ocfs2: Make the ocfs2_caching_info structure self-contained.

We want to use the ocfs2_caching_info structure in places that are not
inodes.  To do that, it can no longer rely on referencing the inode
directly.

This patch moves the flags to ocfs2_caching_info->ci_flags, stores
pointers to the parent's locks on the ocfs2_caching_info, and renames
the constants and flags to reflect its independant state.

Signed-off-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 21 insertions, 2 deletions

diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 39e1d5a39505..eef3bd077c10 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -51,17 +51,36 @@
 /* For struct ocfs2_blockcheck_stats */
 #include "blockcheck.h"
 
+
+/* Caching of metadata buffers */
+
 /* Most user visible OCFS2 inodes will have very few pieces of
  * metadata, but larger files (including bitmaps, etc) must be taken
  * into account when designing an access scheme. We allow a small
  * amount of inlined blocks to be stored on an array and grow the
  * structure into a rb tree when necessary. */
-#define OCFS2_INODE_MAX_CACHE_ARRAY 2
+#define OCFS2_CACHE_INFO_MAX_ARRAY 2
+
+/* Flags for ocfs2_caching_info */
+
+enum ocfs2_caching_info_flags {
+        /* Indicates that the metadata cache is using the inline array */
+        OCFS2_CACHE_FL_INLINE   = 1<<1,
+};
 
 struct ocfs2_caching_info {
+        /*
+         * The parent structure provides the locks, but because the
+         * parent structure can differ, struct ocfs2_caching_info needs
+         * its own pointers to them.
+         */
+        spinlock_t              *ci_lock;
+        struct mutex            *ci_io_mutex;
+
+        unsigned int            ci_flags;
         unsigned int            ci_num_cached;
         union {
-                sector_t        ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
+        sector_t        ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
                 struct rb_root  ci_tree;
         } ci_cache;
 };