Viewing: llog.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*
* 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 <linux/fs_struct.h>
#include <linux/pid_namespace.h>
#include <linux/kthread.h>
#include <llog_swab.h>
#include <lustre_log.h>
#include <obd_support.h>
#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;
OBD_ALLOC_PTR(loghandle);
if (loghandle == NULL)
return NULL;
init_rwsem(&loghandle->lgh_lock);
spin_lock_init(&loghandle->lgh_hdr_lock);
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)
{
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;
}
int llog_handle_put(const struct lu_env *env, struct llog_handle *loghandle)
{
int rc = 0;
if (refcount_dec_and_test(&loghandle->lgh_refcount)) {
const struct llog_operations *lop;
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;
}
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);
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)
{
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);
rc = lop->lop_destroy(env, handle, th);
RETURN(rc);
}
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 (IS_ERR(dt))
RETURN(PTR_ERR(dt));
if (unlikely(unlikely(dt->dd_rdonly)))
RETURN(-EROFS);
th = dt_trans_create(env, dt);
if (IS_ERR(th))
RETURN(PTR_ERR(th));
th->th_wait_submit = 1;
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_arr_rec(const struct lu_env *env, struct llog_handle *loghandle,
int num, int *index)
{
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 old_cat = -1;
int rc, i = 0;
int rc1;
bool subtract_count = false;
ENTRY;
LASSERT(loghandle != NULL);
LASSERT(loghandle->lgh_ctxt != NULL);
LASSERT(loghandle->lgh_obj != NULL);
llh = loghandle->lgh_hdr;
CDEBUG(D_OTHER, "Canceling %d records, first %d in log "DFID"\n",
num, index[0], PLOGID(&loghandle->lgh_id));
dt = lu2dt_dev(loghandle->lgh_obj->do_lu.lo_dev);
if (IS_ERR(dt))
RETURN(PTR_ERR(dt));
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);
}
if (llh->llh_flags & LLOG_F_IS_CAT)
dt_declare_attr_set(env, loghandle->lgh_obj, NULL, th);
th->th_wait_submit = 1;
rc = dt_trans_start_local(env, dt, th);
if (rc < 0)
GOTO(out_trans, rc);
down_write(&loghandle->lgh_lock);
/* clear bitmap */
spin_lock(&loghandle->lgh_hdr_lock);
for (i = 0; i < num; ++i) {
if (index[i] == 0) {
spin_unlock(&loghandle->lgh_hdr_lock);
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))) {
spin_unlock(&loghandle->lgh_hdr_lock);
CDEBUG(D_OTHER, "Catalog index %u already clear?\n",
index[i]);
GOTO(out_unlock, rc = -ENOENT);
}
}
loghandle->lgh_hdr->llh_count -= num;
subtract_count = true;
spin_unlock(&loghandle->lgh_hdr_lock);
if (llh->llh_flags & LLOG_F_IS_CAT) {
old_cat = llh->llh_cat_idx;
llog_cat_set_first_idx(loghandle, index[0]);
}
/* 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_max_idx(loghandle)) ||
(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),
PLOGID(&loghandle->lgh_id), rc);
GOTO(out_unlock, rc = 0);
}
rc = LLOG_DEL_PLAIN;
}
/* update for catalog which doesn't happen very often */
if (llh->llh_flags & LLOG_F_IS_CAT) {
lgi->lgi_attr.la_valid = LA_MTIME;
lgi->lgi_attr.la_mtime = ktime_get_real_seconds();
dt_attr_set(env, loghandle->lgh_obj, &lgi->lgi_attr, th);
}
out_unlock:
if (rc < 0) {
if (old_cat != -1) {
llh->llh_cat_idx = old_cat;
old_cat = -1;
}
/* restore bitmap while holding a mutex */
spin_lock(&loghandle->lgh_hdr_lock);
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));
spin_unlock(&loghandle->lgh_hdr_lock);
}
up_write(&loghandle->lgh_lock);
out_trans:
rc1 = dt_trans_stop(env, dt, th);
if (rc == 0)
rc = rc1;
if (rc1 < 0) {
if (old_cat != -1)
