ocfs2: Structure updates for inline data

Add the disk, network and memory structures needed to support data in inode.

Struct ocfs2_inline_data is defined and embedded in ocfs2_dinode for storing
inline data.

A new inode field, i_dyn_features, is added to facilitate tracking of
dynamic inode state. Since it will be used often, we want to mirror it on
ocfs2_inode_info, and transfer it via the meta data lvb.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Reviewed-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 42 insertions, 2 deletions

diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index bf10a5453833..6ef876759a73 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -87,7 +87,8 @@
 
 #define OCFS2_FEATURE_COMPAT_SUPP       OCFS2_FEATURE_COMPAT_BACKUP_SB
 #define OCFS2_FEATURE_INCOMPAT_SUPP     (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
-                                         | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
+                                         | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
+                                         | OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
 #define OCFS2_FEATURE_RO_COMPAT_SUPP    OCFS2_FEATURE_RO_COMPAT_UNWRITTEN
 
 /*
@@ -121,6 +122,9 @@
  */
 #define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG    0x0020
 
+/* Support for data packed into inode blocks */
+#define OCFS2_FEATURE_INCOMPAT_INLINE_DATA      0x0040
+
 /*
  * backup superblock flag is used to indicate that this volume
  * has backup superblocks.
@@ -162,6 +166,17 @@
 #define OCFS2_CHAIN_FL          (0x00000400)    /* Chain allocator */
 #define OCFS2_DEALLOC_FL        (0x00000800)    /* Truncate log */
 
+/*
+ * Flags on ocfs2_dinode.i_dyn_features
+ *
+ * These can change much more often than i_flags. When adding flags,
+ * keep in mind that i_dyn_features is only 16 bits wide.
+ */
+#define OCFS2_INLINE_DATA_FL    (0x0001)        /* Data stored in inode block */
+#define OCFS2_HAS_XATTR_FL      (0x0002)
+#define OCFS2_INLINE_XATTR_FL   (0x0004)
+#define OCFS2_INDEXED_DIR_FL    (0x0008)
+
 /* Inode attributes, keep in sync with EXT2 */
 #define OCFS2_SECRM_FL          (0x00000001)    /* Secure deletion */
 #define OCFS2_UNRM_FL           (0x00000002)    /* Undelete */
@@ -487,6 +502,19 @@ struct ocfs2_local_alloc
 };
 
 /*
+ * Data-in-inode header. This is only used if i_dyn_features has
+ * OCFS2_INLINE_DATA_FL set.
+ */
+struct ocfs2_inline_data
+{
+/*00*/  __le16  id_count;       /* Number of bytes that can be used
+                                 * for data, starting at id_data */
+        __le16  id_reserved0;
+        __le32  id_reserved1;
+        __u8    id_data[0];     /* Start of user data */
+};
+
+/*
  * On disk inode for OCFS2
  */
 struct ocfs2_dinode {
@@ -518,7 +546,7 @@ struct ocfs2_dinode {
         __le32 i_attr;
         __le16 i_orphaned_slot;         /* Only valid when OCFS2_ORPHANED_FL
                                            was set in i_flags */
-        __le16 i_reserved1;
+        __le16 i_dyn_features;
 /*70*/  __le64 i_reserved2[8];
 /*B8*/  union {
                 __le64 i_pad1;          /* Generic way to refer to this
@@ -544,6 +572,7 @@ struct ocfs2_dinode {
                 struct ocfs2_chain_list         i_chain;
                 struct ocfs2_extent_list        i_list;
                 struct ocfs2_truncate_log       i_dealloc;
+                struct ocfs2_inline_data        i_data;
                 __u8                            i_symlink[0];
         } id2;
 /* Actual on-disk size is one block */
@@ -593,6 +622,12 @@ static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
                  offsetof(struct ocfs2_dinode, id2.i_symlink);
 }
 
+static inline int ocfs2_max_inline_data(struct super_block *sb)
+{
+        return sb->s_blocksize -
+                offsetof(struct ocfs2_dinode, id2.i_data.id_data);
+}
+
 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
 {
         int size;
@@ -672,6 +707,11 @@ static inline int ocfs2_fast_symlink_chars(int blocksize)
         return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
 }
 
+static inline int ocfs2_max_inline_data(int blocksize)
+{
+        return blocksize - offsetof(struct ocfs2_dinode, id2.i_data.id_data);
+}
+
 static inline int ocfs2_extent_recs_per_inode(int blocksize)
 {
         int size;