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From: Daeho Jeong <daeho43@gmail.com>
To: Eric Biggers <ebiggers@kernel.org>
Cc: linux-kernel@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net, kernel-team@android.com,
	Daeho Jeong <daehojeong@google.com>
Subject: Re: [f2fs-dev] [PATCH] f2fs: fix race of pending_pages in decompression
Date: Fri, 4 Dec 2020 13:48:24 +0900	[thread overview]
Message-ID: <CACOAw_xzKjZcpVTo3aj5sJUQ_BjLr=5ZhnfuyFwYerpyzZu+aw@mail.gmail.com> (raw)
In-Reply-To: <CACOAw_y2HRE8CDk-HAjA6w_HzGJpRpivPY5zKRMC4_SNYTnTGg@mail.gmail.com>

Eric,

I have another question.
I understand enabling the verity can be possible in the middle of I/O.
Is the opposite way also possible? Actually, I couldn't find any
disabling function of it, though.

2020년 12월 4일 (금) 오후 1:31, Daeho Jeong <daeho43@gmail.com>님이 작성:
>
> > Are you sure?  I thought that compression (and encryption) apply to the whole
> > file, including any Merkle tree blocks past i_size.
>
> This "dic" structure is only for "de"compression, so we don't need to
> worry about going beyond i_size case.
>
> > Also, even if you include the i_size check, it's still wrong to check
> > fsverity_active() in the middle of the I/O because FS_IOC_ENABLE_VERITY can
> > execute concurrently, causing fsverity_active() to return false at the beginning
> > of the I/O and true later in the I/O.  It needs to be checked only once, at the
> > beginning...
>
> Got it. Our previous implementation didn't consider this case. Need to fix this.
>
> Thanks,

  reply	other threads:[~2020-12-04  4:49 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-04  0:58 Daeho Jeong
2020-12-04  3:28 ` [f2fs-dev] " Eric Biggers
2020-12-04  3:43   ` Daeho Jeong
2020-12-04  4:01     ` Eric Biggers
2020-12-04  4:31       ` Daeho Jeong
2020-12-04  4:48         ` Daeho Jeong [this message]
2020-12-04  4:51           ` Eric Biggers
2020-12-04  5:00             ` Daeho Jeong
2020-12-04  5:18               ` Eric Biggers
2020-12-04  7:01                 ` Daeho Jeong
2020-12-04 18:29                   ` Jaegeuk Kim
2020-12-05  3:40                     ` Daeho Jeong

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