Wednesday, May 3, 2017

Re: Strange behavior with x! and permissions

On 17/05/03 13:26, Gary Johnson wrote:
>On 2017-05-03, Christian Brabandt wrote:
>> Hi Gary!
>>
>> On Mi, 03 Mai 2017, Gary Johnson wrote:
>>
>> > > > If that was true, I would expect the inode number of the file to be
>> > > > different after Vim had edited it, but that is not what I observe.
>> > > > The inode number is unchanged.
>> > > >
>> > > > I created a file with only read permissions and successfully edited
>> > > > it with Vim. I repeated the experiment in a directory with only
>> > > > read and execute permissions and was able to edit that file as well.
>> > >
>> > > Did you check the backupcopy option?
>> >
>> > 'backupcopy' is set to "yes".
>>
>> Okay, so apparently it is not so easy (as usual).
>>
>> I made a little test:
>
>[...]
>
>> So it is clear, by removing a file with a lower inode number before
>> trying to write file2, that inode number of the deleted file file1 is
>> re-used when re-creating file2.
>>
>> So it looks like ext3/ext4 always uses the first free inode number for a
>> directory it can find and therefore, when deleting a file and
>> re-creating the file, it is possible that the same inode is re-used.
>>
>> Today I learned something new ;)
>
>So did I! Nice work. Thank you.

Thanks a lot :)

Niels

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