1 files changed, 19 insertions, 4 deletions

diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 43dd42e313a1..4d6e200a4843 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -171,9 +171,13 @@ struct ocfs2_alloc_stats
 
 enum ocfs2_local_alloc_state
 {
-        OCFS2_LA_UNUSED = 0,
-        OCFS2_LA_ENABLED,
-        OCFS2_LA_DISABLED
+        OCFS2_LA_UNUSED = 0,    /* Local alloc will never be used for
+                                 * this mountpoint. */
+        OCFS2_LA_ENABLED,       /* Local alloc is in use. */
+        OCFS2_LA_THROTTLED,     /* Local alloc is in use, but number
+                                 * of bits has been reduced. */
+        OCFS2_LA_DISABLED       /* Local alloc has temporarily been
+                                 * disabled. */
 };
 
 enum ocfs2_mount_options
@@ -252,9 +256,20 @@ struct ocfs2_super
         struct ocfs2_journal *journal;
         unsigned long osb_commit_interval;
 
+        struct delayed_work             la_enable_wq;
+
+        /*
+         * Must hold local alloc i_mutex and osb->osb_lock to change
+         * local_alloc_bits. Reads can be done under either lock.
+         */
         unsigned int local_alloc_bits;
-        enum ocfs2_local_alloc_state local_alloc_state;
+        unsigned int local_alloc_default_bits;
+
+        enum ocfs2_local_alloc_state local_alloc_state; /* protected
+                                                         * by osb_lock */
+
         struct buffer_head *local_alloc_bh;
+
         u64 la_last_gd;
 
         /* Next two fields are for local node slot recovery during