-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
+/*
+ * GPL HEADER START
*
- * Copyright (C) 2001-2003 Cluster File Systems, Inc.
- * Author: Andreas Dilger <adilger@clusterfs.com>
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
- * This file is part of the Lustre file system, http://www.lustre.org
- * Lustre is a trademark of Cluster File Systems, Inc.
+ * 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.
*
- * You may have signed or agreed to another license before downloading
- * this software. If so, you are bound by the terms and conditions
- * of that agreement, and the following does not apply to you. See the
- * LICENSE file included with this distribution for more information.
+ * 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).
*
- * If you did not agree to a different license, then this copy of Lustre
- * is open source 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.
+ * 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
*
- * In either case, 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
- * license text for more details.
+ * 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.
*
- * OST<->MDS recovery logging infrastructure.
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2012, 2015, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/obdclass/llog.c
*
+ * OST<->MDS recovery logging infrastructure.
* Invariants in implementation:
* - we do not share logs among different OST<->MDS connections, so that
* if an OST or MDS fails it need only look at log(s) relevant to itself
+ *
+ * Author: Andreas Dilger <adilger@clusterfs.com>
+ * Author: Alex Zhuravlev <bzzz@whamcloud.com>
+ * Author: Mikhail Pershin <tappro@whamcloud.com>
*/
#define DEBUG_SUBSYSTEM S_LOG
-#ifndef EXPORT_SYMTAB
-#define EXPORT_SYMTAB
-#endif
-
-#ifndef __KERNEL__
-#include <liblustre.h>
-#endif
-
-#include <obd_class.h>
+#include <linux/kthread.h>
+#include <llog_swab.h>
#include <lustre_log.h>
-#include <libcfs/list.h>
+#include <obd_class.h>
#include "llog_internal.h"
-
-/* Allocate a new log or catalog handle */
-struct llog_handle *llog_alloc_handle(void)
+/*
+ * Allocate a new log or catalog handle
+ * Used inside llog_open().
+ */
+static struct llog_handle *llog_alloc_handle(void)
{
- struct llog_handle *loghandle;
- ENTRY;
+ struct llog_handle *loghandle;
- OBD_ALLOC(loghandle, sizeof(*loghandle));
- if (loghandle == NULL)
- RETURN(ERR_PTR(-ENOMEM));
+ OBD_ALLOC_PTR(loghandle);
+ if (loghandle == NULL)
+ return NULL;
- init_rwsem(&loghandle->lgh_lock);
+ init_rwsem(&loghandle->lgh_lock);
+ mutex_init(&loghandle->lgh_hdr_mutex);
+ INIT_LIST_HEAD(&loghandle->u.phd.phd_entry);
+ atomic_set(&loghandle->lgh_refcount, 1);
- RETURN(loghandle);
+ return loghandle;
}
-EXPORT_SYMBOL(llog_alloc_handle);
+/*
+ * Free llog handle and header data if exists. Used in llog_close() only
+ */
+static void llog_free_handle(struct llog_handle *loghandle)
+{
+ LASSERT(loghandle != NULL);
+
+ /* failed llog_init_handle */
+ if (loghandle->lgh_hdr == NULL)
+ goto out;
+
+ if (loghandle->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN)
+ LASSERT(list_empty(&loghandle->u.phd.phd_entry));
+ else if (loghandle->lgh_hdr->llh_flags & LLOG_F_IS_CAT)
+ LASSERT(list_empty(&loghandle->u.chd.chd_head));
+ OBD_FREE_LARGE(loghandle->lgh_hdr, loghandle->lgh_hdr_size);
+out:
+ OBD_FREE_PTR(loghandle);
+}
-void llog_free_handle(struct llog_handle *loghandle)
+void llog_handle_get(struct llog_handle *loghandle)
{
- if (!loghandle)
- return;
-
- if (!loghandle->lgh_hdr)
- goto out;
- if (loghandle->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN)
- list_del_init(&loghandle->u.phd.phd_entry);
- if (loghandle->lgh_hdr->llh_flags & LLOG_F_IS_CAT)
- LASSERT(list_empty(&loghandle->u.chd.chd_head));
- OBD_FREE(loghandle->lgh_hdr, LLOG_CHUNK_SIZE);
-
- out:
- OBD_FREE(loghandle, sizeof(*loghandle));
+ atomic_inc(&loghandle->lgh_refcount);
}
-EXPORT_SYMBOL(llog_free_handle);
-/* returns negative on error; 0 if success; 1 if success & log destroyed */
-int llog_cancel_rec(struct llog_handle *loghandle, int index)
+void llog_handle_put(struct llog_handle *loghandle)
{
- struct llog_log_hdr *llh = loghandle->lgh_hdr;
- int rc = 0;
- ENTRY;
+ LASSERT(atomic_read(&loghandle->lgh_refcount) > 0);
+ if (atomic_dec_and_test(&loghandle->lgh_refcount))
+ llog_free_handle(loghandle);
+}
- CDEBUG(D_RPCTRACE, "canceling %d in log "LPX64"\n",
- index, loghandle->lgh_id.lgl_oid);
+static int llog_declare_destroy(const struct lu_env *env,
+ struct llog_handle *handle,
+ struct thandle *th)
+{
+ struct llog_operations *lop;
+ int rc;
- if (index == 0) {
- CERROR("cannot cancel index 0 (which is header)\n");
- RETURN(-EINVAL);
- }
+ ENTRY;
- if (!ext2_clear_bit(index, llh->llh_bitmap)) {
