1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * lustre/lib/fsfilt_reiserfs.c
5 * Lustre filesystem abstraction routines
7 * Copyright (C) 2002 Cluster File Systems, Inc.
8 * Author: Andreas Dilger <adilger@clusterfs.com>
10 * This file is part of Lustre, http://www.lustre.org.
12 * Lustre 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.
16 * Lustre 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.
21 * You should have received a copy of the GNU General Public License
22 * along with Lustre; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 * NOTE - According to Hans Reiser, this could actually be implemented more
28 * efficiently than creating a directory and putting ASCII objids in it.
29 * Instead, we should return the reiserfs object ID as the lustre objid
30 * (although I'm not sure what impact that would have on backup/restore).
33 #define DEBUG_SUBSYSTEM S_FILTER
36 #include <linux/jbd.h>
37 #include <linux/slab.h>
38 #include <linux/pagemap.h>
39 #include <linux/quotaops.h>
40 #include <linux/version.h>
41 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
42 #include <linux/init.h>
43 #include <asm/statfs.h>
45 #include <linux/kp30.h>
46 #include <linux/lustre_fsfilt.h>
47 #include <linux/obd.h>
48 #include <linux/obd_class.h>
49 #include <linux/module.h>
50 #include <linux/init.h>
52 static void *fsfilt_reiserfs_start(struct inode *inode, int op,
55 return (void *)0xf00f00be;
58 static void *fsfilt_reiserfs_brw_start(int objcount, struct fsfilt_objinfo *fso,
59 int niocount, void *desc_private)
61 return (void *)0xf00f00be;
64 static int fsfilt_reiserfs_commit(struct inode *inode, void *handle,
67 if (handle != (void *)0xf00f00be) {
68 CERROR("bad handle %p", handle);
75 static int fsfilt_reiserfs_setattr(struct dentry *dentry, void *handle,
76 struct iattr *iattr, int do_trunc)
78 struct inode *inode = dentry->d_inode;
83 /* A _really_ horrible hack to avoid removing the data stored
84 * in the block pointers; this is really the "small" stripe MD data.
85 * We can avoid further hackery by virtue of the MDS file size being
86 * zero all the time (which doesn't invoke block truncate at unlink
87 * time), so we assert we never change the MDS file size from zero.
89 if (iattr->ia_valid & ATTR_SIZE && !do_trunc) {
90 /* ATTR_SIZE would invoke truncate: clear it */
91 iattr->ia_valid &= ~ATTR_SIZE;
92 inode->i_size = iattr->ia_size;
94 /* make sure _something_ gets set - so new inode
95 * goes to disk (probably won't work over XFS
97 if (!iattr->ia_valid & ATTR_MODE) {
98 iattr->ia_valid |= ATTR_MODE;
99 iattr->ia_mode = inode->i_mode;
103 /* We set these flags on the client, but have already checked perms
104 * so don't confuse inode_change_ok. */
105 iattr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET);
107 if (inode->i_op->setattr) {
108 rc = inode->i_op->setattr(dentry, iattr);
110 rc = inode_change_ok(inode, iattr);
112 rc = inode_setattr(inode, iattr);
120 static int fsfilt_reiserfs_set_md(struct inode *inode, void *handle,
121 void *lmm, int lmm_size)
123 /* XXX write stripe data into MDS file itself */
124 CERROR("not implemented yet\n");
129 static int fsfilt_reiserfs_get_md(struct inode *inode, void *lmm, int lmm_size)
132 return inode->i_size;
134 CERROR("not implemented yet\n");
138 static ssize_t fsfilt_reiserfs_readpage(struct file *file, char *buf, size_t count,
141 return file->f_op->read(file, buf, count, offset);
144 static int fsfilt_reiserfs_add_journal_cb(struct obd_device *obd,
145 __u64 last_rcvd, void *handle,
146 fsfilt_cb_t cb_func, void *cb_data)
148 static long next = 0;
150 if (time_after(jiffies, next)) {
151 CERROR("no journal callback kernel patch, faking it...\n");
152 next = jiffies + 300 * HZ;
155 cb_func(obd, last_rcvd, cb_data, 0);
160 static int fsfilt_reiserfs_statfs(struct super_block *sb, struct obd_statfs *osfs)
163 int rc = vfs_statfs(sb, &sfs);
165 statfs_pack(osfs, &sfs);
169 static int fsfilt_reiserfs_sync(struct super_block *sb)
171 return fsync_dev(sb->s_dev);
174 static struct fsfilt_operations fsfilt_reiserfs_ops = {
176 fs_owner: THIS_MODULE,
177 fs_start: fsfilt_reiserfs_start,
178 fs_brw_start: fsfilt_reiserfs_brw_start,
179 fs_commit: fsfilt_reiserfs_commit,
180 fs_setattr: fsfilt_reiserfs_setattr,
181 fs_set_md: fsfilt_reiserfs_set_md,
182 fs_get_md: fsfilt_reiserfs_get_md,
183 fs_readpage: fsfilt_reiserfs_readpage,
184 fs_add_journal_cb: fsfilt_reiserfs_add_journal_cb,
185 fs_statfs: fsfilt_reiserfs_statfs,
186 fs_sync: fsfilt_reiserfs_sync,
189 static int __init fsfilt_reiserfs_init(void)
191 return fsfilt_register_ops(&fsfilt_reiserfs_ops);
194 static void __exit fsfilt_reiserfs_exit(void)
196 fsfilt_unregister_ops(&fsfilt_reiserfs_ops);
199 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
200 MODULE_DESCRIPTION("Lustre reiserfs Filesystem Helper v0.1");
201 MODULE_LICENSE("GPL");
203 module_init(fsfilt_reiserfs_init);
204 module_exit(fsfilt_reiserfs_exit);