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Subject[RFC][PATCH 5/7] v9fs: 9P protocol implementation (2.0-rc7)
This is part [5/7] of the v9fs-2.0-rc7 patch against Linux 2.6.

This part of the patch contains the 9P protocol functions.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

----------

9p.c | 359 ++++++++++++++++++++++++++++++++
9p.h | 339 ++++++++++++++++++++++++++++++
conv.c | 729 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
conv.h | 35 +++
4 files changed, 1462 insertions(+)

----------

Index: fs/9p/9p.h
===================================================================
--- /dev/null (tree:3c5e9440c6a37c3355b50608836a23c8fa4eec99)
+++ 7d6ca5270f0ecf9306a944a3d39897a97dc9f67f/fs/9p/9p.h (mode:100644)
@@ -0,0 +1,339 @@
+/*
+ * linux/fs/9p/9p.h
+ *
+ * 9P protocol 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 as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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,
+};
+
+/* ample room for Twrite/Rread header (iounit) */
+#define V9FS_IOHDRSZ 24
+
+/* qids are the unique ID for a file (like an inode */
+struct v9fs_qid {
+ u8 type;
+ u32 version;
+ uint64_t 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;
+ uint64_t 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 */
+ char data[0];
+};
+
+/* Structures for Protocol Operations */
+
+struct Tversion {
+ u32 msize;
+ char *version;
+};
+
+struct Rversion {
+ u32 msize;
+ char *version;
+};
+
+struct Tauth {
+ u32 afid;
+ char *uname;
+ char *aname;
+};
+
+struct Rauth {
+ struct v9fs_qid qid;
+};
+
+struct Rerror {
+ char *error;
+ u32 errno; /* 9p2000.u extension */
+};
+
+struct Tflush {
+ u32 oldtag;
+};
+
+struct Rflush {
+};
+
+struct Tattach {
+ u32 fid;
+ u32 afid;
+ char *uname;
+ char *aname;
+};
+
+struct Rattach {
+ struct v9fs_qid qid;
+};
+
+struct Twalk {
+ u32 fid;
+ u32 newfid;
+ u32 nwname;
+ char **wnames;
+};
+
+struct Rwalk {
+ u32 nwqid;
+ struct v9fs_qid *wqids;
+};
+
+struct Topen {
+ u32 fid;
+ u8 mode;
+};
+
+struct Ropen {
+ struct v9fs_qid qid;
+ u32 iounit;
+};
+
+struct Tcreate {
+ u32 fid;
+ char *name;
+ u32 perm;
+ u8 mode;
+};
+
+struct Rcreate {
+ struct v9fs_qid qid;
+ u32 iounit;
+};
+
+struct Tread {
+ u32 fid;
+ uint64_t offset;
+ u32 count;
+};
+
+struct Rread {
+ u32 count;
+ u8 *data;
+};
+
+struct Twrite {
+ u32 fid;
+ uint64_t 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;
+
+ 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 FCALL_ERROR(fcall) (fcall ? fcall->params.rerror.error : "")
+
+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,
+ struct v9fs_fcall **rcall);
+
+int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 oldtag);
+
+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_stat *stat, 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, struct v9fs_fcall **rcall);
+
+int v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid,
+ uint64_t offset, u32 count, struct v9fs_fcall **rcall);
+
+int v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid, uint64_t offset,
+ u32 count, void *data, struct v9fs_fcall **rcall);
