| title: | Re PATCH 00 32 VFS based Union Mount V3 |
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On Tuesday 19 May 2009, Jan Blunck wrote:
On Tue, May 19, Arnd Bergmann wrote:
This would work, but youd have to do this for each file system if you want
to be able to use it as the top of the union while backed by a read-only
block device or when you dont want it to be written.
I know that the requirement for the topmost filesystem to be able to create
directories and fill them with fallthrus is an unattractive one. On the other
hand this is the cost that you have to pay at the moment to get this kind of
functionality. This implementation will not help with all use-cases. Its focus
is to get certain use-cases right.
So what would go wrong if you only made them persistent for writable file
systems, but allowed fallthrough dentries to be discarded for read-only
file systems? As long as the lower layers dont change, you should still
be able to reconstruct the same dentries every time you do a readdir, right?
Arnd < <
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