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From: Allison Henderson <allison.henderson@oracle.com>
To: Dave Chinner <david@fromorbit.com>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH v24 03/11] xfs: Set up infrastructure for log atrribute replay
Date: Tue, 31 Aug 2021 22:34:05 -0700	[thread overview]
Message-ID: <a16d362d-9353-e3dd-b05d-89483faca8b4@oracle.com> (raw)
In-Reply-To: <20210831215234.GU3657114@dread.disaster.area>



On 8/31/21 2:52 PM, Dave Chinner wrote:
> On Tue, Aug 24, 2021 at 03:44:26PM -0700, Allison Henderson wrote:
>> Currently attributes are modified directly across one or more
>> transactions. But they are not logged or replayed in the event of an
>> error. The goal of log attr replay is to enable logging and replaying
>> of attribute operations using the existing delayed operations
>> infrastructure.  This will later enable the attributes to become part of
>> larger multi part operations that also must first be recorded to the
>> log.  This is mostly of interest in the scheme of parent pointers which
>> would need to maintain an attribute containing parent inode information
>> any time an inode is moved, created, or removed.  Parent pointers would
>> then be of interest to any feature that would need to quickly derive an
>> inode path from the mount point. Online scrub, nfs lookups and fs grow
>> or shrink operations are all features that could take advantage of this.
>>
>> This patch adds two new log item types for setting or removing
>> attributes as deferred operations.  The xfs_attri_log_item will log an
>> intent to set or remove an attribute.  The corresponding
>> xfs_attrd_log_item holds a reference to the xfs_attri_log_item and is
>> freed once the transaction is done.  Both log items use a generic
>> xfs_attr_log_format structure that contains the attribute name, value,
>> flags, inode, and an op_flag that indicates if the operations is a set
>> or remove.
>>
>> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
>> ---
>>   fs/xfs/Makefile                 |   1 +
>>   fs/xfs/libxfs/xfs_attr.c        |   5 +-
>>   fs/xfs/libxfs/xfs_attr.h        |  31 +++
>>   fs/xfs/libxfs/xfs_defer.h       |   2 +
>>   fs/xfs/libxfs/xfs_log_format.h  |  44 +++-
>>   fs/xfs/libxfs/xfs_log_recover.h |   2 +
>>   fs/xfs/scrub/common.c           |   2 +
>>   fs/xfs/xfs_attr_item.c          | 453 ++++++++++++++++++++++++++++++++
> 
> Comment on the overall structure of this file now I've been trying
> to navigate through it for a little while. It is structured like:
> 
> <some attri stuff>
> <some attrd stuff>
> static const struct xfs_item_ops xfs_attrd_item_ops = {...}
> <some more attri stuff>
> static const struct xfs_item_ops xfs_attri_item_ops = {...}
> <some attri log recovery stuff>
> <some attrd log recovery stuff>
> 
> IOWs, the attri and attrd functions are interleaved non-obvious
> ways and that makes it hard to navigate around when trying to find
> related information. It would make more sense to me to structure
> this as:
> 
> <attri stuff>
> <attri log recovery stuff>
> <some attrd stuff>
> <attrd log recovery stuff>
> static const struct xfs_item_ops xfs_attri_item_ops = {...}
> const struct xlog_recover_item_ops xlog_attri_item_ops = {...}
> static const struct xfs_item_ops xfs_attrd_item_ops = {...}
> const struct xlog_recover_item_ops xlog_attrd_item_ops = {...}
> 
> because then all the related functionality is grouped together. It
> also puts all the ops structures together in the one place, so we
> don't have to jump around all over the file when just looking at
> what ops the items run at different times...
> 
Sure, will make a note to re-arrange some of these in the next version

Allison

> Cheers,
> 
> Dave.
> 

  reply	other threads:[~2021-09-01  5:34 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24 22:44 [PATCH v24 00/11] Log Attribute Replay Allison Henderson
2021-08-24 22:44 ` [PATCH v24 01/11] xfs: Return from xfs_attr_set_iter if there are no more rmtblks to process Allison Henderson
2021-08-24 22:44 ` [PATCH v24 02/11] xfs: Capture buffers for delayed ops Allison Henderson
2021-08-27 11:33   ` Chandan Babu R
2021-08-31 18:03     ` Allison Henderson
2021-08-30 17:44   ` Darrick J. Wong
2021-08-31 17:50     ` Allison Henderson
2021-09-18  0:02       ` Darrick J. Wong
2021-08-24 22:44 ` [PATCH v24 03/11] xfs: Set up infrastructure for log atrribute replay Allison Henderson
2021-08-27 14:17   ` Chandan Babu R
2021-08-31 18:03     ` Allison Henderson
2021-08-31  0:48   ` Dave Chinner
2021-08-31 19:03     ` Allison Henderson
2021-08-31 21:52   ` Dave Chinner
2021-09-01  5:34     ` Allison Henderson [this message]
2021-08-24 22:44 ` [PATCH v24 04/11] xfs: Implement attr logging and replay Allison Henderson
2021-08-30  7:47   ` Chandan Babu R
2021-08-31 18:11     ` Allison Henderson
2021-08-24 22:44 ` [PATCH v24 05/11] RFC xfs: Skip flip flags for delayed attrs Allison Henderson
2021-08-30 10:15   ` Chandan Babu R
2021-08-31 18:11     ` Allison Henderson
2021-08-24 22:44 ` [PATCH v24 06/11] xfs: Add xfs_attr_set_deferred and xfs_attr_remove_deferred Allison Henderson
2021-08-30 10:27   ` Chandan Babu R
2021-08-31 18:12     ` Allison Henderson
2021-09-01  3:47   ` Dave Chinner
2021-09-01  5:34     ` Allison Henderson
2021-08-24 22:44 ` [PATCH v24 07/11] xfs: Remove unused xfs_attr_*_args Allison Henderson
2021-08-24 22:44 ` [PATCH v24 08/11] xfs: Add log attribute error tag Allison Henderson
2021-08-24 22:44 ` [PATCH v24 09/11] xfs: Add larp debug option Allison Henderson
2021-08-30 12:03   ` Chandan Babu R
2021-08-31 18:12     ` Allison Henderson
2021-08-24 22:44 ` [PATCH v24 10/11] xfs: Merge xfs_delattr_context into xfs_attr_item Allison Henderson
2021-08-24 22:44 ` [PATCH v24 11/11] xfs: Add helper function xfs_attr_leaf_addname Allison Henderson
2021-08-30 14:17   ` Chandan Babu R
2021-08-31 18:13     ` Allison Henderson
2021-08-31  0:20 ` [PATCH v24 00/11] Log Attribute Replay Dave Chinner
2021-08-31 18:27   ` Allison Henderson
2021-09-01  6:29     ` Dave Chinner
2021-09-01  7:30 ` [PATCH 0/5] xfs: various logged attribute fixes Dave Chinner
2021-09-01  7:30   ` [PATCH 1/5] xfs: fix fallthrough annotations in xfs_attr_set_iter() Dave Chinner
2021-09-01  7:30   ` [PATCH 2/5] xfs: fix flags passed to kvmalloc() by xfs_attri_init() Dave Chinner
2021-09-01  7:30   ` [PATCH 3/5] xfs: hide log iovec alignment constraints Dave Chinner
2021-09-01  7:30   ` [PATCH 4/5] xfs: fix attribute log iovec sizing Dave Chinner
2021-09-01  7:30   ` [PATCH 5/5] [RFC] xfs: don't commit the first deferred transaction without intents Dave Chinner
2021-09-01 21:43   ` [PATCH 0/5] xfs: various logged attribute fixes Allison Henderson

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