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>
f04cd9dbc2