Message-Id: <1375436989-18948-8-git-send-email-wenqing.lz@taobao.com>
Date:	Fri,  2 Aug 2013 17:49:34 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	linux-ext4@...r.kernel.org
Cc:	Theodore Ts'o <tytso@....edu>, Zheng Liu <wenqing.lz@...bao.com>
Subject: [PATCH v1 07/22] debugfs: make mkdir and expanddir command support inline data

From: Zheng Liu <wenqing.lz@...bao.com>

This commit tries to make mkdir and expanddir command support inline
date feature.

In ext2fs_expand_dir() function ext2fs_inline_data_convert() will be
called to expand a directory with inline data.  It tries to allocate
a block and copy all directory entries into it.

In ext2fs_mkdir() it calls ext2fs_new_dir_inline_data() function to
create a new directory with inline data.

Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
---
 lib/ext2fs/expanddir.c   |   18 +--
 lib/ext2fs/ext2fs.h      |    5 +
 lib/ext2fs/ext2fsP.h     |   13 +++
 lib/ext2fs/inline_data.c |  280 ++++++++++++++++++++++++++++++++++++++++++++++
 lib/ext2fs/mkdir.c       |  102 +++++++++++++----
 lib/ext2fs/newdir.c      |   33 ++++++
 6 files changed, 420 insertions(+), 31 deletions(-)

diff --git a/lib/ext2fs/expanddir.c b/lib/ext2fs/expanddir.c
index 22558d6..9696b61 100644
--- a/lib/ext2fs/expanddir.c
+++ b/lib/ext2fs/expanddir.c
@@ -19,13 +19,7 @@
 #include "ext2_fs.h"
 #include "ext2fs.h"
 
-struct expand_dir_struct {
-	int		done;
-	int		newblocks;
-	blk64_t		goal;
-	errcode_t	err;
-	ext2_ino_t	dir;
-};
+#include "ext2fsP.h"
 
 static int expand_dir_proc(ext2_filsys	fs,
 			   blk64_t	*blocknr,
@@ -114,6 +108,16 @@ errcode_t ext2fs_expand_dir(ext2_filsys fs, ext2_ino_t dir)
 	es.newblocks = 0;
 	es.dir = dir;
 
+	if (ext2fs_inode_has_inline_data(fs, dir)) {
+		retval = ext2fs_inline_data_convert(fs, dir, &es);
+		if (retval)
+			return retval;
+		if (!es.done)
+			return EXT2_ET_EXPAND_DIR_ERR;
+
+		return 0;
+	}
+
 	retval = ext2fs_block_iterate3(fs, dir, BLOCK_FLAG_APPEND,
 				       0, expand_dir_proc, &es);
 
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 6e3bf6e..934dbd0 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -1356,6 +1356,9 @@ extern errcode_t ext2fs_inline_data_iterate(ext2_filsys fs,
 						  struct ext2_inode_large *inode,
 						  void *priv_data),
 				      void *priv_data);
+extern errcode_t ext2fs_inline_data_create(ext2_filsys fs,
+					   struct ext2_inode_large *inode,
+					   unsigned int len);
 
 /* inode.c */
 extern void ext2fs_free_inode_cache(struct ext2_inode_cache *icache);
@@ -1430,6 +1433,8 @@ int ext2fs_native_flag(void);
 /* newdir.c */
 extern errcode_t ext2fs_new_dir_block(ext2_filsys fs, ext2_ino_t dir_ino,
 				ext2_ino_t parent_ino, char **block);
+extern errcode_t ext2fs_new_dir_inline_data(ext2_filsys fs, ext2_ino_t dir_ino,
+				ext2_ino_t parent_ino, struct ext2_inode *inode);
 
 /* mkdir.c */
 extern errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
diff --git a/lib/ext2fs/ext2fsP.h b/lib/ext2fs/ext2fsP.h
index e86d452..ed89272 100644
--- a/lib/ext2fs/ext2fsP.h
+++ b/lib/ext2fs/ext2fsP.h
@@ -62,6 +62,17 @@ struct dir_context {
 };
 
