There are implementations available in most operating system including but This allowed an easier development of the ThirdĮxtended Filesystem (ext3) and the Fourth Extended Filesystem (ext4). One of its greatest achievement is theĪbility to extend the file system functionalities while maintaining the Of the Extended Filesystem, it was first released to the public on Januaryġ993 as part of the Linux kernel. Written by Remy Card, Theodore Ts'o and Stephen Tweedie as a major rewrite Indexed Directory Entry Count and Limit Structure 5.1. Indexed Directory Entry Structure (dx_entry) 4.7.
Defined Indexed Directory Hash Versions 4.6.
Sample Linked Directory Data Layout, 4KiB blocks 4.4. Sample Floppy Disk Layout, 1KiB blocks 3.2. i_atime EXT2_DIRTY_FL - Dirty EXT2_COMPRBLK_FL - Compressed Blocks EXT2_NOCOMPR_FL - Access Raw Compressed Data EXT2_ECOMPR_FL - Compression Error EXT2_BTREE_FL - B-Tree Format Directory EXT2_INDEX_FL - Hash Indexed Directory EXT2_IMAGIC_FL - EXT2_JOURNAL_DATA_FL - Journal File Data EXT2_RESERVED_FL - Reserved A. File Attributes Standard Attributes SUID, SGID and -rwxrwxrwx File Size Owner and Group Extended Attributes Extended Attribute Block Layout Extended Attribute Block Header Attribute Entry Header Behaviour Control Flags EXT2_SECRM_FL - Secure Deletion EXT2_UNRM_FL - Record for Undelete EXT2_COMPR_FL - Compressed File EXT2_SYNC_FL - Synchronous Updates EXT2_IMMUTABLE_FL - Immutable File EXT2_APPEND_FL - Append Only EXT2_NODUMP_FL - Do No Dump/Delete EXT2_NOATIME_FL - Do Not Update. Directory Structure Linked List Directory inode rec_len name_len file_type name Sample Directory Indexed Directory Format Indexed Directory Root Indexed Directory Entry Lookup Algorithm Insert Algorithm Splitting Key Collisions Hash Function Performance 5. Disk Organization Superblock s_inodes_count s_blocks_count s_r_blocks_count s_free_blocks_count s_free_inodes_count s_first_data_block s_log_block_size s_log_frag_size s_blocks_per_group s_frags_per_group s_inodes_per_group s_mtime s_wtime s_mnt_count s_max_mnt_count s_magic s_state s_errors s_minor_rev_level s_lastcheck s_checkinterval s_creator_os s_rev_level s_def_resuid s_def_resgid s_first_ino s_inode_size s_block_group_nr s_feature_compat s_feature_incompat s_feature_ro_compat s_uuid s_volume_name s_last_mounted s_algo_bitmap s_prealloc_blocks s_prealloc_dir_blocks s_journal_uuid s_journal_inum s_journal_dev s_last_orphan s_hash_seed s_def_hash_version s_default_mount_options s_first_meta_bg Block Group Descriptor Table bg_block_bitmap bg_inode_bitmap bg_inode_table bg_free_blocks_count bg_free_inodes_count bg_used_dirs_count bg_pad bg_reserved Block Bitmap Inode Bitmap Inode Table i_mode i_uid i_size i_atime i_ctime i_mtime i_dtime i_gid i_links_count i_blocks i_flags i_osd1 i_block i_generation i_file_acl i_dir_acl i_faddr Inode i_osd2 Structure Locating an Inode 4. Definitions Blocks Block Groups Directories Inodes Superblocks Symbolic Links 3.
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