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-rw-r--r--fs/jbd2/checkpoint.c729
1 files changed, 729 insertions, 0 deletions
diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
new file mode 100644
index 000000000..f033ac807
--- /dev/null
+++ b/fs/jbd2/checkpoint.c
@@ -0,0 +1,729 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * linux/fs/jbd2/checkpoint.c
+ *
+ * Written by Stephen C. Tweedie <sct@redhat.com>, 1999
+ *
+ * Copyright 1999 Red Hat Software --- All Rights Reserved
+ *
+ * Checkpoint routines for the generic filesystem journaling code.
+ * Part of the ext2fs journaling system.
+ *
+ * Checkpointing is the process of ensuring that a section of the log is
+ * committed fully to disk, so that that portion of the log can be
+ * reused.
+ */
+
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/jbd2.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/blkdev.h>
+#include <trace/events/jbd2.h>
+
+/*
+ * Unlink a buffer from a transaction checkpoint list.
+ *
+ * Called with j_list_lock held.
+ */
+static inline void __buffer_unlink(struct journal_head *jh)
+{
+ transaction_t *transaction = jh->b_cp_transaction;
+
+ jh->b_cpnext->b_cpprev = jh->b_cpprev;
+ jh->b_cpprev->b_cpnext = jh->b_cpnext;
+ if (transaction->t_checkpoint_list == jh) {
+ transaction->t_checkpoint_list = jh->b_cpnext;
+ if (transaction->t_checkpoint_list == jh)
+ transaction->t_checkpoint_list = NULL;
+ }
+}
+
+/*
+ * Check a checkpoint buffer could be release or not.
+ *
+ * Requires j_list_lock
+ */
+static inline bool __cp_buffer_busy(struct journal_head *jh)
+{
+ struct buffer_head *bh = jh2bh(jh);
+
+ return (jh->b_transaction || buffer_locked(bh) || buffer_dirty(bh));
+}
+
+/*
+ * __jbd2_log_wait_for_space: wait until there is space in the journal.
+ *
+ * Called under j-state_lock *only*. It will be unlocked if we have to wait
+ * for a checkpoint to free up some space in the log.
+ */
+void __jbd2_log_wait_for_space(journal_t *journal)
+__acquires(&journal->j_state_lock)
+__releases(&journal->j_state_lock)
+{
+ int nblocks, space_left;
+ /* assert_spin_locked(&journal->j_state_lock); */
+
+ nblocks = journal->j_max_transaction_buffers;
+ while (jbd2_log_space_left(journal) < nblocks) {
+ write_unlock(&journal->j_state_lock);
+ mutex_lock_io(&journal->j_checkpoint_mutex);
+
+ /*
+ * Test again, another process may have checkpointed while we
+ * were waiting for the checkpoint lock. If there are no
+ * transactions ready to be checkpointed, try to recover
+ * journal space by calling cleanup_journal_tail(), and if
+ * that doesn't work, by waiting for the currently committing
+ * transaction to complete. If there is absolutely no way
+ * to make progress, this is either a BUG or corrupted
+ * filesystem, so abort the journal and leave a stack
+ * trace for forensic evidence.
+ */
+ write_lock(&journal->j_state_lock);
+ if (journal->j_flags & JBD2_ABORT) {
+ mutex_unlock(&journal->j_checkpoint_mutex);
+ return;
+ }
+ spin_lock(&journal->j_list_lock);
+ space_left = jbd2_log_space_left(journal);
+ if (space_left < nblocks) {
+ int chkpt = journal->j_checkpoint_transactions != NULL;
+ tid_t tid = 0;
+
+ if (journal->j_committing_transaction)
+ tid = journal->j_committing_transaction->t_tid;
+ spin_unlock(&journal->j_list_lock);
+ write_unlock(&journal->j_state_lock);
+ if (chkpt) {
+ jbd2_log_do_checkpoint(journal);
+ } else if (jbd2_cleanup_journal_tail(journal) == 0) {
+ /* We were able to recover space; yay! */
+ ;
+ } else if (tid) {
+ /*
+ * jbd2_journal_commit_transaction() may want
+ * to take the checkpoint_mutex if JBD2_FLUSHED
+ * is set. So we need to temporarily drop it.