 /*
+ * For expanding directory
+ */
+struct expand_dir_struct {
+	int		done;
+	int		newblocks;
+	blk64_t		goal;
+	errcode_t	err;
+	ext2_ino_t	dir;
+};
+
+/*
  * Inode cache structure
  */
 struct ext2_inode_cache {
@@ -97,6 +108,8 @@ extern int ext2fs_process_dir_inline_data(ext2_filsys	fs,
 extern errcode_t ext2fs_inline_data_find(ext2_filsys fs,
 					 struct ext2_inode_large *inode,
 					 struct inline_data *data);
+extern errcode_t ext2fs_inline_data_convert(ext2_filsys fs, ext2_ino_t ino,
+					    void *priv_data);
 
 /* Generic numeric progress meter */
 
diff --git a/lib/ext2fs/inline_data.c b/lib/ext2fs/inline_data.c
index 1220418..c936e28 100644
--- a/lib/ext2fs/inline_data.c
+++ b/lib/ext2fs/inline_data.c
@@ -21,6 +21,14 @@
 
 static void *ext2fs_get_inline_xattr_pos(struct ext2_inode_large *inode,
 					 struct inline_data *data);
+static void ext2fs_inline_data_finish_convert(ext2_filsys fs, ext2_ino_t ino,
+					      char *target, char *buf,
+					      int inline_size);
+static void ext2fs_update_final_de(ext2_filsys fs, char *de_buf,
+				   int old_size, int new_size);
+static errcode_t ext2fs_inline_data_destory_data(ext2_filsys fs, ext2_ino_t ino,
+					   struct ext2_inode_large *inode,
+					   struct inline_data *data);
 
 errcode_t ext2fs_inline_data_find(ext2_filsys fs,
 				  struct ext2_inode_large *inode,
@@ -68,6 +76,48 @@ static void *ext2fs_get_inline_xattr_pos(struct ext2_inode_large *inode,
 	return (void *) (IFIRST(header) + entry->e_value_offs);
 }
 
+static errcode_t ext2fs_inline_data_destory_data(ext2_filsys fs, ext2_ino_t ino,
+						 struct ext2_inode_large *inode,
+						 struct inline_data *data)
+{
+	struct ext2_ext_attr_ibody_header *header;
+	struct ext2_ext_attr_search s = {
+		.not_found = ENODATA,
+	};
+	struct ext2_ext_attr_info i = {
+		.name_index = EXT4_EXT_ATTR_INDEX_SYSTEM,
+		.name = EXT4_EXT_ATTR_SYSTEM_DATA,
+		.value = "",
+		.value_len = 0,
+	};
+	errcode_t retval;
+
+	if (!data->inline_off)
+		return 0;
+
+	if (inode->i_extra_isize > (EXT2_INODE_SIZE(fs->super) -
+				    EXT2_GOOD_OLD_INODE_SIZE))
+		return EXT2_ET_BAD_EXTRA_SIZE;
+
+	header = IHDR(inode);
+	if (header->h_magic != EXT2_EXT_ATTR_MAGIC)
+		return EXT2_ET_BAD_EXT_ATTR_MAGIC;
+
+	retval = ext2fs_ext_attr_ibody_find(fs, inode, &i, &s);
+	if (retval)
+		return retval;
+
+	if (!s.not_found) {
+		retval = ext2fs_ext_attr_set_entry(&i, &s);
+		if (retval)
+			return retval;
+	}
+
+	memset((void *)inode->i_block, 0, EXT4_MIN_INLINE_DATA_SIZE);
+
+	return 0;
+}
+
 int ext2fs_inode_has_inline_data(ext2_filsys fs, ext2_ino_t ino)
 {
 	struct ext2_inode inode;
@@ -107,6 +157,83 @@ out:
 	return size;
 }
 
