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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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79feb521a4
When we reach jbd2_cleanup_journal_tail(), there is no guarantee that checkpointed buffers are on a stable storage - especially if buffers were written out by jbd2_log_do_checkpoint(), they are likely to be only in disk's caches. Thus when we update journal superblock effectively removing old transaction from journal, this write of superblock can get to stable storage before those checkpointed buffers which can result in filesystem corruption after a crash. Thus we must unconditionally issue a cache flush before we update journal superblock in these cases. A similar problem can also occur if journal superblock is written only in disk's caches, other transaction starts reusing space of the transaction cleaned from the log and power failure happens. 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> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
262 lines
6.4 KiB
C
262 lines
6.4 KiB
C
#undef TRACE_SYSTEM
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#define TRACE_SYSTEM jbd2
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#if !defined(_TRACE_JBD2_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_JBD2_H
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#include <linux/jbd2.h>
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#include <linux/tracepoint.h>
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struct transaction_chp_stats_s;
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struct transaction_run_stats_s;
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TRACE_EVENT(jbd2_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), __entry->result)
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);
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DECLARE_EVENT_CLASS(jbd2_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( char, sync_commit )
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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->sync_commit = commit_transaction->t_synchronous_commit;
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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 sync %d",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->transaction, __entry->sync_commit)
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);
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DEFINE_EVENT(jbd2_commit, jbd2_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(jbd2_commit, jbd2_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(jbd2_commit, jbd2_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(jbd2_commit, jbd2_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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DEFINE_EVENT(jbd2_commit, jbd2_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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);
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TRACE_EVENT(jbd2_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( char, sync_commit )
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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->sync_commit = commit_transaction->t_synchronous_commit;
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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 sync %d head %d",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->transaction, __entry->sync_commit, __entry->head)
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);
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TRACE_EVENT(jbd2_submit_inode_data,
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TP_PROTO(struct inode *inode),
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TP_ARGS(inode),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( ino_t, ino )
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),
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TP_fast_assign(
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__entry->dev = inode->i_sb->s_dev;
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__entry->ino = inode->i_ino;
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),
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TP_printk("dev %d,%d ino %lu",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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(unsigned long) __entry->ino)
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);
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TRACE_EVENT(jbd2_run_stats,
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TP_PROTO(dev_t dev, unsigned long tid,
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struct transaction_run_stats_s *stats),
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TP_ARGS(dev, tid, stats),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( unsigned long, tid )
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__field( unsigned long, wait )
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__field( unsigned long, running )
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__field( unsigned long, locked )
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__field( unsigned long, flushing )
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__field( unsigned long, logging )
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__field( __u32, handle_count )
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__field( __u32, blocks )
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__field( __u32, blocks_logged )
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),
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TP_fast_assign(
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__entry->dev = dev;
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__entry->tid = tid;
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__entry->wait = stats->rs_wait;
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__entry->running = stats->rs_running;
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__entry->locked = stats->rs_locked;
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__entry->flushing = stats->rs_flushing;
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__entry->logging = stats->rs_logging;
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__entry->handle_count = stats->rs_handle_count;
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__entry->blocks = stats->rs_blocks;
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__entry->blocks_logged = stats->rs_blocks_logged;
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),
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TP_printk("dev %d,%d tid %lu wait %u running %u locked %u flushing %u "
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"logging %u handle_count %u blocks %u blocks_logged %u",
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MAJOR(__entry->dev), MINOR(__entry->dev), __entry->tid,
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jiffies_to_msecs(__entry->wait),
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jiffies_to_msecs(__entry->running),
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jiffies_to_msecs(__entry->locked),
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jiffies_to_msecs(__entry->flushing),
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jiffies_to_msecs(__entry->logging),
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__entry->handle_count, __entry->blocks,
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__entry->blocks_logged)
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);
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TRACE_EVENT(jbd2_checkpoint_stats,
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TP_PROTO(dev_t dev, unsigned long tid,
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struct transaction_chp_stats_s *stats),
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TP_ARGS(dev, tid, stats),
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TP_STRUCT__entry(
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__field( dev_t, dev )
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__field( unsigned long, tid )
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__field( unsigned long, chp_time )
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__field( __u32, forced_to_close )
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__field( __u32, written )
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__field( __u32, dropped )
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),
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TP_fast_assign(
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__entry->dev = dev;
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__entry->tid = tid;
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__entry->chp_time = stats->cs_chp_time;
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__entry->forced_to_close= stats->cs_forced_to_close;
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__entry->written = stats->cs_written;
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__entry->dropped = stats->cs_dropped;
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),
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TP_printk("dev %d,%d tid %lu chp_time %u forced_to_close %u "
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"written %u dropped %u",
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MAJOR(__entry->dev), MINOR(__entry->dev), __entry->tid,
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jiffies_to_msecs(__entry->chp_time),
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__entry->forced_to_close, __entry->written, __entry->dropped)
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);
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TRACE_EVENT(jbd2_update_log_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(jbd2_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_JBD2_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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