[Devel] [PATCH 6/9] allow proc_dir_entries to have destructor

[Andrey Savochkin]

Destructor field added proc_dir_entries,
standard destructor kfree'ing data introduced.

Signed-off-by: Andrey Savochkin <saw at swsoft.com>
---
 fs/proc/generic.c       |   10 ++++++++--
 fs/proc/root.c          |    1 +
 include/linux/proc_fs.h |    4 ++++
 3 files changed, 13 insertions(+), 2 deletions(-)

--- ./fs/proc/generic.c.veprocdtor	Mon Aug 14 16:43:41 2006
+++ ./fs/proc/generic.c	Tue Aug 15 13:45:51 2006
@@ -608,6 +608,11 @@ static struct proc_dir_entry *proc_creat
 	return ent;
 }
 
+void proc_data_destructor(struct proc_dir_entry *ent)
+{
+	kfree(ent->data);
+}
+
 struct proc_dir_entry *proc_symlink(const char *name,
 		struct proc_dir_entry *parent, const char *dest)
 {
@@ -620,6 +625,7 @@ struct proc_dir_entry *proc_symlink(cons
 		ent->data = kmalloc((ent->size=strlen(dest))+1, GFP_KERNEL);
 		if (ent->data) {
 			strcpy((char*)ent->data,dest);
+			ent->destructor = proc_data_destructor;
 			if (proc_register(parent, ent) < 0) {
 				kfree(ent->data);
 				kfree(ent);
@@ -698,8 +704,8 @@ void free_proc_entry(struct proc_dir_ent
 
 	release_inode_number(ino);
 
-	if (S_ISLNK(de->mode) && de->data)
-		kfree(de->data);
+	if (de->destructor)
+		de->destructor(de);
 	kfree(de);
 }
 
--- ./fs/proc/root.c.veprocdtor	Mon Aug 14 17:02:38 2006
+++ ./fs/proc/root.c	Tue Aug 15 13:45:51 2006
@@ -154,6 +154,7 @@ EXPORT_SYMBOL(proc_symlink);
 EXPORT_SYMBOL(proc_mkdir);
 EXPORT_SYMBOL(create_proc_entry);
 EXPORT_SYMBOL(remove_proc_entry);
+EXPORT_SYMBOL(proc_data_destructor);
 EXPORT_SYMBOL(proc_root);
 EXPORT_SYMBOL(proc_root_fs);
 EXPORT_SYMBOL(proc_net);
--- ./include/linux/proc_fs.h.veprocdtor	Mon Aug 14 17:02:47 2006
+++ ./include/linux/proc_fs.h	Tue Aug 15 13:45:51 2006
@@ -46,6 +46,8 @@ typedef	int (read_proc_t)(char *page, ch
 typedef	int (write_proc_t)(struct file *file, const char __user *buffer,
 			   unsigned long count, void *data);
 typedef int (get_info_t)(char *, char **, off_t, int);
+struct proc_dir_entry;
+typedef void (destroy_proc_t)(struct proc_dir_entry *);
 
 struct proc_dir_entry {
 	unsigned int low_ino;
@@ -65,6 +67,7 @@ struct proc_dir_entry {
 	read_proc_t *read_proc;
 	write_proc_t *write_proc;
 	atomic_t count;		/* use count */
+	destroy_proc_t *destructor;
 	int deleted;		/* delete flag */
 	void *set;
 };
@@ -109,6 +112,7 @@ char *task_mem(struct mm_struct *, char 
 extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode,
 						struct proc_dir_entry *parent);
 extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
+extern void proc_data_destructor(struct proc_dir_entry *);
 
 extern struct vfsmount *proc_mnt;
 extern int proc_fill_super(struct super_block *,void *,int);