;
+#ifndef NET_9P_CONN_H
+#define NET_9P_CONN_H
+
+#undef P9_NONBLOCK
+
+struct p9_conn;
+struct p9_req;
 
 /**
- * v9fs_mux_req_callback - callback function that is called when the
+ * p9_mux_req_callback - callback function that is called when the
  * response of a request is received. The callback is called from
  * a workqueue and shouldn't block.
  *
+ * @req - request
  * @a - the pointer that was specified when the request was send to be
  *      passed to the callback
- * @tc - request call
- * @rc - response call
- * @err - error code (non-zero if error occured)
  */
-typedef void (*v9fs_mux_req_callback)(struct v9fs_req *req, void *a);
+typedef void (*p9_conn_req_callback)(struct p9_req *req, void *a);
 
-int v9fs_mux_global_init(void);
-void v9fs_mux_global_exit(void);
+struct p9_conn *p9_conn_create(struct p9_transport *trans, int msize,
+	unsigned char *dotu);
+void p9_conn_destroy(struct p9_conn *);
+int p9_conn_rpc(struct p9_conn *m, struct p9_fcall *tc, struct p9_fcall **rc);
 
-struct v9fs_mux_data *v9fs_mux_init(struct v9fs_transport *trans, int msize,
-	unsigned char *extended);
-void v9fs_mux_destroy(struct v9fs_mux_data *);
+#ifdef P9_NONBLOCK
+int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc,
+	p9_conn_req_callback cb, void *a);
+#endif /* P9_NONBLOCK */
 
-int v9fs_mux_send(struct v9fs_mux_data *m, struct v9fs_fcall *tc);
-struct v9fs_fcall *v9fs_mux_recv(struct v9fs_mux_data *m);
-int v9fs_mux_rpc(struct v9fs_mux_data *m, struct v9fs_fcall *tc, struct v9fs_fcall **rc);
+void p9_conn_cancel(struct p9_conn *m, int err);
 
-void v9fs_mux_flush(struct v9fs_mux_data *m, int sendflush);
-void v9fs_mux_cancel(struct v9fs_mux_data *m, int err);
-int v9fs_errstr2errno(char *errstr, int len);
+#endif /* NET_9P_CONN_H */

fs/9p/transport.h → include/net/9p/transport.h

@@ -1,5 +1,5 @@
 /*
- * linux/fs/9p/transport.h
+ * include/net/9p/transport.h
  *
  * Transport Definition
  *
@@ -23,23 +23,27 @@
  *
  */
 
-enum v9fs_transport_status {
+#ifndef NET_9P_TRANSPORT_H
+#define NET_9P_TRANSPORT_H
+
+enum p9_transport_status {
 	Connected,
 	Disconnected,
 	Hung,
 };
 
-struct v9fs_transport {
-	enum v9fs_transport_status status;
+struct p9_transport {
+	enum p9_transport_status status;
 	void *priv;
 
-	int (*init) (struct v9fs_session_info *, const char *, char *);
-	int (*write) (struct v9fs_transport *, void *, int);
-	int (*read) (struct v9fs_transport *, void *, int);
-	void (*close) (struct v9fs_transport *);
-	unsigned int (*poll)(struct v9fs_transport *, struct poll_table_struct *);
+	int (*write) (struct p9_transport *, void *, int);
+	int (*read) (struct p9_transport *, void *, int);
+	void (*close) (struct p9_transport *);
+	unsigned int (*poll)(struct p9_transport *, struct poll_table_struct *);
 };
 
-extern struct v9fs_transport v9fs_trans_tcp;
-extern struct v9fs_transport v9fs_trans_unix;
-extern struct v9fs_transport v9fs_trans_fd;
+struct p9_transport *p9_trans_create_tcp(const char *addr, int port);
+struct p9_transport *p9_trans_create_unix(const char *addr);
+struct p9_transport *p9_trans_create_fd(int rfd, int wfd);
+
+#endif /* NET_9P_TRANSPORT_H */

net/9p/Kconfig

@@ -0,0 +1,21 @@
+#
+# 9P protocol configuration
+#
+
+menuconfig NET_9P
+	depends on NET && EXPERIMENTAL
+	tristate "Plan 9 Resource Sharing Support (9P2000) (Experimental)"
+	help
+	  If you say Y here, you will get experimental support for
+	  Plan 9 resource sharing via the 9P2000 protocol.
+
+	  See <http://v9fs.sf.net> for more information.
+
+	  If unsure, say N.
+
+config NET_9P_DEBUG
+	bool "Debug information"
+	depends on NET_9P
+	help
+	  Say Y if you want the 9P subsistem to log debug information.
+

net/9p/Makefile

@@ -0,0 +1,13 @@
+obj-$(CONFIG_NET_9P) := 9p.o
+
+9p-objs := \
+	mod.o \
+	trans_fd.o \
+	mux.o \
+	client.o \
+	conv.o \
+	error.o \
+	fcprint.o \
+	util.o \
+
+9p-$(CONFIG_SYSCTL) += sysctl.o

net/9p/client.c

@@ -0,0 +1,965 @@
+/*
+ * 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 <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_transport *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;
+	}
+
+	if (clnt->fidpool)
+		p9_idpool_destroy(clnt->fidpool);
+
+	list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
+		p9_fid_destroy(fid);
+
+	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, 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);
+	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, 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);
+	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);
+}

fs/9p/conv.c → net/9p/conv.c

@@ -1,5 +1,5 @@
 /*
- * linux/fs/9p/conv.c
+ * net/9p/conv.c
  *
  * 9P protocol conversion functions
  *
@@ -29,11 +29,8 @@
 #include <linux/fs.h>
 #include <linux/sched.h>
 #include <linux/idr.h>
-#include <asm/uaccess.h>
-#include "debug.h"
-#include "v9fs.h"
-#include "9p.h"
-#include "conv.h"
+#include <linux/uaccess.h>
+#include <net/9p/9p.h>
 
 /*
  * Buffer to help with string parsing
@@ -59,8 +56,9 @@ static int buf_check_size(struct cbuf *buf, int len)
 {
 	if (buf->p + len > buf->ep) {
 		if (buf->p < buf->ep) {
-			eprintk(KERN_ERR, "buffer overflow: want %d has %d\n",
-				len, (int)(buf->ep - buf->p));
+			P9_EPRINTK(KERN_ERR,
+				"buffer overflow: want %d has %d\n", len,
+				(int)(buf->ep - buf->p));
 			dump_stack();
 			buf->p = buf->ep + 1;
 		}
@@ -183,7 +181,7 @@ static u64 buf_get_int64(struct cbuf *buf)
 	return ret;
 }
 
-static void buf_get_str(struct cbuf *buf, struct v9fs_str *vstr)
+static void buf_get_str(struct cbuf *buf, struct p9_str *vstr)
 {
 	vstr->len = buf_get_int16(buf);
 	if (!buf_check_overflow(buf) && buf_check_size(buf, vstr->len)) {
@@ -195,7 +193,7 @@ static void buf_get_str(struct cbuf *buf, struct v9fs_str *vstr)
 	}
 }
 
-static void buf_get_qid(struct cbuf *bufp, struct v9fs_qid *qid)
+static void buf_get_qid(struct cbuf *bufp, struct p9_qid *qid)
 {
 	qid->type = buf_get_int8(bufp);
 	qid->version = buf_get_int32(bufp);
@@ -203,18 +201,18 @@ static void buf_get_qid(struct cbuf *bufp, struct v9fs_qid *qid)
 }
 
 /**
- * v9fs_size_wstat - calculate the size of a variable length stat struct
+ * p9_size_wstat - calculate the size of a variable length stat struct
  * @stat: metadata (stat) structure
- * @extended: non-zero if 9P2000.u
+ * @dotu: non-zero if 9P2000.u
  *
  */
 
-static int v9fs_size_wstat(struct v9fs_wstat *wstat, int extended)
+static int p9_size_wstat(struct p9_wstat *wstat, int dotu)
 {
 	int size = 0;
 
 	if (wstat == NULL) {
-		eprintk(KERN_ERR, "v9fs_size_stat: got a NULL stat pointer\n");
+		P9_EPRINTK(KERN_ERR, "p9_size_stat: got a NULL stat pointer\n");
 		return 0;
 	}
 
@@ -239,7 +237,7 @@ static int v9fs_size_wstat(struct v9fs_wstat *wstat, int extended)
 	if (wstat->muid)
 		size += strlen(wstat->muid);
 
-	if (extended) {
+	if (dotu) {
 		size += 4 +	/* n_uid[4] */
 		    4 +		/* n_gid[4] */
 		    4 +		/* n_muid[4] */
@@ -255,12 +253,12 @@ static int v9fs_size_wstat(struct v9fs_wstat *wstat, int extended)
  * buf_get_stat - safely decode a recieved metadata (stat) structure
  * @bufp: buffer to deserialize
  * @stat: metadata (stat) structure
- * @extended: non-zero if 9P2000.u
+ * @dotu: non-zero if 9P2000.u
  *
  */
 
 static void
-buf_get_stat(struct cbuf *bufp, struct v9fs_stat *stat, int extended)
+buf_get_stat(struct cbuf *bufp, struct p9_stat *stat, int dotu)
 {
 	stat->size = buf_get_int16(bufp);
 	stat->type = buf_get_int16(bufp);
@@ -277,7 +275,7 @@ buf_get_stat(struct cbuf *bufp, struct v9fs_stat *stat, int extended)
 	buf_get_str(bufp, &stat->gid);
 	buf_get_str(bufp, &stat->muid);
 
-	if (extended) {
+	if (dotu) {
 		buf_get_str(bufp, &stat->extension);
 		stat->n_uid = buf_get_int32(bufp);
 		stat->n_gid = buf_get_int32(bufp);
@@ -286,18 +284,18 @@ buf_get_stat(struct cbuf *bufp, struct v9fs_stat *stat, int extended)
 }
 
