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NFS: handle NFS caches dentries by network namespace aware routines 

This patch makes NFS caches PipeFS dentries allocated and destroyed in network
namespace context by PipeFS network namespace aware routines.

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 17:12:56 +03:00 committed by Trond Myklebust
parent 9222b95506
commit 5c1cacb175
3 changed files with 39 additions and 13 deletions
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42
fs/nfs/cache_lib.c
View File

@ -13,6 +13,7 @@
#include <linux/slab.h>
#include <linux/sunrpc/cache.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
#include <net/net_namespace.h>
#include "cache_lib.h"
@ -111,20 +112,34 @@ int nfs_cache_wait_for_upcall(struct nfs_cache_defer_req *dreq)
return 0;
}
int nfs_cache_register(struct cache_detail *cd)
static int nfs_cache_register_sb(struct super_block *sb, struct cache_detail *cd)
{
int ret;
struct dentry *dir;
dir = rpc_d_lookup_sb(sb, "cache");
BUG_ON(dir == NULL);
ret = sunrpc_cache_register_pipefs(dir, cd->name, 0600, cd);
dput(dir);
return ret;
}
int nfs_cache_register_net(struct net *net, struct cache_detail *cd)
{
struct vfsmount *mnt;
struct path path;
struct super_block *pipefs_sb;
int ret;
mnt = rpc_get_mount();
if (IS_ERR(mnt))
return PTR_ERR(mnt);
ret = vfs_path_lookup(mnt->mnt_root, mnt, "/cache", 0, &path);
if (ret)
pipefs_sb = rpc_get_sb_net(net);
if (!pipefs_sb) {
ret = -ENOENT;
goto err;
ret = sunrpc_cache_register_pipefs(path.dentry, cd->name, 0600, cd);
path_put(&path);
}
ret = nfs_cache_register_sb(pipefs_sb, cd);
rpc_put_sb_net(net);
if (!ret)
return ret;
err:
@ -132,10 +147,21 @@ err:
return ret;
}
void nfs_cache_unregister(struct cache_detail *cd)
static void nfs_cache_unregister_sb(struct super_block *sb, struct cache_detail *cd)
{
if (cd->u.pipefs.dir)
sunrpc_cache_unregister_pipefs(cd);
sunrpc_destroy_cache_detail(cd);
}
void nfs_cache_unregister_net(struct net *net, struct cache_detail *cd)
{
struct super_block *pipefs_sb;
pipefs_sb = rpc_get_sb_net(net);
if (pipefs_sb) {
nfs_cache_unregister_sb(pipefs_sb, cd);
rpc_put_sb_net(net);
}
rpc_put_mount();
}

4
fs/nfs/cache_lib.h
View File

@ -25,5 +25,5 @@ extern int nfs_cache_wait_for_upcall(struct nfs_cache_defer_req *dreq);
extern void nfs_cache_init(struct cache_detail *cd);
extern void nfs_cache_destroy(struct cache_detail *cd);
extern int nfs_cache_register(struct cache_detail *cd);
extern void nfs_cache_unregister(struct cache_detail *cd);
extern int nfs_cache_register_net(struct net *net, struct cache_detail *cd);
extern void nfs_cache_unregister_net(struct net *net, struct cache_detail *cd);

4
fs/nfs/dns_resolve.c
View File

@ -364,7 +364,7 @@ int nfs_dns_resolver_init(void)
int err;
nfs_cache_init(&nfs_dns_resolve);
err = nfs_cache_register(&nfs_dns_resolve);
err = nfs_cache_register_net(&init_net, &nfs_dns_resolve);
if (err) {
nfs_cache_destroy(&nfs_dns_resolve);
return err;
@ -374,7 +374,7 @@ int nfs_dns_resolver_init(void)
void nfs_dns_resolver_destroy(void)
{
nfs_cache_unregister(&nfs_dns_resolve);
nfs_cache_unregister_net(&init_net, &nfs_dns_resolve);
nfs_cache_destroy(&nfs_dns_resolve);
}