Index: fs/9p/9p.c
===================================================================
--- /dev/null (tree:3c5e9440c6a37c3355b50608836a23c8fa4eec99)
+++ 7d6ca5270f0ecf9306a944a3d39897a97dc9f67f/fs/9p/9p.c (mode:100644)
@@ -0,0 +1,359 @@
+/*
+ * linux/fs/9p/9p.c
+ *
+ * This file contains functions 9P2000 functions
+ *
+ * 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 as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+
+#include "debug.h"
+#include "idpool.h"
+#include "v9fs.h"
+#include "9p.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 **fcall)
+{
+ struct v9fs_fcall msg;
+
+ dprintk(DEBUG_9P, "msize: %d version: %s\n", msize, version);
+ msg.id = TVERSION;
+ msg.params.tversion.msize = msize;
+ msg.params.tversion.version = version;
+
+ return v9fs_mux_rpc(v9ses, &msg, fcall);
+}
+
+/**
+ * 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 **fcall)
+{
+ struct v9fs_fcall msg;
+
+ dprintk(DEBUG_9P, "uname '%s' aname '%s' fid %d afid %d\n", uname,
+ aname, fid, afid);
+ msg.id = TATTACH;
+ msg.params.tattach.fid = fid;
+ msg.params.tattach.afid = afid;
+ msg.params.tattach.uname = uname;
+ msg.params.tattach.aname = aname;
+
+ return v9fs_mux_rpc(v9ses, &msg, fcall);
+}
+
+/**
+ * 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,
+ struct v9fs_fcall **fcall)
+{
+ struct v9fs_fcall msg;
+
+ dprintk(DEBUG_9P, "fid %d\n", fid);
+ msg.id = TCLUNK;
+ msg.params.tclunk.fid = fid;
+
+ return v9fs_mux_rpc(v9ses, &msg, fcall);
+}
+
+/**
+ * v9fs_v9fs_t_flush - flush a pending transaction
+ * @v9ses: 9P2000 session information
+ * @tag: tid to release
+ *
+ */
+
+int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 tag)
+{
+ struct v9fs_fcall msg;
+
+ dprintk(DEBUG_9P, "oldtag %d\n", tag);
+ msg.id = TFLUSH;
+ msg.params.tflush.oldtag = tag;
+ return v9fs_mux_rpc(v9ses, &msg, NULL);
+}
+
+/**
+ * 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 **fcall)
+{
+ struct v9fs_fcall msg;
+
+ dprintk(DEBUG_9P, "fid %d\n", fid);
+ if (fcall)
+ *fcall = NULL;
+
+ msg.id = TSTAT;
+ msg.params.tstat.fid = fid;
+ return v9fs_mux_rpc(v9ses, &msg, fcall);
+}
+
+/**
+ * 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_stat *stat, struct v9fs_fcall **fcall)
+{
+ struct v9fs_fcall msg;
+
+ dprintk(DEBUG_9P, "fid %d length %d\n", fid, (int)stat->length);
+ msg.id = TWSTAT;
+ msg.params.twstat.fid = fid;
+ msg.params.twstat.stat = stat;
+
+ return v9fs_mux_rpc(v9ses, &msg, fcall);
+}
+
+/**
+ * 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 **fcall)
+{
+ struct v9fs_fcall msg;
+
+ dprintk(DEBUG_9P, "fid %d newfid %d wname '%s'\n", fid, newfid, name);
+ msg.id = TWALK;
+ msg.params.twalk.fid = fid;
+ msg.params.twalk.newfid = newfid;
+
+ if (name) {
+ msg.params.twalk.nwname = 1;
+ msg.params.twalk.wnames = &name;
+ } else {
+ msg.params.twalk.nwname = 0;
+ }
+
+ return v9fs_mux_rpc(v9ses, &msg, fcall);
+}
+
+/**
+ * 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 **fcall)
+{
+ struct v9fs_fcall msg;
+ long errorno = -1;
+
+ dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode);
+ msg.id = TOPEN;
+ msg.params.topen.fid = fid;
