1 files changed, 164 insertions, 0 deletions

diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
new file mode 100644
index 000000000000..8f68827ed10e
--- /dev/null
+++ b/fs/proc/task_nommu.c
@@ -0,0 +1,164 @@
+
+#include <linux/mm.h>
+#include <linux/file.h>
+#include <linux/mount.h>
+#include <linux/seq_file.h>
+#include "internal.h"
+
+/*
+ * Logic: we've got two memory sums for each process, "shared", and
+ * "non-shared". Shared memory may get counted more then once, for
+ * each process that owns it. Non-shared memory is counted
+ * accurately.
+ */
+char *task_mem(struct mm_struct *mm, char *buffer)
+{
+        struct vm_list_struct *vml;
+        unsigned long bytes = 0, sbytes = 0, slack = 0;
+        
+        down_read(&mm->mmap_sem);
+        for (vml = mm->context.vmlist; vml; vml = vml->next) {
+                if (!vml->vma)
+                        continue;
+
+                bytes += kobjsize(vml);
+                if (atomic_read(&mm->mm_count) > 1 ||
+                    atomic_read(&vml->vma->vm_usage) > 1
+                    ) {
+                        sbytes += kobjsize((void *) vml->vma->vm_start);
+                        sbytes += kobjsize(vml->vma);
+                } else {
+                        bytes += kobjsize((void *) vml->vma->vm_start);
+                        bytes += kobjsize(vml->vma);
+                        slack += kobjsize((void *) vml->vma->vm_start) -
+                                (vml->vma->vm_end - vml->vma->vm_start);
+                }
+        }
+
+        if (atomic_read(&mm->mm_count) > 1)
+                sbytes += kobjsize(mm);
+        else
+                bytes += kobjsize(mm);
+        
+        if (current->fs && atomic_read(&current->fs->count) > 1)
+                sbytes += kobjsize(current->fs);
+        else
+                bytes += kobjsize(current->fs);
+
+        if (current->files && atomic_read(&current->files->count) > 1)
+                sbytes += kobjsize(current->files);
+        else
+                bytes += kobjsize(current->files);
+
+        if (current->sighand && atomic_read(&current->sighand->count) > 1)
+                sbytes += kobjsize(current->sighand);
+        else
+                bytes += kobjsize(current->sighand);
+
+        bytes += kobjsize(current); /* includes kernel stack */
+
+        buffer += sprintf(buffer,
+                "Mem:\t%8lu bytes\n"
+                "Slack:\t%8lu bytes\n"
+                "Shared:\t%8lu bytes\n",
+                bytes, slack, sbytes);
+
+        up_read(&mm->mmap_sem);
+        return buffer;
+}
+
+unsigned long task_vsize(struct mm_struct *mm)
+{
+        struct vm_list_struct *tbp;
+        unsigned long vsize = 0;
+
+        down_read(&mm->mmap_sem);
+        for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) {
+                if (tbp->vma)
+                        vsize += kobjsize((void *) tbp->vma->vm_start);
+        }
+        up_read(&mm->mmap_sem);
+        return vsize;
+}
+
+int task_statm(struct mm_struct *mm, int *shared, int *text,
+               int *data, int *resident)
+{
+        struct vm_list_struct *tbp;
+        int size = kobjsize(mm);
+
+        down_read(&mm->mmap_sem);
+        for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) {
+                size += kobjsize(tbp);
+                if (tbp->vma) {
+                        size += kobjsize(tbp->vma);
+                        size += kobjsize((void *) tbp->vma->vm_start);
+                }
+        }
+
+        size += (*text = mm->end_code - mm->start_code);
+        size += (*data = mm->start_stack - mm->start_data);
+        up_read(&mm->mmap_sem);
+        *resident = size;
+        return size;
+}
+
+int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
+{
+        struct vm_list_struct *vml;
+        struct vm_area_struct *vma;
+        struct task_struct *task = proc_task(inode);
+        struct mm_struct *mm = get_task_mm(task);
+        int result = -ENOENT;
+
+        if (!mm)
+                goto out;
+        down_read(&mm->mmap_sem);
+
+        vml = mm->context.vmlist;
+        vma = NULL;
+        while (vml) {
+                if ((vml->vma->vm_flags & VM_EXECUTABLE) && vml->vma->vm_file) {
+                        vma = vml->vma;
+                        break;
+                }
+                vml = vml->next;
+        }
+
+        if (vma) {
+                *mnt = mntget(vma->vm_file->f_vfsmnt);
+                *dentry = dget(vma->vm_file->f_dentry);
+                result = 0;
+        }
+
+        up_read(&mm->mmap_sem);
+        mmput(mm);
+out:
+        return result;
+}
+
+/*
+ * Albert D. Cahalan suggested to fake entries for the traditional
+ * sections here.  This might be worth investigating.
+ */
+static int show_map(struct seq_file *m, void *v)
+{
+        return 0;
+}
+static void *m_start(struct seq_file *m, loff_t *pos)
+{
+        return NULL;
+}
+static void m_stop(struct seq_file *m, void *v)
+{
+}
+static void *m_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        return NULL;
+}
+struct seq_operations proc_pid_maps_op = {
+        .start  = m_start,
+        .next   = m_next,
+        .stop   = m_stop,
+        .show   = show_map
+};