int llog_read_header(const struct lu_env *env, struct llog_handle *handle,
const struct obd_uuid *uuid)
{
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 */
handle->lgh_write_offset = 0;
llh->llh_count = 1; /* for the header record */
llh->llh_hdr.lrh_type = LLOG_HDR_MAGIC;
LASSERT(handle->lgh_ctxt->loc_chunk_size >=
LLOG_MIN_CHUNK_SIZE);
llh->llh_hdr.lrh_len = handle->lgh_ctxt->loc_chunk_size;
llh->llh_hdr.lrh_index = 0;
llh->llh_timestamp = cfs_time_current_sec();
if (uuid)
memcpy(&llh->llh_tgtuuid, uuid,
sizeof(llh->llh_tgtuuid));
llh->llh_bitmap_offset = offsetof(typeof(*llh), llh_bitmap);
/* Since update llog header might also call this function,
* let's reset the bitmap to 0 here */
memset(LLOG_HDR_BITMAP(llh), 0, llh->llh_hdr.lrh_len -
llh->llh_bitmap_offset -
sizeof(llh->llh_tail));
ext2_set_bit(0, LLOG_HDR_BITMAP(llh));
LLOG_HDR_TAIL(llh)->lrt_len = llh->llh_hdr.lrh_len;
LLOG_HDR_TAIL(llh)->lrt_index = llh->llh_hdr.lrh_index;
rc = 0;
}
RETURN(rc);
}
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_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 &&
!ext2_test_bit(index, LLOG_HDR_BITMAP(llh)))
--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 set, process the callback on this record */
if (ext2_test_bit(index, LLOG_HDR_BITMAP(llh))) {
rec = (void *)tail - tail->lrt_len +
sizeof(*tail);
rc = cb(env, loghandle, rec, data);
if (rc == LLOG_PROC_BREAK) {
GOTO(out, rc);
} else if (rc == LLOG_DEL_RECORD) {
rc = llog_cancel_rec(env, loghandle,
tail->lrt_index);
}
if (rc)
GOTO(out, rc);
}
/* 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);
}
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;
size_t chunk_size;
__u64 cur_offset, tmp_offset;
int rc = 0, index = 1, last_index;
int saved_index = 0;
int last_called_index = 0;
ENTRY;
if (llh == NULL)
RETURN(-EINVAL);
cur_offset = chunk_size = llh->llh_hdr.lrh_len;
/* expect chunk_size to be power of two */
LASSERT(is_power_of_2(chunk_size));
OBD_ALLOC_LARGE(buf, chunk_size);
if (buf == NULL) {
lpi->lpi_rc = -ENOMEM;
RETURN(0);
}
if (cd != NULL) {
last_called_index = cd->lpcd_first_idx;
index = cd->lpcd_first_idx + 1;
}
if (cd != NULL && cd->lpcd_last_idx)
last_index = cd->lpcd_last_idx;
else
last_index = LLOG_HDR_BITMAP_SIZE(llh) - 1;
while (rc == 0) {
struct llog_rec_hdr *rec;
off_t chunk_offset;
unsigned int buf_offset = 0;
bool partial_chunk;
/* skip records not set in bitmap */
while (index <= last_index &&
!ext2_test_bit(index, LLOG_HDR_BITMAP(llh)))
++index;
/* There are no indices prior the last_index */
if (index > last_index)
break;
CDEBUG(D_OTHER, "index: %d last_index %d\n", index,
last_index);
repeat:
/* get the buf with our target record; avoid old garbage */
memset(buf, 0, chunk_size);
rc = llog_next_block(lpi->lpi_env, loghandle, &saved_index,
index, &cur_offset, buf, chunk_size);
if (rc != 0)
GOTO(out, rc);
/* NB: after llog_next_block() call the cur_offset is the
* offset of the next block after read one.
* The absolute offset of the current chunk is calculated
* from cur_offset value and stored in chunk_offset variable.