+ msg.params.topen.mode = mode;
+
+ errorno = v9fs_mux_rpc(v9ses, &msg, fcall);
+
+ return errorno;
+}
+
+/**
+ * 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 **fcall)
+{
+ struct v9fs_fcall msg;
+
+ dprintk(DEBUG_9P, "fid %d\n", fid);
+ msg.id = TREMOVE;
+ msg.params.tremove.fid = fid;
+ return v9fs_mux_rpc(v9ses, &msg, fcall);
+}
+
+/**
+ * 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, struct v9fs_fcall **fcall)
+{
+ struct v9fs_fcall msg;
+
+ dprintk(DEBUG_9P, "fid %d name '%s' perm %x mode %d\n",
+ fid, name, perm, mode);
+
+ msg.id = TCREATE;
+ msg.params.tcreate.fid = fid;
+ msg.params.tcreate.name = name;
+ msg.params.tcreate.perm = perm;
+ msg.params.tcreate.mode = mode;
+
+ return v9fs_mux_rpc(v9ses, &msg, fcall);
+}
+
+/**
+ * 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, uint64_t offset,
+ u32 count, struct v9fs_fcall **fcall)
+{
+ struct v9fs_fcall msg;
+ struct v9fs_fcall *rc = NULL;
+ long errorno = -1;
+
+ dprintk(DEBUG_9P, "fid %d offset 0x%lx count 0x%x\n", fid,
+ (long unsigned int)offset, count);
+ msg.id = TREAD;
+ msg.params.tread.fid = fid;
+ msg.params.tread.offset = offset;
+ msg.params.tread.count = count;
+ errorno = v9fs_mux_rpc(v9ses, &msg, &rc);
+
+ if (!errorno) {
+ errorno = rc->params.rread.count;
+ dump_data(rc->params.rread.data, rc->params.rread.count);
+ }
+
+ if (fcall)
+ *fcall = rc;
+ else
+ kfree( rc);
+
+ return errorno;
+}
+
+/**
+ * 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,
+ uint64_t offset, u32 count, void *data,
+ struct v9fs_fcall **fcall)
+{
+ struct v9fs_fcall msg;
+ struct v9fs_fcall *rc = NULL;
+ long errorno = -1;
+
+ dprintk(DEBUG_9P, "fid %d offset 0x%llx count 0x%x\n", fid,
+ (unsigned long long)offset, count);
+ dump_data(data, count);
+
+ msg.id = TWRITE;
+ msg.params.twrite.fid = fid;
+ msg.params.twrite.offset = offset;
+ msg.params.twrite.count = count;
+ msg.params.twrite.data = data;
+
+ errorno = v9fs_mux_rpc(v9ses, &msg, &rc);
+
+ if (!errorno)
+ errorno = rc->params.rwrite.count;
+
+ if (fcall)
+ *fcall = rc;
+ else
+ kfree( rc);
+
+ return errorno;
+}
Index: fs/9p/conv.h
===================================================================
--- /dev/null (tree:3c5e9440c6a37c3355b50608836a23c8fa4eec99)
+++ 7d6ca5270f0ecf9306a944a3d39897a97dc9f67f/fs/9p/conv.h (mode:100644)
@@ -0,0 +1,35 @@
+/*
+ * linux/fs/9p/conv.h
+ *
+ * 9P protocol conversion 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 as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+int v9fs_deserialize_stat(struct v9fs_session_info *, void *buf,
+ u32 buflen, struct v9fs_stat *stat,
+ u32 statlen);
+int v9fs_serialize_fcall(struct v9fs_session_info *, struct v9fs_fcall *tcall,
+ void *buf, u32 buflen);
+int v9fs_deserialize_fcall(struct v9fs_session_info *, u32 msglen,
+ void *buf, u32 buflen, struct v9fs_fcall *rcall,
+ int rcalllen);
+
+/* this one is actually in error.c right now */
+int v9fs_errstr2errno(char *errstr);
Index: fs/9p/conv.c
===================================================================
--- /dev/null (tree:3c5e9440c6a37c3355b50608836a23c8fa4eec99)
