VFS: New /proc file /proc/self/mountstats

[safe/jmp/linux-2.6] / fs / namespace.c

diff --git a/fs/namespace.c b/fs/namespace.c
index 39c81a8..71e75bc 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -399,6 +399,44 @@ struct seq_operations mounts_op = {
        .show   = show_vfsmnt
 };
 
+static int show_vfsstat(struct seq_file *m, void *v)
+{
+       struct vfsmount *mnt = v;
+       int err = 0;
+
+       /* device */
+       if (mnt->mnt_devname) {
+               seq_puts(m, "device ");
+               mangle(m, mnt->mnt_devname);
+       } else
+               seq_puts(m, "no device");
+
+       /* mount point */
+       seq_puts(m, " mounted on ");
+       seq_path(m, mnt, mnt->mnt_root, " \t\n\\");
+       seq_putc(m, ' ');
+
+       /* file system type */
+       seq_puts(m, "with fstype ");
+       mangle(m, mnt->mnt_sb->s_type->name);
+
+       /* optional statistics */
+       if (mnt->mnt_sb->s_op->show_stats) {
+               seq_putc(m, ' ');
+               err = mnt->mnt_sb->s_op->show_stats(m, mnt);
+       }
+
+       seq_putc(m, '\n');
+       return err;
+}
+
+struct seq_operations mountstats_op = {
+       .start  = m_start,
+       .next   = m_next,
+       .stop   = m_stop,
+       .show   = show_vfsstat,
+};
+
 /**
  * may_umount_tree - check if a mount tree is busy
  * @mnt: root of mount tree