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Subject[RFC][PATCH 4/7] v9fs: VFS superblock operations and glue (2.0-rc7)
This is part [4/7] of the v9fs-2.0-rc7 patch against Linux 2.6.

This part of the patch contains VFS superblock and mapping code.

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

----------

v9fs.c | 412 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
v9fs.h | 84 ++++++++++++
v9fs_vfs.h | 51 +++++++
vfs_super.c | 257 +++++++++++++++++++++++++++++++++++++
4 files changed, 804 insertions(+)

----------

Index: fs/9p/v9fs.h
===================================================================
--- /dev/null (tree:3c5e9440c6a37c3355b50608836a23c8fa4eec99)
+++ 7d6ca5270f0ecf9306a944a3d39897a97dc9f67f/fs/9p/v9fs.h (mode:100644)
@@ -0,0 +1,84 @@
+/*
+ * 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 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
+ *
+ */
+
+/*
+ * 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 */
+
+ 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 idpool fidpool; /* The FID pool for file descriptors */
+ struct idpool tidpool; /* The TID pool for transactions ids */
+
+ /* transport information */
+ struct v9fs_transport *transport;
+
+ int inprogress; /* session in progress => true */
+ int shutdown; /* session shutting down. no more attaches. */
+ unsigned long session_hung;
+
+ /* mux private data */
+ struct v9fs_fcall *curfcall;
+ wait_queue_head_t read_wait;
+ struct completion fcread;
+ struct completion proccmpl;
+ struct task_struct *recvproc;
+
+ spinlock_t muxlock;
+ struct list_head mux_fcalls;
+};
+
+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_option(char *opts, char *name, char *buf, int buflen);
+long long v9fs_get_int_option(char *opts, char *name, long long dflt);
+int v9fs_parse_tcp_devname(const char *devname, char **addr, char **remotename);
+
+#define V9FS_MAGIC 0x01021997
+
+/* other default globals */
+#define V9FS_PORT 564
+#define V9FS_DEFUSER "nobody"
+#define V9FS_DEFANAME ""
+
+/* inital pool sizes for fids and tags */
+#define V9FS_START_FIDS 8192
+#define V9FS_START_TIDS 256
+
+#define safe_cache_free(x, y) { if(y) kmem_cache_free(x, y); }
Index: fs/9p/v9fs.c
===================================================================
--- /dev/null (tree:3c5e9440c6a37c3355b50608836a23c8fa4eec99)
+++ 7d6ca5270f0ecf9306a944a3d39897a97dc9f67f/fs/9p/v9fs.c (mode:100644)
@@ -0,0 +1,412 @@
+/*
+ * 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 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 <linux/parser.h>
+
+#include "debug.h"
+#include "idpool.h"
+#include "v9fs.h"
+#include "9p.h"
+#include "v9fs_vfs.h"
+#include "transport.h"
+#include "mux.h"
+#include "conv.h"
+
+/* TODO: sysfs or debugfs interface */
+int v9fs_debug_level = 0; /* feature-rific global debug level */
+
+/*
+ * Option Parsing (code inspired by NFS code)
+ *
+ */
+
+enum {
+ PROTO_TCP,
+ PROTO_UNIX,
+};
+
+enum {
+ /* Options that take integer arguments */
+ Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid, Opt_debug,
+ /* String options */
+ Opt_name, Opt_remotename,
+ /* Options that take no arguments */
+ Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp,
+ /* 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_debug, "debug=%u"},
+ {Opt_name, "name=%s"},
+ {Opt_remotename, "aname=%s"},
+ {Opt_unix, "proto=unix"},
+ {Opt_tcp, "proto=tcp"},
+ {Opt_tcp, "tcp"},
+ {Opt_unix, "unix"},
+ {Opt_legacy, "noextend"},
+ {Opt_nodevmap, "nodevmap"},
+ {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;
+
+ if (!options)
+ return;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ int token;
+ if (!*p)
+ continue;
+ token = match_token(p, tokens, args);
+ if (token < Opt_name) {
+ 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_debug:
+ v9ses->debug = option;
+ break;
