[f2fs-dev][PATCH 1/5] f2fs: add infra macro and sturct for inline dir

[Chao Yu]

This patch defines macro and inline dentry struct for inline dir infrastructure.

Signed-off-by: Chao Yu <chao2.yu@xxxxxxxxxxx>
---
 include/linux/f2fs_fs.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
index 6ff0b0b..a79726b 100644
--- a/include/linux/f2fs_fs.h
+++ b/include/linux/f2fs_fs.h
@@ -423,6 +423,24 @@ struct f2fs_dentry_block {
 	__u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
 } __packed;
 
+/* for inline dir */
+#define NR_INLINE_DENTRY	(MAX_INLINE_DATA * BITS_PER_BYTE / \
+				((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
+				BITS_PER_BYTE + 1))
+#define INLINE_DENTRY_BITMAP_SIZE	((NR_INLINE_DENTRY + \
+					BITS_PER_BYTE - 1) / BITS_PER_BYTE)
+#define INLINE_RESERVED_SIZE	(MAX_INLINE_DATA - \
+				((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
+				NR_INLINE_DENTRY + INLINE_DENTRY_BITMAP_SIZE))
+
+/* inline directory entry structure */
+struct f2fs_inline_dentry {
+	__u8 dentry_bitmap[INLINE_DENTRY_BITMAP_SIZE];
+	__u8 reserved[INLINE_RESERVED_SIZE];
+	struct f2fs_dir_entry dentry[NR_INLINE_DENTRY];
+	__u8 filename[NR_INLINE_DENTRY][F2FS_SLOT_LEN];
+} __packed;
+
 /* file types used in inode_info->flags */
 enum {
 	F2FS_FT_UNKNOWN,
-- 
2.0.1.474.g72c7794


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