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/kp30.h>
41 #include <linux/lustre_fsfilt.h>
42 #include <linux/obd.h>
43 #include <linux/obd_class.h>
44 #include <linux/module.h>
46 static void *fsfilt_reiserfs_start(struct inode *inode, int op)
48 return (void *)0xf00f00be;
51 static void *fsfilt_reiserfs_brw_start(int objcount, struct fsfilt_objinfo *fso,
52 int niocount, struct niobuf_remote *nb)
54 return (void *)0xf00f00be;
57 static int fsfilt_reiserfs_commit(struct inode *inode, void *handle)
59 if (handle != (void *)0xf00f00be) {
60 CERROR("bad handle %p", handle);
67 static int fsfilt_reiserfs_setattr(struct dentry *dentry, void *handle,
70 struct inode *inode = dentry->d_inode;
75 /* A _really_ horrible hack to avoid removing the data stored
76 * in the block pointers; this is really the "small" stripe MD data.
77 * We can avoid further hackery by virtue of the MDS file size being
78 * zero all the time (which doesn't invoke block truncate at unlink
79 * time), so we assert we never change the MDS file size from zero.
81 if (iattr->ia_valid & ATTR_SIZE) {
82 CERROR("hmm, setting %*s file size to %llu\n",
83 dentry->d_name.len, dentry->d_name.name, iattr->ia_size);
84 LASSERT(iattr->ia_size == 0);
86 /* ATTR_SIZE would invoke truncate: clear it */
87 iattr->ia_valid &= ~ATTR_SIZE;
88 inode->i_size = iattr->ia_size;
90 /* make sure _something_ gets set - so new inode
91 * goes to disk (probably won't work over XFS
93 if (!iattr->ia_valid & ATTR_MODE) {
94 iattr->ia_valid |= ATTR_MODE;
95 iattr->ia_mode = inode->i_mode;
99 if (inode->i_op->setattr)
100 rc = inode->i_op->setattr(dentry, iattr);
102 rc = inode_setattr(inode, iattr);
109 static int fsfilt_reiserfs_set_md(struct inode *inode, void *handle,
110 void *lmm, int lmm_size)
112 /* XXX write stripe data into MDS file itself */
113 CERROR("not implemented yet\n");
118 static int fsfilt_reiserfs_get_md(struct inode *inode, void *lmm, int lmm_size)
121 return inode->i_size;
123 CERROR("not implemented yet\n");
127 static ssize_t fsfilt_reiserfs_readpage(struct file *file, char *buf, size_t count,
130 return file->f_op->read(file, buf, count, offset);
133 static int fsfilt_reiserfs_set_last_rcvd(struct obd_device *obd, __u64 last_rcvd,
134 void *handle, fsfilt_cb_t cb_func)
136 static long next = 0;
138 if (time_after(jiffies, next)) {
139 CERROR("no journal callback kernel patch, faking it...\n");
140 next = jiffies + 300 * HZ;
143 cb_func(obd, last_rcvd, 0);
148 static int fsfilt_reiserfs_journal_data(struct file *filp)
150 CERROR("not implemented yet\n");
154 static int fsfilt_reiserfs_statfs(struct super_block *sb, struct obd_statfs *osfs)
157 int rc = vfs_statfs(sb, &sfs);
159 statfs_pack(osfs, &sfs);
163 static int fsfilt_reiserfs_sync(struct super_block *sb)
165 CERROR("not implemented yet\n");
169 static struct fsfilt_operations fsfilt_reiserfs_ops = {
171 fs_owner: THIS_MODULE,
172 fs_start: fsfilt_reiserfs_start,
173 fs_brw_start: fsfilt_reiserfs_brw_start,
174 fs_commit: fsfilt_reiserfs_commit,
175 fs_setattr: fsfilt_reiserfs_setattr,
176 fs_set_md: fsfilt_reiserfs_set_md,
177 fs_get_md: fsfilt_reiserfs_get_md,
178 fs_readpage: fsfilt_reiserfs_readpage,
179 fs_journal_data: fsfilt_reiserfs_journal_data,
180 fs_set_last_rcvd: fsfilt_reiserfs_set_last_rcvd,
181 fs_statfs: fsfilt_reiserfs_statfs,
182 fs_sync: fsfilt_reiserfs_sync,
185 static int __init fsfilt_reiserfs_init(void)
187 return fsfilt_register_ops(&fsfilt_reiserfs_ops);
190 static void __exit fsfilt_reiserfs_exit(void)
192 fsfilt_unregister_ops(&fsfilt_reiserfs_ops);
195 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
196 MODULE_DESCRIPTION("Lustre reiserfs Filesystem Helper v0.1");
197 MODULE_LICENSE("GPL");
199 module_init(fsfilt_reiserfs_init);
200 module_exit(fsfilt_reiserfs_exit);