+ case Opt_tcp:
+ v9ses->proto = PROTO_TCP;
+ break;
+ case Opt_unix:
+ v9ses->proto = PROTO_UNIX;
+ break;
+ case Opt_name:
+ 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;
+ default:
+ continue;
+ }
+ }
+
+ dprintk(DEBUG_9P, "options=\n");
+ dprintk(DEBUG_9P, " debug: %x\n", v9ses->debug);
+ dprintk(DEBUG_9P, " port: %u\n", v9ses->port);
+ dprintk(DEBUG_9P, " msize: %u\n", v9ses->maxdata);
+ dprintk(DEBUG_9P, " uid: %u\n", v9ses->uid);
+ dprintk(DEBUG_9P, " gid: %u\n", v9ses->gid);
+ dprintk(DEBUG_9P, " afid: %d\n", v9ses->afid);
+ dprintk(DEBUG_9P, " proto: %u\n", v9ses->proto);
+ dprintk(DEBUG_9P, " extended: %u\n", v9ses->extended);
+ dprintk(DEBUG_9P, " nomapdev: %u\n", v9ses->nodev);
+ dprintk(DEBUG_9P, " name: %s\n", v9ses->name);
+ dprintk(DEBUG_9P, " remotename: %s\n", v9ses->remotename);
+}
+
+/**
+ * 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)
+{
+ if (inode) {
+ if (inode->i_sb) {
+ if (inode->i_sb->s_fs_info)
+ return (inode->i_sb->s_fs_info);
+ else {
+ dprintk(DEBUG_ERROR, "no s_fs_info\n");
+ return NULL;
+ }
+ } else {
+ dprintk(DEBUG_ERROR, "no superblock\n");
+ return NULL;
+ }
+ }
+ dprintk(DEBUG_ERROR, "no inode\n");
+ return 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;
+
+ 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 TIDs */
+ v9fs_alloc_idpool(&v9ses->fidpool, V9FS_START_FIDS);
+ v9fs_alloc_idpool(&v9ses->tidpool, V9FS_START_TIDS);
+
+ switch (v9ses->proto) {
+ case PROTO_TCP:
+ trans_proto = &v9fs_trans_tcp;
+ break;
+ case PROTO_UNIX:
+ trans_proto = &v9fs_trans_unix;
+ *v9ses->remotename = 0;
+ break;
+ default:
+ printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
+ retval = -ENOPROTOOPT;
+ goto SessCleanUp;
+ };
+
+ v9ses->transport = kmalloc(sizeof(struct v9fs_transport), GFP_KERNEL);
+ if (!v9ses->transport) {
+ eprintk(KERN_WARNING,
+ "Couldn't allocate string for transport struct\n");
+ retval = -ENOMEM;
+ goto SessCleanUp;
+ }
+
+ memcpy(v9ses->transport, trans_proto, sizeof(struct v9fs_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;
+
+ if ((retval = v9fs_mux_init(v9ses, dev_name)) < 0) {
+ 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;
+ }
+
+ /* Really should check for 9P1 and report error */
+ if (!strcmp(fcall->params.rversion.version, "9P2000.u")) {
+ dprintk(DEBUG_9P, "9P2000 UNIX extensions enabled\n");
+ v9ses->extended = 1;
+ } else {
+ dprintk(DEBUG_9P, "9P2000 legacy mode enabled\n");
+ v9ses->extended = 0;
+ }
+
+ 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) {
+ if (v9fs_t_clunk(v9ses, v9ses->afid, NULL))
+ 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->recvproc) {
+ send_sig(SIGKILL, v9ses->recvproc, 1);
+ wait_for_completion(&v9ses->proccmpl);
+ }
+
+ if (v9ses->transport) {
+ v9ses->transport->close(v9ses->transport);
+ kfree(v9ses->transport);
+ }
+
+ putname(v9ses->name);
+ putname(v9ses->remotename);
+
+ v9fs_free_idpool(&v9ses->fidpool);
+ v9fs_free_idpool(&v9ses->tidpool);
+}
+
+extern int v9fs_error_init(void);
+
+/**
+ * v9fs_init - Initialize module
+ *
+ */
+
+static int __init init_v9fs(void)
+{
+ v9fs_error_init();
+
+ printk(KERN_INFO "Installing v9fs 9P2000 file system support\n");
+
+ return register_filesystem(&v9fs_fs_type);
+}
+
+/**
+ * v9fs_init - shutdown module
+ *
+ */
+
+static void __exit exit_v9fs(void)
+{
+ 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");
Index: fs/9p/v9fs_vfs.h
===================================================================
--- /dev/null (tree:3c5e9440c6a37c3355b50608836a23c8fa4eec99)
+++ 7d6ca5270f0ecf9306a944a3d39897a97dc9f67f/fs/9p/v9fs_vfs.h (mode:100644)
@@ -0,0 +1,51 @@
+/*
+ * 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 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
+ *
+ */
+
+/* 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 struct file_operations v9fs_file_operations;
