[PATCH] v9fs: VFS superblock operations and glue

This part of the patch contains VFS superblock and mapping code.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/9p/v9fs.h

+/*
+ * 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:
+ *  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 */
+
+
+	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_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 char 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;
+};
+
+/* possible values of ->proto */
+enum {
+	PROTO_TCP,
+	PROTO_UNIX,
+	PROTO_FD,
+};
+
+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_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

fs/9p/v9fs_vfs.h

+/*
+ * 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:
+ *  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 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 *);

fs/9p/vfs_super.c

+/*
+ *  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:
+ *  Free Software Foundation
+ *  51 Franklin Street, Fifth Floor
+ *  Boston, MA  02111-1301  USA
+ *
+ */
+
+#include <linux/kernel.h>
+#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 <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 "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_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_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_dentry;
+	}
+
+	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_dentry;
+	}
+
+	return sb;
+
+      release_dentry:
+	dput(sb->s_root);
+
+      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");
+}
+
+/**
+ * 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 struct super_operations v9fs_super_ops = {
+	.statfs = simple_statfs,
+	.clear_inode = v9fs_clear_inode,
+	.show_options = v9fs_show_options,
+};
+
+struct file_system_type v9fs_fs_type = {
+	.name = "9P",
+	.get_sb = v9fs_get_sb,
+	.kill_sb = v9fs_kill_super,
+	.owner = THIS_MODULE,
+};