Add jbd2_journal_init_global() which initializes the JBD2 journal
subsystem caches. This wraps the existing journal_init() with a
static guard to ensure it's only called once.
Call this from ext4l_probe() when CONFIG_EXT4_JOURNAL is enabled
to initialize the journal subsystem before any journal operations.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Update ext4_uboot.h to include the new linux headers instead of
defining types locally. Remove duplicate definitions of:
- MAX_JIFFY_OFFSET (now in linux/jiffies.h)
- BDEVNAME_SIZE (now in linux/blkdev.h)
- rwlock_t (now in linux/spinlock.h)
Remove rwlock_init() stub from stub.c since it's now a macro.
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add a config option to control whether journal (jbd2) support is
included for ext4 filesystems. This defaults to y
Update fs/Makefile to conditionally include jbd2/ based on this
config instead of FS_EXT4L.
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Move ktime_t, sector_t, blkcnt_t, atomic_t, and atomic64_t to
linux/types.h to match Linux kernel header organisation.
Remove the duplicate definitions from linux/compat.h and
fs/ext4l/ext4_uboot.h since they are now in the canonical location.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add a minimal ext4l probe function that:
- Reads the superblock from the block device
- Validates the ext4 magic number
- Returns proper error codes (-EINVAL, -ENOMEM, -EIO)
Create include/ext4l.h header with function declarations and
documentation. Update fs_legacy.c to use the header.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Update fsmap.c to use ext4_uboot.h and add the required stubs:
- struct fsmap and related FMR_* macros
- trace_ext4_fsmap_* stub macros
- list_sort and sort stub macros
Cover-letter:
ext4l: Add jbd2 and remaining ext4l files to build
This series continues the ext4l port by adding the jbd2 journaling layer
and remaining ext4l files to the build.
Changes:
- Fix pr_emerg() macro to use log_emer()
- Import jbd2 source files from Linux 6.18
- Add jbd2 files to build: checkpoint, commit, journal, recovery,
revoke, transaction
- Add ext4l files to build: migrate, mmp, move_extent, resize, fsmap
Each file addition includes the necessary stubs in ext4_uboot.h and
removes redundant stubs from stub.c as real implementations become
available.
END
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add support for extent-moving for write operations.
Use ext4_uboot.h compatibility layer and add stubs for:
- down_write_nested - forwards to down_write
- filemap_release_folio, IS_SWAPFILE, PAGE_MASK
- lock_two_nondirectories, unlock_two_nondirectories
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add support for multi-mount protection.
Use ext4_uboot.h compatibility layer and add stubs for:
- init_utsname() - returns static node name "u-boot"
- sb_start_write/sb_end_write - no-op stubs
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add extent migration support for write operations.
Use the ext4_uboot.h compatibility layer instead of Linux headers.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add transaction.c to the jbd2 Makefile and update includes to use the
ext4l compatibility layer.
Add stubs for various functions needed by transaction.c including
atomic_add_return, prepare_to_wait_exclusive, rwsem_acquire_read,
hrtimer functions, and JBD2 trace stubs.
Remove JBD2 transaction function stubs that are now provided by
transaction.c.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add revoke.c to the jbd2 Makefile and update its includes to use the
compatibility layer.
Add stubs for hash_64 and __find_get_block_nonatomic()
Remove JBD2 revoke function stubs that are now provided by revoke.c.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add recovery.c to the jbd2 Makefile and update includes to use the ext4l
compatibility layer.
Add stubs for revoke.c functions that recovery.c depends on and tweak a
few so things build.
Fix sync_blockdev to return int instead of void.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add journal.c to the jbd2 Makefile and update includes to use the
ext4l compatibility layer.
Add stubs for functions from recovery.c, revoke.c, and transaction.c
that journal.c depends on.
Remove JBD2 function stubs from stub.c that are now provided by
journal.c.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Update checkpoint.c includes to use ext4_uboot.h compatibility layer.
Add jbd2/Makefile and include jbd2 in the build via fs/Makefile
Add necessary stubs and definitions:
- JBD2 trace stubs (trace_jbd2_checkpoint, etc.)
