X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Fobdclass%2Fllog.c;h=f2f2fc6ae654917a5551ffb20b5582f7989c9601;hp=217b3f86a2f376ff553bda747cf9c7397b9c6b8f;hb=4724b52bba54ccdb0f81d0c63010b69e87e7f65c;hpb=113303973ec9f8484eb2355a1a6ef3c4c7fd6a56;ds=sidebyside diff --git a/lustre/obdclass/llog.c b/lustre/obdclass/llog.c index 217b3f8..f2f2fc6 100644 --- a/lustre/obdclass/llog.c +++ b/lustre/obdclass/llog.c @@ -1,409 +1,778 @@ -/* -*- 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 + * 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.gnu.org/licenses/gpl-2.0.html * - * 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. + * GPL HEADER END + */ +/* + * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. * - * OST<->MDS recovery logging infrastructure. + * 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 + * Author: Alex Zhuravlev + * Author: Mikhail Pershin */ #define DEBUG_SUBSYSTEM S_LOG -#ifndef EXPORT_SYMTAB -#define EXPORT_SYMTAB -#endif +#include +#include +#include +#include +#include "llog_internal.h" +/* + * Allocate a new log or catalog handle + * Used inside llog_open(). + */ +static struct llog_handle *llog_alloc_handle(void) +{ + struct llog_handle *loghandle; -#ifndef __KERNEL__ -#include -#endif + OBD_ALLOC_PTR(loghandle); + if (loghandle == NULL) + return NULL; -#include -#include -#include + 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; +} -/* Allocate a new log or catalog handle */ -struct llog_handle *llog_alloc_handle(void) +/* + * Free llog handle and header data if exists. Used in llog_close() only + */ +static void llog_free_handle(struct llog_handle *loghandle) { - struct llog_handle *loghandle; - ENTRY; + LASSERT(loghandle != NULL); - OBD_ALLOC(loghandle, sizeof(*loghandle)); - if (loghandle == NULL) - RETURN(ERR_PTR(-ENOMEM)); + /* failed llog_init_handle */ + if (loghandle->lgh_hdr == NULL) + goto out; - init_rwsem(&loghandle->lgh_lock); + 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_handle_get(struct llog_handle *loghandle) +{ + atomic_inc(&loghandle->lgh_refcount); +} + +void llog_handle_put(struct llog_handle *loghandle) +{ + LASSERT(atomic_read(&loghandle->lgh_refcount) > 0); + if (atomic_dec_and_test(&loghandle->lgh_refcount)) + llog_free_handle(loghandle); +} + +static int llog_declare_destroy(const struct lu_env *env, + struct llog_handle *handle, + struct thandle *th) +{ + struct llog_operations *lop; + int rc; + + ENTRY; + + rc = llog_handle2ops(handle, &lop); + if (rc) + RETURN(rc); + if (lop->lop_declare_destroy == NULL) + RETURN(-EOPNOTSUPP); + + rc = lop->lop_declare_destroy(env, handle, th); - RETURN(loghandle); + RETURN(rc); } -EXPORT_SYMBOL(llog_alloc_handle); +int llog_trans_destroy(const struct lu_env *env, struct llog_handle *handle, + struct thandle *th) +{ + struct llog_operations *lop; + int rc; + ENTRY; + + rc = llog_handle2ops(handle, &lop); + if (rc < 0) + RETURN(rc); + if (lop->lop_destroy == NULL) + RETURN(-EOPNOTSUPP); + + LASSERT(handle->lgh_obj != NULL); + if (!dt_object_exists(handle->lgh_obj)) + RETURN(0); + + rc = lop->lop_destroy(env, handle, th); -void llog_free_handle(struct llog_handle *loghandle) + RETURN(rc); +} + +int llog_destroy(const struct lu_env *env, struct llog_handle *handle) { - 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)); + struct llog_operations *lop; + struct dt_device *dt; + struct thandle *th; + int 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_free_handle); +EXPORT_SYMBOL(llog_destroy); /* returns negative on error; 0 if success; 1 if success & log destroyed */ -int llog_cancel_rec(struct llog_handle *loghandle, int index) +int llog_cancel_rec(const struct lu_env *env, struct llog_handle *loghandle, + int index) { - struct llog_log_hdr *llh = loghandle->lgh_hdr; - int rc = 0; - ENTRY; + 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; - CDEBUG(D_HA, "canceling %d in log "LPX64"\n", - index, loghandle->lgh_id.lgl_oid); + ENTRY; - if (index == 0) { - CERROR("cannot cancel index 0 (which is header)\n"); - RETURN(-EINVAL); - } + CDEBUG(D_RPCTRACE, "Canceling %d in log "DOSTID"\n", index, + POSTID(&loghandle->lgh_id.lgl_oi)); - if (!ext2_clear_bit(index, llh->llh_bitmap)) { - CDEBUG(D_HA, "catalog index %u already clear?\n", index); - RETURN(-EINVAL); - } + if (index == 0) { + CERROR("Can't cancel index 0 which is header\n"); + RETURN(-EINVAL); + } - 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); - } + LASSERT(loghandle != NULL); + LASSERT(loghandle->lgh_ctxt != NULL); + LASSERT(loghandle->lgh_obj != NULL); - 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); + 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); + if (rc < 0) + GOTO(out_trans, rc); + } + + 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))) { + /* never try to destroy it again */ + llh->llh_flags &= ~LLOG_F_ZAP_WHEN_EMPTY; + 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_cancel_rec); -int llog_init_handle(struct llog_handle *handle, int flags, - struct obd_uuid *uuid) +int