** Also affects: linux (Ubuntu Eoan)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Eoan)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1884767
Title:
shiftfs: fix btrfs regression
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Eoan:
Fix Committed
Bug description:
SRU Justification
Impact: The patch
commit cfaa482afb97e3c05d020af80b897b061109d51f
Author: Christian Brauner <christian.brau...@ubuntu.com>
Date: Tue Apr 14 22:26:53 2020 +0200
UBUNTU: SAUCE: shiftfs: fix dentry revalidation
BugLink: https://bugs.launchpad.net/bugs/1872757
to fix https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1872757
regresses various btrfs + shiftfs users. Creating a btrfs subvolume,
deleting it, and then trying to recreate it will cause EEXIST to be returned.
It also leaves some files in a half-visible state because they are not
revalidated
correctly.
Faulty behavior such as this can be reproduced via:
btrfs subvolume create my-subvol
btrfs subvolume delete my-subvol
Fix: We need to revert this patch restoring the old behavior. This will
briefly
resurface https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1872757 which
I will fix in a follow-up patch on top of this revert. We basically split the
part that fixes https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1872757
out of the revert.
Regression Potential: Limited to shiftfs.
Test Case: Build a kernel with fix applied and run above reproducer.
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