On 2017年10月10日 16:15, Nikolay Borisov wrote:
On 10.10.2017 10:51, Qu Wenruo wrote:
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) Unmountable fs, due to mismatched super total_bytes
Unmountable if super total_bytes is smaller than total rw bytes of
all devices.
Root cause under investigation, but only one report here.
Don't you mean mountable? We've internally seen mounting being a problem
due to said size mismatch.
I mean the fs is unable to be mounted.
(Which is the correct single word to express "unable to be mounted"?)
The direct cause is obvious, strict super block total_bytes checker.
But I don't know how it happened.
Maybe there is a window between some kernel release make it out of sync,
but anyway, your introduced alignment enhancement commit should handle
them well in v4.14.
At least for worst case, such users with fs unable to mount, won't be
left in cold wind.
And new users starting from v4.13 should not hit such problems.
Thanks,
Qu
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 somewhat break the backward compatibility and causing kernel
warning.
It can be fixed online with "btrfs filesystem resize".
(Although it is better to fixed it at mount time)
This patchset also provide a fallback method to fix it.
Qu Wenruo (4):
btrfs-progs: Introduce functions to repair unaligned/mismatch device
size
btrfs-progs: fsck: Introduce --fix-dev-size option
btrfs-progs: check: Also check unalignment/mismatch device and super
size
btrfs-progs: test/fsck: Add test case image for --fix-dev-size
Qu Wenruo (4):
btrfs-progs: Introduce functions to repair unaligned/mismatch device
size
btrfs-progs: fsck: Introduce --fix-dev-size option
btrfs-progs: check: Also check unalignment/mismatch device and super
size
btrfs-progs: test/fsck: Add test case image for --fix-dev-size
Documentation/btrfs-check.asciidoc | 23 ++
cmds-check.c | 292 ++++++++++++++++++++-
.../dev_and_super_mismatch_unaligned.raw.xz | Bin 0 -> 21536 bytes
3 files changed, 314 insertions(+), 1 deletion(-)
create mode 100644
tests/fsck-tests/027-unaligned-super-dev-sizes/dev_and_super_mismatch_unaligned.raw.xz
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