+static void ext2fs_update_final_de(ext2_filsys fs, char *de_buf,
+				   int old_size, int new_size)
+{
+	struct ext2_dir_entry *de, *prev_de;
+	char *limit;
+	unsigned int de_len;
+
+	de = (struct ext2_dir_entry *)de_buf;
+	if (old_size) {
+		limit = de_buf + old_size;
+		do {
+			prev_de = de;
+			ext2fs_get_rec_len(fs, de, &de_len);
+			de_buf += de_len;
+			de = (struct ext2_dir_entry *)de_buf;
+		} while (de_buf < limit);
+
+		ext2fs_set_rec_len(fs, de_len + new_size - old_size,
+				   prev_de);
+	} else {
+		de->inode = 0;
+		ext2fs_set_rec_len(fs, new_size, de);
+	}
+}
+
+static void ext2fs_inline_data_finish_convert(ext2_filsys fs, ext2_ino_t ino,
+					      char *target, char *buf,
+					      int inline_size)
+{
+	struct ext2_dir_entry *de;
+	struct ext2_dir_entry_tail *t;
+	int header_size = 0;
+	int csum_size = 0;
+	int filetype = 0;
+
+	if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+		csum_size = sizeof(struct ext2_dir_entry_tail);
+
+	/* First create '.' and '..' */
+	if (fs->super->s_feature_incompat &
+	    EXT2_FEATURE_INCOMPAT_FILETYPE)
+		filetype = EXT2_FT_DIR << 8;
+
+	de = (struct ext2_dir_entry *)target;
+	de->inode = ino;
+	de->name_len = 1 | filetype;
+	de->name[0] = '.';
+	de->name[1] = '\0';
+	de->rec_len = EXT2_DIR_REC_LEN(1);
+
+	de = (struct ext2_dir_entry *)(target + de->rec_len);
+	de->rec_len = EXT2_DIR_REC_LEN(2);
+	de->inode = ((struct ext2_dir_entry *)buf)->inode;
+	de->name_len = 2 | filetype;
+	de->name[0] = '.';
+	de->name[1] = '.';
+	de->name[2] = '\0';
+
+	de = (struct ext2_dir_entry *)(target +
+				       EXT2_DIR_REC_LEN(1) +
+				       EXT2_DIR_REC_LEN(2));
+	header_size = (char *)de - (char *)target;
+
+	memcpy((void *)de, buf + EXT4_INLINE_DATA_DOTDOT_SIZE,
+		inline_size - EXT4_INLINE_DATA_DOTDOT_SIZE);
+
+	ext2fs_update_final_de(fs, target,
+		inline_size - EXT4_INLINE_DATA_DOTDOT_SIZE + header_size,
+		fs->blocksize - csum_size);
+
+	if (csum_size) {
+		t = EXT2_DIRENT_TAIL(target, fs->blocksize);
+		ext2fs_initialize_dirent_tail(fs, t);
+	}
+}
+
 errcode_t ext2fs_inline_data_iterate(ext2_filsys fs,
 			       ext2_ino_t ino,
 			       int flags,
@@ -188,3 +315,156 @@ out:
 	ext2fs_free_mem(&inode);
 	return retval & BLOCK_ERROR ? ctx->errcode : 0;
 }
+
+errcode_t ext2fs_inline_data_convert(ext2_filsys fs,
+				     ext2_ino_t  ino,
+				     void *priv_data)
+{
+	struct expand_dir_struct *es;
+	struct ext2_inode_large *inode;
+	struct inline_data data;
+	ext2_extent_handle_t handle;
+	errcode_t retval;
+	blk64_t blk;
+	char *backup_buf;
+	char *blk_buf;
+	unsigned int inline_size;
+
+	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+	es = (struct expand_dir_struct *)priv_data;
+	retval = ext2fs_get_mem(EXT2_INODE_SIZE(fs->super), &inode);
+	if (retval)
+		return retval;
+
+	retval = ext2fs_read_inode_full(fs, ino, (void *)inode,
+					EXT2_INODE_SIZE(fs->super));
+	if (retval)
+		goto out;
+
+	retval = ext2fs_inline_data_find(fs, inode, &data);
+	if (retval)
+		goto out;
+
+	inline_size = data.inline_size;
+	retval = ext2fs_get_mem(inline_size, &backup_buf);
+	if (retval)
+		goto out;
+
+	memcpy(backup_buf, (void *)inode->i_block, EXT4_MIN_INLINE_DATA_SIZE);
+	if (inline_size > EXT4_MIN_INLINE_DATA_SIZE)
+		memcpy(backup_buf + EXT4_MIN_INLINE_DATA_SIZE,
