+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ *
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program 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 version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Whamcloud, Inc.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/osd/osd_compat.c
+ *
+ * on-disk compatibility stuff for OST
+ *
+ * Author: Alex Zhuravlev <bzzz@whamcloud.com>
+ */
+
+/* LUSTRE_VERSION_CODE */
+#include <lustre_ver.h>
+/* prerequisite for linux/xattr.h */
+#include <linux/types.h>
+/* prerequisite for linux/xattr.h */
+#include <linux/fs.h>
+
+/*
+ * struct OBD_{ALLOC,FREE}*()
+ * OBD_FAIL_CHECK
+ */
+#include <obd_support.h>
+#include <lvfs.h>
+
+#include "osd_internal.h"
+
+struct osd_compat_objid_seq {
+ /* protects on-fly initialization */
+ cfs_semaphore_t dir_init_sem;
+ /* file storing last created objid */
+ struct osd_inode_id last_id;
+ struct dentry *groot; /* O/<seq> */
+ struct dentry **dirs; /* O/<seq>/d0-dXX */
+};
+
+#define MAX_OBJID_GROUP (FID_SEQ_ECHO + 1)
+
+struct osd_compat_objid {
+ int subdir_count;
+ struct dentry *root;
+ struct osd_inode_id last_rcvd_id;
+ struct osd_inode_id last_seq_id;
+ struct osd_compat_objid_seq groups[MAX_OBJID_GROUP];
+};
+
+static void osd_push_ctxt(const struct osd_device *dev,
+ struct lvfs_run_ctxt *newctxt,
+ struct lvfs_run_ctxt *save)
+{
+ OBD_SET_CTXT_MAGIC(newctxt);
+ newctxt->pwdmnt = dev->od_mnt;
+ newctxt->pwd = dev->od_mnt->mnt_root;
+ newctxt->fs = get_ds();
+
+ push_ctxt(save, newctxt, NULL);
+}
+
+void osd_compat_seq_fini(struct osd_device *osd, int seq)
+{
+ struct osd_compat_objid_seq *grp;
+ struct osd_compat_objid *map = osd->od_ost_map;
+ int i;
+
+ ENTRY;
+
+ grp = &map->groups[seq];
+ if (grp->groot ==NULL)
+ RETURN_EXIT;
+ LASSERT(grp->dirs);
+
+ for (i = 0; i < map->subdir_count; i++) {
+ if (grp->dirs[i] == NULL)
+ break;
+ dput(grp->dirs[i]);
+ }
+
+ OBD_FREE(grp->dirs, sizeof(struct dentry *) * map->subdir_count);
+ dput(grp->groot);
+ EXIT;
+}
+
+int osd_compat_seq_init(struct osd_device *osd, int seq)
+{
+ struct osd_compat_objid_seq *grp;
+ struct osd_compat_objid *map;
+ struct dentry *d;
+ int rc = 0;
+ char name[32];
+ int i;
+ ENTRY;
+
+ map = osd->od_ost_map;
+ LASSERT(map);
+ LASSERT(map->root);
+ grp = &map->groups[seq];
+
+ if (grp->groot != NULL)
+ RETURN(0);
+
+ cfs_down(&grp->dir_init_sem);
+
+ sprintf(name, "%d", seq);
+ d = simple_mkdir(map->root, osd->od_mnt, name, 0755, 1);
+ if (IS_ERR(d)) {
+ rc = PTR_ERR(d);
+ GOTO(out, rc);
+ } else if (d->d_inode == NULL) {
+ rc = -EFAULT;
+ dput(d);
+ GOTO(out, rc);
+ }
+
+ LASSERT(grp->dirs == NULL);
+ OBD_ALLOC(grp->dirs, sizeof(d) * map->subdir_count);
+ if (grp->dirs == NULL) {
+ dput(d);
+ GOTO(out, rc = -ENOMEM);
+ }
+
+ grp->groot = d;
+ for (i = 0; i < map->subdir_count; i++) {
+ sprintf(name, "d%d", i);
+ d = simple_mkdir(grp->groot, osd->od_mnt, name, 0755, 1);
+ if (IS_ERR(d)) {
+ rc = PTR_ERR(d);
+ break;
+ } else if (d->d_inode == NULL) {
+ rc = -EFAULT;
+ dput(d);
+ break;
+ }
+
+ grp->dirs[i] = d;
+ }
+
+ if (rc)
+ osd_compat_seq_fini(osd, seq);
+out:
+ cfs_up(&grp->dir_init_sem);
+ RETURN(rc);
+}
+
+int osd_last_rcvd_subdir_count(struct osd_device *osd)
+{
+ struct lr_server_data lsd;
+ struct dentry *dlast;
+ loff_t off;
+ int rc = 0;
+ int count = 0;
+
+ ENTRY;
+
+ dlast = ll_lookup_one_len(LAST_RCVD, osd_sb(osd)->s_root,
+ strlen(LAST_RCVD));
+ if (IS_ERR(dlast))
+ return PTR_ERR(dlast);
+ else if (dlast->d_inode == NULL)
+ goto out;
+
+ off = 0;
+ rc = osd_ldiskfs_read(dlast->d_inode, &lsd, sizeof(lsd), &off);
+ if (rc == sizeof(lsd)) {
+ CDEBUG(D_INFO, "read last_rcvd header, uuid = %s, "
+ "subdir count = %d\n", lsd.lsd_uuid,
+ lsd.lsd_subdir_count);
+ count = le16_to_cpu(lsd.lsd_subdir_count);
+ } else if (rc != 0) {
+ CERROR("Can't read last_rcvd file, rc = %d\n", rc);
+ if (rc > 0)
+ rc = -EFAULT;
+ goto out;
+ } else {
+ count = FILTER_SUBDIR_COUNT;
+ }
+
+ rc = count;
+out:
+ dput(dlast);
+ return rc;
+}
+
+void osd_compat_fini(struct osd_device *dev)
+{
+ int i;
+
+ ENTRY;
+
+ if (dev->od_ost_map == NULL)
+ RETURN_EXIT;
+
+ for (i = 0; i < MAX_OBJID_GROUP; i++)
+ osd_compat_seq_fini(dev, i);
+
+ dput(dev->od_ost_map->root);
+ OBD_FREE_PTR(dev->od_ost_map);
+ dev->od_ost_map = NULL;
+
+ EXIT;
+}
+
+/*
+ * directory structure on legacy OST:
+ *
+ * O/<seq>/d0-31/<objid>
+ * O/<seq>/LAST_ID
+ * last_rcvd
+ * LAST_GROUP
+ * CONFIGS
+ *
+ */
+int osd_compat_init(struct osd_device *dev)
+{
+ struct lvfs_run_ctxt new;
+ struct lvfs_run_ctxt save;
+ struct dentry *rootd = osd_sb(dev)->s_root;
+ struct dentry *d;
+ int rc;
+ int i;
+
+ ENTRY;
+
+ /* to get subdir count from last_rcvd */
+ rc = osd_last_rcvd_subdir_count(dev);
+ if (rc <= 0)
+ RETURN(rc);
+
+ dev->od_ost_map->subdir_count = rc;
+ rc = 0;
+
+ OBD_ALLOC_PTR(dev->od_ost_map);
+ if (dev->od_ost_map == NULL)
+ RETURN(-ENOMEM);
+
+ LASSERT(dev->od_fsops);
+ osd_push_ctxt(dev, &new, &save);
+
+ d = simple_mkdir(rootd, dev->od_mnt, "O", 0755, 1);
+ pop_ctxt(&save, &new, NULL);
+ if (IS_ERR(d)) {
+ OBD_FREE_PTR(dev->od_ost_map);
+ RETURN(PTR_ERR(d));
+ }
+
+ dev->od_ost_map->root = d;
+
+ /* Initialize all groups */
+ for (i = 0; i < MAX_OBJID_GROUP; i++) {
+ cfs_sema_init(&dev->od_ost_map->groups[i].dir_init_sem, 1);
+ rc = osd_compat_seq_init(dev, i);
+ if (rc) {
+ osd_compat_fini(dev);
+ break;
+ }
+ }
+
+ RETURN(rc);
+}
+
+int osd_compat_del_entry(struct osd_thread_info *info, struct osd_device *osd,
+ struct dentry *dird, char *name, struct thandle *th)
+{
+ struct ldiskfs_dir_entry_2 *de;
+ struct buffer_head *bh;
+ struct osd_thandle *oh;
+ struct dentry *child;
+ struct inode *dir = dird->d_inode;
+ int rc;
+
+ ENTRY;
+
+ oh = container_of(th, struct osd_thandle, ot_super);
+ LASSERT(oh->ot_handle != NULL);
+ LASSERT(oh->ot_handle->h_transaction != NULL);
+
+
+ child = &info->oti_child_dentry;
+ child->d_name.hash = 0;
+ child->d_name.name = name;
+ child->d_name.len = strlen(name);
+ child->d_parent = dird;
+ child->d_inode = NULL;
+
+ LOCK_INODE_MUTEX(dir);
+ rc = -ENOENT;
+ bh = osd_ldiskfs_find_entry(dir, child, &de, NULL);
+ if (bh) {
+ rc = ldiskfs_delete_entry(oh->ot_handle, dir, de, bh);
+ brelse(bh);
+ }
+ UNLOCK_INODE_MUTEX(dir);
+
