5bdad93387
Allow a 9p2000.L server to supply the statfs f_type value rather than hardwiring V9FS_MAGIC. It is desirable to give the server this option in some applications, e.g. I/O forwarding. Signed-off-by: Jim Garlick <garlick@llnl.gov> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
369 lines
8.6 KiB
C
369 lines
8.6 KiB
C
/*
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* linux/fs/9p/vfs_super.c
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*
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* This file contians superblock ops for 9P2000. It is intended that
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* you mount this file system on directories.
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/inet.h>
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#include <linux/pagemap.h>
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#include <linux/seq_file.h>
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#include <linux/mount.h>
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#include <linux/idr.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/statfs.h>
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#include <linux/magic.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include "v9fs.h"
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#include "v9fs_vfs.h"
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#include "fid.h"
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#include "xattr.h"
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#include "acl.h"
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static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
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/**
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* v9fs_set_super - set the superblock
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* @s: super block
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* @data: file system specific data
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*
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*/
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static int v9fs_set_super(struct super_block *s, void *data)
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{
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s->s_fs_info = data;
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return set_anon_super(s, data);
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}
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/**
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* v9fs_fill_super - populate superblock with info
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* @sb: superblock
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* @v9ses: session information
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* @flags: flags propagated from v9fs_mount()
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*
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*/
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static void
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v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
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int flags, void *data)
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{
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
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sb->s_blocksize = 1 << sb->s_blocksize_bits;
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sb->s_magic = V9FS_MAGIC;
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if (v9fs_proto_dotl(v9ses)) {
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sb->s_op = &v9fs_super_ops_dotl;
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sb->s_xattr = v9fs_xattr_handlers;
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} else
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sb->s_op = &v9fs_super_ops;
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sb->s_bdi = &v9ses->bdi;
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if (v9ses->cache)
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sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024)/PAGE_CACHE_SIZE;
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sb->s_flags = flags | MS_ACTIVE | MS_DIRSYNC | MS_NOATIME;
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if (!v9ses->cache)
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sb->s_flags |= MS_SYNCHRONOUS;
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#ifdef CONFIG_9P_FS_POSIX_ACL
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if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
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sb->s_flags |= MS_POSIXACL;
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#endif
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save_mount_options(sb, data);
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}
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/**
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* v9fs_mount - mount a superblock
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* @fs_type: file system type
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* @flags: mount flags
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* @dev_name: device name that was mounted
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* @data: mount options
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*
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*/
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static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
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const char *dev_name, void *data)
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{
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struct super_block *sb = NULL;
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struct inode *inode = NULL;
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struct dentry *root = NULL;
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struct v9fs_session_info *v9ses = NULL;
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umode_t mode = S_IRWXUGO | S_ISVTX;
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struct p9_fid *fid;
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int retval = 0;
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p9_debug(P9_DEBUG_VFS, "\n");
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v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
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if (!v9ses)
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return ERR_PTR(-ENOMEM);
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fid = v9fs_session_init(v9ses, dev_name, data);
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if (IS_ERR(fid)) {
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retval = PTR_ERR(fid);
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/*
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* we need to call session_close to tear down some
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* of the data structure setup by session_init
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*/
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goto close_session;
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}
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sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
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if (IS_ERR(sb)) {
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retval = PTR_ERR(sb);
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goto clunk_fid;
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}
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v9fs_fill_super(sb, v9ses, flags, data);
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if (v9ses->cache)
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sb->s_d_op = &v9fs_cached_dentry_operations;
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else
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sb->s_d_op = &v9fs_dentry_operations;
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inode = v9fs_get_inode(sb, S_IFDIR | mode, 0);
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if (IS_ERR(inode)) {
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retval = PTR_ERR(inode);
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goto release_sb;
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}
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root = d_alloc_root(inode);
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if (!root) {
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iput(inode);
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retval = -ENOMEM;
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goto release_sb;
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}
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sb->s_root = root;
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if (v9fs_proto_dotl(v9ses)) {
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struct p9_stat_dotl *st = NULL;
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st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
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if (IS_ERR(st)) {
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retval = PTR_ERR(st);
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goto release_sb;
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}
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root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
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v9fs_stat2inode_dotl(st, root->d_inode);
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kfree(st);
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} else {
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struct p9_wstat *st = NULL;
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st = p9_client_stat(fid);
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if (IS_ERR(st)) {
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retval = PTR_ERR(st);
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goto release_sb;
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}
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root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
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v9fs_stat2inode(st, root->d_inode, sb);
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p9stat_free(st);
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kfree(st);
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}
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retval = v9fs_get_acl(inode, fid);
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if (retval)
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goto release_sb;
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v9fs_fid_add(root, fid);
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p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n");
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return dget(sb->s_root);
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clunk_fid:
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p9_client_clunk(fid);
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close_session:
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v9fs_session_close(v9ses);
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kfree(v9ses);
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return ERR_PTR(retval);
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release_sb:
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/*
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* we will do the session_close and root dentry release
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* in the below call. But we need to clunk fid, because we haven't
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* attached the fid to dentry so it won't get clunked
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* automatically.