 /**
- * v9fs_deserialize_stat - decode a received metadata structure
+ * p9_deserialize_stat - decode a received metadata structure
  * @buf: buffer to deserialize
  * @buflen: length of received buffer
  * @stat: metadata structure to decode into
- * @extended: non-zero if 9P2000.u
+ * @dotu: non-zero if 9P2000.u
  *
  * Note: stat will point to the buf region.
  */
 
 int
-v9fs_deserialize_stat(void *buf, u32 buflen, struct v9fs_stat *stat,
-		int extended)
+p9_deserialize_stat(void *buf, u32 buflen, struct p9_stat *stat,
+		int dotu)
 {
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
@@ -305,13 +303,14 @@ v9fs_deserialize_stat(void *buf, u32 buflen, struct v9fs_stat *stat,
 
 	buf_init(bufp, buf, buflen);
 	p = bufp->p;
-	buf_get_stat(bufp, stat, extended);
+	buf_get_stat(bufp, stat, dotu);
 
 	if (buf_check_overflow(bufp))
 		return 0;
 	else
 		return bufp->p - p;
 }
+EXPORT_SYMBOL(p9_deserialize_stat);
 
 /**
  * deserialize_fcall - unmarshal a response
@@ -319,13 +318,13 @@ v9fs_deserialize_stat(void *buf, u32 buflen, struct v9fs_stat *stat,
  * @buflen: length of received buffer
  * @rcall: fcall structure to populate
  * @rcalllen: length of fcall structure to populate
- * @extended: non-zero if 9P2000.u
+ * @dotu: non-zero if 9P2000.u
  *
  */
 
 int
-v9fs_deserialize_fcall(void *buf, u32 buflen, struct v9fs_fcall *rcall,
-		       int extended)
+p9_deserialize_fcall(void *buf, u32 buflen, struct p9_fcall *rcall,
+		       int dotu)
 {
 
 	struct cbuf buffer;
@@ -338,102 +337,104 @@ v9fs_deserialize_fcall(void *buf, u32 buflen, struct v9fs_fcall *rcall,
 	rcall->id = buf_get_int8(bufp);
 	rcall->tag = buf_get_int16(bufp);
 
-	dprintk(DEBUG_CONV, "size %d id %d tag %d\n", rcall->size, rcall->id,
-		rcall->tag);
+	P9_DPRINTK(P9_DEBUG_CONV, "size %d id %d tag %d\n", rcall->size,
+							rcall->id, rcall->tag);
 
 	switch (rcall->id) {
 	default:
-		eprintk(KERN_ERR, "unknown message type: %d\n", rcall->id);
+		P9_EPRINTK(KERN_ERR, "unknown message type: %d\n", rcall->id);
 		return -EPROTO;
-	case RVERSION:
+	case P9_RVERSION:
 		rcall->params.rversion.msize = buf_get_int32(bufp);
 		buf_get_str(bufp, &rcall->params.rversion.version);
 		break;
-	case RFLUSH:
+	case P9_RFLUSH:
 		break;
-	case RATTACH:
+	case P9_RATTACH:
 		rcall->params.rattach.qid.type = buf_get_int8(bufp);
 		rcall->params.rattach.qid.version = buf_get_int32(bufp);
 		rcall->params.rattach.qid.path = buf_get_int64(bufp);
 		break;
-	case RWALK:
+	case P9_RWALK:
 		rcall->params.rwalk.nwqid = buf_get_int16(bufp);
-		if (rcall->params.rwalk.nwqid > V9FS_MAXWELEM) {
-			eprintk(KERN_ERR, "Rwalk with more than %d qids: %d\n",
-				V9FS_MAXWELEM, rcall->params.rwalk.nwqid);
+		if (rcall->params.rwalk.nwqid > P9_MAXWELEM) {
+			P9_EPRINTK(KERN_ERR,
+					"Rwalk with more than %d qids: %d\n",
+					P9_MAXWELEM, rcall->params.rwalk.nwqid);
 			return -EPROTO;
 		}
 
 		for (i = 0; i < rcall->params.rwalk.nwqid; i++)
 			buf_get_qid(bufp, &rcall->params.rwalk.wqids[i]);
 		break;
-	case ROPEN:
+	case P9_ROPEN:
 		buf_get_qid(bufp, &rcall->params.ropen.qid);
 		rcall->params.ropen.iounit = buf_get_int32(bufp);
 		break;
-	case RCREATE:
+	case P9_RCREATE:
 		buf_get_qid(bufp, &rcall->params.rcreate.qid);
 		rcall->params.rcreate.iounit = buf_get_int32(bufp);
 		break;
-	case RREAD:
+	case P9_RREAD:
 		rcall->params.rread.count = buf_get_int32(bufp);
 		rcall->params.rread.data = bufp->p;
 		buf_check_size(bufp, rcall->params.rread.count);
 		break;
-	case RWRITE:
+	case P9_RWRITE:
 		rcall->params.rwrite.count = buf_get_int32(bufp);
 		break;
-	case RCLUNK:
+	case P9_RCLUNK:
 		break;
-	case RREMOVE:
+	case P9_RREMOVE:
 		break;
-	case RSTAT:
+	case P9_RSTAT:
 		buf_get_int16(bufp);
-		buf_get_stat(bufp, &rcall->params.rstat.stat, extended);
+		buf_get_stat(bufp, &rcall->params.rstat.stat, dotu);
 		break;
-	case RWSTAT:
+	case P9_RWSTAT:
 		break;
-	case RERROR:
+	case P9_RERROR:
 		buf_get_str(bufp, &rcall->params.rerror.error);
-		if (extended)
+		if (dotu)
 			rcall->params.rerror.errno = buf_get_int16(bufp);
 		break;
 	}
 
 	if (buf_check_overflow(bufp)) {
-		dprintk(DEBUG_ERROR, "buffer overflow\n");
+		P9_DPRINTK(P9_DEBUG_ERROR, "buffer overflow\n");
 		return -EIO;
 	}
 
 	return bufp->p - bufp->sp;
 }
+EXPORT_SYMBOL(p9_deserialize_fcall);
 
-static inline void v9fs_put_int8(struct cbuf *bufp, u8 val, u8 * p)
+static inline void p9_put_int8(struct cbuf *bufp, u8 val, u8 * p)
 {
 	*p = val;
 	buf_put_int8(bufp, val);
 }
 
-static inline void v9fs_put_int16(struct cbuf *bufp, u16 val, u16 * p)
+static inline void p9_put_int16(struct cbuf *bufp, u16 val, u16 * p)
 {
 	*p = val;
 	buf_put_int16(bufp, val);
 }
 
-static inline void v9fs_put_int32(struct cbuf *bufp, u32 val, u32 * p)
+static inline void p9_put_int32(struct cbuf *bufp, u32 val, u32 * p)
 {
 	*p = val;
 	buf_put_int32(bufp, val);
 }
 
-static inline void v9fs_put_int64(struct cbuf *bufp, u64 val, u64 * p)
+static inline void p9_put_int64(struct cbuf *bufp, u64 val, u64 * p)
 {
 	*p = val;
 	buf_put_int64(bufp, val);
 }
 
 static void
-v9fs_put_str(struct cbuf *bufp, char *data, struct v9fs_str *str)
+p9_put_str(struct cbuf *bufp, char *data, struct p9_str *str)
 {
 	int len;
 	char *s;
@@ -451,7 +452,16 @@ v9fs_put_str(struct cbuf *bufp, char *data, struct v9fs_str *str)
 }
 
 static int
-v9fs_put_user_data(struct cbuf *bufp, const char __user * data, int count,
+p9_put_data(struct cbuf *bufp, const char *data, int count,
+		   unsigned char **pdata)
+{
+	*pdata = buf_alloc(bufp, count);
+	memmove(*pdata, data, count);
+	return count;
+}
+
+static int
+p9_put_user_data(struct cbuf *bufp, const char __user *data, int count,
 		   unsigned char **pdata)
 {
 	*pdata = buf_alloc(bufp, count);
@@ -459,162 +469,167 @@ v9fs_put_user_data(struct cbuf *bufp, const char __user * data, int count,
 }
 
 static void
-v9fs_put_wstat(struct cbuf *bufp, struct v9fs_wstat *wstat,
-	       struct v9fs_stat *stat, int statsz, int extended)
+p9_put_wstat(struct cbuf *bufp, struct p9_wstat *wstat,
+	       struct p9_stat *stat, int statsz, int dotu)
 {
-	v9fs_put_int16(bufp, statsz, &stat->size);
-	v9fs_put_int16(bufp, wstat->type, &stat->type);
-	v9fs_put_int32(bufp, wstat->dev, &stat->dev);
-	v9fs_put_int8(bufp, wstat->qid.type, &stat->qid.type);
-	v9fs_put_int32(bufp, wstat->qid.version, &stat->qid.version);
-	v9fs_put_int64(bufp, wstat->qid.path, &stat->qid.path);
-	v9fs_put_int32(bufp, wstat->mode, &stat->mode);
-	v9fs_put_int32(bufp, wstat->atime, &stat->atime);
-	v9fs_put_int32(bufp, wstat->mtime, &stat->mtime);
-	v9fs_put_int64(bufp, wstat->length, &stat->length);
+	p9_put_int16(bufp, statsz, &stat->size);
+	p9_put_int16(bufp, wstat->type, &stat->type);
+	p9_put_int32(bufp, wstat->dev, &stat->dev);
+	p9_put_int8(bufp, wstat->qid.type, &stat->qid.type);
+	p9_put_int32(bufp, wstat->qid.version, &stat->qid.version);
+	p9_put_int64(bufp, wstat->qid.path, &stat->qid.path);
+	p9_put_int32(bufp, wstat->mode, &stat->mode);
+	p9_put_int32(bufp, wstat->atime, &stat->atime);
+	p9_put_int32(bufp, wstat->mtime, &stat->mtime);
+	p9_put_int64(bufp, wstat->length, &stat->length);
 
