X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Fobdclass%2Fllog.c;h=dbc1961d7e9eaa8e167bc5e9d8dcf9a8ea9c62be;hp=82ceab472e7b9fcfe677d3c704bee326827891ad;hb=b0f08a4e902411a8fbdb660e5b32c5821ca7159f;hpb=342797139fe89f9efd184227cfbd7d654533685c diff --git a/lustre/obdclass/llog.c b/lustre/obdclass/llog.c index 82ceab4..dbc1961 100644 --- a/lustre/obdclass/llog.c +++ b/lustre/obdclass/llog.c @@ -1,207 +1,494 @@ -/* -*- 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 Lustre, http://www.lustre.org. + * 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. * - * Lustre is free software; you can redistribute it and/or - * modify it under the terms of version 2 of the GNU General Public - * License as published by the Free Software Foundation. + * This 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). * - * Lustre is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf * - * You should have received a copy of the GNU General Public License - * along with Lustre; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * 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, 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 - -#ifdef __KERNEL__ -#include -#else +#ifndef __KERNEL__ #include #endif -#include -#include -#include +#include +#include +#include "llog_internal.h" -/* Allocate a new log or catalog handle */ +/* + * Allocate a new log or catalog handle + * Used inside llog_open(). + */ 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 ERR_PTR(-ENOMEM); - init_rwsem(&loghandle->lgh_lock); + init_rwsem(&loghandle->lgh_lock); + spin_lock_init(&loghandle->lgh_hdr_lock); + CFS_INIT_LIST_HEAD(&loghandle->u.phd.phd_entry); - RETURN(loghandle); + return loghandle; } -EXPORT_SYMBOL(llog_alloc_handle); - +/* + * Free llog handle and header data if exists. Used in llog_close() only + */ void llog_free_handle(struct llog_handle *loghandle) { - if (!loghandle) - return; - - if (!loghandle->lgh_hdr) - goto out; - if (le32_to_cpu(loghandle->lgh_hdr->llh_flags) & LLOG_F_IS_PLAIN) - list_del_init(&loghandle->u.phd.phd_entry); - if (le32_to_cpu(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)); + if (!loghandle) + return; + + if (!loghandle->lgh_hdr) + goto out; + if (loghandle->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN) + cfs_list_del_init(&loghandle->u.phd.phd_entry); + if (loghandle->lgh_hdr->llh_flags & LLOG_F_IS_CAT) + LASSERT(cfs_list_empty(&loghandle->u.chd.chd_head)); + LASSERT(sizeof(*(loghandle->lgh_hdr)) == LLOG_CHUNK_SIZE); + OBD_FREE(loghandle->lgh_hdr, LLOG_CHUNK_SIZE); + +out: + OBD_FREE_PTR(loghandle); } -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) +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; - CDEBUG(D_HA, "canceling %d in log "LPX64"\n", + CDEBUG(D_RPCTRACE, "Canceling %d in log "LPX64"\n", index, loghandle->lgh_id.lgl_oid); if (index == 0) { - CERROR("cannot cancel index 0 (which is header)\n"); + CERROR("Can't cancel index 0 which is header\n"); RETURN(-EINVAL); } - if (!ext2_clear_bit(index, llh->llh_bitmap)) { - CERROR("catalog index %u already clear?\n", index); - RETURN(-EINVAL); + spin_lock(&loghandle->lgh_hdr_lock); + if (!ext2_clear_bit(index, llh->llh_bitmap)) { + spin_unlock(&loghandle->lgh_hdr_lock); + CDEBUG(D_RPCTRACE, "Catalog index %u already clear?