+++ 7d6ca5270f0ecf9306a944a3d39897a97dc9f67f/fs/9p/conv.c (mode:100644)
@@ -0,0 +1,729 @@
+/*
+ * linux/fs/9p/conv.c
+ *
+ * 9P protocol conversion functions
+ *
+ * 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 as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+
+#include "debug.h"
+#include "idpool.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;
+}
+
+#define buf_check_sizep(buf, len) \
+ if (buf->p+len > buf->ep) { \
+ if (buf->p < buf->ep) { \
+ eprintk(KERN_ERR, "buffer overflow\n"); \
+ buf->p = buf->ep + 1; \
+ } \
+ return NULL; \
+ } \
+
+
+#define buf_check_size(buf, len) \
+ if (buf->p+len > buf->ep) { \
+ if (buf->p < buf->ep) { \
+ eprintk(KERN_ERR, "buffer overflow\n"); \
+ buf->p = buf->ep + 1; \
+ } \
+ return 0; \
+ } \
+
+#define buf_check_sizev(buf, len) \
+ if (buf->p+len > buf->ep) { \
+ if (buf->p < buf->ep) { \
+ eprintk(KERN_ERR, "buffer overflow\n"); \
+ buf->p = buf->ep + 1; \
+ } \
+ return; \
+ } \
+
+static inline void *buf_alloc(struct cbuf *buf, int len)
+{
+ void *ret = NULL;
+
+ buf_check_sizep(buf, len);
+ ret = buf->p;
+ buf->p += len;
+
+ return ret;
+}
+
+static inline void buf_put_int8(struct cbuf *buf, u8 val)
+{
+ buf_check_sizev(buf, 1);
+
+ buf->p[0] = val;
+ buf->p++;
+}
+
+static inline void buf_put_int16(struct cbuf *buf, u16 val)
+{
+ buf_check_sizev(buf, 2);
+
+ buf->p[0] = val;
+ buf->p[1] = val >> 8;
+ buf->p += 2;
+}
+
+static inline void buf_put_int32(struct cbuf *buf, u32 val)
+{
+ buf_check_sizev(buf, 2);
+
+ buf->p[0] = val;
+ buf->p[1] = val >> 8;
+ buf->p[2] = val >> 16;
+ buf->p[3] = val >> 24;
+ buf->p += 4;
+}
+
+static inline void buf_put_int64(struct cbuf *buf, uint64_t val)
+{
+ buf_check_sizev(buf, 8);
+
+ buf->p[0] = val;
+ buf->p[1] = val >> 8;
+ buf->p[2] = val >> 16;
+ buf->p[3] = val >> 24;
+ buf->p[4] = val >> 32;
+ buf->p[5] = val >> 40;
+ buf->p[6] = val >> 48;
+ buf->p[7] = val >> 56;
+ buf->p += 8;
+}
+
+static inline void
+buf_put_stringn(struct cbuf *buf, const char *s, u16 slen)
+{
+ buf_check_sizev(buf, slen + 2);
+
+ buf_put_int16(buf, slen);
+ memcpy(buf->p, s, slen);
+ buf->p += slen;
+}
+
+static inline void buf_put_string(struct cbuf *buf, const char *s)
+{
+ buf_put_stringn(buf, s, strlen(s));
+}
+
+static inline void buf_put_data(struct cbuf *buf, void *data, u32 datalen)
+{
+ buf_check_sizev(buf, datalen);
+
+ memcpy(buf->p, data, datalen);
+ buf->p += datalen;
+}
+
+static inline u8 buf_get_int8(struct cbuf *buf)
+{
+ u8 ret = 0;
+
+ buf_check_size(buf, 1);
+ ret = buf->p[0];
+
+ buf->p++;
+
+ return ret;
+}
+
+static inline u16 buf_get_int16(struct cbuf *buf)
+{
+ u16 ret = 0;
+
+ buf_check_size(buf, 2);
+ ret = buf->p[0] | (buf->p[1] << 8);
+
+ buf->p += 2;
+
+ return ret;
+}
+
+static inline u32 buf_get_int32(struct cbuf *buf)
+{
+ u32 ret = 0;
+
+ buf_check_size(buf, 4);
+ ret =
+ buf->p[0] | (buf->p[1] << 8) | (buf->p[2] << 16) | (buf->
+ p[3] << 24);
+
+ buf->p += 4;
+
+ return ret;
+}
+
+static inline uint64_t buf_get_int64(struct cbuf *buf)
+{
+ uint64_t ret = 0;
+
+ buf_check_size(buf, 8);
+ ret = (uint64_t) buf->p[0] | ((uint64_t) buf->p[1] << 8) |
