Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
  9p: fix p9_printfcall export
  9p: transport API reorganization
  9p: add remove function to trans_virtio
  9p: Convert semaphore to spinlock for p9_idpool
  9p: fix mmap to be read-only
  9p: add support for sticky bit
  9p: Fix soft lockup in virtio transport
  9p: fix bug in attach-per-user
  9p: block-based virtio client
  9p: create transport rpc cut-thru
  9p: fix bug in p9_clone_stat

fs/9p/fid.c

@@ -175,7 +175,7 @@ struct p9_fid *v9fs_fid_lookup(struct dentry *dentry)
 	if (!wnames)
 		return ERR_PTR(-ENOMEM);
 
-	for (d = dentry, i = n; i >= 0; i--, d = d->d_parent)
+	for (d = dentry, i = (n-1); i >= 0; i--, d = d->d_parent)
 		wnames[i] = (char *) d->d_name.name;
 
 	clone = 1;
@@ -183,7 +183,7 @@ struct p9_fid *v9fs_fid_lookup(struct dentry *dentry)
 	while (i < n) {
 		l = min(n - i, P9_MAXWELEM);
 		fid = p9_client_walk(fid, l, &wnames[i], clone);
-		if (!fid) {
+		if (IS_ERR(fid)) {
 			kfree(wnames);
 			return fid;
 		}

fs/9p/v9fs.c

@@ -3,7 +3,7 @@
  *
  *  This file contains functions assisting in mapping VFS to 9P2000
  *
- *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ *  Copyright (C) 2004-2008 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
@@ -31,7 +31,6 @@
 #include <linux/idr.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 "v9fs_vfs.h"
@@ -43,11 +42,11 @@
 
 enum {
 	/* Options that take integer arguments */
-	Opt_debug, Opt_msize, Opt_dfltuid, Opt_dfltgid, Opt_afid,
+	Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
 	/* String options */
 	Opt_uname, Opt_remotename, Opt_trans,
 	/* Options that take no arguments */
-	Opt_legacy, Opt_nodevmap,
+	Opt_nodevmap,
 	/* Cache options */
 	Opt_cache_loose,
 	/* Access options */
@@ -58,14 +57,11 @@ enum {
 
 static match_table_t tokens = {
 	{Opt_debug, "debug=%x"},
-	{Opt_msize, "msize=%u"},
 	{Opt_dfltuid, "dfltuid=%u"},
 	{Opt_dfltgid, "dfltgid=%u"},
 	{Opt_afid, "afid=%u"},
 	{Opt_uname, "uname=%s"},
 	{Opt_remotename, "aname=%s"},
-	{Opt_trans, "trans=%s"},
-	{Opt_legacy, "noextend"},
 	{Opt_nodevmap, "nodevmap"},
 	{Opt_cache_loose, "cache=loose"},
 	{Opt_cache_loose, "loose"},
@@ -85,16 +81,14 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
 	char *options;
 	substring_t args[MAX_OPT_ARGS];
 	char *p;
-	int option;
-	int ret;
+	int option = 0;
 	char *s, *e;
+	int ret;
 
 	/* setup defaults */
-	v9ses->maxdata = 8192;
 	v9ses->afid = ~0;
 	v9ses->debug = 0;
 	v9ses->cache = 0;
-	v9ses->trans = v9fs_default_trans();
 
