ocfs2: Convert to new freezing mechanism

Protect ocfs2_page_mkwrite() and ocfs2_file_aio_write() using the new freeze
protection. We also protect several ioctl entry points which were missing the
protection. Finally, we add freeze protection to the journaling mechanism so
that iput() of unlinked inode cannot modify a frozen filesystem.

CC: Mark Fasheh <mfasheh@suse.com>
CC: Joel Becker <jlbec@evilplan.org>
CC: ocfs2-devel@oss.oracle.com
Acked-by: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 6 insertions, 1 deletions

diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index 0a42ae96dca7..2dd36af79e26 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -355,11 +355,14 @@ handle_t *ocfs2_start_trans(struct ocfs2_super *osb, int max_buffs)
         if (journal_current_handle())
                 return jbd2_journal_start(journal, max_buffs);
 
+        sb_start_intwrite(osb->sb);
+
         down_read(&osb->journal->j_trans_barrier);
 
         handle = jbd2_journal_start(journal, max_buffs);
         if (IS_ERR(handle)) {
                 up_read(&osb->journal->j_trans_barrier);
+                sb_end_intwrite(osb->sb);
 
                 mlog_errno(PTR_ERR(handle));
 
@@ -388,8 +391,10 @@ int ocfs2_commit_trans(struct ocfs2_super *osb,
         if (ret < 0)
                 mlog_errno(ret);
 
-        if (!nested)
+        if (!nested) {
                 up_read(&journal->j_trans_barrier);
+                sb_end_intwrite(osb->sb);
+        }
 
         return ret;
 }