@@ -219,7 +219,6 @@ static int journal_submit_data_buffers(journal_t *journal,
ret = err;
spin_lock(&journal->j_list_lock);
J_ASSERT(jinode->i_transaction == commit_transaction);
- commit_transaction->t_flushed_data_blocks = 1;
clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags);
smp_mb__after_clear_bit();
wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING);
@@ -683,7 +682,7 @@ start_journal_io:
* then we must flush the file system device before we issue
* the commit record
*/
- if (commit_transaction->t_flushed_data_blocks &&
+ if (commit_transaction->t_need_data_flush &&
(journal->j_fs_dev != journal->j_dev) &&
(journal->j_flags & JBD2_BARRIER))
blkdev_issue_flush(journal->j_fs_dev, GFP_KERNEL, NULL);
@@ -2147,6 +2147,13 @@ int jbd2_journal_file_inode(handle_t *handle, struct jbd2_inode *jinode)
jinode->i_next_transaction == transaction)
goto done;
+ /*
+ * We only ever set this variable to 1 so the test is safe. Since
+ * t_need_data_flush is likely to be set, we do the test to save some
+ * cacheline bouncing
+ */
+ if (!transaction->t_need_data_flush)
+ transaction->t_need_data_flush = 1;
/* On some different transaction's list - should be
* the committing one */
if (jinode->i_transaction) {
@@ -658,7 +658,9 @@ struct transaction_s
* waiting for it to finish.
*/
unsigned int t_synchronous_commit:1;
- unsigned int t_flushed_data_blocks:1;
+
+ /* Disk flush needs to be sent to fs partition [no locking] */
+ int t_need_data_flush;
/*
* For use by the filesystem to store fs-specific data
It can theoretically happen, that in data=ordered mode inode is filed to transaction's t_inode_list, then flusher thread writes all the data and inode is reclaimed before transaction starts to commit. In such case we could errorneously ommit sending a flush to filesystem device when it is different from the journal device (because data can still be in disk cache only). Fix the problem by setting a flag in a transaction when some inode is added to it and then send disk flush in the commit code when the flag is set. Signed-off-by: Jan Kara <jack@suse.cz> --- fs/jbd2/commit.c | 3 +-- fs/jbd2/transaction.c | 7 +++++++ include/linux/jbd2.h | 4 +++- 3 files changed, 11 insertions(+), 3 deletions(-)