+ */
+ mutex_unlock(&journal->j_checkpoint_mutex);
+ jbd2_log_wait_commit(journal, tid);
+ write_lock(&journal->j_state_lock);
+ continue;
+ } else {
+ printk(KERN_ERR "%s: needed %d blocks and "
+ "only had %d space available\n",
+ __func__, nblocks, space_left);
+ printk(KERN_ERR "%s: no way to get more "
+ "journal space in %s\n", __func__,
+ journal->j_devname);
+ WARN_ON(1);
+ jbd2_journal_abort(journal, -EIO);
+ }
+ write_lock(&journal->j_state_lock);
+ } else {
+ spin_unlock(&journal->j_list_lock);
+ }
+ mutex_unlock(&journal->j_checkpoint_mutex);
+ }
+}
+
+static void
+__flush_batch(journal_t *journal, int *batch_count)
+{
+ int i;
+ struct blk_plug plug;
+
+ blk_start_plug(&plug);
+ for (i = 0; i < *batch_count; i++)
+ write_dirty_buffer(journal->j_chkpt_bhs[i], REQ_SYNC);
+ blk_finish_plug(&plug);
+
+ for (i = 0; i < *batch_count; i++) {
+ struct buffer_head *bh = journal->j_chkpt_bhs[i];
+ BUFFER_TRACE(bh, "brelse");
+ __brelse(bh);
+ journal->j_chkpt_bhs[i] = NULL;
+ }
+ *batch_count = 0;
+}
+
+/*
+ * Perform an actual checkpoint. We take the first transaction on the
+ * list of transactions to be checkpointed and send all its buffers
+ * to disk. We submit larger chunks of data at once.
+ *
+ * The journal should be locked before calling this function.
+ * Called with j_checkpoint_mutex held.
+ */
+int jbd2_log_do_checkpoint(journal_t *journal)
+{
+ struct journal_head *jh;
+ struct buffer_head *bh;
+ transaction_t *transaction;
+ tid_t this_tid;
+ int result, batch_count = 0;
+
+ jbd2_debug(1, "Start checkpoint\n");
+
+ /*
+ * First thing: if there are any transactions in the log which
+ * don't need checkpointing, just eliminate them from the
+ * journal straight away.
+ */
+ result = jbd2_cleanup_journal_tail(journal);
+ trace_jbd2_checkpoint(journal, result);
+ jbd2_debug(1, "cleanup_journal_tail returned %d\n", result);
+ if (result <= 0)
+ return result;
+
+ /*
+ * OK, we need to start writing disk blocks. Take one transaction
+ * and write it.
+ */
+ spin_lock(&journal->j_list_lock);
+ if (!journal->j_checkpoint_transactions)
+ goto out;
+ transaction = journal->j_checkpoint_transactions;
+ if (transaction->t_chp_stats.cs_chp_time == 0)
+ transaction->t_chp_stats.cs_chp_time = jiffies;
+ this_tid = transaction->t_tid;
+restart:
+ /*
+ * If someone cleaned up this transaction while we slept, we're
+ * done (maybe it's a new transaction, but it fell at the same
+ * address).
+ */
+ if (journal->j_checkpoint_transactions != transaction ||
+ transaction->t_tid != this_tid)
+ goto out;
+
+ /* checkpoint all of the transaction's buffers */
+ while (transaction->t_checkpoint_list) {
+ jh = transaction->t_checkpoint_list;
+ bh = jh2bh(jh);
+
+ if (jh->b_transaction != NULL) {
+ transaction_t *t = jh->b_transaction;
+ tid_t tid = t->t_tid;
+
+ transaction->t_chp_stats.cs_forced_to_close++;
+ spin_unlock(&journal->j_list_lock);
+ if (unlikely(journal->j_flags & JBD2_UNMOUNT))
+ /*
+ * The journal thread is dead; so
+ * starting and waiting for a commit
+ * to finish will cause us to wait for
+ * a _very_ long time.
+ */
+ printk(KERN_ERR
+ "JBD2: %s: Waiting for Godot: block %llu\n",
+ journal->j_devname, (unsigned long long) bh->b_blocknr);
+
+ if (batch_count)
+ __flush_batch(journal, &batch_count);
+ jbd2_log_start_commit(journal, tid);
+ /*
+ * jbd2_journal_commit_transaction() may want
+ * to take the checkpoint_mutex if JBD2_FLUSHED
+ * is set, jbd2_update_log_tail() called by
+ * jbd2_journal_commit_transaction() may also take
+ * checkpoint_mutex. So we need to temporarily
+ * drop it.
