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nbd: use g_slice_new() instead of a freelist 

Use GLib's efficient slice allocator instead of open-coding the request
freelist.  This patch simplifies the NBDRequest code.

Now we qemu_blockalign() the req->data buffer each time but the next
patch switches from a fixed size buffer to a dynamic size anyway.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2013-05-02 14:23:07 +02:00
parent 50522d969b
commit e1adb27a83
1 changed files with 6 additions and 17 deletions
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23
nbd.c
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@ -98,7 +98,6 @@ struct NBDExport {
off_t size;
uint32_t nbdflags;
QTAILQ_HEAD(, NBDClient) clients;
QSIMPLEQ_HEAD(, NBDRequest) requests;
QTAILQ_ENTRY(NBDExport) next;
};
@ -850,13 +849,8 @@ static NBDRequest *nbd_request_get(NBDClient *client)
assert(client->nb_requests <= MAX_NBD_REQUESTS - 1);
client->nb_requests++;
if (QSIMPLEQ_EMPTY(&exp->requests)) {
req = g_malloc0(sizeof(NBDRequest));
req->data = qemu_blockalign(exp->bs, NBD_BUFFER_SIZE);
} else {
req = QSIMPLEQ_FIRST(&exp->requests);
QSIMPLEQ_REMOVE_HEAD(&exp->requests, entry);
}
req = g_slice_new0(NBDRequest);
req->data = qemu_blockalign(exp->bs, NBD_BUFFER_SIZE);
nbd_client_get(client);
req->client = client;
return req;
@ -865,7 +859,10 @@ static NBDRequest *nbd_request_get(NBDClient *client)
static void nbd_request_put(NBDRequest *req)
{
NBDClient *client = req->client;
QSIMPLEQ_INSERT_HEAD(&client->exp->requests, req, entry);
qemu_vfree(req->data);
g_slice_free(NBDRequest, req);
if (client->nb_requests-- == MAX_NBD_REQUESTS) {
qemu_notify_event();
}
@ -877,7 +874,6 @@ NBDExport *nbd_export_new(BlockDriverState *bs, off_t dev_offset,
void (*close)(NBDExport *))
{
NBDExport *exp = g_malloc0(sizeof(NBDExport));
QSIMPLEQ_INIT(&exp->requests);
exp->refcount = 1;
QTAILQ_INIT(&exp->clients);
exp->bs = bs;
@ -953,13 +949,6 @@ void nbd_export_put(NBDExport *exp)
exp->close(exp);
}
while (!QSIMPLEQ_EMPTY(&exp->requests)) {
NBDRequest *first = QSIMPLEQ_FIRST(&exp->requests);
QSIMPLEQ_REMOVE_HEAD(&exp->requests, entry);
qemu_vfree(first->data);
g_free(first);
}
g_free(exp);
}
}