Wrote a reiserfs filter module (mostly does nothing) for obdfilter while

waiting for extN.

diff --git a/lustre/obdclass/fsfilt_reiserfs.c b/lustre/obdclass/fsfilt_reiserfs.c
new file mode 100644 (file)
index 0000000..f48b8b5
--- /dev/null
+++ b/lustre/obdclass/fsfilt_reiserfs.c
@@ -0,0 +1,192 @@
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ *
+ *  lustre/lib/fsfilt_reiserfs.c
+ *  Lustre filesystem abstraction routines
+ *
+ *  Copyright (C) 2002 Cluster File Systems, Inc.
+ *   Author: Andreas Dilger <adilger@clusterfs.com>
+ *
+ *   This file is part of Lustre, http://www.lustre.org.
+ *
+ *   Lustre is free software; you can redistribute it and/or
+ *   modify it under the terms of version 2 of the GNU General Public
+ *   License as published by the Free Software Foundation.
+ *
+ *   Lustre is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Lustre; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/*
+ * NOTE - According to Hans Reiser, this could actually be implemented more
+ *        efficiently than creating a directory and putting ASCII objids in it.
+ *        Instead, we should return the reiserfs object ID as the lustre objid
+ *        (although I'm not sure what impact that would have on backup/restore).
+ */
+
+#define DEBUG_SUBSYSTEM S_FILTER
+
+#include <linux/fs.h>
+#include <linux/jbd.h>
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+#include <linux/quotaops.h>
+#include <linux/kp30.h>
+#include <linux/lustre_fsfilt.h>
+#include <linux/obd.h>
+#include <linux/module.h>
+
+static void *fsfilt_reiserfs_start(struct inode *inode, int op)
+{
+        return (void *)0xf00f00be;
+}
+
+static void *fsfilt_reiserfs_brw_start(int objcount, struct fsfilt_objinfo *fso,
+                                   int niocount, struct niobuf_remote *nb)
+{
+        return (void *)0xf00f00be;
+}
+
+static int fsfilt_reiserfs_commit(struct inode *inode, void *handle)
+{
+        if (handle != (void *)0xf00f00be) {
+                CERROR("bad handle %p", handle);
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static int fsfilt_reiserfs_setattr(struct dentry *dentry, void *handle,
+                               struct iattr *iattr)
+{
+        struct inode *inode = dentry->d_inode;
+        int rc;
+
+        lock_kernel();
+
+        /* A _really_ horrible hack to avoid removing the data stored
+         * in the block pointers; this is really the "small" stripe MD data.
+         * We can avoid further hackery by virtue of the MDS file size being
+         * zero all the time (which doesn't invoke block truncate at unlink
+         * time), so we assert we never change the MDS file size from zero.
+         */
+        if (iattr->ia_valid & ATTR_SIZE) {
+                CERROR("hmm, setting %*s file size to "LPU64"\n",
+                       dentry->d_name.len, dentry->d_name.name, iattr->ia_size);
+                LASSERT(iattr->ia_size == 0);
+#if 0
+                /* ATTR_SIZE would invoke truncate: clear it */
+                iattr->ia_valid &= ~ATTR_SIZE;
+                inode->i_size = iattr->ia_size;
+
+                /* make sure _something_ gets set - so new inode
+                 * goes to disk (probably won't work over XFS
+                 */
+                if (!iattr->ia_valid & ATTR_MODE) {
+                        iattr->ia_valid |= ATTR_MODE;
+                        iattr->ia_mode = inode->i_mode;
+                }
+#endif
+        }
+        if (inode->i_op->setattr)
+                rc = inode->i_op->setattr(dentry, iattr);
+        else
+                rc = inode_setattr(inode, iattr);
+
+        unlock_kernel();
+
+        return rc;
+}
+
+static int fsfilt_reiserfs_set_md(struct inode *inode, void *handle,
+                                  void *lmm, int lmm_size)
+{
+        /* XXX write stripe data into MDS file itself */
+        CERROR("not implemented yet\n");
+
+        return -ENOSYS;
+}
+
+static int fsfilt_reiserfs_get_md(struct inode *inode, void *lmm, int lmm_size)
+{
+        if (lmm == NULL)
+                return inode->i_size;
+
+        CERROR("not implemented yet\n");
+        return -ENOSYS;
+}
+
+static ssize_t fsfilt_reiserfs_readpage(struct file *file, char *buf, size_t count,
+                                        loff_t *offset)
+{
+        return file->f_op->read(file, buf, count, offset);
+}
+
+static int fsfilt_reiserfs_set_last_rcvd(struct obd_device *obd, __u64 last_rcvd,
+                                         void *handle, fsfilt_cb_t cb_func)
+{
+        static long next = 0;
+
+        if (time_after(jiffies, next)) {
+                CERROR("no journal callback kernel patch, faking it...\n");
+                next = jiffies + 300 * HZ;
+        }
+
+        cb_func(obd, last_rcvd, 0);
+
+        return 0;
+}
+
+static int fsfilt_reiserfs_journal_data(struct file *filp)
+{
+        CERROR("not implemented yet\n");
+        return 0;
+}
+
+static int fsfilt_reiserfs_statfs(struct super_block *sb, struct obd_statfs *osfs)
+{
+        struct statfs sfs;
+        int rc = vfs_statfs(sb, &sfs);
+
+        statfs_pack(osfs, &sfs);
+        return rc;
+}
+
+static struct fsfilt_operations fsfilt_reiserfs_ops = {
+        fs_type:                "reiserfs",
+        fs_owner:               THIS_MODULE,
+        fs_start:               fsfilt_reiserfs_start,
+        fs_brw_start:           fsfilt_reiserfs_brw_start,
+        fs_commit:              fsfilt_reiserfs_commit,
+        fs_setattr:             fsfilt_reiserfs_setattr,
+        fs_set_md:              fsfilt_reiserfs_set_md,
+        fs_get_md:              fsfilt_reiserfs_get_md,
+        fs_readpage:            fsfilt_reiserfs_readpage,
+        fs_journal_data:        fsfilt_reiserfs_journal_data,
+        fs_set_last_rcvd:       fsfilt_reiserfs_set_last_rcvd,
+        fs_statfs:              fsfilt_reiserfs_statfs,
+};
+
+static int __init fsfilt_reiserfs_init(void)
+{
+        return fsfilt_register_ops(&fsfilt_reiserfs_ops);
+}
+
+static void __exit fsfilt_reiserfs_exit(void)
+{
+        fsfilt_unregister_ops(&fsfilt_reiserfs_ops);
+}
+
+MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
+MODULE_DESCRIPTION("Lustre reiserfs Filesystem Helper v0.1");
+MODULE_LICENSE("GPL");
+
+module_init(fsfilt_reiserfs_init);
+module_exit(fsfilt_reiserfs_exit);