netfilter/x_tables: simplify ѕeq_file code

Just use the address family from the proc private data instead of copying
it into per-file data.

Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 11 insertions, 28 deletions

diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 71325fef647d..3704101af27f 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -1489,15 +1489,10 @@ void *xt_unregister_table(struct xt_table *table)
 EXPORT_SYMBOL_GPL(xt_unregister_table);
 
 #ifdef CONFIG_PROC_FS
-struct xt_names_priv {
-        struct seq_net_private p;
-        u_int8_t af;
-};
 static void *xt_table_seq_start(struct seq_file *seq, loff_t *pos)
 {
-        struct xt_names_priv *priv = seq->private;
         struct net *net = seq_file_net(seq);
-        u_int8_t af = priv->af;
+        u_int8_t af = (unsigned long)PDE_DATA(file_inode(seq->file));
 
         mutex_lock(&xt[af].mutex);
         return seq_list_start(&net->xt.tables[af], *pos);
@@ -1505,17 +1500,15 @@ static void *xt_table_seq_start(struct seq_file *seq, loff_t *pos)
 
 static void *xt_table_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
-        struct xt_names_priv *priv = seq->private;
         struct net *net = seq_file_net(seq);
-        u_int8_t af = priv->af;
+        u_int8_t af = (unsigned long)PDE_DATA(file_inode(seq->file));
 
         return seq_list_next(v, &net->xt.tables[af], pos);
 }
 
 static void xt_table_seq_stop(struct seq_file *seq, void *v)
 {
-        struct xt_names_priv *priv = seq->private;
-        u_int8_t af = priv->af;
+        u_int8_t af = (unsigned long)PDE_DATA(file_inode(seq->file));
 
         mutex_unlock(&xt[af].mutex);
 }
@@ -1538,16 +1531,8 @@ static const struct seq_operations xt_table_seq_ops = {
 
 static int xt_table_open(struct inode *inode, struct file *file)
 {
-        int ret;
-        struct xt_names_priv *priv;
-
-        ret = seq_open_net(inode, file, &xt_table_seq_ops,
-                           sizeof(struct xt_names_priv));
-        if (!ret) {
-                priv = ((struct seq_file *)file->private_data)->private;
-                priv->af = (unsigned long)PDE_DATA(inode);
-        }
-        return ret;
+        return seq_open_net(inode, file, &xt_table_seq_ops,
+                        sizeof(struct seq_net_private));
 }
 
 static const struct file_operations xt_table_ops = {
@@ -1563,7 +1548,7 @@ static const struct file_operations xt_table_ops = {
  */
 struct nf_mttg_trav {
         struct list_head *head, *curr;
-        uint8_t class, nfproto;
+        uint8_t class;
 };
 
 enum {
@@ -1580,6 +1565,7 @@ static void *xt_mttg_seq_next(struct seq_file *seq, void *v, loff_t *ppos,
                 [MTTG_TRAV_NFP_UNSPEC] = MTTG_TRAV_NFP_SPEC,
                 [MTTG_TRAV_NFP_SPEC]   = MTTG_TRAV_DONE,
         };
+        uint8_t nfproto = (unsigned long)PDE_DATA(file_inode(seq->file));
         struct nf_mttg_trav *trav = seq->private;
 
         switch (trav->class) {
@@ -1594,9 +1580,9 @@ static void *xt_mttg_seq_next(struct seq_file *seq, void *v, loff_t *ppos,
                 if (trav->curr != trav->head)
                         break;
                 mutex_unlock(&xt[NFPROTO_UNSPEC].mutex);
-                mutex_lock(&xt[trav->nfproto].mutex);
+                mutex_lock(&xt[nfproto].mutex);
                 trav->head = trav->curr = is_target ?
-                        &xt[trav->nfproto].target : &xt[trav->nfproto].match;
+                        &xt[nfproto].target : &xt[nfproto].match;
                 trav->class = next_class[trav->class];
                 break;
         case MTTG_TRAV_NFP_SPEC:
@@ -1628,6 +1614,7 @@ static void *xt_mttg_seq_start(struct seq_file *seq, loff_t *pos,
 
 static void xt_mttg_seq_stop(struct seq_file *seq, void *v)
 {
+        uint8_t nfproto = (unsigned long)PDE_DATA(file_inode(seq->file));
         struct nf_mttg_trav *trav = seq->private;
 
         switch (trav->class) {
@@ -1635,7 +1622,7 @@ static void xt_mttg_seq_stop(struct seq_file *seq, void *v)
                 mutex_unlock(&xt[NFPROTO_UNSPEC].mutex);
                 break;
         case MTTG_TRAV_NFP_SPEC:
-                mutex_unlock(&xt[trav->nfproto].mutex);
+                mutex_unlock(&xt[nfproto].mutex);
                 break;
         }
 }
@@ -1680,8 +1667,6 @@ static int xt_match_open(struct inode *inode, struct file *file)
         trav = __seq_open_private(file, &xt_match_seq_ops, sizeof(*trav));
         if (!trav)
                 return -ENOMEM;
-
-        trav->nfproto = (unsigned long)PDE_DATA(inode);
         return 0;
 }
 
@@ -1732,8 +1717,6 @@ static int xt_target_open(struct inode *inode, struct file *file)
         trav = __seq_open_private(file, &xt_target_seq_ops, sizeof(*trav));
         if (!trav)
                 return -ENOMEM;
-
-        trav->nfproto = (unsigned long)PDE_DATA(inode);
         return 0;
 }