- CDEBUG(D_RPCTRACE, "catalog index %u already clear?\n", index);
- RETURN(-EINVAL);
- }
+ rc = llog_handle2ops(handle, &lop);
+ if (rc)
+ RETURN(rc);
+ if (lop->lop_declare_destroy == NULL)
+ RETURN(-EOPNOTSUPP);
- llh->llh_count--;
-
- if ((llh->llh_flags & LLOG_F_ZAP_WHEN_EMPTY) &&
- (llh->llh_count == 1) &&
- (loghandle->lgh_last_idx == (LLOG_BITMAP_BYTES * 8) - 1)) {
- rc = llog_destroy(loghandle);
- if (rc) {
- CERROR("failure destroying log after last cancel: %d\n",
- rc);
- ext2_set_bit(index, llh->llh_bitmap);
- llh->llh_count++;
- } else {
- rc = 1;
- }
- RETURN(rc);
- }
+ rc = lop->lop_declare_destroy(env, handle, th);
- rc = llog_write_rec(loghandle, &llh->llh_hdr, NULL, 0, NULL, 0);
- if (rc) {
- CERROR("failure re-writing header %d\n", rc);
- ext2_set_bit(index, llh->llh_bitmap);
- llh->llh_count++;
- }
- RETURN(rc);
+ RETURN(rc);
}
-EXPORT_SYMBOL(llog_cancel_rec);
-int llog_init_handle(struct llog_handle *handle, int flags,
- struct obd_uuid *uuid)
+int llog_trans_destroy(const struct lu_env *env, struct llog_handle *handle,
+ struct thandle *th)
{
- int rc;
- struct llog_log_hdr *llh;
- ENTRY;
- LASSERT(handle->lgh_hdr == NULL);
+ struct llog_operations *lop;
+ int rc;
+ ENTRY;
- OBD_ALLOC(llh, sizeof(*llh));
- if (llh == NULL)
- RETURN(-ENOMEM);
- handle->lgh_hdr = llh;
- /* first assign flags to use llog_client_ops */
- llh->llh_flags = flags;
- rc = llog_read_header(handle);
- if (rc == 0) {
- flags = llh->llh_flags;
- if (uuid && !obd_uuid_equals(uuid, &llh->llh_tgtuuid)) {
- CERROR("uuid mismatch: %s/%s\n", (char *)uuid->uuid,
- (char *)llh->llh_tgtuuid.uuid);
- rc = -EEXIST;
- }
- GOTO(out, rc);
- } else if (rc != LLOG_EEMPTY || !flags) {
- /* set a pesudo flag for initialization */
- flags = LLOG_F_IS_CAT;
- GOTO(out, rc);
- }
- rc = 0;
-
- handle->lgh_last_idx = 0; /* header is record with index 0 */
- llh->llh_count = 1; /* for the header record */
- llh->llh_hdr.lrh_type = LLOG_HDR_MAGIC;
- llh->llh_hdr.lrh_len = llh->llh_tail.lrt_len = LLOG_CHUNK_SIZE;
- llh->llh_hdr.lrh_index = llh->llh_tail.lrt_index = 0;
- llh->llh_timestamp = cfs_time_current_sec();
- if (uuid)
- memcpy(&llh->llh_tgtuuid, uuid, sizeof(llh->llh_tgtuuid));
- llh->llh_bitmap_offset = offsetof(typeof(*llh),llh_bitmap);
- ext2_set_bit(0, llh->llh_bitmap);
+ rc = llog_handle2ops(handle, &lop);
+ if (rc < 0)
+ RETURN(rc);
+ if (lop->lop_destroy == NULL)
+ RETURN(-EOPNOTSUPP);
-out:
- if (flags & LLOG_F_IS_CAT) {
- CFS_INIT_LIST_HEAD(&handle->u.chd.chd_head);
- llh->llh_size = sizeof(struct llog_logid_rec);
- } else if (flags & LLOG_F_IS_PLAIN) {
- CFS_INIT_LIST_HEAD(&handle->u.phd.phd_entry);
- } else {
- CERROR("Unknown flags: %#x (Expected %#x or %#x\n",
- flags, LLOG_F_IS_CAT, LLOG_F_IS_PLAIN);
- LBUG();
- }
+ LASSERT(handle->lgh_obj != NULL);
+ if (!dt_object_exists(handle->lgh_obj))
+ RETURN(0);
- if (rc) {
- OBD_FREE(llh, sizeof(*llh));
- handle->lgh_hdr = NULL;
- }
- RETURN(rc);
+ rc = lop->lop_destroy(env, handle, th);
+
+ RETURN(rc);
}
-EXPORT_SYMBOL(llog_init_handle);
-int llog_close(struct llog_handle *loghandle)
+int llog_destroy(const struct lu_env *env, struct llog_handle *handle)
{
- struct llog_operations *lop;
- int rc;
- ENTRY;
+ struct llog_operations *lop;
+ struct dt_device *dt;
+ struct thandle *th;
+ int rc;
- rc = llog_handle2ops(loghandle, &lop);
- if (rc)
- GOTO(out, rc);
- if (lop->lop_close == NULL)
- GOTO(out, -EOPNOTSUPP);
- rc = lop->lop_close(loghandle);
- out:
- llog_free_handle(loghandle);
- RETURN(rc);
+ ENTRY;
+
+ rc = llog_handle2ops(handle, &lop);
+ if (rc < 0)
+ RETURN(rc);
+ if (lop->lop_destroy == NULL)
+ RETURN(-EOPNOTSUPP);
+
+ if (handle->lgh_obj == NULL) {
+ /* if lgh_obj == NULL, then it is from client side destroy */
+ rc = lop->lop_destroy(env, handle, NULL);
+ RETURN(rc);
+ }
+
+ if (!dt_object_exists(handle->lgh_obj))
+ RETURN(0);
+
+ dt = lu2dt_dev(handle->lgh_obj->do_lu.lo_dev);
+
+ th = dt_trans_create(env, dt);
+ if (IS_ERR(th))
+ RETURN(PTR_ERR(th));
+
+ rc = llog_declare_destroy(env, handle, th);
+ if (rc != 0)
+ GOTO(out_trans, rc);
+
+ rc = dt_trans_start_local(env, dt, th);
+ if (rc < 0)
+ GOTO(out_trans, rc);
+
+ rc = lop->lop_destroy(env, handle, th);
+
+out_trans:
+ dt_trans_stop(env, dt, th);
+
+ RETURN(rc);
+}
+EXPORT_SYMBOL(llog_destroy);
+
+/* returns negative on error; 0 if success; 1 if success & log destroyed */
+int llog_cancel_rec(const struct lu_env *env, struct llog_handle *loghandle,
+ int index)
+{
+ struct llog_thread_info *lgi = llog_info(env);
+ struct dt_device *dt;
+ struct llog_log_hdr *llh = loghandle->lgh_hdr;
+ struct thandle *th;
+ int rc;
+ int rc1;
+ bool subtract_count = false;
+
+ ENTRY;
+
+ CDEBUG(D_RPCTRACE, "Canceling %d in log "DOSTID"\n", index,
+ POSTID(&loghandle->lgh_id.lgl_oi));
+
+ if (index == 0) {
