e2fsck: add support for dir_data feature

[tools/e2fsprogs.git] / lib / ext2fs / ext2fs.h

diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 722f8dc..5873341 100644 (file)
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -569,6 +569,7 @@ typedef struct ext2_icount *ext2_icount_t;
                                         EXT4_FEATURE_INCOMPAT_FLEX_BG|\
                                         EXT4_FEATURE_INCOMPAT_MMP|\
                                         EXT4_FEATURE_INCOMPAT_EA_INODE|\
+                                        EXT4_FEATURE_INCOMPAT_DIRDATA|\
                                         EXT4_FEATURE_INCOMPAT_64BIT)
 #else
 #define EXT2_LIB_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE|\
@@ -579,6 +580,7 @@ typedef struct ext2_icount *ext2_icount_t;
                                         EXT4_FEATURE_INCOMPAT_FLEX_BG|\
                                         EXT4_FEATURE_INCOMPAT_MMP|\
                                         EXT4_FEATURE_INCOMPAT_EA_INODE|\
+                                        EXT4_FEATURE_INCOMPAT_DIRDATA|\
                                         EXT4_FEATURE_INCOMPAT_64BIT)
 #endif
 #ifdef CONFIG_QUOTA
@@ -1701,6 +1703,25 @@ _INLINE_ blk_t ext2fs_inode_data_blocks(ext2_filsys fs,
        return ext2fs_inode_data_blocks2(fs, inode);
 }
 
+_INLINE_ struct ext2_dx_root_info *get_ext2_dx_root_info(ext2_filsys fs,
+                                                        char *buf)
+{
+       struct ext2_dir_entry_2 *de = (struct ext2_dir_entry_2 *)buf;
+
+       if (!(fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_DIRDATA))
+               return (struct ext2_dx_root_info *)(buf +
+                                                   __EXT2_DIR_REC_LEN(1) +
+                                                   __EXT2_DIR_REC_LEN(2));
+
+       /* get dotdot first */
+       de = (struct ext2_dir_entry_2 *)((char *)de + de->rec_len);
+
+       /* dx root info is after dotdot entry */
+       de = (struct ext2_dir_entry_2 *)((char *)de + EXT2_DIR_REC_LEN(de));
+
+       return (struct ext2_dx_root_info *)de;
+}
+
 /*
  * This is an efficient, overflow safe way of calculating ceil((1.0 * a) / b)
  */