\n", index); + RETURN(-ENOENT); + } + + 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)) { + spin_unlock(&loghandle->lgh_hdr_lock); + rc = llog_destroy(env, loghandle); + if (rc < 0) { + CERROR("%s: can't destroy empty llog #"LPX64"#"LPX64 + "#%08x: rc = %d\n", + loghandle->lgh_ctxt->loc_obd->obd_name, + loghandle->lgh_id.lgl_oid, + loghandle->lgh_id.lgl_oseq, + loghandle->lgh_id.lgl_ogen, rc); + GOTO(out_err, rc); + } + RETURN(1); + } + spin_unlock(&loghandle->lgh_hdr_lock); + + rc = llog_write(env, loghandle, &llh->llh_hdr, NULL, 0, NULL, 0); + if (rc < 0) { + CERROR("%s: fail to write header for llog #"LPX64"#"LPX64 + "#%08x: rc = %d\n", + loghandle->lgh_ctxt->loc_obd->obd_name, + loghandle->lgh_id.lgl_oid, + loghandle->lgh_id.lgl_oseq, + loghandle->lgh_id.lgl_ogen, rc); + GOTO(out_err, rc); + } + RETURN(0); +out_err: + spin_lock(&loghandle->lgh_hdr_lock); + ext2_set_bit(index, llh->llh_bitmap); + llh->llh_count++; + spin_unlock(&loghandle->lgh_hdr_lock); + return rc; +} +EXPORT_SYMBOL(llog_cancel_rec); + +static int llog_read_header(const struct lu_env *env, + struct llog_handle *handle, + struct obd_uuid *uuid) +{ + struct llog_operations *lop; + int rc; + + 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; + + 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 = 0; + } + return rc; +} + +int llog_init_handle(const struct lu_env *env, struct llog_handle *handle, + int flags, struct obd_uuid *uuid) +{ + struct llog_log_hdr *llh; + int rc; + + ENTRY; + LASSERT(handle->lgh_hdr == NULL); + + OBD_ALLOC_PTR(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(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(cfs_list_empty(&handle->u.chd.chd_head)); + CFS_INIT_LIST_HEAD(&handle->u.chd.chd_head); + llh->llh_size = sizeof(struct llog_logid_rec); + } 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; + } +out: + if (rc) { + OBD_FREE_PTR(llh); + handle->lgh_hdr = NULL; + } + RETURN(rc); +} +EXPORT_SYMBOL(llog_init_handle); + +static int llog_process_thread(void *arg) +{ + 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; + __u64 cur_offset = LLOG_CHUNK_SIZE; + __u64 last_offset; + int rc = 0, index = 1, last_index; + int saved_index = 0; + int last_called_index = 0; + + ENTRY; + + LASSERT(llh); + + OBD_ALLOC(buf, LLOG_CHUNK_SIZE); + if (!buf) { + lpi->lpi_rc = -ENOMEM; + RETURN(0); } - llh->llh_count = cpu_to_le32(le32_to_cpu(llh->llh_count) - 1); + 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_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; - if ((le32_to_cpu(llh->llh_flags) & LLOG_F_ZAP_WHEN_EMPTY) && - (le32_to_cpu(llh->llh_count) == 1) && - (loghandle->lgh_last_idx == (LLOG_BITMAP_BYTES * 8) - 1)) { - rc = llog_destroy(loghandle); + LASSERT(index <= last_index + 1); + if (index == last_index + 1) + break; +repeat: + 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(lpi->lpi_env, loghandle, &saved_index, + index, &cur_offset, buf, LLOG_CHUNK_SIZE); if (rc) - CERROR("failure destroying log after last cancel: %d\n", - rc); - LASSERT(rc == 0); - RETURN(1); + 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); + + CDEBUG(D_OTHER, "after swabbing, type=%#x idx=%d\n", + rec->lrh_type, rec->lrh_index); + + if (rec->lrh_index == 0) { + /* probably another rec just got added? */ + if (index <= loghandle->lgh_last_idx) + GOTO(repeat, rc = 0); + GOTO(out, rc = 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); + } + + if (rec->lrh_index < index) { + CDEBUG(D_OTHER, "skipping lrh_index %d\n", + rec->lrh_index); + continue; + } + + 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(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) { + llog_cancel_rec(lpi->lpi_env, + loghandle, + rec->lrh_index); + rc = 0; + } + if (rc) + GOTO(out, rc); + } else { + CDEBUG(D_OTHER, "Skipped index %d\n", index); + } + + /* next record, still in buffer? */ + ++index; + if (index > last_index) + GOTO(out, rc = 0); + } } - rc = llog_write_rec(loghandle, &llh->llh_hdr, NULL, 0, NULL, 0); - if (rc) - CERROR("failure re-writing header %d\n", rc); - LASSERT(rc == 0); - RETURN(rc); +out: + if (cd != NULL) + cd->lpcd_last_idx = last_called_index; + + OBD_FREE(buf, LLOG_CHUNK_SIZE); + lpi->lpi_rc = rc; + return 0; } -EXPORT_SYMBOL(llog_cancel_rec); -int llog_init_handle(struct llog_handle *handle, int flags, - struct obd_uuid *uuid) +#ifdef __KERNEL__ +static int llog_process_thread_daemonize(void *arg) { - int rc; - struct llog_log_hdr *llh; - ENTRY; - LASSERT(handle->lgh_hdr == NULL); + struct llog_process_info *lpi = arg; + struct lu_env env; + int rc; - 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 = cpu_to_le32(flags); - rc = llog_read_header(handle); - if (rc == 0) { - flags = le32_to_cpu(llh->llh_flags); - if (uuid) - LASSERT(obd_uuid_equals(uuid, &llh->llh_tgtuuid)); - 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 = cpu_to_le32(1); /* for the header record */ - llh->llh_hdr.lrh_type = cpu_to_le32(LLOG_HDR_MAGIC); - llh->llh_hdr.lrh_len = llh->llh_tail.lrt_len = - cpu_to_le32(LLOG_CHUNK_SIZE); - llh->llh_hdr.lrh_index = llh->llh_tail.lrt_index = 0; - llh->llh_timestamp = cpu_to_le64(LTIME_S(CURRENT_TIME)); - if (uuid) - memcpy(&llh->llh_tgtuuid, uuid, sizeof(llh->llh_tgtuuid)); - llh->llh_bitmap_offset = cpu_to_le32(offsetof(typeof(*llh),llh_bitmap)); - ext2_set_bit(0, llh->llh_bitmap); + cfs_daemonize_ctxt("llog_process_thread"); + + /* client env has no keys, tags is just 0 */ + rc = lu_env_init(&env, LCT_LOCAL); + if (rc) + goto out; + lpi->lpi_env = &env; + rc = llog_process_thread(arg); + + lu_env_fini(&env); out: - if (flags & LLOG_F_IS_CAT) { - INIT_LIST_HEAD(&handle->u.chd.chd_head); - llh->llh_size = cpu_to_le32(sizeof(struct llog_logid_rec)); - } - else if (flags & LLOG_F_IS_PLAIN) - INIT_LIST_HEAD(&handle->u.phd.phd_entry); - else - LBUG(); + complete(&lpi->lpi_completion); + return rc; +} +#endif + +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; - if (rc) { - OBD_FREE(llh, sizeof(*llh)); - handle->lgh_hdr = NULL; + 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; + +#ifdef __KERNEL__ + if (fork) { + /* 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); + rc = cfs_create_thread(llog_process_thread_daemonize, lpi, + CFS_DAEMON_FLAGS); + if (rc < 0) { + CERROR("%s: cannot start thread: rc = %d\n", + loghandle->lgh_ctxt->loc_obd->obd_name, rc); + OBD_FREE_PTR(lpi); + RETURN(rc); + } + wait_for_completion(&lpi->lpi_completion); + } else { + lpi->lpi_env = env; + llog_process_thread(lpi); + } +#else + lpi->lpi_env = env; + llog_process_thread(lpi); +#endif + rc = lpi->lpi_rc; + OBD_FREE_PTR(lpi); RETURN(rc); } -EXPORT_SYMBOL(llog_init_handle); +EXPORT_SYMBOL(llog_process_or_fork); -int llog_close(struct llog_handle *loghandle) +int llog_process(const struct lu_env *env, struct llog_handle *loghandle, + llog_cb_t cb, void *data, void *catdata) { - struct llog_operations *lop; - int rc; - ENTRY; + return llog_process_or_fork(env, loghandle, cb, data, catdata, true); +} +EXPORT_SYMBOL(llog_process); - 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); +inline int llog_get_size(struct llog_handle *loghandle) +{ + if (loghandle && loghandle->lgh_hdr) + return loghandle->lgh_hdr->llh_count; + return 0; } -EXPORT_SYMBOL(llog_close); +EXPORT_SYMBOL(llog_get_size); -int llog_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; - __u64 cur_offset = LLOG_CHUNK_SIZE; - int rc = 0, index = 1, last_index, idx; - int saved_index = 0; + int rc = 0, first_index = 1, index, idx; ENTRY; OBD_ALLOC(buf, LLOG_CHUNK_SIZE); @@ -209,71 +496,444 @@ int llog_process(struct llog_handle *loghandle, llog_cb_t cb, RETURN(-ENOMEM); if (cd != NULL) - index = cd->first_idx + 1; - if (cd != NULL && cd->last_idx) - last_index = cd->last_idx; + first_index = cd->lpcd_first_idx + 1; + if (cd != NULL && cd->lpcd_last_idx) + index = cd->lpcd_last_idx; else - last_index = LLOG_BITMAP_BYTES * 8 - 1; - + 