ocfs2: Define refcount tree structure.
Signed-off-by: Tao Ma <tao.ma@oracle.com>
diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index 7ab6e9e..e4288b4 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -68,6 +68,7 @@
#define OCFS2_DIR_TRAILER_SIGNATURE "DIRTRL1"
#define OCFS2_DX_ROOT_SIGNATURE "DXDIR01"
#define OCFS2_DX_LEAF_SIGNATURE "DXLEAF1"
+#define OCFS2_REFCOUNT_BLOCK_SIGNATURE "REFCNT1"
/* Compatibility flags */
#define OCFS2_HAS_COMPAT_FEATURE(sb,mask) \
@@ -160,6 +161,9 @@
/* Metadata checksum and error correction */
#define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800
+/* Refcount tree support */
+#define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE 0x1000
+
/*
* backup superblock flag is used to indicate that this volume
* has backup superblocks.
@@ -223,6 +227,7 @@
#define OCFS2_HAS_XATTR_FL (0x0002)
#define OCFS2_INLINE_XATTR_FL (0x0004)
#define OCFS2_INDEXED_DIR_FL (0x0008)
+#define OCFS2_HAS_REFCOUNT_FL (0x0010)
/* Inode attributes, keep in sync with EXT2 */
#define OCFS2_SECRM_FL (0x00000001) /* Secure deletion */
@@ -241,8 +246,11 @@
/*
* Extent record flags (e_node.leaf.flags)
*/
-#define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but
- * unwritten */
+#define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but
+ * unwritten */
+#define OCFS2_EXT_REFCOUNTED (0x02) /* Extent is reference
+ * counted in an associated
+ * refcount tree */
/*
* ioctl commands
@@ -717,7 +725,8 @@
__le64 i_xattr_loc;
/*80*/ struct ocfs2_block_check i_check; /* Error checking */
/*88*/ __le64 i_dx_root; /* Pointer to dir index root block */
- __le64 i_reserved2[5];
+/*90*/ __le64 i_refcount_loc;
+ __le64 i_reserved2[4];
/*B8*/ union {
__le64 i_pad1; /* Generic way to refer to this
64bit union */
@@ -901,6 +910,59 @@
/*40*/ __u8 bg_bitmap[0];
};
+struct ocfs2_refcount_rec {
+/*00*/ __le64 r_cpos; /* Physical offset, in clusters */
+ __le32 r_clusters; /* Clusters covered by this extent */
+ __le32 r_refcount; /* Reference count of this extent */
+/*10*/
+};
+
+#define OCFS2_REFCOUNT_LEAF_FL (0x00000001)
+#define OCFS2_REFCOUNT_TREE_FL (0x00000002)
+
+struct ocfs2_refcount_list {
+/*00*/ __le16 rl_count; /* Maximum number of entries possible
+ in rl_records */
+ __le16 rl_used; /* Current number of used records */
+ __le32 rl_reserved2;
+ __le64 rl_reserved1; /* Pad to sizeof(ocfs2_refcount_record) */
+/*10*/ struct ocfs2_refcount_rec rl_recs[0]; /* Refcount records */
+};
+
+
+struct ocfs2_refcount_block {
+/*00*/ __u8 rf_signature[8]; /* Signature for verification */
+ __le16 rf_suballoc_slot; /* Slot suballocator this block
+ belongs to */
+ __le16 rf_suballoc_bit; /* Bit offset in suballocator
+ block group */
+ __le32 rf_fs_generation; /* Must match superblock */
+/*10*/ __le64 rf_blkno; /* Offset on disk, in blocks */
+ __le64 rf_parent; /* Parent block, only valid if
+ OCFS2_REFCOUNT_LEAF_FL is set in
+ rf_flags */
+/*20*/ struct ocfs2_block_check rf_check; /* Error checking */
+ __le64 rf_last_eb_blk; /* Pointer to last extent block */
+/*30*/ __le32 rf_count; /* Number of inodes sharing this
+ refcount tree */
+ __le32 rf_flags; /* See the flags above */
+ __le32 rf_clusters; /* clusters covered by refcount tree. */
+ __le32 rf_cpos; /* cluster offset in refcount tree.*/
+/*40*/ __le32 rf_generation; /* generation number. all be the same
+ * for the same refcount tree. */
+ __le32 rf_reserved0;
+ __le64 rf_reserved1[7];
+/*80*/ union {
+ struct ocfs2_refcount_list rf_records; /* List of refcount
+ records */
+ struct ocfs2_extent_list rf_list; /* Extent record list,
+ only valid if
+ OCFS2_REFCOUNT_TREE_FL
+ is set in rf_flags */
+ };
+/* Actual on-disk size is one block */
+};
+
/*
* On disk extended attribute structure for OCFS2.
*/
@@ -1312,6 +1374,26 @@
return size / sizeof(struct ocfs2_extent_rec);
}
+
+static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb)
+{
+ int size;
+
+ size = sb->s_blocksize -
+ offsetof(struct ocfs2_refcount_block, rf_list.l_recs);
+
+ return size / sizeof(struct ocfs2_extent_rec);
+}
+
+static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb)
+{
+ int size;
+
+ size = sb->s_blocksize -
+ offsetof(struct ocfs2_refcount_block, rf_records.rl_recs);
+
+ return size / sizeof(struct ocfs2_refcount_rec);
+}
#else
static inline int ocfs2_fast_symlink_chars(int blocksize)
{