*/
tmp_offset = cur_offset;
if (do_div(tmp_offset, chunk_size) != 0) {
partial_chunk = true;
chunk_offset = cur_offset & ~(chunk_size - 1);
} else {
partial_chunk = false;
chunk_offset = cur_offset - chunk_size;
}
/* NB: when rec->lrh_len is accessed it is already swabbed
* since it is used at the "end" of the loop and the rec
* swabbing is done at the beginning of the loop. */
for (rec = (struct llog_rec_hdr *)(buf + buf_offset);
(char *)rec < buf + chunk_size;
rec = llog_rec_hdr_next(rec)) {
CDEBUG(D_OTHER, "processing rec 0x%p type %#x\n",
rec, rec->lrh_type);
if (LLOG_REC_HDR_NEEDS_SWABBING(rec))
lustre_swab_llog_rec(rec);
CDEBUG(D_OTHER, "after swabbing, type=%#x idx=%d\n",
rec->lrh_type, rec->lrh_index);
/* for partial chunk the end of it is zeroed, check
* for index 0 to distinguish it. */
if (partial_chunk && rec->lrh_index == 0) {
/* concurrent llog_add() might add new records
* while llog_processing, check this is not
* the case and re-read the current chunk
* otherwise. */
if (index > loghandle->lgh_last_idx)
GOTO(out, rc = 0);
CDEBUG(D_OTHER, "Re-read last llog buffer for "
"new records, index %u, last %u\n",
index, loghandle->lgh_last_idx);
/* save offset inside buffer for the re-read */
buf_offset = (char *)rec - (char *)buf;
cur_offset = chunk_offset;
goto repeat;
}
if (rec->lrh_len == 0 || rec->lrh_len > chunk_size) {
CWARN("invalid length %d in llog record for "
"index %d/%d\n", rec->lrh_len,
rec->lrh_index, index);
GOTO(out, rc = -EINVAL);
}
if (rec->lrh_index < index) {
CDEBUG(D_OTHER, "skipping lrh_index %d\n",
rec->lrh_index);
continue;
}
if (rec->lrh_index != index) {
CERROR("%s: Invalid record: index %u but "
"expected %u\n",
loghandle->lgh_ctxt->loc_obd->obd_name,
rec->lrh_index, index);
GOTO(out, rc = -ERANGE);
}
CDEBUG(D_OTHER,
"lrh_index: %d lrh_len: %d (%d remains)\n",
rec->lrh_index, rec->lrh_len,
(int)(buf + chunk_size - (char *)rec));
loghandle->lgh_cur_idx = rec->lrh_index;
loghandle->lgh_cur_offset = (char *)rec - (char *)buf +
chunk_offset;
/* if set, process the callback on this record */
if (ext2_test_bit(index, LLOG_HDR_BITMAP(llh))) {
rc = lpi->lpi_cb(lpi->lpi_env, loghandle, rec,
lpi->lpi_cbdata);
last_called_index = index;
if (rc == LLOG_PROC_BREAK) {
GOTO(out, rc);
} else if (rc == LLOG_DEL_RECORD) {
rc = llog_cancel_rec(lpi->lpi_env,
loghandle,
rec->lrh_index);
}
if (rc)
GOTO(out, rc);
}
/* exit if the last index is reached */
if (index >= last_index)
GOTO(out, rc = 0);
++index;
}
}
out:
if (cd != NULL)
cd->lpcd_last_idx = last_called_index;
if (unlikely(rc == -EIO && loghandle->lgh_obj != NULL)) {
if (dt_object_remote(loghandle->lgh_obj)) {
/* If it is remote object, then -EIO might means
* disconnection or eviction, let's return -EAGAIN,
* so for update recovery log processing, it will
* retry until the umount or abort recovery, see
* lod_sub_recovery_thread() */
CERROR("%s retry remote llog process\n",
loghandle->lgh_ctxt->loc_obd->obd_name);
rc = -EAGAIN;
} else {
/* something bad happened to the processing of a local
* llog file, probably I/O error or the log got
* corrupted to be able to finally release the log we
