--- /dev/null
+/*
+ * 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) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ */
+/*
+ * Copyright (c) 2011, 2012 Whamcloud, Inc.
+ * Use is subject to license terms.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/osd-zfs/osd_oi.c
+ * OI functions to map fid to dnode
+ *
+ * Author: Alex Zhuravlev <bzzz@whamcloud.com>
+ * Author: Mike Pershin <tappro@whamcloud.com>
+ */
+
+#ifndef EXPORT_SYMTAB
+# define EXPORT_SYMTAB
+#endif
+#define DEBUG_SUBSYSTEM S_OSD
+
+#include <lustre_ver.h>
+#include <libcfs/libcfs.h>
+#include <obd_support.h>
+#include <lustre_net.h>
+#include <obd.h>
+#include <obd_class.h>
+#include <lustre_disk.h>
+#include <lustre_fid.h>
+
+#include "osd_internal.h"
+
+#include <sys/dnode.h>
+#include <sys/dbuf.h>
+#include <sys/spa.h>
+#include <sys/stat.h>
+#include <sys/zap.h>
+#include <sys/spa_impl.h>
+#include <sys/zfs_znode.h>
+#include <sys/dmu_tx.h>
+#include <sys/dmu_objset.h>
+#include <sys/dsl_prop.h>
+#include <sys/sa_impl.h>
+#include <sys/txg.h>
+
+static char *oi_tag = "osd_mount, oi";
+
+#define OSD_OI_FID_NR (1UL << 7)
+#define OSD_OI_FID_NR_MAX (1UL << OSD_OI_FID_OID_BITS_MAX)
+unsigned int osd_oi_count = OSD_OI_FID_NR;
+
+
+/*
+ * zfs osd maintains names for known fids in the name hierarchy
+ * so that one can mount filesystem with regular ZFS stack and
+ * access files
+ */
+struct named_oid {
+ unsigned long oid;
+ char *name;
+};
+
+static const struct named_oid oids[] = {
+ { OFD_LAST_RECV_OID, LAST_RCVD },
+ { OFD_LAST_GROUP_OID, "LAST_GROUP" },
+ { LLOG_CATALOGS_OID, "CATALOGS" },
+ { MGS_CONFIGS_OID, MOUNT_CONFIGS_DIR },
+ { FID_SEQ_SRV_OID, "seq_srv" },
+ { FID_SEQ_CTL_OID, "seq_ctl" },
+ { MDD_CAPA_KEYS_OID, CAPA_KEYS },
+ { FLD_INDEX_OID, "fld" },
+ { MDD_LOV_OBJ_OID, LOV_OBJID },
+ { MDT_LAST_RECV_OID, LAST_RCVD },
+ { OFD_HEALTH_CHECK_OID, HEALTH_CHECK },
+ { OFD_GROUP0_LAST_OID, "LAST_ID" },
+ { ACCT_USER_OID, "acct_usr_inode" },
+ { ACCT_GROUP_OID, "acct_grp_inode" },
+ { MDD_ROOT_INDEX_OID, NULL },
+ { MDD_ORPHAN_OID, NULL },
+ { 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;
+}
+
+/*
+ * objects w/o a natural reference (unlike a file on a MDS)
+ * are put under a special hierarchy /O/<seq>/d0..dXX
+ * this function returns a directory specific fid belongs to
+ */
+static uint64_t
+osd_get_idx_for_ost_obj(const struct lu_env *env, struct osd_device *osd,
+ const struct lu_fid *fid, char *buf)
+{
+ unsigned long b;
+ int rc;
+
+ rc = fid_ostid_pack(fid, &osd_oti_get(env)->oti_ostid);
+ LASSERT(rc == 0); /* we should not get here with IGIF */
+ b = osd_oti_get(env)->oti_ostid.oi_id % OSD_OST_MAP_SIZE;
+ LASSERT(osd->od_ost_compat_dirs[b]);
+
+ sprintf(buf, LPU64, osd_oti_get(env)->oti_ostid.oi_id);
+
+ return osd->od_ost_compat_dirs[b];
+}
+
+/* XXX: f_ver is not counted, but may differ too */
+static void osd_fid2str(char *buf, const struct lu_fid *fid)
+{
+ sprintf(buf, DFID_NOBRACE, PFID(fid));
+}
+
+/*
+ * Determine the zap object id which is being used as the OI for the
+ * given fid. The lowest N bits in the sequence ID are used as the
+ * index key. On failure 0 is returned which zfs treats internally
+ * as an invalid object id.