- mutex_lock_io, write_dirty_buffer, spin_needbreak stubs
- bd_dev field to struct block_device
- Temporary JBD2 function stubs until other jbd2 files are added
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add the JBD2 journaling layer core journal management from the
Linux 6.18 kernel ext4 filesystem driver.
journal.c handles:
- Journal initialisation and destruction
- Superblock management
- Journal thread (kjournald2) operations
- Block-mapping for journal storage
- Feature flag management
- Journal format versioning
- Fast-commit support infrastructure
This file provides the main journal_t structure management and
is the entry point for creating and destroying journals.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add the JBD2 journaling layer transaction management from the
Linux 6.18 kernel ext4 filesystem driver.
transaction.c handles:
- Transaction lifecycle (start, stop, restart)
- Handle management for filesystem operations
- Buffer attachment to transactions
- Transaction state machine
- Credit reservation and accounting
- Metadata and data buffer journaling
This is the core transaction API that ext4 uses to ensure
atomic updates to filesystem metadata.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add the JBD2 journaling layer recovery and commit functionality
from the Linux 6.18 kernel ext4 filesystem driver.
recovery.c handles:
- Journal recovery after unclean shutdown
- Transaction replay and verification
- Descriptor block parsing
- Revoke block processing
commit.c handles:
- Transaction commit processing
- Descriptor block writing
- Data and metadata buffer submission
- Checksum calculation for journal blocks
These files are needed for journal integrity and crash recovery in the
ext4 filesystem.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add the JBD2 journaling layer checkpoint and revoke functionality
from the Linux 6.18 kernel ext4 filesystem driver.
checkpoint.c handles:
- Log space management and checkpointing
- Buffer flushing and cleanup
- Transaction checkpoint processing
revoke.c handles:
- Block revocation for journal recovery
- Revoke record management
- Hash table for revoked blocks
These files are part of the JBD2 (Journaling Block Device 2) layer
that provides transaction support for ext4.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add the fast commit module (fast_commit.c) to the build. This implements
ext4's fast commit journaling feature for improved performance.
Stubs added for:
- Wait bit operations (DEFINE_WAIT_BIT, bit_waitqueue, etc.)
- Dentry name snapshot operations
- Fast commit trace functions
- JBD2 fast commit functions (jbd2_fc_get_buf, jbd2_fc_begin_commit, etc.)
- Dentry allocation (d_alloc, d_drop)
- get_current_ioprio, wake_up_bit
- REQ_IDLE, REQ_PREFLUSH block I/O flags
Move name_snapshot struct definition after qstr is defined.
Remove fast commit stub functions now implemented in fast_commit.c.
Series-to: concept
Cover-letter:
ext4l: Add more ext4 files to the build (part E)
This adds more files to the build. Most are fairly small but some still
require a fair few additions to ext4_uboot.h and the stub.c files.
At this point, we are close to having all the files in place, so can
move on to actually making ext4 work.
END
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add the page I/O module (page-io.c) to the build. This implements
ext4's asynchronous page writeback infrastructure.
Stubs added for:
- bio structure and related operations
- folio_iter for bio iteration
- refcount operations (mapped to atomic)
- fscrypt bounce folio operations
- folio writeback operations
- writeback control operations
- i_write_hint member to inode struct
Remove stub functions now implemented in page-io.c:
- ext4_io_submit_init, ext4_init_io_end
- ext4_io_submit, ext4_put_io_end_defer
- ext4_put_io_end, ext4_alloc_io_end_vec
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add the multiblock allocator (mballoc.c) to the build. This implements
the ext4 block allocation routines.
Stubs added for:
- Per-CPU operations (simplified to single-threaded)
- XArray operations
- RCU list operations
- Block device properties
- Various trace functions
- Atomic operations (atomic_sub, atomic64_sub, atomic_inc_return)
- WARN_RATELIMIT, folio_get, array_index_nospec
- seq_operations for procfs
- DEFINE_RAW_FLEX macro
Remove stub functions that are now properly implemented:
- ext4_mb_new_blocks
- ext4_free_blocks
- ext4_discard_preallocations
- ext4_mb_mark_bb
Add ext4_fc_replay_check_excluded stub for fast commit replay.
