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[PATCH] NOMMU: Implement /proc/pid/maps for NOMMU

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Implement /proc/pid/maps for NOMMU by reading the vm_area_list attached to
current->mm->context.vmlist.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Howells
2006-09-27 01:50:19 -07:00
committed by Linus Torvalds
parent d00c7b9937
commit dbf8685c8e
5 changed files with 80 additions and 20 deletions
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74
fs/proc/task_nommu.c
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@@ -138,25 +138,63 @@ out:
}
/*
* Albert D. Cahalan suggested to fake entries for the traditional
* sections here. This might be worth investigating.
* display mapping lines for a particular process's /proc/pid/maps
*/
static int show_map(struct seq_file *m, void *v)
static int show_map(struct seq_file *m, void *_vml)
{
return 0;
struct vm_list_struct *vml = _vml;
return nommu_vma_show(m, vml->vma);
}
static void *m_start(struct seq_file *m, loff_t *pos)
{
struct proc_maps_private *priv = m->private;
struct vm_list_struct *vml;
struct mm_struct *mm;
loff_t n = *pos;
/* pin the task and mm whilst we play with them */
priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
if (!priv->task)
return NULL;
mm = get_task_mm(priv->task);
if (!mm) {
put_task_struct(priv->task);
priv->task = NULL;
return NULL;
}
down_read(&mm->mmap_sem);
/* start from the Nth VMA */
for (vml = mm->context.vmlist; vml; vml = vml->next)
if (n-- == 0)
return vml;
return NULL;
}
static void m_stop(struct seq_file *m, void *v)
static void m_stop(struct seq_file *m, void *_vml)
{
struct proc_maps_private *priv = m->private;
if (priv->task) {
struct mm_struct *mm = priv->task->mm;
up_read(&mm->mmap_sem);
mmput(mm);
put_task_struct(priv->task);
}
}
static void *m_next(struct seq_file *m, void *v, loff_t *pos)
static void *m_next(struct seq_file *m, void *_vml, loff_t *pos)
{
return NULL;
struct vm_list_struct *vml = _vml;
(*pos)++;
return vml ? vml->next : NULL;
}
static struct seq_operations proc_pid_maps_op = {
static struct seq_operations proc_pid_maps_ops = {
.start = m_start,
.next = m_next,
.stop = m_stop,
@@ -165,11 +203,19 @@ static struct seq_operations proc_pid_maps_op = {
static int maps_open(struct inode *inode, struct file *file)
{
int ret;
ret = seq_open(file, &proc_pid_maps_op);
if (!ret) {
struct seq_file *m = file->private_data;
m->private = NULL;
struct proc_maps_private *priv;
int ret = -ENOMEM;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (priv) {
priv->pid = proc_pid(inode);
ret = seq_open(file, &proc_pid_maps_ops);
if (!ret) {
struct seq_file *m = file->private_data;
m->private = priv;
} else {
kfree(priv);
}
}
return ret;
}
@@ -178,6 +224,6 @@ struct file_operations proc_maps_operations = {
.open = maps_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
.release = seq_release_private,
};