linux-ext4 - Re: [PATCH] ext4: compare inode's i_projid with EXT4_DEF_PROJID rather than check EXT4_INODE

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Message-ID: <Ya+3L3gBFCeWZki7@mit.edu>
Date:   Tue, 7 Dec 2021 14:34:07 -0500
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Roman Anufriev <dotdot@...dex-team.ru>
Cc:     linux-ext4@...r.kernel.org, jack@...e.cz, wshilong@....com,
        dmtrmonakhov@...dex-team.ru
Subject: Re: [PATCH] ext4: compare inode's i_projid with EXT4_DEF_PROJID
 rather than check EXT4_INODE_PROJINHERIT flag

On Tue, Dec 07, 2021 at 05:05:19PM +0300, Roman Anufriev wrote:
> > Commit 7ddf79a10395 ("ext4: only set project inherit bit for directory")
> > removes EXT4_INODE_PROJINHERIT flag from regular files. This makes
> > ext4_statfs() output incorrect (function does not apply quota limits
> > on used/available space, etc) when called on dentry of regular file
> > with project quota enabled.

Under what circumstance is userspace trying to call statfs on a file
descriptor?

Removing the test for EXT4_INODE_PROJINHERIT will cause
incorrect/misleading results being returned in the case where we have
a directory where a directory hierarchy is using project id's, but
which is *not* using PROJINHERIT.

				- Ted