+		       ext2fs_get_inline_xattr_pos(inode, &data),
+		       inline_size - EXT4_MIN_INLINE_DATA_SIZE);
+
+	/* clear the entry and the flag in dir now */
+	retval = ext2fs_inline_data_destory_data(fs, ino, inode, &data);
+	if (retval)
+		goto out1;
+
+	if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) {
+		if (LINUX_S_ISDIR(inode->i_mode) ||
+		    LINUX_S_ISREG(inode->i_mode) ||
+		    LINUX_S_ISLNK(inode->i_mode))
+			inode->i_flags |= EXT4_EXTENTS_FL;
+	}
+
+	inode->i_flags &= ~EXT4_INLINE_DATA_FL;
+
+	retval = ext2fs_new_block2(fs, 0, 0, &blk);
+	if (retval)
+		goto out1;
+
+	ext2fs_iblk_set(fs, (void*)inode, 1);
+	if (!(fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS))
+		inode->i_block[0] = blk;
+	inode->i_size = fs->blocksize;
+
+	retval = ext2fs_get_mem(fs->blocksize, &blk_buf);
+	if (retval)
+		goto out1;
+
+	memset(blk_buf, 0, sizeof(fs->blocksize));
+	if (LINUX_S_ISDIR(inode->i_mode)) {
+		/* set the final dir entry to cover the whole block */
+		ext2fs_inline_data_finish_convert(fs, ino, blk_buf, backup_buf,
+						  inline_size);
+	} else {
+		memcpy(blk_buf, backup_buf, inline_size);
+	}
+
+	retval = ext2fs_write_dir_block4(fs, blk, blk_buf, 0, ino);
+	if (retval)
+		goto out2;
+	retval = ext2fs_write_inode_full(fs, ino, (void *)inode,
+					 EXT2_INODE_SIZE(fs->super));
+	if (retval)
+		goto out2;
+
+	if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) {
+		retval = ext2fs_extent_open2(fs, ino, (void *)inode, &handle);
+		if (retval)
+			goto out2;
+		retval = ext2fs_extent_set_bmap(handle, 0, blk, 0);
+		ext2fs_extent_free(handle);
+		if (retval)
+			goto out2;
+	}
+
+	ext2fs_block_alloc_stats2(fs, blk, +1);
+
+out2:
+	ext2fs_free_mem(&blk_buf);
+out1:
+	ext2fs_free_mem(&backup_buf);
+out:
+	ext2fs_free_mem(&inode);
+
+	if (retval) {
+		es->err = retval;
+	} else {
+		es->done = 1;
+		es->newblocks++;
+		es->goal = blk;
+	}
+	return retval;
+}
+
+errcode_t ext2fs_inline_data_create(ext2_filsys fs,
+				    struct ext2_inode_large *inode,
+				    unsigned int len)
+{
+	struct ext2_ext_attr_ibody_header *header;
+	struct ext2_ext_attr_search s = {
+		.not_found = ENODATA,
+	};
+	struct ext2_ext_attr_info i = {
+		.name_index = EXT4_EXT_ATTR_INDEX_SYSTEM,
+		.name = EXT4_EXT_ATTR_SYSTEM_DATA,
+	};
+	void *buf;
+	errcode_t retval;
+
+	if (len > EXT4_MIN_INLINE_DATA_SIZE) {
+		i.value = EXT2_ZERO_EXT_ATTR_VALUE;
+		i.value_len = len - EXT4_MIN_INLINE_DATA_SIZE;
+	} else {
+		i.value = "";
+		i.value_len = 0;
+	}
+
+	retval = ext2fs_ext_attr_ibody_find(fs, inode, &i, &s);
+	if (retval)
+		return retval;
+	retval = ext2fs_ext_attr_set_entry(&i, &s);
+	if (retval)
+		return retval;
+
+	header = IHDR(inode);
+	if (!EXT2_EXT_IS_LAST_ENTRY(s.first))
+		header->h_magic = EXT2_EXT_ATTR_MAGIC;
+	else
+		header->h_magic = 0;
+
+	return 0;
+}
diff --git a/lib/ext2fs/mkdir.c b/lib/ext2fs/mkdir.c
index 4a85439..a6aeb0d 100644
--- a/lib/ext2fs/mkdir.c
+++ b/lib/ext2fs/mkdir.c
@@ -36,11 +36,13 @@ errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
 {
 	ext2_extent_handle_t	handle;
 	errcode_t		retval;
-	struct ext2_inode	parent_inode, inode;
+	struct ext2_inode	parent_inode, *inode = NULL;
+	struct ext2_inode_large *large_inode = NULL;
 	ext2_ino_t		ino = inum;
 	ext2_ino_t		scratch_ino;
 	blk64_t			blk;
 	char			*block = 0;
+	int			inline_data = 0;
 
