Creation of Cybook 2416 (actually Gen4) repository

fs/9p/9p.h

@@ -0,0 +1,375 @@
+/*
+ * 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

@@ -0,0 +1,18 @@
+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.c

@@ -0,0 +1,845 @@
+/*
+ * linux/fs/9p/conv.c
+ *
+ * 9P protocol conversion functions
+ *
+ *  Copyright (C) 2004, 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
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#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"
+
+/*
+ * Buffer to help with string parsing
+ */
+struct cbuf {
+	unsigned char *sp;
+	unsigned char *p;
+	unsigned char *ep;
+};
+
+static inline void buf_init(struct cbuf *buf, void *data, int datalen)
+{
+	buf->sp = buf->p = data;
+	buf->ep = data + datalen;
+}
+
+static inline int buf_check_overflow(struct cbuf *buf)
+{
+	return buf->p > buf->ep;
+}
+
+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));
+			dump_stack();
+			buf->p = buf->ep + 1;
+		}
+
+		return 0;
+	}
+
+	return 1;
+}
+
+static void *buf_alloc(struct cbuf *buf, int len)
+{
+	void *ret = NULL;
+
+	if (buf_check_size(buf, len)) {
+		ret = buf->p;
+		buf->p += len;
+	}
+
+	return ret;
+}
+
+static void buf_put_int8(struct cbuf *buf, u8 val)
+{
+	if (buf_check_size(buf, 1)) {
+		buf->p[0] = val;
+		buf->p++;
+	}
+}
+
+static void buf_put_int16(struct cbuf *buf, u16 val)
+{
+	if (buf_check_size(buf, 2)) {
+		*(__le16 *) buf->p = cpu_to_le16(val);
+		buf->p += 2;
+	}
+}
+
+static void buf_put_int32(struct cbuf *buf, u32 val)
+{
+	if (buf_check_size(buf, 4)) {
+		*(__le32 *)buf->p = cpu_to_le32(val);
+		buf->p += 4;
+	}
+}
+
+static void buf_put_int64(struct cbuf *buf, u64 val)
+{
+	if (buf_check_size(buf, 8)) {
+		*(__le64 *)buf->p = cpu_to_le64(val);
+		buf->p += 8;
+	}
+}
+
+static char *buf_put_stringn(struct cbuf *buf, const char *s, u16 slen)
+{
+	char *ret;
+
+	ret = NULL;
+	if (buf_check_size(buf, slen + 2)) {
+		buf_put_int16(buf, slen);
+		ret = buf->p;
+		memcpy(buf->p, s, slen);
+		buf->p += slen;
+	}
+
+	return ret;
+}
+
+static inline void buf_put_string(struct cbuf *buf, const char *s)
+{
+	buf_put_stringn(buf, s, strlen(s));
+}
+
+static u8 buf_get_int8(struct cbuf *buf)
+{
+	u8 ret = 0;
+
+	if (buf_check_size(buf, 1)) {
+		ret = buf->p[0];
+		buf->p++;
+	}
+
+	return ret;
+}
+
+static u16 buf_get_int16(struct cbuf *buf)
+{
+	u16 ret = 0;
+
+	if (buf_check_size(buf, 2)) {
+		ret = le16_to_cpu(*(__le16 *)buf->p);
+		buf->p += 2;
+	}
+
+	return ret;
+}
+
+static u32 buf_get_int32(struct cbuf *buf)
+{
+	u32 ret = 0;
+
+	if (buf_check_size(buf, 4)) {
+		ret = le32_to_cpu(*(__le32 *)buf->p);
+		buf->p += 4;
+	}
+
+	return ret;
+}
+
+static u64 buf_get_int64(struct cbuf *buf)
+{
+	u64 ret = 0;
+
+	if (buf_check_size(buf, 8)) {
+		ret = le64_to_cpu(*(__le64 *)buf->p);
+		buf->p += 8;
+	}
+
+	return ret;
+}
+
+static void buf_get_str(struct cbuf *buf, struct v9fs_str *vstr)
+{
+	vstr->len = buf_get_int16(buf);
+	if (!buf_check_overflow(buf) && buf_check_size(buf, vstr->len)) {
+		vstr->str = buf->p;
+		buf->p += vstr->len;
+	} else {
+		vstr->len = 0;
+		vstr->str = NULL;
+	}
+}
+
+static void buf_get_qid(struct cbuf *bufp, struct v9fs_qid *qid)
+{
+	qid->type = buf_get_int8(bufp);
+	qid->version = buf_get_int32(bufp);
+	qid->path = buf_get_int64(bufp);
+}
+
+/**
+ * v9fs_size_wstat - calculate the size of a variable length stat struct
+ * @stat: metadata (stat) structure
+ * @extended: non-zero if 9P2000.u
+ *
+ */
+
+static int v9fs_size_wstat(struct v9fs_wstat *wstat, int extended)
+{
+	int size = 0;
+
+	if (wstat == NULL) {
+		eprintk(KERN_ERR, "v9fs_size_stat: got a NULL stat pointer\n");
+		return 0;
+	}
+
+	size =			/* 2 + *//* size[2] */
+	    2 +			/* type[2] */
+	    4 +			/* dev[4] */
+	    1 +			/* qid.type[1] */
+	    4 +			/* qid.vers[4] */
+	    8 +			/* qid.path[8] */
+	    4 +			/* mode[4] */
+	    4 +			/* atime[4] */
+	    4 +			/* mtime[4] */
+	    8 +			/* length[8] */
+	    8;			/* minimum sum of string lengths */
+
+	if (wstat->name)
+		size += strlen(wstat->name);
+	if (wstat->uid)
+		size += strlen(wstat->uid);
+	if (wstat->gid)
+		size += strlen(wstat->gid);
+	if (wstat->muid)
+		size += strlen(wstat->muid);
+
+	if (extended) {
+		size += 4 +	/* n_uid[4] */
+		    4 +		/* n_gid[4] */
+		    4 +		/* n_muid[4] */
+		    2;		/* string length of extension[4] */
+		if (wstat->extension)
+			size += strlen(wstat->extension);
+	}
+
+	return size;
+}
+
+/**
+ * buf_get_stat - safely decode a recieved metadata (stat) structure
+ * @bufp: buffer to deserialize
+ * @stat: metadata (stat) structure
+ * @extended: non-zero if 9P2000.u
+ *
+ */
+
+static void
+buf_get_stat(struct cbuf *bufp, struct v9fs_stat *stat, int extended)
+{
+	stat->size = buf_get_int16(bufp);
+	stat->type = buf_get_int16(bufp);
+	stat->dev = buf_get_int32(bufp);
+	stat->qid.type = buf_get_int8(bufp);
+	stat->qid.version = buf_get_int32(bufp);
+	stat->qid.path = buf_get_int64(bufp);
+	stat->mode = buf_get_int32(bufp);
+	stat->atime = buf_get_int32(bufp);
+	stat->mtime = buf_get_int32(bufp);
+	stat->length = buf_get_int64(bufp);
+	buf_get_str(bufp, &stat->name);
+	buf_get_str(bufp, &stat->uid);
+	buf_get_str(bufp, &stat->gid);
+	buf_get_str(bufp, &stat->muid);
+
+	if (extended) {
+		buf_get_str(bufp, &stat->extension);
+		stat->n_uid = buf_get_int32(bufp);
+		stat->n_gid = buf_get_int32(bufp);
+		stat->n_muid = buf_get_int32(bufp);
+	}
+}
+
+/**
+ * v9fs_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
+ *
+ * Note: stat will point to the buf region.
+ */
+
+int
+v9fs_deserialize_stat(void *buf, u32 buflen, struct v9fs_stat *stat,
+		int extended)
+{
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+	unsigned char *p;
+
+	buf_init(bufp, buf, buflen);
+	p = bufp->p;
+	buf_get_stat(bufp, stat, extended);
+
+	if (buf_check_overflow(bufp))
+		return 0;
+	else
+		return bufp->p - p;
+}
+
+/**
+ * deserialize_fcall - unmarshal a response
+ * @buf: recieved buffer
+ * @buflen: length of received buffer
+ * @rcall: fcall structure to populate
+ * @rcalllen: length of fcall structure to populate
+ * @extended: non-zero if 9P2000.u
+ *
+ */
+
+int
+v9fs_deserialize_fcall(void *buf, u32 buflen, struct v9fs_fcall *rcall,
+		       int extended)
+{
+
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+	int i = 0;
+
+	buf_init(bufp, buf, buflen);
+
+	rcall->size = buf_get_int32(bufp);
+	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);
+
+	switch (rcall->id) {
+	default:
+		eprintk(KERN_ERR, "unknown message type: %d\n", rcall->id);
+		return -EPROTO;
+	case RVERSION:
+		rcall->params.rversion.msize = buf_get_int32(bufp);
+		buf_get_str(bufp, &rcall->params.rversion.version);
+		break;
+	case RFLUSH:
+		break;
+	case 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:
+		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);
+			return -EPROTO;
+		}
+
+		for (i = 0; i < rcall->params.rwalk.nwqid; i++)