+ RETURN(rc);
+}
+
+int osd_compat_add_entry(struct osd_thread_info *info, struct osd_device *osd,
+ struct dentry *dir, char *name,
+ const struct osd_inode_id *id, struct thandle *th)
+{
+ struct osd_thandle *oh;
+ struct dentry *child;
+ struct inode *inode;
+ int rc;
+
+ ENTRY;
+
+ oh = container_of(th, struct osd_thandle, ot_super);
+ LASSERT(oh->ot_handle != NULL);
+ LASSERT(oh->ot_handle->h_transaction != NULL);
+
+ inode = &info->oti_inode;
+ inode->i_sb = osd_sb(osd);
+ inode->i_ino = id->oii_ino;
+ inode->i_generation = id->oii_gen;
+
+ child = &info->oti_child_dentry;
+ child->d_name.hash = 0;
+ child->d_name.name = name;
+ child->d_name.len = strlen(name);
+ child->d_parent = dir;
+ child->d_inode = inode;
+
+ LOCK_INODE_MUTEX(dir->d_inode);
+ rc = osd_ldiskfs_add_entry(oh->ot_handle, child, inode, NULL);
+ UNLOCK_INODE_MUTEX(dir->d_inode);
+
+ RETURN(rc);
+}
+
+int osd_compat_objid_lookup(struct osd_thread_info *info,
+ struct osd_device *dev, const struct lu_fid *fid,
+ struct osd_inode_id *id)
+{
+ struct osd_compat_objid *map;
+ struct dentry *d;
+ struct dentry *d_seq;
+ struct ost_id *ostid = &info->oti_ostid;
+ int rc = 0;
+ int dirn;
+ char name[32];
+ struct ldiskfs_dir_entry_2 *de;
+ struct buffer_head *bh;
+ struct inode *dir;
+ ENTRY;
+
+ /* on the very first lookup we find and open directories */
+
+ map = dev->od_ost_map;
+ LASSERT(map);
+ LASSERT(map->root);
+
+ fid_ostid_pack(fid, ostid);
+ LASSERT(ostid->oi_seq < MAX_OBJID_GROUP);
+ LASSERT(map->subdir_count > 0);
+ LASSERT(map->groups[ostid->oi_seq].groot);
+
+ dirn = ostid->oi_id & (map->subdir_count - 1);
+ d = map->groups[ostid->oi_seq].dirs[dirn];
+ LASSERT(d);
+
+ sprintf(name, "%llu", ostid->oi_id);
+ d_seq = &info->oti_child_dentry;
+ d_seq->d_parent = d;
+ d_seq->d_name.hash = 0;
+ d_seq->d_name.name = name;
+ /* XXX: we can use rc from sprintf() instead of strlen() */
+ d_seq->d_name.len = strlen(name);
+
+ dir = d->d_inode;
+ LOCK_INODE_MUTEX(dir);
+ bh = osd_ldiskfs_find_entry(dir, d_seq, &de, NULL);
+ UNLOCK_INODE_MUTEX(dir);
+
+ rc = -ENOENT;
+ if (bh) {
+ struct inode *inode;
+
+ id->oii_ino = le32_to_cpu(de->inode);
+ brelse(bh);
+
+ id->oii_gen = OSD_OII_NOGEN;
+ inode = osd_iget(info, dev, id);
+
+ if (IS_ERR(inode))
+ GOTO(cleanup, rc = PTR_ERR(inode));
+ rc = 0;
+ id->oii_gen = inode->i_generation;
+ iput(inode);
+ }
+
+cleanup:
+ RETURN(rc);
+}
+
+int osd_compat_objid_insert(struct osd_thread_info *info,
+ struct osd_device *osd,
+ const struct lu_fid *fid,
+ const struct osd_inode_id *id,
+ struct thandle *th)
+{
+ struct osd_compat_objid *map;
+ struct dentry *d;
+ struct ost_id *ostid = &info->oti_ostid;
+ int dirn, rc = 0;
+ char name[32];
+ ENTRY;
+
+ map = osd->od_ost_map;
+ LASSERT(map);
+ LASSERT(map->root);
+ LASSERT(map->subdir_count > 0);
+ LASSERT(map->groups[ostid->oi_seq].groot);
+
+ /* map fid to group:objid */
+ fid_ostid_pack(fid, ostid);
+ dirn = ostid->oi_id & (map->subdir_count - 1);
+ d = map->groups[ostid->oi_seq].dirs[dirn];
+ LASSERT(d);
+
+ sprintf(name, "%llu", ostid->oi_id);
+ rc = osd_compat_add_entry(info, osd, d, name, id, th);