+ ((uint64_t) buf->p[2] << 16) | ((uint64_t) buf->p[3] << 24) |
+ ((uint64_t) buf->p[4] << 32) | ((uint64_t) buf->p[5] << 40) |
+ ((uint64_t) buf->p[6] << 48) | ((uint64_t) buf->p[7] << 56);
+
+ buf->p += 8;
+
+ return ret;
+}
+
+static inline int
+buf_get_string(struct cbuf *buf, char *data, unsigned int datalen)
+{
+
+ u16 len = buf_get_int16(buf);
+ buf_check_size(buf, len);
+ if (len + 1 > datalen)
+ return 0;
+
+ memcpy(data, buf->p, len);
+ data[len] = 0;
+ buf->p += len;
+
+ return len + 1;
+}
+
+static inline char *buf_get_stringb(struct cbuf *buf, struct cbuf *sbuf)
+{
+ char *ret = NULL;
+ int n = buf_get_string(buf, sbuf->p, sbuf->ep - sbuf->p);
+
+ if (n > 0) {
+ ret = sbuf->p;
+ sbuf->p += n;
+ }
+
+ return ret;
+}
+
+static inline int buf_get_data(struct cbuf *buf, void *data, int datalen)
+{
+ buf_check_size(buf, datalen);
+
+ memcpy(data, buf->p, datalen);
+ buf->p += datalen;
+
+ return datalen;
+}
+
+static inline void *buf_get_datab(struct cbuf *buf, struct cbuf *dbuf,
+ int datalen)
+{
+ char *ret = NULL;
+ int n = 0;
+
+ buf_check_sizep(dbuf, datalen);
+
+ n = buf_get_data(buf, dbuf->p, datalen);
+
+ if (n > 0) {
+ ret = dbuf->p;
+ dbuf->p += n;
+ }
+
+ return ret;
+}
+
+/**
+ * v9fs_size_stat - calculate the size of a variable length stat struct
+ * @v9ses: session information
+ * @stat: metadata (stat) structure
+ *
+ */
+
+static int v9fs_size_stat(struct v9fs_session_info *v9ses,
+ struct v9fs_stat *stat)
+{
+ int size = 0;
+
+ if (stat == 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 (stat->name)
+ size += strlen(stat->name);
+ if (stat->uid)
+ size += strlen(stat->uid);
+ if (stat->gid)
+ size += strlen(stat->gid);
+ if (stat->muid)
+ size += strlen(stat->muid);
+
+ if (v9ses->extended) {
+ size += 4 + /* n_uid[4] */
+ 4 + /* n_gid[4] */
+ 4 + /* n_muid[4] */
+ 2; /* string length of extension[4] */
+ if (stat->extension)
+ size += strlen(stat->extension);
+ }
+
+ return size;
+}
+
+/**
+ * serialize_stat - safely format a stat structure for transmission
+ * @v9ses: session info
+ * @stat: metadata (stat) structure
+ * @bufp: buffer to serialize structure into
+ *
+ */
+
+static int
+serialize_stat(struct v9fs_session_info *v9ses, struct v9fs_stat *stat,
+ struct cbuf *bufp)
+{
+ buf_put_int16(bufp, stat->size);
+ buf_put_int16(bufp, stat->type);
+ buf_put_int32(bufp, stat->dev);
+ buf_put_int8(bufp, stat->qid.type);
+ buf_put_int32(bufp, stat->qid.version);
+ buf_put_int64(bufp, stat->qid.path);
+ buf_put_int32(bufp, stat->mode);
+ buf_put_int32(bufp, stat->atime);
+ buf_put_int32(bufp, stat->mtime);
+ buf_put_int64(bufp, stat->length);
+
+ buf_put_string(bufp, stat->name);
+ buf_put_string(bufp, stat->uid);
+ buf_put_string(bufp, stat->gid);
+ buf_put_string(bufp, stat->muid);
+
+ if (v9ses->extended) {
+ buf_put_string(bufp, stat->extension);
+ buf_put_int32(bufp, stat->n_uid);
+ buf_put_int32(bufp, stat->n_gid);
+ buf_put_int32(bufp, stat->n_muid);
+ }
+
+ if (buf_check_overflow(bufp))
+ return 0;
+
+ return stat->size;
+}
+
+/**
+ * deserialize_stat - safely decode a recieved metadata (stat) structure
