X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Fobdclass%2Fllog.c;h=aec0202500f26b03c6584c18909f8a73243c1a5b;hp=0ad595f7d9d78064324efa1846341881452760dd;hb=aa22a6826ee521ab14994a4533b0dbffb529aab0;hpb=58bfc97a513ee6b60ac915c34b8ce368e0663881 diff --git a/lustre/obdclass/llog.c b/lustre/obdclass/llog.c index 0ad595f..1af4ae5 100644 --- a/lustre/obdclass/llog.c +++ b/lustre/obdclass/llog.c @@ -1,279 +1,1539 @@ -/* -*- 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.gnu.org/licenses/gpl-2.0.html * - * 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. + * 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, 2017, Intel Corporation. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ * + * 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 +#include +#include "llog_internal.h" -#ifdef __KERNEL__ -#include -#else -#include -#endif +/* + * Allocate a new log or catalog handle + * Used inside llog_open(). + */ +static struct llog_handle *llog_alloc_handle(void) +{ + struct llog_handle *loghandle; -#include -#include -#include + OBD_ALLOC_PTR(loghandle); + if (loghandle == NULL) + return NULL; -/* Allocate a new log or catalog handle */ -struct llog_handle *llog_alloc_handle(void) + init_rwsem(&loghandle->lgh_lock); + mutex_init(&loghandle->lgh_hdr_mutex); + init_rwsem(&loghandle->lgh_last_sem); + INIT_LIST_HEAD(&loghandle->u.phd.phd_entry); + refcount_set(&loghandle->lgh_refcount, 1); + + return loghandle; +} + +/* + * 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); + + /* 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); +} + +struct llog_handle *llog_handle_get(struct llog_handle *loghandle) +{ + if (refcount_inc_not_zero(&loghandle->lgh_refcount)) + return loghandle; + return NULL; +} - OBD_ALLOC(loghandle, sizeof(*loghandle)); - if (loghandle == NULL) - RETURN(ERR_PTR(-ENOMEM)); +int llog_handle_put(const struct lu_env *env, struct llog_handle *loghandle) +{ + int rc = 0; - init_rwsem(&loghandle->lgh_lock); + if (refcount_dec_and_test(&loghandle->lgh_refcount)) { + const struct llog_operations *lop; - RETURN(loghandle); + rc = llog_handle2ops(loghandle, &lop); + if (!rc) { + if (lop->lop_close) + rc = lop->lop_close(env, loghandle); + else + rc = -EOPNOTSUPP; + } + llog_free_handle(loghandle); + } + return rc; } -EXPORT_SYMBOL(llog_alloc_handle); +static int llog_declare_destroy(const struct lu_env *env, + struct llog_handle *handle, + struct thandle *th) +{ + const struct llog_operations *lop; + int rc; + + ENTRY; + + rc = llog_handle2ops(handle, &lop); + if (rc) + RETURN(rc); + if (lop->lop_declare_destroy == NULL) + RETURN(-EOPNOTSUPP); -void llog_free_handle(struct llog_handle *loghandle) + rc = lop->lop_declare_destroy(env, handle, th); + + RETURN(rc); +} + +int llog_trans_destroy(const struct lu_env *env, struct llog_handle *handle, + struct thandle *th) { - if (!loghandle) - return; + const 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 (!llog_exist(handle)) + RETURN(0); - 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); + rc = lop->lop_destroy(env, handle, th); - out: - OBD_FREE(loghandle, sizeof(*loghandle)); + RETURN(rc); } -EXPORT_SYMBOL(llog_free_handle); + +int llog_destroy(const struct lu_env *env, struct llog_handle *handle) +{ + const 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 (!llog_exist(handle)) + RETURN(0); + + dt = lu2dt_dev(handle->lgh_obj->do_lu.lo_dev); + + if (unlikely(unlikely(dt->dd_rdonly))) + RETURN(-EROFS); + + 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(struct llog_handle *loghandle, int index) +int llog_cancel_arr_rec(const struct lu_env *env, struct llog_handle *loghandle, + int num, 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; + struct thandle *th; + __u32 tmp_lgc_index; + int rc, i = 0; + 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); - } + LASSERT(loghandle != NULL); + LASSERT(loghandle->lgh_ctxt != NULL); + LASSERT(loghandle->lgh_obj != NULL); - if (!ext2_clear_bit(index, llh->llh_bitmap)) { - CERROR("catalog index %u already clear?