-	v9fs_put_str(bufp, wstat->name, &stat->name);
-	v9fs_put_str(bufp, wstat->uid, &stat->uid);
-	v9fs_put_str(bufp, wstat->gid, &stat->gid);
-	v9fs_put_str(bufp, wstat->muid, &stat->muid);
+	p9_put_str(bufp, wstat->name, &stat->name);
+	p9_put_str(bufp, wstat->uid, &stat->uid);
+	p9_put_str(bufp, wstat->gid, &stat->gid);
+	p9_put_str(bufp, wstat->muid, &stat->muid);
 
-	if (extended) {
-		v9fs_put_str(bufp, wstat->extension, &stat->extension);
-		v9fs_put_int32(bufp, wstat->n_uid, &stat->n_uid);
-		v9fs_put_int32(bufp, wstat->n_gid, &stat->n_gid);
-		v9fs_put_int32(bufp, wstat->n_muid, &stat->n_muid);
+	if (dotu) {
+		p9_put_str(bufp, wstat->extension, &stat->extension);
+		p9_put_int32(bufp, wstat->n_uid, &stat->n_uid);
+		p9_put_int32(bufp, wstat->n_gid, &stat->n_gid);
+		p9_put_int32(bufp, wstat->n_muid, &stat->n_muid);
 	}
 }
 
-static struct v9fs_fcall *
-v9fs_create_common(struct cbuf *bufp, u32 size, u8 id)
+static struct p9_fcall *
+p9_create_common(struct cbuf *bufp, u32 size, u8 id)
 {
-	struct v9fs_fcall *fc;
+	struct p9_fcall *fc;
 
 	size += 4 + 1 + 2;	/* size[4] id[1] tag[2] */
-	fc = kmalloc(sizeof(struct v9fs_fcall) + size, GFP_KERNEL);
+	fc = kmalloc(sizeof(struct p9_fcall) + size, GFP_KERNEL);
 	if (!fc)
 		return ERR_PTR(-ENOMEM);
 
 	fc->sdata = (char *)fc + sizeof(*fc);
 
 	buf_init(bufp, (char *)fc->sdata, size);
-	v9fs_put_int32(bufp, size, &fc->size);
-	v9fs_put_int8(bufp, id, &fc->id);
-	v9fs_put_int16(bufp, V9FS_NOTAG, &fc->tag);
+	p9_put_int32(bufp, size, &fc->size);
+	p9_put_int8(bufp, id, &fc->id);
+	p9_put_int16(bufp, P9_NOTAG, &fc->tag);
 
 	return fc;
 }
 
-void v9fs_set_tag(struct v9fs_fcall *fc, u16 tag)
+void p9_set_tag(struct p9_fcall *fc, u16 tag)
 {
 	fc->tag = tag;
 	*(__le16 *) (fc->sdata + 5) = cpu_to_le16(tag);
 }
+EXPORT_SYMBOL(p9_set_tag);
 
-struct v9fs_fcall *v9fs_create_tversion(u32 msize, char *version)
+struct p9_fcall *p9_create_tversion(u32 msize, char *version)
 {
 	int size;
-	struct v9fs_fcall *fc;
+	struct p9_fcall *fc;
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
 
 	size = 4 + 2 + strlen(version);	/* msize[4] version[s] */
-	fc = v9fs_create_common(bufp, size, TVERSION);
+	fc = p9_create_common(bufp, size, P9_TVERSION);
 	if (IS_ERR(fc))
 		goto error;
 
-	v9fs_put_int32(bufp, msize, &fc->params.tversion.msize);
-	v9fs_put_str(bufp, version, &fc->params.tversion.version);
+	p9_put_int32(bufp, msize, &fc->params.tversion.msize);
+	p9_put_str(bufp, version, &fc->params.tversion.version);
 
 	if (buf_check_overflow(bufp)) {
 		kfree(fc);
 		fc = ERR_PTR(-ENOMEM);
 	}
-      error:
+error:
 	return fc;
 }
+EXPORT_SYMBOL(p9_create_tversion);
 
-#if 0
-struct v9fs_fcall *v9fs_create_tauth(u32 afid, char *uname, char *aname)
+struct p9_fcall *p9_create_tauth(u32 afid, char *uname, char *aname)
 {
 	int size;
-	struct v9fs_fcall *fc;
+	struct p9_fcall *fc;
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
 
-	size = 4 + 2 + strlen(uname) + 2 + strlen(aname);	/* afid[4] uname[s] aname[s] */
-	fc = v9fs_create_common(bufp, size, TAUTH);
+	/* afid[4] uname[s] aname[s] */
+	size = 4 + 2 + strlen(uname) + 2 + strlen(aname);
+	fc = p9_create_common(bufp, size, P9_TAUTH);
 	if (IS_ERR(fc))
 		goto error;
 
-	v9fs_put_int32(bufp, afid, &fc->params.tauth.afid);
-	v9fs_put_str(bufp, uname, &fc->params.tauth.uname);
-	v9fs_put_str(bufp, aname, &fc->params.tauth.aname);
+	p9_put_int32(bufp, afid, &fc->params.tauth.afid);
+	p9_put_str(bufp, uname, &fc->params.tauth.uname);
+	p9_put_str(bufp, aname, &fc->params.tauth.aname);
 
 	if (buf_check_overflow(bufp)) {
 		kfree(fc);
 		fc = ERR_PTR(-ENOMEM);
 	}
-      error:
+error:
 	return fc;
 }
-#endif  /*  0  */
+EXPORT_SYMBOL(p9_create_tauth);
 
-struct v9fs_fcall *
-v9fs_create_tattach(u32 fid, u32 afid, char *uname, char *aname)
+struct p9_fcall *
+p9_create_tattach(u32 fid, u32 afid, char *uname, char *aname)
 {
 	int size;
-	struct v9fs_fcall *fc;
+	struct p9_fcall *fc;
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
 
-	size = 4 + 4 + 2 + strlen(uname) + 2 + strlen(aname);	/* fid[4] afid[4] uname[s] aname[s] */
-	fc = v9fs_create_common(bufp, size, TATTACH);
+	/* fid[4] afid[4] uname[s] aname[s] */
+	size = 4 + 4 + 2 + strlen(uname) + 2 + strlen(aname);
+	fc = p9_create_common(bufp, size, P9_TATTACH);
 	if (IS_ERR(fc))
 		goto error;
 
-	v9fs_put_int32(bufp, fid, &fc->params.tattach.fid);
-	v9fs_put_int32(bufp, afid, &fc->params.tattach.afid);
-	v9fs_put_str(bufp, uname, &fc->params.tattach.uname);
-	v9fs_put_str(bufp, aname, &fc->params.tattach.aname);
+	p9_put_int32(bufp, fid, &fc->params.tattach.fid);
+	p9_put_int32(bufp, afid, &fc->params.tattach.afid);
+	p9_put_str(bufp, uname, &fc->params.tattach.uname);
+	p9_put_str(bufp, aname, &fc->params.tattach.aname);
 
-      error:
+error:
 	return fc;
 }
+EXPORT_SYMBOL(p9_create_tattach);
 
-struct v9fs_fcall *v9fs_create_tflush(u16 oldtag)
+struct p9_fcall *p9_create_tflush(u16 oldtag)
 {
 	int size;
-	struct v9fs_fcall *fc;
+	struct p9_fcall *fc;
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
 
 	size = 2;		/* oldtag[2] */
-	fc = v9fs_create_common(bufp, size, TFLUSH);
+	fc = p9_create_common(bufp, size, P9_TFLUSH);
 	if (IS_ERR(fc))
 		goto error;
 
-	v9fs_put_int16(bufp, oldtag, &fc->params.tflush.oldtag);
+	p9_put_int16(bufp, oldtag, &fc->params.tflush.oldtag);
 
 	if (buf_check_overflow(bufp)) {
 		kfree(fc);
 		fc = ERR_PTR(-ENOMEM);
 	}
-      error:
+error:
 	return fc;
 }
+EXPORT_SYMBOL(p9_create_tflush);
 
-struct v9fs_fcall *v9fs_create_twalk(u32 fid, u32 newfid, u16 nwname,
+struct p9_fcall *p9_create_twalk(u32 fid, u32 newfid, u16 nwname,
 				     char **wnames)
 {
 	int i, size;
-	struct v9fs_fcall *fc;
+	struct p9_fcall *fc;
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
 
-	if (nwname > V9FS_MAXWELEM) {
-		dprintk(DEBUG_ERROR, "nwname > %d\n", V9FS_MAXWELEM);
+	if (nwname > P9_MAXWELEM) {
+		P9_DPRINTK(P9_DEBUG_ERROR, "nwname > %d\n", P9_MAXWELEM);
 		return NULL;
 	}
 
@@ -623,122 +638,160 @@ struct v9fs_fcall *v9fs_create_twalk(u32 fid, u32 newfid, u16 nwname,
 		size += 2 + strlen(wnames[i]);	/* wname[s] */
 	}
 
-	fc = v9fs_create_common(bufp, size, TWALK);
+	fc = p9_create_common(bufp, size, P9_TWALK);
 	if (IS_ERR(fc))
 		goto error;
 
-	v9fs_put_int32(bufp, fid, &fc->params.twalk.fid);
-	v9fs_put_int32(bufp, newfid, &fc->params.twalk.newfid);
-	v9fs_put_int16(bufp, nwname, &fc->params.twalk.nwname);
+	p9_put_int32(bufp, fid, &fc->params.twalk.fid);
+	p9_put_int32(bufp, newfid, &fc->params.twalk.newfid);
+	p9_put_int16(bufp, nwname, &fc->params.twalk.nwname);
 	for (i = 0; i < nwname; i++) {
-		v9fs_put_str(bufp, wnames[i], &fc->params.twalk.wnames[i]);
+		p9_put_str(bufp, wnames[i], &fc->params.twalk.wnames[i]);
 	}
 
 	if (buf_check_overflow(bufp)) {
 		kfree(fc);
 		fc = ERR_PTR(-ENOMEM);
 	}
-      error:
+error:
 	return fc;
 }
+EXPORT_SYMBOL(p9_create_twalk);
 
-struct v9fs_fcall *v9fs_create_topen(u32 fid, u8 mode)
+struct p9_fcall *p9_create_topen(u32 fid, u8 mode)
 {
 	int size;
-	struct v9fs_fcall *fc;
+	struct p9_fcall *fc;
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
 
 	size = 4 + 1;		/* fid[4] mode[1] */
-	fc = v9fs_create_common(bufp, size, TOPEN);
+	fc = p9_create_common(bufp, size, P9_TOPEN);
 	if (IS_ERR(fc))
 		goto error;
 
-	v9fs_put_int32(bufp, fid, &fc->params.topen.fid);
-	v9fs_put_int8(bufp, mode, &fc->params.topen.mode);
+	p9_put_int32(bufp, fid, &fc->params.topen.fid);
+	p9_put_int8(bufp, mode, &fc->params.topen.mode);
 
 	if (buf_check_overflow(bufp)) {
 		kfree(fc);
 		fc = ERR_PTR(-ENOMEM);
 	}
-      error:
+error:
 	return fc;
 }
+EXPORT_SYMBOL(p9_create_topen);
 
-struct v9fs_fcall *v9fs_create_tcreate(u32 fid, char *name, u32 perm, u8 mode,
-	char *extension, int extended)
+struct p9_fcall *p9_create_tcreate(u32 fid, char *name, u32 perm, u8 mode,
+	char *extension, int dotu)
 {
 	int size;
-	struct v9fs_fcall *fc;
+	struct p9_fcall *fc;
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
 
-	size = 4 + 2 + strlen(name) + 4 + 1;	/* fid[4] name[s] perm[4] mode[1] */
-	if (extended) {
+	/* fid[4] name[s] perm[4] mode[1] */
+	size = 4 + 2 + strlen(name) + 4 + 1;
+	if (dotu) {
 		size += 2 +			/* extension[s] */
 		    (extension == NULL ? 0 : strlen(extension));
 	}
 
-	fc = v9fs_create_common(bufp, size, TCREATE);
+	fc = p9_create_common(bufp, size, P9_TCREATE);
 	if (IS_ERR(fc))
 		goto error;
 
-	v9fs_put_int32(bufp, fid, &fc->params.tcreate.fid);
-	v9fs_put_str(bufp, name, &fc->params.tcreate.name);
-	v9fs_put_int32(bufp, perm, &fc->params.tcreate.perm);
-	v9fs_put_int8(bufp, mode, &fc->params.tcreate.mode);
-	if (extended)
-		v9fs_put_str(bufp, extension, &fc->params.tcreate.extension);
+	p9_put_int32(bufp, fid, &fc->params.tcreate.fid);
+	p9_put_str(bufp, name, &fc->params.tcreate.name);
+	p9_put_int32(bufp, perm, &fc->params.tcreate.perm);
+	p9_put_int8(bufp, mode, &fc->params.tcreate.mode);
+	if (dotu)
+		p9_put_str(bufp, extension, &fc->params.tcreate.extension);
 
 	if (buf_check_overflow(bufp)) {
 		kfree(fc);
 		fc = ERR_PTR(-ENOMEM);
 	}
-      error:
+error:
 	return fc;
 }
+EXPORT_SYMBOL(p9_create_tcreate);
 
-struct v9fs_fcall *v9fs_create_tread(u32 fid, u64 offset, u32 count)
+struct p9_fcall *p9_create_tread(u32 fid, u64 offset, u32 count)
 {
 	int size;
-	struct v9fs_fcall *fc;
+	struct p9_fcall *fc;
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
 
 	size = 4 + 8 + 4;	/* fid[4] offset[8] count[4] */
-	fc = v9fs_create_common(bufp, size, TREAD);
+	fc = p9_create_common(bufp, size, P9_TREAD);
+	if (IS_ERR(fc))
+		goto error;
+
+	p9_put_int32(bufp, fid, &fc->params.tread.fid);
+	p9_put_int64(bufp, offset, &fc->params.tread.offset);
+	p9_put_int32(bufp, count, &fc->params.tread.count);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+error:
+	return fc;
+}
+EXPORT_SYMBOL(p9_create_tread);
+
+struct p9_fcall *p9_create_twrite(u32 fid, u64 offset, u32 count,
+				      const char *data)
+{
+	int size, err;
+	struct p9_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	/* fid[4] offset[8] count[4] data[count] */
+	size = 4 + 8 + 4 + count;
+	fc = p9_create_common(bufp, size, P9_TWRITE);
 	if (IS_ERR(fc))
 		goto error;
 
-	v9fs_put_int32(bufp, fid, &fc->params.tread.fid);
-	v9fs_put_int64(bufp, offset, &fc->params.tread.offset);
-	v9fs_put_int32(bufp, count, &fc->params.tread.count);
+	p9_put_int32(bufp, fid, &fc->params.twrite.fid);
+	p9_put_int64(bufp, offset, &fc->params.twrite.offset);
+	p9_put_int32(bufp, count, &fc->params.twrite.count);
+	err = p9_put_data(bufp, data, count, &fc->params.twrite.data);
+	if (err) {
+		kfree(fc);
+		fc = ERR_PTR(err);
+	}
 
 	if (buf_check_overflow(bufp)) {
 		kfree(fc);
 		fc = ERR_PTR(-ENOMEM);
 	}
-      error:
+error:
 	return fc;
 }
+EXPORT_SYMBOL(p9_create_twrite);
 
-struct v9fs_fcall *v9fs_create_twrite(u32 fid, u64 offset, u32 count,
-				      const char __user * data)
+struct p9_fcall *p9_create_twrite_u(u32 fid, u64 offset, u32 count,
+				      const char __user *data)
 {
 	int size, err;
-	struct v9fs_fcall *fc;
+	struct p9_fcall *fc;
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
 
-	size = 4 + 8 + 4 + count;	/* fid[4] offset[8] count[4] data[count] */
-	fc = v9fs_create_common(bufp, size, TWRITE);
+	/* fid[4] offset[8] count[4] data[count] */
+	size = 4 + 8 + 4 + count;
+	fc = p9_create_common(bufp, size, P9_TWRITE);
 	if (IS_ERR(fc))
 		goto error;
 
-	v9fs_put_int32(bufp, fid, &fc->params.twrite.fid);
-	v9fs_put_int64(bufp, offset, &fc->params.twrite.offset);
-	v9fs_put_int32(bufp, count, &fc->params.twrite.count);
-	err = v9fs_put_user_data(bufp, data, count, &fc->params.twrite.data);
+	p9_put_int32(bufp, fid, &fc->params.twrite.fid);
+	p9_put_int64(bufp, offset, &fc->params.twrite.offset);
+	p9_put_int32(bufp, count, &fc->params.twrite.count);
+	err = p9_put_user_data(bufp, data, count, &fc->params.twrite.data);
 	if (err) {
 		kfree(fc);
 		fc = ERR_PTR(err);
@@ -748,98 +801,103 @@ struct v9fs_fcall *v9fs_create_twrite(u32 fid, u64 offset, u32 count,
 		kfree(fc);
 		fc = ERR_PTR(-ENOMEM);
 	}
-      error:
+error:
 	return fc;
 }
+EXPORT_SYMBOL(p9_create_twrite_u);
 
-struct v9fs_fcall *v9fs_create_tclunk(u32 fid)
+struct p9_fcall *p9_create_tclunk(u32 fid)
 {
 	int size;
-	struct v9fs_fcall *fc;
+	struct p9_fcall *fc;
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
 
 	size = 4;		/* fid[4] */
-	fc = v9fs_create_common(bufp, size, TCLUNK);
+	fc = p9_create_common(bufp, size, P9_TCLUNK);
 	if (IS_ERR(fc))
 		goto error;
 
-	v9fs_put_int32(bufp, fid, &fc->params.tclunk.fid);
+	p9_put_int32(bufp, fid, &fc->params.tclunk.fid);
 
 	if (buf_check_overflow(bufp)) {
 		kfree(fc);
 		fc = ERR_PTR(-ENOMEM);
 	}
-      error:
+error:
 	return fc;
 }
+EXPORT_SYMBOL(p9_create_tclunk);
 
-struct v9fs_fcall *v9fs_create_tremove(u32 fid)
+struct p9_fcall *p9_create_tremove(u32 fid)
 {
 	int size;
-	struct v9fs_fcall *fc;
+	struct p9_fcall *fc;
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
 
 	size = 4;		/* fid[4] */
-	fc = v9fs_create_common(bufp, size, TREMOVE);
+	fc = p9_create_common(bufp, size, P9_TREMOVE);
 	if (IS_ERR(fc))
 		goto error;
 
-	v9fs_put_int32(bufp, fid, &fc->params.tremove.fid);
+	p9_put_int32(bufp, fid, &fc->params.tremove.fid);
 
 	if (buf_check_overflow(bufp)) {
 		kfree(fc);
 		fc = ERR_PTR(-ENOMEM);
 	}
-      error:
+error:
 	return fc;
 }
+EXPORT_SYMBOL(p9_create_tremove);
 