+
+ RETURN(rc);
+}
+
+int osd_compat_objid_delete(struct osd_thread_info *info,
+ struct osd_device *osd,
+ const struct lu_fid *fid, struct thandle *th)
+{
+ struct osd_compat_objid *map;
+ struct dentry *d;
+ struct ost_id *ostid = &info->oti_ostid;
+ int dirn, rc = 0;
+ char name[32];
+ ENTRY;
+
+ map = osd->od_ost_map;
+ LASSERT(map);
+ LASSERT(map->root);
+ LASSERT(map->subdir_count > 0);
+ LASSERT(map->groups[ostid->oi_seq].groot);
+
+ /* map fid to group:objid */
+ fid_ostid_pack(fid, ostid);
+ dirn = ostid->oi_id & (map->subdir_count - 1);
+ d = map->groups[ostid->oi_seq].dirs[dirn];
+ LASSERT(d);
+
+ sprintf(name, "%llu", ostid->oi_id);
+ rc = osd_compat_del_entry(info, osd, d, name, th);
+
+ RETURN(rc);
+}
+
+struct named_oid {
+ unsigned long oid;
+ char *name;
+};
+
+static const struct named_oid oids[] = {
+ { FLD_INDEX_OID, "" /* "fld" */ },
+ { FID_SEQ_CTL_OID, "" /* "seq_ctl" */ },
+ { FID_SEQ_SRV_OID, "" /* "seq_srv" */ },
+ { MDD_ROOT_INDEX_OID, "" /* "ROOT" */ },
+ { MDD_ORPHAN_OID, "" /* "PENDING" */ },
+ { MDD_LOV_OBJ_OID, "" /* LOV_OBJID */ },
+ { MDD_CAPA_KEYS_OID, "" /* CAPA_KEYS */ },
+ { MDT_LAST_RECV_OID, "" /* LAST_RCVD */ },
+ { OFD_LAST_RECV_OID, "" /* LAST_RCVD */ },
+ { OFD_LAST_GROUP_OID, "" /* "LAST_GROUP" */ },
+ { LLOG_CATALOGS_OID, "" /* "CATALOGS" */ },
+ { MGS_CONFIGS_OID, "" /* MOUNT_CONFIGS_DIR */ },
+ { OFD_HEALTH_CHECK_OID, "" /* HEALTH_CHECK */ },
+ { 0, NULL }
+};
+
+static char *oid2name(const unsigned long oid)
+{
+ int i = 0;
+
+ while (oids[i].oid) {
+ if (oids[i].oid == oid)
+ return oids[i].name;
+ i++;
+ }
+ return NULL;
+}
+
+int osd_compat_spec_insert(struct osd_thread_info *info,
+ struct osd_device *osd, const struct lu_fid *fid,
+ const struct osd_inode_id *id, struct thandle *th)
+{
+ struct osd_compat_objid *map = osd->od_ost_map;
+ struct dentry *root = osd_sb(osd)->s_root;
+ char *name;
+ int rc = 0;
+ int seq;
+ ENTRY;
+
+ if (fid_oid(fid) >= OFD_GROUP0_LAST_OID &&
+ fid_oid(fid) < OFD_GROUP4K_LAST_OID) {
+ /* on creation of LAST_ID we create O/<group> hierarchy */
+ LASSERT(map);
+ seq = fid_oid(fid) - OFD_GROUP0_LAST_OID;
+ LASSERT(seq < MAX_OBJID_GROUP);
+ LASSERT(map->groups[seq].groot);
+ } else {
+ name = oid2name(fid_oid(fid));
+ if (name == NULL)
+ CWARN("UNKNOWN COMPAT FID "DFID"\n", PFID(fid));
+ else if (name[0])
+ rc = osd_compat_add_entry(info, osd, root, name, id,
+ th);
+ }
+
+ RETURN(rc);
+}
+
+int osd_compat_spec_lookup(struct osd_thread_info *info,
+ struct osd_device *osd, const struct lu_fid *fid,
+ struct osd_inode_id *id)
+{
+ struct dentry *dentry;
+ char *name;
+ int rc = -ERESTART;
+
+ ENTRY;
+
+ name = oid2name(fid_oid(fid));
+ if (name == NULL || strlen(name) == 0)
+ return -ERESTART;
+
+ dentry = ll_lookup_one_len(name, osd_sb(osd)->s_root, strlen(name));
+ if (!IS_ERR(dentry)) {
+ if (dentry->d_inode) {
+ if (is_bad_inode(dentry->d_inode)) {
+ rc = -EIO;
+ } else {
+ id->oii_ino = dentry->d_inode->i_ino;
+ id->oii_gen = dentry->d_inode->i_generation;
+ rc = 0;
+ }
+ }
+ dput(dentry);
+ }
+
+ RETURN(rc);
+}
+
git://git.whamcloud.com / fs / lustre-release.git / commitdiff