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jbd2: optimize jbd2_log_do_checkpoint() a bit

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When we discover written out buffer in transaction checkpoint list we
don't have to recheck validity of a transaction. Either this is the
last buffer in a transaction - and then we are done - or this isn't
and then we can just take another buffer from the checkpoint list
without dropping j_list_lock.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2014-09-04 18:09:29 -04:00 committed by Theodore Ts'o
parent dc6e8d669c
commit 0e5ecf0a76
1 changed files with 4 additions and 3 deletions
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7
fs/jbd2/checkpoint.c
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@ -285,9 +285,10 @@ int jbd2_log_do_checkpoint(journal_t *journal)
if (unlikely(buffer_write_io_error(bh)) && !result)
result = -EIO;
BUFFER_TRACE(bh, "remove from checkpoint");
__jbd2_journal_remove_checkpoint(jh);
spin_unlock(&journal->j_list_lock);
goto retry;
if (__jbd2_journal_remove_checkpoint(jh))
/* The transaction was released; we're done */
goto out;
continue;
}
/*
* Important: we are about to write the buffer, and