+extern struct file_operations v9fs_dir_operations;
+extern struct dentry_operations v9fs_dentry_operations;
+
+struct inode *v9fs_get_inode(struct super_block *sb, int mode);
+ino_t v9fs_qid2ino(struct v9fs_qid *qid);
+void v9fs_mistat2inode(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_inode2mistat(struct inode *inode, struct v9fs_stat *mistat);
+void v9fs_dentry_release(struct dentry *);
Index: fs/9p/vfs_super.c
===================================================================
--- /dev/null (tree:3c5e9440c6a37c3355b50608836a23c8fa4eec99)
+++ 7d6ca5270f0ecf9306a944a3d39897a97dc9f67f/fs/9p/vfs_super.c (mode:100644)
@@ -0,0 +1,257 @@
+/*
+ * 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 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 <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 "debug.h"
+#include "idpool.h"
+#include "v9fs.h"
+#include "9p.h"
+#include "v9fs_vfs.h"
+#include "conv.h"
+#include "fid.h"
+
+static void v9fs_clear_inode(struct inode *);
+static 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_block_bits - Determine bits in blocksize (from NFS Code)
+ * @bsize: blocksize
+ * @nrbitsp: number of bits
+ *
+ * this bit from linux/fs/nfs/inode.c
+ * Copyright (C) 1992 Rick Sladkey
+ * XXX - shouldn't there be a global linux function for this?
+ *
+ */
+
+static inline unsigned long
+v9fs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
+{
+ /* make sure blocksize is a power of two */
+ if ((bsize & (bsize - 1)) || nrbitsp) {
+ unsigned char nrbits;
+
+ for (nrbits = 31; nrbits && !(bsize & (1 << nrbits));
+ nrbits--) ;
+ bsize = 1 << nrbits;
+ if (nrbitsp)
+ *nrbitsp = nrbits;
+ }
+
+ return bsize;
+}
+
+/**
+ * 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 =
+ v9fs_block_bits(v9ses->maxdata, &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_NODIRATIME | 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
+ *
+ */
+
+static struct super_block *v9fs_get_sb(struct file_system_type
+ *fs_type, int flags,
+ const char *dev_name, void *data)
+{
+ 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 = kcalloc(1, sizeof(struct v9fs_session_info), GFP_KERNEL);
+ if (!v9ses)
+ return ERR_PTR(-ENOMEM);
+
+ if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) {
+ dprintk(DEBUG_ERROR, "problem initiating session\n");
+ retval = newfid;
+ goto free_session;
+ }
+
+ sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
+
+ 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 release_inode;
+ }
+
+ sb->s_root = root;
+
+ /* Setup the Root Inode */
+ root_fid = v9fs_fid_create(root);
+ if (root_fid == NULL) {
+ retval = -ENOMEM;
+ goto release_inode;
+ }
+
+ root_fid->fidopen = 0;
+ root_fid->v9ses = v9ses;
+
+ stat_result = v9fs_t_stat(v9ses, newfid, &fcall);
+ if (stat_result < 0) {
+ dprintk(DEBUG_ERROR, "stat error\n");
+ v9fs_t_clunk(v9ses, newfid, NULL);
+ v9fs_put_idpool(newfid, &v9ses->fidpool);
+ } else {
+ root_fid->fid = newfid;
+ root_fid->qid = fcall->params.rstat.stat->qid;
+ root->d_inode->i_ino =
+ v9fs_qid2ino(&fcall->params.rstat.stat->qid);
+ v9fs_mistat2inode(fcall->params.rstat.stat, root->d_inode, sb);
+ }
+ kfree( fcall);
+
+ if (stat_result < 0) {
+ retval = stat_result;
+ goto release_inode;
+ }
+
+ return sb;
+
+ release_inode:
+ iput(inode);
+
+ put_back_sb:
+ up_write(&sb->s_umount);
+ deactivate_super(sb);
+
+ v9fs_session_close(v9ses);
+
+ free_session:
+ kfree(v9ses);
+
+ return ERR_PTR(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");
+}
+
+static struct super_operations v9fs_super_ops = {
+ .statfs = simple_statfs,
+ .clear_inode = v9fs_clear_inode,
+};
+
+struct file_system_type v9fs_fs_type = {
+ .name = "9P",
+ .get_sb = v9fs_get_sb,
+ .kill_sb = v9fs_kill_super,
+ .owner = THIS_MODULE,
+};
-
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