Public bug reported: SRU Justification
Impact: Currently shiftfs limits the maximum size for fallocate() needlessly causing calls such as fallocate --length 2GB ./file to fail. This limitation is arbitrary since it's not caused by the underlay but rather by shiftfs itself capping the s_maxbytes. This causes bugs such as the one reported in https://github.com/lxc/lxd/issues/6333. Fix: Currectly set up s_maxbytes when creating the shiftfs superblock. Regression Potential: Limited to shiftfs. Test Case: Try fallocate --length 3GB ./file on top of a filesystem with fallocate support on a fixed kernel and see that the call succeeds and the file is of the expected size. Target Kernels: All LTS kernels with shiftfs support. ** Affects: linux (Ubuntu) Importance: Undecided Assignee: Christian Brauner (cbrauner) Status: In Progress ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Christian Brauner (cbrauner) ** Changed in: linux (Ubuntu) Status: New => In Progress -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1849482 Title: shiftfs: fix fallocate() Status in linux package in Ubuntu: In Progress Bug description: SRU Justification Impact: Currently shiftfs limits the maximum size for fallocate() needlessly causing calls such as fallocate --length 2GB ./file to fail. This limitation is arbitrary since it's not caused by the underlay but rather by shiftfs itself capping the s_maxbytes. This causes bugs such as the one reported in https://github.com/lxc/lxd/issues/6333. Fix: Currectly set up s_maxbytes when creating the shiftfs superblock. Regression Potential: Limited to shiftfs. Test Case: Try fallocate --length 3GB ./file on top of a filesystem with fallocate support on a fixed kernel and see that the call succeeds and the file is of the expected size. Target Kernels: All LTS kernels with shiftfs support. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1849482/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