+ CERROR("Can't cancel index 0 which is header\n");
+ RETURN(-EINVAL);
+ }
+
+ LASSERT(loghandle != NULL);
+ LASSERT(loghandle->lgh_ctxt != NULL);
+ LASSERT(loghandle->lgh_obj != NULL);
+
+ dt = lu2dt_dev(loghandle->lgh_obj->do_lu.lo_dev);
+
+ th = dt_trans_create(env, dt);
+ if (IS_ERR(th))
+ RETURN(PTR_ERR(th));
+
+ rc = llog_declare_write_rec(env, loghandle, &llh->llh_hdr, index, th);
+ if (rc < 0)
+ GOTO(out_trans, rc);
+
+ if ((llh->llh_flags & LLOG_F_ZAP_WHEN_EMPTY))
+ rc = llog_declare_destroy(env, loghandle, th);
+
+ th->th_wait_submit = 1;
+ rc = dt_trans_start_local(env, dt, th);
+ if (rc < 0)
+ GOTO(out_trans, rc);
+
+ down_write(&loghandle->lgh_lock);
+ /* clear bitmap */
+ mutex_lock(&loghandle->lgh_hdr_mutex);
+ if (!ext2_clear_bit(index, LLOG_HDR_BITMAP(llh))) {
+ CDEBUG(D_RPCTRACE, "Catalog index %u already clear?\n", index);
+ GOTO(out_unlock, rc);
+ }
+
+ loghandle->lgh_hdr->llh_count--;
+ subtract_count = true;
+ /* Pass this index to llog_osd_write_rec(), which will use the index
+ * to only update the necesary bitmap. */
+ lgi->lgi_cookie.lgc_index = index;
+ /* update header */
+ rc = llog_write_rec(env, loghandle, &llh->llh_hdr, &lgi->lgi_cookie,
+ LLOG_HEADER_IDX, th);
+ if (rc != 0)
+ GOTO(out_unlock, rc);
+
+ if ((llh->llh_flags & LLOG_F_ZAP_WHEN_EMPTY) &&
+ (llh->llh_count == 1) &&
+ ((loghandle->lgh_last_idx == LLOG_HDR_BITMAP_SIZE(llh) - 1) ||
+ (loghandle->u.phd.phd_cat_handle != NULL &&
+ loghandle->u.phd.phd_cat_handle->u.chd.chd_current_log !=
+ loghandle))) {
+ rc = llog_trans_destroy(env, loghandle, th);
+ if (rc < 0) {
+ /* Sigh, can not destroy the final plain llog, but
+ * the bitmap has been clearly, so the record can not
+ * be accessed anymore, let's return 0 for now, and
+ * the orphan will be handled by LFSCK. */
+ CERROR("%s: can't destroy empty llog #"DOSTID
+ "#%08x: rc = %d\n",
+ loghandle->lgh_ctxt->loc_obd->obd_name,
+ POSTID(&loghandle->lgh_id.lgl_oi),
+ loghandle->lgh_id.lgl_ogen, rc);
+ GOTO(out_unlock, rc);
+ }
+ rc = LLOG_DEL_PLAIN;
+ }
+
+out_unlock:
+ mutex_unlock(&loghandle->lgh_hdr_mutex);
+ up_write(&loghandle->lgh_lock);
+out_trans:
+ rc1 = dt_trans_stop(env, dt, th);
+ if (rc == 0)
+ rc = rc1;
+ if (rc < 0 && subtract_count) {
+ mutex_lock(&loghandle->lgh_hdr_mutex);
+ loghandle->lgh_hdr->llh_count++;
+ ext2_set_bit(index, LLOG_HDR_BITMAP(llh));
+ mutex_unlock(&loghandle->lgh_hdr_mutex);
+ }
+ RETURN(rc);
}
-EXPORT_SYMBOL(llog_close);
+
+int llog_read_header(const struct lu_env *env, struct llog_handle *handle,
+ const struct obd_uuid *uuid)
+{
+ struct llog_operations *lop;
+ int rc;
+ ENTRY;
+
+ rc = llog_handle2ops(handle, &lop);
+ if (rc)
+ RETURN(rc);
+
+ if (lop->lop_read_header == NULL)
+ RETURN(-EOPNOTSUPP);
+
+ rc = lop->lop_read_header(env, handle);
+ if (rc == LLOG_EEMPTY) {
+ struct llog_log_hdr *llh = handle->lgh_hdr;
+
+ /* lrh_len should be initialized in llog_init_handle */
+ handle->lgh_last_idx = 0; /* header is record with index 0 */
+ handle->lgh_write_offset = 0;
+ llh->llh_count = 1; /* for the header record */
+ llh->llh_hdr.lrh_type = LLOG_HDR_MAGIC;
+ LASSERT(handle->lgh_ctxt->loc_chunk_size >=
+ LLOG_MIN_CHUNK_SIZE);
+ llh->llh_hdr.lrh_len = handle->lgh_ctxt->loc_chunk_size;
+ llh->llh_hdr.lrh_index = 0;
+ llh->llh_timestamp = cfs_time_current_sec();
+ if (uuid)
+ memcpy(&llh->llh_tgtuuid, uuid,
+ sizeof(llh->llh_tgtuuid));
+ llh->llh_bitmap_offset = offsetof(typeof(*llh), llh_bitmap);
+ /* Since update llog header might also call this function,
+ * let's reset the bitmap to 0 here */
+ memset(LLOG_HDR_BITMAP(llh), 0, llh->llh_hdr.lrh_len -
+ llh->llh_bitmap_offset -
+ sizeof(llh->llh_tail));
+ ext2_set_bit(0, LLOG_HDR_BITMAP(llh));
+ LLOG_HDR_TAIL(llh)->lrt_len = llh->llh_hdr.lrh_len;
+ LLOG_HDR_TAIL(llh)->lrt_index = llh->llh_hdr.lrh_index;
+ rc = 0;
+ }
+ RETURN(rc);
+}
+EXPORT_SYMBOL(llog_read_header);
+
+int llog_init_handle(const struct lu_env *env, struct llog_handle *handle,
+ int flags, struct obd_uuid *uuid)
+{
+ struct llog_log_hdr *llh;
+ enum llog_flag fmt = flags & LLOG_F_EXT_MASK;
+ int rc;
+ int chunk_size = handle->lgh_ctxt->loc_chunk_size;
+ ENTRY;
+
+ LASSERT(handle->lgh_hdr == NULL);
+
+ LASSERT(chunk_size >= LLOG_MIN_CHUNK_SIZE);
+ OBD_ALLOC_LARGE(llh, chunk_size);
+ if (llh == NULL)
+ RETURN(-ENOMEM);
+
+ handle->lgh_hdr = llh;
+ handle->lgh_hdr_size = chunk_size;
+ /* first assign flags to use llog_client_ops */
+ llh->llh_flags = flags;
+ rc = llog_read_header(env, handle, uuid);
+ if (rc == 0) {
+ if (unlikely((llh->llh_flags & LLOG_F_IS_PLAIN &&
+ flags & LLOG_F_IS_CAT) ||
+ (llh->llh_flags & LLOG_F_IS_CAT &&
+ flags & LLOG_F_IS_PLAIN))) {
+ CERROR("%s: llog type is %s but initializing %s\n",
+ handle->lgh_ctxt->loc_obd->obd_name,
+ llh->llh_flags & LLOG_F_IS_CAT ?
