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jbd2: Modify ASYNC_COMMIT code to not rely on queue draining on barrier 

Currently JBD2 relies blkdev_issue_flush() draining the queue when ASYNC_COMMIT
feature is set. This property is going away so make JBD2 wait for buffers it
needs on its own before submitting the cache flush.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Jan Kara 2010-08-18 15:56:56 +02:00 committed by Jens Axboe
parent 4524451ef7
commit f73bee4985
1 changed files with 16 additions and 13 deletions
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29
fs/jbd2/commit.c
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@ -701,6 +701,16 @@ start_journal_io:
}
}
err = journal_finish_inode_data_buffers(journal, commit_transaction);
if (err) {
printk(KERN_WARNING
"JBD2: Detected IO errors while flushing file data "
"on %s\n", journal->j_devname);
if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR)
jbd2_journal_abort(journal, err);
err = 0;
}
/*
* If the journal is not located on the file system device,
* then we must flush the file system device before we issue
@ -719,19 +729,6 @@ start_journal_io:
&cbh, crc32_sum);
if (err)
__jbd2_journal_abort_hard(journal);
if (journal->j_flags & JBD2_BARRIER)
blkdev_issue_flush(journal->j_dev, GFP_KERNEL, NULL,
BLKDEV_IFL_WAIT);
}
err = journal_finish_inode_data_buffers(journal, commit_transaction);
if (err) {
printk(KERN_WARNING
"JBD2: Detected IO errors while flushing file data "
"on %s\n", journal->j_devname);
if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR)
jbd2_journal_abort(journal, err);
err = 0;
}
/* Lo and behold: we have just managed to send a transaction to
@ -845,6 +842,12 @@ wait_for_iobuf:
}
if (!err && !is_journal_aborted(journal))
err = journal_wait_on_commit_record(journal, cbh);
if (JBD2_HAS_INCOMPAT_FEATURE(journal,
JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT) &&
journal->j_flags & JBD2_BARRIER) {
blkdev_issue_flush(journal->j_dev, GFP_KERNEL, NULL,
BLKDEV_IFL_WAIT);
}
if (err)
jbd2_journal_abort(journal, err);