+			buf_get_qid(bufp, &rcall->params.rwalk.wqids[i]);
+		break;
+	case ROPEN:
+		buf_get_qid(bufp, &rcall->params.ropen.qid);
+		rcall->params.ropen.iounit = buf_get_int32(bufp);
+		break;
+	case RCREATE:
+		buf_get_qid(bufp, &rcall->params.rcreate.qid);
+		rcall->params.rcreate.iounit = buf_get_int32(bufp);
+		break;
+	case 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:
+		rcall->params.rwrite.count = buf_get_int32(bufp);
+		break;
+	case RCLUNK:
+		break;
+	case RREMOVE:
+		break;
+	case RSTAT:
+		buf_get_int16(bufp);
+		buf_get_stat(bufp, &rcall->params.rstat.stat, extended);
+		break;
+	case RWSTAT:
+		break;
+	case RERROR:
+		buf_get_str(bufp, &rcall->params.rerror.error);
+		if (extended)
+			rcall->params.rerror.errno = buf_get_int16(bufp);
+		break;
+	}
+
+	if (buf_check_overflow(bufp)) {
+		dprintk(DEBUG_ERROR, "buffer overflow\n");
+		return -EIO;
+	}
+
+	return bufp->p - bufp->sp;
+}
+
+static inline void v9fs_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)
+{
+	*p = val;
+	buf_put_int16(bufp, val);
+}
+
+static inline void v9fs_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)
+{
+	*p = val;
+	buf_put_int64(bufp, val);
+}
+
+static void
+v9fs_put_str(struct cbuf *bufp, char *data, struct v9fs_str *str)
+{
+	int len;
+	char *s;
+
+	if (data)
+		len = strlen(data);
+	else
+		len = 0;
+
+	s = buf_put_stringn(bufp, data, len);
+	if (str) {
+		str->len = len;
+		str->str = s;
+	}
+}
+
+static int
+v9fs_put_user_data(struct cbuf *bufp, const char __user * data, int count,
+		   unsigned char **pdata)
+{
+	*pdata = buf_alloc(bufp, count);
+	return copy_from_user(*pdata, data, count);
+}
+
+static void
+v9fs_put_wstat(struct cbuf *bufp, struct v9fs_wstat *wstat,
+	       struct v9fs_stat *stat, int statsz, int extended)
+{
+	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);
+
+	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);
+
+	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);
+	}
+}
+
+static struct v9fs_fcall *
+v9fs_create_common(struct cbuf *bufp, u32 size, u8 id)
+{
+	struct v9fs_fcall *fc;
+
+	size += 4 + 1 + 2;	/* size[4] id[1] tag[2] */
+	fc = kmalloc(sizeof(struct v9fs_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);
+
+	return fc;
+}
+
+void v9fs_set_tag(struct v9fs_fcall *fc, u16 tag)
+{
+	fc->tag = tag;
+	*(__le16 *) (fc->sdata + 5) = cpu_to_le16(tag);
+}
+
+struct v9fs_fcall *v9fs_create_tversion(u32 msize, char *version)
+{
+	int size;
+	struct v9fs_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);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, msize, &fc->params.tversion.msize);
+	v9fs_put_str(bufp, version, &fc->params.tversion.version);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+#if 0
+struct v9fs_fcall *v9fs_create_tauth(u32 afid, char *uname, char *aname)
+{
+	int size;
+	struct v9fs_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);
+	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);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+#endif  /*  0  */
+
+struct v9fs_fcall *
+v9fs_create_tattach(u32 fid, u32 afid, char *uname, char *aname)
+{
+	int size;
+	struct v9fs_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);
+	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);
+
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_tflush(u16 oldtag)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 2;		/* oldtag[2] */
+	fc = v9fs_create_common(bufp, size, TFLUSH);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int16(bufp, oldtag, &fc->params.tflush.oldtag);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_twalk(u32 fid, u32 newfid, u16 nwname,
+				     char **wnames)
+{
+	int i, size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	if (nwname > V9FS_MAXWELEM) {
+		dprintk(DEBUG_ERROR, "nwname > %d\n", V9FS_MAXWELEM);
+		return NULL;
+	}
+
+	size = 4 + 4 + 2;	/* fid[4] newfid[4] nwname[2] ... */
+	for (i = 0; i < nwname; i++) {
+		size += 2 + strlen(wnames[i]);	/* wname[s] */
+	}
+
+	fc = v9fs_create_common(bufp, size, 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);
+	for (i = 0; i < nwname; i++) {
+		v9fs_put_str(bufp, wnames[i], &fc->params.twalk.wnames[i]);
+	}
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_topen(u32 fid, u8 mode)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 4 + 1;		/* fid[4] mode[1] */
+	fc = v9fs_create_common(bufp, size, 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);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_tcreate(u32 fid, char *name, u32 perm, u8 mode,
+	char *extension, int extended)
+{
+	int size;
+	struct v9fs_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) {
+		size += 2 +			/* extension[s] */
+		    (extension == NULL ? 0 : strlen(extension));
+	}
+
+	fc = v9fs_create_common(bufp, size, 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);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_tread(u32 fid, u64 offset, u32 count)
+{
+	int size;
+	struct v9fs_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);
+	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);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_twrite(u32 fid, u64 offset, u32 count,
+				      const char __user * data)
+{
+	int size, err;
+	struct v9fs_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);
+	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);
+	if (err) {
+		kfree(fc);
+		fc = ERR_PTR(err);
+	}
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_tclunk(u32 fid)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 4;		/* fid[4] */
+	fc = v9fs_create_common(bufp, size, TCLUNK);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, fid, &fc->params.tclunk.fid);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_tremove(u32 fid)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 4;		/* fid[4] */
+	fc = v9fs_create_common(bufp, size, TREMOVE);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, fid, &fc->params.tremove.fid);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_tstat(u32 fid)
+{
+	int size;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	size = 4;		/* fid[4] */
+	fc = v9fs_create_common(bufp, size, TSTAT);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_put_int32(bufp, fid, &fc->params.tstat.fid);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}
+
+struct v9fs_fcall *v9fs_create_twstat(u32 fid, struct v9fs_wstat *wstat,
+				      int extended)
+{
+	int size, statsz;
+	struct v9fs_fcall *fc;
+	struct cbuf buffer;
+	struct cbuf *bufp = &buffer;
+
+	statsz = v9fs_size_wstat(wstat, extended);
+	size = 4 + 2 + 2 + statsz;	/* fid[4] stat[n] */
+	fc = v9fs_create_common(bufp, size, TWSTAT);
+	if (IS_ERR(fc))
+		goto error;
+
+	v9fs_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);
+
+	if (buf_check_overflow(bufp)) {
+		kfree(fc);
+		fc = ERR_PTR(-ENOMEM);
+	}
+      error:
+	return fc;
+}

fs/9p/conv.h

@@ -0,0 +1,50 @@
+/*
+ * 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

@@ -0,0 +1,77 @@
+/*
+ *  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

@@ -0,0 +1,93 @@
+/*
+ * 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/error.h

@@ -0,0 +1,177 @@
+/*
+ * linux/fs/9p/error.h
+ *
+ * Huge Nasty Error Table
+ *
+ * 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.
+ *
+ *  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/errno.h>
+#include <asm/errno.h>
+
+struct errormap {
+	char *name;
+	int val;
+
+	int namelen;
+	struct hlist_node list;
+};
+
+#define ERRHASHSZ		32
+static struct hlist_head hash_errmap[ERRHASHSZ];
+
+/* FixMe - reduce to a reasonable size */
+static struct errormap errmap[] = {
+	{"Operation not permitted", EPERM},
+	{"wstat prohibited", EPERM},
+	{"No such file or directory", ENOENT},
+	{"directory entry not found", ENOENT},
+	{"file not found", ENOENT},
+	{"Interrupted system call", EINTR},
+	{"Input/output error", EIO},
+	{"No such device or address", ENXIO},
+	{"Argument list too long", E2BIG},
+	{"Bad file descriptor", EBADF},
+	{"Resource temporarily unavailable", EAGAIN},
+	{"Cannot allocate memory", ENOMEM},
+	{"Permission denied", EACCES},
+	{"Bad address", EFAULT},
+	{"Block device required", ENOTBLK},
+	{"Device or resource busy", EBUSY},
+	{"File exists", EEXIST},
+	{"Invalid cross-device link", EXDEV},
+	{"No such device", ENODEV},
+	{"Not a directory", ENOTDIR},
+	{"Is a directory", EISDIR},
+	{"Invalid argument", EINVAL},
+	{"Too many open files in system", ENFILE},
+	{"Too many open files", EMFILE},
+	{"Text file busy", ETXTBSY},
+	{"File too large", EFBIG},
+	{"No space left on device", ENOSPC},
+	{"Illegal seek", ESPIPE},
+	{"Read-only file system", EROFS},
+	{"Too many links", EMLINK},
+	{"Broken pipe", EPIPE},
+	{"Numerical argument out of domain", EDOM},
+	{"Numerical result out of range", ERANGE},
+	{"Resource deadlock avoided", EDEADLK},
+	{"File name too long", ENAMETOOLONG},
+	{"No locks available", ENOLCK},
+	{"Function not implemented", ENOSYS},
+	{"Directory not empty", ENOTEMPTY},
+	{"Too many levels of symbolic links", ELOOP},
+	{"No message of desired type", ENOMSG},
+	{"Identifier removed", EIDRM},
+	{"No data available", ENODATA},
+	{"Machine is not on the network", ENONET},
+	{"Package not installed", ENOPKG},
+	{"Object is remote", EREMOTE},
+	{"Link has been severed", ENOLINK},
+	{"Communication error on send", ECOMM},
+	{"Protocol error", EPROTO},
+	{"Bad message", EBADMSG},
+	{"File descriptor in bad state", EBADFD},
+	{"Streams pipe error", ESTRPIPE},
+	{"Too many users", EUSERS},
+	{"Socket operation on non-socket", ENOTSOCK},
+	{"Message too long", EMSGSIZE},
+	{"Protocol not available", ENOPROTOOPT},
+	{"Protocol not supported", EPROTONOSUPPORT},
+	{"Socket type not supported", ESOCKTNOSUPPORT},
+	{"Operation not supported", EOPNOTSUPP},
+	{"Protocol family not supported", EPFNOSUPPORT},
+	{"Network is down", ENETDOWN},
+	{"Network is unreachable", ENETUNREACH},
+	{"Network dropped connection on reset", ENETRESET},
+	{"Software caused connection abort", ECONNABORTED},
+	{"Connection reset by peer", ECONNRESET},
+	{"No buffer space available", ENOBUFS},
+	{"Transport endpoint is already connected", EISCONN},
+	{"Transport endpoint is not connected", ENOTCONN},
+	{"Cannot send after transport endpoint shutdown", ESHUTDOWN},
+	{"Connection timed out", ETIMEDOUT},
+	{"Connection refused", ECONNREFUSED},
+	{"Host is down", EHOSTDOWN},
+	{"No route to host", EHOSTUNREACH},
+	{"Operation already in progress", EALREADY},
+	{"Operation now in progress", EINPROGRESS},
+	{"Is a named type file", EISNAM},
+	{"Remote I/O error", EREMOTEIO},
+	{"Disk quota exceeded", EDQUOT},
+/* errors from fossil, vacfs, and u9fs */
+	{"fid unknown or out of range", EBADF},
+	{"permission denied", EACCES},
+	{"file does not exist", ENOENT},
+	{"authentication failed", ECONNREFUSED},
+	{"bad offset in directory read", ESPIPE},
+	{"bad use of fid", EBADF},
+	{"wstat can't convert between files and directories", EPERM},
+	{"directory is not empty", ENOTEMPTY},
+	{"file exists", EEXIST},
+	{"file already exists", EEXIST},
+	{"file or directory already exists", EEXIST},
+	{"fid already in use", EBADF},
+	{"file in use", ETXTBSY},
+	{"i/o error", EIO},
+	{"file already open for I/O", ETXTBSY},
+	{"illegal mode", EINVAL},
+	{"illegal name", ENAMETOOLONG},
+	{"not a directory", ENOTDIR},
+	{"not a member of proposed group", EPERM},
+	{"not owner", EACCES},
+	{"only owner can change group in wstat", EACCES},
+	{"read only file system", EROFS},
+	{"no access to special file", EPERM},
+	{"i/o count too large", EIO},
+	{"unknown group", EINVAL},
+	{"unknown user", EINVAL},
+	{"bogus wstat buffer", EPROTO},
+	{"exclusive use file already open", EAGAIN},
+	{"corrupted directory entry", EIO},
+	{"corrupted file entry", EIO},
+	{"corrupted block label", EIO},
+	{"corrupted meta data", EIO},
+	{"illegal offset", EINVAL},
+	{"illegal path element", ENOENT},
+	{"root of file system is corrupted", EIO},
+	{"corrupted super block", EIO},
+	{"protocol botch", EPROTO},
+	{"file system is full", ENOSPC},
+	{"file is in use", EAGAIN},
+	{"directory entry is not allocated", ENOENT},
+	{"file is read only", EROFS},
+	{"file has been removed", EIDRM},
+	{"only support truncation to zero length", EPERM},
+	{"cannot remove root", EPERM},
+	{"file too big", EFBIG},
+	{"venti i/o error", EIO},
+	/* these are not errors */
+	{"u9fs rhostsauth: no authentication required", 0},
+	{"u9fs authnone: no authentication required", 0},
+	{NULL, -1}
+};
+
+extern int v9fs_error_init(void);

