Hi,

there are mainly core changes, refactoring and optimizations. Performance is improved in some areas, overall there may be a cumulative improvement due to refactoring that removed lookups in the IO path or simplified IO submission tracking.

No merge conflicts. Please pull, thanks.

Core:

• submit IO synchronously for fast checksums (crc32c and xxhash), remove high priority worker kthread

• read extent buffer in one go, simplify IO tracking, bio submission and locking

• remove additional tracking of redirtied extent buffers, originally added for zoned mode but actually not needed

• track ordered extent pointer in bio to avoid rbtree lookups during IO

• scrub, use recovered data stripes as cache to avoid unnecessary read

• in zoned mode, optimize logical to physical mappings of extents

• remove PageError handling, not set by VFS nor writeback

• cleanups, refactoring, better structure packing

• lots of error handling improvements

• more assertions, lockdep annotations

• print assertion failure with the exact line where it happens

• tracepoint updates

• more debugging prints

Performance:

• speedup in fsync(), better tracking of inode logged status can avoid transaction commit

• IO path structures track logical offsets in data structures and does not need to look it up

User visible changes:

• don’t commit transaction for every created subvolume, this can reduce time when many subvolumes are created in a batch

• print affected files when relocation fails

• trigger orphan file cleanup during START_SYNC ioctl

Notable fixes:

• fix crash when disabling quota and relocation

• fix crashes when removing roots from drity list

• fix transacion abort during relocation when converting from newer profiles not covered by fallback

• in zoned mode, stop reclaiming block groups if filesystem becomes read-only

• fix rare race condition in tree mod log rewind that can miss some btree node slots

• with enabled fsverity, drop up-to-date page bit in case the verification fails