/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
- * linux/mds/mds_ext3.c
- *
+ * lustre/mds/mds_ext3.c
* Lustre Metadata Server (mds) journal abstraction routines
*
- * Copyright (C) 2002 Cluster File Systems, Inc.
- * author: Andreas Dilger <adilger@clusterfs.com>
+ * 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.
*
- * This code is issued under the GNU General Public License.
- * See the file COPYING in this distribution
+ * 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.
*/
#define DEBUG_SUBSYSTEM S_MDS
#include <linux/fs.h>
#include <linux/jbd.h>
+#include <linux/slab.h>
+#include <linux/init.h>
#include <linux/ext3_fs.h>
#include <linux/ext3_jbd.h>
+#include <../fs/ext3/xattr.h>
+#include <linux/kp30.h>
#include <linux/lustre_mds.h>
+#include <linux/obd.h>
+#include <linux/module.h>
+#include <linux/obd_lov.h>
+
+static struct mds_fs_operations mds_ext3_fs_ops;
+static kmem_cache_t *mcb_cache;
+static int mcb_cache_count;
+
+struct mds_cb_data {
+ struct journal_callback cb_jcb;
+ struct mds_obd *cb_mds;
+ __u64 cb_last_rcvd;
+};
+
+#define EXT3_XATTR_INDEX_LUSTRE 5
+#define XATTR_LUSTRE_MDS_OBJID "system.lustre_mds_objid"
+
+#define XATTR_MDS_MO_MAGIC 0xEA0BD047
/*
* We don't currently need any additional blocks for rmdir and
{
/* For updates to the last recieved file */
int nblocks = EXT3_DATA_TRANS_BLOCKS;
+ void *handle;
switch(op) {
case MDS_FSOP_RMDIR:
case MDS_FSOP_UNLINK:
- nblocks += EXT3_DELETE_TRANS_BLOCKS; break;
+ nblocks += EXT3_DELETE_TRANS_BLOCKS;
+ break;
case MDS_FSOP_RENAME:
+ /* We may be modifying two directories */
nblocks += EXT3_DATA_TRANS_BLOCKS;
+ case MDS_FSOP_SYMLINK:
+ /* Possible new block + block bitmap + GDT for long symlink */
+ nblocks += 3;
case MDS_FSOP_CREATE:
- // FIXME: when we store oa_id in an EA we need more blocks
- // nblocks += 0;
case MDS_FSOP_MKDIR:
- case MDS_FSOP_SYMLINK:
- /* Create new directory or symlink (more data blocks) */
- nblocks += 2;
case MDS_FSOP_MKNOD:
- /* Change parent directory + setattr on new inode */
- nblocks += EXT3_DATA_TRANS_BLOCKS + 3;
+ /* New inode + block bitmap + GDT for new file */
+ nblocks += 3;
+ case MDS_FSOP_LINK:
+ /* Change parent directory */
+ nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS+EXT3_DATA_TRANS_BLOCKS;
+ break;
+ case MDS_FSOP_SETATTR:
+ /* Setattr on inode */
+ nblocks += 1;
+ break;
+ default: CERROR("unknown transaction start op %d\n", op);
+ LBUG();
}
- return journal_start(EXT3_JOURNAL(inode), nblocks);
+ lock_kernel();
+ handle = journal_start(EXT3_JOURNAL(inode), nblocks);
+ unlock_kernel();
+
+ return handle;
}
static int mds_ext3_commit(struct inode *inode, void *handle)
{
- return journal_stop((handle_t *)handle);
+ int rc;
+
+ lock_kernel();
+ rc = journal_stop((handle_t *)handle);
+ unlock_kernel();
+
+ return rc;
}
static int mds_ext3_setattr(struct dentry *dentry, void *handle,
struct iattr *iattr)
{
struct inode *inode = dentry->d_inode;
+ int rc;
- /* a _really_ horrible hack to avoid removing the data stored
- in the block pointers; this data is the object id
- this will go into an extended attribute at some point.
- */
- if ( iattr->ia_valid & ATTR_SIZE ) {
- /* ATTR_SIZE would invoke truncate: clear it */
- iattr->ia_valid &= ~ATTR_SIZE;
- inode->i_size = iattr->ia_size;
-
- /* an _even_more_ horrible hack to make this hack work with
- * ext3. This is because ext3 keeps a separate inode size
- * until the inode is committed to ensure consistency. This
- * will also go away with the move to EAs.