fs/9p/fcall.c

@@ -0,0 +1,427 @@
+/*
+ *  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/fcprint.c

@@ -0,0 +1,345 @@
+/*
+ *  linux/fs/9p/fcprint.c
+ *
+ *  Print 9P call.
+ *
+ *  Copyright (C) 2005 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 "debug.h"
+#include "v9fs.h"
+#include "9p.h"
+#include "mux.h"
+
+static int
+v9fs_printqid(char *buf, int buflen, struct v9fs_qid *q)
+{
+	int n;
+	char b[10];
+
+	n = 0;
+	if (q->type & V9FS_QTDIR)
+		b[n++] = 'd';
+	if (q->type & V9FS_QTAPPEND)
+		b[n++] = 'a';
+	if (q->type & V9FS_QTAUTH)
+		b[n++] = 'A';
+	if (q->type & V9FS_QTEXCL)
+		b[n++] = 'l';
+	if (q->type & V9FS_QTTMP)
+		b[n++] = 't';
+	if (q->type & V9FS_QTSYMLINK)
+		b[n++] = 'L';
+	b[n] = '\0';
+
+	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)
+{
+	int n;
+	char b[15];
+
+	n = 0;
+	if (perm & V9FS_DMDIR)
+		b[n++] = 'd';
+	if (perm & V9FS_DMAPPEND)
+		b[n++] = 'a';
+	if (perm & V9FS_DMAUTH)
+		b[n++] = 'A';
+	if (perm & V9FS_DMEXCL)
+		b[n++] = 'l';
+	if (perm & V9FS_DMTMP)
+		b[n++] = 't';
+	if (perm & V9FS_DMDEVICE)
+		b[n++] = 'D';
+	if (perm & V9FS_DMSOCKET)
+		b[n++] = 'S';
+	if (perm & V9FS_DMNAMEDPIPE)
+		b[n++] = 'P';
+	if (perm & V9FS_DMSYMLINK)
+		b[n++] = 'L';
+	b[n] = '\0';
+
+	return scnprintf(buf, buflen, "%s%03o", b, perm&077);
+}
+
+static int
+v9fs_printstat(char *buf, int buflen, struct v9fs_stat *st, int extended)
+{
+	int n;
+
+	n = scnprintf(buf, buflen, "'%.*s' '%.*s'", st->name.len,
+		st->name.str, st->uid.len, st->uid.str);
+	if (extended)
+		n += scnprintf(buf+n, buflen-n, "(%d)", st->n_uid);
+
+	n += scnprintf(buf+n, buflen-n, " '%.*s'", st->gid.len, st->gid.str);
+	if (extended)
+		n += scnprintf(buf+n, buflen-n, "(%d)", st->n_gid);
+
+	n += scnprintf(buf+n, buflen-n, " '%.*s'", st->muid.len, st->muid.str);
+	if (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 += scnprintf(buf+n, buflen-n, " m ");
+	n += v9fs_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);
+
+	if (extended)
+		n += scnprintf(buf+n, buflen-n, " ext '%.*s'",
+			st->extension.len, st->extension.str);
+
+	return n;
+}
+
+static int
+v9fs_dumpdata(char *buf, int buflen, u8 *data, int datalen)
+{
+	int i, n;
+
+	i = n = 0;
+	while (i < datalen) {
+		n += scnprintf(buf + n, buflen - n, "%02x", data[i]);
+		if (i%4 == 3)
+			n += scnprintf(buf + n, buflen - n, " ");
+		if (i%32 == 31)
+			n += scnprintf(buf + n, buflen - n, "\n");
+
+		i++;
+	}
+	n += scnprintf(buf + n, buflen - n, "\n");
+
+	return n;
+}
+
+static int
+v9fs_printdata(char *buf, int buflen, u8 *data, int datalen)
+{
+	return v9fs_dumpdata(buf, buflen, data, datalen<16?datalen:16);
+}
+
+int
+v9fs_printfcall(char *buf, int buflen, struct v9fs_fcall *fc, int extended)
+{
+	int i, ret, type, tag;
+
+	if (!fc)
+		return scnprintf(buf, buflen, "<NULL>");
+
+	type = fc->id;
+	tag = fc->tag;
+
+	ret = 0;
+	switch (type) {
+	case 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);
+		break;
+
+	case 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);
+		break;
+
+	case 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,
+			fc->params.tauth.uname.str, fc->params.tauth.aname.len,
+			fc->params.tauth.aname.str);
+		break;
+
+	case RAUTH:
+		ret += scnprintf(buf+ret, buflen-ret, "Rauth tag %u qid ", tag);
+		v9fs_printqid(buf+ret, buflen-ret, &fc->params.rauth.qid);
+		break;
+
+	case 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);
+		break;
+
+	case RATTACH:
+		ret += scnprintf(buf+ret, buflen-ret, "Rattach tag %u qid ", tag);
+		v9fs_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);
+		if (extended)
+			ret += scnprintf(buf+ret, buflen-ret, " ecode %d\n",
+				fc->params.rerror.errno);
+		break;
+
+	case TFLUSH:
+		ret += scnprintf(buf+ret, buflen-ret, "Tflush tag %u oldtag %u",
+			tag, fc->params.tflush.oldtag);
+		break;
+
+	case RFLUSH:
+		ret += scnprintf(buf+ret, buflen-ret, "Rflush tag %u", tag);
+		break;
+
+	case 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'",
+				fc->params.twalk.wnames[i].len,
+				fc->params.twalk.wnames[i].str);
+		break;
+
+	case 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,
+				&fc->params.rwalk.wqids[i]);
+		break;
+
+	case 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:
+		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",
+			fc->params.ropen.iounit);
+		break;
+
+	case 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 += scnprintf(buf+ret, buflen-ret, " mode %d",
+			fc->params.tcreate.mode);
+		break;
+
+	case RCREATE:
+		ret += scnprintf(buf+ret, buflen-ret, "Rcreate tag %u", tag);
+		ret += v9fs_printqid(buf+ret, buflen-ret, &fc->params.rcreate.qid);
+		ret += scnprintf(buf+ret, buflen-ret, " iounit %d",
+			fc->params.rcreate.iounit);
+		break;
+
+	case TREAD:
+		ret += scnprintf(buf+ret, buflen-ret,
+			"Tread tag %u fid %d offset %lld count %u", tag,
+			fc->params.tread.fid,
+			(long long int) fc->params.tread.offset,
+			fc->params.tread.count);
+		break;
+
+	case 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,
+			fc->params.rread.count);
+		break;
+
+	case 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,
+			fc->params.twrite.count);
+		break;
+
+	case RWRITE:
+		ret += scnprintf(buf+ret, buflen-ret, "Rwrite tag %u count %u",
+			tag, fc->params.rwrite.count);
+		break;
+
+	case TCLUNK:
+		ret += scnprintf(buf+ret, buflen-ret, "Tclunk tag %u fid %d",
+			tag, fc->params.tclunk.fid);
+		break;
+
+	case RCLUNK:
+		ret += scnprintf(buf+ret, buflen-ret, "Rclunk tag %u", tag);
+		break;
+
+	case TREMOVE:
+		ret += scnprintf(buf+ret, buflen-ret, "Tremove tag %u fid %d",
+			tag, fc->params.tremove.fid);
+		break;
+
+	case RREMOVE:
+		ret += scnprintf(buf+ret, buflen-ret, "Rremove tag %u", tag);
+		break;
+
+	case TSTAT:
+		ret += scnprintf(buf+ret, buflen-ret, "Tstat tag %u fid %d",
+			tag, fc->params.tstat.fid);
+		break;
+
+	case RSTAT:
+		ret += scnprintf(buf+ret, buflen-ret, "Rstat tag %u ", tag);
+		ret += v9fs_printstat(buf+ret, buflen-ret, &fc->params.rstat.stat,
+			extended);
+		break;
+
+	case 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);
+		break;
+
+	case RWSTAT:
+		ret += scnprintf(buf+ret, buflen-ret, "Rwstat tag %u", tag);
+		break;
+
+	default:
+		ret += scnprintf(buf+ret, buflen-ret, "unknown type %d", type);
+		break;
+	}
+
+	return ret;
+}

