** Changed in: linux (Ubuntu)
Status: Confirmed => In Progress
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https://bugs.launchpad.net/bugs/1837223
Title:
shiftfs: add O_DIRECT support
Status in linux package in Ubuntu:
In Progress
Bug description:
SRU Justification
Impact: Currently shiftfs does not handle O_DIRECT if the underlay
supports it. This is blocking dqlite - an essential part of LXD - from
profiting from the performance benefits of O_DIRECT on suitable
filesystems when used with async io such as aio or io_uring.
Regression Potential: Limited to shiftfs and virtually none since we
have not supported this feature before.
Test Case: Run LXD with dqlite on a kernel that has support for
shiftfs with O_DIRECT.
Target Kernels: All LTS kernels with shiftfs support.
Patches:
https://github.com/brauner/ubuntu-disco/tree/shiftfs_direct_io
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