+ */
+ mutex_unlock(&journal->j_checkpoint_mutex);
+ jbd2_log_wait_commit(journal, tid);
+ mutex_lock_io(&journal->j_checkpoint_mutex);
+ spin_lock(&journal->j_list_lock);
+ goto restart;
+ }
+ if (!trylock_buffer(bh)) {
+ /*
+ * The buffer is locked, it may be writing back, or
+ * flushing out in the last couple of cycles, or
+ * re-adding into a new transaction, need to check
+ * it again until it's unlocked.
+ */
+ get_bh(bh);
+ spin_unlock(&journal->j_list_lock);
+ wait_on_buffer(bh);
+ /* the journal_head may have gone by now */
+ BUFFER_TRACE(bh, "brelse");
+ __brelse(bh);
+ goto retry;
+ } else if (!buffer_dirty(bh)) {
+ unlock_buffer(bh);
+ BUFFER_TRACE(bh, "remove from checkpoint");
+ /*
+ * If the transaction was released or the checkpoint
+ * list was empty, we're done.
+ */
+ if (__jbd2_journal_remove_checkpoint(jh) ||
+ !transaction->t_checkpoint_list)
+ goto out;
+ } else {
+ unlock_buffer(bh);
+ /*
+ * We are about to write the buffer, it could be
+ * raced by some other transaction shrink or buffer
+ * re-log logic once we release the j_list_lock,
+ * leave it on the checkpoint list and check status
+ * again to make sure it's clean.
+ */
+ BUFFER_TRACE(bh, "queue");
+ get_bh(bh);
+ J_ASSERT_BH(bh, !buffer_jwrite(bh));
+ journal->j_chkpt_bhs[batch_count++] = bh;
+ transaction->t_chp_stats.cs_written++;
+ transaction->t_checkpoint_list = jh->b_cpnext;
+ }
+
+ if ((batch_count == JBD2_NR_BATCH) ||
+ need_resched() || spin_needbreak(&journal->j_list_lock) ||
+ jh2bh(transaction->t_checkpoint_list) == journal->j_chkpt_bhs[0])
+ goto unlock_and_flush;
+ }
+
+ if (batch_count) {
+ unlock_and_flush:
+ spin_unlock(&journal->j_list_lock);
+ retry:
+ if (batch_count)
+ __flush_batch(journal, &batch_count);
+ spin_lock(&journal->j_list_lock);
+ goto restart;
+ }
+
+out:
+ spin_unlock(&journal->j_list_lock);
+ result = jbd2_cleanup_journal_tail(journal);
+
+ return (result < 0) ? result : 0;
+}
+
+/*
+ * Check the list of checkpoint transactions for the journal to see if
+ * we have already got rid of any since the last update of the log tail
+ * in the journal superblock. If so, we can instantly roll the
+ * superblock forward to remove those transactions from the log.
+ *
+ * Return <0 on error, 0 on success, 1 if there was nothing to clean up.
+ *
+ * Called with the journal lock held.
+ *
+ * This is the only part of the journaling code which really needs to be
+ * aware of transaction aborts. Checkpointing involves writing to the
+ * main filesystem area rather than to the journal, so it can proceed
+ * even in abort state, but we must not update the super block if
+ * checkpointing may have failed. Otherwise, we would lose some metadata
+ * buffers which should be written-back to the filesystem.
+ */
+
+int jbd2_cleanup_journal_tail(journal_t *journal)
+{
+ tid_t first_tid;
+ unsigned long blocknr;
+
+ if (is_journal_aborted(journal))
+ return -EIO;
+
+ if (!jbd2_journal_get_log_tail(journal, &first_tid, &blocknr))
+ return 1;
+ J_ASSERT(blocknr != 0);
+
+ /*
+ * We need to make sure that any blocks that were recently written out
+ * --- perhaps by jbd2_log_do_checkpoint() --- are flushed out before
+ * we drop the transactions from the journal. It's unlikely this will
+ * be necessary, especially with an appropriately sized journal, but we
+ * need this to guarantee correctness. Fortunately
+ * jbd2_cleanup_journal_tail() doesn't get called all that often.
+ */
+ if (journal->j_flags & JBD2_BARRIER)
+ blkdev_issue_flush(journal->j_fs_dev);
+
+ return __jbd2_update_log_tail(journal, first_tid, blocknr);
+}
+
+
+/* Checkpoint list management */
+
+enum shrink_type {SHRINK_DESTROY, SHRINK_BUSY_STOP, SHRINK_BUSY_SKIP};
+
+/*
+ * journal_shrink_one_cp_list
+ *
+ * Find all the written-back checkpoint buffers in the given list
+ * and try to release them. If the whole transaction is released, set
+ * the 'released' parameter. Return the number of released checkpointed
+ * buffers.