fs/9p/fid.c

@@ -0,0 +1,194 @@
+/*
+ * V9FS FID Management
+ *
+ *  Copyright (C) 2005, 2006 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
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/idr.h>
+#include <asm/semaphore.h>
+
+#include "debug.h"
+#include "v9fs.h"
+#include "9p.h"
+#include "v9fs_vfs.h"
+#include "fid.h"
+
+/**
+ * v9fs_fid_insert - add a fid to a dentry
+ * @fid: fid to add
+ * @dentry: dentry that it is being added to
+ *
+ */
+
+int v9fs_fid_insert(struct v9fs_fid *fid, struct dentry *dentry)
+{
+	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 */
+	}
+
+	fid->uid = current->uid;
+	list_add(&fid->list, fid_list);
+	return 0;
+}
+
+/**
+ * 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;
+
+	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);
+	}
+
+	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
+ *
+ */
+
+void v9fs_fid_destroy(struct v9fs_fid *fid)
+{
+	list_del(&fid->list);
+	kfree(fid);
+}
+
+/**
+ * v9fs_fid_lookup - return a locked fid from a dentry
+ * @dentry: dentry to look for fid in
+ *
+ * find a fid in the dentry, obtain its semaphore and return a reference to it.
+ * code calling lookup is responsible for releasing lock
+ *
+ * TODO: only match fids that have the same uid as current user
+ *
+ */
+
+struct v9fs_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);
+
+	if (!return_fid) {
+		dprintk(DEBUG_ERROR, "Couldn't find a fid in dentry\n");
+		return_fid = ERR_PTR(-EBADF);
+	}
+
+	if(down_interruptible(&return_fid->lock))
+		return ERR_PTR(-EINTR);
+
+	return return_fid;
+}
+
+/**
+ * v9fs_fid_clone - lookup the fid for a dentry, clone a private copy and
+ * 			release it
+ * @dentry: dentry to look for fid in
+ *
+ * find a fid in the dentry and then clone to a new private fid
+ *
+ * TODO: only match fids that have the same uid as current user
+ *
+ */
+
+struct v9fs_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);
+	}
+
+Release_Fid:
+	up(&base_fid->lock);
+	return new_fid;
+}
+
+void v9fs_fid_clunk(struct v9fs_session_info *v9ses, struct v9fs_fid *fid)
+{
+	v9fs_t_clunk(v9ses, fid->fid);
+	v9fs_fid_destroy(fid);
+}

fs/9p/fid.h

@@ -0,0 +1,62 @@
+/*
+ * V9FS FID Management
+ *
+ *  Copyright (C) 2005 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
+ *
+ */
+
+#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_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);
+

fs/9p/mux.h

@@ -0,0 +1,55 @@
+/*
+ * linux/fs/9p/mux.h
+ *
+ * Multiplexer 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
+ *
+ */
+
+struct v9fs_mux_data;
+struct v9fs_req;
+
+/**
+ * v9fs_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.
+ *
+ * @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);
+
+int v9fs_mux_global_init(void);
+void v9fs_mux_global_exit(void);
+
+struct v9fs_mux_data *v9fs_mux_init(struct v9fs_transport *trans, int msize,
+	unsigned char *extended);
+void v9fs_mux_destroy(struct v9fs_mux_data *);
+
+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 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);

fs/9p/trans_fd.c

@@ -0,0 +1,308 @@
+/*
+ * 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/transport.h

@@ -0,0 +1,45 @@
+/*
+ * linux/fs/9p/transport.h
+ *
+ * Transport Definition
+ *
+ *  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
+ *
+ */
+
+enum v9fs_transport_status {
+	Connected,
+	Disconnected,
+	Hung,
+};
+
+struct v9fs_transport {
+	enum v9fs_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 *);
+};
+
+extern struct v9fs_transport v9fs_trans_tcp;
+extern struct v9fs_transport v9fs_trans_unix;
+extern struct v9fs_transport v9fs_trans_fd;

