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/slab.h>
37 #include <linux/pagemap.h>
38 #include <linux/quotaops.h>
39 #include <linux/version.h>
40 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
41 #include <linux/init.h>
42 #include <asm/statfs.h>
44 #include <libcfs/kp30.h>
45 #include <lustre_fsfilt.h>
47 #include <obd_class.h>
48 #include <linux/module.h>
49 #include <linux/init.h>
51 /* XXX We cannot include linux/reiserfs_fs.h here, because of symbols clash,
52 but we need MAX_HEIGHT definition for proper reserve calculations
53 #include <linux/reiserfs_fs.h>
55 #define MAX_HEIGHT 5 /* maximal height of a tree. don't change this without
56 changing JOURNAL_PER_BALANCE_CNT */
58 static void *fsfilt_reiserfs_start(struct inode *inode, int op,
59 void *desc_private, int logs)
61 return (void *)0xf00f00be;
64 static void *fsfilt_reiserfs_brw_start(int objcount, struct fsfilt_objinfo *fso,
65 int niocount, struct niobuf_local *nb,
66 void *desc_private, int logs)
68 return (void *)0xf00f00be;
71 static int fsfilt_reiserfs_commit(struct inode *inode, void *handle,
74 if (handle != (void *)0xf00f00be) {
75 CERROR("bad handle %p", handle);
82 static int fsfilt_reiserfs_setattr(struct dentry *dentry, void *handle,
83 struct iattr *iattr, int do_trunc)
85 struct inode *inode = dentry->d_inode;
90 /* A _really_ horrible hack to avoid removing the data stored
91 * in the block pointers; this is really the "small" stripe MD data.
92 * We can avoid further hackery by virtue of the MDS file size being
93 * zero all the time (which doesn't invoke block truncate at unlink
94 * time), so we assert we never change the MDS file size from zero.
96 if (iattr->ia_valid & ATTR_SIZE && !do_trunc) {
97 /* ATTR_SIZE would invoke truncate: clear it */
98 iattr->ia_valid &= ~ATTR_SIZE;
99 inode->i_size = iattr->ia_size;
101 /* make sure _something_ gets set - so new inode
102 * goes to disk (probably won't work over XFS
104 if (!iattr->ia_valid & ATTR_MODE) {
105 iattr->ia_valid |= ATTR_MODE;
106 iattr->ia_mode = inode->i_mode;
110 /* We set these flags on the client, but have already checked perms
111 * so don't confuse inode_change_ok. */
112 iattr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET);
114 if (inode->i_op->setattr) {
115 rc = inode->i_op->setattr(dentry, iattr);
117 rc = inode_change_ok(inode, iattr);
119 rc = inode_setattr(inode, iattr);
127 static int fsfilt_reiserfs_set_md(struct inode *inode, void *handle,
128 void *lmm, int lmm_size, const char *name)
130 /* XXX write stripe data into MDS file itself */
131 CERROR("not implemented yet\n");
136 static int fsfilt_reiserfs_get_md(struct inode *inode, void *lmm, int lmm_size,
140 return inode->i_size;
142 CERROR("not implemented yet\n");
146 static ssize_t fsfilt_reiserfs_readpage(struct file *file, char *buf, size_t count,
149 return file->f_op->read(file, buf, count, offset);
152 static int fsfilt_reiserfs_add_journal_cb(struct obd_device *obd,
153 __u64 last_rcvd, void *handle,
154 fsfilt_cb_t cb_func, void *cb_data)
156 static unsigned long next = 0;
158 if (time_after(jiffies, next)) {
159 CERROR("no journal callback kernel patch, faking it...\n");
160 next = jiffies + 300 * HZ;
163 cb_func(obd, last_rcvd, cb_data, 0);
168 static int fsfilt_reiserfs_statfs(struct super_block *sb,
169 struct obd_statfs *osfs)
174 memset(&sfs, 0, sizeof(sfs));
175 rc = ll_do_statfs(sb, &sfs);
176 statfs_pack(osfs, &sfs);
180 static int fsfilt_reiserfs_sync(struct super_block *sb)
182 return fsync_dev(sb->s_dev);
185 /* If fso is NULL, op is FSFILT operation, otherwise op is number of fso
186 objects. Logs is number of logfiles to update */
187 static int fsfilt_reiserfs_get_op_len(int op, struct fsfilt_objinfo *fso,
192 case FSFILT_OP_CREATE:
193 /* directory leaf, index & indirect & EA*/
194 return MAX_HEIGHT + logs;
195 case FSFILT_OP_UNLINK:
196 return MAX_HEIGHT + logs;
201 int needed = MAX_HEIGHT;
202 struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
203 int blockpp = 1 << (CFS_PAGE_SHIFT - sb->s_blocksize_bits);
204 for (i = 0; i < op; i++, fso++) {
205 int nblocks = fso->fso_bufcnt * blockpp;
209 return needed + logs;
214 static struct fsfilt_operations fsfilt_reiserfs_ops = {
215 .fs_type = "reiserfs",
216 .fs_owner = THIS_MODULE,
217 .fs_start = fsfilt_reiserfs_start,
218 .fs_brw_start = fsfilt_reiserfs_brw_start,
219 .fs_commit = fsfilt_reiserfs_commit,
220 .fs_setattr = fsfilt_reiserfs_setattr,
221 .fs_set_md = fsfilt_reiserfs_set_md,
222 .fs_get_md = fsfilt_reiserfs_get_md,
223 .fs_readpage = fsfilt_reiserfs_readpage,
224 .fs_add_journal_cb = fsfilt_reiserfs_add_journal_cb,
225 .fs_statfs = fsfilt_reiserfs_statfs,
226 .fs_sync = fsfilt_reiserfs_sync,
227 .fs_get_op_len = fsfilt_reiserfs_get_op_len,
230 static int __init fsfilt_reiserfs_init(void)
232 return fsfilt_register_ops(&fsfilt_reiserfs_ops);
235 static void __exit fsfilt_reiserfs_exit(void)
237 fsfilt_unregister_ops(&fsfilt_reiserfs_ops);
240 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
241 MODULE_DESCRIPTION("Lustre reiserfs Filesystem Helper v0.1");
242 MODULE_LICENSE("GPL");
244 module_init(fsfilt_reiserfs_init);
245 module_exit(fsfilt_reiserfs_exit);