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selftests/mm: skip map_populate on weird filesystems

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It seems that 9pfs does not allow truncating unlinked files, Mark Brown
has noted that NFS may also behave this way.

It doesn't seem quite right to call this a "bug" but it's probably a
special enough case that it makes sense for the test to just SKIP if it
happens.

Link: https://lkml.kernel.org/r/20250311-mm-selftests-v4-7-dec210a658f5@google.com
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Brendan Jackman 2025-03-11 13:18:18 +00:00 committed by Andrew Morton
parent bf6d575e24
commit 571a4b62ed
1 changed files with 7 additions and 0 deletions
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7
tools/testing/selftests/mm/map_populate.c
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@ -87,6 +87,13 @@ int main(int argc, char **argv)
BUG_ON(!ftmp, "tmpfile()");
ret = ftruncate(fileno(ftmp), MMAP_SZ);
if (ret < 0 && errno == ENOENT) {
/*
* This probably means tmpfile() made a file on a filesystem
* that doesn't handle temporary files the way we want.
*/
ksft_exit_skip("ftruncate(fileno(tmpfile())) gave ENOENT, weird filesystem?\n");
}
BUG_ON(ret, "ftruncate()");
smap = mmap(0, MMAP_SZ, PROT_READ | PROT_WRITE,