https://bugzilla.kernel.org/show_bug.cgi?id=213627 Bug ID: 213627 Summary: Fail to read block descriptors data of ext4 filesystem Product: File System Version: 2.5 Kernel Version: 5.3.x-5.4.x Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: high Priority: P1 Component: ext4 Assignee: fs_ext4@xxxxxxxxxxxxxxxxxxxx Reporter: nipunasri.eerapu@xxxxxxxxxxxx Regression: No Our product takes backup of filesystems (ext2/3/4,xfs,btrfs) after taking the snapshot of the volume. We have our own drivers for taking snapshot. After taking snapshot, we calculate block group count and group descriptors blocks in Block group0 (group zero). From group descriptors, we read block bitmap and inode bitmaps. All this was working well till 5.0.x kernels and from 5.3.x kernels, block bitmap and inode bitmap values are getting garbage. It doesnot happen all the time.Everytime after reboot, it works fine. Our driver simply bypasses read/write calls to system block driver, not sure why data is corrupted. Can you please help me what have been changed between 5.0.x and 5.3.x kernels regarding ext,block driver. We are not seeing this issue for xfs and btrfs filesystem. We are suspecting something might have changed in ext2/3/4 and block driver in 5.3.x kernels. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
