1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
3 *
4 * Copyright (C) 1998 Peter J. Braam <braam@clusterfs.com>
5 * Copyright (C) 2000 Red Hat, Inc.
6 * Copyright (C) 2000 Los Alamos National Laboratory
7 * Copyright (C) 2000 TurboLinux, Inc.
8 * Copyright (C) 2001 Mountain View Data, Inc.
9 * Copyright (C) 2001 Tacit Networks, Inc. <phil@off.net>
10 *
11 * This file is part of InterMezzo, http://www.inter-mezzo.org.
12 *
13 * InterMezzo is free software; you can redistribute it and/or
14 * modify it under the terms of version 2 of the GNU General Public
15 * License as published by the Free Software Foundation.
16 *
17 * InterMezzo is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with InterMezzo; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 */
26
27 #include <linux/types.h>
28 #include <linux/param.h>
29 #include <linux/kernel.h>
30 #include <linux/sched.h>
31 #include <linux/fs.h>
32 #include <linux/slab.h>
33 #include <linux/vmalloc.h>
34 #include <linux/stat.h>
35 #include <linux/errno.h>
36 #include <linux/locks.h>
37 #include <asm/segment.h>
38 #include <asm/uaccess.h>
39 #include <linux/string.h>
40 #include <linux/smp_lock.h>
41 #if defined(CONFIG_TMPFS)
42 #include <linux/jbd.h>
43 #if defined(CONFIG_EXT3)
44 #include <linux/ext3_fs.h>
45 #include <linux/ext3_jbd.h>
46 #endif
47 #endif
48
49 #include <linux/intermezzo_fs.h>
50 #include <linux/intermezzo_psdev.h>
51
52 #if defined(CONFIG_TMPFS)
53
54 /* space requirements:
55 presto_do_truncate:
56 used to truncate the KML forward to next fset->chunksize boundary
57 - zero partial block
58 - update inode
59 presto_write_record:
60 write header (< one block)
61 write one path (< MAX_PATHLEN)
62 possibly write another path (< MAX_PATHLEN)
63 write suffix (< one block)
64 presto_update_last_rcvd
65 write one block
66 */
67
presto_tmpfs_freespace(struct presto_cache * cache,struct super_block * sb)68 static loff_t presto_tmpfs_freespace(struct presto_cache *cache,
69 struct super_block *sb)
70 {
71 return (1<<30);
72 }
73
74 /* start the filesystem journal operations */
presto_tmpfs_trans_start(struct presto_file_set * fset,struct inode * inode,int op)75 static void *presto_tmpfs_trans_start(struct presto_file_set *fset,
76 struct inode *inode,
77 int op)
78 {
79 return (void *)1;
80 }
81
presto_tmpfs_trans_commit(struct presto_file_set * fset,void * handle)82 static void presto_tmpfs_trans_commit(struct presto_file_set *fset, void *handle)
83 {
84 return;
85 }
86
presto_tmpfs_journal_file_data(struct inode * inode)87 static void presto_tmpfs_journal_file_data(struct inode *inode)
88 {
89 return;
90 }
91
92 /* The logic here is a slightly modified version of ext3/inode.c:block_to_path
93 */
presto_tmpfs_has_all_data(struct inode * inode)94 static int presto_tmpfs_has_all_data(struct inode *inode)
95 {
96 return 0;
97 }
98
99 struct journal_ops presto_tmpfs_journal_ops = {
100 tr_all_data: presto_tmpfs_has_all_data,
101 tr_avail: presto_tmpfs_freespace,
102 tr_start: presto_tmpfs_trans_start,
103 tr_commit: presto_tmpfs_trans_commit,
104 tr_journal_data: presto_tmpfs_journal_file_data,
105 tr_ilookup: presto_tmpfs_ilookup,
106 tr_add_ilookup: presto_add_ilookup_dentry
107 };
108
109 #endif /* CONFIG_EXT3_FS */
110