+ * @v9ses: session info
+ * @bufp: buffer to deserialize
+ * @stat: metadata (stat) structure
+ * @dbufp: buffer to deserialize variable strings into
+ *
+ */
+
+static inline int
+deserialize_stat(struct v9fs_session_info *v9ses, struct cbuf *bufp,
+ struct v9fs_stat *stat, struct cbuf *dbufp)
+{
+
+ 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);
+ stat->name = buf_get_stringb(bufp, dbufp);
+ stat->uid = buf_get_stringb(bufp, dbufp);
+ stat->gid = buf_get_stringb(bufp, dbufp);
+ stat->muid = buf_get_stringb(bufp, dbufp);
+
+ if (v9ses->extended) {
+ stat->extension = buf_get_stringb(bufp, dbufp);
+ stat->n_uid = buf_get_int32(bufp);
+ stat->n_gid = buf_get_int32(bufp);
+ stat->n_muid = buf_get_int32(bufp);
+ }
+
+ if (buf_check_overflow(bufp) || buf_check_overflow(dbufp))
+ return 0;
+
+ return stat->size + 2;
+}
+
+/**
+ * deserialize_statb - wrapper for decoding a received metadata structure
+ * @v9ses: session info
+ * @bufp: buffer to deserialize
+ * @dbufp: buffer to deserialize variable strings into
+ *
+ */
+
+static inline struct v9fs_stat *deserialize_statb(struct v9fs_session_info
+ *v9ses, struct cbuf *bufp,
+ struct cbuf *dbufp)
+{
+ struct v9fs_stat *ret = buf_alloc(dbufp, sizeof(struct v9fs_stat));
+
+ if (ret) {
+ int n = deserialize_stat(v9ses, bufp, ret, dbufp);
+ if (n <= 0)
+ return NULL;
+ }
+
+ return ret;
+}
+
+/**
+ * v9fs_deserialize_stat - decode a received metadata structure
+ * @v9ses: session info
+ * @buf: buffer to deserialize
+ * @buflen: length of received buffer
+ * @stat: metadata structure to decode into
+ * @statlen: length of destination metadata structure
+ *
+ */
+
+int
+v9fs_deserialize_stat(struct v9fs_session_info *v9ses, void *buf,
+ u32 buflen, struct v9fs_stat *stat, u32 statlen)
+{
+ struct cbuf buffer;
+ struct cbuf *bufp = &buffer;
+ struct cbuf dbuffer;
+ struct cbuf *dbufp = &dbuffer;
+
+ buf_init(bufp, buf, buflen);
+ buf_init(dbufp, (char *)stat + sizeof(struct v9fs_stat),
+ statlen - sizeof(struct v9fs_stat));
+
+ return deserialize_stat(v9ses, bufp, stat, dbufp);
+}
+
+static inline int
+v9fs_size_fcall(struct v9fs_session_info *v9ses, struct v9fs_fcall *fcall)
+{
+ int size = 4 + 1 + 2; /* size[4] msg[1] tag[2] */
+ int i = 0;
+
+ switch (fcall->id) {
+ default:
+ eprintk(KERN_ERR, "bad msg type %d\n", fcall->id);
+ return 0;
+ case TVERSION: /* msize[4] version[s] */
+ size += 4 + 2 + strlen(fcall->params.tversion.version);
+ break;
+ case TAUTH: /* afid[4] uname[s] aname[s] */
+ size += 4 + 2 + strlen(fcall->params.tauth.uname) +
+ 2 + strlen(fcall->params.tauth.aname);
+ break;
+ case TFLUSH: /* oldtag[2] */
+ size += 2;
+ break;
+ case TATTACH: /* fid[4] afid[4] uname[s] aname[s] */
+ size += 4 + 4 + 2 + strlen(fcall->params.tattach.uname) +
+ 2 + strlen(fcall->params.tattach.aname);
+ break;
+ case TWALK: /* fid[4] newfid[4] nwname[2] nwname*(wname[s]) */
+ size += 4 + 4 + 2;
+ /* now compute total for the array of names */
+ for (i = 0; i < fcall->params.twalk.nwname; i++)
+ size += 2 + strlen(fcall->params.twalk.wnames[i]);
+ break;
+ case TOPEN: /* fid[4] mode[1] */
+ size += 4 + 1;