 	if (!v9ses->options)
 		return;
@@ -106,7 +100,8 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
 			continue;
 		token = match_token(p, tokens, args);
 		if (token < Opt_uname) {
-			if ((ret = match_int(&args[0], &option)) < 0) {
+			ret = match_int(&args[0], &option);
+			if (ret < 0) {
 				P9_DPRINTK(P9_DEBUG_ERROR,
 					"integer field, but no integer?\n");
 				continue;
@@ -119,9 +114,7 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
 			p9_debug_level = option;
 #endif
 			break;
-		case Opt_msize:
-			v9ses->maxdata = option;
-			break;
+
 		case Opt_dfltuid:
 			v9ses->dfltuid = option;
 			break;
@@ -131,18 +124,12 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses)
 		case Opt_afid:
 			v9ses->afid = option;
 			break;
-		case Opt_trans:
-			v9ses->trans = v9fs_match_trans(&args[0]);
-			break;
 		case Opt_uname:
 			match_strcpy(v9ses->uname, &args[0]);
 			break;
 		case Opt_remotename:
 			match_strcpy(v9ses->aname, &args[0]);
 			break;
-		case Opt_legacy:
-			v9ses->flags &= ~V9FS_EXTENDED;
-			break;
 		case Opt_nodevmap:
 			v9ses->nodev = 1;
 			break;
@@ -185,7 +172,6 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
 		  const char *dev_name, char *data)
 {
 	int retval = -EINVAL;
-	struct p9_trans *trans = NULL;
 	struct p9_fid *fid;
 
 	v9ses->uname = __getname();
@@ -207,24 +193,7 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
 	v9ses->options = kstrdup(data, GFP_KERNEL);
 	v9fs_parse_options(v9ses);
 
-	if (v9ses->trans == NULL) {
-		retval = -EPROTONOSUPPORT;
-		P9_DPRINTK(P9_DEBUG_ERROR,
-				"No transport defined or default transport\n");
-		goto error;
-	}
-
-	trans = v9ses->trans->create(dev_name, v9ses->options);
-	if (IS_ERR(trans)) {
-		retval = PTR_ERR(trans);
-		trans = NULL;
-		goto error;
-	}
-	if ((v9ses->maxdata+P9_IOHDRSZ) > v9ses->trans->maxsize)
-		v9ses->maxdata = v9ses->trans->maxsize-P9_IOHDRSZ;
-
-	v9ses->clnt = p9_client_create(trans, v9ses->maxdata+P9_IOHDRSZ,
-		v9fs_extended(v9ses));
+	v9ses->clnt = p9_client_create(dev_name, v9ses->options);
 
 	if (IS_ERR(v9ses->clnt)) {
 		retval = PTR_ERR(v9ses->clnt);
@@ -236,6 +205,8 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
 	if (!v9ses->clnt->dotu)
 		v9ses->flags &= ~V9FS_EXTENDED;
 
+	v9ses->maxdata = v9ses->clnt->msize;
+
 	/* for legacy mode, fall back to V9FS_ACCESS_ANY */
 	if (!v9fs_extended(v9ses) &&
 		((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {

fs/9p/v9fs.h

 /*
  * V9FS definitions.
  *
- *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ *  Copyright (C) 2004-2008 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
@@ -28,7 +28,6 @@
 
 struct v9fs_session_info {
 	/* options */
-	unsigned int maxdata;
 	unsigned char flags;	/* session flags */
 	unsigned char nodev;	/* set to 1 if no disable device mapping */
 	unsigned short debug;	/* debug level */
@@ -38,10 +37,10 @@ struct v9fs_session_info {
 	char *options;		/* copy of mount options */
 	char *uname;		/* user name to mount as */
 	char *aname;		/* name of remote hierarchy being mounted */
+	unsigned int maxdata;	/* max data for client interface */
 	unsigned int dfltuid;	/* default uid/muid for legacy support */
 	unsigned int dfltgid;	/* default gid for legacy support */
 	u32 uid;		/* if ACCESS_SINGLE, the uid that has access */
-	struct p9_trans_module *trans; /* 9p transport */
 	struct p9_client *clnt;	/* 9p client */
 	struct dentry *debugfs_dir;
 };

fs/9p/vfs_file.c

@@ -184,7 +184,7 @@ static const struct file_operations v9fs_cached_file_operations = {
 	.open = v9fs_file_open,
 	.release = v9fs_dir_release,
 	.lock = v9fs_file_lock,
-	.mmap = generic_file_mmap,
+	.mmap = generic_file_readonly_mmap,
 };
 