+ *
+ * Called with j_list_lock held.
+ */
+static unsigned long journal_shrink_one_cp_list(struct journal_head *jh,
+ enum shrink_type type,
+ bool *released)
+{
+ struct journal_head *last_jh;
+ struct journal_head *next_jh = jh;
+ unsigned long nr_freed = 0;
+ int ret;
+
+ *released = false;
+ if (!jh)
+ return 0;
+
+ last_jh = jh->b_cpprev;
+ do {
+ jh = next_jh;
+ next_jh = jh->b_cpnext;
+
+ if (type == SHRINK_DESTROY) {
+ ret = __jbd2_journal_remove_checkpoint(jh);
+ } else {
+ ret = jbd2_journal_try_remove_checkpoint(jh);
+ if (ret < 0) {
+ if (type == SHRINK_BUSY_SKIP)
+ continue;
+ break;
+ }
+ }
+
+ nr_freed++;
+ if (ret) {
+ *released = true;
+ break;
+ }
+
+ if (need_resched())
+ break;
+ } while (jh != last_jh);
+
+ return nr_freed;
+}
+
+/*
+ * jbd2_journal_shrink_checkpoint_list
+ *
+ * Find 'nr_to_scan' written-back checkpoint buffers in the journal
+ * and try to release them. Return the number of released checkpointed
+ * buffers.
+ *
+ * Called with j_list_lock held.
+ */
+unsigned long jbd2_journal_shrink_checkpoint_list(journal_t *journal,
+ unsigned long *nr_to_scan)
+{
+ transaction_t *transaction, *last_transaction, *next_transaction;
+ bool __maybe_unused released;
+ tid_t first_tid = 0, last_tid = 0, next_tid = 0;
+ tid_t tid = 0;
+ unsigned long nr_freed = 0;
+ unsigned long freed;
+
+again:
+ spin_lock(&journal->j_list_lock);
+ if (!journal->j_checkpoint_transactions) {
+ spin_unlock(&journal->j_list_lock);
+ goto out;
+ }
+
+ /*
+ * Get next shrink transaction, resume previous scan or start
+ * over again. If some others do checkpoint and drop transaction
+ * from the checkpoint list, we ignore saved j_shrink_transaction
+ * and start over unconditionally.
+ */
+ if (journal->j_shrink_transaction)
+ transaction = journal->j_shrink_transaction;
+ else
+ transaction = journal->j_checkpoint_transactions;
+
+ if (!first_tid)
+ first_tid = transaction->t_tid;
+ last_transaction = journal->j_checkpoint_transactions->t_cpprev;
+ next_transaction = transaction;
+ last_tid = last_transaction->t_tid;
+ do {
+ transaction = next_transaction;
+ next_transaction = transaction->t_cpnext;
+ tid = transaction->t_tid;
+
+ freed = journal_shrink_one_cp_list(transaction->t_checkpoint_list,
+ SHRINK_BUSY_SKIP, &released);
+ nr_freed += freed;
+ (*nr_to_scan) -= min(*nr_to_scan, freed);
+ if (*nr_to_scan == 0)
+ break;
+ if (need_resched() || spin_needbreak(&journal->j_list_lock))
+ break;
+ } while (transaction != last_transaction);
+
+ if (transaction != last_transaction) {
+ journal->j_shrink_transaction = next_transaction;
+ next_tid = next_transaction->t_tid;
+ } else {
+ journal->j_shrink_transaction = NULL;
+ next_tid = 0;
+ }
+
+ spin_unlock(&journal->j_list_lock);
+ cond_resched();
+
+ if (*nr_to_scan && next_tid)
+ goto again;
+out:
+ trace_jbd2_shrink_checkpoint_list(journal, first_tid, tid, last_tid,
+ nr_freed, next_tid);
+
+ return nr_freed;
+}
+
+/*
+ * journal_clean_checkpoint_list
+ *
+ * Find all the written-back checkpoint buffers in the journal and release them.
+ * If 'destroy' is set, release all buffers unconditionally.
+ *
+ * Called with j_list_lock held.