fs/9p/v9fs.c

@@ -0,0 +1,499 @@
+/*
+ *  linux/fs/9p/v9fs.c
+ *
+ *  This file contains functions assisting in mapping VFS to 9P2000
+ *
+ *  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 "debug.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)
+  *
+  */
+
+enum {
+	/* Options that take integer arguments */
+	Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid, Opt_debug,
+	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,
+	/* Cache options */
+	Opt_cache_loose,
+	/* Error token */
+	Opt_err
+};
+
+static match_table_t tokens = {
+	{Opt_port, "port=%u"},
+	{Opt_msize, "msize=%u"},
+	{Opt_uid, "uid=%u"},
+	{Opt_gid, "gid=%u"},
+	{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"},
+	{Opt_tcp, "tcp"},
+	{Opt_unix, "unix"},
+	{Opt_fd, "fd"},
+	{Opt_legacy, "noextend"},
+	{Opt_nodevmap, "nodevmap"},
+	{Opt_cache_loose, "cache=loose"},
+	{Opt_cache_loose, "loose"},
+	{Opt_err, NULL}
+};
+
+/*
+ *  Parse option string.
+ */
+
+/**
+ * v9fs_parse_options - parse mount options into session structure
+ * @options: options string passed from mount
+ * @v9ses: existing v9fs session information
+ *
+ */
+
+static void v9fs_parse_options(char *options, struct v9fs_session_info *v9ses)
+{
+	char *p;
+	substring_t args[MAX_OPT_ARGS];
+	int option;
+	int ret;
+
+	/* setup defaults */
+	v9ses->port = V9FS_PORT;
+	v9ses->maxdata = 9000;
+	v9ses->proto = PROTO_TCP;
+	v9ses->extended = 1;
+	v9ses->afid = ~0;
+	v9ses->debug = 0;
+	v9ses->rfdno = ~0;
+	v9ses->wfdno = ~0;
+	v9ses->cache = 0;
+
+	if (!options)
+		return;
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		int token;
+		if (!*p)
+			continue;
+		token = match_token(p, tokens, args);
+		if (token < Opt_uname) {
+			if ((ret = match_int(&args[0], &option)) < 0) {
+				dprintk(DEBUG_ERROR,
+					"integer field, but no integer?\n");
+				continue;
+			}
+		}
+		switch (token) {
+		case Opt_port:
+			v9ses->port = option;
+			break;
+		case Opt_msize:
+			v9ses->maxdata = option;
+			break;
+		case Opt_uid:
+			v9ses->uid = option;
+			break;
+		case Opt_gid:
+			v9ses->gid = option;
+			break;
+		case Opt_afid:
+			v9ses->afid = option;
+			break;
+		case Opt_rfdno:
+			v9ses->rfdno = option;
+			break;
+		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_fd:
+			v9ses->proto = PROTO_FD;
+			break;
+		case Opt_uname:
+			match_strcpy(v9ses->name, &args[0]);
+			break;
+		case Opt_remotename:
+			match_strcpy(v9ses->remotename, &args[0]);
+			break;
+		case Opt_legacy:
+			v9ses->extended = 0;
+			break;
+		case Opt_nodevmap:
+			v9ses->nodev = 1;
+			break;
+		case Opt_cache_loose:
+			v9ses->cache = CACHE_LOOSE;
+			break;
+		default:
+			continue;
+		}
+	}
+}
+
+/**
+ * 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
+ * @dev_name: device being mounted
+ * @data: options
+ *
+ */
+
+int
+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;
+
+	v9ses->name = __getname();
+	if (!v9ses->name)
+		return -ENOMEM;
+
+	v9ses->remotename = __getname();
+	if (!v9ses->remotename) {
+		__putname(v9ses->name);
+		return -ENOMEM;
+	}
+
+	strcpy(v9ses->name, V9FS_DEFUSER);
+	strcpy(v9ses->remotename, V9FS_DEFANAME);
+
+	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;
+		break;
+	case PROTO_UNIX:
+		trans_proto = &v9fs_trans_unix;
+		*v9ses->remotename = 0;
+		break;
+	case PROTO_FD:
+		trans_proto = &v9fs_trans_fd;
+		*v9ses->remotename = 0;
+		break;
+	default:
+		printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
+		retval = -ENOPROTOOPT;
+		goto SessCleanUp;
+	};
+
+	v9ses->transport = kmalloc(sizeof(*v9ses->transport), GFP_KERNEL);
+	if (!v9ses->transport) {
+		retval = -ENOMEM;
+		goto SessCleanUp;
+	}
+
+	memmove(v9ses->transport, trans_proto, sizeof(*v9ses->transport));
+
+	if ((retval = v9ses->transport->init(v9ses, dev_name, data)) < 0) {
+		eprintk(KERN_ERR, "problem initializing transport\n");
+		goto SessCleanUp;
+	}
+
+	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;
+	}
+
+	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;
+		}
+
+		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:
+	v9fs_session_close(v9ses);
+	return retval;
+}
+
+/**
+ * v9fs_session_close - shutdown a session
+ * @v9ses: session information structure
+ *
+ */
+
+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;
+	}
+
+	__putname(v9ses->name);
+	__putname(v9ses->remotename);
+}
+
+/**
+ * v9fs_session_cancel - mark transport as disconnected
+ * 	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);
+}
+
+extern int v9fs_error_init(void);
+
+/**
+ * v9fs_init - Initialize module
+ *
+ */
+
+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;
+}
+
+/**
+ * v9fs_init - shutdown module
+ *
+ */
+
+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("Eric Van Hensbergen <ericvh@gmail.com>");
+MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
+MODULE_LICENSE("GPL");

fs/9p/v9fs.h

@@ -0,0 +1,99 @@
+/*
+ * V9FS 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
+ *
+ */
+
+/*
+  * Idpool structure provides lock and id management
+  *
+  */
+
+struct v9fs_idpool {
+	struct semaphore lock;
+	struct idr pool;
+};
+
+/*
+  * Session structure provides information for an opened session
+  *
+  */
+
+struct v9fs_session_info {
+	/* options */
+	unsigned int maxdata;
+	unsigned char extended;	/* set to 1 if we are using UNIX extensions */
+	unsigned char nodev;	/* set to 1 if no disable device mapping */
+	unsigned short port;	/* port to connect to */
+	unsigned short debug;	/* debug level */
+	unsigned short proto;	/* protocol to use */
+	unsigned int afid;	/* authentication fid */
+	unsigned int rfdno;	/* read file descriptor number */
+	unsigned int wfdno;	/* write file descriptor number */
+	unsigned int cache;	/* cache mode */
+
+	char *name;		/* user name to mount as */
+	char *remotename;	/* name of remote hierarchy being mounted */
+	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 dentry *debugfs_dir;
+};
+
+/* possible values of ->proto */
+enum {
+	PROTO_TCP,
+	PROTO_UNIX,
+	PROTO_FD,
+};
+
+/* possible values of ->cache */
+/* eventually support loose, tight, time, session, default always none */
+enum {
+	CACHE_NONE,		/* default */
+	CACHE_LOOSE,		/* no consistency */
+};
+
+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 *);
+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
+
+/* other default globals */
+#define V9FS_PORT		564
+#define V9FS_DEFUSER	"nobody"
+#define V9FS_DEFANAME	""
+

fs/9p/v9fs_vfs.h

@@ -0,0 +1,54 @@
+/*
+ * V9FS VFS extensions.
+ *
+ *  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
+ *
+ */
+
+/* plan9 semantics are that created files are implicitly opened.
+ * But linux semantics are that you call create, then open.
+ * the plan9 approach is superior as it provides an atomic
+ * open.
+ * we track the create fid here. When the file is opened, if fidopen is
+ * non-zero, we use the fid and can skip some steps.
+ * there may be a better way to do this, but I don't know it.
+ * one BAD way is to clunk the fid on create, then open it again:
+ * you lose the atomicity of file open
+ */
+
+/* special case:
+ * unlink calls remove, which is an implicit clunk. So we have to track
+ * that kind of thing so that we don't try to clunk a dead fid.
+ */
+
+extern struct file_system_type v9fs_fs_type;
+extern const struct address_space_operations v9fs_addr_operations;
+extern const struct file_operations v9fs_file_operations;
+extern const struct file_operations v9fs_dir_operations;
+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 *);
+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_dentry_release(struct dentry *);
+int v9fs_uflags2omode(int uflags);