 const struct file_operations v9fs_file_operations = {
@@ -194,5 +194,5 @@ const struct file_operations v9fs_file_operations = {
 	.open = v9fs_file_open,
 	.release = v9fs_dir_release,
 	.lock = v9fs_file_lock,
-	.mmap = generic_file_mmap,
+	.mmap = generic_file_readonly_mmap,
 };

fs/9p/vfs_inode.c

@@ -77,6 +77,8 @@ static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
 			res |= P9_DMSETUID;
 		if ((mode & S_ISGID) == S_ISGID)
 			res |= P9_DMSETGID;
+		if ((mode & S_ISVTX) == S_ISVTX)
+			res |= P9_DMSETVTX;
 		if ((mode & P9_DMLINK))
 			res |= P9_DMLINK;
 	}
@@ -119,6 +121,9 @@ static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
 
 		if ((mode & P9_DMSETGID) == P9_DMSETGID)
 			res |= S_ISGID;
+
+		if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
+			res |= S_ISVTX;
 	}
 
 	return res;

include/net/9p/9p.h

@@ -124,6 +124,7 @@ enum {
 	P9_DMSOCKET = 0x00100000,
 	P9_DMSETUID = 0x00080000,
 	P9_DMSETGID = 0x00040000,
+	P9_DMSETVTX = 0x00010000,
 };
 
 /* qid.types */

include/net/9p/client.h

@@ -3,6 +3,7 @@
  *
  * 9P Client Definitions
  *
+ *  Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
  *  Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
  *
  *  This program is free software; you can redistribute it and/or modify
@@ -29,6 +30,7 @@ struct p9_client {
 	spinlock_t lock; /* protect client structure */
 	int msize;
 	unsigned char dotu;
+	struct p9_trans_module *trans_mod;
 	struct p9_trans *trans;
 	struct p9_conn *conn;
 
@@ -52,8 +54,7 @@ struct p9_fid {
 	struct list_head dlist;	/* list of all fids attached to a dentry */
 };
 
-struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
-								int dotu);
+struct p9_client *p9_client_create(const char *dev_name, char *options);
 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,

include/net/9p/conn.h

-/*
- * include/net/9p/conn.h
- *
- * Connection Definitions
- *
- *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
- *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.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
- *
- */
-
-#ifndef NET_9P_CONN_H
-#define NET_9P_CONN_H
-
-#undef P9_NONBLOCK
-
-struct p9_conn;
-struct p9_req;
-
-/**
- * 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
- */
-typedef void (*p9_conn_req_callback)(struct p9_req *req, void *a);
-
-struct p9_conn *p9_conn_create(struct p9_trans *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);
-
-#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 */
-
-void p9_conn_cancel(struct p9_conn *m, int err);
-
-#endif /* NET_9P_CONN_H */

include/net/9p/transport.h

@@ -4,7 +4,7 @@
  * Transport Definition
  *
  *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
- *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ *  Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.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
@@ -34,11 +34,12 @@ enum p9_trans_status {
 
 struct p9_trans {
 	enum p9_trans_status status;
+	int msize;
+	unsigned char extended;
 	void *priv;
-	int (*write) (struct p9_trans *, void *, int);
-	int (*read) (struct p9_trans *, void *, int);
 	void (*close) (struct p9_trans *);
-	unsigned int (*poll)(struct p9_trans *, struct poll_table_struct *);
+	int (*rpc) (struct p9_trans *t, struct p9_fcall *tc,
+							struct p9_fcall **rc);
 };
 
 struct p9_trans_module {
@@ -46,7 +47,7 @@ struct p9_trans_module {
 	char *name;		/* name of transport */
 	int maxsize;		/* max message size of transport */
 	int def;		/* this transport should be default */
-	struct p9_trans * (*create)(const char *devname, char *options);
+	struct p9_trans * (*create)(const char *, char *, int, unsigned char);
 };
 
 void v9fs_register_trans(struct p9_trans_module *m);

