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L4Linux: dimension block cache correctly (fix #426)

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In Genode's paravirtualized block driver a request cache is used to find again
Linux request structures via corresponding block-session packets. To work
correctly the cache needs to have at least the same size like the
block-session's queue-size.
This commit is contained in:
Stefan Kalkowski 2012-10-22 12:44:23 +02:00 committed by Norman Feske
parent b91c06feb7
commit a287831537
1 changed files with 6 additions and 9 deletions
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15
ports-foc/src/lib/l4lx/genode_block.cc
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@ -16,6 +16,7 @@
#include <base/allocator_avl.h>
#include <block_session/connection.h>
#include <os/config.h>
#include <util/assert.h>
#include <vcpu.h>
#include <linux.h>
@ -44,7 +45,7 @@ namespace {
};
enum { MAX = 128 };
enum { MAX = Block::Session::TX_QUEUE_SIZE };
Req_entry _cache[MAX];
@ -61,20 +62,16 @@ namespace {
void insert(void *packet, void *request)
{
int idx = _find(0);
if (idx < 0)
PERR("Req cache is full!");
else
_cache[idx] = Req_entry(packet, request);
ASSERT(idx >= 0, "Req cache full!");
_cache[idx] = Req_entry(packet, request);
}
void remove(void *packet, void **request)
{
int idx = _find(packet);
ASSERT(idx >= 0, "Req cache entry not found!");
if (idx < 0) {
*request = 0;
PERR("Req cache entry not found!");
}
*request = _cache[idx].req;
_cache[idx].pkt = 0;
_cache[idx].req = 0;