llh->llh_cat_idx = old_cat;
spin_lock(&loghandle->lgh_hdr_lock);
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));
spin_unlock(&loghandle->lgh_hdr_lock);
}
RETURN(rc);
}
int llog_cancel_rec(const struct lu_env *env, struct llog_handle *loghandle,
int index)
{
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;
handle->lgh_cur_offset = llh->llh_hdr.lrh_len;
rc = 0;
}
if (handle->lgh_max_index == 0)
handle->lgh_max_index =
LLOG_HDR_BITMAP_SIZE(handle->lgh_hdr) - 1;
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 = -EINVAL);
}
}
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;
/* Fixing llh_cat_idx if it has problem */
if (rc == 0)
llog_cat_set_first_idx(handle, llh->llh_cat_idx);
} 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 (rc) {
OBD_FREE_LARGE(llh, chunk_size);
handle->lgh_hdr = NULL;
}
RETURN(rc);
}
EXPORT_SYMBOL(llog_init_handle);
#define LLOG_ERROR_REC(lgh, rec, format, a...) \
CDEBUG(D_OTHER, "%s: "DFID" rec type=%x idx=%u len=%u, " format "\n", \
loghandle2name(lgh), PLOGID(&lgh->lgh_id), (rec)->lrh_type, \
(rec)->lrh_index, (rec)->lrh_len, ##a)
int llog_verify_record(const struct llog_handle *llh, struct llog_rec_hdr *rec)
{
int chunk_size = llh->lgh_hdr->llh_hdr.lrh_len;
if ((rec->lrh_type & LLOG_OP_MASK) != LLOG_OP_MAGIC)
LLOG_ERROR_REC(llh, rec, "magic is bad");
else if (rec->lrh_len == 0 || rec->lrh_len > chunk_size ||
rec->lrh_len < LLOG_MIN_REC_SIZE)
LLOG_ERROR_REC(llh, rec, "bad record len, chunk size is %d",
chunk_size);
else if (rec->lrh_index > llog_max_idx(llh))
LLOG_ERROR_REC(llh, rec, "index is too high");
else
return 0;
return -EINVAL;
}
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 inline int llog_skip_gap(struct llog_rec_hdr *start, char *end)
{
struct llog_rec_hdr *rec = start;
/* skipping zero gap */
while ((rec->lrh_index == 0 || rec->lrh_len == 0) &&
(char *)rec < (char *)end)
rec = (typeof(rec))(((char *)rec) + 4);
if ((char *)rec > end ||
!((rec->lrh_type & LLOG_OP_MASK) == LLOG_OP_MAGIC ||
((rec->lrh_type & __swab32(LLOG_OP_MASK)) ==
__swab32(LLOG_OP_MAGIC))))
return -ENOENT;
return (int)((char *)rec - (char *)start);
}
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;
struct lu_env *env = NULL, _env;
ENTRY;
if (llh == NULL)
RETURN(-EINVAL);
/*
* this can be called as a separate thread processing llog or
* as a part of more functional thread like osp sync thread with
* an existing env
*/
env = lu_env_find();
if (env == NULL) {
rc = lu_env_init(&_env, LCT_DT_THREAD | LCT_MD_THREAD);
if (rc)
RETURN(rc);
env = &_env;
rc = lu_env_add(&_env);
if (unlikely(rc))
GOTO(out_fini, rc);
}
lti = llog_info(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 (unlikely(buf == NULL))
GOTO(out_env, rc = -ENOMEM);
last_index = llog_max_idx(loghandle);
if (cd) {
if (cd->lpcd_first_idx >= llog_max_idx(loghandle))
/* End of the indexes -> Nothing to do */
GOTO(out, rc = 0);
index = cd->lpcd_first_idx + 1;
last_called_index = cd->lpcd_first_idx;
if (cd->lpcd_last_idx > 0 &&
cd->lpcd_last_idx <= llog_max_idx(loghandle))
last_index = cd->lpcd_last_idx;
else if (cd->lpcd_read_mode & LLOG_READ_MODE_RAW)
last_index = loghandle->lgh_last_idx;
}
while (rc == 0) {
struct llog_rec_hdr *rec;
off_t chunk_offset = 0;
off_t last_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(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 (repeated && (chunk_offset + buf_offset) == cur_offset &&
(rc == -EBADR || rc == -EIO))
GOTO(out, rc = 0);
/* EOF while trying to skip to the next chunk */
if (!index && rc == -EBADR)
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.
