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  *
6  *   This file is part of InterMezzo, http://www.inter-mezzo.org.
7  *
8  *   InterMezzo is free software; you can redistribute it and/or
9  *   modify it under the terms of version 2 of the GNU General Public
10  *   License as published by the Free Software Foundation.
11  *
12  *   InterMezzo is distributed in the hope that it will be useful,
13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  *   GNU General Public License for more details.
16  *
17  *   You should have received a copy of the GNU General Public License
18  *   along with InterMezzo; if not, write to the Free Software
19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20  */
21 
22 #include <linux/types.h>
23 #include <linux/kernel.h>
24 #include <linux/sched.h>
25 #include <linux/fs.h>
26 #include <linux/slab.h>
27 #include <linux/vmalloc.h>
28 #include <linux/stat.h>
29 #include <linux/errno.h>
30 #include <linux/locks.h>
31 #include <asm/segment.h>
32 #include <asm/uaccess.h>
33 #include <linux/string.h>
34 #if 0
35 /* XFS Support not there yet */
36 #ifdef CONFIG_FS_XFS
37 #include <linux/xfs_fs.h>
38 #endif
39 #include <linux/intermezzo_fs.h>
40 #include <linux/intermezzo_psdev.h>
41 #include <linux/intermezzo_journal.h>
42 
43 #if 0
44 
45 /* XFS has journalling, but these functions do nothing yet... */
46 
47 static unsigned long presto_xfs_freespace(struct presto_file_set *fset,
48                                          struct super_block *sb)
49 {
50 
51 #if 0
52         vfs_t *vfsp = LINVFS_GET_VFS(sb);
53         struct statvfs_t stat;
54         bhv_desc_t *bdp;
55         unsigned long avail;
56         int rc;
57 
58         VFS_STATVFS(vfsp, &stat, NULL, rc);
59         avail = statp.f_bfree;
60 
61         return sbp->sb_fdblocks;
62 #endif
63         return 0x0fffffff;
64 }
65 
66 
67 /* start the filesystem journal operations */
68 static void *
69 presto_xfs_trans_start(struct presto_file_set *fset,
70 		       struct inode *inode, int op)
71 {
72 	int xfs_op;
73 	/* do a free blocks check as in journal_ext3? does anything protect
74 	 * the space in that case or can it disappear out from under us
75 	 * anyway? */
76 
77 /* copied from xfs_trans.h, skipping header maze for now */
78 #define XFS_TRANS_SETATTR_NOT_SIZE      1
79 #define XFS_TRANS_SETATTR_SIZE          2
80 #define XFS_TRANS_INACTIVE              3
81 #define XFS_TRANS_CREATE                4
82 #define XFS_TRANS_CREATE_TRUNC          5
83 #define XFS_TRANS_TRUNCATE_FILE         6
84 #define XFS_TRANS_REMOVE                7
85 #define XFS_TRANS_LINK                  8
86 #define XFS_TRANS_RENAME                9
87 #define XFS_TRANS_MKDIR                 10
88 #define XFS_TRANS_RMDIR                 11
89 #define XFS_TRANS_SYMLINK               12
90 
91 	/* map the op onto the values for XFS so it can do reservation. if
92 	 * we don't have enough info to differentiate between e.g. setattr
93 	 * with or without size, what do we do? will it adjust? */
94 	switch (op) {
95 	case PRESTO_OP_SETATTR:
96 		/* or XFS_TRANS_SETATTR_NOT_SIZE? */
97 	        xfs_op = XFS_TRANS_SETATTR_SIZE;
98 		break;
99 	case PRESTO_OP_CREATE:
100 		/* or CREATE_TRUNC? */
101 		xfs_op = XFS_TRANS_CREATE;
102 		break;
103 	case PRESTO_OP_LINK:
104 		xfs_op = XFS_TRANS_LINK;
105 		break;
106 	case PRESTO_OP_UNLINK:
107 		xfs_op = XFS_TRANS_REMOVE;
108 		break;
109 	case PRESTO_OP_SYMLINK:
110 		xfs_op = XFS_TRANS_SYMLINK;
111 		break;
112 	case PRESTO_OP_MKDIR:
113 		xfs_op = XFS_TRANS_MKDIR;
114 		break;
115 	case PRESTO_OP_RMDIR:
116 		xfs_op = XFS_TRANS_RMDIR;
117 		break;
118 	case PRESTO_OP_MKNOD:
119 		/* XXX can't find an analog for mknod? */
120 		xfs_op = XFS_TRANS_CREATE;
121 		break;
122 	case PRESTO_OP_RENAME:
123 		xfs_op = XFS_TRANS_RENAME;
124 		break;
125 	default:
126 		CDEBUG(D_JOURNAL, "invalid operation %d for journal\n", op);
127 		return NULL;
128 	}
129 
130 	return xfs_trans_start(inode, xfs_op);
131 }
132 
133 static void presto_xfs_trans_commit(struct presto_file_set *fset, void *handle)
134 {
135 	/* assert (handle == current->j_handle) */
136 	xfs_trans_stop(handle);
137 }
138 
139 static void presto_xfs_journal_file_data(struct inode *inode)
140 {
141         return;
142 }
143 
144 static int presto_xfs_has_all_data(struct inode *inode)
145 {
146         BUG();
147         return 0;
148 }
149 
150 struct journal_ops presto_xfs_journal_ops = {
151         .tr_all_data     = presto_xfs_has_all_data,
152         .tr_avail        = presto_xfs_freespace,
153         .tr_start        = presto_xfs_trans_start,
154         .tr_commit       = presto_xfs_trans_commit,
155         .tr_journal_data = presto_xfs_journal_file_data
156 };
157 
158 #endif
159 
160 
161 #endif /* CONFIG_XFS_FS */
162 
163