[PATCH blktests 0/3] blktests: tests for the direct I/O fallback, splice, and bio trimming fixes

[Tal Zussman <tz2294@columbia.edu>]

Three regression tests for block device fixes under review [1],
following block/048 for the first patch of that series.

block/049 races partial O_DIRECT writes, which finish through the
direct I/O write fallback, against BLKBSZSET. block/050 does the same
with splice(). Both need CONFIG_DEBUG_VM to report the folio order
mismatch, and skip on kernels without a 64K block size or with 64K
pages.

block/051 issues trimmed O_DIRECT writes from a hugetlb mapping to a
device with a 64K logical block size and checks that no huge pages
leak, covering both the dropped and the shrunk bvec.

[1] https://lore.kernel.org/linux-block/20260828-blkdev-fixes-v2-0-32f3f40cebed@columbia.edu/

---
Tal Zussman (3):
      block/049: add a direct I/O write fallback race test for block devices
      block/050: add a splice read race test for block devices
      block/051: add a pinned page leak test for trimmed direct writes

 src/.gitignore          |   3 +
 src/Makefile            |   9 +-
 src/bio-trim-pin-leak.c | 191 ++++++++++++++++++++++++++++++++++++++++
 src/dio-fallback-race.c | 229 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/splice-race.c       | 171 ++++++++++++++++++++++++++++++++++++
 tests/block/049         |  57 ++++++++++++
 tests/block/049.out     |   2 +
 tests/block/050         |  54 ++++++++++++
 tests/block/050.out     |   2 +
 tests/block/051         |  64 ++++++++++++++
 tests/block/051.out     |   2 +
 11 files changed, 783 insertions(+), 1 deletion(-)
---
base-commit: 94aea0684058ffcc91e6de9c2fc85fedf1342a39
change-id: 20260909-blkdev-fixes-tests-670f566f5f85

Best regards,
--  
Tal Zussman <tz2294@columbia.edu>