278 строки
6.3 KiB
C
278 строки
6.3 KiB
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 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/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,
|
|
};
|