[Xen-devel] double or triple access to ext2, ext3 or other partitions

[Luke Kenneth Casson Leighton <lkcl@xxxxxxxx>]

dear xen developers,

how feasible would it be, in your opinions, to add in code into the
linux kernel / xen infrastructure, around the ext2 and ext3 filesystem
drivers, that meant, ultimately, that you could have TWO OR MORE
separate linux xen guest OSes mounting the SAME partition?

muhahahahah  oo sorry.

i would envisage this as being implemented somewhere along the following
lines:

1) provide some mutex semaphore system in the xen infrastructure which
one or more linux xen guest OS could "register" with and use

2) at every point in the ext2 and ext3 filesystem drivers where
SMP-driven locking is performed, add in xen-semaphore usage and locking
(as well / instead).

presumably, the issue of locking an ext2, ext3 or other
filesystem already covers the issue of SMP-based locking,
therefore i imagine it wouldn't be too hard to utilise that
opportunity to put in "alternative" locking.

l.

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