linux-kernel - Re: [PATCH] ext4: deaccount delayed allocations at freeing inode in ext4_evict

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Message-ID: <427b6718-0893-0f0f-f5db-5ad45b949a09@yandex-team.ru>
Date:   Tue, 29 Oct 2019 10:20:34 +0300
From:   Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:     Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
        linux-kernel@...r.kernel.org
Cc:     Dmitry Monakhov <dmtrmonakhov@...dex-team.ru>,
        Eric Whitney <enwlinux@...il.com>
Subject: Re: [PATCH] ext4: deaccount delayed allocations at freeing inode in
 ext4_evict_inode()

On 29/10/2019 10.17, Konstantin Khlebnikov wrote:
> If inode->i_blocks is zero then ext4_evict_inode() skips ext4_truncate().
> Delayed allocation extents are freed later in ext4_clear_inode() but this
> happens when quota reference is already dropped. This leads to leak of
> reserved space in quota block, which disappears after umount-mount.
> 
> This seems broken for a long time but worked somehow until recent changes
> in delayed allocation.

FYI, perf cannot correctly parse related perf events without this:

https://lore.kernel.org/lkml/157228145325.7530.4974461761228678289.stgit@buzz/