tree fadedcd0842fa60989078a4aa8c1959a27adbbd0
parent 75411d236d93d79d8052e0116c3eeebe23e2778b
author Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> 1291651681 +0000
committer Kevin Wolf <kwolf@redhat.com> 1292598664 +0100

qed: Table, L2 cache, and cluster functions

This patch adds code to look up data cluster offsets in the image via
the L1/L2 tables.  The L2 tables are writethrough cached in memory for
performance (each read/write requires a lookup so it is essential to
cache the tables).

With cluster lookup code in place it is possible to implement
bdrv_is_allocated() to query the number of contiguous
allocated/unallocated clusters.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>