+ "catalog" : "plain",
+ flags & LLOG_F_IS_CAT ? "catalog" : "plain");
+ GOTO(out, rc = -EINVAL);
+ } else if (llh->llh_flags &
+ (LLOG_F_IS_PLAIN | LLOG_F_IS_CAT)) {
+ /*
+ * it is possible to open llog without specifying llog
+ * type so it is taken from llh_flags
+ */
+ flags = llh->llh_flags;
+ } else {
+ /* for some reason the llh_flags has no type set */
+ CERROR("llog type is not specified!\n");
+ GOTO(out, rc = -EINVAL);
+ }
+ if (unlikely(uuid &&
+ !obd_uuid_equals(uuid, &llh->llh_tgtuuid))) {
+ CERROR("%s: llog uuid mismatch: %s/%s\n",
+ handle->lgh_ctxt->loc_obd->obd_name,
+ (char *)uuid->uuid,
+ (char *)llh->llh_tgtuuid.uuid);
+ GOTO(out, rc = -EEXIST);
+ }
+ }
+ if (flags & LLOG_F_IS_CAT) {
+ LASSERT(list_empty(&handle->u.chd.chd_head));
+ INIT_LIST_HEAD(&handle->u.chd.chd_head);
+ llh->llh_size = sizeof(struct llog_logid_rec);
+ llh->llh_flags |= LLOG_F_IS_FIXSIZE;
+ } else if (!(flags & LLOG_F_IS_PLAIN)) {
+ CERROR("%s: unknown flags: %#x (expected %#x or %#x)\n",
+ handle->lgh_ctxt->loc_obd->obd_name,
+ flags, LLOG_F_IS_CAT, LLOG_F_IS_PLAIN);
+ rc = -EINVAL;
+ }
+ llh->llh_flags |= fmt;
+out:
+ if (rc) {
+ OBD_FREE_LARGE(llh, chunk_size);
+ handle->lgh_hdr = NULL;
+ }
+ RETURN(rc);
+}
+EXPORT_SYMBOL(llog_init_handle);
static int llog_process_thread(void *arg)
{
- struct llog_process_info *lpi = (struct llog_process_info *)arg;
- struct llog_handle *loghandle = lpi->lpi_loghandle;
- struct llog_log_hdr *llh = loghandle->lgh_hdr;
- struct llog_process_cat_data *cd = lpi->lpi_catdata;
- char *buf;
- __u64 cur_offset = LLOG_CHUNK_SIZE;
- __u64 last_offset;
- int rc = 0, index = 1, last_index;
- int saved_index = 0, last_called_index = 0;
-
- LASSERT(llh);
-
- OBD_ALLOC(buf, LLOG_CHUNK_SIZE);
- if (!buf) {
- lpi->lpi_rc = -ENOMEM;
-#ifdef __KERNEL__
- complete(&lpi->lpi_completion);
-#endif
- return 0;
- }
+ struct llog_process_info *lpi = arg;
+ struct llog_handle *loghandle = lpi->lpi_loghandle;
+ struct llog_log_hdr *llh = loghandle->lgh_hdr;
+ struct llog_process_cat_data *cd = lpi->lpi_catdata;
+ char *buf;
+ size_t chunk_size;
+ __u64 cur_offset;
+ int rc = 0, index = 1, last_index;
+ int saved_index = 0;
+ int last_called_index = 0;
+
+ ENTRY;
+
+ if (llh == NULL)
+ RETURN(-EINVAL);
+
+ cur_offset = chunk_size = llh->llh_hdr.lrh_len;
+ /* expect chunk_size to be power of two */
+ LASSERT(is_power_of_2(chunk_size));
+
+ OBD_ALLOC_LARGE(buf, chunk_size);
+ if (buf == NULL) {
+ lpi->lpi_rc = -ENOMEM;
+ RETURN(0);
+ }
+
+ if (cd != NULL) {
+ last_called_index = cd->lpcd_first_idx;
+ index = cd->lpcd_first_idx + 1;
+ }
+ if (cd != NULL && cd->lpcd_last_idx)
+ last_index = cd->lpcd_last_idx;
+ else
+ last_index = LLOG_HDR_BITMAP_SIZE(llh) - 1;
+
+ while (rc == 0) {
+ struct llog_rec_hdr *rec;
+ off_t chunk_offset;
+ unsigned int buf_offset = 0;
+ bool partial_chunk;
+
+ /* skip records not set in bitmap */
+ while (index <= last_index &&
+ !ext2_test_bit(index, LLOG_HDR_BITMAP(llh)))
+ ++index;
+
+ /* There are no indices prior the last_index */
+ if (index > last_index)
+ break;
+
+ CDEBUG(D_OTHER, "index: %d last_index %d\n", index,
+ last_index);
+
+repeat:
+ /* get the buf with our target record; avoid old garbage */
+ memset(buf, 0, chunk_size);
+ rc = llog_next_block(lpi->lpi_env, loghandle, &saved_index,
+ index, &cur_offset, buf, chunk_size);
+ if (rc != 0)
+ GOTO(out, rc);
+
+ /* NB: after llog_next_block() call the cur_offset is the
+ * offset of the next block after read one.
+ * The absolute offset of the current chunk is calculated
+ * from cur_offset value and stored in chunk_offset variable.
+ */
+ if (cur_offset % chunk_size != 0) {
+ partial_chunk = true;
+ chunk_offset = cur_offset & ~(chunk_size - 1);
+ } else {
+ partial_chunk = false;
+ chunk_offset = cur_offset - chunk_size;
+ }
+
+ /* NB: when rec->lrh_len is accessed it is already swabbed
+ * since it is used at the "end" of the loop and the rec
+ * swabbing is done at the beginning of the loop. */
+ for (rec = (struct llog_rec_hdr *)(buf + buf_offset);
+ (char *)rec < buf + chunk_size;
+ rec = llog_rec_hdr_next(rec)) {
+
+ CDEBUG(D_OTHER, "processing rec 0x%p type %#x\n",
+ rec, rec->lrh_type);
+
+ if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
+ lustre_swab_llog_rec(rec);
+
+ CDEBUG(D_OTHER, "after swabbing, type=%#x idx=%d\n",
+ rec->lrh_type, rec->lrh_index);
+
+ /* for partial chunk the end of it is zeroed, check
+ * for index 0 to distinguish it. */
+ if (partial_chunk && rec->lrh_index == 0) {
+ /* concurrent llog_add() might add new records
+ * while llog_processing, check this is not
+ * the case and re-read the current chunk
+ * otherwise. */
+ if (index > loghandle->lgh_last_idx)
+ GOTO(out, rc = 0);
+ CDEBUG(D_OTHER, "Re-read last llog buffer for "
+ "new records, index %u, last %u\n",
+ index, loghandle->lgh_last_idx);
+ /* save offset inside buffer for the re-read */
+ buf_offset = (char *)rec - (char *)buf;
+ cur_offset = chunk_offset;
+ goto repeat;
+ }
+
+ if (rec->lrh_len == 0 || rec->lrh_len > chunk_size) {
+ CWARN("invalid length %d in llog record for "
+ "index %d/%d\n", rec->lrh_len,
+ rec->lrh_index, index);
+ GOTO(out, rc = -EINVAL);
+ }
+
+ if (rec->lrh_index < index) {
+ CDEBUG(D_OTHER, "skipping lrh_index %d\n",
+ rec->lrh_index);
+ continue;
+ }
+
+ if (rec->lrh_index != index) {
+ CERROR("%s: Invalid record: index %u but "
+ "expected %u\n",
+ loghandle->lgh_ctxt->loc_obd->obd_name,
+ rec->lrh_index, index);
+ GOTO(out, rc = -ERANGE);
+ }
+
+ CDEBUG(D_OTHER,
