*
* Called with j_list_lock held.
*/
-static inline void __buffer_unlink_first(struct journal_head *jh)
+static inline void __buffer_unlink(struct journal_head *jh)
{
transaction_t *transaction = jh->b_cp_transaction;
}
/*
- * Unlink a buffer from a transaction checkpoint(io) list.
- *
- * Called with j_list_lock held.
- */
-static inline void __buffer_unlink(struct journal_head *jh)
-{
- transaction_t *transaction = jh->b_cp_transaction;
-
- __buffer_unlink_first(jh);
- if (transaction->t_checkpoint_io_list == jh) {
- transaction->t_checkpoint_io_list = jh->b_cpnext;
- if (transaction->t_checkpoint_io_list == jh)
- transaction->t_checkpoint_io_list = NULL;
- }
-}
-
-/*
- * Move a buffer from the checkpoint list to the checkpoint io list
- *
- * Called with j_list_lock held
- */
-static inline void __buffer_relink_io(struct journal_head *jh)
-{
- transaction_t *transaction = jh->b_cp_transaction;
-
- __buffer_unlink_first(jh);
-
- if (!transaction->t_checkpoint_io_list) {
- jh->b_cpnext = jh->b_cpprev = jh;
- } else {
- jh->b_cpnext = transaction->t_checkpoint_io_list;
- jh->b_cpprev = transaction->t_checkpoint_io_list->b_cpprev;
- jh->b_cpprev->b_cpnext = jh;
- jh->b_cpnext->b_cpprev = jh;
- }
- transaction->t_checkpoint_io_list = jh;
-}
-
-/*
* Check a checkpoint buffer could be release or not.
*
* Requires j_list_lock
struct buffer_head *bh = journal->j_chkpt_bhs[i];
BUFFER_TRACE(bh, "brelse");
__brelse(bh);
+ journal->j_chkpt_bhs[i] = NULL;
}
*batch_count = 0;
}
jh = transaction->t_checkpoint_list;
bh = jh2bh(jh);
+ /*
+ * The buffer 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.
+ */
if (buffer_locked(bh)) {
get_bh(bh);
spin_unlock(&journal->j_list_lock);
}
if (!buffer_dirty(bh)) {
BUFFER_TRACE(bh, "remove from checkpoint");
- if (__jbd2_journal_remove_checkpoint(jh))
- /* The transaction was released; we're done */
+ /*
+ * 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;
- continue;
+ } else {
+ /*
+ * 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;
}
- /*
- * Important: we are about to write the buffer, and
- * possibly block, while still holding the journal
- * lock. We cannot afford to let the transaction
- * logic start messing around with this buffer before
- * we write it to disk, as that would break
- * recoverability.
- */
- BUFFER_TRACE(bh, "queue");
- get_bh(bh);
- J_ASSERT_BH(bh, !buffer_jwrite(bh));
- journal->j_chkpt_bhs[batch_count++] = bh;
- __buffer_relink_io(jh);
- transaction->t_chp_stats.cs_written++;
+
if ((batch_count == JBD2_NR_BATCH) ||
- need_resched() ||
- spin_needbreak(&journal->j_list_lock))
+ need_resched() || spin_needbreak(&journal->j_list_lock) ||
+ jh2bh(transaction->t_checkpoint_list) == journal->j_chkpt_bhs[0])
goto unlock_and_flush;
}
goto restart;
}
- /*
- * Now we issued all of the transaction's buffers, let's deal
- * with the buffers that are out for I/O.
- */
-restart2:
- /* Did somebody clean up the transaction in the meanwhile? */
- if (journal->j_checkpoint_transactions != transaction ||
- transaction->t_tid != this_tid)
- goto out;
-
- while (transaction->t_checkpoint_io_list) {
- jh = transaction->t_checkpoint_io_list;
- bh = jh2bh(jh);
- if (buffer_locked(bh)) {
- 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);
- spin_lock(&journal->j_list_lock);
- goto restart2;
- }
-
- /*
- * Now in whatever state the buffer currently is, we
- * know that it has been written out and so we can
- * drop it from the list
- */
- if (__jbd2_journal_remove_checkpoint(jh))
- break;
- }
out:
spin_unlock(&journal->j_list_lock);
result = jbd2_cleanup_journal_tail(journal);
break;
if (need_resched() || spin_needbreak(&journal->j_list_lock))
break;
- if (released)
- continue;
-
- nr_freed += journal_shrink_one_cp_list(transaction->t_checkpoint_io_list,
- nr_to_scan, &released);
- if (*nr_to_scan == 0)
- break;
- if (need_resched() || spin_needbreak(&journal->j_list_lock))
- break;
} while (transaction != last_transaction);
if (transaction != last_transaction) {
*/
if (need_resched())
return;
- if (ret)
- continue;
- /*
- * It is essential that we are as careful as in the case of
- * t_checkpoint_list with removing the buffer from the list as
- * we can possibly see not yet submitted buffers on io_list
- */
- ret = journal_clean_one_cp_list(transaction->
- t_checkpoint_io_list, destroy);
- if (need_resched())
- return;
/*
* Stop scanning if we couldn't free the transaction. This
* avoids pointless scanning of transactions which still
jbd2_journal_put_journal_head(jh);
/* Is this transaction empty? */
- if (transaction->t_checkpoint_list || transaction->t_checkpoint_io_list)
+ if (transaction->t_checkpoint_list)
return 0;
/*
J_ASSERT(transaction->t_forget == NULL);
J_ASSERT(transaction->t_shadow_list == NULL);
J_ASSERT(transaction->t_checkpoint_list == NULL);
- J_ASSERT(transaction->t_checkpoint_io_list == NULL);
J_ASSERT(atomic_read(&transaction->t_updates) == 0);
J_ASSERT(journal->j_committing_transaction != transaction);
J_ASSERT(journal->j_running_transaction != transaction);
projects / platform / kernel / linux-starfive.git / blobdiff