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*/
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p9_client_clunk(fid);
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deactivate_locked_super(sb);
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return ERR_PTR(retval);
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}
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/**
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* v9fs_kill_super - Kill Superblock
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* @s: superblock
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*
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*/
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static void v9fs_kill_super(struct super_block *s)
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{
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struct v9fs_session_info *v9ses = s->s_fs_info;
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p9_debug(P9_DEBUG_VFS, " %p\n", s);
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kill_anon_super(s);
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v9fs_session_cancel(v9ses);
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v9fs_session_close(v9ses);
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kfree(v9ses);
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s->s_fs_info = NULL;
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p9_debug(P9_DEBUG_VFS, "exiting kill_super\n");
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}
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static void
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v9fs_umount_begin(struct super_block *sb)
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{
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struct v9fs_session_info *v9ses;
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v9ses = sb->s_fs_info;
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v9fs_session_begin_cancel(v9ses);
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}
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static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct v9fs_session_info *v9ses;
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struct p9_fid *fid;
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struct p9_rstatfs rs;
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int res;
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fid = v9fs_fid_lookup(dentry);
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if (IS_ERR(fid)) {
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res = PTR_ERR(fid);
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goto done;
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}
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v9ses = v9fs_dentry2v9ses(dentry);
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if (v9fs_proto_dotl(v9ses)) {
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res = p9_client_statfs(fid, &rs);
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if (res == 0) {
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buf->f_type = rs.type;
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buf->f_bsize = rs.bsize;
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buf->f_blocks = rs.blocks;
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buf->f_bfree = rs.bfree;
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buf->f_bavail = rs.bavail;
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buf->f_files = rs.files;
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buf->f_ffree = rs.ffree;
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buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL;
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buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
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buf->f_namelen = rs.namelen;
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}
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if (res != -ENOSYS)
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goto done;
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}
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res = simple_statfs(dentry, buf);
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done:
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return res;
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}
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static int v9fs_drop_inode(struct inode *inode)
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{
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struct v9fs_session_info *v9ses;
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v9ses = v9fs_inode2v9ses(inode);
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if (v9ses->cache)
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return generic_drop_inode(inode);
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/*
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* in case of non cached mode always drop the
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* the inode because we want the inode attribute
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* to always match that on the server.
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*/
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return 1;
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}
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static int v9fs_write_inode(struct inode *inode,
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struct writeback_control *wbc)
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{
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int ret;
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struct p9_wstat wstat;
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struct v9fs_inode *v9inode;
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/*
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* send an fsync request to server irrespective of
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* wbc->sync_mode.
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*/
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p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
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v9inode = V9FS_I(inode);
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if (!v9inode->writeback_fid)
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return 0;
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v9fs_blank_wstat(&wstat);
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ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
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if (ret < 0) {
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__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
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return ret;
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}
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return 0;
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}
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static int v9fs_write_inode_dotl(struct inode *inode,
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struct writeback_control *wbc)
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{
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int ret;
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struct v9fs_inode *v9inode;
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/*
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* send an fsync request to server irrespective of
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* wbc->sync_mode.
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*/
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p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
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v9inode = V9FS_I(inode);
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if (!v9inode->writeback_fid)
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return 0;
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ret = p9_client_fsync(v9inode->writeback_fid, 0);
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if (ret < 0) {
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__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
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return ret;
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}
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return 0;
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}
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static const struct super_operations v9fs_super_ops = {
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.alloc_inode = v9fs_alloc_inode,
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.destroy_inode = v9fs_destroy_inode,
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.statfs = simple_statfs,
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.evict_inode = v9fs_evict_inode,
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.show_options = generic_show_options,
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.umount_begin = v9fs_umount_begin,
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.write_inode = v9fs_write_inode,
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};
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static const struct super_operations v9fs_super_ops_dotl = {
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.alloc_inode = v9fs_alloc_inode,
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.destroy_inode = v9fs_destroy_inode,
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.statfs = v9fs_statfs,
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.drop_inode = v9fs_drop_inode,
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.evict_inode = v9fs_evict_inode,
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.show_options = generic_show_options,
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.umount_begin = v9fs_umount_begin,
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.write_inode = v9fs_write_inode_dotl,
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};
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struct file_system_type v9fs_fs_type = {
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.name = "9p",
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.mount = v9fs_mount,
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.kill_sb = v9fs_kill_super,
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.owner = THIS_MODULE,
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.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT,
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};
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