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nfsd: containerize NFSd filesystem

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note: this backport is just for the null pointer problem when
start nfsd in none init netns. The nfsd is still not containerized.

commit 11f779421a upstream.

This patch makes NFSD file system superblock to be created per net.
This makes possible to get proper network namespace from superblock instead of
using hard-coded "init_net".

Note: NFSd fs super-block holds network namespace. This garantees, that
network namespace won't disappear from underneath of it.
This, obviously, means, that in case of kill of a container's "init" (which is not a mount
namespace, but network namespace creator) netowrk namespace won't be
destroyed.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
[wengmeiling: backport to 3.4:
 - export cache not per netns
 - NFSD service structure not per netns]
Signed-off-by: Weng Meiling <wengmeiling.weng@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stanislav Kinsbursky 2013-02-01 15:56:12 +03:00 committed by Greg Kroah-Hartman
parent fa16ac16fc
commit 6c14fee443
2 changed files with 24 additions and 8 deletions
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30
fs/nfsd/nfsctl.c
View file

@ -213,6 +213,7 @@ static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
struct sockaddr *sap = (struct sockaddr *)&address;
size_t salen = sizeof(address);
char *fo_path;
struct net *net = file->f_dentry->d_sb->s_fs_info;
/* sanity check */
if (size == 0)
@ -225,7 +226,7 @@ static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
if (qword_get(&buf, fo_path, size) < 0)
return -EINVAL;
if (rpc_pton(&init_net, fo_path, size, sap, salen) == 0)
if (rpc_pton(net, fo_path, size, sap, salen) == 0)
return -EINVAL;
return nlmsvc_unlock_all_by_ip(sap);
@ -389,7 +390,7 @@ static ssize_t write_threads(struct file *file, char *buf, size_t size)
{
char *mesg = buf;
int rv;
struct net *net = &init_net;
struct net *net = file->f_dentry->d_sb->s_fs_info;
if (size > 0) {
int newthreads;
@ -440,7 +441,7 @@ static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
int len;
int npools;
int *nthreads;
struct net *net = &init_net;
struct net *net = file->f_dentry->d_sb->s_fs_info;
mutex_lock(&nfsd_mutex);
npools = nfsd_nrpools();
@ -857,7 +858,7 @@ static ssize_t __write_ports(struct file *file, char *buf, size_t size,
static ssize_t write_ports(struct file *file, char *buf, size_t size)
{
ssize_t rv;
struct net *net = &init_net;
struct net *net = file->f_dentry->d_sb->s_fs_info;
mutex_lock(&nfsd_mutex);
rv = __write_ports(file, buf, size, net);
@ -1095,20 +1096,35 @@ static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
#endif
/* last one */ {""}
};
return simple_fill_super(sb, 0x6e667364, nfsd_files);
struct net *net = data;
int ret;
ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
if (ret)
return ret;
sb->s_fs_info = get_net(net);
return 0;
}
static struct dentry *nfsd_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
return mount_single(fs_type, flags, data, nfsd_fill_super);
return mount_ns(fs_type, flags, current->nsproxy->net_ns, nfsd_fill_super);
}
static void nfsd_umount(struct super_block *sb)
{
struct net *net = sb->s_fs_info;
kill_litter_super(sb);
put_net(net);
}
static struct file_system_type nfsd_fs_type = {
.owner = THIS_MODULE,
.name = "nfsd",
.mount = nfsd_mount,
.kill_sb = kill_litter_super,
.kill_sb = nfsd_umount,
};
#ifdef CONFIG_PROC_FS

2
fs/nfsd/nfssvc.c
View file

@ -670,7 +670,7 @@ int nfsd_pool_stats_open(struct inode *inode, struct file *file)
int nfsd_pool_stats_release(struct inode *inode, struct file *file)
{
int ret = seq_release(inode, file);
struct net *net = &init_net;
struct net *net = inode->i_sb->s_fs_info;
mutex_lock(&nfsd_mutex);
/* this function really, really should have been called svc_put() */