ocfs2: local mounts

This allows users to format an ocfs2 file system with a special flag,
OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT. When the file system sees this flag, it
will not use any cluster services, nor will it require a cluster
configuration, thus acting like a 'local' file system.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 33 insertions, 13 deletions

diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index 1d7f4ab1e5ed..825cb0ae1b4c 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -144,8 +144,10 @@ handle_t *ocfs2_start_trans(struct ocfs2_super *osb, int max_buffs)
                         ocfs2_abort(osb->sb, "Detected aborted journal");
                         handle = ERR_PTR(-EROFS);
                 }
-        } else
-                atomic_inc(&(osb->journal->j_num_trans));
+        } else {
+                if (!ocfs2_mount_local(osb))
+                        atomic_inc(&(osb->journal->j_num_trans));
+        }
 
         return handle;
 }
@@ -507,9 +509,23 @@ void ocfs2_journal_shutdown(struct ocfs2_super *osb)
 
         BUG_ON(atomic_read(&(osb->journal->j_num_trans)) != 0);
 
-        status = ocfs2_journal_toggle_dirty(osb, 0);
-        if (status < 0)
-                mlog_errno(status);
+        if (ocfs2_mount_local(osb)) {
+                journal_lock_updates(journal->j_journal);
+                status = journal_flush(journal->j_journal);
+                journal_unlock_updates(journal->j_journal);
+                if (status < 0)
+                        mlog_errno(status);
+        }
+
+        if (status == 0) {
+                /*
+                 * Do not toggle if flush was unsuccessful otherwise
+                 * will leave dirty metadata in a "clean" journal
+                 */
+                status = ocfs2_journal_toggle_dirty(osb, 0);
+                if (status < 0)
+                        mlog_errno(status);
+        }
 
         /* Shutdown the kernel journal system */
         journal_destroy(journal->j_journal);
@@ -549,7 +565,7 @@ static void ocfs2_clear_journal_error(struct super_block *sb,
         }
 }
 
-int ocfs2_journal_load(struct ocfs2_journal *journal)
+int ocfs2_journal_load(struct ocfs2_journal *journal, int local)
 {
         int status = 0;
         struct ocfs2_super *osb;
@@ -576,14 +592,18 @@ int ocfs2_journal_load(struct ocfs2_journal *journal)
         }
 
         /* Launch the commit thread */
-        osb->commit_task = kthread_run(ocfs2_commit_thread, osb, "ocfs2cmt");
-        if (IS_ERR(osb->commit_task)) {
-                status = PTR_ERR(osb->commit_task);
+        if (!local) {
+                osb->commit_task = kthread_run(ocfs2_commit_thread, osb,
+                                               "ocfs2cmt");
+                if (IS_ERR(osb->commit_task)) {
+                        status = PTR_ERR(osb->commit_task);
+                        osb->commit_task = NULL;
+                        mlog(ML_ERROR, "unable to launch ocfs2commit thread, "
+                             "error=%d", status);
+                        goto done;
+                }
+        } else
                 osb->commit_task = NULL;
-                mlog(ML_ERROR, "unable to launch ocfs2commit thread, error=%d",
-                     status);
-                goto done;
-        }
 
 done:
         mlog_exit(status);