lowmem: add compatibility code

[pandora-kernel.git] / security / lowmem.c

diff --git a/security/lowmem.c b/security/lowmem.c
index 87f6cec..56f1f6e 100644 (file)
--- a/security/lowmem.c
+++ b/security/lowmem.c
@@ -23,6 +23,10 @@ enum {
        VM_LOWMEM_ALLOWED_UIDS,
        VM_LOWMEM_ALLOWED_PAGES,
        VM_LOWMEM_FREE_PAGES,
+       VM_LOWMEM_DENY,
+       VM_LOWMEM_LEVEL1_NOTIFY,
+       VM_LOWMEM_LEVEL2_NOTIFY,
+       VM_LOWMEM_USED_PAGES
 };
 
 static long deny_pages;
@@ -33,6 +37,22 @@ static unsigned long lowmem_free_pages;
 static unsigned int allowed_uids[LOWMEM_MAX_UIDS];
 static unsigned int minuid = 1;
 static unsigned int maxuid = 65535;
+static unsigned int deny_percentage;
+static unsigned int l1_notify, l2_notify;
+static long used_pages;
+
+static int
+proc_dointvec_used(ctl_table *table, int write, struct file *filp,
+                       void __user *buffer, size_t *lenp, loff_t *ppos);
+static int
+proc_dointvec_l1_notify(ctl_table *table, int write, struct file *filp,
+                       void __user *buffer, size_t *lenp, loff_t *ppos);
+static int
+proc_dointvec_l2_notify(ctl_table *table, int write, struct file *filp,
+                       void __user *buffer, size_t *lenp, loff_t *ppos);
+static int
+proc_dointvec_deny(ctl_table *table, int write, struct file *filp,
+                       void __user *buffer, size_t *lenp, loff_t *ppos);
 
 static ctl_table lowmem_table[] = {
        {
@@ -44,6 +64,42 @@ static ctl_table lowmem_table[] = {
                .child = NULL,
                .proc_handler = &proc_dointvec,
                .strategy = &sysctl_intvec,
+       }, {
+               .ctl_name = VM_LOWMEM_DENY,
+               .procname = "lowmem_deny_watermark",
+               .data = &deny_percentage,
+               .maxlen = sizeof(unsigned int),
+               .mode = 0444,
+               .child = NULL,
+               .proc_handler = &proc_dointvec_deny,
+               .strategy = &sysctl_intvec,
+       }, {
+               .ctl_name = VM_LOWMEM_LEVEL1_NOTIFY,
+               .procname = "lowmem_notify_low",
+               .data = &l1_notify,
+               .maxlen = sizeof(unsigned int),
+               .mode = 0444,
+               .child = NULL,
+               .proc_handler = &proc_dointvec_l1_notify,
+               .strategy = &sysctl_intvec,
+       }, {
+               .ctl_name = VM_LOWMEM_LEVEL2_NOTIFY,
+               .procname = "lowmem_notify_high",
+               .data = &l2_notify,
+               .maxlen = sizeof(unsigned int),
+               .mode = 0444,
+               .child = NULL,
+               .proc_handler = &proc_dointvec_l2_notify,
+               .strategy = &sysctl_intvec,
+       }, {
+               .ctl_name = VM_LOWMEM_USED_PAGES,
+               .procname = "lowmem_used_pages",
+               .data = &used_pages,
+               .maxlen = sizeof(long),
+               .mode = 0444,
+               .child = NULL,
+               .proc_handler = &proc_dointvec_used,
+               .strategy = &sysctl_intvec,
        }, {
                .ctl_name = VM_LOWMEM_NOTIFY_LOW_PAGES,
                .procname = "lowmem_notify_low_pages",
@@ -121,6 +177,44 @@ static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
 
 static int low_watermark_reached, high_watermark_reached;
 
+static int
+proc_dointvec_l1_notify(ctl_table *table, int write, struct file *filp,
+                       void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+       l1_notify =
+       100 - (100 * notify_low_pages + allowed_pages / 2) / allowed_pages;
+       return proc_dointvec(table, write, filp, buffer, lenp, ppos);
+}
+
+static int
+proc_dointvec_l2_notify(ctl_table *table, int write, struct file *filp,
+                       void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+       l2_notify =
+       100 - (100 * notify_high_pages + allowed_pages / 2) / allowed_pages;
+       return proc_dointvec(table, write, filp, buffer, lenp, ppos);
+}
+
+static int
+proc_dointvec_deny(ctl_table *table, int write, struct file *filp,
+                       void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+       deny_percentage =
+       100 - (100 * deny_pages + allowed_pages / 2) / allowed_pages;
+       return proc_dointvec(table, write, filp, buffer, lenp, ppos);
+}
+
+static int
+proc_dointvec_used(ctl_table *table, int write, struct file *filp,
+                       void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+       if (lowmem_free_pages > 0 && allowed_pages > lowmem_free_pages)
+               used_pages = allowed_pages - lowmem_free_pages;
+       else
+               used_pages = 0;
+       return proc_dointvec(table, write, filp, buffer, lenp, ppos);
+}
+
 static ssize_t low_watermark_show(struct kobject *kobj,
                                  struct kobj_attribute *attr, char *page)
 {