Failed to create a partition #115
Description
Hi, hello
The following error was reported when I created the partition
failed to write 'change' to /sys/class/block/loop4p5/uevent: open /sys/fs/class/block/loop4p5/uevent: read-only file system
On the server
[root@192 loop0p5]# ll -l
total 0
-r--r--r-- 1 root root 4096 Apr 2 09:27 alignment_offset
-r--r--r-- 1 root root 4096 Apr 2 09:27 dev
-r--r--r-- 1 root root 4096 Apr 2 09:27 discard_alignment
drwxr-xr-x 2 root root 0 Apr 2 09:01 holders
-r--r--r-- 1 root root 4096 Apr 2 09:27 inflight
-r--r--r-- 1 root root 4096 Apr 2 09:27 partition
drwxr-xr-x 2 root root 0 Apr 2 09:01 power
-r--r--r-- 1 root root 4096 Apr 2 09:27 ro
-r--r--r-- 1 root root 4096 Apr 2 09:27 size
-r--r--r-- 1 root root 4096 Apr 2 09:27 start
-r--r--r-- 1 root root 4096 Apr 2 09:27 stat
lrwxrwxrwx 1 root root 0 Apr 2 09:01 subsystem -> ../../../../../class/block
drwxr-xr-x 2 root root 0 Apr 2 09:01 trace
-rw-r--r-- 1 root root 4096 Apr 2 09:01 uevent
[root@192 loop0p5]# cat uevent
MAJOR=259
MINOR=4
DEVNAME=loop0p5
DEVTYPE=partition
I found the following code
func genPartChangeUEvent(d disko.Disk, pSet disko.PartitionSet) error {
if isBlk, err := blockDeviceExists(d.Path); err != nil {
return err
} else if !isBlk {
return nil
}
for _, p := range pSet {
uePath := fmt.Sprintf("/sys/class/block/%s/uevent", GetPartitionKname(d.Name, p.Number))
if err := ioutil.WriteFile(uePath, []byte("change"), 0600); err != nil && os.IsNotExist(err) {
return fmt.Errorf("%s did not exist: %v", uePath, err)
} else if err != nil {
return fmt.Errorf("failed to write 'change' to %s: %v", uePath, err)
}
}
return nil
}
I wonder, why do I need to write this file