linux-kernel - Re: [PATCH v2 0/4] power: wire-up filesystem freeze/thaw with suspend/resume

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Message-ID: <20250720192336.4778-1-safinaskar@zohomail.com>
Date: Sun, 20 Jul 2025 22:23:36 +0300
From: Askar Safin <safinaskar@...omail.com>
To: brauner@...nel.org
Cc: James.Bottomley@...senpartnership.com,
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Subject: Re: [PATCH v2 0/4] power: wire-up filesystem freeze/thaw with suspend/resume

Hi, Christian Brauner, Jan Kara and other contributors of this patchset.

I did experiments on my laptop, and these experiments show that this patchset does not solve various longstanding problems related to suspend and filesystems. (Even if I enable /sys/power/freeze_filesystems )

Now let me describe problems I had in the past (and still have!) and then experiments I did and their results.

So, I had these 3 problems:

- Suspend doesn't work if fstrim in progress (note that I use btrfs as root file system)

- Suspend doesn't work if scrub in progress

- Suspend doesn't work if we try to read from fuse-sshfs filesystem while network is down

Let me describe third problem in more detail. To reproduce you need to do this:

- Mount remote filesystem using sshfs (it is based on ssh and fuse)

- Disable internet

- Run command "ls" in that sshfs filesystem (this command will, of course, hang, because network is down)

- Then suspend

Suspend will not work.

Does your patchset supposed to fix these problems?

Okay, so just now I was able to reproduce all 3 problems on latest mainline ( f4a40a4282f467ec99745c6ba62cb84346e42139 ), which (as well as I understand) has this patchset applied.

I reproduced them with /sys/power/freeze_filesystems set to both 0 and 1 (thus I did 3 * 2 = 6 experiments).

I'm available for further testing.

--
Askar Safin