+ */
+void __jbd2_journal_clean_checkpoint_list(journal_t *journal, bool destroy)
+{
+ transaction_t *transaction, *last_transaction, *next_transaction;
+ enum shrink_type type;
+ bool released;
+
+ transaction = journal->j_checkpoint_transactions;
+ if (!transaction)
+ return;
+
+ type = destroy ? SHRINK_DESTROY : SHRINK_BUSY_STOP;
+ last_transaction = transaction->t_cpprev;
+ next_transaction = transaction;
+ do {
+ transaction = next_transaction;
+ next_transaction = transaction->t_cpnext;
+ journal_shrink_one_cp_list(transaction->t_checkpoint_list,
+ type, &released);
+ /*
+ * This function only frees up some memory if possible so we
+ * dont have an obligation to finish processing. Bail out if
+ * preemption requested:
+ */
+ if (need_resched())
+ return;
+ /*
+ * Stop scanning if we couldn't free the transaction. This
+ * avoids pointless scanning of transactions which still
+ * weren't checkpointed.
+ */
+ if (!released)
+ return;
+ } while (transaction != last_transaction);
+}
+
+/*
+ * Remove buffers from all checkpoint lists as journal is aborted and we just
+ * need to free memory
+ */
+void jbd2_journal_destroy_checkpoint(journal_t *journal)
+{
+ /*
+ * We loop because __jbd2_journal_clean_checkpoint_list() may abort
+ * early due to a need of rescheduling.
+ */
+ while (1) {
+ spin_lock(&journal->j_list_lock);
+ if (!journal->j_checkpoint_transactions) {
+ spin_unlock(&journal->j_list_lock);
+ break;
+ }
+ __jbd2_journal_clean_checkpoint_list(journal, true);
+ spin_unlock(&journal->j_list_lock);
+ cond_resched();
+ }
+}
+
+/*
+ * journal_remove_checkpoint: called after a buffer has been committed
+ * to disk (either by being write-back flushed to disk, or being
+ * committed to the log).
+ *
+ * We cannot safely clean a transaction out of the log until all of the
+ * buffer updates committed in that transaction have safely been stored
+ * elsewhere on disk. To achieve this, all of the buffers in a
+ * transaction need to be maintained on the transaction's checkpoint
+ * lists until they have been rewritten, at which point this function is
+ * called to remove the buffer from the existing transaction's
+ * checkpoint lists.
+ *
+ * The function returns 1 if it frees the transaction, 0 otherwise.
+ * The function can free jh and bh.
+ *
+ * This function is called with j_list_lock held.
+ */
+int __jbd2_journal_remove_checkpoint(struct journal_head *jh)
+{
+ struct transaction_chp_stats_s *stats;
+ transaction_t *transaction;
+ journal_t *journal;
+ struct buffer_head *bh = jh2bh(jh);
+
+ JBUFFER_TRACE(jh, "entry");
+
+ transaction = jh->b_cp_transaction;
+ if (!transaction) {
+ JBUFFER_TRACE(jh, "not on transaction");
+ return 0;
+ }
+ journal = transaction->t_journal;
+
+ JBUFFER_TRACE(jh, "removing from transaction");
+
+ /*
+ * If we have failed to write the buffer out to disk, the filesystem
+ * may become inconsistent. We cannot abort the journal here since
+ * we hold j_list_lock and we have to be careful about races with
+ * jbd2_journal_destroy(). So mark the writeback IO error in the
+ * journal here and we abort the journal later from a better context.
+ */
+ if (buffer_write_io_error(bh))
+ set_bit(JBD2_CHECKPOINT_IO_ERROR, &journal->j_atomic_flags);
+
+ __buffer_unlink(jh);
+ jh->b_cp_transaction = NULL;
+ percpu_counter_dec(&journal->j_checkpoint_jh_count);
+ jbd2_journal_put_journal_head(jh);
+
+ /* Is this transaction empty? */
+ if (transaction->t_checkpoint_list)
+ return 0;
+
+ /*
+ * There is one special case to worry about: if we have just pulled the
+ * buffer off a running or committing transaction's checkpoing list,
+ * then even if the checkpoint list is empty, the transaction obviously
+ * cannot be dropped!
+ *
+ * The locking here around t_state is a bit sleazy.
+ * See the comment at the end of jbd2_journal_commit_transaction().
+ */
+ if (transaction->t_state != T_FINISHED)
+ return 0;
+
+ /*
+ * OK, that was the last buffer for the transaction, we can now
+ * safely remove this transaction from the log.
