zbookmark Struct Reference

A bookmark is a four-tuple <objset, object, level, blkid> that uniquely identifies any block in the pool. More...

#include <zio.h>

Data Fields
uint64_t	zb_objset
uint64_t	zb_object
int64_t	zb_level
uint64_t	zb_blkid

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Detailed Description

A bookmark is a four-tuple <objset, object, level, blkid> that uniquely identifies any block in the pool.

By convention, the meta-objset (MOS) is objset 0, and the meta-dnode is object 0. This covers all blocks except root blocks and ZIL blocks, which are defined as follows:

Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.

Note:

This structure is called a bookmark because its original purpose was to remember where to resume a pool-wide traverse.

This structure is passed between userland and the kernel. Therefore it must not change size or alignment between 32/64 bit compilation options.

Definition at line 252 of file zio.h.

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Field Documentation

uint64_t zbookmark::zb_blkid

Definition at line 256 of file zio.h.

int64_t zbookmark::zb_level

Definition at line 255 of file zio.h.

uint64_t zbookmark::zb_object

Definition at line 254 of file zio.h.

uint64_t zbookmark::zb_objset

Definition at line 253 of file zio.h.

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The documentation for this struct was generated from the following file:

• sys/zio.h