+ */
+static uint64_t
+osd_get_idx_for_fid(struct osd_device *osd, const struct lu_fid *fid,
+ char *buf)
+{
+ struct osd_oi *oi;
+
+ LASSERT(osd->od_oi_table != NULL);
+ oi = osd->od_oi_table[fid_seq(fid) & (osd->od_oi_count - 1)];
+ osd_fid2str(buf, fid);
+
+ return oi->oi_zapid;
+}
+
+uint64_t osd_get_name_n_idx(const struct lu_env *env, struct osd_device *osd,
+ const struct lu_fid *fid, char *buf)
+{
+ uint64_t zapid;
+
+ LASSERT(fid);
+ LASSERT(buf);
+
+ if (fid_is_idif(fid)) {
+ zapid = osd_get_idx_for_ost_obj(env, osd, fid, buf);
+ } else if (unlikely(fid_seq(fid) == FID_SEQ_LOCAL_FILE)) {
+ /* special objects with fixed known fids get their name */
+ char *name = oid2name(fid_oid(fid));
+
+ if (name) {
+ zapid = osd->od_root;
+ strcpy(buf, name);
+ if (fid_oid(fid) == OFD_GROUP0_LAST_OID)
+ zapid = osd->od_ost_compat_grp0;
+ else if (fid_is_acct(fid))
+ zapid = MASTER_NODE_OBJ;
+ } else {
+ zapid = osd_get_idx_for_fid(osd, fid, buf);
+ }
+ } else {
+ zapid = osd_get_idx_for_fid(osd, fid, buf);
+ }
+
+ return zapid;
+}
+
+static inline int fid_is_fs_root(const struct lu_fid *fid)
+{
+ /* Map root inode to special local object FID */
+ return fid_seq(fid) == FID_SEQ_LOCAL_FILE &&
+ fid_oid(fid) == OSD_FS_ROOT_OID;
+}
+
+int osd_fid_lookup(const struct lu_env *env, struct osd_device *dev,
+ const struct lu_fid *fid, uint64_t *oid)
+{
+ struct osd_thread_info *info = osd_oti_get(env);
+ char *buf = info->oti_buf;
+ uint64_t zapid;
+ int rc = 0;
+ ENTRY;
+
+ if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOENT))
+ RETURN(-ENOENT);
+
+ if (unlikely(fid_is_acct(fid))) {
+ if (fid_oid(fid) == ACCT_USER_OID)
+ *oid = dev->od_iusr_oid;
+ else
+ *oid = dev->od_igrp_oid;
+ } else if (unlikely(fid_is_fs_root(fid))) {
+ *oid = dev->od_root;
+ } else {
+ zapid = osd_get_name_n_idx(env, dev, fid, buf);
+
+ rc = -zap_lookup(dev->od_objset.os, zapid, buf,
+ 8, 1, &info->oti_zde);
+ if (rc)
+ RETURN(rc);
+ *oid = info->oti_zde.lzd_reg.zde_dnode;
+ }
+
+ RETURN(rc);
+}
+
+/**
+ * Lookup an existing OI by the given name.
+ */
+static int
+osd_oi_lookup(const struct lu_env *env, struct osd_device *o,
+ uint64_t parent, const char *name, struct osd_oi *oi)
+{
+ struct zpl_direntry *zde = &osd_oti_get(env)->oti_zde.lzd_reg;
+ int rc;
+
+ rc = -zap_lookup(o->od_objset.os, parent, name, 8, 1, (void *)zde);
+ if (rc)
+ return rc;
+
+ strncpy(oi->oi_name, name, OSD_OI_NAME_SIZE - 1);
+ oi->oi_zapid = zde->zde_dnode;
+
+ return rc;
+}
+
+/**
+ * Create a new OI with the given name.
