| title: | Re PATCH 00 32 VFS based Union Mount V3 |
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On Tuesday 19 May 2009, Jan Blunck wrote:
So this means that the topmost branch always needs to be writable,
right? It isnt possible to make a union of two iso9660 filesystems,
for example?
Exactly. Although, you can do that with the help of tmpfs on top of the two
iso9660 filesystems.
But how do you get there? You can mount the tmpfs on top of two iso9660
file systems, but it seems that you wouldnt be able to get the two
stacked on top of each other in the first place.
Also, by mounting a tmpfs on top, wouldnt you you violate the requirement
for persistent inode numbers again?
Or by adding fake write support to iso9660 ...
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.
Arnd < <
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