* discard any remaining bits in the header */
CERROR("Local llog found corrupted\n");
while (index <= last_index) {
if (ext2_test_bit(index,
LLOG_HDR_BITMAP(llh)) != 0)
llog_cancel_rec(lpi->lpi_env, loghandle,
index);
index++;
}
rc = 0;
}
}
OBD_FREE_LARGE(buf, chunk_size);
lpi->lpi_rc = rc;
return 0;
}
/* returns negative on error; 0 if success; 1 if success & log destroyed */
int llog_cancel_rec(const struct lu_env *env, struct llog_handle *loghandle,
int index)
{
struct llog_thread_info *lgi = llog_info(env);
struct dt_device *dt;
struct llog_log_hdr *llh = loghandle->lgh_hdr;
struct thandle *th;
int rc;
int rc1;
bool subtract_count = false;
ENTRY;
CDEBUG(D_RPCTRACE, "Canceling %d in log "DOSTID"\n", index,
POSTID(&loghandle->lgh_id.lgl_oi));
if (index == 0) {
CERROR("Can't cancel index 0 which is header\n");
RETURN(-EINVAL);
}
LASSERT(loghandle != NULL);
LASSERT(loghandle->lgh_ctxt != NULL);
LASSERT(loghandle->lgh_obj != NULL);
dt = lu2dt_dev(loghandle->lgh_obj->do_lu.lo_dev);
th = dt_trans_create(env, dt);
if (IS_ERR(th))
RETURN(PTR_ERR(th));
rc = llog_declare_write_rec(env, loghandle, &llh->llh_hdr, index, th);
if (rc < 0)
GOTO(out_trans, rc);
if ((llh->llh_flags & LLOG_F_ZAP_WHEN_EMPTY))
rc = llog_declare_destroy(env, loghandle, th);
th->th_wait_submit = 1;
rc = dt_trans_start_local(env, dt, th);
if (rc < 0)
GOTO(out_trans, rc);
down_write(&loghandle->lgh_lock);
/* clear bitmap */
mutex_lock(&loghandle->lgh_hdr_mutex);
if (!ext2_clear_bit(index, LLOG_HDR_BITMAP(llh))) {
CDEBUG(D_RPCTRACE, "Catalog index %u already clear?\n", index);
GOTO(out_unlock, rc);
}
loghandle->lgh_hdr->llh_count--;
subtract_count = true;
/* Pass this index to llog_osd_write_rec(), which will use the index
* to only update the necesary bitmap. */
lgi->lgi_cookie.lgc_index = index;
/* update header */
rc = llog_write_rec(env, loghandle, &llh->llh_hdr, &lgi->lgi_cookie,
LLOG_HEADER_IDX, th);
if (rc != 0)
GOTO(out_unlock, rc);
if ((llh->llh_flags & LLOG_F_ZAP_WHEN_EMPTY) &&
(llh->llh_count == 1) &&
((loghandle->lgh_last_idx == LLOG_HDR_BITMAP_SIZE(llh) - 1) ||
(loghandle->u.phd.phd_cat_handle != NULL &&
loghandle->u.phd.phd_cat_handle->u.chd.chd_current_log !=
loghandle))) {
/* never try to destroy it again */
llh->llh_flags &= ~LLOG_F_ZAP_WHEN_EMPTY;
rc = llog_trans_destroy(env, loghandle, th);
if (rc < 0) {
/* Sigh, can not destroy the final plain llog, but
* the bitmap has been clearly, so the record can not
* be accessed anymore, let's return 0 for now, and
* the orphan will be handled by LFSCK. */
CERROR("%s: can't destroy empty llog #"DOSTID
"#%08x: rc = %d\n",
loghandle->lgh_ctxt->loc_obd->obd_name,
POSTID(&loghandle->lgh_id.lgl_oi),
loghandle->lgh_id.lgl_ogen, rc);
GOTO(out_unlock, rc);
}
rc = LLOG_DEL_PLAIN;
}
out_unlock:
mutex_unlock(&loghandle->lgh_hdr_mutex);
up_write(&loghandle->lgh_lock);
out_trans:
rc1 = dt_trans_stop(env, dt, th);
if (rc == 0)
rc = rc1;
if (rc < 0 && subtract_count) {
mutex_lock(&loghandle->lgh_hdr_mutex);
loghandle->lgh_hdr->llh_count++;
ext2_set_bit(index, LLOG_HDR_BITMAP(llh));
mutex_unlock(&loghandle->lgh_hdr_mutex);
}
RETURN(rc);
}
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;
}
