While working on LBS we've come accross some existing issues, some of them deal existing kernels without LBS, while the only new corner case specific to LBS is the xarray bug Willy fixed to help with truncation to larger order folios and races with writeback. This adds 3 new test to help reproduce these issues right away. One test reproduces an otherwise extremely difficult to reproduce deadlock, we have one patch fix already merged to help with that deadlock, however the test also also gives us more homework todo, as more deadlocks are still possible with that test even on v6.10-rc2. The mmap page boundary test let's us discover that a patch on the LBS series fixes the mmap page boundary restriction when huge pages are enabled on tmpfs. This is a corner case POSIX semantic issue, so likley not critical to most users. The fsstress + compaction test reproduces a really difficult to reproduce hang which is possible without some recent fixes, however the test reveals there is yet more work is left to do. The stress truncation + writeback test is the only test in this series specific to LBS, but likely will be useful later for other future uses in the kernel. Luis Chamberlain (5): common: move mread() to generic helper _mread() fstests: add mmap page boundary tests fstests: add fsstress + compaction test _require_debugfs(): simplify and fix for debian fstests: add stress truncation + writeback test common/rc | 54 +++++++++- tests/generic/574 | 36 +------ tests/generic/749 | 238 ++++++++++++++++++++++++++++++++++++++++++ tests/generic/749.out | 2 + tests/generic/750 | 62 +++++++++++ tests/generic/750.out | 2 + tests/generic/751 | 127 ++++++++++++++++++++++ tests/generic/751.out | 2 + 8 files changed, 490 insertions(+), 33 deletions(-) create mode 100755 tests/generic/749 create mode 100644 tests/generic/749.out create mode 100755 tests/generic/750 create mode 100644 tests/generic/750.out create mode 100755 tests/generic/751 create mode 100644 tests/generic/751.out -- 2.43.0