Add file member to struct seq_file for procfs compatibility.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add the ext4 inline data implementation file to the build.
Add stubs to ext4_uboot.h:
- FGP_WRITEBEGIN flag (combined from FGP_LOCK | FGP_WRITE | FGP_CREAT |
FGP_STABLE)
- kmap_local_folio, kunmap_local for memory mapping
- folio_zero_tail, folio_zero_segment for folio zeroing
- mapping_gfp_mask for address space GFP mask
Remove obsolete inline data stubs from stub.c that are now provided
by inline.c.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add symlink.c which provides symlink inode operations.
Changes needed:
- Add ext4_uboot.h include to symlink.c
- Add delayed_call struct and set_delayed_call macro
- Add kfree_link definition
- Add nd_terminate_link helper function
- Add get_link member to inode_operations struct
- Add simple_get_link function for fast symlinks
- Add i_link field to struct inode
- Add fscrypt_get_symlink and fscrypt_symlink_getattr stubs
- Add ext4_read_inline_link stub
- Remove ext4_symlink_inode_operations and
ext4_fast_symlink_inode_operations stubs from stub.c
Drop some duplicate declarations in ext4_uboot.h
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add file.c which provides file operations for ext4l filesystem.
Changes needed for file.c support:
- Add i_writecount and i_rwsem fields to struct inode
- Add IOMAP_DIO_* flags to linux/iomap.h
- Add vm_operations_struct definition
- Add VM flags (VM_SHARED, VM_HUGEPAGE, etc.)
- Add vm_area_desc and pipe_inode_info structures
- Add FMODE_* flags and SEEK_HOLE/SEEK_DATA to linux/fs.h
- Add vfsmount, path structs and f_path to struct file
- Add inode_trylock*, lockdep_assert_held_write macros
- Add filemap_fault, filemap_map_pages stubs
- Add inode_operations struct definition
- Add various stubs: d_path, fscrypt_file_open, fsverity_file_open,
dquot_file_open, sb_start_intwrite_trylock, ext4_listxattr
Simplify ext4_file_operations and ext4_file_inode_operations
initializers to use only the members defined in U-Boot's structs.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add super.c to the ext4l Makefile and provide the infrastructure
needed to compile it:
- Add stubs for block device operations (bdev_file_open_by_dev,
bdev_fput, bdev_getblk, submit_bh, trylock_buffer)
- Add stubs for NFS export helpers (generic_fh_to_dentry/parent)
- Add stubs for filesystem operations (sync_filesystem, dquot_suspend)
- Add stubs for string operations (strreplace, strtomem_pad)
- Add stubs for memory allocation (alloc_inode_sb, kvzalloc)
- Add stubs for ratelimit, workqueue, and trace functions
- Add fs_context and fs_parameter structures for mount options
- Add blk_holder_ops structure for block device holder operations
- Add pragma to suppress unused function/variable warnings
- Add __maybe_unused to __init/__exit macros in init.h
The only change to super.c itself is replacing the Linux kernel
includes with the U-Boot compatibility header ext4_uboot.h.
Series-to: concept
Cover-letter:
ext4l: Add more ext4 files to the build (part D)
This series continues the ext4l port by adding super.c to the build. The
super.c file contains the superblock operations and filesystem
registration code from the kernel's ext4 driver.
To support this effort compilation, this series adds numerous stubs and
compatibility shims for Linux kernel interfaces not available in
U-Boot, including block device operations, filesystem context
handling, NFS export helpers, and various utility functions.
In particular, fs/ext4l/ext4_uboot.h contains a lot of U-Boot specific
declarations and stubs, with fs/ext4l/stub.c containing various others.
The goal is to eventually have a fully functional ext4 implementation
ported from Linux that can be used for both reading and writing ext4
filesystems in U-Boot.
