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-rw-r--r--fs/jbd/transaction.c48
1 files changed, 0 insertions, 48 deletions
diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c
index ed886e6db399..73242ba7c7b1 100644
--- a/fs/jbd/transaction.c
+++ b/fs/jbd/transaction.c
@@ -1686,35 +1686,6 @@ out:
1686 return; 1686 return;
1687} 1687}
1688 1688
1689/*
1690 * journal_try_to_free_buffers() could race with journal_commit_transaction()
1691 * The latter might still hold the a count on buffers when inspecting
1692 * them on t_syncdata_list or t_locked_list.
1693 *
1694 * journal_try_to_free_buffers() will call this function to
1695 * wait for the current transaction to finish syncing data buffers, before
1696 * tryinf to free that buffer.
1697 *
1698 * Called with journal->j_state_lock held.
1699 */
1700static void journal_wait_for_transaction_sync_data(journal_t *journal)
1701{
1702 transaction_t *transaction = NULL;
1703 tid_t tid;
1704
1705 spin_lock(&journal->j_state_lock);
1706 transaction = journal->j_committing_transaction;
1707
1708 if (!transaction) {
1709 spin_unlock(&journal->j_state_lock);
1710 return;
1711 }
1712
1713 tid = transaction->t_tid;
1714 spin_unlock(&journal->j_state_lock);
1715 log_wait_commit(journal, tid);
1716}
1717
1718/** 1689/**
1719 * int journal_try_to_free_buffers() - try to free page buffers. 1690 * int journal_try_to_free_buffers() - try to free page buffers.
1720 * @journal: journal for operation 1691 * @journal: journal for operation
@@ -1786,25 +1757,6 @@ int journal_try_to_free_buffers(journal_t *journal,
1786 1757
1787 ret = try_to_free_buffers(page); 1758 ret = try_to_free_buffers(page);
1788 1759
1789 /*
1790 * There are a number of places where journal_try_to_free_buffers()
1791 * could race with journal_commit_transaction(), the later still
1792 * holds the reference to the buffers to free while processing them.
1793 * try_to_free_buffers() failed to free those buffers. Some of the
1794 * caller of releasepage() request page buffers to be dropped, otherwise
1795 * treat the fail-to-free as errors (such as generic_file_direct_IO())
1796 *
1797 * So, if the caller of try_to_release_page() wants the synchronous
1798 * behaviour(i.e make sure buffers are dropped upon return),
1799 * let's wait for the current transaction to finish flush of
1800 * dirty data buffers, then try to free those buffers again,
1801 * with the journal locked.
1802 */
1803 if (ret == 0 && (gfp_mask & __GFP_WAIT) && (gfp_mask & __GFP_FS)) {
1804 journal_wait_for_transaction_sync_data(journal);
1805 ret = try_to_free_buffers(page);
1806 }
1807
1808busy: 1760busy:
1809 return ret; 1761 return ret;
1810} 1762}