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);
atomic_set(&loghandle->lgh_refcount, 1);
unsigned int buf_offset = 0;
bool partial_chunk;
int lh_last_idx;
+ int synced_idx = 0;
/* skip records not set in bitmap */
while (index <= last_index &&
/* get the buf with our target record; avoid old garbage */
memset(buf, 0, chunk_size);
/* the record index for outdated chunk data */
- lh_last_idx = loghandle->lgh_last_idx + 1;
+ /* 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, "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. */
- int records;
- /* lgh_last_idx could be less then index
- * for catalog, if catalog is wrapped */
- if ((index > loghandle->lgh_last_idx &&
- !(loghandle->lgh_hdr->llh_flags &
- LLOG_F_IS_CAT)) || repeated ||
- (loghandle->lgh_obj != NULL &&
- dt_object_remote(loghandle->lgh_obj)))
- GOTO(out, rc = 0);
- /* <2 records means no more records
- * if the last record we processed was
- * the final one, then the underlying
- * object might have been destroyed yet.
- * we better don't access that.. */
- mutex_lock(&loghandle->lgh_hdr_mutex);
- records = loghandle->lgh_hdr->llh_count;
- mutex_unlock(&loghandle->lgh_hdr_mutex);
- if (records <= 1)
- 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);
+ if (index == (synced_idx + 1) &&
+ synced_idx == LLOG_HDR_TAIL(llh)->lrt_index)
+ GOTO(out, rc = 0);
+
+ /* 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.
+ */
+
+ if ((index == lh_last_idx && synced_idx != index) ||
+ (index == (lh_last_idx + 1) &&
+ !(index == (llh->llh_cat_idx + 1) &&
+ (llh->llh_flags & LLOG_F_IS_CAT))) ||
+ (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;
loghandle->lgh_cur_offset = (char *)rec - (char *)buf +
chunk_offset;
- OBD_FAIL_TIMEOUT(OBD_FAIL_LLOG_PROCESS_TIMEOUT, 2);
-
+ if (OBD_FAIL_PRECHECK(OBD_FAIL_LLOG_PROCESS_TIMEOUT) &&
+ index == lh_last_idx &&
+ cfs_fail_val == (unsigned int)
+ (loghandle->lgh_id.lgl_oi.oi.oi_id &
+ 0xFFFFFFFF)) {
+ OBD_RACE(OBD_FAIL_LLOG_PROCESS_TIMEOUT);
+ }
/* if set, process the callback on this record */
if (ext2_test_bit(index, LLOG_HDR_BITMAP(llh))) {
struct llog_cookie *lgc;
__u64 tmp_off;
int tmp_idx;
- /* 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.
- * Checking the race with llog_add the bit is set
- * after incrementation of lgh_last_idx */
- if (index == lh_last_idx &&
- lh_last_idx !=
- (loghandle->lgh_last_idx + 1)) {
- /* save offset inside buffer for
- * the re-read */
- buf_offset = (char *)rec - (char *)buf;
- cur_offset = chunk_offset;
- repeated = true;
- goto repeat;
- }
+ CDEBUG(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 */
git://git.whamcloud.com / fs / lustre-release.git / blobdiff