+ */
+static int
+osd_oi_create(const struct lu_env *env, struct osd_device *o,
+ uint64_t parent, const char *name, uint64_t *child)
+{
+ struct zpl_direntry *zde = &osd_oti_get(env)->oti_zde.lzd_reg;
+ struct lu_attr *la = &osd_oti_get(env)->oti_la;
+ dmu_buf_t *db;
+ dmu_tx_t *tx;
+ int rc;
+
+ /* verify it doesn't already exist */
+ rc = -zap_lookup(o->od_objset.os, parent, name, 8, 1, (void *)zde);
+ if (rc == 0)
+ return -EEXIST;
+
+ /* create fid-to-dnode index */
+ tx = dmu_tx_create(o->od_objset.os);
+ if (tx == NULL)
+ return -ENOMEM;
+
+ dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, 1, NULL);
+ dmu_tx_hold_bonus(tx, parent);
+ dmu_tx_hold_zap(tx, parent, TRUE, name);
+ LASSERT(tx->tx_objset->os_sa);
+ dmu_tx_hold_sa_create(tx, ZFS_SA_BASE_ATTR_SIZE);
+
+ rc = -dmu_tx_assign(tx, TXG_WAIT);
+ if (rc) {
+ dmu_tx_abort(tx);
+ return rc;
+ }
+
+ la->la_valid = LA_MODE | LA_UID | LA_GID;
+ la->la_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO;
+ la->la_uid = la->la_gid = 0;
+ __osd_zap_create(env, &o->od_objset, &db, tx, la, oi_tag, 0);
+
+ zde->zde_dnode = db->db_object;
+ zde->zde_pad = 0;
+ zde->zde_type = IFTODT(S_IFDIR);
+
+ rc = -zap_add(o->od_objset.os, parent, name, 8, 1, (void *)zde, tx);
+
+ dmu_tx_commit(tx);
+
+ *child = db->db_object;
+ sa_buf_rele(db, oi_tag);
+
+ return rc;
+}
+
+static int
+osd_oi_find_or_create(const struct lu_env *env, struct osd_device *o,
+ uint64_t parent, const char *name, uint64_t *child)
+{
+ struct osd_oi oi;
+ int rc;
+
+ rc = osd_oi_lookup(env, o, parent, name, &oi);
+ if (rc == 0) {
+ *child = oi.oi_zapid;
+ } else if (rc == -ENOENT) {
+ rc = osd_oi_create(env, o, parent, name, child);
+ }
+
+ return rc;
+}
+
+/**
+ * Close an entry in a specific slot.
+ */
+static void
+osd_oi_remove_table(const struct lu_env *env, struct osd_device *o, int key)
+{
+ struct osd_oi *oi;
+
+ LASSERT(key < o->od_oi_count);
+
+ oi = o->od_oi_table[key];
+ if (oi) {
+ OBD_FREE_PTR(oi);
+ o->od_oi_table[key] = NULL;
+ }
+}
+
+/**
+ * Allocate and open a new entry in the specified unused slot.
+ */
+static int
+osd_oi_add_table(const struct lu_env *env, struct osd_device *o,
+ char *name, int key)
+{
+ struct osd_oi *oi;
+ int rc;
+
+ LASSERT(key < o->od_oi_count);
+ LASSERT(o->od_oi_table[key] == NULL);
+
+ OBD_ALLOC_PTR(oi);
+ if (oi == NULL)
+ return -ENOMEM;
+
+ rc = osd_oi_lookup(env, o, o->od_root, name, oi);
+ if (rc) {
+ OBD_FREE_PTR(oi);
+ return rc;
+ }
+
+ o->od_oi_table[key] = oi;
+
+ return 0;
+}
+
+/**
+ * Depopulate the OI table.
+ */
+static void
+osd_oi_close_table(const struct lu_env *env, struct osd_device *o)
+{
+ int i;
+
+ for (i = 0; i < o->od_oi_count; i++)
+ osd_oi_remove_table(env, o, i);
+}
+
+/**
+ * Populate the OI table based.
+ */
+static int
+osd_oi_open_table(const struct lu_env *env, struct osd_device *o, int count)
+{
+ char name[16];
+ int i, rc = 0;
+ ENTRY;
+
+ for (i = 0; i < count; i++) {
+ sprintf(name, "%s.%d", DMU_OSD_OI_NAME_BASE, i);
+ rc = osd_oi_add_table(env, o, name, i);
+ if (rc) {
+ osd_oi_close_table(env, o);
+ break;
+ }
+ }
+
+ RETURN(rc);
+}
+
+/**
+ * Determine if the type and number of OIs used by this file system.
+ */
+static int
+osd_oi_probe(const struct lu_env *env, struct osd_device *o, int *count)
+{
+ uint64_t root_oid = o->od_root;
+ struct osd_oi oi;
+ char name[16];
+ int rc;
+ ENTRY;
+
+ /*
+ * Check for multiple OIs and determine the count. There is no
+ * gap handling, if an OI is missing the wrong size can be returned.
+ * The only safeguard is that we know the number of OIs must be a
+ * power of two and this is checked for basic sanity.
+ */
+ for (*count = 0; *count < OSD_OI_FID_NR_MAX; (*count)++) {
+ sprintf(name, "%s.%d", DMU_OSD_OI_NAME_BASE, *count);
+ rc = osd_oi_lookup(env, o, root_oid, name, &oi);
+ if (rc == 0)
+ continue;
+
+ if (rc == -ENOENT) {
+ if (*count == 0)
+ break;
+
+ if ((*count & (*count - 1)) != 0)
+ RETURN(-EDOM);
+
+ RETURN(0);
+ }
+
+ RETURN(rc);
+ }
+
+ /*
+ * No OIs exist, this must be a new filesystem.