+ break;
+ case TCREATE: /* fid[4] name[s] perm[4] mode[1] */
+ size += 4 + 2 + strlen(fcall->params.tcreate.name) + 4 + 1;
+ break;
+ case TREAD: /* fid[4] offset[8] count[4] */
+ size += 4 + 8 + 4;
+ break;
+ case TWRITE: /* fid[4] offset[8] count[4] data[count] */
+ size += 4 + 8 + 4 + fcall->params.twrite.count;
+ break;
+ case TCLUNK: /* fid[4] */
+ size += 4;
+ break;
+ case TREMOVE: /* fid[4] */
+ size += 4;
+ break;
+ case TSTAT: /* fid[4] */
+ size += 4;
+ break;
+ case TWSTAT: /* fid[4] stat[n] */
+ fcall->params.twstat.stat->size =
+ v9fs_size_stat(v9ses, fcall->params.twstat.stat);
+ size += 4 + 2 + 2 + fcall->params.twstat.stat->size;
+ }
+ return size;
+}
+
+/*
+ * v9fs_serialize_fcall - marshall fcall struct into a packet
+ * @v9ses: session information
+ * @fcall: structure to convert
+ * @data: buffer to serialize fcall into
+ * @datalen: length of buffer to serialize fcall into
+ *
+ */
+
+int
+v9fs_serialize_fcall(struct v9fs_session_info *v9ses, struct v9fs_fcall *fcall,
+ void *data, u32 datalen)
+{
+ int i = 0;
+ struct v9fs_stat *stat = NULL;
+ struct cbuf buffer;
+ struct cbuf *bufp = &buffer;
+
+ buf_init(bufp, data, datalen);
+
+ if (!fcall) {
+ eprintk(KERN_ERR, "no fcall\n");
+ return 0;
+ }
+
+ fcall->size = v9fs_size_fcall(v9ses, fcall);
+
+ buf_put_int32(bufp, fcall->size);
+ buf_put_int8(bufp, fcall->id);
+ buf_put_int16(bufp, fcall->tag);
+
+ dprintk(DEBUG_CONV, "size %d id %d tag %d\n", fcall->size, fcall->id,
+ fcall->tag);
+
+ /* now encode it */
+ switch (fcall->id) {
+ default:
+ eprintk(KERN_ERR, "bad msg type: %d\n", fcall->id);
+ return 0;
+ case TVERSION:
+ buf_put_int32(bufp, fcall->params.tversion.msize);
+ buf_put_string(bufp, fcall->params.tversion.version);
+ break;
+ case TAUTH:
+ buf_put_int32(bufp, fcall->params.tauth.afid);
+ buf_put_string(bufp, fcall->params.tauth.uname);
+ buf_put_string(bufp, fcall->params.tauth.aname);
+ break;
+ case TFLUSH:
+ buf_put_int16(bufp, fcall->params.tflush.oldtag);
+ break;
+ case TATTACH:
+ buf_put_int32(bufp, fcall->params.tattach.fid);
+ buf_put_int32(bufp, fcall->params.tattach.afid);
+ buf_put_string(bufp, fcall->params.tattach.uname);
+ buf_put_string(bufp, fcall->params.tattach.aname);
+ break;
+ case TWALK:
+ buf_put_int32(bufp, fcall->params.twalk.fid);
+ buf_put_int32(bufp, fcall->params.twalk.newfid);
+ buf_put_int16(bufp, fcall->params.twalk.nwname);
+ for (i = 0; i < fcall->params.twalk.nwname; i++)
+ buf_put_string(bufp, fcall->params.twalk.wnames[i]);
+ break;
+ case TOPEN:
+ buf_put_int32(bufp, fcall->params.topen.fid);
+ buf_put_int8(bufp, fcall->params.topen.mode);
+ break;
+ case TCREATE:
+ buf_put_int32(bufp, fcall->params.tcreate.fid);
+ buf_put_string(bufp, fcall->params.tcreate.name);
+ buf_put_int32(bufp, fcall->params.tcreate.perm);
+ buf_put_int8(bufp, fcall->params.tcreate.mode);
+ break;
+ case TREAD:
+ buf_put_int32(bufp, fcall->params.tread.fid);
+ buf_put_int64(bufp, fcall->params.tread.offset);
+ buf_put_int32(bufp, fcall->params.tread.count);
+ break;
+ case TWRITE:
+ buf_put_int32(bufp, fcall->params.twrite.fid);
