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   源码介绍

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ZFS文件系统官方文档，由sun提供，目前最新的ZFS开发仍然未脱离该范畴。

Table of Contents
Introduction...........................................................................................................................5
Chapter One – Virtual Devices (vdevs), Vdev Labels, and Boot Block................................6
Section 1.1: Virtual Devices.............................................................................................6
Section 1.2: Vdev Labels.................................................................................................6
Section 1.2.1: Label Redundancy................................................................................7
Section 1.2.2: Transactional Two Staged Label Update..............................................7
Section 1.3: Vdev Technical Details.................................................................................8
Section 1.3.1: Blank Space...........................................................................................8
Section 1.3.2: Boot Block Header...............................................................................8
Section 1.3.3: Name-Value Pair List...........................................................................8
Section 1.3.4: The Uberblock.....................................................................................12
Section 1.4: Boot Block..................................................................................................14
Chapter Two: Block Pointers and Indirect Blocks...............................................................15
Section 2.1: DVA – Data Virtual Address....................................................................15
Section 2.2 : GRID.......................................................................................................16
Section 2.3: GANG.......................................................................................................16
Section 2.4: Checksum..................................................................................................17
Section 2.5: Compression.............................................................................................18
Section 2.6 : Block Size................................................................................................18
Section 2.7: Endian........................................................................................................19
Section 2.8: Type..........................................................................................................19
Section 2.9: Level.........................................................................................................20
Section 2.10: Fill............................................................................................................20
Section 2.11: Birth Transaction.....................................................................................21
Section 2.12: Padding...................................................................................................21
Chapter Three: Data Management Unit...............................................................................22
Section 3.1 : Objects.......................................................................................................22
Section 3.2: Object Sets..................................................................................................26
Chapter Four – DSL ...........................................................................................................29
Section 4.1 : DSL Infrastructure.....................................................................................29
Section 4.2: DSL Implementation Details.......................................................................31
Section 4.3: Dataset Internals.........................................................................................32
Section 4.4: DSL Directory Internals..............................................................................34
Chapter Five – ZAP..............................................................................................................37
Section 5.1: The Micro Zap............................................................................................38
Section 5.2: The Fat Zap.................................................................................................39
Section 5.2.1: zap_phys_t..........................................................................................39
Section 5.2.2: Pointer Table.......................................................................................41
Section 5.2.3: zap_leaf_phys_t...................................................................................41
Section 5.2.4 : zap_leaf_chunk...................................................................................43
Chapter Six – ZPL................................................................................................................45
Section 6.1: ZPL Filesystem Layout...............................................................................45
Section 6.2: Directories and Directory Traversal............................................................45
Section 6.3: ZFS Access Control Lists............................................................................47
3
Chapter Seven – ZFS Intent Log.......................................................................................51
Section 7.1: ZIL header...................................................................................................51
Section 7.2: ZIL blocks....................................................................................................52
Chapter Eight – ZVOL (ZFS volume).................................................................................55