nfsd: use proper net while reading "exports" file

Functuon "exports_open" is used for both "/proc/fs/nfs/exports" and
"/proc/fs/nfsd/exports" files.
Now NFSd filesystem is containerised, so proper net can be taken from
superblock for "/proc/fs/nfsd/exports" reader.
But for "/proc/fs/nfsd/exports" only current->nsproxy->net_ns can be used.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 25 insertions, 6 deletions

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index f6d448e6eb28..8ead2c25ce65 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -125,11 +125,11 @@ static const struct file_operations transaction_ops = {
         .llseek         = default_llseek,
 };
 
-static int exports_open(struct inode *inode, struct file *file)
+static int exports_net_open(struct net *net, struct file *file)
 {
         int err;
         struct seq_file *seq;
-        struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
+        struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
         err = seq_open(file, &nfs_exports_op);
         if (err)
@@ -140,8 +140,26 @@ static int exports_open(struct inode *inode, struct file *file)
         return 0;
 }
 
-static const struct file_operations exports_operations = {
-        .open           = exports_open,
+static int exports_proc_open(struct inode *inode, struct file *file)
+{
+        return exports_net_open(current->nsproxy->net_ns, file);
+}
+
+static const struct file_operations exports_proc_operations = {
+        .open           = exports_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release,
+        .owner          = THIS_MODULE,
+};
+
+static int exports_nfsd_open(struct inode *inode, struct file *file)
+{
+        return exports_net_open(inode->i_sb->s_fs_info, file);
+}
+
+static const struct file_operations exports_nfsd_operations = {
+        .open           = exports_nfsd_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
         .release        = seq_release,
@@ -1018,7 +1036,7 @@ static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 {
         static struct tree_descr nfsd_files[] = {
-                [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
+                [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
                 [NFSD_Export_features] = {"export_features",
                                         &export_features_operations, S_IRUGO},
                 [NFSD_FO_UnlockIP] = {"unlock_ip",
@@ -1081,7 +1099,8 @@ static int create_proc_exports_entry(void)
         entry = proc_mkdir("fs/nfs", NULL);
         if (!entry)
                 return -ENOMEM;
-        entry = proc_create("exports", 0, entry, &exports_operations);
+        entry = proc_create("exports", 0, entry,
+                                 &exports_proc_operations);
         if (!entry)
                 return -ENOMEM;
         return 0;