net/9p/Makefile

@@ -4,7 +4,6 @@ obj-$(CONFIG_NET_9P_VIRTIO) += 9pnet_virtio.o
 
 9pnet-objs := \
 	mod.o \
-	mux.o \
 	client.o \
 	conv.o \
 	error.o \

net/9p/client.c

@@ -3,6 +3,7 @@
  *
  * 9P Client
  *
+ *  Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
  *  Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
  *
  *  This program is free software; you can redistribute it and/or modify
@@ -25,6 +26,7 @@
 #include <linux/module.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
+#include <linux/poll.h>
 #include <linux/idr.h>
 #include <linux/mutex.h>
 #include <linux/sched.h>
@@ -32,15 +34,97 @@
 #include <net/9p/9p.h>
 #include <linux/parser.h>
 #include <net/9p/transport.h>
-#include <net/9p/conn.h>
 #include <net/9p/client.h>
 
 static struct p9_fid *p9_fid_create(struct p9_client *clnt);
 static void p9_fid_destroy(struct p9_fid *fid);
 static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu);
 
-struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
-								   int dotu)
+/*
+  * Client Option Parsing (code inspired by NFS code)
+  *  - a little lazy - parse all client options
+  */
+
+enum {
+	Opt_msize,
+	Opt_trans,
+	Opt_legacy,
+	Opt_err,
+};
+
+static match_table_t tokens = {
+	{Opt_msize, "msize=%u"},
+	{Opt_legacy, "noextend"},
+	{Opt_trans, "trans=%s"},
+	{Opt_err, NULL},
+};
+
+/**
+ * v9fs_parse_options - parse mount options into session structure
+ * @options: options string passed from mount
+ * @v9ses: existing v9fs session information
+ *
+ */
+
+static void parse_opts(char *options, struct p9_client *clnt)
+{
+	char *p;
+	substring_t args[MAX_OPT_ARGS];
+	int option;
+	int ret;
+
+	clnt->trans_mod = v9fs_default_trans();
+	clnt->dotu = 1;
+	clnt->msize = 8192;
+
+	if (!options)
+		return;
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		int token;
+		if (!*p)
+			continue;
+		token = match_token(p, tokens, args);
+		if (token < Opt_trans) {
+			ret = match_int(&args[0], &option);
+			if (ret < 0) {
+				P9_DPRINTK(P9_DEBUG_ERROR,
+					"integer field, but no integer?\n");
+				continue;
+			}
+		}
+		switch (token) {
+		case Opt_msize:
+			clnt->msize = option;
+			break;
+		case Opt_trans:
+			clnt->trans_mod = v9fs_match_trans(&args[0]);
+			break;
+		case Opt_legacy:
+			clnt->dotu = 0;
+			break;
+		default:
+			continue;
+		}
+	}
+}
+
+
+/**
+ * p9_client_rpc - sends 9P request and waits until a response is available.
+ *      The function can be interrupted.
+ * @c: client data
+ * @tc: request to be sent
+ * @rc: pointer where a pointer to the response is stored
+ */
+int
+p9_client_rpc(struct p9_client *c, struct p9_fcall *tc,
+	struct p9_fcall **rc)
+{
+	return c->trans->rpc(c->trans, tc, rc);
+}
+
+struct p9_client *p9_client_create(const char *dev_name, char *options)
 {
 	int err, n;
 	struct p9_client *clnt;
@@ -54,12 +138,7 @@ struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
 	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) {
@@ -68,13 +147,29 @@ struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
 		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;
+	parse_opts(options, clnt);
+	if (clnt->trans_mod == NULL) {
+		err = -EPROTONOSUPPORT;
+		P9_DPRINTK(P9_DEBUG_ERROR,
+				"No transport defined or default transport\n");
 		goto error;
 	}
 
