due to systemd updated, sun8i kernel doesn't compact to new systemd.
after check systemd code, it return -EBADF in below code:
https://github.com/systemd/systemd/blob/master/src/basic/fs-util.c#L804-L815
fstat on path fds (open with O_PATH).
after check sun8i kernel code, in fstat path, fget_light rectly returns
NULL on path fds (file->f_mode & FMODE_PATH).
on mainline kernel, fget_light is wraper function of __fget_light.
on fstat path, it uses __fget_light, doesn't check FMODE_PATH.
so follow mainline kernel, change the behavior of sun8i kernel.
test case:
int main(int argc, char **argv)
{
int fd;
struct stat previous_stat;
fd = open("/", O_CLOEXEC|O_NOFOLLOW|O_PATH);
if (fd < 0) {
printf("%d, %s\n", __LINE__, strerror(errno));
return -errno;
}
if(fstat(fd, &previous_stat) < 0) {
printf("%d, %s\n", __LINE__, strerror(errno));
return -errno;
}
}
expect no error.
Signed-off-by: Zhang Ning <832666+zhangn1985@users.noreply.github.com>
Fix the same alignment bug as in arm64 - we need to pass residue
unprocessed bytes as the last argument to blkcipher_walk_done.
See https://patchwork.kernel.org/patch/4701551/ for details.
Now each master has 'w1_master_therm_convert_all' file. Its functionality is the
same as the 'w1_therm_convert_all' (located in '/sys/bus/w1'), but reading will start
temperature conversion on sensors connected to this master only.
Moved 'w1_convert_all' to bus node (now it's functionality implemented in the 'wire' module, w1.c file). It is the right place for it, also now it will work across multiple w1 masters.
Added new feature ( by Oleg Skydan <sov1178@gmail.com> ):
Reading the 'w1_therm_convert_all' file (located in '/sys/bus/w1') will start
temperature conversion on all sensors in the w1 net and wait 750ms to finish
conversion.
Then you can use the 'w1_read' on the slave devices (see modified w1_therm module) to
read converted temperatures. So you will not need to wait 750ms reading each sensor
(using 'w1_slave').
Added new features:
1. Read sensor memory without triggering temperature conversion. Just read 'w1_read'
file instead of usual 'w1_slave' file.
2. Ability to simultaneously trigger temperature conversion on all sensors in the network.
Reading the 'w1_convert_all' file on any temperature sensor in the w1 net will start
temperature conversion on all sensors in the w1 net.
So it is possible to greatly speed up sensors reading on the big 1wire nets by starting simultaneously temperature conversion on all sensors and then reading results from the sensors memory.