+ buf_put_int64(bufp, fcall->params.twrite.offset);
+ buf_put_int32(bufp, fcall->params.twrite.count);
+ buf_put_data(bufp, fcall->params.twrite.data,
+ fcall->params.twrite.count);
+ break;
+ case TCLUNK:
+ buf_put_int32(bufp, fcall->params.tclunk.fid);
+ break;
+ case TREMOVE:
+ buf_put_int32(bufp, fcall->params.tremove.fid);
+ break;
+ case TSTAT:
+ buf_put_int32(bufp, fcall->params.tstat.fid);
+ break;
+ case TWSTAT:
+ buf_put_int32(bufp, fcall->params.twstat.fid);
+ stat = fcall->params.twstat.stat;
+
+ buf_put_int16(bufp, stat->size + 2);
+ serialize_stat(v9ses, stat, bufp);
+ break;
+ }
+
+ if (buf_check_overflow(bufp))
+ return 0;
+
+ return fcall->size;
+}
+
+/**
+ * deserialize_fcall - unmarshal a response
+ * @v9ses: session information
+ * @msgsize: size of rcall message
+ * @buf: recieved buffer
+ * @buflen: length of received buffer
+ * @rcall: fcall structure to populate
+ * @rcalllen: length of fcall structure to populate
+ *
+ */
+
+int
+v9fs_deserialize_fcall(struct v9fs_session_info *v9ses, u32 msgsize,
+ void *buf, u32 buflen, struct v9fs_fcall *rcall,
+ int rcalllen)
+{
+
+ struct cbuf buffer;
+ struct cbuf *bufp = &buffer;
+ struct cbuf dbuffer;
+ struct cbuf *dbufp = &dbuffer;
+ int i = 0;
+
+ buf_init(bufp, buf, buflen);
+ buf_init(dbufp, (char *)rcall + sizeof(struct v9fs_fcall),
+ rcalllen - sizeof(struct v9fs_fcall));
+
+ rcall->size = msgsize;
+ 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 0;
+ case RVERSION:
+ rcall->params.rversion.msize = buf_get_int32(bufp);
+ rcall->params.rversion.version = buf_get_stringb(bufp, dbufp);
+ 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);
+ rcall->params.rwalk.wqids = buf_alloc(bufp,
+ rcall->params.rwalk.
+ nwqid *
+ sizeof(struct v9fs_qid));
+ if (rcall->params.rwalk.wqids)
+ for (i = 0; i < rcall->params.rwalk.nwqid; i++) {
+ rcall->params.rwalk.wqids[i].type =
+ buf_get_int8(bufp);
+ rcall->params.rwalk.wqids[i].version =
+ buf_get_int16(bufp);
+ rcall->params.rwalk.wqids[i].path =
+ buf_get_int64(bufp);
+ }
+ break;
+ case ROPEN:
+ rcall->params.ropen.qid.type = buf_get_int8(bufp);
+ rcall->params.ropen.qid.version = buf_get_int32(bufp);
+ rcall->params.ropen.qid.path = buf_get_int64(bufp);
+ rcall->params.ropen.iounit = buf_get_int32(bufp);
+ break;
+ case RCREATE:
+ rcall->params.rcreate.qid.type = buf_get_int8(bufp);
+ rcall->params.rcreate.qid.version = buf_get_int32(bufp);
+ rcall->params.rcreate.qid.path = buf_get_int64(bufp);
+ rcall->params.rcreate.iounit = buf_get_int32(bufp);
+ break;
+ case RREAD:
+ rcall->params.rread.count = buf_get_int32(bufp);
+ rcall->params.rread.data = buf_get_datab(bufp, dbufp,
+ 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);
+ rcall->params.rstat.stat =
+ deserialize_statb(v9ses, bufp, dbufp);
+ break;
+ case RWSTAT:
+ break;
+ case RERROR:
+ rcall->params.rerror.error = buf_get_stringb(bufp, dbufp);
+ if (v9ses->extended)
+ rcall->params.rerror.errno = buf_get_int16(bufp);
+ break;
+ }
+
+ if (buf_check_overflow(bufp) || buf_check_overflow(dbufp))
+ return 0;
+
+ return rcall->size;
+}
-
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