+	P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n",
+		clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
+
+
+	clnt->trans = clnt->trans_mod->create(dev_name, options, clnt->msize,
+								clnt->dotu);
+	if (IS_ERR(clnt->trans)) {
+		err = PTR_ERR(clnt->trans);
+		clnt->trans = NULL;
+		goto error;
+	}
+
+	if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
+		clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
+
 	tc = p9_create_tversion(clnt->msize, clnt->dotu?"9P2000.u":"9P2000");
 	if (IS_ERR(tc)) {
 		err = PTR_ERR(tc);
@@ -82,7 +177,7 @@ struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
 		goto error;
 	}
 
-	err = p9_conn_rpc(clnt->conn, tc, &rc);
+	err = p9_client_rpc(clnt, tc, &rc);
 	if (err)
 		goto error;
 
@@ -117,10 +212,6 @@ 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);
@@ -142,7 +233,6 @@ 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);
 
@@ -174,7 +264,7 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
 		goto error;
 	}
 
-	err = p9_conn_rpc(clnt->conn, tc, &rc);
+	err = p9_client_rpc(clnt, tc, &rc);
 	if (err)
 		goto error;
 
@@ -219,7 +309,7 @@ struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname,
 		goto error;
 	}
 
-	err = p9_conn_rpc(clnt->conn, tc, &rc);
+	err = p9_client_rpc(clnt, tc, &rc);
 	if (err)
 		goto error;
 
@@ -270,7 +360,7 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
 		goto error;
 	}
 
-	err = p9_conn_rpc(clnt->conn, tc, &rc);
+	err = p9_client_rpc(clnt, tc, &rc);
 	if (err) {
 		if (rc && rc->id == P9_RWALK)
 			goto clunk_fid;
@@ -305,7 +395,7 @@ clunk_fid:
 		goto error;
 	}
 
-	p9_conn_rpc(clnt->conn, tc, &rc);
+	p9_client_rpc(clnt, tc, &rc);
 
 error:
 	kfree(tc);
@@ -339,7 +429,7 @@ int p9_client_open(struct p9_fid *fid, int mode)
 		goto done;
 	}
 
-	err = p9_conn_rpc(clnt->conn, tc, &rc);
+	err = p9_client_rpc(clnt, tc, &rc);
 	if (err)
 		goto done;
 
@@ -378,7 +468,7 @@ int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
 		goto done;
 	}
 
-	err = p9_conn_rpc(clnt->conn, tc, &rc);
+	err = p9_client_rpc(clnt, tc, &rc);
 	if (err)
 		goto done;
 
@@ -411,7 +501,7 @@ int p9_client_clunk(struct p9_fid *fid)
 		goto done;
 	}
 
-	err = p9_conn_rpc(clnt->conn, tc, &rc);
+	err = p9_client_rpc(clnt, tc, &rc);
 	if (err)
 		goto done;
 
@@ -443,7 +533,7 @@ int p9_client_remove(struct p9_fid *fid)
 		goto done;
 	}
 
-	err = p9_conn_rpc(clnt->conn, tc, &rc);
+	err = p9_client_rpc(clnt, tc, &rc);
 	if (err)
 		goto done;
 
@@ -485,7 +575,7 @@ int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count)
 			goto error;
 		}
 
-		err = p9_conn_rpc(clnt->conn, tc, &rc);
+		err = p9_client_rpc(clnt, tc, &rc);
 		if (err)
 			goto error;
 
@@ -542,7 +632,7 @@ int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count)
 			goto error;
 		}
 
-		err = p9_conn_rpc(clnt->conn, tc, &rc);
+		err = p9_client_rpc(clnt, tc, &rc);
 		if (err)
 			goto error;
 
@@ -596,7 +686,7 @@ p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count)
 			goto error;
 		}
 
-		err = p9_conn_rpc(clnt->conn, tc, &rc);
+		err = p9_client_rpc(clnt, tc, &rc);
 		if (err)
 			goto error;
 
@@ -660,7 +750,7 @@ p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset,
 			goto error;
 		}
 
-		err = p9_conn_rpc(clnt->conn, tc, &rc);
+		err = p9_client_rpc(clnt, tc, &rc);
 		if (err)
 			goto error;
 