+ */
+ stats = &transaction->t_chp_stats;
+ if (stats->cs_chp_time)
+ stats->cs_chp_time = jbd2_time_diff(stats->cs_chp_time,
+ jiffies);
+ trace_jbd2_checkpoint_stats(journal->j_fs_dev->bd_dev,
+ transaction->t_tid, stats);
+
+ __jbd2_journal_drop_transaction(journal, transaction);
+ jbd2_journal_free_transaction(transaction);
+ return 1;
+}
+
+/*
+ * Check the checkpoint buffer and try to remove it from the checkpoint
+ * list if it's clean. Returns -EBUSY if it is not clean, returns 1 if
+ * it frees the transaction, 0 otherwise.
+ *
+ * This function is called with j_list_lock held.
+ */
+int jbd2_journal_try_remove_checkpoint(struct journal_head *jh)
+{
+ struct buffer_head *bh = jh2bh(jh);
+
+ if (jh->b_transaction)
+ return -EBUSY;
+ if (!trylock_buffer(bh))
+ return -EBUSY;
+ if (buffer_dirty(bh)) {
+ unlock_buffer(bh);
+ return -EBUSY;
+ }
+ unlock_buffer(bh);
+
+ /*
+ * Buffer is clean and the IO has finished (we held the buffer
+ * lock) so the checkpoint is done. We can safely remove the
+ * buffer from this transaction.
+ */
+ JBUFFER_TRACE(jh, "remove from checkpoint list");
+ return __jbd2_journal_remove_checkpoint(jh);
+}
+
+/*
+ * journal_insert_checkpoint: put a committed buffer onto a checkpoint
+ * list so that we know when it is safe to clean the transaction out of
+ * the log.
+ *
+ * Called with the journal locked.
+ * Called with j_list_lock held.
+ */
+void __jbd2_journal_insert_checkpoint(struct journal_head *jh,
+ transaction_t *transaction)
+{
+ JBUFFER_TRACE(jh, "entry");
+ J_ASSERT_JH(jh, buffer_dirty(jh2bh(jh)) || buffer_jbddirty(jh2bh(jh)));
+ J_ASSERT_JH(jh, jh->b_cp_transaction == NULL);
+
+ /* Get reference for checkpointing transaction */
+ jbd2_journal_grab_journal_head(jh2bh(jh));
+ jh->b_cp_transaction = transaction;
+
+ if (!transaction->t_checkpoint_list) {
+ jh->b_cpnext = jh->b_cpprev = jh;
+ } else {
+ jh->b_cpnext = transaction->t_checkpoint_list;
+ jh->b_cpprev = transaction->t_checkpoint_list->b_cpprev;
+ jh->b_cpprev->b_cpnext = jh;
+ jh->b_cpnext->b_cpprev = jh;
+ }
+ transaction->t_checkpoint_list = jh;
+ percpu_counter_inc(&transaction->t_journal->j_checkpoint_jh_count);
+}
+
+/*
+ * We've finished with this transaction structure: adios...
+ *
+ * The transaction must have no links except for the checkpoint by this
+ * point.
+ *
+ * Called with the journal locked.
+ * Called with j_list_lock held.
+ */
+
+void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transaction)
+{
+ assert_spin_locked(&journal->j_list_lock);
+
+ journal->j_shrink_transaction = NULL;
+ if (transaction->t_cpnext) {
+ transaction->t_cpnext->t_cpprev = transaction->t_cpprev;
+ transaction->t_cpprev->t_cpnext = transaction->t_cpnext;
+ if (journal->j_checkpoint_transactions == transaction)
+ journal->j_checkpoint_transactions =
+ transaction->t_cpnext;
+ if (journal->j_checkpoint_transactions == transaction)
+ journal->j_checkpoint_transactions = NULL;
+ }
+
+ J_ASSERT(transaction->t_state == T_FINISHED);
+ J_ASSERT(transaction->t_buffers == NULL);
+ J_ASSERT(transaction->t_forget == NULL);
+ J_ASSERT(transaction->t_shadow_list == NULL);
+ J_ASSERT(transaction->t_checkpoint_list == NULL);
+ J_ASSERT(atomic_read(&transaction->t_updates) == 0);
+ J_ASSERT(journal->j_committing_transaction != transaction);
+ J_ASSERT(journal->j_running_transaction != transaction);
+
+ trace_jbd2_drop_transaction(journal, transaction);
+
+ jbd2_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid);
+}