\n", index); - RETURN(-EINVAL); - } + llh = loghandle->lgh_hdr; - 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); - LASSERT(rc == 0); - RETURN(1); - } + CDEBUG(D_RPCTRACE, "Canceling %d records, first %d in log "DFID"\n", + num, index[0], PFID(&loghandle->lgh_id.lgl_oi.oi_fid)); - 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); + dt = lu2dt_dev(loghandle->lgh_obj->do_lu.lo_dev); + + if (unlikely(unlikely(dt->dd_rdonly))) + RETURN(0); + + th = dt_trans_create(env, dt); + if (IS_ERR(th)) + RETURN(PTR_ERR(th)); + + rc = llog_declare_write_rec(env, loghandle, &llh->llh_hdr, 0, 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); + for (i = 0; i < num; ++i) { + if (index[i] == 0) { + CERROR("Can't cancel index 0 which is header\n"); + GOTO(out_unlock, rc = -EINVAL); + } + if (!__test_and_clear_bit_le(index[i], LLOG_HDR_BITMAP(llh))) { + CDEBUG(D_RPCTRACE, "Catalog index %u already clear?\n", + index[i]); + GOTO(out_unlock, rc = -ENOENT); + } + } + loghandle->lgh_hdr->llh_count -= num; + subtract_count = true; + + /* Since llog_process_thread use lgi_cookie, it`s better to save them + * and restore after using + */ + tmp_lgc_index = lgi->lgi_cookie.lgc_index; + /* 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[0]; + /* update header */ + rc = llog_write_rec(env, loghandle, &llh->llh_hdr, (num != 1 ? NULL : + &lgi->lgi_cookie), LLOG_HEADER_IDX, th); + lgi->lgi_cookie.lgc_index = tmp_lgc_index; + + 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 "DFID": rc = %d\n", + loghandle2name(loghandle), + PFID(&loghandle->lgh_id.lgl_oi.oi_fid), rc); + GOTO(out_unlock, rc = 0); + } + rc = LLOG_DEL_PLAIN; + } + +out_unlock: + if (rc < 0) { + /* restore bitmap while holding a mutex */ + if (subtract_count) { + loghandle->lgh_hdr->llh_count += num; + subtract_count = false; + } + for (i = i - 1; i >= 0; i--) + set_bit_le(index[i], LLOG_HDR_BITMAP(llh)); + } + 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 (rc1 < 0) { + mutex_lock(&loghandle->lgh_hdr_mutex); + if (subtract_count) + loghandle->lgh_hdr->llh_count += num; + for (i = i - 1; i >= 0; i--) + set_bit_le(index[i], 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_cancel_rec(const struct lu_env *env, struct llog_handle *loghandle, + int index) { - int rc; - struct llog_log_hdr *llh; - ENTRY; - LASSERT(handle->lgh_hdr == NULL); - - 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) - 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 = 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 = LTIME_S(CURRENT_TIME); - 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); + return llog_cancel_arr_rec(env, loghandle, 1, &index); +} + +int llog_read_header(const struct lu_env *env, struct llog_handle *handle, + const struct obd_uuid *uuid) +{ + const 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 */ + 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 = ktime_get_real_seconds(); + 