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Phoronix0 Hot0 comments2 min read
Linux 7.3 Looks Like It Will Upstream FailFS
FailFS is a new minimal pseudo-filesystem expected to be upstreamed in Linux 7.3. Unlike NULLFS (which returns ENOENT for all lookups), FailFS returns EOPNOTSUPP for every operation. It is mounted once during early boot via kern_mount(), belongs to no mount namespace, cannot be cloned or mounted from userspace, and nothing can be mounted on top of it. Its primary purpose is to allow tasks to completely shed their filesystem state — processes rooted in FailFS must use explicit file descriptors for all path lookups, as absolute paths and AT_FDCWD-relative lookups will fail. A follow-up will expose it via a new FD_FAILFS_ROOT sentinel and fchroot() syscall. The driver itself is under 200 lines of code.
Source: https://www.phoronix.com/news/Linux-7.3-Expects-FailFS. 8sync News only summarizes and links out; content copyright belongs to the authors and original sources.
