The patchset can be fetched from github: https://github.com/adam900710/btrfs-progs/tree/check_unaligned_dev There are several reports in mail list for btrfs device size related problems. 1) kernel refuse to mount some fs, due to mismatched super total_bytes Unmountable if super total_bytes is smaller than total rw bytes of all devices. Root cause seems to be that, at least for kernel v4.13, some device resize/add operation on unaligned device can lead to super size out of sync with device size. And normally this will cause super size to be 1 page (4096) smaller than all devices' size. This patchset provides the tool to fix it offline. (At least better than unmountable forever) 2) Harmless kernel warning for btrfs_update_device() v4.14 introduced restrict device size checker. This is causing harmless but annoying kernel warnning. It can be fixed online with "btrfs filesystem resize". This patchset also provide a fallback method to fix it. Finally, fix a typo which makes "btrfs rescue zero-log" to continue execution even the fs is mounted and error message outputted. Changelog: v2: Move the command line tool from "btrfs check" to "btrfs rescue", suggested by David. Although fsck can still repair/detect it. Function naming change for cmds-check.c part, suggested by Nikolay. Remove inaccurate kernel version, suggested by Nikolay. Fix a bug when coding in cmds-rescue.c. Split the first patch to make review easier. Qu Wenruo (6): btrfs-progs: Introduce function to fix unaligned device size btrfs-progs: Introduce function to fix super block total bytes btrfs-progs: rescue: Introduce fix-device-size btrfs-progs: check: Also check and repair unalignment/mismatch device and super size btrfs-progs: test/fsck: Add test case image for --fix-dev-size btrfs-progs: rescue: Fix zero-log mounted branch Documentation/btrfs-rescue.asciidoc | 29 ++++ cmds-check.c | 76 +++++++++ cmds-rescue.c | 49 ++++++ .../dev_and_super_mismatch_unaligned.raw.xz | Bin 0 -> 21536 bytes volumes.c | 178 +++++++++++++++++++++ volumes.h | 4 + 6 files changed, 336 insertions(+) create mode 100644 tests/fsck-tests/027-unaligned-super-dev-sizes/dev_and_super_mismatch_unaligned.raw.xz -- 2.14.2 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
