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From: "Theodore Ts'o" <tytso@mit.edu>
To: Jan Kara <jack@suse.cz>
Cc: linux-ext4@vger.kernel.org
Subject: Re: [PATCH 3/5] ext4: Speedup ext4 orphan inode handling
Date: Fri, 13 Aug 2021 11:26:45 -0400	[thread overview]
Message-ID: <YRaPNaukNFEObAvJ@mit.edu> (raw)
In-Reply-To: <20210813123434.GB11955@quack2.suse.cz>

On Fri, Aug 13, 2021 at 02:34:34PM +0200, Jan Kara wrote:
> Actually, in the orphan list code, we leave the inode in the on-disk list
> but remove it from the in-memory list - see how
> list_del_init(&ei->i_orphan) is called very early in ext4_orphan_del(). The
> reason for this unconditional deletion is that if we do not remove the
> inode from the in-memory orphan list, the filesystem will complain and
> corrupt memory on unmount.
> 
> Also note that leaving inode in the on-disk orphan list actually does no
> serious harm. Because the orphan cleanup code just checks i_nlink and
> i_disksize and truncates inode down to current i_disksize and removes inode
> completely if i_nlink is 0. So even if an inode on the orphan list gets
> reused, orphan cleanup will just do nothing for it. So the worst problem
> that will likely happen is that on-disk orphan linked list becomes
> corrupted but there's no data loss AFAICT.
> 
> Is it clearer now or am I missing something?

Yes, you're right, I misread the code.  Thanks for clarifying.

Can you send the final spin of this patch set?  I think we're all set
for this patch series.

Reviewed-by: Theodore Ts'o <tytso@mit.edu>

						- Ted

  reply	other threads:[~2021-08-13 15:26 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-11 10:19 [PATCH 0/5 v5] ext4: Speedup orphan file handling Jan Kara
2021-08-11 10:19 ` [PATCH 1/5] ext4: Support for checksumming from journal triggers Jan Kara
2021-08-11 10:19 ` [PATCH 2/5] ext4: Move orphan inode handling into a separate file Jan Kara
2021-08-11 10:19 ` [PATCH 3/5] ext4: Speedup ext4 orphan inode handling Jan Kara
2021-08-12 15:01   ` Theodore Ts'o
2021-08-13 12:34     ` Jan Kara
2021-08-13 15:26       ` Theodore Ts'o [this message]
2021-08-16  9:23         ` Jan Kara
2021-08-11 10:19 ` [PATCH 4/5] ext4: Orphan file documentation Jan Kara
2021-08-12 15:02   ` Theodore Ts'o
2021-08-11 10:19 ` [PATCH 5/5] ext4: Improve scalability of ext4 orphan file handling Jan Kara
2021-08-11 18:19   ` kernel test robot
2021-08-12 12:59     ` Jan Kara
2021-08-12 16:48   ` Theodore Ts'o
  -- strict thread matches above, loose matches on Subject: below --
2021-08-16  9:57 [PATCH 0/5 v7] ext4: Speedup " Jan Kara
2021-08-16  9:57 ` [PATCH 3/5] ext4: Speedup ext4 orphan inode handling Jan Kara
2021-08-16  9:22 [PATCH 0/5 v6] ext4: Speedup orphan file handling Jan Kara
2021-08-16  9:23 ` [PATCH 3/5] ext4: Speedup ext4 orphan inode handling Jan Kara
2021-07-12 15:40 [PATCH 0/5 v4] ext4: Speedup orphan file handling Jan Kara
2021-07-12 15:40 ` [PATCH 3/5] ext4: Speedup ext4 orphan inode handling Jan Kara

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