+ "lrh_index: %d lrh_len: %d (%d remains)\n",
+ rec->lrh_index, rec->lrh_len,
+ (int)(buf + chunk_size - (char *)rec));
+
+ loghandle->lgh_cur_idx = rec->lrh_index;
+ loghandle->lgh_cur_offset = (char *)rec - (char *)buf +
+ chunk_offset;
+
+ /* if set, process the callback on this record */
+ if (ext2_test_bit(index, LLOG_HDR_BITMAP(llh))) {
+ rc = lpi->lpi_cb(lpi->lpi_env, loghandle, rec,
+ lpi->lpi_cbdata);
+ last_called_index = index;
+ if (rc == LLOG_PROC_BREAK) {
+ GOTO(out, rc);
+ } else if (rc == LLOG_DEL_RECORD) {
+ rc = llog_cancel_rec(lpi->lpi_env,
+ loghandle,
+ rec->lrh_index);
+ }
+ if (rc)
+ GOTO(out, rc);
+ }
+ /* exit if the last index is reached */
+ if (index >= last_index)
+ GOTO(out, rc = 0);
+ ++index;
+ }
+ }
- cfs_daemonize_ctxt("llog_process_thread");
+out:
+ if (cd != NULL)
+ cd->lpcd_last_idx = last_called_index;
+
+ if (unlikely(rc == -EIO && loghandle->lgh_obj != NULL)) {
+ if (dt_object_remote(loghandle->lgh_obj)) {
+ /* If it is remote object, then -EIO might means
+ * disconnection or eviction, let's return -EAGAIN,
+ * so for update recovery log processing, it will
+ * retry until the umount or abort recovery, see
+ * lod_sub_recovery_thread() */
+ CERROR("%s retry remote llog process\n",
+ loghandle->lgh_ctxt->loc_obd->obd_name);
+ rc = -EAGAIN;
+ } else {
+ /* something bad happened to the processing of a local
+ * llog file, probably I/O error or the log got
+ * corrupted to be able to finally release the log we
+ * discard any remaining bits in the header */
+ CERROR("Local llog found corrupted\n");
+ while (index <= last_index) {
+ if (ext2_test_bit(index,
+ LLOG_HDR_BITMAP(llh)) != 0)
+ llog_cancel_rec(lpi->lpi_env, loghandle,
+ index);
+ index++;
+ }
+ rc = 0;
+ }
+ }
+
+ OBD_FREE_LARGE(buf, chunk_size);
+ lpi->lpi_rc = rc;
+ return 0;
+}
- if (cd != NULL) {
- last_called_index = cd->first_idx;
- index = cd->first_idx + 1;
- }
- if (cd != NULL && cd->last_idx)
- last_index = cd->last_idx;
- else
- last_index = LLOG_BITMAP_BYTES * 8 - 1;
-
- while (rc == 0) {
- struct llog_rec_hdr *rec;
-
- /* skip records not set in bitmap */
- while (index <= last_index &&
- !ext2_test_bit(index, llh->llh_bitmap))
- ++index;
-
- LASSERT(index <= last_index + 1);
- if (index == last_index + 1)
- break;
-
- CDEBUG(D_OTHER, "index: %d last_index %d\n",
- index, last_index);
-
- /* get the buf with our target record; avoid old garbage */
- memset(buf, 0, LLOG_CHUNK_SIZE);
- last_offset = cur_offset;
- rc = llog_next_block(loghandle, &saved_index, index,
- &cur_offset, buf, LLOG_CHUNK_SIZE);
- if (rc)
- GOTO(out, rc);
-
- /* NB: when rec->lrh_len is accessed it is already swabbed
- * since it is used at the "end" of the loop and the rec
- * swabbing is done at the beginning of the loop. */
- for (rec = (struct llog_rec_hdr *)buf;
- (char *)rec < buf + LLOG_CHUNK_SIZE;
- rec = (struct llog_rec_hdr *)((char *)rec + rec->lrh_len)){
-
- CDEBUG(D_OTHER, "processing rec 0x%p type %#x\n",
- rec, rec->lrh_type);
-
- if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
- lustre_swab_llog_rec(rec, NULL);
-
- CDEBUG(D_OTHER, "after swabbing, type=%#x idx=%d\n",
- rec->lrh_type, rec->lrh_index);
-
- if (rec->lrh_index == 0)
- GOTO(out, 0); /* no more records */
-
- if (rec->lrh_len == 0 || rec->lrh_len >LLOG_CHUNK_SIZE){
- CWARN("invalid length %d in llog record for "
- "index %d/%d\n", rec->lrh_len,
- rec->lrh_index, index);
- GOTO(out, rc = -EINVAL);
- }
+static int llog_process_thread_daemonize(void *arg)
+{
+ struct llog_process_info *lpi = arg;
+ struct lu_env env;
+ int rc;
- if (rec->lrh_index < index) {
- CDEBUG(D_OTHER, "skipping lrh_index %d\n",
- rec->lrh_index);
- continue;
- }
+ unshare_fs_struct();
- CDEBUG(D_OTHER,
- "lrh_index: %d lrh_len: %d (%d remains)\n",
- rec->lrh_index, rec->lrh_len,
- (int)(buf + LLOG_CHUNK_SIZE - (char *)rec));
-
- loghandle->lgh_cur_idx = rec->lrh_index;
- loghandle->lgh_cur_offset = (char *)rec - (char *)buf +
- last_offset;
-
- /* if set, process the callback on this record */
- if (ext2_test_bit(index, llh->llh_bitmap)) {
- rc = lpi->lpi_cb(loghandle, rec,
- lpi->lpi_cbdata);
- last_called_index = index;
- if (rc == LLOG_PROC_BREAK) {
- CDEBUG(D_HA, "recovery from log: "LPX64
- ":%x stopped\n",
- loghandle->lgh_id.lgl_oid,
- loghandle->lgh_id.lgl_ogen);
- GOTO(out, rc);
- } else if (rc == LLOG_DEL_RECORD) {
- llog_cancel_rec(loghandle,
- rec->lrh_index);
- rc = 0;
- }
- if (rc)
- GOTO(out, rc);
- } else {
- CDEBUG(D_OTHER, "Skipped index %d\n", index);
- }
+ /* client env has no keys, tags is just 0 */
+ rc = lu_env_init(&env, LCT_LOCAL | LCT_MG_THREAD);
+ if (rc)
+ goto out;
+ lpi->lpi_env = &env;
- /* next record, still in buffer? */
- ++index;
- if (index > last_index)
- GOTO(out, rc = 0);
- }
- }
+ rc = llog_process_thread(arg);
- out:
- if (cd != NULL)
- cd->last_idx = last_called_index;
- if (buf)
- OBD_FREE(buf, LLOG_CHUNK_SIZE);
- lpi->lpi_rc = rc;
-#ifdef __KERNEL__
- complete(&lpi->lpi_completion);
-#endif
- return 0;
+ lu_env_fini(&env);
+out:
+ complete(&lpi->lpi_completion);
+ return rc;
}
-int llog_process(struct llog_handle *loghandle, llog_cb_t cb,
- void *data, void *catdata)
+int llog_process_or_fork(const struct lu_env *env,
+ struct llog_handle *loghandle,
+ llog_cb_t cb, void *data, void *catdata, bool fork)
{
struct llog_process_info *lpi;
int rc;
+
ENTRY;
OBD_ALLOC_PTR(lpi);
lpi->lpi_cbdata = data;
lpi->lpi_catdata = catdata;
-#ifdef __KERNEL__
- init_completion(&lpi->lpi_completion);