llog_read_header(const struct lu_env *env, struct llog_handle *handle, + const struct obd_uuid *uuid) { - 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 = CURRENT_SECONDS; - 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) + RETURN(rc); -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(); - } + if (lop->lop_read_header == NULL) + RETURN(-EOPNOTSUPP); - if (rc) { - OBD_FREE(llh, sizeof(*llh)); - handle->lgh_hdr = NULL; - } - RETURN(rc); + 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); -int llog_close(struct llog_handle *loghandle) +static int llog_process_thread(void *arg) { - struct llog_operations *lop; - int rc; - ENTRY; + 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, tmp_offset; + int rc = 0, index = 1, last_index; + int saved_index = 0; + int last_called_index = 0; - 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; + + 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. + */ + tmp_offset = cur_offset; + if (do_div(tmp_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. */ + int records; + if (index > loghandle->lgh_last_idx) + GOTO(out, rc = 0); + /* <2 records means no more records + * if the last record we processed was + * the final one, then the underlying + * object might have been destroyed yet. + * we better don't access that.. */ + mutex_lock(&loghandle->lgh_hdr_mutex); + records = loghandle->lgh_hdr->llh_count; + mutex_unlock(&loghandle->lgh_hdr_mutex); + if (records <= 1) + 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; + } + } + +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; } -EXPORT_SYMBOL(llog_close); -int llog_process(struct llog_handle *loghandle, llog_cb_t cb, - void *data, void *catdata) +static int llog_process_thread_daemonize(void *arg) { - struct llog_log_hdr *llh = loghandle->lgh_hdr; - struct llog_process_cat_data *cd = catdata; - char *buf; - __u64 cur_offset = LLOG_CHUNK_SIZE, last_offset; - int rc = 0, index = 1, last_index; - int saved_index = 0, last_called_index = 0; - ENTRY; + struct llog_process_info *lpi = arg; + struct lu_env env; + int rc; - LASSERT(llh); + unshare_fs_struct(); - OBD_ALLOC(buf, LLOG_CHUNK_SIZE); - if (!buf) - RETURN(-ENOMEM); + /* 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; - 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 */ - 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); - } + rc = llog_process_thread(arg); - if (rec->lrh_index < index) { - CDEBUG(D_OTHER, "skipping lrh_index %d\n", - rec->lrh_index); - continue; - } + lu_env_fini(&env); +out: + complete(&lpi->lpi_completion); + return rc; +} - 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 = cb(loghandle, rec, data); - 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); - } +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; - /* next record, still in buffer? */ - ++index; - if (index > last_index) - GOTO(out, rc = 0); - } + ENTRY; + + OBD_ALLOC_PTR(lpi); + if (lpi == NULL) { + CERROR("cannot alloc pointer\n"); + RETURN(-ENOMEM); } + lpi->lpi_loghandle = loghandle; + lpi->lpi_cb = cb; + lpi->lpi_cbdata = data; + lpi->lpi_catdata = catdata; - out: - if (cd != NULL) - cd->last_idx = last_called_index; - if (buf) - OBD_FREE(buf, LLOG_CHUNK_SIZE); - 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); + OBD_ALLOC_LARGE(buf, chunk_size); + if (buf == NULL) + 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; + 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; + 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; + /* 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; + 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); + /* 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 = le32_to_cpu(rec->lrh_index); - if (idx < index) - CDEBUG(D_HA, "index %u : idx %u\n", index, idx); + 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); } @@ -412,13 +781,515 @@ int llog_reverse_process(struct llog_handle *loghandle, llog_cb_t cb, --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; + + /* API sanity checks */ + if (handle == NULL) { + CERROR("loghandle is missed\n"); + RETURN(-EPROTO); + } else if (handle->lgh_obj == NULL) { + CERROR("loghandle %p with NULL object\n", + handle); + RETURN(-EPROTO); + } else if (th == NULL) { + CERROR("%s: missed transaction handle\n", + handle->lgh_obj->do_lu.lo_dev->ld_obd->obd_name); + RETURN(-EPROTO); + } else if (handle->lgh_hdr == NULL) { + CERROR("%s: loghandle %p with no header\n", + handle->lgh_obj->do_lu.lo_dev->ld_obd->obd_name, + handle); + RETURN(-EPROTO); + } + + rc = llog_handle2ops(handle, &lop); + if (rc) + RETURN(rc); + + 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); + +/* Get size of llog */ +__u64 llog_size(const struct lu_env *env, struct llog_handle *llh) +{ + int rc; + struct lu_attr la; + + rc = llh->lgh_obj->do_ops->do_attr_get(env, llh->lgh_obj, &la); + if (rc) { + CERROR("%s: attr_get failed, rc = %d\n", + llh->lgh_ctxt->loc_obd->obd_name, rc); + return 0; + } + + return la.la_size; +} +EXPORT_SYMBOL(llog_size); +