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)); + set_bit_le(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", + loghandle2name(handle), + 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", + loghandle2name(handle), + (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", + loghandle2name(handle), flags, LLOG_F_IS_CAT, + LLOG_F_IS_PLAIN); + rc = -EINVAL; + } + llh->llh_flags |= fmt; out: - if (flags & LLOG_F_IS_CAT) { - INIT_LIST_HEAD(&handle->u.chd.chd_head); - llh->llh_size = sizeof(struct llog_logid_rec); - } - else if (flags & LLOG_F_IS_PLAIN) - INIT_LIST_HEAD(&handle->u.phd.phd_entry); - else - LBUG(); - - if (rc) { - OBD_FREE(llh, sizeof(*llh)); - handle->lgh_hdr = NULL; - } - RETURN(rc); + 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) +int llog_verify_record(const struct llog_handle *llh, struct llog_rec_hdr *rec) { - struct llog_operations *lop; - int rc; - ENTRY; + int chunk_size = llh->lgh_hdr->llh_hdr.lrh_len; - 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); + if (rec->lrh_len == 0 || rec->lrh_len > chunk_size) { + CERROR("%s: record is too large: %d > %d\n", + loghandle2name(llh), rec->lrh_len, chunk_size); + return -EINVAL; + } + if (rec->lrh_index >= LLOG_HDR_BITMAP_SIZE(llh->lgh_hdr)) { + CERROR("%s: index is too high: %d\n", + loghandle2name(llh), rec->lrh_index); + return -EINVAL; + } + if ((rec->lrh_type & LLOG_OP_MASK) != LLOG_OP_MAGIC) { + CERROR("%s: magic %x is bad\n", + loghandle2name(llh), rec->lrh_type); + return -EINVAL; + } + + return 0; +} +EXPORT_SYMBOL(llog_verify_record); + +static inline bool llog_is_index_skipable(int idx, struct llog_log_hdr *llh, + struct llog_process_cat_data *cd) +{ + if (cd && (cd->lpcd_read_mode & LLOG_READ_MODE_RAW)) + return false; + + return !test_bit_le(idx, LLOG_HDR_BITMAP(llh)); +} + +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; + struct llog_thread_info *lti; + 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; + bool repeated = false; + bool refresh_idx = false; + + ENTRY; + + if (llh == NULL) + RETURN(-EINVAL); + + lti = lpi->lpi_env == NULL ? NULL : llog_info(lpi->lpi_env); + + 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 && cd->lpcd_last_idx) + last_index = cd->lpcd_last_idx; + else if (cd && (cd->lpcd_read_mode & LLOG_READ_MODE_RAW)) + last_index = loghandle->lgh_last_idx; + else + last_index = LLOG_HDR_BITMAP_SIZE(llh) - 1; + + while (rc == 0) { + struct llog_rec_hdr *rec; + off_t chunk_offset = 0; + unsigned int buf_offset = 0; + int lh_last_idx; + int synced_idx = 0; + + /* skip records not set in bitmap */ + while (index <= last_index && + llog_is_index_skipable(index, llh, cd)) + ++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); + /* the record index for outdated chunk data */ + /* it is safe to process buffer until saved lgh_last_idx */ + lh_last_idx = LLOG_HDR_TAIL(llh)->lrt_index; + rc = llog_next_block(lpi->lpi_env, loghandle, &saved_index, + index, &cur_offset, buf, chunk_size); + if (repeated && rc) + CDEBUG(D_OTHER, "cur_offset %llu, chunk_offset %llu," + " buf_offset %u, rc = %d\n", cur_offset, + (__u64)chunk_offset, buf_offset, rc); + if (rc == -ESTALE) + GOTO(out, rc = 0); + /* we`ve tried to reread the chunk, but there is no + * new records */ + if (rc == -EIO && repeated && (chunk_offset + buf_offset) == + cur_offset) + GOTO(out, rc = 0); + 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 - 1)) != 0) + chunk_offset = cur_offset & ~(chunk_size - 1); + else + 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); + + if (index == (synced_idx + 1) && + synced_idx == LLOG_HDR_TAIL(llh)->lrt_index) + GOTO(out, rc = 0); + + if (OBD_FAIL_PRECHECK(OBD_FAIL_LLOG_PROCESS_TIMEOUT) && + cfs_fail_val == (unsigned int) + (loghandle->lgh_id.lgl_oi.oi.oi_id & + 0xFFFFFFFF)) { + OBD_RACE(OBD_FAIL_LLOG_PROCESS_TIMEOUT); + } + + /* the bitmap could be changed during processing + * records from the chunk. For wrapped catalog + * it means we can read deleted record and try to + * process it. Check this case and reread the chunk. + * It is safe to process to lh_last_idx, including + * lh_last_idx if it was synced. We can not do <= + * comparison, cause for wrapped catalog lgh_last_idx + * could be less than index. So we detect last index + * for processing as index == lh_last_idx+1. But when + * catalog is wrapped and full lgh_last_idx=llh_cat_idx, + * the first processing index is llh_cat_idx+1.The + * exception is !(lgh_last_idx == llh_cat_idx && + * index == llh_cat_idx + 1), and after simplification + * it turns to + * lh_last_idx != LLOG_HDR_TAIL(llh)->lrt_index + * This exception is working for catalog only. + */ + + if ((index == lh_last_idx && synced_idx != index) || + (index == (lh_last_idx + 1) && + lh_last_idx != LLOG_HDR_TAIL(llh)->lrt_index) || + (rec->lrh_index == 0 && !repeated)) { + + /* save offset inside buffer for the re-read */ + buf_offset = (char *)rec - (char *)buf; + cur_offset = chunk_offset; + repeated = true; + /* We need to be sure lgh_last_idx + * record was saved to disk + */ + down_read(&loghandle->lgh_last_sem); + synced_idx = LLOG_HDR_TAIL(llh)->lrt_index; + up_read(&loghandle->lgh_last_sem); + CDEBUG(D_OTHER, "synced_idx: %d\n", synced_idx); + goto repeat; + + } + + repeated = false; + + rc = llog_verify_record(loghandle, rec); + if (rc) { + CERROR("%s: invalid record in llog "DFID + " record for index %d/%d: rc = %d\n", + loghandle2name(loghandle), + PFID(&loghandle->lgh_id.lgl_oi.oi_fid), + rec->lrh_index, index, rc); + /* + * the block seem to be corrupted, let's try + * with the next one. reset rc to go to the + * next chunk. + */ + refresh_idx = true; + index = 0; + GOTO(repeat, rc = 0); + } + + if (rec->lrh_index < index) { + CDEBUG(D_OTHER, "skipping lrh_index %d\n", + rec->lrh_index); + continue; + } + + if (rec->lrh_index > index) { + /* the record itself looks good, but we met a + * gap which can be result of old bugs, just + * keep going */ + CERROR("%s: "DFID" index %u, expected %u\n", + loghandle2name(loghandle), + PFID(&loghandle->lgh_id.lgl_oi.oi_fid), + rec->lrh_index, index); + index = rec->lrh_index; + } + + CDEBUG(D_OTHER, + "lrh_index: %d lrh_len: %d (%d remains)\n", + rec->lrh_index, rec->lrh_len, + (int)(buf + chunk_size - (char *)rec)); + + /* lgh_cur_offset is used only at llog_test_3 */ + loghandle->lgh_cur_offset = (char *)rec - (char *)buf + + chunk_offset; + + /* if needed, process the callback on this record */ + if (!llog_is_index_skipable(index, llh, cd)) { + struct llog_cookie *lgc; + __u64 tmp_off; + int tmp_idx; + + CDEBUG((llh->llh_flags & LLOG_F_IS_CAT ? + D_HA : D_OTHER), + "index: %d, lh_last_idx: %d " + "synced_idx: %d lgh_last_idx: %d\n", + index, lh_last_idx, synced_idx, + loghandle->lgh_last_idx); + + if (lti != NULL) { + lgc = <i->lgi_cookie; + /* store lu_env for recursive calls */ + tmp_off = lgc->lgc_offset; + tmp_idx = lgc->lgc_index; + + lgc->lgc_offset = (char *)rec - + (char *)buf + chunk_offset; + lgc->lgc_index = rec->lrh_index; + } + /* using lu_env for passing record offset to + * llog_write through various callbacks */ + rc = lpi->lpi_cb(lpi->lpi_env, loghandle, rec, + lpi->lpi_cbdata); + last_called_index = index; + + if (lti != NULL) { + lgc->lgc_offset = tmp_off; + lgc->lgc_index = tmp_idx; + } + + if (rc == LLOG_PROC_BREAK || + rc == LLOG_SKIP_PLAIN) { + GOTO(out, rc); + } else if (rc == LLOG_DEL_RECORD) { + rc = llog_cancel_rec(lpi->lpi_env, + loghandle, + rec->lrh_index); + /* Allow parallel cancelling, ENOENT + * means record was canceled at another + * processing thread or callback + */ + if (rc == -ENOENT) + rc = 0; + } + if (rc) + GOTO(out, rc); + /* some stupid callbacks directly cancel records + * and delete llog. Check it and stop + * processing. */ + if (loghandle->lgh_hdr == NULL || + loghandle->lgh_hdr->llh_count == 1) + GOTO(out, rc = 0); + } + /* exit if the last index is reached */ + if (index >= last_index) + GOTO(out, rc = 0); + ++index; + } + } + +out: + CDEBUG(D_HA, "stop processing %s "DOSTID":%x index %d count %d\n", + ((llh->llh_flags & LLOG_F_IS_CAT) ? "catalog" : "plain"), + POSTID(&loghandle->lgh_id.lgl_oi), loghandle->lgh_id.lgl_ogen, + index, llh->llh_count); + + 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", + loghandle2name(loghandle)); + 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("%s: Local llog found corrupted #"DOSTID":%x" + " %s index %d count %d\n", + loghandle2name(loghandle), + POSTID(&loghandle->lgh_id.lgl_oi), + loghandle->lgh_id.lgl_ogen, + ((llh->llh_flags & LLOG_F_IS_CAT) ? "catalog" : + "plain"), index, llh->llh_count); + + while (index <= last_index) { + if (test_bit_le(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; +} + +static int llog_process_thread_daemonize(void *arg) +{ + struct llog_process_info *lpi = arg; + struct lu_env env; + int rc; + struct nsproxy *new_ns, *curr_ns = current->nsproxy; + + task_lock(lpi->lpi_reftask); + new_ns = lpi->lpi_reftask->nsproxy; + if (curr_ns != new_ns) { + get_nsproxy(new_ns); + + current->nsproxy = new_ns; + /* XXX: we should call put_nsproxy() instead of + * atomic_dec(&ns->count) directly. But put_nsproxy() cannot be + * used outside of the kernel itself, because it calls + * free_nsproxy() which is not exported by the kernel + * (defined in kernel/nsproxy.c) */ + if (curr_ns) + atomic_dec(&curr_ns->count); + } + task_unlock(lpi->lpi_reftask); + + /* 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; + + rc = llog_process_thread(arg); + + lu_env_fini(&env); +out: + complete(&lpi->lpi_completion); + return rc; +} + +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; + struct llog_process_data *d = data; + struct llog_process_cat_data *cd = catdata; + __u32 flags = loghandle->lgh_hdr->llh_flags; + int rc; + + 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; + + CDEBUG(D_OTHER, "Processing "DFID" flags 0x%03x startcat %d startidx %d first_idx %d last_idx %d read_mode %d\n", + PFID(&loghandle->lgh_id.lgl_oi.oi_fid), flags, + (flags & LLOG_F_IS_CAT) && d ? d->lpd_startcat : -1, + (flags & LLOG_F_IS_CAT) && d ? d->lpd_startidx : -1, + cd ? cd->lpcd_first_idx : -1, cd ? cd->lpcd_last_idx : -1, + cd ? cd->lpcd_read_mode : -1); + 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); + /* take reference to current, so that + * llog_process_thread_daemonize() can use it to switch to + * namespace associated with current */ + lpi->lpi_reftask = current; + 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", + loghandle2name(loghandle), 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_or_fork); + +int llog_process(const struct lu_env *env, struct llog_handle *loghandle, + llog_cb_t cb, void *data, void *catdata) +{ + int rc; + rc = llog_process_or_fork(env, loghandle, cb, data, catdata, true); + return rc == LLOG_DEL_PLAIN ? 