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* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
/*
* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, 2015, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* lustre/obdclass/llog.c
*
* OST<->MDS recovery logging infrastructure.
* Invariants in implementation:
* - we do not share logs among different OST<->MDS connections, so that
* if an OST or MDS fails it need only look at log(s) relevant to itself
*
* Author: Andreas Dilger <adilger@clusterfs.com>
* Author: Alex Zhuravlev <bzzz@whamcloud.com>
* Author: Mikhail Pershin <tappro@whamcloud.com>
*/
#define DEBUG_SUBSYSTEM S_LOG
#include "../include/llog_swab.h"
#include "../include/lustre_log.h"
#include "../include/obd_class.h"
#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;
loghandle = kzalloc(sizeof(*loghandle), GFP_NOFS);
if (!loghandle)
return NULL;
init_rwsem(&loghandle->lgh_lock);
spin_lock_init(&loghandle->lgh_hdr_lock);
INIT_LIST_HEAD(&loghandle->u.phd.phd_entry);
atomic_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)
{
/* failed llog_init_handle */
if (!loghandle->lgh_hdr)
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));
kvfree(loghandle->lgh_hdr);
out:
kfree(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_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)
return -EOPNOTSUPP;
rc = lop->lop_read_header(env, handle);
if (rc == LLOG_EEMPTY) {
struct llog_log_hdr *llh = handle->lgh_hdr;
size_t len;
/* 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
*/
len = llh->llh_hdr.lrh_len - llh->llh_bitmap_offset;
memset(LLOG_HDR_BITMAP(llh), 0, len - 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;
}
int llog_init_handle(const struct lu_env *env, struct llog_handle *handle,
int flags, struct obd_uuid *uuid)
{
int chunk_size = handle->lgh_ctxt->loc_chunk_size;
enum llog_flag fmt = flags & LLOG_F_EXT_MASK;
struct llog_log_hdr *llh;
int rc;
LASSERT(!handle->lgh_hdr);
LASSERT(chunk_size >= LLOG_MIN_CHUNK_SIZE);
llh = libcfs_kvzalloc(sizeof(*llh), GFP_NOFS);
if (!llh)
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");
rc = -EINVAL;
goto out;
} 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");
rc = -EINVAL;
goto out;
}
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);
rc = -EEXIST;
goto out;
}
}
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) {
kvfree(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, tmp_offset;
int chunk_size;
int rc = 0, index = 1, last_index;
int saved_index = 0;
int last_called_index = 0;
if (!llh)
return -EINVAL;
cur_offset = llh->llh_hdr.lrh_len;
chunk_size = llh->llh_hdr.lrh_len;
/* expect chunk_size to be power of two */
LASSERT(is_power_of_2(chunk_size));
buf = libcfs_kvzalloc(chunk_size, GFP_NOFS);
if (!buf) {
lpi->lpi_rc = -ENOMEM;
return 0;
}
if (cd) {
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
last_index = LLOG_HDR_BITMAP_SIZE(llh) - 1;
while (rc == 0) {
unsigned int buf_offset = 0;
struct llog_rec_hdr *rec;
bool partial_chunk;
off_t chunk_offset;
/* skip records not set in bitmap */
while (index <= last_index &&
!ext2_test_bit(index, LLOG_HDR_BITMAP(llh)))
++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)
goto out;
/*
* 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)) {
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) {
/* concurrent llog_add() might add new records
* while llog_processing, check this is not
* the case and re-read the current chunk
* otherwise.
*/
if (index > loghandle->lgh_last_idx) {
rc = 0;
goto out;
}
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 || rec->lrh_len > chunk_size) {
CWARN("invalid length %d in llog record for index %d/%d\n",
rec->lrh_len,
rec->lrh_index, index);
rc = -EINVAL;
goto out;
}
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);
rc = -ERANGE;
goto out;
}
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)
goto out;
}
/* exit if the last index is reached */
if (index >= last_index) {
rc = 0;
goto out;
}
index++;
}
}
out:
if (cd)
cd->lpcd_last_idx = last_called_index;
kfree(buf);
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;
unshare_fs_struct();
/* 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;
int rc;
lpi = kzalloc(sizeof(*lpi), GFP_NOFS);
if (!lpi)
return -ENOMEM;
lpi->lpi_loghandle = loghandle;
lpi->lpi_cb = cb;
lpi->lpi_cbdata = data;
lpi->lpi_catdata = catdata;
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;
}
wait_for_completion(&lpi->lpi_completion);
} else {
lpi->lpi_env = env;
llog_process_thread(lpi);
}
rc = lpi->lpi_rc;
out_lpi:
kfree(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)
{
return llog_process_or_fork(env, loghandle, cb, data, catdata, true);
}
EXPORT_SYMBOL(llog_process);
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;
LASSERT(ctxt);
LASSERT(ctxt->loc_logops);
if (!ctxt->loc_logops->lop_open) {
*lgh = NULL;
return -EOPNOTSUPP;
}
*lgh = llog_alloc_handle();
if (!*lgh)
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;
rc = llog_handle2ops(loghandle, &lop);
if (rc)
goto out;
if (!lop->lop_close) {
rc = -EOPNOTSUPP;
goto out;
}
rc = lop->lop_close(env, loghandle);
out:
llog_handle_put(loghandle);
return rc;
}
EXPORT_SYMBOL(llog_close);
|