erofs-freebsd-out-tree/tests/TC065-vop-getpages-mmap.md

Test Case: mmap Through VOP_GETPAGES

Test ID: TC065-vop-getpages-mmap Category: VM Integration Priority: Critical

Objective

Verify page-fault-driven reads, EOF semantics, and private/shared mapping behavior for plain and compressed EROFS files.

Procedure

On separate fresh mounts of vfs/vfs-plain.erofs and vfs/vfs-lz4.erofs:

./mmap_fault /tmp/repo22-g3/mnt/pager.bin

Expected Results

Random and sequential mapped bytes match pread exactly; the partial EOF page is zero, the next full page produces the helper's expected child SIGBUS, writable MAP_SHARED is EACCES, MAP_PRIVATE COW succeeds, and O_RDWR is EROFS. The plain and LZ4 logical FNV hashes are identical. Direct read utilities are not acceptance evidence. Record dmesg and cleanup.