This patchset can be fetched from my github:
https://github.com/Damenly/btrfs-progs/tree/lowmem
based on kdave/devel.
Thanks to Qu Wenruo's ideas and suggestions first.
Patch[1-3] fix minor problems of lowmem repair.
Patch[4-8] introduce two ways to avoid extents overwrite:
1) Traverse trees and exclude all metadata blocks.
It's time-inefficient for large filesystems.
2) Mark all existed chunks full, allocate new chunk for CoW and
records chunk start.
If the last allocated chunk is almost full, allocated a new one.
2) is More efficient than 1). However, it can't handle situations
like no space(fsck/004).
Lowmem repair will try method 2 first and then method 1.
Patch[9-17] remove parameters @trans in functions for lowmem repair.
They try to avoid extents overwrite if necessary and start
transactions by themselves.
Those patches are mainly for lowmem repair. Original mode is not
influenced.
---
Changlog:
v2->v3:
- check_btrfs_root() returns FATAL_ERROR if check_fs_first_inode()
failed. Thanks Nikolay Borisov.
- Add function try_to_force_cow_in_new_chunk() and global u64
varaiable to record start of the last allocated chunk.
- Remove unused EXTENTS_PIN in enum lowmem_extents_operation.
v1->v2:
- Let @err in check_btrfs_root() record err bits but excluded
negative values.
- Do not delete a line of code to release path after extent item'
insertion in repair_extent_data_item().
- Add patch[3].
- Force CoW in new allocated chunk to avoid extents overwrite.
- Remove parameters @trans in check_chunks_and_extents_v2() and
related callees.
- Repair functions for lowmem mode call try_avoid_extents_overwrite()
and start transactions.
Su Yue (17):
btrfs-progs: lowmem check: release path in repair_extent_data_item()
btrfs-progs: lowmem check: record returned errors after
walk_down_tree_v2()
btrfs-progs: lowmem check: assign @parent early in
repair_extent_data_item()
btrfs-progs: lowmem check: exclude extents of metadata blocks
btrfs-progs: lowmem check: introduce mark/clear_block_groups_full()
btrfs-progs: lowmem check: introduce force_cow_in_new_chunk()
btrfs-progs: lowmem check: introduce try_avoid_extents_overwrite()
btrfs-progs: lowmem check: exclude extents if init-extent-tree in
lowmem
btrfs-progs: lowmem check: start to remove parameters @trans in lowmem
btrfs-progs: lowmem check: remove parameter @trans of
delete_extent_item()
btrfs-progs: lowmem check: remove parameter @trans of
repair_chunk_item()
btrfs-progs: lowmem check: remove parameter @trans of
repair_extent_item()
btrfs-progs: lowmem check: remove parameter @trans of
check_leaf_items()
btrfs-progs: lowmem check: remove parameter @trans of
repair_tree_back_ref()
btrfs-progs: lowmem check: remove parameter @trans of
check_btrfs_root()
btrfs-progs: lowmem check: introduce repair_block_accounting()
btrfs-progs: lowmem check: end of removing parameters @trans in lowmem
cmds-check.c | 710 ++++++++++++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 604 insertions(+), 106 deletions(-)
--
2.15.1
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