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Subject[PATCH] proc filesystem (3/3): add proc_show_options()
This patch adds a show_options function to the proc filesystem.

diff -pur l2/fs/proc/inode.c l3/fs/proc/inode.c
--- l2/fs/proc/inode.c 2005-02-01 04:51:23.000000000 +0100
+++ l3/fs/proc/inode.c 2005-02-01 04:51:07.000000000 +0100
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/parser.h>
#include <linux/smp_lock.h>
+#include <linux/seq_file.h>

#include <asm/system.h>
#include <asm/uaccess.h>
@@ -23,6 +24,9 @@
extern umode_t proc_umask;
extern void free_proc_entry(struct proc_dir_entry *);

+static int proc_root_inode_uid;
+static int proc_root_inode_gid;
+
static inline struct proc_dir_entry * de_get(struct proc_dir_entry *de)
{
if (de)
@@ -134,6 +138,17 @@ static int proc_remount(struct super_blo
return 0;
}

+static int proc_show_options(struct seq_file *m, struct vfsmount *mnt)
+{
+ if (proc_root_inode_uid != 0)
+ seq_printf(m, ",uid=%i", proc_root_inode_uid);
+ if (proc_root_inode_gid != 0)
+ seq_printf(m, ",gid=%i", proc_root_inode_gid);
+ if (proc_umask != 0)
+ seq_printf(m, ",umask=%04o", proc_umask);
+ return 0;
+}
+
static struct super_operations proc_sops = {
.alloc_inode = proc_alloc_inode,
.destroy_inode = proc_destroy_inode,
@@ -142,6 +157,7 @@ static struct super_operations proc_sops
.delete_inode = proc_delete_inode,
.statfs = simple_statfs,
.remount_fs = proc_remount,
+ .show_options = proc_show_options,
};

enum {
@@ -248,6 +264,8 @@ int proc_fill_super(struct super_block *
struct inode * root_inode;

proc_umask = 0;
+ proc_root_inode_uid = 0;
+ proc_root_inode_gid = 0;
s->s_flags |= MS_NODIRATIME;
s->s_blocksize = 1024;
s->s_blocksize_bits = 10;
@@ -262,12 +280,12 @@ int proc_fill_super(struct super_block *
* Fixup the root inode's nlink value
*/
root_inode->i_nlink += nr_processes();
- root_inode->i_uid = 0;
- root_inode->i_gid = 0;
s->s_root = d_alloc_root(root_inode);
if (!s->s_root)
goto out_no_root;
- parse_options(data, &root_inode->i_uid, &root_inode->i_gid);
+ parse_options(data, &proc_root_inode_uid, &proc_root_inode_gid);
+ root_inode->i_uid = proc_root_inode_uid;
+ root_inode->i_gid = proc_root_inode_gid;
return 0;

out_no_root:
-
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