ext3/ext4 filesystems 1. ext3/ext4 Filesystems Kalpak Shah Clogeny Technologies Pvt. Ltd. 2. AGENGA Layout of EXT3/4 Essential on-disk data structures New features in ext4 • Extents, uninit_bg, nanosecond timestamps, 48- bit support, preallocation, mballoc, flex_bg, journal checksums • Its effects on on-disk layout Crash recovery Latest filesystem design layouts 3. Basic layout of EXT2/3