Xi Ruoyao 3b39822a82 misc: Add support for Linux uio.h RWF_DONTCACHE flag ...

Linux 6.14 adds the new flag for uncached buffered IO on a filesystem
supporting it.

This caused two test failures as these tests expected the flag
0x00000080 is unused.  Add the flag definition to fix these tests on
Linux >= 6.14:

    FAIL: misc/tst-preadvwritev2
    FAIL: misc/tst-preadvwritev64v2

The test failures were not detected in routine test suite runs because
normally we create the test file in /tmp, where a tmpfs is usually
mounted, and tmpfs does not support this flag.  But it can be reproduced
with TMPDIR set to some directory in an ext4 file system.

Link: https://git.kernel.org/torvalds/c/af6505e5745b
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

2025-09-08 08:22:20 -03:00

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