Walery Studennikov wrote:
> 1.
>
> Strange things happens when you try to upload file to
> ftp when the file with the same name already exists there.
> At first existing file (which must be overwritten)
> is DOWNLOADED to the local machine and only after that
> the local file is uploaded to ftp.
> So, WHY to download the remote file (increasing incomming traffic
> and wasting time) before owerwrite it?
> 2.
>
> Why when copying local files to ftp, those files are copied
> to /tmp at first and only after that they are copied to ftp.
> WHY do we do this unnecessary operation?
When file is opened there is no way to know, will the read() system call
used, because O_RDONLY is 0. So, for performance reasons VFS layer makes
local temporary copy of this file, and then all of data is read and
written from/to this copy. And this file is uploaded only in mc_close().
Possible solutions are:
1) get local copy on first read call only (Brr)
2) provide something like O_LINEAR flag (As far as I remember there were
some problems
with this options and Pavel Machek disabled this one.) Another
solution is an own
flag for mc_open, but we need to be sure it and its value are used
nowhere in known
Universe for open system call.
3) use directly vfs_s_data.file_store in copy_file_file/move_file_file
if destination is
not on local filesystem.
> 3.
>
> An ancient problem:
>
> Cannot chmod target file "/mnt/d/file.txt"
> Operation not permitted (1)
>
> Occures when copying to vfat filesystems, but not only.
> If we need to copy MANY files, we have to WASTE TIME
> and press OK many times.
> You can say "use cp -rf". Yes, but with "cp -rf"
> I can't use mc vfs.
>
> May be we will introduce a run-time option
> to disable whose annoying warnings?
> I mean to not disable them entirely,
> but just print those warnings on the hintbar.
>
> Also when we MOVE files and this warning occurs,
> the source file is not removed.
> Yes, it is wise in most cases, but maybe
> also provide an option to fix this?
>
>
You can unset "preserve Attributes" when copy.
In January, 2002, I sent a patch to enable this feature for Move operation.
Regards,
Andrew V. Samoilov.
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