298800cae7
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>
33 lines
694 B
C
33 lines
694 B
C
/*
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* QEMU Enhanced Disk Format
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#include "qed.h"
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void *gencb_alloc(size_t len, BlockDriverCompletionFunc *cb, void *opaque)
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{
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GenericCB *gencb = qemu_malloc(len);
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gencb->cb = cb;
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gencb->opaque = opaque;
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return gencb;
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}
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void gencb_complete(void *opaque, int ret)
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{
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GenericCB *gencb = opaque;
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BlockDriverCompletionFunc *cb = gencb->cb;
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void *user_opaque = gencb->opaque;
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qemu_free(gencb);
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cb(user_opaque, ret);
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}
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