0 : rc; +} +EXPORT_SYMBOL(llog_process); + +static inline const struct cred *llog_raise_resource(void) +{ + struct cred *cred = NULL; + + if (cap_raised(current_cap(), CAP_SYS_RESOURCE)) + return cred; + + cred = prepare_creds(); + if (!cred) + return cred; + + cap_raise(cred->cap_effective, CAP_SYS_RESOURCE); + return override_creds(cred); } -EXPORT_SYMBOL(llog_close); -int llog_process(struct llog_handle *loghandle, llog_cb_t cb, - void *data, void *catdata) +static inline void llog_restore_resource(const struct cred *old_cred) +{ + if (old_cred) + revert_creds(old_cred); +} + +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; + __u32 chunk_size = llh->llh_hdr.lrh_len; ENTRY; - OBD_ALLOC(buf, LLOG_CHUNK_SIZE); - if (!buf) - RETURN(-ENOMEM); - - if (cd != NULL) - 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; - - /* 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 = rec->lrh_index; - if (idx < index) - CDEBUG(D_HA, "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 && + llog_is_index_skipable(index, llh, cd)) + --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 = (struct llog_rec_hdr *) - ((char *)rec + 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 */ - - /* 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); - } + /* 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 needed, process the callback on this record */ + if (!llog_is_index_skipable(index, llh, cd)) { + rec = (void *)tail - tail->lrt_len + + sizeof(*tail); + + rc = cb(env, loghandle, rec, data); + if (rc == LLOG_PROC_BREAK || + rc == LLOG_SKIP_PLAIN) { + GOTO(out, rc); + } else if (rc == LLOG_DEL_RECORD) { + rc = llog_cancel_rec(env, loghandle, + tail->lrt_index); + } 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 = (struct llog_rec_hdr *) - ((char *)rec + rec->lrh_len); + tail = (void *)tail - tail->lrt_len; } } - out: - if (buf) - OBD_FREE(buf, LLOG_CHUNK_SIZE); +out: + if (buf != NULL) + OBD_FREE_LARGE(buf, 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) +{ + const 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) +{ + const struct cred *old_cred; + const struct llog_operations *lop; + int rc; + + ENTRY; + + rc = llog_handle2ops(loghandle, &lop); + if (rc) + RETURN(rc); + if (lop->lop_declare_create == NULL) + RETURN(-EOPNOTSUPP); + + old_cred = llog_raise_resource(); + rc = lop->lop_declare_create(env, loghandle, th); + llog_restore_resource(old_cred); + RETURN(rc); +} + +int llog_create(const struct lu_env *env, struct llog_handle *handle, + struct thandle *th) +{ + const struct cred *old_cred; + const struct llog_operations *lop; + int rc; + + ENTRY; + + rc = llog_handle2ops(handle, &lop); + if (rc) + RETURN(rc); + if (lop->lop_create == NULL) + RETURN(-EOPNOTSUPP); + + old_cred = llog_raise_resource(); + rc = lop->lop_create(env, handle, th); + llog_restore_resource(old_cred); + 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) +{ + const struct cred *old_cred; + const struct llog_operations *lop; + int rc; + + ENTRY; + + rc = llog_handle2ops(handle, &lop); + if (rc) + RETURN(rc); + LASSERT(lop); + if (lop->lop_declare_write_rec == NULL) + RETURN(-EOPNOTSUPP); + + old_cred = llog_raise_resource(); + rc = lop->lop_declare_write_rec(env, handle, rec, idx, th); + llog_restore_resource(old_cred); + 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) +{ + const struct cred *old_cred; + const struct llog_operations *lop; + int 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", + loghandle2name(handle)); + RETURN(-EPROTO); + } else if (handle->lgh_hdr == NULL) { + CERROR("%s: loghandle %p with no header\n", + loghandle2name(handle), 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); + + old_cred = llog_raise_resource(); + rc = lop->lop_write_rec(env, handle, rec, logcookies, idx, th); + llog_restore_resource(old_cred); + 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) +{ + const struct cred *old_cred; + int rc; + + ENTRY; + + if (lgh->lgh_logops->lop_add == NULL) + RETURN(-EOPNOTSUPP); + + old_cred = llog_raise_resource(); + rc = lgh->lgh_logops->lop_add(env, lgh, rec, logcookies, th); + llog_restore_resource(old_cred); + 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) +{ + const struct cred *old_cred; + int rc; + + ENTRY; + + if (lgh->lgh_logops->lop_declare_add == NULL) + RETURN(-EOPNOTSUPP); + + old_cred = llog_raise_resource(); + rc = lgh->lgh_logops->lop_declare_add(env, lgh, rec, th); + llog_restore_resource(old_cred); + 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); + + if (unlikely(unlikely(d->dd_rdonly))) + RETURN(-EROFS); + + 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; + bool need_cookie; + int rc; + + ENTRY; + + LASSERT(loghandle); + LASSERT(loghandle->lgh_ctxt); + LASSERT(loghandle->lgh_obj != NULL); + + dt = lu2dt_dev(loghandle->lgh_obj->do_lu.lo_dev); + + if (unlikely(unlikely(dt->dd_rdonly))) + RETURN(-EROFS); + + 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); + + need_cookie = !(idx == LLOG_HEADER_IDX || idx == LLOG_NEXT_IDX); + + down_write(&loghandle->lgh_lock); + if (need_cookie) { + struct llog_thread_info *lti = llog_info(env); + + /* cookie comes from llog_process_thread */ + rc = llog_write_rec(env, loghandle, rec, <i->lgi_cookie, + rec->lrh_index, th); + /* upper layer didn`t pass cookie so change rc */ + rc = (rc == 1 ? 0 : rc); + } else { + 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) +{ + const struct cred *old_cred; + 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; + + old_cred = llog_raise_resource(); + rc = ctxt->loc_logops->lop_open(env, *lgh, logid, name, open_param); + llog_restore_resource(old_cred); + 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) +{ + return llog_handle_put(env, loghandle); +} +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); + +/* this callback run in raw read mode (canceled record are processed) */ +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; + int idx = rec->lrh_index; + int rc; + + ENTRY; + + /* Append all records */ + rc = llog_write(env, copy_llh, rec, LLOG_NEXT_IDX); + + /* Cancel the record if it is canceled on the source */ + if (!rc && !test_bit_le(idx, LLOG_HDR_BITMAP(llh->lgh_hdr))) + rc = llog_cancel_rec(env, copy_llh, copy_llh->lgh_last_idx); + + RETURN(rc); +} + +/* 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; + struct llog_process_cat_data cd = {0}; + 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); + + /* Read canceled records to have an exact copy */ + cd.lpcd_read_mode = LLOG_READ_MODE_RAW; + /* Copy log record by record */ + rc = llog_process_or_fork(env, llh, llog_copy_handler, (void *)bllh, + &cd, 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 for "DFID": rc = %d\n", + loghandle2name(llh), PFID(&llh->lgh_id.lgl_oi.oi_fid), + rc); + return 0; + } + + return la.la_size; +} +EXPORT_SYMBOL(llog_size); +