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maps4: move clear_refs code to task_mmu.c 

This puts all the clear_refs code where it belongs and probably lets things
compile on MMU-less systems as well.

Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matt Mackall 2008-02-04 22:29:03 -08:00 committed by Linus Torvalds
parent 4752c36978
commit f248dcb34d
4 changed files with 39 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
fs/proc/base.c
View File

@ -88,10 +88,6 @@
* in /proc for a task before it execs a suid executable.
*/
/* Worst case buffer size needed for holding an integer. */
#define PROC_NUMBUF 13
struct pid_entry {
char *name;
int len;
@ -935,42 +931,6 @@ static const struct file_operations proc_oom_adjust_operations = {
.write = oom_adjust_write,
};
#ifdef CONFIG_MMU
static ssize_t clear_refs_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct task_struct *task;
char buffer[PROC_NUMBUF], *end;
struct mm_struct *mm;
memset(buffer, 0, sizeof(buffer));
if (count > sizeof(buffer) - 1)
count = sizeof(buffer) - 1;
if (copy_from_user(buffer, buf, count))
return -EFAULT;
if (!simple_strtol(buffer, &end, 0))
return -EINVAL;
if (*end == '\n')
end++;
task = get_proc_task(file->f_path.dentry->d_inode);
if (!task)
return -ESRCH;
mm = get_task_mm(task);
if (mm) {
clear_refs_smap(mm);
mmput(mm);
}
put_task_struct(task);
if (end - buffer == 0)
return -EIO;
return end - buffer;
}
static struct file_operations proc_clear_refs_operations = {
.write = clear_refs_write,
};
#endif
#ifdef CONFIG_AUDITSYSCALL
#define TMPBUFLEN 21
static ssize_t proc_loginuid_read(struct file * file, char __user * buf,

6
fs/proc/internal.h
View File

@ -56,11 +56,7 @@ extern int proc_pid_statm(struct task_struct *, char *);
extern const struct file_operations proc_maps_operations;
extern const struct file_operations proc_numa_maps_operations;
extern const struct file_operations proc_smaps_operations;
extern const struct file_operations proc_maps_operations;
extern const struct file_operations proc_numa_maps_operations;
extern const struct file_operations proc_smaps_operations;
extern const struct file_operations proc_clear_refs_operations;
void free_proc_entry(struct proc_dir_entry *de);

44
fs/proc/task_mmu.c
View File

@ -323,19 +323,47 @@ static int show_smap(struct seq_file *m, void *v)
static struct mm_walk clear_refs_walk = { .pmd_entry = clear_refs_pte_range };
void clear_refs_smap(struct mm_struct *mm)
static ssize_t clear_refs_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct task_struct *task;
char buffer[PROC_NUMBUF], *end;
struct mm_struct *mm;
struct vm_area_struct *vma;
down_read(&mm->mmap_sem);
for (vma = mm->mmap; vma; vma = vma->vm_next)
if (vma->vm_mm && !is_vm_hugetlb_page(vma))
walk_page_range(vma->vm_mm, vma->vm_start, vma->vm_end,
&clear_refs_walk, vma);
flush_tlb_mm(mm);
up_read(&mm->mmap_sem);
memset(buffer, 0, sizeof(buffer));
if (count > sizeof(buffer) - 1)
count = sizeof(buffer) - 1;
if (copy_from_user(buffer, buf, count))
return -EFAULT;
if (!simple_strtol(buffer, &end, 0))
return -EINVAL;
if (*end == '\n')
end++;
task = get_proc_task(file->f_path.dentry->d_inode);
if (!task)
return -ESRCH;
mm = get_task_mm(task);
if (mm) {
down_read(&mm->mmap_sem);
for (vma = mm->mmap; vma; vma = vma->vm_next)
if (!is_vm_hugetlb_page(vma))
walk_page_range(mm, vma->vm_start, vma->vm_end,
&clear_refs_walk, vma);
flush_tlb_mm(mm);
up_read(&mm->mmap_sem);
mmput(mm);
}
put_task_struct(task);
if (end - buffer == 0)
return -EIO;
return end - buffer;
}
const struct file_operations proc_clear_refs_operations = {
.write = clear_refs_write,
};
static void *m_start(struct seq_file *m, loff_t *pos)
{
struct proc_maps_private *priv = m->private;

3
include/linux/proc_fs.h
View File

@ -19,6 +19,8 @@ struct completion;
*/
#define FIRST_PROCESS_ENTRY 256
/* Worst case buffer size needed for holding an integer. */
#define PROC_NUMBUF 13
/*
* We always define these enumerators
@ -117,7 +119,6 @@ int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
unsigned long task_vsize(struct mm_struct *);
int task_statm(struct mm_struct *, int *, int *, int *, int *);
char *task_mem(struct mm_struct *, char *);
void clear_refs_smap(struct mm_struct *mm);
struct proc_dir_entry *de_get(struct proc_dir_entry *de);
void de_put(struct proc_dir_entry *de);