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mm: extract do_pages_move() out of sys_move_pages()

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To prepare the chunking, move the sys_move_pages() code that is used when
nodes!=NULL into do_pages_move().  And rename do_move_pages() into
do_move_page_to_node_array().

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>
Acked-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Brice Goglin 2008-10-18 20:27:17 -07:00 committed by Linus Torvalds
parent 2f007e74bb
commit 5e9a0f023b
1 changed files with 86 additions and 66 deletions
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152
mm/migrate.c
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@ -826,9 +826,11 @@ static struct page *new_page_node(struct page *p, unsigned long private,
* Move a set of pages as indicated in the pm array. The addr
* field must be set to the virtual address of the page to be moved
* and the node number must contain a valid target node.
* The pm array ends with node = MAX_NUMNODES.
*/
static int do_move_pages(struct mm_struct *mm, struct page_to_node *pm,
int migrate_all)
static int do_move_page_to_node_array(struct mm_struct *mm,
struct page_to_node *pm,
int migrate_all)
{
int err;
struct page_to_node *pp;
@ -905,6 +907,81 @@ set_status:
return err;
}
/*
* Migrate an array of page address onto an array of nodes and fill
* the corresponding array of status.
*/
static int do_pages_move(struct mm_struct *mm, struct task_struct *task,
unsigned long nr_pages,
const void __user * __user *pages,
const int __user *nodes,
int __user *status, int flags)
{
struct page_to_node *pm = NULL;
nodemask_t task_nodes;
int err = 0;
int i;
task_nodes = cpuset_mems_allowed(task);
/* Limit nr_pages so that the multiplication may not overflow */
if (nr_pages >= ULONG_MAX / sizeof(struct page_to_node) - 1) {
err = -E2BIG;
goto out;
}
pm = vmalloc((nr_pages + 1) * sizeof(struct page_to_node));
if (!pm) {
err = -ENOMEM;
goto out;
}
/*
* Get parameters from user space and initialize the pm
* array. Return various errors if the user did something wrong.
*/
for (i = 0; i < nr_pages; i++) {
const void __user *p;
err = -EFAULT;
if (get_user(p, pages + i))
goto out_pm;
pm[i].addr = (unsigned long)p;
if (nodes) {
int node;
if (get_user(node, nodes + i))
goto out_pm;
err = -ENODEV;
if (!node_state(node, N_HIGH_MEMORY))
goto out_pm;
err = -EACCES;
if (!node_isset(node, task_nodes))
goto out_pm;
pm[i].node = node;
} else
pm[i].node = 0; /* anything to not match MAX_NUMNODES */
}
/* End marker */
pm[nr_pages].node = MAX_NUMNODES;
err = do_move_page_to_node_array(mm, pm, flags & MPOL_MF_MOVE_ALL);
if (err >= 0)
/* Return status information */
for (i = 0; i < nr_pages; i++)
if (put_user(pm[i].status, status + i))
err = -EFAULT;
out_pm:
vfree(pm);
out:
return err;
}
/*
* Determine the nodes of an array of pages and store it in an array of status.
*/
@ -963,12 +1040,9 @@ asmlinkage long sys_move_pages(pid_t pid, unsigned long nr_pages,
const int __user *nodes,
int __user *status, int flags)
{
int err = 0;
int i;
struct task_struct *task;
nodemask_t task_nodes;
struct mm_struct *mm;
struct page_to_node *pm = NULL;
int err;
/* Check flags */
if (flags & ~(MPOL_MF_MOVE|MPOL_MF_MOVE_ALL))
@ -1000,75 +1074,21 @@ asmlinkage long sys_move_pages(pid_t pid, unsigned long nr_pages,
(current->uid != task->suid) && (current->uid != task->uid) &&
!capable(CAP_SYS_NICE)) {
err = -EPERM;
goto out2;
goto out;
}
err = security_task_movememory(task);
if (err)
goto out2;
goto out;
if (!nodes) {
if (nodes) {
err = do_pages_move(mm, task, nr_pages, pages, nodes, status,
flags);
} else {
err = do_pages_stat(mm, nr_pages, pages, status);
goto out2;
}
task_nodes = cpuset_mems_allowed(task);
/* Limit nr_pages so that the multiplication may not overflow */
if (nr_pages >= ULONG_MAX / sizeof(struct page_to_node) - 1) {
err = -E2BIG;
goto out2;
}
pm = vmalloc((nr_pages + 1) * sizeof(struct page_to_node));
if (!pm) {
err = -ENOMEM;
goto out2;
}
/*
* Get parameters from user space and initialize the pm
* array. Return various errors if the user did something wrong.
*/
for (i = 0; i < nr_pages; i++) {
const void __user *p;
err = -EFAULT;
if (get_user(p, pages + i))
goto out;
pm[i].addr = (unsigned long)p;
if (nodes) {
int node;
if (get_user(node, nodes + i))
goto out;
err = -ENODEV;
if (!node_state(node, N_HIGH_MEMORY))
goto out;
err = -EACCES;
if (!node_isset(node, task_nodes))
goto out;
pm[i].node = node;
} else
pm[i].node = 0; /* anything to not match MAX_NUMNODES */
}
/* End marker */
pm[nr_pages].node = MAX_NUMNODES;
err = do_move_pages(mm, pm, flags & MPOL_MF_MOVE_ALL);
if (err >= 0)
/* Return status information */
for (i = 0; i < nr_pages; i++)
if (put_user(pm[i].status, status + i))
err = -EFAULT;
out:
vfree(pm);
out2:
mmput(mm);
return err;
}