[PATCH v5 0/2] fstests: test reads/writes from hugepages-backed buffers

[Joanne Koong <joannelkoong@gmail.com>]

There was a recent bug in rc1 [1] that was due to faulty handling for
userspace buffers backed by hugepages.

This patchset adds generic tests for reads/writes from buffers backed by
hugepages.

[1] https://lore.kernel.org/linux-fsdevel/p3iss6hssbvtdutnwmuddvdadubrhfkdoosgmbewvo674f7f3y@cwnwffjqltzw/

Changelog:
v4: 
https://lore.kernel.org/linux-fsdevel/20250118004759.2772065-1-joannelkoong@gmail.com/
- Fix identationand and if logic structure for collapses (Darrick)

v3:
https://lore.kernel.org/linux-fsdevel/20250115183107.3124743-1-joannelkoong@gmail.com/
- Gate '-h' text behind MADVISE_COLLAPSE (Darrick)
- Add periodic hugepages collapsing for memory constrained environments (Darrick)
- Use tabs instead of spaces (Darrick)
- Refactor #ifdef MADVISE_COLLAPSE placements

v2:
https://lore.kernel.org/linux-fsdevel/20241227193311.1799626-1-joannelkoong@gmail.com/
- Gate -h and MADV_COLLAPSE usage to get it compatible on old systems (Zorro)
- Use calloc instead of malloc/memset (Nirjhar)
- Update exit codes in 1st patch
- Add Brian's reviewed-bys

v1:
https://lore.kernel.org/linux-fsdevel/20241218210122.3809198-1-joannelkoong@gmail.com/
- Refactor out buffer initialization (Brian)
- Update commit messages of 1st patch (Brian)
- Use << 10 instead of * 1024 (Nirjhar)
- Replace CONFIG_TRANSPARENT_HUGEPAGE check with checking
  'sys/kernel/mm/transparent_hugepage/' (Darrick)
- Integrate readbdy and writebdy options 
- Update options of generic/759 to include psize/bsize

Joanne Koong (2):
  fsx: support reads/writes from buffers backed by hugepages
  generic: add tests for read/writes from hugepages-backed buffers

 common/rc             |  13 ++++
 ltp/fsx.c             | 166 ++++++++++++++++++++++++++++++++++++++----
 tests/generic/758     |  22 ++++++
 tests/generic/758.out |   4 +
 tests/generic/759     |  26 +++++++
 tests/generic/759.out |   4 +
 6 files changed, 222 insertions(+), 13 deletions(-)
 create mode 100755 tests/generic/758
 create mode 100644 tests/generic/758.out
 create mode 100755 tests/generic/759
 create mode 100644 tests/generic/759.out

-- 
2.47.1