On 03/29/10 12:43 AM, Darren Reed wrote:
> On 03/28/10 12:12, Tim Haley wrote:
>> I am sponsoring the following fast-track on behalf of myself. This
>> case introduces a new zfs sub-command for describing differences
>> between snapshots in a zfs hierarchy. A delegated permission and
>> read-only system attribute are also introduced to support the
>> sub-command. The case requests micro/patch binding.
>>
>> Template Version: @(#)sac_nextcase 1.69 02/15/10 SMI
>> This information is Copyright 2010 Sun Microsystems
>> 1. Introduction
>> 1.1. Project/Component Working Name:
>> zfs diff
>> 1.2. Name of Document Author/Supplier:
>> Author: Tim Haley
>> 1.3 Date of This Document:
>> 28 March, 2010
>>
>> 4. Technical Description
>>
>> There is a long-standing RFE for zfs to be able to describe
>> what has changed between the snapshots of a dataset.
>> To provide this capability, we propose a new 'zfs diff'
>> sub-command. When run with appropriate privilege the
>> sub-command describes what file system level changes have
>> occurred between the requested snapshots. A diff between the
>> current version of the file system and one of its snapshots is
>> also supported.
>>
>> Five types of change are described:
>>
>> o File/Directory modified
>> o File/Directory present in older snapshot but not newer
>> o File/Directory present in newer snapshot but not older
>> o File/Directory renamed
>> o File link count changed
>>
>> Diffs can be performed if the user is delegated the "diff"
>> permission. The "diff" permission is being introduced by this
>> case. Diffs can also be performed without the "diff"
>> permission, if the user has appropriate privilege. For diffs
>> between existing snapshots, the necessary privilege is
>> {PRIV_SYS_CONFIG}. For diff between the current file system
>> and a snapshot {PRIV_SYS_MOUNT} is also necessary.
>>
>> Also introduced by this case is a system attribute on zfs files
>> called 'generation'. This attribute is part of the
>> XATTR_VIEW_READONLY described in PSARC 2007/315. It is
>> generated automatically by the ZFS module.
>
> Does "zfs diff" work between different versions of zfs filesystems?
> If so, what are the restrictions?
>Yes. No restrictions. -tim
