[$] Freezing filesystems for suspend

Date:
Thu, 24 Apr 2025 14:08:07 +0000

Description:
Sometimes worms have a tendency to multiply once their can is opened.
James Bottomley recently encountered that situation; he led a session in
the filesystem track at the 2025 Linux Storage, Filesystem, Memory
Management, and BPF Summit (LSFMM+BPF) to discuss filesystem behavior with respect to suspending and resuming the system. As he noted in his topic proposal , he came at the problem because he needed a way to
resynchronize the contents of efivarfs after a system resume and thought
there should be an API available to use.
But, as the resulting thread shows, the filesystem freeze and thaw code had never been used by the system-wide suspend and resume code. Due to a scheduling mixup, though, several of us missed Bottomley's session,
including Luis Chamberlain who has been working on hooking those two pieces
up; what follows is largely from a second session that Chamberlain led,
with some background information from the topic-proposal discussion and an email exchange with Bottomley.

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Link to news story:
https://lwn.net/Articles/1018341/


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