KIO slaves: fuse moutned remote filesystems treated as local filesystems.

David Faure faure at
Mon Oct 27 22:50:13 GMT 2014

On Monday 22 September 2014 08:34:48 Euan Thoms wrote:
> My question refers to KDE4 specifically, but may be relevant to KDE5 also.
> I'm using WebDAV for our corporate roll-out via davfs2 (fuse module for
> WebDAV). In Dolphin the browsing can be very slow because of 2 things:
> (i) the size column gets populated with number of items within (e.g.
> recursive listing). (ii) the use of mime magic to determine file type means
> that with davfs, the whole file is downloaded in order to read the first 10
> bytes or so. For a 100MB file, this is extremely inefficient.
> Krusader has options that's allows you to turn off mim magic (and rely on
> file extensions alone), and it doesn't inspect the contents of sub-folders.
> The net result is much faster browsing through a davfs2 mounted
> filesystems.
> However, Dolphin and KIO in general, is well integrated into KDE. Therefore
> I would like to firstly; hack kdelibs in 4.10.5 for my corporate rollout.

> Secondly; perhaps have an option in future versions of KDE4 /5 to disable
> these clever but inefficient features of KIO.
> I noticed that when connecting to WebDAV using the webdav:// KIO slave, the
> folder size is replaced with "unknown". So how would I go about making the
> file:// KIO slave behave the same way?
> I am browsing throught the kio code, however it is very so[phisticated and
> therefore complex codebase. So I would appreciate if someone would point me
> in the right direction.

In 6369b556ae9beef6888699d23b91326bac950ba4 (which you have in 4.10.5),
(followed by ee3823dea680f), icon name became a delayed operation, to help 
with slow mounts.

ChildCountRole in KDirModel doesn't do that, hence the problem you're seeing.

Solution: ideally, this should be done delayed too.
For instance by moving the feature to KFileItem so that it's also done delayed 
when m_delayedMimeTypes is true.

Problem (ii) is solved (well improved) in Qt5 where "magic determination"
only reads the first 16 KB of the file.

David Faure, faure at,
Working on KDE Frameworks 5

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