- rc = cfs_kernel_thread(llog_process_thread, lpi, CLONE_VM | CLONE_FILES);
- if (rc < 0) {
- CERROR("cannot start thread: %d\n", rc);
- OBD_FREE_PTR(lpi);
- RETURN(rc);
- }
- wait_for_completion(&lpi->lpi_completion);
-#else
- llog_process_thread(lpi);
-#endif
- rc = lpi->lpi_rc;
- OBD_FREE_PTR(lpi);
- RETURN(rc);
+ if (fork) {
+ struct task_struct *task;
+
+ /* The new thread can't use parent env,
+ * init the new one in llog_process_thread_daemonize. */
+ lpi->lpi_env = NULL;
+ init_completion(&lpi->lpi_completion);
+ task = kthread_run(llog_process_thread_daemonize, lpi,
+ "llog_process_thread");
+ if (IS_ERR(task)) {
+ rc = PTR_ERR(task);
+ CERROR("%s: cannot start thread: rc = %d\n",
+ loghandle->lgh_ctxt->loc_obd->obd_name, rc);
+ GOTO(out_lpi, rc);
+ }
+ wait_for_completion(&lpi->lpi_completion);
+ } else {
+ lpi->lpi_env = env;
+ llog_process_thread(lpi);
+ }
+ rc = lpi->lpi_rc;
+
+out_lpi:
+ OBD_FREE_PTR(lpi);
+ RETURN(rc);
}
-EXPORT_SYMBOL(llog_process);
+EXPORT_SYMBOL(llog_process_or_fork);
-inline int llog_get_size(struct llog_handle *loghandle)
+int llog_process(const struct lu_env *env, struct llog_handle *loghandle,
+ llog_cb_t cb, void *data, void *catdata)
{
- if (loghandle && loghandle->lgh_hdr)
- return loghandle->lgh_hdr->llh_count;
- return 0;
+ int rc;
+ rc = llog_process_or_fork(env, loghandle, cb, data, catdata, true);
+ return rc == LLOG_DEL_PLAIN ? 0 : rc;
}
-EXPORT_SYMBOL(llog_get_size);
+EXPORT_SYMBOL(llog_process);
-int llog_reverse_process(struct llog_handle *loghandle, llog_cb_t cb,
- void *data, void *catdata)
+int llog_reverse_process(const struct lu_env *env,
+ struct llog_handle *loghandle, llog_cb_t cb,
+ void *data, void *catdata)
{
struct llog_log_hdr *llh = loghandle->lgh_hdr;
struct llog_process_cat_data *cd = catdata;
void *buf;
int rc = 0, first_index = 1, index, idx;
+ __u32 chunk_size = llh->llh_hdr.lrh_len;
ENTRY;
- OBD_ALLOC(buf, LLOG_CHUNK_SIZE);
- if (!buf)
- RETURN(-ENOMEM);
-
- if (cd != NULL)
- first_index = cd->first_idx + 1;
- if (cd != NULL && cd->last_idx)
- index = cd->last_idx;
- else
- index = LLOG_BITMAP_BYTES * 8 - 1;
-
- while (rc == 0) {
- struct llog_rec_hdr *rec;
- struct llog_rec_tail *tail;
-
- /* skip records not set in bitmap */
- while (index >= first_index &&
- !ext2_test_bit(index, llh->llh_bitmap))
- --index;
-
- LASSERT(index >= first_index - 1);
- if (index == first_index - 1)
- break;
-
- /* get the buf with our target record; avoid old garbage */
- memset(buf, 0, LLOG_CHUNK_SIZE);
- rc = llog_prev_block(loghandle, index, buf, LLOG_CHUNK_SIZE);
- if (rc)
- GOTO(out, rc);
-
- rec = buf;
- idx = le32_to_cpu(rec->lrh_index);
- if (idx < index)
- CDEBUG(D_RPCTRACE, "index %u : idx %u\n", index, idx);
+ OBD_ALLOC_LARGE(buf, chunk_size);
+ if (buf == NULL)
+ RETURN(-ENOMEM);
+
+ if (cd != NULL)
+ first_index = cd->lpcd_first_idx + 1;
+ if (cd != NULL && cd->lpcd_last_idx)
+ index = cd->lpcd_last_idx;
+ else
+ index = LLOG_HDR_BITMAP_SIZE(llh) - 1;
+
+ while (rc == 0) {
+ struct llog_rec_hdr *rec;
+ struct llog_rec_tail *tail;
+
+ /* skip records not set in bitmap */
+ while (index >= first_index &&
+ !ext2_test_bit(index, LLOG_HDR_BITMAP(llh)))
+ --index;
+
+ LASSERT(index >= first_index - 1);
+ if (index == first_index - 1)
+ break;
+
+ /* get the buf with our target record; avoid old garbage */
+ memset(buf, 0, chunk_size);
+ rc = llog_prev_block(env, loghandle, index, buf, chunk_size);
+ if (rc)
+ GOTO(out, rc);
+
+ rec = buf;
+ idx = rec->lrh_index;
+ CDEBUG(D_RPCTRACE, "index %u : idx %u\n", index, idx);
while (idx < index) {
- rec = ((void *)rec + le32_to_cpu(rec->lrh_len));
+ rec = (void *)rec + rec->lrh_len;
+ if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
+ lustre_swab_llog_rec(rec);
idx ++;
}
- tail = (void *)rec + le32_to_cpu(rec->lrh_len) - sizeof(*tail);
-
- /* process records in buffer, starting where we found one */
- while ((void *)tail > buf) {
- rec = (void *)tail - le32_to_cpu(tail->lrt_len) +
- sizeof(*tail);
-
- if (rec->lrh_index == 0)
- GOTO(out, 0); /* no more records */
-
- /* if set, process the callback on this record */
- if (ext2_test_bit(index, llh->llh_bitmap)) {
- rc = cb(loghandle, rec, data);
- if (rc == LLOG_PROC_BREAK) {
- CWARN("recovery from log: "LPX64":%x"
- " stopped\n",
- loghandle->lgh_id.lgl_oid,
- loghandle->lgh_id.lgl_ogen);
- GOTO(out, rc);
- }
+ LASSERT(idx == index);
+ tail = (void *)rec + rec->lrh_len - sizeof(*tail);
+
+ /* process records in buffer, starting where we found one */
+ while ((void *)tail > buf) {
+ if (tail->lrt_index == 0)
+ GOTO(out, rc = 0); /* no more records */
+
+ /* if set, process the callback on this record */
+ if (ext2_test_bit(index, LLOG_HDR_BITMAP(llh))) {
+ rec = (void *)tail - tail->lrt_len +
+ sizeof(*tail);
+
+ rc = cb(env, loghandle, rec, data);
+ if (rc == LLOG_PROC_BREAK) {
+ GOTO(out, rc);
+ } else if (rc == LLOG_DEL_RECORD) {
+ rc = llog_cancel_rec(env, loghandle,
+ tail->lrt_index);
+ }
if (rc)
GOTO(out, rc);
}
--index;
if (index < first_index)
GOTO(out, rc = 0);
- tail = (void *)rec - sizeof(*tail);
+ tail = (void *)tail - tail->lrt_len;
}
}
out:
- if (buf)
- OBD_FREE(buf, LLOG_CHUNK_SIZE);
+ if (buf != NULL)
+ OBD_FREE_LARGE(buf, chunk_size);
RETURN(rc);
}
EXPORT_SYMBOL(llog_reverse_process);
+
+/**
+ * new llog API
+ *
+ * API functions:
+ * llog_open - open llog, may not exist
+ * llog_exist - check if llog exists
+ * llog_close - close opened llog, pair for open, frees llog_handle
+ * llog_declare_create - declare llog creation
