ocfs2: Re-journal buffers after transaction extend

ocfs2_extend_trans() might call journal_restart() which will commit dirty
buffers and then restart the transaction. This means that any buffers which
still need changes should be passed to journal_access() again. Some paths
during extend weren't doing this right.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

2 files changed, 51 insertions, 21 deletions

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 97f0db5167c4..23c8cda43f19 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -2389,6 +2389,18 @@ static int __ocfs2_rotate_tree_left(struct inode *inode,
                         goto out;
                 }
 
+                /*
+                 * Caller might still want to make changes to the
+                 * tree root, so re-add it to the journal here.
+                 */
+                ret = ocfs2_journal_access(handle, inode,
+                                           path_root_bh(left_path),
+                                           OCFS2_JOURNAL_ACCESS_WRITE);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
                 ret = ocfs2_rotate_subtree_left(inode, handle, left_path,
                                                 right_path, subtree_root,
                                                 dealloc, &deleted);
@@ -3289,16 +3301,6 @@ static int ocfs2_insert_path(struct inode *inode,
         int ret, subtree_index;
         struct buffer_head *leaf_bh = path_leaf_bh(right_path);
 
-        /*
-         * Pass both paths to the journal. The majority of inserts
-         * will be touching all components anyway.
-         */
-        ret = ocfs2_journal_access_path(inode, handle, right_path);
-        if (ret < 0) {
-                mlog_errno(ret);
-                goto out;
-        }
-
         if (left_path) {
                 int credits = handle->h_buffer_credits;
 
@@ -3323,6 +3325,16 @@ static int ocfs2_insert_path(struct inode *inode,
                 }
         }
 
+        /*
+         * Pass both paths to the journal. The majority of inserts
+         * will be touching all components anyway.
+         */
+        ret = ocfs2_journal_access_path(inode, handle, right_path);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out;
+        }
+
         if (insert->ins_split != SPLIT_NONE) {
                 /*
                  * We could call ocfs2_insert_at_leaf() for some types
@@ -3331,6 +3343,17 @@ static int ocfs2_insert_path(struct inode *inode,
                  */
                 ocfs2_split_record(inode, left_path, right_path,
                                    insert_rec, insert->ins_split);
+
+                /*
+                 * Split might have modified either leaf and we don't
+                 * have a guarantee that the later edge insert will
+                 * dirty this for us.
+                 */
+                if (left_path)
+                        ret = ocfs2_journal_dirty(handle,
+                                                  path_leaf_bh(left_path));
+                        if (ret)
+                                mlog_errno(ret);
         } else
                 ocfs2_insert_at_leaf(insert_rec, path_leaf_el(right_path),
                                      insert, inode);
@@ -3430,6 +3453,17 @@ static int ocfs2_do_insert_extent(struct inode *inode,
                         mlog_errno(ret);
                         goto out;
                 }
+
+                /*
+                 * ocfs2_rotate_tree_right() might have extended the
+                 * transaction without re-journaling our tree root.
+                 */
+                ret = ocfs2_journal_access(handle, inode, di_bh,
+                                           OCFS2_JOURNAL_ACCESS_WRITE);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
         } else if (type->ins_appending == APPEND_TAIL
                    && type->ins_contig != CONTIG_LEFT) {
                 ret = ocfs2_append_rec_to_path(inode, handle, insert_rec,
@@ -3941,7 +3975,7 @@ static int __ocfs2_mark_extent_written(struct inode *inode,
 {
         int ret = 0;
         struct ocfs2_extent_list *el = path_leaf_el(path);
-        struct buffer_head *eb_bh, *last_eb_bh = NULL;
+        struct buffer_head *last_eb_bh = NULL;
         struct ocfs2_extent_rec *rec = &el->l_recs[split_index];
         struct ocfs2_merge_ctxt ctxt;
         struct ocfs2_extent_list *rightmost_el;
@@ -3960,14 +3994,6 @@ static int __ocfs2_mark_extent_written(struct inode *inode,
                 goto out;
         }
 
-        eb_bh = path_leaf_bh(path);
-        ret = ocfs2_journal_access(handle, inode, eb_bh,
-                                   OCFS2_JOURNAL_ACCESS_WRITE);
-        if (ret) {
-                mlog_errno(ret);
-                goto out;
-        }
-
         ctxt.c_contig_type = ocfs2_figure_merge_contig_type(inode, el,
                                                             split_index,
                                                             split_rec);
@@ -4029,8 +4055,6 @@ static int __ocfs2_mark_extent_written(struct inode *inode,
                         mlog_errno(ret);
         }
 
-        ocfs2_journal_dirty(handle, eb_bh);
-
 out:
         brelse(last_eb_bh);
         return ret;
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index 0e1250c2ef44..8d81f6c1b877 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -174,6 +174,12 @@ int ocfs2_commit_trans(struct ocfs2_super *osb,
  * transaction. extend_trans will either extend the current handle by
  * nblocks, or commit it and start a new one with nblocks credits.
  *
+ * This might call journal_restart() which will commit dirty buffers
+ * and then restart the transaction. Before calling
+ * ocfs2_extend_trans(), any changed blocks should have been
+ * dirtied. After calling it, all blocks which need to be changed must
+ * go through another set of journal_access/journal_dirty calls.
+ *
  * WARNING: This will not release any semaphores or disk locks taken
  * during the transaction, so make sure they were taken *before*
  * start_trans or we'll have ordering deadlocks.