tcp FRTO: SACK variant is errorneously used with NewReno

[linux-2.6-omap-h63xx.git] / security / device_cgroup.c

diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index 4237b19e8fb3c43a0dcb16572a02cea76e221e69..4ea583689eec0ae6cdb638d7ed025f25e9bac025 100644 (file)
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -9,6 +9,7 @@
 #include <linux/ctype.h>
 #include <linux/list.h>
 #include <linux/uaccess.h>
+#include <linux/seq_file.h>
 
 #define ACC_MKNOD 1
 #define ACC_READ  2
@@ -201,11 +202,15 @@ static void devcgroup_destroy(struct cgroup_subsys *ss,
 
 #define DEVCG_ALLOW 1
 #define DEVCG_DENY 2
+#define DEVCG_LIST 3
+
+#define MAJMINLEN 10
+#define ACCLEN 4
 
 static void set_access(char *acc, short access)
 {
        int idx = 0;
-       memset(acc, 0, 4);
+       memset(acc, 0, ACCLEN);
        if (access & ACC_READ)
                acc[idx++] = 'r';
        if (access & ACC_WRITE)
@@ -225,70 +230,33 @@ static char type_to_char(short type)
        return 'X';
 }
 
-static void set_majmin(char *str, int len, unsigned m)
+static void set_majmin(char *str, unsigned m)
 {
-       memset(str, 0, len);
+       memset(str, 0, MAJMINLEN);
        if (m == ~0)
                sprintf(str, "*");
        else
-               snprintf(str, len, "%d", m);
+               snprintf(str, MAJMINLEN, "%d", m);
 }
 
-static char *print_whitelist(struct dev_cgroup *devcgroup, int *len)
+static int devcgroup_seq_read(struct cgroup *cgroup, struct cftype *cft,
+                               struct seq_file *m)
 {
-       char *buf, *s, acc[4];
+       struct dev_cgroup *devcgroup = cgroup_to_devcgroup(cgroup);
        struct dev_whitelist_item *wh;
-       int ret;
-       int count = 0;
-       char maj[10], min[10];
-
-       buf = kmalloc(4096, GFP_KERNEL);
-       if (!buf)
-               return ERR_PTR(-ENOMEM);
-       s = buf;
-       *s = '\0';
-       *len = 0;
+       char maj[MAJMINLEN], min[MAJMINLEN], acc[ACCLEN];
 
        spin_lock(&devcgroup->lock);
        list_for_each_entry(wh, &devcgroup->whitelist, list) {
                set_access(acc, wh->access);
-               set_majmin(maj, 10, wh->major);
-               set_majmin(min, 10, wh->minor);
-               ret = snprintf(s, 4095-(s-buf), "%c %s:%s %s\n",
-                       type_to_char(wh->type), maj, min, acc);
-               if (s+ret >= buf+4095) {
-                       kfree(buf);
-                       buf = ERR_PTR(-ENOMEM);
-                       break;
-               }
-               s += ret;
-               *len += ret;
-               count++;
+               set_majmin(maj, wh->major);
+               set_majmin(min, wh->minor);
+               seq_printf(m, "%c %s:%s %s\n", type_to_char(wh->type),
+                          maj, min, acc);
        }
        spin_unlock(&devcgroup->lock);
 
-       return buf;
-}
-
-static ssize_t devcgroup_access_read(struct cgroup *cgroup,
-                       struct cftype *cft, struct file *file,
-                       char __user *userbuf, size_t nbytes, loff_t *ppos)
-{
-       struct dev_cgroup *devcgroup = cgroup_to_devcgroup(cgroup);
-       int filetype = cft->private;
-       char *buffer;
-       int uninitialized_var(len);
-       int retval;
-
-       if (filetype != DEVCG_ALLOW)
-               return -EINVAL;
-       buffer = print_whitelist(devcgroup, &len);
-       if (IS_ERR(buffer))
-               return PTR_ERR(buffer);
-
-       retval = simple_read_from_buffer(userbuf, nbytes, ppos, buffer, len);
-       kfree(buffer);
-       return retval;
+       return 0;
 }
 
 /*
@@ -501,7 +469,6 @@ out1:
 static struct cftype dev_cgroup_files[] = {
        {
                .name = "allow",
-               .read = devcgroup_access_read,
                .write  = devcgroup_access_write,
                .private = DEVCG_ALLOW,
        },
@@ -510,6 +477,11 @@ static struct cftype dev_cgroup_files[] = {
                .write = devcgroup_access_write,
                .private = DEVCG_DENY,
        },
+       {
+               .name = "list",
+               .read_seq_string = devcgroup_seq_read,
+               .private = DEVCG_LIST,
+       },
 };
 
 static int devcgroup_populate(struct cgroup_subsys *ss,