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authorHisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp>2009-06-17 20:08:51 -0400
committerTheodore Ts'o <tytso@mit.edu>2009-06-17 20:08:51 -0400
commit536fc240e7147858255bdb08e7a999a3351a9fb4 (patch)
tree16bf7a9e1bf506c1944d1e2e13a18a2b3c9bab8f
parent4159175058987cb68aefd0e9eec2598b795363b4 (diff)
jbd2: clean up jbd2_journal_try_to_free_buffers()
This patch reverts 3f31fddf, which is no longer needed because if a race between freeing buffer and committing transaction functionality occurs and dio gets error, currently dio falls back to buffered IO due to the commit 6ccfa806. Signed-off-by: Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp> Cc: Mingming Cao <cmm@us.ibm.com> Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
-rw-r--r--fs/jbd2/transaction.c49
1 files changed, 0 insertions, 49 deletions
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 996ffda06bf..494501edba6 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -1547,36 +1547,6 @@ out:
return;
}
-/*
- * jbd2_journal_try_to_free_buffers() could race with
- * jbd2_journal_commit_transaction(). The later might still hold the
- * reference count to the buffers when inspecting them on
- * t_syncdata_list or t_locked_list.
- *
- * jbd2_journal_try_to_free_buffers() will call this function to
- * wait for the current transaction to finish syncing data buffers, before
- * try to free that buffer.
- *
- * Called with journal->j_state_lock hold.
- */
-static void jbd2_journal_wait_for_transaction_sync_data(journal_t *journal)
-{
- transaction_t *transaction;
- tid_t tid;
-
- spin_lock(&journal->j_state_lock);
- transaction = journal->j_committing_transaction;
-
- if (!transaction) {
- spin_unlock(&journal->j_state_lock);
- return;
- }
-
- tid = transaction->t_tid;
- spin_unlock(&journal->j_state_lock);
- jbd2_log_wait_commit(journal, tid);
-}
-
/**
* int jbd2_journal_try_to_free_buffers() - try to free page buffers.
* @journal: journal for operation
@@ -1649,25 +1619,6 @@ int jbd2_journal_try_to_free_buffers(journal_t *journal,
ret = try_to_free_buffers(page);
- /*
- * There are a number of places where jbd2_journal_try_to_free_buffers()
- * could race with jbd2_journal_commit_transaction(), the later still
- * holds the reference to the buffers to free while processing them.
- * try_to_free_buffers() failed to free those buffers. Some of the
- * caller of releasepage() request page buffers to be dropped, otherwise
- * treat the fail-to-free as errors (such as generic_file_direct_IO())
- *
- * So, if the caller of try_to_release_page() wants the synchronous
- * behaviour(i.e make sure buffers are dropped upon return),
- * let's wait for the current transaction to finish flush of
- * dirty data buffers, then try to free those buffers again,
- * with the journal locked.
- */
- if (ret == 0 && (gfp_mask & __GFP_WAIT) && (gfp_mask & __GFP_FS)) {
- jbd2_journal_wait_for_transaction_sync_data(journal);
- ret = try_to_free_buffers(page);
- }
-
busy:
return ret;
}