- */
- EXT3_I(inode)->i_disksize = inode->i_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;
- }
- }
-
+ lock_kernel();
if (inode->i_op->setattr)
- return inode->i_op->setattr(dentry, iattr);
+ rc = inode->i_op->setattr(dentry, iattr);
else
- return inode_setattr(inode, iattr);
+ rc = inode_setattr(inode, iattr);
+
+ unlock_kernel();
+
+ return rc;
}
-/*
- * FIXME: nasty hack - store the object id in the first two
- * direct block spots. This should be done with EAs...
- * Note also that this does not currently mark the inode
- * dirty (it currently is used with other operations that
- * subsequently also mark the inode dirty).
- */
-#define EXT3_OBJID_FL 0x40000000
-static int mds_ext3_set_objid(struct inode *inode, void *handle, obd_id id)
+static int mds_ext3_set_md(struct inode *inode, void *handle,
+ struct lov_mds_md *lmm)
{
- memcpy(&EXT3_I(inode)->i_data, &id, sizeof(id));
- EXT3_I(inode)->i_flags |= EXT3_OBJID_FL;
- return 0;
+ int rc;
+
+ down(&inode->i_sem);
+ lock_kernel();
+ rc = ext3_xattr_set(handle, inode, EXT3_XATTR_INDEX_LUSTRE,
+ XATTR_LUSTRE_MDS_OBJID, lmm,
+ lmm ? lmm->lmm_easize : 0, 0);
+ unlock_kernel();
+ up(&inode->i_sem);
+
+ if (rc) {
+ CERROR("error adding objectid "LPX64" to inode %ld: %d\n",
+ lmm->lmm_object_id, inode->i_ino, rc);
+ if (rc != -ENOSPC) LBUG();
+ }
+ return rc;
}
-static void mds_ext3_get_objid(struct inode *inode, obd_id *id)
+static int mds_ext3_get_md(struct inode *inode, struct lov_mds_md *lmm)
{
- memcpy(id, &EXT3_I(inode)->i_data, sizeof(*id));
+ int rc;
+ int size = lmm->lmm_easize;
+
+ down(&inode->i_sem);
+ lock_kernel();
+ rc = ext3_xattr_get(inode, EXT3_XATTR_INDEX_LUSTRE,
+ XATTR_LUSTRE_MDS_OBJID, lmm, size);
+ unlock_kernel();
+ up(&inode->i_sem);
+
+ /* This gives us the MD size */
+ if (lmm == NULL)
+ return rc;
+
+ if (rc < 0) {
+ CDEBUG(D_INFO, "error getting EA %s from MDS inode %ld: "
+ "rc = %d\n", XATTR_LUSTRE_MDS_OBJID, inode->i_ino, rc);
+ memset(lmm, 0, size);
+ return rc;
+ }
+
+ /* This field is byteswapped because it appears in the
+ * catalogue. All others are opaque to the MDS */
+ lmm->lmm_object_id = le64_to_cpu(lmm->lmm_object_id);
+
+ return rc;
}
static ssize_t mds_ext3_readpage(struct file *file, char *buf, size_t count,
return rc;
}
-struct mds_fs_operations mds_ext3_fs_ops;
-
-void mds_ext3_delete_inode(struct inode * inode)
+static void mds_ext3_delete_inode(struct inode *inode)
{
- void *handle;
-
- if (EXT3_I(inode)->i_flags & EXT3_OBJID_FL) {
- handle = mds_ext3_start(inode, MDS_FSOP_UNLINK);
+ if (S_ISREG(inode->i_mode)) {
+ void *handle = mds_ext3_start(inode, MDS_FSOP_UNLINK);
if (IS_ERR(handle)) {
CERROR("unable to start transaction");
EXIT;
return;
}
- if (mds_ext3_set_objid(inode, handle, 0))
+ if (mds_ext3_set_md(inode, handle, NULL))
CERROR("error clearing objid on %ld\n", inode->i_ino);
if (mds_ext3_fs_ops.cl_delete_inode)
mds_ext3_fs_ops.cl_delete_inode(inode);
}
-struct mds_fs_operations mds_ext3_fs_ops = {
- fs_start: mds_ext3_start,
- fs_commit: mds_ext3_commit,
- fs_setattr: mds_ext3_setattr,
- fs_set_objid: mds_ext3_set_objid,
- fs_get_objid: mds_ext3_get_objid,
- fs_readpage: mds_ext3_readpage,
- fs_delete_inode:mds_ext3_delete_inode,
- cl_delete_inode:clear_inode,
+static void mds_ext3_callback_status(struct journal_callback *jcb, int error)
+{
+ struct mds_cb_data *mcb = (struct mds_cb_data *)jcb;
+
+ CDEBUG(D_EXT2, "got callback for last_rcvd "LPD64": rc = %d\n",
+ mcb->cb_last_rcvd, error);
+ if (!error && mcb->cb_last_rcvd > mcb->cb_mds->mds_last_committed)
+ mcb->cb_mds->mds_last_committed = mcb->cb_last_rcvd;
+
+ kmem_cache_free(mcb_cache, mcb);
+ --mcb_cache_count;
+}
+
+static int mds_ext3_set_last_rcvd(struct mds_obd *mds, void *handle)
+{
+ struct mds_cb_data *mcb;
+
+ mcb = kmem_cache_alloc(mcb_cache, GFP_NOFS);
+ if (!mcb)
+ RETURN(-ENOMEM);
+
+ ++mcb_cache_count;
+ mcb->cb_mds = mds;
+ mcb->cb_last_rcvd = mds->mds_last_rcvd;
+
+#ifdef HAVE_JOURNAL_CALLBACK_STATUS
+ CDEBUG(D_EXT2, "set callback for last_rcvd: "LPD64"\n",
+ mcb->cb_last_rcvd);
+ lock_kernel();
+ /* Note that an "incompatible pointer" warning here is OK for now */
+ journal_callback_set(handle, mds_ext3_callback_status,
+ (struct journal_callback *)mcb);
+ unlock_kernel();
+#else
+#warning "no journal callback kernel patch, faking it..."