*/
last_chunk_offset = chunk_offset;
if ((cur_offset & (chunk_size - 1)) != 0)
chunk_offset = cur_offset & ~(chunk_size - 1);
else
chunk_offset = cur_offset - chunk_size;
/* When reread a chunk with zeores at the end, it could
* happened that index was found at next chunk. Start
* processing from a beginning.
*/
if (last_chunk_offset != chunk_offset)
buf_offset = 0;
/* 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 - LLOG_MIN_REC_SIZE;
rec = llog_rec_hdr_next(rec)) {
if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
lustre_swab_llog_rec(rec);
CDEBUG(D_OTHER, "processing rec 0x%px type=%#x idx=%d\n",
rec, rec->lrh_type, rec->lrh_index);
/* start with first rec if block was skipped */
if (!index) {
CDEBUG(D_OTHER,
"%s: skipping to the index %u\n",
loghandle2name(loghandle),
rec->lrh_index);
index = rec->lrh_index;
}
if (index == (synced_idx + 1) &&
synced_idx == LLOG_HDR_TAIL(llh)->lrt_index)
GOTO(out, rc = 0);
if (CFS_FAIL_PRECHECK(OBD_FAIL_LLOG_PROCESS_TIMEOUT) &&
cfs_fail_val == (unsigned int)
(loghandle->lgh_id.lgl_oi.oi.oi_id &
0xFFFFFFFF)) {
CFS_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.
* The last check is for the partial chunk boundary,
* if it is reached then try to re-read for possible
* new records once.
*/
if ((index == lh_last_idx && synced_idx != index) ||
(index == (lh_last_idx + 1) &&
lh_last_idx != LLOG_HDR_TAIL(llh)->lrt_index) ||
(((char *)rec - buf >= cur_offset - chunk_offset) &&
!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) {
int gap_size;
CDEBUG(D_OTHER, "invalid record at index %d\n",
index);
/*
* for fixed-sized llogs we can skip one record
* by using llh_size from llog header.
*/
rc = 0;
if (llh->llh_flags & LLOG_F_IS_FIXSIZE) {
rec->lrh_len = llh->llh_size;
goto next_rec;
}
/*
* for zero gap we can find a next record.
* Otherwise skip the next llog chunk.
*/
gap_size = llog_skip_gap(rec, buf + chunk_size -
LLOG_MIN_REC_SIZE);
if (gap_size > 0) {
rec->lrh_len = gap_size;
goto next_rec;
}
/* make sure that is always next block */
cur_offset = chunk_offset + chunk_size;
/* no goal to find, just next block to read */
index = 0;
break;
}
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 */
LLOG_ERROR_REC(loghandle, rec,
"gap in index, expected %u",
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 and
* changelog
*/
if (unlikely(loghandle->lgh_ctxt->loc_idx ==
LLOG_TEST_ORIG_CTXT))
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(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(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);
}
next_rec:
/* exit if the last index is reached */
if (index >= last_index)
GOTO(out, rc = 0);
++index;
}
}
out:
CDEBUG(D_HA, "stop processing %s "DFID" index %d count %d\n",
((llh->llh_flags & LLOG_F_IS_CAT) ? "catalog" : "plain"),
PLOGID(&loghandle->lgh_id), index, llh->llh_count);
if (cd != NULL)
cd->lpcd_last_idx = last_called_index;
if ((rc == -EIO || rc == -EINVAL) && 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 is corrupted "DFID" %s index %d count %d\n",
loghandle2name(loghandle),
PLOGID(&loghandle->lgh_id),
((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(env, loghandle,
index);
index++;
}
rc = 0;
}
}
OBD_FREE_LARGE(buf, chunk_size);
out_env:
if (env == &_env) {
lu_env_remove(&_env);
out_fini:
lu_env_fini(&_env);
}
lpi->lpi_rc = rc;
return 0;
}
static int llog_process_thread_daemonize(void *arg)
{
struct llog_process_info *lpi = arg;
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)
nsproxy_dec(curr_ns);
}
task_unlock(lpi->lpi_reftask);
unshare_fs_struct();
rc = llog_process_thread(arg);
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",
PLOGID(&loghandle->lgh_id), 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. */
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 {
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);
}
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;
int rc = 0, first_index = 1, index, idx;
__u32 chunk_size = llh->llh_hdr.lrh_len;
ENTRY;
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_max_idx(loghandle);
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 = (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 *)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);
}
/* previous record, still in buffer? */
--index;
if (index < first_index)
GOTO(out, rc = 0);
tail = (void *)tail - tail->lrt_len;
}
}
out:
if (buf != NULL)
OBD_FREE_LARGE(buf, chunk_size);
RETURN(rc);
}
EXPORT_SYMBOL(llog_reverse_process);
/**
* llog_exist() - new llog API
* @loghandle: llog handle of the current llog
*
* 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
*
* Return:
* * %0 on success
* * %negative on error
*/
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(round_up(buflen, 8) == 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);
/**
* llog_open_create() - open/create llog
* @env: current lustre environment
* @ctxt: llog context
* @res: llog handle of the newly created/open llog [out]
* @logid: llog unique id
* @name: llog name
*
* Helper function to open llog or create it if doesn't exist.