fs/9p/vfs_addr.c

@@ -0,0 +1,109 @@
+/*
+ *  linux/fs/9p/vfs_addr.c
+ *
+ * This file contians vfs address (mmap) ops for 9P2000.
+ *
+ *  Copyright (C) 2005 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/file.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+#include <linux/inet.h>
+#include <linux/pagemap.h>
+#include <linux/idr.h>
+
+#include "debug.h"
+#include "v9fs.h"
+#include "9p.h"
+#include "v9fs_vfs.h"
+#include "fid.h"
+
+/**
+ * v9fs_vfs_readpage - read an entire page in from 9P
+ *
+ * @file: file being read
+ * @page: structure to page
+ *
+ */
+
+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");
+
+	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);
+
+		if (result < rsize)
+			break;
+	} while (count);
+
+	memset(buffer, 0, count);
+	flush_dcache_page(page);
+	SetPageUptodate(page);
+	retval = 0;
+
+UnmapAndUnlock:
+	kunmap(page);
+	unlock_page(page);
+	return retval;
+}
+
+const struct address_space_operations v9fs_addr_operations = {
+      .readpage = v9fs_vfs_readpage,
+};

fs/9p/vfs_dentry.c

@@ -0,0 +1,119 @@
+/*
+ *  linux/fs/9p/vfs_dentry.c
+ *
+ * This file contians vfs dentry ops for the 9P2000 protocol.
+ *
+ *  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/file.h>
+#include <linux/pagemap.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+#include <linux/inet.h>
+#include <linux/namei.h>
+#include <linux/idr.h>
+
+#include "debug.h"
+#include "v9fs.h"
+#include "9p.h"
+#include "v9fs_vfs.h"
+#include "fid.h"
+
+/**
+ * v9fs_dentry_delete - called when dentry refcount equals 0
+ * @dentry:  dentry in question
+ *
+ * By returning 1 here we should remove cacheing of unused
+ * dentry components.
+ *
+ */
+
+static int v9fs_dentry_delete(struct dentry *dentry)
+{
+	dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+
+	return 1;
+}
+
+/**
+ * v9fs_cached_dentry_delete - called when dentry refcount equals 0
+ * @dentry:  dentry in question
+ *
+ * Only return 1 if our inode is invalid.  Only non-synthetic files
+ * (ones without mtime == 0) should be calling this function.
+ *
+ */
+
+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);
+
+	if(!inode)
+		return 1;
+
+	return 0;
+}
+
+/**
+ * v9fs_dentry_release - called when dentry is going to be freed
+ * @dentry:  dentry that is being release
+ *
+ */
+
+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);
+		}
+
+		kfree(dentry->d_fsdata);	/* free the list_head */
+	}
+}
+
+struct dentry_operations v9fs_cached_dentry_operations = {
+	.d_delete = v9fs_cached_dentry_delete,
+	.d_release = v9fs_dentry_release,
+};
+
+struct dentry_operations v9fs_dentry_operations = {
+	.d_delete = v9fs_dentry_delete,
+	.d_release = v9fs_dentry_release,
+};

fs/9p/vfs_dir.c

@@ -0,0 +1,213 @@
+/*
+ * linux/fs/9p/vfs_dir.c
+ *
+ * This file contains vfs directory ops for the 9P2000 protocol.
+ *
+ *  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/file.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+#include <linux/sched.h>
+#include <linux/inet.h>
+#include <linux/idr.h>
+
+#include "debug.h"
+#include "v9fs.h"
+#include "9p.h"
+#include "conv.h"
+#include "v9fs_vfs.h"
+#include "fid.h"
+
+/**
+ * dt_type - return file type
+ * @mistat: mistat structure
+ *
+ */
+
+static inline int dt_type(struct v9fs_stat *mistat)
+{
+	unsigned long perm = mistat->mode;
+	int rettype = DT_REG;
+
+	if (perm & V9FS_DMDIR)
+		rettype = DT_DIR;
+	if (perm & V9FS_DMSYMLINK)
+		rettype = DT_LNK;
+
+	return rettype;
+}
+
+/**
+ * v9fs_dir_readdir - read a directory
+ * @filep: opened file structure
+ * @dirent: directory structure ???
+ * @filldir: function to populate directory structure ???
+ *
+ */
+
+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)
+			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);
+	}
+
+      FreeStructs:
+	kfree(fcall);
+	return ret;
+}
+
+/**
+ * v9fs_dir_release - close a directory
+ * @inode: inode of the directory
+ * @filp: file pointer to a directory
+ *
+ */
+
+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;
+
+	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;
+	}
+
+	return 0;
+}
+
+const struct file_operations v9fs_dir_operations = {
+	.read = generic_read_dir,
+	.readdir = v9fs_dir_readdir,
+	.open = v9fs_file_open,
+	.release = v9fs_dir_release,
+};

fs/9p/vfs_file.c

@@ -0,0 +1,269 @@
+/*
+ *  linux/fs/9p/vfs_file.c
+ *
+ * This file contians vfs file ops for 9P2000.
+ *
+ *  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/file.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+#include <linux/inet.h>
+#include <linux/list.h>
+#include <asm/uaccess.h>
+#include <linux/idr.h>
+
+#include "debug.h"
+#include "v9fs.h"
+#include "9p.h"
+#include "v9fs_vfs.h"
+#include "fid.h"
+
+static const struct file_operations v9fs_cached_file_operations;
+
+/**
+ * v9fs_file_open - open a file (or directory)
+ * @inode: inode to be opened
+ * @file: file being opened
+ *
+ */
+
+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;
+
+	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);
+
+	omode = v9fs_uflags2omode(file->f_flags);
+	err = v9fs_t_open(v9ses, vfid->fid, omode, &fcall);
+	if (err < 0) {
+		PRINT_FCALL_ERROR("open failed", fcall);
+		goto Clunk_Fid;
+	}
+
+	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");
+		/* 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;
+}
+
+/**
+ * v9fs_file_lock - lock a file (or directory)
+ * @inode: inode to be opened
+ * @file: file being opened
+ *
+ * XXX - this looks like a local only lock, we should extend into 9P
+ *       by using open exclusive
+ */
+
+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);
+
+	/* No mandatory locks */
+	if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
+		return -ENOLCK;
+
+	if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
+		filemap_write_and_wait(inode->i_mapping);
+		invalidate_mapping_pages(&inode->i_data, 0, -1);
+	}
+
+	return res;
+}
+
+/**
+ * v9fs_file_read - read from a file
+ * @filep: file pointer to read
+ * @data: data buffer to read data into
+ * @count: size of buffer
+ * @offset: offset at which to read data
+ *
+ */
+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;
+
+		result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall);
+
+		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;
+}
+
+/**
+ * v9fs_file_write - write to a file
+ * @filep: file pointer to write
+ * @data: data buffer to write data from
+ * @count: size of buffer
+ * @offset: offset at which to write data
+ *
+ */
+
+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;
+
+		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;
+		}
+
+		count -= result;
+		data += result;
+		total += result;
+	} while (count);
+
+	invalidate_inode_pages2(inode->i_mapping);
+	return total;
+}
+
+static const struct file_operations v9fs_cached_file_operations = {
+	.llseek = generic_file_llseek,
+	.read = do_sync_read,
+	.aio_read = generic_file_aio_read,
+	.write = v9fs_file_write,
+	.open = v9fs_file_open,
+	.release = v9fs_dir_release,
+	.lock = v9fs_file_lock,
+	.mmap = generic_file_mmap,
+};
+
+const struct file_operations v9fs_file_operations = {
+	.llseek = generic_file_llseek,
+	.read = v9fs_file_read,
+	.write = v9fs_file_write,
+	.open = v9fs_file_open,
+	.release = v9fs_dir_release,
+	.lock = v9fs_file_lock,
+	.mmap = generic_file_mmap,
+};

