[$] VFS write barriers

Date:
Wed, 23 Apr 2025 14:32:41 +0000

Description:
In the filesystem track at the 2025 Linux Storage, Filesystem, Memory Management, and BPF Summit (LSFMM+BPF), Amir Goldstein wanted to resume discussing
a feature that he had briefly introduced at the end of a 2023 summit session
: filesystem "write
barriers". The idea is to have an operation that would wait for any
in-flight write() system calls, but not block any new write() calls as bigger hammers, such as freezing the filesystem,
would do. His prototype implementation is used by a hierarchical
storage management (HSM) system to create a crash-consistent
change log, but there may be other use cases to consider. He wanted
to discuss implementation options and the possibility of providing an
API for user-space applications.

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Link to news story:
https://lwn.net/Articles/1017947/


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