 	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
 
@@ -55,16 +57,38 @@ errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
 	}
 
 	/*
+	 * We try to create a new directory with inline data if this feature
+	 * is enabled.  Here we don't try to do this if ino < first_ino or
+	 * the directory name is 'lost+found'.
+	 */
+	if (fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_INLINE_DATA &&
+	    ino >= EXT2_FIRST_INO(fs->super) && strcmp("lost+found", name) != 0)
+		inline_data = 1;
+
+	/*
 	 * Allocate a data block for the directory
 	 */
-	retval = ext2fs_new_block2(fs, 0, 0, &blk);
+	if (!inline_data) {
+		retval = ext2fs_new_block2(fs, 0, 0, &blk);
+		if (retval)
+			goto cleanup;
+	}
+
+	/*
+	 * Allocate a new inode structuure
+	 */
+	retval = ext2fs_get_memzero(EXT2_INODE_SIZE(fs->super), &large_inode);
 	if (retval)
 		goto cleanup;
+	inode = (struct ext2_inode *) large_inode;
 
 	/*
 	 * Create a scratch template for the directory
 	 */
-	retval = ext2fs_new_dir_block(fs, ino, parent, &block);
+	if (inline_data)
+		retval = ext2fs_new_dir_inline_data(fs, ino, parent, inode);
+	else
+		retval = ext2fs_new_dir_block(fs, ino, parent, &block);
 	if (retval)
 		goto cleanup;
 
@@ -81,37 +105,61 @@ errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
 	/*
 	 * Create the inode structure....
 	 */
-	memset(&inode, 0, sizeof(struct ext2_inode));
-	inode.i_mode = LINUX_S_IFDIR | (0777 & ~fs->umask);
-	inode.i_uid = inode.i_gid = 0;
-	ext2fs_iblk_set(fs, &inode, 1);
-	if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS)
-		inode.i_flags |= EXT4_EXTENTS_FL;
+	inode->i_mode = LINUX_S_IFDIR | (0777 & ~fs->umask);
+	inode->i_uid = inode->i_gid = 0;
+	ext2fs_iblk_set(fs, inode, 1);
+	if (inline_data)
+		inode->i_flags |= EXT4_INLINE_DATA_FL;
+	else if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS)
+		inode->i_flags |= EXT4_EXTENTS_FL;
 	else
-		inode.i_block[0] = blk;
-	inode.i_links_count = 2;
-	inode.i_size = fs->blocksize;
+		inode->i_block[0] = blk;
+	inode->i_links_count = 2;
 
 	/*
 	 * Write out the inode and inode data block.  The inode generation
 	 * number is assigned by write_new_inode, which means that the call
 	 * to write_dir_block must come after that.
+	 *
+	 * If we try to create an new inode with inline data, we should call
+	 * ext2fs_write_inode_full to avoid to initialize extra part.
 	 */
-	retval = ext2fs_write_new_inode(fs, ino, &inode);
-	if (retval)
-		goto cleanup;
-	retval = ext2fs_write_dir_block4(fs, blk, block, 0, ino);
-	if (retval)
-		goto cleanup;
+	if (inline_data) {
+		__u32 t = fs->now ? fs->now : time(NULL);
+
+		inode->i_size = EXT4_MIN_INLINE_DATA_SIZE;
+		inode->i_blocks = 0;
+		if (!inode->i_ctime)
+			inode->i_ctime = t;
+		if (!inode->i_mtime)
+			inode->i_mtime = t;
+		if (!inode->i_atime)
+			inode->i_atime = t;
+		if (!large_inode->i_crtime)
+			large_inode->i_crtime = t;
+		retval = ext2fs_write_inode_full(fs, ino, inode,
+						 EXT2_INODE_SIZE(fs->super));
+		if (retval)
+			goto cleanup;
+	} else {
+		inode->i_size = fs->blocksize;
 