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 <= last_index && + while (index >= first_index && !ext2_test_bit(index, llh->llh_bitmap)) - ++index; + --index; - LASSERT(index <= last_index + 1); - if (index == last_index + 1) + 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_next_block(loghandle, &saved_index, index, - &cur_offset, buf, LLOG_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); + rc = llog_prev_block(env, loghandle, index, buf, + LLOG_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 ++; } + LASSERT(idx == index); + tail = (void *)rec + rec->lrh_len - sizeof(*tail); /* process records in buffer, starting where we found one */ - while ((void *)rec < buf + LLOG_CHUNK_SIZE) { - if (rec->lrh_index == 0) - GOTO(out, 0); /* no more records */ + 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, 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); - } + 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) { + llog_cancel_rec(env, loghandle, + tail->lrt_index); + rc = 0; + } if (rc) GOTO(out, rc); } - /* next record, still in buffer? */ - ++index; - if (index > last_index) + /* previous record, still in buffer? */ + --index; + if (index < first_index) GOTO(out, rc = 0); - rec = ((void *)rec + le32_to_cpu(rec->lrh_len)); + tail = (void *)tail - tail->lrt_len; } } - out: +out: if (buf) OBD_FREE(buf, LLOG_CHUNK_SIZE); RETURN(rc); } -EXPORT_SYMBOL(llog_process); +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); +} +EXPORT_SYMBOL(llog_declare_create); + +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); +} +EXPORT_SYMBOL(llog_create); + +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); +} +EXPORT_SYMBOL(llog_declare_write_rec); + +int llog_write_rec(const struct lu_env *env, struct llog_handle *handle, + struct llog_rec_hdr *rec, struct llog_cookie *logcookies, + int numcookies, void *buf, 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); + + if (buf) + buflen = rec->lrh_len + sizeof(struct llog_rec_hdr) + + sizeof(struct llog_rec_tail); + else + 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, numcookies, + buf, idx, th); + if (!raised) + cfs_cap_lower(CFS_CAP_SYS_RESOURCE); + RETURN(rc); +} +EXPORT_SYMBOL(llog_write_rec); + +int llog_add(const struct lu_env *env, struct llog_handle *lgh, + struct llog_rec_hdr *rec, struct llog_cookie *logcookies, + void *buf, 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, buf, 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 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); + + if ((*res)->lgh_obj != NULL) { + struct dt_device *d; + + 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)); + + 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); + } else { + /* lvfs compat code */ + LASSERT((*res)->lgh_file == NULL); + rc = llog_create(env, *res, NULL); + } +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, struct llog_cookie *reccookie, + int cookiecount, void *buf, int idx) +{ + int rc; + + ENTRY; + + LASSERT(loghandle); + LASSERT(loghandle->lgh_ctxt); + + if (loghandle->lgh_obj != NULL) { + struct dt_device *dt; + struct thandle *th; + + 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); + + 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, reccookie, + cookiecount, buf, idx, th); + up_write(&loghandle->lgh_lock); +out_trans: + dt_trans_stop(env, dt, th); + } else { /* lvfs compatibility */ + down_write(&loghandle->lgh_lock); + rc = llog_write_rec(env, loghandle, rec, reccookie, + cookiecount, buf, idx, NULL); + up_write(&loghandle->lgh_lock); + } + 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, -EOPNOTSUPP); + rc = lop->lop_close(env, loghandle); +out: + llog_free_handle(loghandle); + RETURN(rc); +} +EXPORT_SYMBOL(llog_close);