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[UNIX]: Make the unix sysctl tables per-namespace

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This is the core.

 * add the ctl_table_header on the struct net;
 * make the unix_sysctl_register and _unregister clone the table;
 * moves calls to them into per-net init and exit callbacks;
 * move the .data pointer in the proper place.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2007-12-01 23:51:01 +11:00 • committed by David S. Miller
parent 1d430b913c
commit 1597fbc0fa
3 changed files with 31 additions and 8 deletions
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27
net/unix/sysctl_net_unix.c
View file

@ -32,16 +32,33 @@ static struct ctl_path unix_path[] = {
{ },
};
static struct ctl_table_header * unix_sysctl_header;
int unix_sysctl_register(struct net *net)
{
unix_sysctl_header = register_sysctl_paths(unix_path, unix_table);
return unix_sysctl_header == NULL ? -ENOMEM : 0;
struct ctl_table *table;
table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL);
if (table == NULL)
goto err_alloc;
table[0].data = &net->sysctl_unix_max_dgram_qlen;
net->unix_ctl = register_net_sysctl_table(net, unix_path, table);
if (net->unix_ctl == NULL)
goto err_reg;
return 0;
err_reg:
kfree(table);
err_alloc:
return -ENOMEM;
}
void unix_sysctl_unregister(struct net *net)
{
unregister_sysctl_table(unix_sysctl_header);
struct ctl_table *table;
table = net->unix_ctl->ctl_table_arg;
unregister_sysctl_table(net->unix_ctl);
kfree(table);
}