+ * llog_create - create new llog on disk, need transaction handle
+ * llog_declare_write_rec - declaration of llog write
+ * llog_write_rec - write llog record on disk, need transaction handle
+ * llog_declare_add - declare llog catalog record addition
+ * llog_add - add llog record in catalog, need transaction handle
+ */
+int llog_exist(struct llog_handle *loghandle)
+{
+ struct llog_operations *lop;
+ int rc;
+
+ ENTRY;
+
+ rc = llog_handle2ops(loghandle, &lop);
+ if (rc)
+ RETURN(rc);
+ if (lop->lop_exist == NULL)
+ RETURN(-EOPNOTSUPP);
+
+ rc = lop->lop_exist(loghandle);
+ RETURN(rc);
+}
+EXPORT_SYMBOL(llog_exist);
+
+int llog_declare_create(const struct lu_env *env,
+ struct llog_handle *loghandle, struct thandle *th)
+{
+ struct llog_operations *lop;
+ int raised, rc;
+
+ ENTRY;
+
+ rc = llog_handle2ops(loghandle, &lop);
+ if (rc)
+ RETURN(rc);
+ if (lop->lop_declare_create == NULL)
+ RETURN(-EOPNOTSUPP);
+
+ raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
+ if (!raised)
+ cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
+ rc = lop->lop_declare_create(env, loghandle, th);
+ if (!raised)
+ cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
+ RETURN(rc);
+}
+
+int llog_create(const struct lu_env *env, struct llog_handle *handle,
+ struct thandle *th)
+{
+ struct llog_operations *lop;
+ int raised, rc;
+
+ ENTRY;
+
+ rc = llog_handle2ops(handle, &lop);
+ if (rc)
+ RETURN(rc);
+ if (lop->lop_create == NULL)
+ RETURN(-EOPNOTSUPP);
+
+ raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
+ if (!raised)
+ cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
+ rc = lop->lop_create(env, handle, th);
+ if (!raised)
+ cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
+ RETURN(rc);
+}
+
+int llog_declare_write_rec(const struct lu_env *env,
+ struct llog_handle *handle,
+ struct llog_rec_hdr *rec, int idx,
+ struct thandle *th)
+{
+ struct llog_operations *lop;
+ int raised, rc;
+
+ ENTRY;
+
+ rc = llog_handle2ops(handle, &lop);
+ if (rc)
+ RETURN(rc);
+ LASSERT(lop);
+ if (lop->lop_declare_write_rec == NULL)
+ RETURN(-EOPNOTSUPP);
+
+ raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
+ if (!raised)
+ cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
+ rc = lop->lop_declare_write_rec(env, handle, rec, idx, th);
+ if (!raised)
+ cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
+ RETURN(rc);
+}
+
+int llog_write_rec(const struct lu_env *env, struct llog_handle *handle,
+ struct llog_rec_hdr *rec, struct llog_cookie *logcookies,
+ int idx, struct thandle *th)
+{
+ struct llog_operations *lop;
+ int raised, rc, buflen;
+
+ ENTRY;
+
+ rc = llog_handle2ops(handle, &lop);
+ if (rc)
+ RETURN(rc);
+
+ LASSERT(lop);
+ if (lop->lop_write_rec == NULL)
+ RETURN(-EOPNOTSUPP);
+
+ buflen = rec->lrh_len;
+ LASSERT(cfs_size_round(buflen) == buflen);
+
+ raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
+ if (!raised)
+ cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
+ rc = lop->lop_write_rec(env, handle, rec, logcookies, idx, th);
+ if (!raised)
+ cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
+ RETURN(rc);
+}
+
+int llog_add(const struct lu_env *env, struct llog_handle *lgh,
+ struct llog_rec_hdr *rec, struct llog_cookie *logcookies,
+ struct thandle *th)
+{
+ int raised, rc;
+
+ ENTRY;
+
+ if (lgh->lgh_logops->lop_add == NULL)
+ RETURN(-EOPNOTSUPP);
+
+ raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
+ if (!raised)
+ cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
+ rc = lgh->lgh_logops->lop_add(env, lgh, rec, logcookies, th);
+ if (!raised)
+ cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
+ RETURN(rc);
+}
+EXPORT_SYMBOL(llog_add);
+
+int llog_declare_add(const struct lu_env *env, struct llog_handle *lgh,
+ struct llog_rec_hdr *rec, struct thandle *th)
+{
+ int raised, rc;
+
+ ENTRY;
+
+ if (lgh->lgh_logops->lop_declare_add == NULL)
+ RETURN(-EOPNOTSUPP);
+
+ raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
+ if (!raised)
+ cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
+ rc = lgh->lgh_logops->lop_declare_add(env, lgh, rec, th);
+ if (!raised)
+ cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
+ RETURN(rc);
+}
+EXPORT_SYMBOL(llog_declare_add);
+
+/**
+ * Helper function to open llog or create it if doesn't exist.
+ * It hides all transaction handling from caller.
+ */
+int llog_open_create(const struct lu_env *env, struct llog_ctxt *ctxt,
+ struct llog_handle **res, struct llog_logid *logid,
+ char *name)
+{
+ struct dt_device *d;
+ struct thandle *th;
+ int rc;
+
+ ENTRY;
+
+ rc = llog_open(env, ctxt, res, logid, name, LLOG_OPEN_NEW);
+ if (rc)
+ RETURN(rc);
+
+ if (llog_exist(*res))
+ RETURN(0);
+
+ LASSERT((*res)->lgh_obj != NULL);
+
+ d = lu2dt_dev((*res)->lgh_obj->do_lu.lo_dev);
+
+ th = dt_trans_create(env, d);
+ if (IS_ERR(th))
+ GOTO(out, rc = PTR_ERR(th));
+
+ /* Create update llog object synchronously, which
+ * happens during inialization process see
+ * lod_sub_prep_llog(), to make sure the update
+ * llog object is created before corss-MDT writing
+ * updates into the llog object */
+ if (ctxt->loc_flags & LLOG_CTXT_FLAG_NORMAL_FID)
+ th->th_sync = 1;
+
+ th->th_wait_submit = 1;
+ rc = llog_declare_create(env, *res, th);
+ if (rc == 0) {
+ rc = dt_trans_start_local(env, d, th);
+ if (rc == 0)
+ rc = llog_create(env, *res, th);
+ }
+ dt_trans_stop(env, d, th);
+out:
+ if (rc)
+ llog_close(env, *res);
+ RETURN(rc);
+}
+EXPORT_SYMBOL(llog_open_create);
+
+/**
+ * Helper function to delete existent llog.