* It hides all transaction handling from caller.
*
* Return:
* * %0 on success
* * %negative on error
*/
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 (IS_ERR(d))
GOTO(out, rc = PTR_ERR(d));
if (unlikely(unlikely(d->dd_rdonly)))
GOTO(out, rc = -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);
/**
* llog_erase() - Helper function to delete existent llog.
* @env: current lustre environment
* @ctxt: llog context
* @logid: llog unique id
* @name: llog name
*
* Return:
* * %0 on success
* * %negative on error
*/
int llog_erase(const struct lu_env *env, struct llog_ctxt *ctxt,
struct llog_logid *logid, char *name)
{
struct llog_handle *handle;
int rc;
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_destroy(env, handle);
llog_close(env, handle);
RETURN(rc);
}
EXPORT_SYMBOL(llog_erase);
/*
* Get record cookie, with record file offset, should be called only by
* llog_process_thread() callbacks.
*/
void llog_get_cookie(const struct lu_env *env, struct llog_cookie *out)
{
struct llog_thread_info *lti = llog_info(env);
LASSERT(out && env && lti);
memcpy(out, <i->lgi_cookie, sizeof(lti->lgi_cookie));
return;
}
EXPORT_SYMBOL(llog_get_cookie);
/**
* llog_write_cookie() - write record in llog with a custom cookie.
* @env: execution environment
* @loghandle: llog handle of the current llog
* @rec: llog record header. This is a real header of
* the full llog record to write. This is
* the beginning of buffer to write, the length
* of buffer is stored in @rec::lrh_len
* @cookie: pointer to the cookie to return back if needed.
* It is used for further cancel of this llog
* record. [in, out]
* @idx: index of the llog record. If @idx == -1 then
* this is append case, otherwise @idx is
* the index of record to modify
* Helper function for write record in llog with a custom cookie.
* It hides all transaction handling from caller.
* Valid only with local llog.
*
* Return:
* * %0 on successful write && @cookie == NULL
* * %1 on successful write && @cookie != NULL
* * %negative error if write failed
*/
int llog_write_cookie(const struct lu_env *env, struct llog_handle *loghandle,
struct llog_rec_hdr *rec, struct llog_cookie *cookie,
int idx)
{
struct dt_device *dt;
struct thandle *th;
struct llog_thread_info *lgi = llog_info(env);
bool need_cookie;
bool update_attr;
unsigned long timestamp;
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 (IS_ERR(dt))
RETURN(PTR_ERR(dt));
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);
/*
* update mtime given 1) append mode, no overhead since inode
* size/block needs to be written anyway; 2) update for catalog
* since this doesn't happen very often
*/
timestamp = ktime_get_real_seconds();
update_attr = (timestamp != loghandle->lgh_timestamp) &&
(idx == LLOG_NEXT_IDX ||
(loghandle->lgh_hdr &&
loghandle->lgh_hdr->llh_flags & LLOG_F_IS_CAT));
if (update_attr)
dt_declare_attr_set(env, loghandle->lgh_obj, NULL, th);
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 && !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, cookie, idx, th);
}
if (rc == 0 && update_attr) {
loghandle->lgh_timestamp = timestamp;
lgi->lgi_attr.la_valid = LA_MTIME;
lgi->lgi_attr.la_mtime = timestamp;
dt_attr_set(env, loghandle->lgh_obj, &lgi->lgi_attr, th);
}
up_write(&loghandle->lgh_lock);
out_trans:
dt_trans_stop(env, dt, th);
RETURN(rc);
}
EXPORT_SYMBOL(llog_write_cookie);
int llog_write(const struct lu_env *env, struct llog_handle *loghandle,
struct llog_rec_hdr *rec, int idx)
{
return llog_write_cookie(env, loghandle, rec, NULL, idx);
}
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) {
CDEBUG(D_OTHER, "%s: Failed to open llog %s: rc %d\n",
ctxt->loc_obd->obd_name, name ? name : "", 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);
/**
* llog_is_empty() - get the llog size in records
* @env: execution environment
* @ctxt: llog context
* @name: llog name
*
* Helper function to get the llog size in records. It is used by MGS
* mostly to check that config llog exists and contains data.