-struct v9fs_fcall *v9fs_create_tstat(u32 fid)
+struct p9_fcall *p9_create_tstat(u32 fid)
 {
 	int size;
-	struct v9fs_fcall *fc;
+	struct p9_fcall *fc;
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
 
 	size = 4;		/* fid[4] */
-	fc = v9fs_create_common(bufp, size, TSTAT);
+	fc = p9_create_common(bufp, size, P9_TSTAT);
 	if (IS_ERR(fc))
 		goto error;
 
-	v9fs_put_int32(bufp, fid, &fc->params.tstat.fid);
+	p9_put_int32(bufp, fid, &fc->params.tstat.fid);
 
 	if (buf_check_overflow(bufp)) {
 		kfree(fc);
 		fc = ERR_PTR(-ENOMEM);
 	}
-      error:
+error:
 	return fc;
 }
+EXPORT_SYMBOL(p9_create_tstat);
 
-struct v9fs_fcall *v9fs_create_twstat(u32 fid, struct v9fs_wstat *wstat,
-				      int extended)
+struct p9_fcall *p9_create_twstat(u32 fid, struct p9_wstat *wstat,
+				      int dotu)
 {
 	int size, statsz;
-	struct v9fs_fcall *fc;
+	struct p9_fcall *fc;
 	struct cbuf buffer;
 	struct cbuf *bufp = &buffer;
 
-	statsz = v9fs_size_wstat(wstat, extended);
+	statsz = p9_size_wstat(wstat, dotu);
 	size = 4 + 2 + 2 + statsz;	/* fid[4] stat[n] */
-	fc = v9fs_create_common(bufp, size, TWSTAT);
+	fc = p9_create_common(bufp, size, P9_TWSTAT);
 	if (IS_ERR(fc))
 		goto error;
 
-	v9fs_put_int32(bufp, fid, &fc->params.twstat.fid);
+	p9_put_int32(bufp, fid, &fc->params.twstat.fid);
 	buf_put_int16(bufp, statsz + 2);
-	v9fs_put_wstat(bufp, wstat, &fc->params.twstat.stat, statsz, extended);
+	p9_put_wstat(bufp, wstat, &fc->params.twstat.stat, statsz, dotu);
 
 	if (buf_check_overflow(bufp)) {
 		kfree(fc);
 		fc = ERR_PTR(-ENOMEM);
 	}
-      error:
+error:
 	return fc;
 }
+EXPORT_SYMBOL(p9_create_twstat);

fs/9p/error.h → net/9p/error.c

@@ -1,12 +1,11 @@
 /*
- * linux/fs/9p/error.h
+ * linux/fs/9p/error.c
  *
- * Huge Nasty Error Table
+ * Error string handling
  *
- * Plan 9 uses error strings, Unix uses error numbers.  This table tries to
- * match UNIX strings and Plan 9 strings to unix error numbers.  It is used
- * to preload the dynamic error table which can also track user-specific error
- * strings.
+ * Plan 9 uses error strings, Unix uses error numbers.  These functions
+ * try to help manage that and provide for dynamically adding error
+ * mappings.
  *
  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
@@ -28,8 +27,11 @@
  *
  */
 
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/jhash.h>
 #include <linux/errno.h>
-#include <asm/errno.h>
+#include <net/9p/9p.h>
 
 struct errormap {
 	char *name;
@@ -174,4 +176,65 @@ static struct errormap errmap[] = {
 	{NULL, -1}
 };
 
-extern int v9fs_error_init(void);
+/**
+ * p9_error_init - preload
+ * @errstr: error string
+ *
+ */
+
+int p9_error_init(void)
+{
+	struct errormap *c;
+	int bucket;
+
+	/* initialize hash table */
+	for (bucket = 0; bucket < ERRHASHSZ; bucket++)
+		INIT_HLIST_HEAD(&hash_errmap[bucket]);
+
+	/* load initial error map into hash table */
+	for (c = errmap; c->name != NULL; c++) {
+		c->namelen = strlen(c->name);
+		bucket = jhash(c->name, c->namelen, 0) % ERRHASHSZ;
+		INIT_HLIST_NODE(&c->list);
+		hlist_add_head(&c->list, &hash_errmap[bucket]);
+	}
+
+	return 1;
+}
+EXPORT_SYMBOL(p9_error_init);
+
+/**
+ * errstr2errno - convert error string to error number
+ * @errstr: error string
+ *
+ */
+
+int p9_errstr2errno(char *errstr, int len)
+{
+	int errno;
+	struct hlist_node *p;
+	struct errormap *c;
+	int bucket;
+
+	errno = 0;
+	p = NULL;
+	c = NULL;
+	bucket = jhash(errstr, len, 0) % ERRHASHSZ;
+	hlist_for_each_entry(c, p, &hash_errmap[bucket], list) {
+		if (c->namelen == len && !memcmp(c->name, errstr, len)) {
+			errno = c->val;
+			break;
+		}
+	}
+
+	if (errno == 0) {
+		/* TODO: if error isn't found, add it dynamically */
+		errstr[len] = 0;
+		printk(KERN_ERR "%s: errstr :%s: not found\n", __FUNCTION__,
+		       errstr);
+		errno = 1;
+	}
+
+	return -errno;
+}
+EXPORT_SYMBOL(p9_errstr2errno);

fs/9p/fcprint.c → net/9p/fcprint.c

@@ -1,5 +1,5 @@
 /*
- *  linux/fs/9p/fcprint.c
+ *  net/9p/fcprint.c
  *
  *  Print 9P call.
  *
@@ -25,61 +25,59 @@
 #include <linux/errno.h>
 #include <linux/fs.h>
 #include <linux/idr.h>
+#include <net/9p/9p.h>
 
-#include "debug.h"
-#include "v9fs.h"
-#include "9p.h"
-#include "mux.h"
+#ifdef CONFIG_NET_9P_DEBUG
 
 static int
-v9fs_printqid(char *buf, int buflen, struct v9fs_qid *q)
+p9_printqid(char *buf, int buflen, struct p9_qid *q)
 {
 	int n;
 	char b[10];
 
 	n = 0;
-	if (q->type & V9FS_QTDIR)
+	if (q->type & P9_QTDIR)
 		b[n++] = 'd';
-	if (q->type & V9FS_QTAPPEND)
+	if (q->type & P9_QTAPPEND)
 		b[n++] = 'a';
-	if (q->type & V9FS_QTAUTH)
+	if (q->type & P9_QTAUTH)
 		b[n++] = 'A';
-	if (q->type & V9FS_QTEXCL)
+	if (q->type & P9_QTEXCL)
 		b[n++] = 'l';
-	if (q->type & V9FS_QTTMP)
+	if (q->type & P9_QTTMP)
 		b[n++] = 't';
-	if (q->type & V9FS_QTSYMLINK)
+	if (q->type & P9_QTSYMLINK)
 		b[n++] = 'L';
 	b[n] = '\0';
 
-	return scnprintf(buf, buflen, "(%.16llx %x %s)", (long long int) q->path,
-		q->version, b);
+	return scnprintf(buf, buflen, "(%.16llx %x %s)",
+					(long long int) q->path, q->version, b);
 }
 
 static int
-v9fs_printperm(char *buf, int buflen, int perm)
+p9_printperm(char *buf, int buflen, int perm)
 {
 	int n;
 	char b[15];
 
 	n = 0;
-	if (perm & V9FS_DMDIR)
+	if (perm & P9_DMDIR)
 		b[n++] = 'd';
-	if (perm & V9FS_DMAPPEND)
+	if (perm & P9_DMAPPEND)
 		b[n++] = 'a';
-	if (perm & V9FS_DMAUTH)
+	if (perm & P9_DMAUTH)
 		b[n++] = 'A';
-	if (perm & V9FS_DMEXCL)
+	if (perm & P9_DMEXCL)
 		b[n++] = 'l';
-	if (perm & V9FS_DMTMP)
+	if (perm & P9_DMTMP)
 		b[n++] = 't';
-	if (perm & V9FS_DMDEVICE)
+	if (perm & P9_DMDEVICE)
 		b[n++] = 'D';
-	if (perm & V9FS_DMSOCKET)
+	if (perm & P9_DMSOCKET)
 		b[n++] = 'S';
-	if (perm & V9FS_DMNAMEDPIPE)
+	if (perm & P9_DMNAMEDPIPE)
 		b[n++] = 'P';
-	if (perm & V9FS_DMSYMLINK)
+	if (perm & P9_DMSYMLINK)
 		b[n++] = 'L';
 	b[n] = '\0';
 
@@ -87,7 +85,7 @@ v9fs_printperm(char *buf, int buflen, int perm)
 }
 
 static int
-v9fs_printstat(char *buf, int buflen, struct v9fs_stat *st, int extended)
+p9_printstat(char *buf, int buflen, struct p9_stat *st, int extended)
 {
 	int n;
 
@@ -105,9 +103,9 @@ v9fs_printstat(char *buf, int buflen, struct v9fs_stat *st, int extended)
 		n += scnprintf(buf+n, buflen-n, "(%d)", st->n_muid);
 
 	n += scnprintf(buf+n, buflen-n, " q ");
-	n += v9fs_printqid(buf+n, buflen-n, &st->qid);
+	n += p9_printqid(buf+n, buflen-n, &st->qid);
 	n += scnprintf(buf+n, buflen-n, " m ");
-	n += v9fs_printperm(buf+n, buflen-n, st->mode);
+	n += p9_printperm(buf+n, buflen-n, st->mode);
 	n += scnprintf(buf+n, buflen-n, " at %d mt %d l %lld",
 		st->atime, st->mtime, (long long int) st->length);
 