+ */
+ *count = 0;
+
+ RETURN(0);
+}
+
+/**
+ * Create /O subdirectory to map legacy OST objects for compatibility.
+ */
+static int
+osd_oi_init_compat(const struct lu_env *env, struct osd_device *o)
+{
+ char *key = osd_oti_get(env)->oti_buf;
+ uint64_t odb, sdb;
+ int i, rc;
+ ENTRY;
+
+ rc = osd_oi_find_or_create(env, o, o->od_root, "O", &sdb);
+ if (rc)
+ RETURN(rc);
+
+ /* create /O/0 subdirectory to map legacy OST objects */
+ rc = osd_oi_find_or_create(env, o, sdb, "0", &odb);
+ if (rc)
+ RETURN(rc);
+
+ o->od_ost_compat_grp0 = odb;
+
+ for (i = 0; i < OSD_OST_MAP_SIZE; i++) {
+ sprintf(key, "d%d", i);
+ rc = osd_oi_find_or_create(env, o, odb, key, &sdb);
+ if (rc)
+ RETURN(rc);
+
+ o->od_ost_compat_dirs[i] = sdb;
+ }
+
+ /* Create on-disk indexes to maintain per-UID/GID inode usage.
+ * Those new indexes are created in the top-level ZAP outside the
+ * namespace in order not to confuse ZPL which might interpret those
+ * indexes as directories and assume the values are object IDs */
+ rc = osd_oi_find_or_create(env, o, MASTER_NODE_OBJ,
+ oid2name(ACCT_USER_OID), &odb);
+ if (rc)
+ RETURN(rc);
+ o->od_iusr_oid = odb;
+
+ rc = osd_oi_find_or_create(env, o, MASTER_NODE_OBJ,
+ oid2name(ACCT_GROUP_OID), &odb);
+ if (rc)
+ RETURN(rc);
+ o->od_igrp_oid = odb;
+
+ RETURN(rc);
+}
+
+/**
+ * Initialize the OIs by either opening or creating them as needed.
+ */
+int osd_oi_init(const struct lu_env *env, struct osd_device *o)
+{
+ char *key = osd_oti_get(env)->oti_buf;
+ int i, rc, count = 0;
+ ENTRY;
+
+ rc = osd_oi_probe(env, o, &count);
+ if (rc)
+ RETURN(rc);
+
+ if (count == 0) {
+ uint64_t odb, sdb;
+
+ count = osd_oi_count;
+ odb = o->od_root;
+
+ for (i = 0; i < count; i++) {
+ sprintf(key, "%s.%d", DMU_OSD_OI_NAME_BASE, i);
+ rc = osd_oi_find_or_create(env, o, odb, key, &sdb);
+ if (rc)
+ RETURN(rc);
+ }
+ }
+
+ rc = osd_oi_init_compat(env, o);
+ if (rc)
+ RETURN(rc);
+
+ LASSERT((count & (count - 1)) == 0);
+ o->od_oi_count = count;
+ OBD_ALLOC(o->od_oi_table, sizeof(struct osd_oi *) * count);
+ if (o->od_oi_table == NULL)
+ RETURN(-ENOMEM);
+
+ rc = osd_oi_open_table(env, o, count);
+ if (rc) {
+ OBD_FREE(o->od_oi_table, sizeof(struct osd_oi *) * count);
+ o->od_oi_table = NULL;
+ }
+
+ RETURN(rc);
+}
+
+void osd_oi_fini(const struct lu_env *env, struct osd_device *o)
+{
+ ENTRY;
+
+ if (o->od_oi_table != NULL) {
+ (void) osd_oi_close_table(env, o);
+ OBD_FREE(o->od_oi_table,
+ sizeof(struct osd_oi *) * o->od_oi_count);
+ o->od_oi_table = NULL;
+ o->od_oi_count = 0;
+ }
+
+ EXIT;
+}
+
+int osd_options_init(void)
+{
+ /* osd_oi_count - Default number of OIs, 128 works well for ZFS */
+ if (osd_oi_count == 0 || osd_oi_count > OSD_OI_FID_NR_MAX)
+ osd_oi_count = OSD_OI_FID_NR;
+
+ if ((osd_oi_count & (osd_oi_count - 1)) != 0) {
+ LCONSOLE_WARN("Round up osd_oi_count %d to power2 %d\n",
+ osd_oi_count, size_roundup_power2(osd_oi_count));
+ osd_oi_count = size_roundup_power2(osd_oi_count);
+ }
+
+ return 0;
+}
+
+
git://git.whamcloud.com / fs / lustre-release.git / commitdiff