# parted code (3.3-1) from focal
---------
libparted/arch/linux.c:
.....
=> if (fsync (fd) < 0 || close (fd) < 0)
if (ped_exception_throw (
PED_EXCEPTION_WARNING,
PED_EXCEPTION_RETRY +
PED_EXCEPTION_IGNORE,
=> _("Error fsyncing/closing %s:
%s"),
name, strerror (errno))
== PED_EXCEPTION_RETRY)
goto retry;
}
}
free (name);
# FSYNC(2)
RETURN VALUE
On success, these system calls return zero. On error, -1 is returned,
and errno is set appropriately.
---------
so definitely fsync() fails returning "-1" on the next unused loop
device as oppose to any other unused loop device.
The question is why unused loop device fails on fsync() ONLY when it is
the next unused loop device after a system boot (losetup -f) ?
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https://bugs.launchpad.net/bugs/1856871
Title:
i/o error if next unused loop device is queried
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