示例#1
0
/* ARGSUSED */
int
zil_clear_log_chain(char *osname, void *txarg)
{
	zilog_t *zilog;
	zil_header_t *zh;
	objset_t *os;
	dmu_tx_t *tx;
	int error;

	error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os);
	if (error) {
		cmn_err(CE_WARN, "can't open objset for %s", osname);
		return (0);
	}

	zilog = dmu_objset_zil(os);
	tx = dmu_tx_create(zilog->zl_os);
	(void) dmu_tx_assign(tx, TXG_WAIT);
	zh = zil_header_in_syncing_context(zilog);
	BP_ZERO(&zh->zh_log);
	dsl_dataset_dirty(dmu_objset_ds(os), tx);
	dmu_tx_commit(tx);
	dmu_objset_close(os);
	return (0);
}
示例#2
0
int
zil_claim(char *osname, void *txarg)
{
	dmu_tx_t *tx = txarg;
	uint64_t first_txg = dmu_tx_get_txg(tx);
	zilog_t *zilog;
	zil_header_t *zh;
	objset_t *os;
	int error;

	error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os);
	if (error) {
		cmn_err(CE_WARN, "can't open objset for %s", osname);
		return (0);
	}

	zilog = dmu_objset_zil(os);
	zh = zil_header_in_syncing_context(zilog);

	/*
	 * Record here whether the zil has any records to replay.
	 * If the header block pointer is null or the block points
	 * to the stubby then we know there are no valid log records.
	 * We use the header to store this state as the the zilog gets
	 * freed later in dmu_objset_close().
	 * The flags (and the rest of the header fields) are cleared in
	 * zil_sync() as a result of a zil_destroy(), after replaying the log.
	 *
	 * Note, the intent log can be empty but still need the
	 * stubby to be claimed.
	 */
	if (!zil_empty(zilog))
		zh->zh_flags |= ZIL_REPLAY_NEEDED;

	/*
	 * Claim all log blocks if we haven't already done so, and remember
	 * the highest claimed sequence number.  This ensures that if we can
	 * read only part of the log now (e.g. due to a missing device),
	 * but we can read the entire log later, we will not try to replay
	 * or destroy beyond the last block we successfully claimed.
	 */
	ASSERT3U(zh->zh_claim_txg, <=, first_txg);
	if (zh->zh_claim_txg == 0 && !BP_IS_HOLE(&zh->zh_log)) {
		zh->zh_claim_txg = first_txg;
		zh->zh_claim_seq = zil_parse(zilog, zil_claim_log_block,
		    zil_claim_log_record, tx, first_txg);
		dsl_dataset_dirty(dmu_objset_ds(os), tx);
	}

	ASSERT3U(first_txg, ==, (spa_last_synced_txg(zilog->zl_spa) + 1));
	dmu_objset_close(os);
	return (0);
}
示例#3
0
文件: zil.c 项目: harshada/zfs
/* ARGSUSED */
int
zil_check_log_chain(char *osname, void *txarg)
{
	zilog_t *zilog;
	zil_header_t *zh;
	blkptr_t blk;
	arc_buf_t *abuf;
	objset_t *os;
	char *lrbuf;
	zil_trailer_t *ztp;
	int error;

	error = dmu_objset_open(osname, DMU_OST_ANY, DS_MODE_USER, &os);
	if (error) {
		cmn_err(CE_WARN, "can't open objset for %s", osname);
		return (0);
	}

	zilog = dmu_objset_zil(os);
	zh = zil_header_in_syncing_context(zilog);
	blk = zh->zh_log;
	if (BP_IS_HOLE(&blk)) {
		dmu_objset_close(os);
		return (0); /* no chain */
	}

	for (;;) {
		error = zil_read_log_block(zilog, &blk, &abuf);
		if (error)
			break;
		lrbuf = abuf->b_data;
		ztp = (zil_trailer_t *)(lrbuf + BP_GET_LSIZE(&blk)) - 1;
		blk = ztp->zit_next_blk;
		VERIFY(arc_buf_remove_ref(abuf, &abuf) == 1);
	}
	dmu_objset_close(os);
	if (error == ECKSUM)
		return (0); /* normal end of chain */
	return (error);
}
示例#4
0
文件: zil.c 项目: harshada/zfs
/*
 * Called in syncing context to free committed log blocks and update log header.
 */
void
zil_sync(zilog_t *zilog, dmu_tx_t *tx)
{
	zil_header_t *zh = zil_header_in_syncing_context(zilog);
	uint64_t txg = dmu_tx_get_txg(tx);
	spa_t *spa = zilog->zl_spa;
	lwb_t *lwb;

	/*
	 * We don't zero out zl_destroy_txg, so make sure we don't try
	 * to destroy it twice.
	 */
	if (spa_sync_pass(spa) != 1)
		return;

	mutex_enter(&zilog->zl_lock);

	ASSERT(zilog->zl_stop_sync == 0);

	zh->zh_replay_seq = zilog->zl_replayed_seq[txg & TXG_MASK];

	if (zilog->zl_destroy_txg == txg) {
		blkptr_t blk = zh->zh_log;

		ASSERT(list_head(&zilog->zl_lwb_list) == NULL);

		bzero(zh, sizeof (zil_header_t));
		bzero(zilog->zl_replayed_seq, sizeof (zilog->zl_replayed_seq));

		if (zilog->zl_keep_first) {
			/*
			 * If this block was part of log chain that couldn't
			 * be claimed because a device was missing during
			 * zil_claim(), but that device later returns,
			 * then this block could erroneously appear valid.
			 * To guard against this, assign a new GUID to the new
			 * log chain so it doesn't matter what blk points to.
			 */
			zil_init_log_chain(zilog, &blk);
			zh->zh_log = blk;
		}
	}

	while ((lwb = list_head(&zilog->zl_lwb_list)) != NULL) {
		zh->zh_log = lwb->lwb_blk;
		if (lwb->lwb_buf != NULL || lwb->lwb_max_txg > txg)
			break;
		list_remove(&zilog->zl_lwb_list, lwb);
		zio_free_blk(spa, &lwb->lwb_blk, txg);
		kmem_cache_free(zil_lwb_cache, lwb);

		/*
		 * If we don't have anything left in the lwb list then
		 * we've had an allocation failure and we need to zero
		 * out the zil_header blkptr so that we don't end
		 * up freeing the same block twice.
		 */
		if (list_head(&zilog->zl_lwb_list) == NULL)
			BP_ZERO(&zh->zh_log);
	}
	mutex_exit(&zilog->zl_lock);
}