@@ -119,7 +117,7 @@ v9fs_printstat(char *buf, int buflen, struct v9fs_stat *st, int extended)
 }
 
 static int
-v9fs_dumpdata(char *buf, int buflen, u8 *data, int datalen)
+p9_dumpdata(char *buf, int buflen, u8 *data, int datalen)
 {
 	int i, n;
 
@@ -139,13 +137,13 @@ v9fs_dumpdata(char *buf, int buflen, u8 *data, int datalen)
 }
 
 static int
-v9fs_printdata(char *buf, int buflen, u8 *data, int datalen)
+p9_printdata(char *buf, int buflen, u8 *data, int datalen)
 {
-	return v9fs_dumpdata(buf, buflen, data, datalen<16?datalen:16);
+	return p9_dumpdata(buf, buflen, data, datalen < 16?datalen:16);
 }
 
 int
-v9fs_printfcall(char *buf, int buflen, struct v9fs_fcall *fc, int extended)
+p9_printfcall(char *buf, int buflen, struct p9_fcall *fc, int extended)
 {
 	int i, ret, type, tag;
 
@@ -157,21 +155,23 @@ v9fs_printfcall(char *buf, int buflen, struct v9fs_fcall *fc, int extended)
 
 	ret = 0;
 	switch (type) {
-	case TVERSION:
+	case P9_TVERSION:
 		ret += scnprintf(buf+ret, buflen-ret,
-			"Tversion tag %u msize %u version '%.*s'", tag,
-			fc->params.tversion.msize, fc->params.tversion.version.len,
-			fc->params.tversion.version.str);
+				"Tversion tag %u msize %u version '%.*s'", tag,
+				fc->params.tversion.msize,
+				fc->params.tversion.version.len,
+				fc->params.tversion.version.str);
 		break;
 
-	case RVERSION:
+	case P9_RVERSION:
 		ret += scnprintf(buf+ret, buflen-ret,
-			"Rversion tag %u msize %u version '%.*s'", tag,
-			fc->params.rversion.msize, fc->params.rversion.version.len,
-			fc->params.rversion.version.str);
+				"Rversion tag %u msize %u version '%.*s'", tag,
+				fc->params.rversion.msize,
+				fc->params.rversion.version.len,
+				fc->params.rversion.version.str);
 		break;
 
-	case TAUTH:
+	case P9_TAUTH:
 		ret += scnprintf(buf+ret, buflen-ret,
 			"Tauth tag %u afid %d uname '%.*s' aname '%.*s'", tag,
 			fc->params.tauth.afid, fc->params.tauth.uname.len,
@@ -179,93 +179,97 @@ v9fs_printfcall(char *buf, int buflen, struct v9fs_fcall *fc, int extended)
 			fc->params.tauth.aname.str);
 		break;
 
-	case RAUTH:
+	case P9_RAUTH:
 		ret += scnprintf(buf+ret, buflen-ret, "Rauth tag %u qid ", tag);
-		v9fs_printqid(buf+ret, buflen-ret, &fc->params.rauth.qid);
+		p9_printqid(buf+ret, buflen-ret, &fc->params.rauth.qid);
 		break;
 
-	case TATTACH:
+	case P9_TATTACH:
 		ret += scnprintf(buf+ret, buflen-ret,
-			"Tattach tag %u fid %d afid %d uname '%.*s' aname '%.*s'",
-			tag, fc->params.tattach.fid, fc->params.tattach.afid,
-			fc->params.tattach.uname.len, fc->params.tattach.uname.str,
-			fc->params.tattach.aname.len, fc->params.tattach.aname.str);
+		 "Tattach tag %u fid %d afid %d uname '%.*s' aname '%.*s'", tag,
+		 fc->params.tattach.fid, fc->params.tattach.afid,
+		 fc->params.tattach.uname.len, fc->params.tattach.uname.str,
+		 fc->params.tattach.aname.len, fc->params.tattach.aname.str);
 		break;
 
-	case RATTACH:
-		ret += scnprintf(buf+ret, buflen-ret, "Rattach tag %u qid ", tag);
-		v9fs_printqid(buf+ret, buflen-ret, &fc->params.rattach.qid);
+	case P9_RATTACH:
+		ret += scnprintf(buf+ret, buflen-ret, "Rattach tag %u qid ",
+									tag);
+		p9_printqid(buf+ret, buflen-ret, &fc->params.rattach.qid);
 		break;
 
-	case RERROR:
-		ret += scnprintf(buf+ret, buflen-ret, "Rerror tag %u ename '%.*s'",
-			tag, fc->params.rerror.error.len,
-			fc->params.rerror.error.str);
+	case P9_RERROR:
+		ret += scnprintf(buf+ret, buflen-ret,
+				"Rerror tag %u ename '%.*s'", tag,
+				fc->params.rerror.error.len,
+				fc->params.rerror.error.str);
 		if (extended)
 			ret += scnprintf(buf+ret, buflen-ret, " ecode %d\n",
 				fc->params.rerror.errno);
 		break;
 
-	case TFLUSH:
+	case P9_TFLUSH:
 		ret += scnprintf(buf+ret, buflen-ret, "Tflush tag %u oldtag %u",
 			tag, fc->params.tflush.oldtag);
 		break;
 
-	case RFLUSH:
+	case P9_RFLUSH:
 		ret += scnprintf(buf+ret, buflen-ret, "Rflush tag %u", tag);
 		break;
 
-	case TWALK:
+	case P9_TWALK:
 		ret += scnprintf(buf+ret, buflen-ret,
 			"Twalk tag %u fid %d newfid %d nwname %d", tag,
 			fc->params.twalk.fid, fc->params.twalk.newfid,
 			fc->params.twalk.nwname);
-		for(i = 0; i < fc->params.twalk.nwname; i++)
-			ret += scnprintf(buf+ret, buflen-ret," '%.*s'",
+		for (i = 0; i < fc->params.twalk.nwname; i++)
+			ret += scnprintf(buf+ret, buflen-ret, " '%.*s'",
 				fc->params.twalk.wnames[i].len,
 				fc->params.twalk.wnames[i].str);
 		break;
 
-	case RWALK:
+	case P9_RWALK:
 		ret += scnprintf(buf+ret, buflen-ret, "Rwalk tag %u nwqid %d",
 			tag, fc->params.rwalk.nwqid);
-		for(i = 0; i < fc->params.rwalk.nwqid; i++)
-			ret += v9fs_printqid(buf+ret, buflen-ret,
+		for (i = 0; i < fc->params.rwalk.nwqid; i++)
+			ret += p9_printqid(buf+ret, buflen-ret,
 				&fc->params.rwalk.wqids[i]);
 		break;
 
-	case TOPEN:
+	case P9_TOPEN:
 		ret += scnprintf(buf+ret, buflen-ret,
 			"Topen tag %u fid %d mode %d", tag,
 			fc->params.topen.fid, fc->params.topen.mode);
 		break;
 
-	case ROPEN:
+	case P9_ROPEN:
 		ret += scnprintf(buf+ret, buflen-ret, "Ropen tag %u", tag);
-		ret += v9fs_printqid(buf+ret, buflen-ret, &fc->params.ropen.qid);
-		ret += scnprintf(buf+ret, buflen-ret," iounit %d",
+		ret += p9_printqid(buf+ret, buflen-ret, &fc->params.ropen.qid);
+		ret += scnprintf(buf+ret, buflen-ret, " iounit %d",
 			fc->params.ropen.iounit);
 		break;
 
-	case TCREATE:
+	case P9_TCREATE:
 		ret += scnprintf(buf+ret, buflen-ret,
 			"Tcreate tag %u fid %d name '%.*s' perm ", tag,
 			fc->params.tcreate.fid, fc->params.tcreate.name.len,
 			fc->params.tcreate.name.str);
 
-		ret += v9fs_printperm(buf+ret, buflen-ret, fc->params.tcreate.perm);
+		ret += p9_printperm(buf+ret, buflen-ret,
+						fc->params.tcreate.perm);
 		ret += scnprintf(buf+ret, buflen-ret, " mode %d",
 			fc->params.tcreate.mode);
 		break;
 
-	case RCREATE:
+	case P9_RCREATE:
 		ret += scnprintf(buf+ret, buflen-ret, "Rcreate tag %u", tag);
-		ret += v9fs_printqid(buf+ret, buflen-ret, &fc->params.rcreate.qid);
+		ret += p9_printqid(buf+ret, buflen-ret,
+						&fc->params.rcreate.qid);
 		ret += scnprintf(buf+ret, buflen-ret, " iounit %d",
 			fc->params.rcreate.iounit);
 		break;
 
-	case TREAD:
+	case P9_TREAD:
 		ret += scnprintf(buf+ret, buflen-ret,
 			"Tread tag %u fid %d offset %lld count %u", tag,
 			fc->params.tread.fid,
@@ -273,66 +277,66 @@ v9fs_printfcall(char *buf, int buflen, struct v9fs_fcall *fc, int extended)
 			fc->params.tread.count);
 		break;
 
-	case RREAD:
+	case P9_RREAD:
 		ret += scnprintf(buf+ret, buflen-ret,
 			"Rread tag %u count %u data ", tag,
 			fc->params.rread.count);
-		ret += v9fs_printdata(buf+ret, buflen-ret, fc->params.rread.data,
+		ret += p9_printdata(buf+ret, buflen-ret, fc->params.rread.data,
 			fc->params.rread.count);
 		break;
 
-	case TWRITE:
+	case P9_TWRITE:
 		ret += scnprintf(buf+ret, buflen-ret,
 			"Twrite tag %u fid %d offset %lld count %u data ",
 			tag, fc->params.twrite.fid,
 			(long long int) fc->params.twrite.offset,
 			fc->params.twrite.count);
-		ret += v9fs_printdata(buf+ret, buflen-ret, fc->params.twrite.data,
+		ret += p9_printdata(buf+ret, buflen-ret, fc->params.twrite.data,
 			fc->params.twrite.count);
 		break;
 