fs/9p/vfs_super.c

@@ -0,0 +1,278 @@
+/*
+ *  linux/fs/9p/vfs_super.c
+ *
+ * This file contians superblock ops for 9P2000. It is intended that
+ * you mount this file system on directories.
+ *
+ *  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/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+#include <linux/inet.h>
+#include <linux/pagemap.h>
+#include <linux/seq_file.h>
+#include <linux/mount.h>
+#include <linux/idr.h>
+
+#include "debug.h"
+#include "v9fs.h"
+#include "9p.h"
+#include "v9fs_vfs.h"
+#include "fid.h"
+
+static void v9fs_clear_inode(struct inode *);
+static const struct super_operations v9fs_super_ops;
+
+/**
+ * v9fs_clear_inode - release an inode
+ * @inode: inode to release
+ *
+ */
+
+static void v9fs_clear_inode(struct inode *inode)
+{
+	filemap_fdatawrite(inode->i_mapping);
+}
+
+/**
+ * v9fs_set_super - set the superblock
+ * @s: super block
+ * @data: file system specific data
+ *
+ */
+
+static int v9fs_set_super(struct super_block *s, void *data)
+{
+	s->s_fs_info = data;
+	return set_anon_super(s, data);
+}
+
+/**
+ * v9fs_fill_super - populate superblock with info
+ * @sb: superblock
+ * @v9ses: session information
+ *
+ */
+
+static void
+v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
+		int flags)
+{
+	sb->s_maxbytes = MAX_LFS_FILESIZE;
+	sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
+	sb->s_blocksize = 1 << sb->s_blocksize_bits;
+	sb->s_magic = V9FS_MAGIC;
+	sb->s_op = &v9fs_super_ops;
+
+	sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
+	    MS_NOATIME;
+}
+
+/**
+ * v9fs_get_sb - mount a superblock
+ * @fs_type: file system type
+ * @flags: mount flags
+ * @dev_name: device name that was mounted
+ * @data: mount options
+ * @mnt: mountpoint record to be instantiated
+ *
+ */
+
+static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
+		       const char *dev_name, void *data,
+		       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;
+	int mode = S_IRWXUGO | S_ISVTX;
+	uid_t uid = current->fsuid;
+	gid_t gid = current->fsgid;
+	int stat_result = 0;
+	int newfid = 0;
+	int retval = 0;
+
+	dprintk(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;
+	}
+
+	sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
+	if (IS_ERR(sb)) {
+		retval = PTR_ERR(sb);
+		goto out_close_session;
+	}
+	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;
+	}
+
+	inode->i_uid = uid;
+	inode->i_gid = gid;
+
+	root = d_alloc_root(inode);
+	if (!root) {
+		retval = -ENOMEM;
+		goto put_back_sb;
+	}
+
+	sb->s_root = root;
+
+	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);
+	}
+
+	kfree(fcall);
+
+	if (stat_result < 0) {
+		retval = stat_result;
+		goto put_back_sb;
+	}
+
+	return simple_set_mnt(mnt, sb);
+
+out_close_session:
+	v9fs_session_close(v9ses);
+out_free_session:
+	kfree(v9ses);
+	return retval;
+
+put_back_sb:
+	/* deactivate_super calls v9fs_kill_super which will frees the rest */
+	up_write(&sb->s_umount);
+	deactivate_super(sb);
+	return retval;
+}
+
+/**
+ * v9fs_kill_super - Kill Superblock
+ * @s: superblock
+ *
+ */
+
+static void v9fs_kill_super(struct super_block *s)
+{
+	struct v9fs_session_info *v9ses = s->s_fs_info;
+
+	dprintk(DEBUG_VFS, " %p\n", s);
+
+	v9fs_dentry_release(s->s_root);	/* clunk root */
+
+	kill_anon_super(s);
+
+	v9fs_session_close(v9ses);
+	kfree(v9ses);
+	dprintk(DEBUG_VFS, "exiting kill_super\n");
+}
+
+/**
+ * v9fs_show_options - Show mount options in /proc/mounts
+ * @m: seq_file to write to
+ * @mnt: mount descriptor
+ *
+ */
+
+static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt)
+{
+	struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info;
+
+	if (v9ses->debug != 0)
+		seq_printf(m, ",debug=%u", v9ses->debug);
+	if (v9ses->port != V9FS_PORT)
+		seq_printf(m, ",port=%u", v9ses->port);
+	if (v9ses->maxdata != 9000)
+		seq_printf(m, ",msize=%u", v9ses->maxdata);
+	if (v9ses->afid != ~0)
+		seq_printf(m, ",afid=%u", v9ses->afid);
+	if (v9ses->proto == PROTO_UNIX)
+		seq_puts(m, ",proto=unix");
+	if (v9ses->extended == 0)
+		seq_puts(m, ",noextend");
+	if (v9ses->nodev == 1)
+		seq_puts(m, ",nodevmap");
+	seq_printf(m, ",name=%s", v9ses->name);
+	seq_printf(m, ",aname=%s", v9ses->remotename);
+	seq_printf(m, ",uid=%u", v9ses->uid);
+	seq_printf(m, ",gid=%u", v9ses->gid);
+	return 0;
+}
+
+static void
+v9fs_umount_begin(struct vfsmount *vfsmnt, int flags)
+{
+	struct v9fs_session_info *v9ses = vfsmnt->mnt_sb->s_fs_info;
+
+	if (flags & MNT_FORCE)
+		v9fs_session_cancel(v9ses);
+}
+
+static const struct super_operations v9fs_super_ops = {
+	.statfs = simple_statfs,
+	.clear_inode = v9fs_clear_inode,
+	.show_options = v9fs_show_options,
+	.umount_begin = v9fs_umount_begin,
+};
+
+struct file_system_type v9fs_fs_type = {
+	.name = "9p",
+	.get_sb = v9fs_get_sb,
+	.kill_sb = v9fs_kill_super,
+	.owner = THIS_MODULE,
+};