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ocfs2: Support nested transactions 

OCFS2 can easily support nested transactions. We just have to
take care and not spoil statistics acquire semaphore unnecessarily.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Jan Kara 2008-08-27 22:30:28 +02:00 committed by Mark Fasheh
parent 12c77527e4
commit 90e86a63ea
1 changed files with 7 additions and 7 deletions
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14
fs/ocfs2/journal.c
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@ -256,11 +256,9 @@ handle_t *ocfs2_start_trans(struct ocfs2_super *osb, int max_buffs)
BUG_ON(osb->journal->j_state == OCFS2_JOURNAL_FREE);
BUG_ON(max_buffs <= 0);
/* JBD might support this, but our journalling code doesn't yet. */
if (journal_current_handle()) {
mlog(ML_ERROR, "Recursive transaction attempted!\n");
BUG();
}
/* Nested transaction? Just return the handle... */
if (journal_current_handle())
return jbd2_journal_start(journal, max_buffs);
down_read(&osb->journal->j_trans_barrier);
@ -285,16 +283,18 @@ handle_t *ocfs2_start_trans(struct ocfs2_super *osb, int max_buffs)
int ocfs2_commit_trans(struct ocfs2_super *osb,
handle_t *handle)
{
int ret;
int ret, nested;
struct ocfs2_journal *journal = osb->journal;
BUG_ON(!handle);
nested = handle->h_ref > 1;
ret = jbd2_journal_stop(handle);
if (ret < 0)
mlog_errno(ret);
up_read(&journal->j_trans_barrier);
if (!nested)
up_read(&journal->j_trans_barrier);
return ret;
}