-	case RWRITE:
+	case P9_RWRITE:
 		ret += scnprintf(buf+ret, buflen-ret, "Rwrite tag %u count %u",
 			tag, fc->params.rwrite.count);
 		break;
 
-	case TCLUNK:
+	case P9_TCLUNK:
 		ret += scnprintf(buf+ret, buflen-ret, "Tclunk tag %u fid %d",
 			tag, fc->params.tclunk.fid);
 		break;
 
-	case RCLUNK:
+	case P9_RCLUNK:
 		ret += scnprintf(buf+ret, buflen-ret, "Rclunk tag %u", tag);
 		break;
 
-	case TREMOVE:
+	case P9_TREMOVE:
 		ret += scnprintf(buf+ret, buflen-ret, "Tremove tag %u fid %d",
 			tag, fc->params.tremove.fid);
 		break;
 
-	case RREMOVE:
+	case P9_RREMOVE:
 		ret += scnprintf(buf+ret, buflen-ret, "Rremove tag %u", tag);
 		break;
 
-	case TSTAT:
+	case P9_TSTAT:
 		ret += scnprintf(buf+ret, buflen-ret, "Tstat tag %u fid %d",
 			tag, fc->params.tstat.fid);
 		break;
 
-	case RSTAT:
+	case P9_RSTAT:
 		ret += scnprintf(buf+ret, buflen-ret, "Rstat tag %u ", tag);
-		ret += v9fs_printstat(buf+ret, buflen-ret, &fc->params.rstat.stat,
+		ret += p9_printstat(buf+ret, buflen-ret, &fc->params.rstat.stat,
 			extended);
 		break;
 
-	case TWSTAT:
+	case P9_TWSTAT:
 		ret += scnprintf(buf+ret, buflen-ret, "Twstat tag %u fid %d ",
 			tag, fc->params.twstat.fid);
-		ret += v9fs_printstat(buf+ret, buflen-ret, &fc->params.twstat.stat,
-			extended);
+		ret += p9_printstat(buf+ret, buflen-ret,
+					&fc->params.twstat.stat, extended);
 		break;
 
-	case RWSTAT:
+	case P9_RWSTAT:
 		ret += scnprintf(buf+ret, buflen-ret, "Rwstat tag %u", tag);
 		break;
 
@@ -343,3 +347,12 @@ v9fs_printfcall(char *buf, int buflen, struct v9fs_fcall *fc, int extended)
 
 	return ret;
 }
+
+#else
+int
+p9_printfcall(char *buf, int buflen, struct p9_fcall *fc, int extended)
+{
+	return 0;
+}
+EXPORT_SYMBOL(p9_printfcall);
+#endif /* CONFIG_NET_9P_DEBUG */

net/9p/mod.c

@@ -0,0 +1,85 @@
+/*
+ *  net/9p/9p.c
+ *
+ *  9P entry point
+ *
+ *  Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
+ *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
+ *
+ *  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/moduleparam.h>
+#include <net/9p/9p.h>
+
+#ifdef CONFIG_NET_9P_DEBUG
+unsigned int p9_debug_level = 0;	/* feature-rific global debug level  */
+EXPORT_SYMBOL(p9_debug_level);
+module_param_named(debug, p9_debug_level, uint, 0);
+MODULE_PARM_DESC(debug, "9P debugging level");
+#endif
+
+extern int p9_mux_global_init(void);
+extern void p9_mux_global_exit(void);
+extern int p9_sysctl_register(void);
+extern void p9_sysctl_unregister(void);
+
+/**
+ * v9fs_init - Initialize module
+ *
+ */
+static int __init init_p9(void)
+{
+	int ret;
+
+	p9_error_init();
+	printk(KERN_INFO "Installing 9P2000 support\n");
+	ret = p9_mux_global_init();
+	if (ret) {
+		printk(KERN_WARNING "9p: starting mux failed\n");
+		return ret;
+	}
+
+	ret = p9_sysctl_register();
+	if (ret) {
+		printk(KERN_WARNING "9p: registering sysctl failed\n");
+		return ret;
+	}
+
+	return ret;
+}
+
+/**
+ * v9fs_init - shutdown module
+ *
+ */
+
+static void __exit exit_p9(void)
+{
+	p9_sysctl_unregister();
+	p9_mux_global_exit();
+}
+
+module_init(init_p9)
+module_exit(exit_p9)
+
+MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
+MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
+MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
+MODULE_LICENSE("GPL");

net/9p/sysctl.c

@@ -0,0 +1,86 @@
+/*
+ *  net/9p/sysctl.c
+ *
+ *  9P sysctl interface
+ *
+ *  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/kernel.h>
+#include <linux/mm.h>
+#include <linux/sysctl.h>
+#include <linux/init.h>
+#include <net/9p/9p.h>
+
+enum {
+	P9_SYSCTL_NET = 487,
+	P9_SYSCTL_DEBUG = 1,
+};
+
+static ctl_table p9_table[] = {
+#ifdef CONFIG_NET_9P_DEBUG
+	{
+		.ctl_name       = P9_SYSCTL_DEBUG,
+		.procname       = "debug",
+		.data           = &p9_debug_level,
+		.maxlen         = sizeof(int),
+		.mode           = 0644,
+		.proc_handler   = &proc_dointvec
+	},
+#endif
+	{	.ctl_name	= 0 },
+};
+
+static ctl_table p9_net_table[] = {
+	{
+		.ctl_name	= P9_SYSCTL_NET,
+		.procname	= "9p",
+		.maxlen		= 0,
+		.mode		= 0555,
+		.child		= p9_table,
+	},
+	{	.ctl_name	= 0 },
+};
+
+static ctl_table p9_ctl_table[] = {
+	{
+		.ctl_name	= CTL_NET,
+		.procname	= "net",
+		.maxlen		= 0,
+		.mode		= 0555,
+		.child		= p9_net_table,
+	},
+	{	.ctl_name	= 0 },
+};
+
+static struct ctl_table_header *p9_table_header;
+
+int __init p9_sysctl_register(void)
+{
+	p9_table_header = register_sysctl_table(p9_ctl_table);
+	if (!p9_table_header)
+		return -ENOMEM;
+
+	return 0;
+}
+
+void __exit p9_sysctl_unregister(void)
+{
+	 unregister_sysctl_table(p9_table_header);
+}

