ocfs2: throttle back local alloc when low on disk space

[linux-2.6-omap-h63xx.git] / fs / ocfs2 / ocfs2.h

diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 43dd42e313a12e0736f8cbcd44344e90a644b0c5..4d6e200a4843550e4124b07023f5fbb99ac8c5cd 100644 (file)
--- 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