-	if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) {
-		retval = ext2fs_extent_open2(fs, ino, &inode, &handle);
+		retval = ext2fs_write_new_inode(fs, ino, inode);
 		if (retval)
 			goto cleanup;
-		retval = ext2fs_extent_set_bmap(handle, 0, blk, 0);
-		ext2fs_extent_free(handle);
+		retval = ext2fs_write_dir_block4(fs, blk, block, 0, ino);
 		if (retval)
 			goto cleanup;
+
+		if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) {
+			retval = ext2fs_extent_open2(fs, ino, inode, &handle);
+			if (retval)
+				goto cleanup;
+			retval = ext2fs_extent_set_bmap(handle, 0, blk, 0);
+			ext2fs_extent_free(handle);
+			if (retval)
+				goto cleanup;
+		}
 	}
 
 	/*
@@ -136,6 +184,10 @@ errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
 	 * Update parent inode's counts
 	 */
 	if (parent != ino) {
+		/* Reload parent inode due to inline data */
+		retval = ext2fs_read_inode(fs, parent, &parent_inode);
+		if (retval)
+			goto cleanup;
 		parent_inode.i_links_count++;
 		retval = ext2fs_write_inode(fs, parent, &parent_inode);
 		if (retval)
@@ -145,14 +197,16 @@ errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
 	/*
 	 * Update accounting....
 	 */
-	ext2fs_block_alloc_stats2(fs, blk, +1);
+	if (!inline_data)
+		ext2fs_block_alloc_stats2(fs, blk, +1);
 	ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
 
 cleanup:
+	if (large_inode)
+		ext2fs_free_mem(&large_inode);
 	if (block)
 		ext2fs_free_mem(&block);
 	return retval;
-
 }
 
 
diff --git a/lib/ext2fs/newdir.c b/lib/ext2fs/newdir.c
index 2cd541d..cec99e9 100644
--- a/lib/ext2fs/newdir.c
+++ b/lib/ext2fs/newdir.c
@@ -87,3 +87,36 @@ errcode_t ext2fs_new_dir_block(ext2_filsys fs, ext2_ino_t dir_ino,
 	*block = buf;
 	return 0;
 }
+
+/*
+ * Create new directory in inode
+ */
+errcode_t ext2fs_new_dir_inline_data(ext2_filsys fs,
+				     ext2_ino_t dir_ino,
+				     ext2_ino_t parent_ino,
+				     struct ext2_inode *inode)
+{
+	struct ext2_inode_large *large_inode;
+	struct ext2_dir_entry *dir = NULL;
+	int inline_size = EXT4_MIN_INLINE_DATA_SIZE;
+	errcode_t retval;
+
+	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+	large_inode = (struct ext2_inode_large *) inode;
+	large_inode->i_extra_isize = sizeof(struct ext2_inode_large) -
+		EXT2_GOOD_OLD_INODE_SIZE;
+	retval = ext2fs_inline_data_create(fs, large_inode, inline_size);
+	if (retval)
+		return retval;
+
+	dir = (struct ext2_dir_entry *) inode->i_block;
+	dir->inode = parent_ino;
+
+	dir = (struct ext2_dir_entry *) ((char *) dir +
+					 EXT4_INLINE_DATA_DOTDOT_SIZE);
+	dir->inode = 0;
+	dir->rec_len = inline_size - EXT4_INLINE_DATA_DOTDOT_SIZE;
+
+	return retval;
+}
-- 
1.7.9.7

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