@@ -731,7 +821,7 @@ struct p9_stat *p9_client_stat(struct p9_fid *fid)
 		goto error;
 	}
 
-	err = p9_conn_rpc(clnt->conn, tc, &rc);
+	err = p9_client_rpc(clnt, tc, &rc);
 	if (err)
 		goto error;
 
@@ -773,7 +863,7 @@ int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
 		goto done;
 	}
 
-	err = p9_conn_rpc(clnt->conn, tc, &rc);
+	err = p9_client_rpc(clnt, tc, &rc);
 
 done:
 	kfree(tc);
@@ -830,7 +920,7 @@ struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset)
 				goto error;
 			}
 
-			err = p9_conn_rpc(clnt->conn, tc, &rc);
+			err = p9_client_rpc(clnt, tc, &rc);
 			if (err)
 				goto error;
 
@@ -901,16 +991,21 @@ static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu)
 	memmove(ret, st, sizeof(struct p9_stat));
 	p = ((char *) ret) + sizeof(struct p9_stat);
 	memmove(p, st->name.str, st->name.len);
+	ret->name.str = p;
 	p += st->name.len;
 	memmove(p, st->uid.str, st->uid.len);
+	ret->uid.str = p;
 	p += st->uid.len;
 	memmove(p, st->gid.str, st->gid.len);
+	ret->gid.str = p;
 	p += st->gid.len;
 	memmove(p, st->muid.str, st->muid.len);
+	ret->muid.str = p;
 	p += st->muid.len;
 
 	if (dotu) {
 		memmove(p, st->extension.str, st->extension.len);
+		ret->extension.str = p;
 		p += st->extension.len;
 	}
 

net/9p/fcprint.c

@@ -347,12 +347,12 @@ p9_printfcall(char *buf, int buflen, struct p9_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 */
+EXPORT_SYMBOL(p9_printfcall);
+

net/9p/mod.c

@@ -106,15 +106,10 @@ EXPORT_SYMBOL(v9fs_default_trans);
  */
 static int __init init_p9(void)
 {
-	int ret;
+	int ret = 0;
 
 	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;
-	}
 
 	return ret;
 }
@@ -126,7 +121,7 @@ static int __init init_p9(void)
 
 static void __exit exit_p9(void)
 {
-	p9_mux_global_exit();
+	printk(KERN_INFO "Unloading 9P2000 support\n");
 }
 
 module_init(init_p9)

net/9p/util.c

@@ -33,7 +33,7 @@
 #include <net/9p/9p.h>
 
 struct p9_idpool {
-	struct semaphore lock;
+	spinlock_t lock;
 	struct idr pool;
 };
 
@@ -45,7 +45,7 @@ struct p9_idpool *p9_idpool_create(void)
 	if (!p)
 		return ERR_PTR(-ENOMEM);
 
-	init_MUTEX(&p->lock);
+	spin_lock_init(&p->lock);
 	idr_init(&p->pool);
 
 	return p;
@@ -71,19 +71,17 @@ int p9_idpool_get(struct p9_idpool *p)
 {
 	int i = 0;
 	int error;
+	unsigned int flags;
 
 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;
-	}
+	spin_lock_irqsave(&p->lock, flags);
 
 	/* no need to store exactly p, we just need something non-null */
 	error = idr_get_new(&p->pool, p, &i);
-	up(&p->lock);
+	spin_unlock_irqrestore(&p->lock, flags);
 
 	if (error == -EAGAIN)
 		goto retry;
@@ -104,12 +102,10 @@ EXPORT_SYMBOL(p9_idpool_get);
 
 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;
-	}
+	unsigned int flags;
+	spin_lock_irqsave(&p->lock, flags);
 	idr_remove(&p->pool, id);
-	up(&p->lock);
+	spin_unlock_irqrestore(&p->lock, flags);
 }
 EXPORT_SYMBOL(p9_idpool_put);