END
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add dir.c to the Makefile and provide necessary stubs:
- Replace Linux includes with ext4_uboot.h
- Add fscrypt directory operation stubs
- Add readahead, inode version, and dir_emit stubs
- Add struct file_operations with needed members
- Add generic_read_dir, ext4_llseek, ext4_htree_fill_tree stubs
- Add ext4_ioctl, ext4_sync_file, ext4_dirblock_csum_verify stubs
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add xattr_user.c and xattr_hurd.c to the ext4l build:
- Update includes to use ext4_uboot.h
- Add d_sb member to struct dentry
- Add XATTR_HURD_PREFIX to linux/xattr.h
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add xattr_trusted.c to the ext4l build with necessary changes:
- Update xattr_trusted.c includes to use ext4_uboot.h
- Add xattr.h include to ialloc.c for ext4_init_security
- Remove duplicate ext4_init_security declaration from ext4_uboot.h
(now provided by xattr.h inline stub)
- Add ext4_xattr_get and ext4_xattr_set stubs
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add orphan.c to the ext4l build and fix various build issues:
- Add atomic_inc/atomic_dec macros to ext4_uboot.h
- Add s_flags member to struct super_block and SB_RDONLY constant
- Add bdev_read_only() stub function
- Add kvfree() and kvmalloc_array() to linux/slab.h
- Add stub functions for orphan.c: ext4_reserve_inode_write,
ext4_superblock_csum_set, ext4_mark_iloc_dirty, ext4_truncate,
ext4_feature_set_ok, ext4_bread
- Fix orphan.c to use U-Boot include pattern
- Remove linux/atomic.h include from buffer_head.h (types provided
by ext4_uboot.h)
- Add kunit/static_stub.h and linux/nospec.h stub headers
- Simplify seq_file.h macros
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add stub declarations and implementations for xattr functions that
ialloc.c calls but which are defined in xattr.c (not yet compiled):
- __ext4_xattr_set_credits
- ext4_init_security
Add declarations to ext4_uboot.h and implementations to stub.c.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Mark variables as __maybe_unused where they are only used in macro
calls that expand to no-ops in U-Boot's single-threaded environment:
- tree in ext4_es_try_to_merge_left/right
- es_stats in ext4_seq_es_shrinker_info_show
- ei in ext4_clear_inode_es, ext4_remove_pending, ext4_is_pending
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add the extent status tree implementation to the ext4l build. This
module tracks extent status in memory to support delayed allocation
and SEEK_DATA/SEEK_HOLE operations.
Changes:
- Add extents_status.o to Makefile
- Add include guard to acl.h
- Add shrinker, ktime, and ratelimit stubs to ext4_uboot.h
- Guard iomap definitions in ext4_uboot.h when iomap.h is included
- Guard dquot macros when quotaops.h is included
- Remove stub functions now provided by extents_status.c
- Add ext4_da_release_space/update_reserve_space stubs
Series-to: u-boot
Cover-letter:
ext4l: Adjust some of the smaller files (part C)
This series makes various changes to allow some of the ext4l files to
compile successfully.
It provides a basic Kconfig to allow selecting ext4l (ext4 from Linu)
instead of the existing ext4 implementation.
To reduce the large number of include/linux files somewhat and to avoid
exceesive diffs against the Linux files, a new ext4_uboot.h header is
created. This will expand over time.
END
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add extents.c (extent handling) to the build and provide stubs.
Changes to extents.c:
- Replace Linux includes with ext4_uboot.h
Changes to ext4_uboot.h:
- Add __GFP_MOVABLE, __GFP_FS memory allocation flags
- Add FIEMAP_EXTENT_* flags for fiemap operations
- Add FALLOC_FL_* flags for fallocate operations
- Add O_SYNC flag and struct file with f_mapping
- Add struct iomap and iomap_ops for I/O mapping
- Add IOMAP_* type constants
- Add struct fiemap_extent_info and FIEMAP_FLAG_* constants
- Add i_blkbits member to inode struct
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add balloc.c (block allocation) to the build and provide stubs.
