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NFS: DNS resolver cache per network namespace context introduced

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This patch implements DNS resolver cache creation and registration for each
alive network namespace context.
This was done by registering NFS per-net operations, responsible for DNS cache
allocation/register and unregister/destructioning instead of initialization and
destruction of static "nfs_dns_resolve" cache detail (this one was removed).
Pointer to network dns resolver cache is stored in new per-net "nfs_net"
structure.
This patch also changes nfs_dns_resolve_name() function prototype (and it's
calls) by adding network pointer parameter, which is used to get proper DNS
resolver cache pointer for do_cache_lookup_wait() call.

Note: empty nfs_dns_resolver_init() and nfs_dns_resolver_destroy() functions
will be used in next patch in the series.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Stanislav Kinsbursky
2011-11-25 17:13:04 +03:00
committed by Trond Myklebust
parent 5c1cacb175
commit 1b340d0118
5 changed files with 123 additions and 41 deletions
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33
fs/nfs/inode.c
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@ -51,6 +51,7 @@
#include "fscache.h"
#include "dns_resolve.h"
#include "pnfs.h"
#include "netns.h"
#define NFSDBG_FACILITY NFSDBG_VFS
@ -1552,6 +1553,25 @@ static void nfsiod_stop(void)
destroy_workqueue(wq);
}
int nfs_net_id;
static int nfs_net_init(struct net *net)
{
return nfs_dns_resolver_cache_init(net);
}
static void nfs_net_exit(struct net *net)
{
nfs_dns_resolver_cache_destroy(net);
}
static struct pernet_operations nfs_net_ops = {
.init = nfs_net_init,
.exit = nfs_net_exit,
.id = &nfs_net_id,
.size = sizeof(struct nfs_net),
};
/*
* Initialize NFS
*/
@ -1561,9 +1581,13 @@ static int __init init_nfs_fs(void)
err = nfs_idmap_init();
if (err < 0)
goto out9;
goto out10;
err = nfs_dns_resolver_init();
if (err < 0)
goto out9;
err = register_pernet_subsys(&nfs_net_ops);
if (err < 0)
goto out8;
@ -1625,10 +1649,12 @@ out5:
out6:
nfs_fscache_unregister();
out7:
nfs_dns_resolver_destroy();
unregister_pernet_subsys(&nfs_net_ops);
out8:
nfs_idmap_quit();
nfs_dns_resolver_destroy();
out9:
nfs_idmap_quit();
out10:
return err;
}
@ -1640,6 +1666,7 @@ static void __exit exit_nfs_fs(void)
nfs_destroy_inodecache();
nfs_destroy_nfspagecache();
nfs_fscache_unregister();
unregister_pernet_subsys(&nfs_net_ops);
nfs_dns_resolver_destroy();
nfs_idmap_quit();
#ifdef CONFIG_PROC_FS