Public bug reported:
SRU Justification
Impact: Currently, shiftfs maintains a kmem cache for struct
shiftfs_file_info which stashes away a struct path and the struct file
for the underlay. The path however is never used anywhere so the struct
shiftfs_file_info and therefore the whole kmem cache can go away. This
removes code and makes the whole logic simpler to understand and reason
about.
Fix: Remove the kmem cache for struct shiftfs_file_info and struct
shiftfs_file_info itself and move to the same model as overlayfs and
just stash away the struct file for the underlay in file->private_data
of the shiftfs struct file
Regression Potential: Limited to shiftfs. The basic logic is unchanged.
It is just simplified so regression potential should be fairly low.
Test Case: Tested with LXD on a kernel with the patch applied and
running various standard workloads without any observable regressions.
Target Kernels: All LTS kernels with support for shiftfs.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
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https://bugs.launchpad.net/bugs/1846265
Title:
shiftfs: rework how shiftfs opens files
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