+ */
+int llog_erase(const struct lu_env *env, struct llog_ctxt *ctxt,
+ struct llog_logid *logid, char *name)
+{
+ struct llog_handle *handle;
+ int rc = 0, rc2;
+
+ ENTRY;
+
+ /* nothing to erase */
+ if (name == NULL && logid == NULL)
+ RETURN(0);
+
+ rc = llog_open(env, ctxt, &handle, logid, name, LLOG_OPEN_EXISTS);
+ if (rc < 0)
+ RETURN(rc);
+
+ rc = llog_init_handle(env, handle, LLOG_F_IS_PLAIN, NULL);
+ if (rc == 0)
+ rc = llog_destroy(env, handle);
+
+ rc2 = llog_close(env, handle);
+ if (rc == 0)
+ rc = rc2;
+ RETURN(rc);
+}
+EXPORT_SYMBOL(llog_erase);
+
+/*
+ * Helper function for write record in llog.
+ * It hides all transaction handling from caller.
+ * Valid only with local llog.
+ */
+int llog_write(const struct lu_env *env, struct llog_handle *loghandle,
+ struct llog_rec_hdr *rec, int idx)
+{
+ struct dt_device *dt;
+ struct thandle *th;
+ int rc;
+
+ ENTRY;
+
+ LASSERT(loghandle);
+ LASSERT(loghandle->lgh_ctxt);
+ LASSERT(loghandle->lgh_obj != NULL);
+
+ dt = lu2dt_dev(loghandle->lgh_obj->do_lu.lo_dev);
+
+ th = dt_trans_create(env, dt);
+ if (IS_ERR(th))
+ RETURN(PTR_ERR(th));
+
+ rc = llog_declare_write_rec(env, loghandle, rec, idx, th);
+ if (rc)
+ GOTO(out_trans, rc);
+
+ th->th_wait_submit = 1;
+ rc = dt_trans_start_local(env, dt, th);
+ if (rc)
+ GOTO(out_trans, rc);
+
+ down_write(&loghandle->lgh_lock);
+ rc = llog_write_rec(env, loghandle, rec, NULL, idx, th);
+ up_write(&loghandle->lgh_lock);
+out_trans:
+ dt_trans_stop(env, dt, th);
+ RETURN(rc);
+}
+EXPORT_SYMBOL(llog_write);
+
+int llog_open(const struct lu_env *env, struct llog_ctxt *ctxt,
+ struct llog_handle **lgh, struct llog_logid *logid,
+ char *name, enum llog_open_param open_param)
+{
+ int raised;
+ int rc;
+
+ ENTRY;
+
+ LASSERT(ctxt);
+ LASSERT(ctxt->loc_logops);
+
+ if (ctxt->loc_logops->lop_open == NULL) {
+ *lgh = NULL;
+ RETURN(-EOPNOTSUPP);
+ }
+
+ *lgh = llog_alloc_handle();
+ if (*lgh == NULL)
+ RETURN(-ENOMEM);
+ (*lgh)->lgh_ctxt = ctxt;
+ (*lgh)->lgh_logops = ctxt->loc_logops;
+
+ raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
+ if (!raised)
+ cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
+ rc = ctxt->loc_logops->lop_open(env, *lgh, logid, name, open_param);
+ if (!raised)
+ cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
+ if (rc) {
+ llog_free_handle(*lgh);
+ *lgh = NULL;
+ }
+ RETURN(rc);
+}
+EXPORT_SYMBOL(llog_open);
+
+int llog_close(const struct lu_env *env, struct llog_handle *loghandle)
+{
+ struct llog_operations *lop;
+ int rc;
+
+ ENTRY;
+
+ rc = llog_handle2ops(loghandle, &lop);
+ if (rc)
+ GOTO(out, rc);
+ if (lop->lop_close == NULL)
+ GOTO(out, rc = -EOPNOTSUPP);
+ rc = lop->lop_close(env, loghandle);
+out:
+ llog_handle_put(loghandle);
+ RETURN(rc);
+}
+EXPORT_SYMBOL(llog_close);
+
+/**
+ * Helper function to get the llog size in records. It is used by MGS
+ * mostly to check that config llog exists and contains data.
+ *
+ * \param[in] env execution environment
+ * \param[in] ctxt llog context
+ * \param[in] name llog name
+ *
+ * \retval true if there are records in llog besides a header
+ * \retval false on error or llog without records
+ */
+int llog_is_empty(const struct lu_env *env, struct llog_ctxt *ctxt,
+ char *name)
+{
+ struct llog_handle *llh;
+ int rc = 0;
+
+ rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
+ if (rc < 0) {
+ if (likely(rc == -ENOENT))
+ rc = 0;
+ GOTO(out, rc);
+ }
+
+ rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
+ if (rc)
+ GOTO(out_close, rc);
+ rc = llog_get_size(llh);
+
+out_close:
+ llog_close(env, llh);
+out:
+ /* The header is record 1, the llog is still considered as empty
+ * if there is only header */
+ return (rc <= 1);
+}
+EXPORT_SYMBOL(llog_is_empty);
+
+int llog_copy_handler(const struct lu_env *env, struct llog_handle *llh,
+ struct llog_rec_hdr *rec, void *data)
+{
+ struct llog_handle *copy_llh = data;
+
+ /* Append all records */
+ return llog_write(env, copy_llh, rec, LLOG_NEXT_IDX);
+}
+
+/* backup plain llog */
+int llog_backup(const struct lu_env *env, struct obd_device *obd,
+ struct llog_ctxt *ctxt, struct llog_ctxt *bctxt,
+ char *name, char *backup)
+{
+ struct llog_handle *llh, *bllh;
+ int rc;
+
+ ENTRY;
+
+ /* open original log */
+ rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
+ if (rc < 0) {
+ /* the -ENOENT case is also reported to the caller
+ * but silently so it should handle that if needed.
+ */
+ if (rc != -ENOENT)
+ CERROR("%s: failed to open log %s: rc = %d\n",
+ obd->obd_name, name, rc);
+ RETURN(rc);
+ }
+
+ rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
+ if (rc)
+ GOTO(out_close, rc);
+
+ /* Make sure there's no old backup log */
+ rc = llog_erase(env, bctxt, NULL, backup);
+ if (rc < 0 && rc != -ENOENT)
+ GOTO(out_close, rc);
+
+ /* open backup log */
+ rc = llog_open_create(env, bctxt, &bllh, NULL, backup);
+ if (rc) {
+ CERROR("%s: failed to open backup logfile %s: rc = %d\n",
+ obd->obd_name, backup, rc);
+ GOTO(out_close, rc);
+ }
+
+ /* check that backup llog is not the same object as original one */
+ if (llh->lgh_obj == bllh->lgh_obj) {
+ CERROR("%s: backup llog %s to itself (%s), objects %p/%p\n",
+ obd->obd_name, name, backup, llh->lgh_obj,
+ bllh->lgh_obj);
+ GOTO(out_backup, rc = -EEXIST);
+ }
+
+ rc = llog_init_handle(env, bllh, LLOG_F_IS_PLAIN, NULL);
+ if (rc)
+ GOTO(out_backup, rc);
+
+ /* Copy log record by record */
+ rc = llog_process_or_fork(env, llh, llog_copy_handler, (void *)bllh,
+ NULL, false);
+ if (rc)
+ CERROR("%s: failed to backup log %s: rc = %d\n",
+ obd->obd_name, name, rc);
+out_backup:
+ llog_close(env, bllh);
+out_close:
+ llog_close(env, llh);
+ RETURN(rc);
+}
+EXPORT_SYMBOL(llog_backup);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff