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); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/