net/9p/trans_fd.c

@@ -0,0 +1,363 @@
+/*
+ * linux/fs/9p/trans_fd.c
+ *
+ * Fd transport layer.  Includes deprecated socket layer.
+ *
+ *  Copyright (C) 2006 by Russ Cox <rsc@swtch.com>
+ *  Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
+ *  Copyright (C) 2004-2005 by Eric Van Hensbergen <ericvh@gmail.com>
+ *  Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
+ *
+ *  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/in.h>
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/ipv6.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/un.h>
+#include <linux/uaccess.h>
+#include <linux/inet.h>
+#include <linux/idr.h>
+#include <linux/file.h>
+#include <net/9p/9p.h>
+#include <net/9p/transport.h>
+
+#define P9_PORT 564
+
+struct p9_trans_fd {
+	struct file *rd;
+	struct file *wr;
+};
+
+static int p9_socket_open(struct p9_transport *trans, struct socket *csocket);
+static int p9_fd_open(struct p9_transport *trans, int rfd, int wfd);
+static int p9_fd_read(struct p9_transport *trans, void *v, int len);
+static int p9_fd_write(struct p9_transport *trans, void *v, int len);
+static unsigned int p9_fd_poll(struct p9_transport *trans,
+						struct poll_table_struct *pt);
+static void p9_fd_close(struct p9_transport *trans);
+
+struct p9_transport *p9_trans_create_tcp(const char *addr, int port)
+{
+	int err;
+	struct p9_transport *trans;
+	struct socket *csocket;
+	struct sockaddr_in sin_server;
+
+	csocket = NULL;
+	trans = kmalloc(sizeof(struct p9_transport), GFP_KERNEL);
+	if (!trans)
+		return ERR_PTR(-ENOMEM);
+
+	trans->write = p9_fd_write;
+	trans->read = p9_fd_read;
+	trans->close = p9_fd_close;
+	trans->poll = p9_fd_poll;
+
+	sin_server.sin_family = AF_INET;
+	sin_server.sin_addr.s_addr = in_aton(addr);
+	sin_server.sin_port = htons(port);
+	sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
+
+	if (!csocket) {
+		P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
+		err = -EIO;
+		goto error;
+	}
+
+	err = csocket->ops->connect(csocket,
+				    (struct sockaddr *)&sin_server,
+				    sizeof(struct sockaddr_in), 0);
+	if (err < 0) {
+		P9_EPRINTK(KERN_ERR,
+			"p9_trans_tcp: problem connecting socket to %s\n",
+			addr);
+		goto error;
+	}
+
+	err = p9_socket_open(trans, csocket);
+	if (err < 0)
+		goto error;
+
+	return trans;
+
+error:
+	if (csocket)
+		sock_release(csocket);
+
+	kfree(trans);
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL(p9_trans_create_tcp);
+
+struct p9_transport *p9_trans_create_unix(const char *addr)
+{
+	int err;
+	struct socket *csocket;
+	struct sockaddr_un sun_server;
+	struct p9_transport *trans;
+
+	csocket = NULL;
+	trans = kmalloc(sizeof(struct p9_transport), GFP_KERNEL);
+	if (!trans)
+		return ERR_PTR(-ENOMEM);
+
+	trans->write = p9_fd_write;
+	trans->read = p9_fd_read;
+	trans->close = p9_fd_close;
+	trans->poll = p9_fd_poll;
+
+	if (strlen(addr) > UNIX_PATH_MAX) {
+		P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
+			addr);
+		err = -ENAMETOOLONG;
+		goto error;
+	}
+
+	sun_server.sun_family = PF_UNIX;
+	strcpy(sun_server.sun_path, addr);
+	sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
+	err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
+			sizeof(struct sockaddr_un) - 1, 0);
+	if (err < 0) {
+		P9_EPRINTK(KERN_ERR,
+			"p9_trans_unix: problem connecting socket: %s: %d\n",
+			addr, err);
+		goto error;
+	}
+
+	err = p9_socket_open(trans, csocket);
+	if (err < 0)
+		goto error;
+
+	return trans;
+
+error:
+	if (csocket)
+		sock_release(csocket);
+
+	kfree(trans);
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL(p9_trans_create_unix);
+
+struct p9_transport *p9_trans_create_fd(int rfd, int wfd)
+{
+	int err;
+	struct p9_transport *trans;
+
+	if (rfd == ~0 || wfd == ~0) {
+		printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
+		return ERR_PTR(-ENOPROTOOPT);
+	}
+
+	trans = kmalloc(sizeof(struct p9_transport), GFP_KERNEL);
+	if (!trans)
+		return ERR_PTR(-ENOMEM);
+
+	trans->write = p9_fd_write;
+	trans->read = p9_fd_read;
+	trans->close = p9_fd_close;
+	trans->poll = p9_fd_poll;
+
+	err = p9_fd_open(trans, rfd, wfd);
+	if (err < 0)
+		goto error;
+
+	return trans;
+
+error:
+	kfree(trans);
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL(p9_trans_create_fd);
+
+static int p9_socket_open(struct p9_transport *trans, struct socket *csocket)
+{
+	int fd, ret;
+
+	csocket->sk->sk_allocation = GFP_NOIO;
+	fd = sock_map_fd(csocket);
+	if (fd < 0) {
+		P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
+		return fd;
+	}
+
+	ret = p9_fd_open(trans, fd, fd);
+	if (ret < 0) {
+		P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n");
+		sockfd_put(csocket);
+		return ret;
+	}
+
+	((struct p9_trans_fd *)trans->priv)->rd->f_flags |= O_NONBLOCK;
+
+	return 0;
+}
+
+static int p9_fd_open(struct p9_transport *trans, int rfd, int wfd)
+{
+	struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
+					   GFP_KERNEL);
+	if (!ts)
+		return -ENOMEM;
+
+	ts->rd = fget(rfd);
+	ts->wr = fget(wfd);
+	if (!ts->rd || !ts->wr) {
+		if (ts->rd)
+			fput(ts->rd);
+		if (ts->wr)
+			fput(ts->wr);
+		kfree(ts);
+		return -EIO;
+	}
+
+	trans->priv = ts;
+	trans->status = Connected;
+
+	return 0;
+}
+
+/**
+ * p9_fd_read- read from a fd
+ * @v9ses: session information
+ * @v: buffer to receive data into
+ * @len: size of receive buffer
+ *
+ */
+static int p9_fd_read(struct p9_transport *trans, void *v, int len)
+{
+	int ret;
+	struct p9_trans_fd *ts = NULL;
+
+	if (trans && trans->status != Disconnected)
+		ts = trans->priv;
+
+	if (!ts)
+		return -EREMOTEIO;
+
+	if (!(ts->rd->f_flags & O_NONBLOCK))
+		P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
+
+	ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
+	if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
+		trans->status = Disconnected;
+	return ret;
+}
+
+/**
+ * p9_fd_write - write to a socket
+ * @v9ses: session information
+ * @v: buffer to send data from
+ * @len: size of send buffer
+ *
+ */
+static int p9_fd_write(struct p9_transport *trans, void *v, int len)
+{
+	int ret;
+	mm_segment_t oldfs;
+	struct p9_trans_fd *ts = NULL;
+
+	if (trans && trans->status != Disconnected)
+		ts = trans->priv;
+
+	if (!ts)
+		return -EREMOTEIO;
+
+	if (!(ts->wr->f_flags & O_NONBLOCK))
+		P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
+
+	oldfs = get_fs();
+	set_fs(get_ds());
+	/* The cast to a user pointer is valid due to the set_fs() */
+	ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
+	set_fs(oldfs);
+
+	if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
+		trans->status = Disconnected;
+	return ret;
+}
+
+static unsigned int
+p9_fd_poll(struct p9_transport *trans, struct poll_table_struct *pt)
+{
+	int ret, n;
+	struct p9_trans_fd *ts = NULL;
+	mm_segment_t oldfs;
+
+	if (trans && trans->status == Connected)
+		ts = trans->priv;
+
+	if (!ts)
+		return -EREMOTEIO;
+
+	if (!ts->rd->f_op || !ts->rd->f_op->poll)
+		return -EIO;
+
+	if (!ts->wr->f_op || !ts->wr->f_op->poll)
+		return -EIO;
+
+	oldfs = get_fs();
+	set_fs(get_ds());
+
+	ret = ts->rd->f_op->poll(ts->rd, pt);
+	if (ret < 0)
+		goto end;
+
+	if (ts->rd != ts->wr) {
+		n = ts->wr->f_op->poll(ts->wr, pt);
+		if (n < 0) {
+			ret = n;
+			goto end;
+		}
+		ret = (ret & ~POLLOUT) | (n & ~POLLIN);
+	}
+
+end:
+	set_fs(oldfs);
+	return ret;
+}
+
+/**
+ * p9_sock_close - shutdown socket
+ * @trans: private socket structure
+ *
+ */
+static void p9_fd_close(struct p9_transport *trans)
+{
+	struct p9_trans_fd *ts;
+
+	if (!trans)
+		return;
+
+	ts = xchg(&trans->priv, NULL);
+
+	if (!ts)
+		return;
+
+	trans->status = Disconnected;
+	if (ts->rd)
+		fput(ts->rd);
+	if (ts->wr)
+		fput(ts->wr);
+	kfree(ts);
+}
+

net/9p/util.c

@@ -0,0 +1,125 @@
+/*
+ *  net/9p/util.c
+ *
+ *  This file contains some helper functions
+ *
+ *  Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
+ *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
+ *
+ *  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/sched.h>
+#include <linux/parser.h>
+#include <linux/idr.h>
+#include <net/9p/9p.h>
+
+struct p9_idpool {
+	struct semaphore lock;
+	struct idr pool;
+};
+
+struct p9_idpool *p9_idpool_create(void)
+{
+	struct p9_idpool *p;
+
+	p = kmalloc(sizeof(struct p9_idpool), GFP_KERNEL);
+	if (!p)
+		return ERR_PTR(-ENOMEM);
+
+	init_MUTEX(&p->lock);
+	idr_init(&p->pool);
+
+	return p;
+}
+EXPORT_SYMBOL(p9_idpool_create);
+
+void p9_idpool_destroy(struct p9_idpool *p)
+{
+	idr_destroy(&p->pool);
+	kfree(p);
+}
+EXPORT_SYMBOL(p9_idpool_destroy);
+
+/**
+ * p9_idpool_get - allocate numeric id from pool
+ * @p - pool to allocate from
+ *
+ * XXX - This seems to be an awful generic function, should it be in idr.c with
+ *            the lock included in struct idr?
+ */
+
+int p9_idpool_get(struct p9_idpool *p)
+{
+	int i = 0;
+	int error;
+
+retry:
+	if (idr_pre_get(&p->pool, GFP_KERNEL) == 0)
+		return 0;
+
+	if (down_interruptible(&p->lock) == -EINTR) {
+		P9_EPRINTK(KERN_WARNING, "Interrupted while locking\n");
+		return -1;
+	}
+
+	/* no need to store exactly p, we just need something non-null */
+	error = idr_get_new(&p->pool, p, &i);
+	up(&p->lock);
+
+	if (error == -EAGAIN)
+		goto retry;
+	else if (error)
+		return -1;
+
+	return i;
+}
+EXPORT_SYMBOL(p9_idpool_get);
+
+/**
+ * p9_idpool_put - release numeric id from pool
+ * @p - pool to allocate from
+ *
+ * XXX - This seems to be an awful generic function, should it be in idr.c with
+ *            the lock included in struct idr?
+ */
+
+void p9_idpool_put(int id, struct p9_idpool *p)
+{
+	if (down_interruptible(&p->lock) == -EINTR) {
+		P9_EPRINTK(KERN_WARNING, "Interrupted while locking\n");
+		return;
+	}
+	idr_remove(&p->pool, id);
+	up(&p->lock);
+}
+EXPORT_SYMBOL(p9_idpool_put);
+
+/**
+ * p9_idpool_check - check if the specified id is available
+ * @id - id to check
+ * @p - pool
+ */
+int p9_idpool_check(int id, struct p9_idpool *p)
+{
+	return idr_find(&p->pool, id) != NULL;
+}
+EXPORT_SYMBOL(p9_idpool_check);

net/Kconfig

@@ -227,6 +227,7 @@ source "net/ieee80211/Kconfig"
 endmenu
 
 source "net/rfkill/Kconfig"
+source "net/9p/Kconfig"
 
 endif   # if NET
 endmenu # Networking

net/Makefile

@@ -51,6 +51,7 @@ obj-$(CONFIG_TIPC)		+= tipc/
 obj-$(CONFIG_NETLABEL)		+= netlabel/
 obj-$(CONFIG_IUCV)		+= iucv/
 obj-$(CONFIG_RFKILL)		+= rfkill/
+obj-$(CONFIG_NET_9P)		+= 9p/
 
 ifeq ($(CONFIG_NET),y)
 obj-$(CONFIG_SYSCTL)		+= sysctl_net.o