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  *
10  *   This file is part of InterMezzo, http://www.inter-mezzo.org.
11  *
12  *   InterMezzo is free software; you can redistribute it and/or
13  *   modify it under the terms of version 2 of the GNU General Public
14  *   License as published by the Free Software Foundation.
15  *
16  *   InterMezzo is distributed in the hope that it will be useful,
17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  *   GNU General Public License for more details.
20  *
21  *   You should have received a copy of the GNU General Public License
22  *   along with InterMezzo; if not, write to the Free Software
23  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  */
25 
26 #include <linux/types.h>
27 #include <linux/param.h>
28 #include <linux/sched.h>
29 #include <linux/fs.h>
30 #include <linux/slab.h>
31 #include <linux/vmalloc.h>
32 #include <linux/stat.h>
33 #include <linux/errno.h>
34 #include <linux/smp_lock.h>
35 #include <linux/locks.h>
36 #include <asm/segment.h>
37 #include <asm/uaccess.h>
38 #include <linux/string.h>
39 #if 0
40 #if defined(CONFIG_REISERFS_FS) || defined(CONFIG_REISERFS_FS_MODULE)
41 #include <linux/reiserfs_fs.h>
42 #include <linux/reiserfs_fs_sb.h>
43 #include <linux/reiserfs_fs_i.h>
44 #endif
45 
46 #include <linux/intermezzo_fs.h>
47 #include <linux/intermezzo_psdev.h>
48 
49 #if defined(CONFIG_REISERFS_FS) || defined(CONFIG_REISERFS_FS_MODULE)
50 
51 
52 static loff_t presto_reiserfs_freespace(struct presto_cache *cache,
53                                          struct super_block *sb)
54 {
55         struct reiserfs_super_block * rs = SB_DISK_SUPER_BLOCK (sb);
56 	loff_t avail;
57 
58         avail =   le32_to_cpu(rs->s_free_blocks) *
59 		le16_to_cpu(rs->s_blocksize);
60         return avail;
61 }
62 
63 /* start the filesystem journal operations */
64 static void *presto_reiserfs_trans_start(struct presto_file_set *fset,
65                                    struct inode *inode,
66                                    int op)
67 {
68 	int jblocks;
69         __u32 avail_kmlblocks;
70 	struct reiserfs_transaction_handle *th ;
71 
72 	PRESTO_ALLOC(th, sizeof(*th));
73 	if (!th) {
74 		CERROR("presto: No memory for trans handle\n");
75 		return NULL;
76 	}
77 
78         avail_kmlblocks = presto_reiserfs_freespace(fset->fset_cache,
79 						    inode->i_sb);
80         if ( presto_no_journal(fset) ||
81              strcmp(fset->fset_cache->cache_type, "reiserfs"))
82 		{
83 			CDEBUG(D_JOURNAL, "got cache_type \"%s\"\n",
84 			       fset->fset_cache->cache_type);
85 			return NULL;
86 		}
87 
88         if ( avail_kmlblocks < 3 ) {
89                 return ERR_PTR(-ENOSPC);
90         }
91 
92         if (  (op != PRESTO_OP_UNLINK && op != PRESTO_OP_RMDIR)
93               && avail_kmlblocks < 6 ) {
94                 return ERR_PTR(-ENOSPC);
95         }
96 
97 	jblocks = 3 + JOURNAL_PER_BALANCE_CNT * 4;
98         CDEBUG(D_JOURNAL, "creating journal handle (%d blocks)\n", jblocks);
99 
100 	lock_kernel();
101 	journal_begin(th, inode->i_sb, jblocks);
102 	unlock_kernel();
103 	return th;
104 }
105 
106 static void presto_reiserfs_trans_commit(struct presto_file_set *fset,
107                                          void *handle)
108 {
109 	int jblocks;
110 	jblocks = 3 + JOURNAL_PER_BALANCE_CNT * 4;
111 
112 	lock_kernel();
113 	journal_end(handle, fset->fset_cache->cache_sb, jblocks);
114 	unlock_kernel();
115 	PRESTO_FREE(handle, sizeof(struct reiserfs_transaction_handle));
116 }
117 
118 static void presto_reiserfs_journal_file_data(struct inode *inode)
119 {
120 #ifdef EXT3_JOURNAL_DATA_FL
121         inode->u.ext3_i.i_flags |= EXT3_JOURNAL_DATA_FL;
122 #else
123 #warning You must have a facility to enable journaled writes for recovery!
124 #endif
125 }
126 
127 static int presto_reiserfs_has_all_data(struct inode *inode)
128 {
129         BUG();
130         return 0;
131 }
132 
133 struct journal_ops presto_reiserfs_journal_ops = {
134         .tr_all_data     = presto_reiserfs_has_all_data,
135         .tr_avail        = presto_reiserfs_freespace,
136         .tr_start        = presto_reiserfs_trans_start,
137         .tr_commit       = presto_reiserfs_trans_commit,
138         .tr_journal_data = presto_reiserfs_journal_file_data
139 };
140 
141 #endif
142 #endif
143