fd2cbd4dfa
If journal superblock is written only in disk's caches and other transaction starts reusing space of the transaction cleaned from the log, it can happen blocks of a new transaction reach the disk before journal superblock. When power failure happens in such case, subsequent journal replay would still try to replay the old transaction but some of it's blocks may be already overwritten by the new transaction. For this reason we must use WRITE_FUA when updating log tail and we must first write new log tail to disk and update in-memory information only after that. Signed-off-by: Jan Kara <jack@suse.cz>
195 lines
4.3 KiB
C
195 lines
4.3 KiB
C
#undef TRACE_SYSTEM
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#define TRACE_SYSTEM jbd
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#if !defined(_TRACE_JBD_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_JBD_H
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#include <linux/jbd.h>
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#include <linux/tracepoint.h>
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TRACE_EVENT(jbd_checkpoint,
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TP_PROTO(journal_t *journal, int result),
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TP_ARGS(journal, result),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( int, result )
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),
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TP_fast_assign(
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__entry->dev = journal->j_fs_dev->bd_dev;
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__entry->result = result;
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),
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TP_printk("dev %d,%d result %d",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->result)
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);
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DECLARE_EVENT_CLASS(jbd_commit,
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TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
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TP_ARGS(journal, commit_transaction),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( int, transaction )
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),
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TP_fast_assign(
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__entry->dev = journal->j_fs_dev->bd_dev;
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__entry->transaction = commit_transaction->t_tid;
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),
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TP_printk("dev %d,%d transaction %d",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->transaction)
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);
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DEFINE_EVENT(jbd_commit, jbd_start_commit,
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TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
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TP_ARGS(journal, commit_transaction)
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);
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DEFINE_EVENT(jbd_commit, jbd_commit_locking,
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TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
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TP_ARGS(journal, commit_transaction)
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);
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DEFINE_EVENT(jbd_commit, jbd_commit_flushing,
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TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
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TP_ARGS(journal, commit_transaction)
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);
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DEFINE_EVENT(jbd_commit, jbd_commit_logging,
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TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
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TP_ARGS(journal, commit_transaction)
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);
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TRACE_EVENT(jbd_drop_transaction,
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TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
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TP_ARGS(journal, commit_transaction),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( int, transaction )
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),
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TP_fast_assign(
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__entry->dev = journal->j_fs_dev->bd_dev;
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__entry->transaction = commit_transaction->t_tid;
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),
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TP_printk("dev %d,%d transaction %d",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->transaction)
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);
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TRACE_EVENT(jbd_end_commit,
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TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
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TP_ARGS(journal, commit_transaction),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( int, transaction )
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__field( int, head )
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),
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TP_fast_assign(
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__entry->dev = journal->j_fs_dev->bd_dev;
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__entry->transaction = commit_transaction->t_tid;
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__entry->head = journal->j_tail_sequence;
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),
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TP_printk("dev %d,%d transaction %d head %d",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->transaction, __entry->head)
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);
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TRACE_EVENT(jbd_do_submit_data,
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TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
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TP_ARGS(journal, commit_transaction),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( int, transaction )
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),
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TP_fast_assign(
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__entry->dev = journal->j_fs_dev->bd_dev;
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__entry->transaction = commit_transaction->t_tid;
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),
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TP_printk("dev %d,%d transaction %d",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->transaction)
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);
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TRACE_EVENT(jbd_cleanup_journal_tail,
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TP_PROTO(journal_t *journal, tid_t first_tid,
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unsigned long block_nr, unsigned long freed),
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TP_ARGS(journal, first_tid, block_nr, freed),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( tid_t, tail_sequence )
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__field( tid_t, first_tid )
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__field(unsigned long, block_nr )
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__field(unsigned long, freed )
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),
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TP_fast_assign(
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__entry->dev = journal->j_fs_dev->bd_dev;
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__entry->tail_sequence = journal->j_tail_sequence;
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__entry->first_tid = first_tid;
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__entry->block_nr = block_nr;
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__entry->freed = freed;
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),
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TP_printk("dev %d,%d from %u to %u offset %lu freed %lu",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->tail_sequence, __entry->first_tid,
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__entry->block_nr, __entry->freed)
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);
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TRACE_EVENT(journal_write_superblock,
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TP_PROTO(journal_t *journal, int write_op),
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TP_ARGS(journal, write_op),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( int, write_op )
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),
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TP_fast_assign(
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__entry->dev = journal->j_fs_dev->bd_dev;
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__entry->write_op = write_op;
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),
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TP_printk("dev %d,%d write_op %x", MAJOR(__entry->dev),
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MINOR(__entry->dev), __entry->write_op)
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);
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#endif /* _TRACE_JBD_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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