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-rw-r--r--fs/ocfs2/ocfs2.h23
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 @@
51/* For struct ocfs2_blockcheck_stats */ 51/* For struct ocfs2_blockcheck_stats */
52#include "blockcheck.h" 52#include "blockcheck.h"
53 53
54
55/* Caching of metadata buffers */
56
54/* Most user visible OCFS2 inodes will have very few pieces of 57/* Most user visible OCFS2 inodes will have very few pieces of
55 * metadata, but larger files (including bitmaps, etc) must be taken 58 * metadata, but larger files (including bitmaps, etc) must be taken
56 * into account when designing an access scheme. We allow a small 59 * into account when designing an access scheme. We allow a small
57 * amount of inlined blocks to be stored on an array and grow the 60 * amount of inlined blocks to be stored on an array and grow the
58 * structure into a rb tree when necessary. */ 61 * structure into a rb tree when necessary. */
59#define OCFS2_INODE_MAX_CACHE_ARRAY 2 62#define OCFS2_CACHE_INFO_MAX_ARRAY 2
63
64/* Flags for ocfs2_caching_info */
65
66enum ocfs2_caching_info_flags {
67 /* Indicates that the metadata cache is using the inline array */
68 OCFS2_CACHE_FL_INLINE = 1<<1,
69};
60 70
61struct ocfs2_caching_info { 71struct ocfs2_caching_info {
72 /*
73 * The parent structure provides the locks, but because the
74 * parent structure can differ, struct ocfs2_caching_info needs
75 * its own pointers to them.
76 */
77 spinlock_t *ci_lock;
78 struct mutex *ci_io_mutex;
79
80 unsigned int ci_flags;
62 unsigned int ci_num_cached; 81 unsigned int ci_num_cached;
63 union { 82 union {
64 sector_t ci_array[OCFS2_INODE_MAX_CACHE_ARRAY]; 83 sector_t ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
65 struct rb_root ci_tree; 84 struct rb_root ci_tree;
66 } ci_cache; 85 } ci_cache;
67}; 86};