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authorStanislav Kinsbursky <skinsbursky@parallels.com>2013-02-01 15:56:12 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-06-11 12:04:19 -0700
commit6c14fee44389ab182ceab1df8fecbf2ffeb3a641 (patch)
treea695879ef32931c3cba7ead8c88bbe54647a87de
parentfa16ac16fc1dfe1ddca4b4c9ce71aea73a878402 (diff)
downloadlinux-linaro-stable-6c14fee44389ab182ceab1df8fecbf2ffeb3a641.tar.gz
nfsd: containerize NFSd filesystem
note: this backport is just for the null pointer problem when start nfsd in none init netns. The nfsd is still not containerized. commit 11f779421a39b86da8a523d97e5fd3477878d44f 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>
-rw-r--r--fs/nfsd/nfsctl.c30
-rw-r--r--fs/nfsd/nfssvc.c2
2 files changed, 24 insertions, 8 deletions
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 1d74af2566eb..cebc9efed525 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -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
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 5bc93803da3a..ed8eedfbdb63 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -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() */