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Work around architectures having statfs.f_type defined as long 

Having RAMFS_MAGIC defined as 0x858458f6 causing problems when trying
to compare it directly against statfs.f_type being cast from long to
unsigned long.

This hack is extremly ugly, but it should at least do the right thing
for every situation.

Thanks to Arnd Bergmann for suggesting the fix.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Jes Sorensen 2014-03-19 14:26:02 +01:00 committed by NeilBrown
parent fdcd157a80
commit 76d0f1886f
1 changed files with 5 additions and 1 deletions
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6
util.c
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@ -1946,9 +1946,13 @@ int in_initrd(void)
{
/* This is based on similar function in systemd. */
struct statfs s;
/* statfs.f_type is signed long on s390x and MIPS, causing all
sorts of sign extension problems with RAMFS_MAGIC being
defined as 0x858458f6 */
return statfs("/", &s) >= 0 &&
((unsigned long)s.f_type == TMPFS_MAGIC ||
(unsigned long)s.f_type == RAMFS_MAGIC);
((unsigned long)s.f_type & 0xFFFFFFFFUL) ==
((unsigned long)RAMFS_MAGIC & 0xFFFFFFFFUL));
}
void reopen_mddev(int mdfd)