*
* Return:
* * %true if there are records in llog besides a header
* * %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;
if (CFS_FAIL_CHECK(OBD_FAIL_LLOG_BACKUP_ENOSPC))
RETURN(-ENOSPC);
/* 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,
&llh->lgh_hdr->llh_tgtuuid);
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);
/* just count processed records */
static inline int llog_validate_record(const struct lu_env *env,
struct llog_handle *llh,
struct llog_rec_hdr *rec, void *data)
{
int *recs = data;
(*recs)++;
return 0;
}
/* validate plain llog by reading all its records */
int llog_validate(const struct lu_env *env, struct llog_ctxt *ctxt, char *name)
{
struct llog_handle *llh;
struct llog_process_cat_data cd = { 0 };
unsigned int recs;
unsigned int processed = 1; /* one for header */
int rc;
ENTRY;
rc = llog_open(env, ctxt, &llh, NULL, name, LLOG_OPEN_EXISTS);
if (rc < 0)
RETURN(rc);
rc = llog_init_handle(env, llh, LLOG_F_IS_PLAIN, NULL);
if (rc)
GOTO(out_close, rc);
recs = llog_get_size(llh);
if (recs <= 1)
GOTO(out_close, rc = -ENOENT);
rc = llog_process_or_fork(env, llh, llog_validate_record, &processed,
&cd, false);
if (rc) {
CWARN("%s: can't validate log %s: rc = %d\n",
ctxt->loc_obd->obd_name, name, rc);
} else if (recs != processed) {
rc = -EINVAL;
CWARN("%s: %s has %d recs but %d were processed: rc = %d\n",
ctxt->loc_obd->obd_name, name, recs, processed, rc);
}
out_close:
llog_close(env, llh);
RETURN(rc);
}
EXPORT_SYMBOL(llog_validate);
/* set llog ctime to current, and set LLOG_F_RM_ON_ERR|LLOG_F_MAX_AGE flag in
* log header. It will be reclaimed when expired (UPDATE_LOG_MAX_AGE old).
*/
int llog_retain(const struct lu_env *env, struct llog_handle *log)
{
struct dt_object *dto = log->lgh_obj;
struct dt_device *dt;
struct lu_attr la = { 0 };
struct thandle *th;
int rc;
la.la_ctime = ktime_get_real_seconds();
la.la_valid = LA_CTIME;
dt = lu2dt_dev(log->lgh_obj->do_lu.lo_dev);
if (IS_ERR(dt))
RETURN(PTR_ERR(dt));
th = dt_trans_create(env, dt);
if (IS_ERR(th))
return PTR_ERR(th);
th->th_wait_submit = 1;
log->lgh_hdr->llh_flags |= LLOG_F_MAX_AGE | LLOG_F_RM_ON_ERR;
rc = llog_declare_write_rec(env, log, &log->lgh_hdr->llh_hdr, -1, th);
if (rc)
goto out_trans;
rc = dt_declare_attr_set(env, dto, &la, th);
if (rc)
goto out_trans;
rc = dt_trans_start_local(env, dt, th);
if (rc)
goto out_trans;
rc = llog_write_rec(env, log, &log->lgh_hdr->llh_hdr, NULL,
LLOG_HEADER_IDX, th);
if (rc)
goto out_trans;
rc = dt_attr_set(env, dto, &la, th);
out_trans:
dt_trans_stop(env, dt, th);
CDEBUG(D_OTHER, "retain log "DFID" rc = %d\n",
PLOGID(&log->lgh_id), rc);
return rc;
}
EXPORT_SYMBOL(llog_retain);
