Added /proc/<pid> filtering.

1 files changed, 35 insertions, 5 deletions

diff --git a/arch/um/fs/hppfs/hppfs_kern.c b/arch/um/fs/hppfs/hppfs_kern.c
index 5e86d80..481591e 100644
--- a/arch/um/fs/hppfs/hppfs_kern.c
+++ b/arch/um/fs/hppfs/hppfs_kern.c
@@ -8,6 +8,7 @@
 #include <linux/slab.h>
 #include <linux/list.h>
 #include <linux/kernel.h>
+#include <linux/ctype.h>
 #include <asm/uaccess.h>
 #include "os.h"
 
@@ -25,19 +26,40 @@ struct hppfs_private {
 
 #define HPPFS_SUPER_MAGIC 0xb00000ee
 
+static struct super_operations hppfs_sbops;
+
 static struct inode *get_inode(struct super_block *sb, struct dentry *dentry,
 			       int *error);
 
+static int is_pid(struct dentry *dentry)
+{
+	struct super_block *sb;
+	int i;
+
+	sb = dentry->d_sb;
+	if((sb->s_op != &hppfs_sbops) || (dentry->d_parent != sb->s_root))
+		return(0);
+
+	for(i = 0; i < dentry->d_name.len; i++){
+		if(!isdigit(dentry->d_name.name[i]))
+			return(0);
+	}
+	return(1);
+}
+
 static char *dentry_name(struct dentry *dentry, int extra)
 {
 	struct dentry *parent;
 	char *root, *name;
-	int len;
+	const char *seg_name;
+	int len, seg_len;
 
 	len = 0;
 	parent = dentry;
 	while(parent->d_parent != parent){
-		len += parent->d_name.len + 1;
+		if(is_pid(parent))
+			len += strlen("pid") + 1;
+		else len += parent->d_name.len + 1;
 		parent = parent->d_parent;
 	}
 	
@@ -49,10 +71,18 @@ static char *dentry_name(struct dentry *dentry, int extra)
 	name[len] = '\0';
 	parent = dentry;
 	while(parent->d_parent != parent){
-		len -= parent->d_name.len + 1;
+		if(is_pid(parent)){
+			seg_name = "pid";
+			seg_len = strlen("pid");
+		}
+		else {
+			seg_name = parent->d_name.name;
+			seg_len = parent->d_name.len;
+		}
+
+		len -= seg_len + 1;
 		name[len] = '/';
-		strncpy(&name[len + 1], parent->d_name.name, 
-			parent->d_name.len);
+		strncpy(&name[len + 1], seg_name, seg_len);
 		parent = parent->d_parent;
 	}
 	strncpy(name, root, strlen(root));