Add new field to struct proc_inode and struct pid_entry: ctl_name. It
will be used to hold the ctl_name value of the sysctl that is responsible
for the respective inode or pid_entry. Also initialize this value for
our example sysctl (proc.cmdline).
diff -pur l1/fs/proc/base.c l2/fs/proc/base.c
--- l1/fs/proc/base.c 2005-03-19 19:59:00.000000000 +0100
+++ l2/fs/proc/base.c 2005-03-19 19:59:43.000000000 +0100
@@ -35,6 +35,7 @@
#include <linux/seccomp.h>
#include <linux/cpuset.h>
#include <linux/audit.h>
+#include <linux/sysctl.h>
#include "internal.h"
/*
@@ -130,9 +131,18 @@ struct pid_entry {
int len;
char *name;
mode_t mode;
+#ifdef CONFIG_SYSCTL
+ int ctl_name;
+#endif
};
-#define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)}
+#ifdef CONFIG_SYSCTL
+#define E(type, name, mode) {(type), sizeof(name)-1, (name),
(mode), 0}
+#define S(type, name, mode, ctl_name) {(type), sizeof(name)-1, (name),
(mode), (ctl_name)}
+#else
+#define E(type, name, mode) {(type), sizeof(name)-1, (name), (mode)}
+#define S(type, name, mode, ctl_name) {(type), sizeof(name)-1, (name), (mode)}
+#endif /* CONFIG_SYSCTL */
static struct pid_entry tgid_base_stuff[] = {
E(PROC_TGID_TASK, "task", S_IFDIR|S_IRUGO|S_IXUGO),
@@ -140,7 +150,7 @@ static struct pid_entry tgid_base_stuff[
E(PROC_TGID_ENVIRON, "environ", S_IFREG|S_IRUSR),
E(PROC_TGID_AUXV, "auxv", S_IFREG|S_IRUSR),
E(PROC_TGID_STATUS, "status", S_IFREG|S_IRUGO),
- E(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
+ S(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO, PROC_CMDLINE),
E(PROC_TGID_STAT, "stat", S_IFREG|S_IRUGO),
E(PROC_TGID_STATM, "statm", S_IFREG|S_IRUGO),
E(PROC_TGID_MAPS, "maps", S_IFREG|S_IRUGO),
@@ -176,7 +186,7 @@ static struct pid_entry tid_base_stuff[]
E(PROC_TID_ENVIRON, "environ", S_IFREG|S_IRUSR),
E(PROC_TID_AUXV, "auxv", S_IFREG|S_IRUSR),
E(PROC_TID_STATUS, "status", S_IFREG|S_IRUGO),
- E(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
+ S(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO, PROC_CMDLINE),
E(PROC_TID_STAT, "stat", S_IFREG|S_IRUGO),
E(PROC_TID_STATM, "statm", S_IFREG|S_IRUGO),
E(PROC_TID_MAPS, "maps", S_IFREG|S_IRUGO),
@@ -226,6 +236,7 @@ static struct pid_entry tid_attr_stuff[]
#endif
#undef E
+#undef S
#ifdef CONFIG_SYSCTL
/* Order and number of elements must match CTL_PROC table in sysctl.h! */
@@ -1150,6 +1161,9 @@ static struct inode *proc_pid_make_inode
get_task_struct(task);
ei->task = task;
ei->type = ino;
+#ifdef CONFIG_SYSCTL
+ ei->ctl_name = 0;
+#endif
inode->i_uid = 0;
inode->i_gid = 0;
if (ino == PROC_TGID_INO || ino == PROC_TID_INO || task_dumpable(task))
{
@@ -1458,6 +1472,9 @@ static struct dentry *proc_pident_lookup
goto out;
ei = PROC_I(inode);
+#ifdef CONFIG_SYSCTL
+ ei->ctl_name = p->ctl_name;
+#endif
inode->i_mode = p->mode;
/*
* Yes, it does not scale. And it should not. Don't add
diff -pur l1/fs/proc/internal.h l2/fs/proc/internal.h
--- l1/fs/proc/internal.h 2005-02-12 09:26:31.000000000 +0100
+++ l2/fs/proc/internal.h 2005-03-19 19:55:44.000000000 +0100
@@ -46,3 +46,8 @@ static inline int proc_type(struct inode
{
return PROC_I(inode)->type;
}
+
+static inline int proc_ctl_name(struct inode *inode)
+{
+ return PROC_I(inode)->ctl_name;
+}
diff -pur l1/include/linux/proc_fs.h l2/include/linux/proc_fs.h
--- l1/include/linux/proc_fs.h 2005-02-12 09:26:36.000000000 +0100
+++ l2/include/linux/proc_fs.h 2005-03-19 19:55:44.000000000 +0100
@@ -238,6 +238,7 @@ extern void kclist_add(struct kcore_list
struct proc_inode {
struct task_struct *task;
int type;
+ int ctl_name;
union {
int (*proc_get_link)(struct inode *, struct dentry **, struct
vfsmount **);
int (*proc_read)(struct task_struct *task, char *page);
-
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