Changes to balloc.c:
- Replace Linux includes with ext4_uboot.h
Changes to mballoc.h:
- Replace Linux includes with ext4_uboot.h
Changes to ext4_uboot.h:
- Add REQ_META, REQ_PRIO, REQ_RAHEAD block I/O request flags
- Add CAP_SYS_ADMIN, CAP_SYS_RESOURCE capability stubs
- Add capable() stub that always returns true
- Add s_id member to super_block struct
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add ext4_jbd2.c to the build and provide the necessary stubs. To avoid
build warnings while we build out the required interfacing, start a new
stub.c file containing empty functions.
Changes to ext4_jbd2.c:
- Remove trace/events/ext4.h include (not needed)
- Stub out ext4_check_bdev_write_error() since U-Boot lacks async
I/O error tracking
- Add return after BUG() to silence non-void function warning
Changes to ext4_jbd2.h:
- Include ext4_uboot.h instead of linux/fs.h
Changes to ext4_uboot.h:
- Add sb_writers struct and SB_FREEZE constants
- Add _RET_IP_ macro
- Add mapping_large_folio_support() stub
- Add WARN_ON_ONCE/WARN_ON as proper stubs
- Add BUG(), might_sleep(), sb_rdonly() stubs
- Add trace function stubs
- Add buffer operation stubs (wait_on_buffer, mark_buffer_dirty, etc.)
- Add inode_needs_sync stub
- Include linux/sched.h for current task
Changes to include/linux/buffer_head.h:
- Add inline bh_*_bit functions for buffer state management
- Use bh_ prefixed functions in BUFFER_FNS/TAS_BUFFER_FNS macros
Changes to include/linux/fs.h:
- Add bd_disk to block_device struct
Changes to include/linux/workqueue.h:
- Fix flush_work macro to avoid unused value warning
Add stub functions to interface.c for jbd2 journal functions:
- jbd2__journal_start, jbd2_journal_stop
- jbd2_journal_free_reserved, jbd2_journal_start_reserved
- jbd2_journal_extend, jbd2_journal_get_write_access
- jbd2_journal_set_triggers, jbd2_journal_forget
- jbd2_journal_revoke, jbd2_journal_get_create_access
- jbd2_journal_dirty_metadata
- __ext4_error, __ext4_std_error, ext4_decode_error
Keep full Linux jbd2.h with compatibility header includes.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Move mutex definitions from compat.h to a dedicated mutex.h header,
matching the Linux structure.
U-Boot is single-threaded so mutexes are no-ops. The new header provides
struct mutex and mutex_init/lock/unlock stubs.
Update compat.h to include linux/mutex.h.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add hash.c to the ext4l build with required compatibility headers.
Create ext4_uboot.h with minimal definitions needed for hash.c:
- rol32() rotation function
- struct inode and super_block stubs
- struct qstr and dx_hash_info for directory hashing
- DX_HASH_* constants and EXT4_HTREE_EOF_32BIT
- fscrypt stub functions (encryption not supported)
- ext4_warning macros (stubbed out)
Modify hash.c to use ext4_uboot.h instead of Linux kernel headers.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Add the basic build infrastructure for the ext4l filesystem:
- Add FS_EXT4L Kconfig option in fs/ext4l/Kconfig
- Add ext4l to fs/Kconfig and fs/Makefile
- Add fstype_info entry in fs_legacy.c with unsupported stubs
- Add minimal interface.c with stub probe/close functions
This allows sandbox to build with CONFIG_FS_EXT4L=y. The filesystem
doesn't work yet - all operations return unsupported.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Create include/linux/module.h with stub definitions for kernel module
support. U-Boot doesn't use loadable modules, so these are no-ops.
Includes:
- THIS_MODULE, try_module_get(), module_put()
- module_init(), module_exit()
- module_param() and variants
- MODULE_* macros (LICENSE, AUTHOR, DESCRIPTION, etc.)
Update compat.h to include module.h and remove duplicate definitions.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Copy Kconfig and Makefile from Linux v6.18 fs/ext4 directory.
- Kconfig: configuration options for ext4
- Makefile: build rules
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
