[BUG]
Even "btrfs rescue zero-log" only reset btrfs_super_block::log_root and
btrfs_super_block::log_root_level, we still use trasction to write all
super blocks for all devices.
This means we can't handle things like corrupted extent tree:
checksum verify failed on 2172747776 found 000000B6 wanted 00000000
checksum verify failed on 2172747776 found 000000B6 wanted 00000000
bad tree block 2172747776, bytenr mismatch, want=2172747776, have=0
WARNING: could not setup extent tree, skipping it
Clearing log on /dev/nvme/btrfs, previous log_root 0, level 0
ERROR: Corrupted fs, no valid METADATA block group found
ERROR: attempt to start transaction over already running one
[CAUSE]
Because we have extra check in transaction code to ensure we have valid
METADATA block groups.
In fact we don't really need transaction at all.
[FIX]
Instead of commit transaction, we can just call write_all_supers()
manually, so we can still handle multi-device fs while avoid above
error.
Also, add OPEN_CTREE_NO_BLOCK_GROUPS open ctree flag to make it more
robust.
Link: https://lore.kernel.org/linux-btrfs/CAKbQEqG35D_=8raTFH75-yCYoqH2OvpPEmpj2dxgo+PTc=cfhA@mail.gmail.com/
Reported-by: Christian Pernegger <pernegger@gmail.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
For options that do not have the long description, the empty string is
required to mark where the options start. Some commands were missing
that.
Signed-off-by: David Sterba <dsterba@suse.com>
Qu Wenruo