[$] The ongoing quest for atomic buffered writes

Date:
Mon, 02 Mar 2026 22:27:12 +0000

Description:
There are many applications that need to be able to write multi-block
chunks of data to disk with the assurance that the operation will either complete successfully or fail altogether that the write will not be
partially completed (or "torn"), in other words. For years, kernel
developers have worked on providing atomic writes as a way of satisfying
that need; see, for example, sessions from the Linux Storage, Filesystem, Memory Management, and BPF (LSFMM+BPF) Summit from 2023 , 2024 ,
and 2025 ( twice ). While atomic direct I/O is now supported by some filesystems, atomic buffered I/O still is not. Filling
that gap seems certain to be a 2026 LSFMM+BPF topic but, thanks to an early discussion, the shape of a solution might already be coming into focus.

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Link to news story:
https://lwn.net/Articles/1060063/


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