+ {
+ static long next = 0;
+
+ if (time_after(jiffies, next)) {
+ CERROR("no journal callback kernel patch, faking it...\n");
+ next = jiffies + 300 * HZ;
+ }
+
+ mds_ext3_callback_status((struct journal_callback *)mcb, 0);
+#endif
+
+ return 0;
+}
+
+static int mds_ext3_journal_data(struct file *filp)
+{
+ struct inode *inode = filp->f_dentry->d_inode;
+
+ EXT3_I(inode)->i_flags |= EXT3_JOURNAL_DATA_FL;
+
+ return 0;
+}
+
+/*
+ * We need to hack the return value for the free inode counts because
+ * the current EA code requires one filesystem block per inode with EAs,
+ * so it is possible to run out of blocks before we run out of inodes.
+ *
+ * This can be removed when the ext3 EA code is fixed.
+ */
+static int mds_ext3_statfs(struct super_block *sb, struct statfs *sfs)
+{
+ int rc = vfs_statfs(sb, sfs);
+
+ if (!rc && sfs->f_bfree < sfs->f_ffree)
+ sfs->f_ffree = sfs->f_bfree;
+
+ return rc;
+}
+
+static struct mds_fs_operations mds_ext3_fs_ops = {
+ fs_owner: THIS_MODULE,
+ fs_start: mds_ext3_start,
+ fs_commit: mds_ext3_commit,
+ fs_setattr: mds_ext3_setattr,
+ fs_set_md: mds_ext3_set_md,
+ fs_get_md: mds_ext3_get_md,
+ fs_readpage: mds_ext3_readpage,
+ fs_delete_inode: mds_ext3_delete_inode,
+ cl_delete_inode: clear_inode,
+ fs_journal_data: mds_ext3_journal_data,
+ fs_set_last_rcvd: mds_ext3_set_last_rcvd,
+ fs_statfs: mds_ext3_statfs,
};
+
+static int __init mds_ext3_init(void)
+{
+ int rc;
+
+ //rc = ext3_xattr_register();
+ mcb_cache = kmem_cache_create("mds_ext3_mcb",
+ sizeof(struct mds_cb_data), 0,
+ 0, NULL, NULL);
+ if (!mcb_cache) {
+ CERROR("error allocating MDS journal callback cache\n");
+ GOTO(out, rc = -ENOMEM);
+ }
+
+ rc = mds_register_fs_type(&mds_ext3_fs_ops, "ext3");
+
+ if (rc)
+ kmem_cache_destroy(mcb_cache);
+out:
+ return rc;
+}
+
+static void __exit mds_ext3_exit(void)
+{
+ int rc;
+
+ mds_unregister_fs_type("ext3");
+ rc = kmem_cache_destroy(mcb_cache);
+
+ if (rc || mcb_cache_count) {
+ CERROR("can't free MDS callback cache: count %d, rc = %d\n",
+ mcb_cache_count, rc);
+ }
+
+ //rc = ext3_xattr_unregister();
+}
+
+MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
+MODULE_DESCRIPTION("Lustre MDS ext3 Filesystem Helper v0.1");
+MODULE_LICENSE("GPL");
+
+module_init(mds_ext3_init);
+module_exit(mds_ext3_exit);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff