blob: bb2869f5dfd89528f6986528369438a8cc565efd [file] [log] [blame]
#include <linux/cred.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/quotaops.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <net/netlink.h>
#include <net/genetlink.h>
static const struct genl_multicast_group quota_mcgrps[] = {
{ .name = "events", },
/* Netlink family structure for quota */
static struct genl_family quota_genl_family = {
* Needed due to multicast group ID abuse - old code assumed
* the family ID was also a valid multicast group ID (which
* isn't true) and userspace might thus rely on it. Assign a
* static ID for this group to make dealing with that easier.
.hdrsize = 0,
.name = "VFS_DQUOT",
.version = 1,
.maxattr = QUOTA_NL_A_MAX,
.mcgrps = quota_mcgrps,
.n_mcgrps = ARRAY_SIZE(quota_mcgrps),
* quota_send_warning - Send warning to userspace about exceeded quota
* @qid: The kernel internal quota identifier.
* @dev: The device on which the fs is mounted (sb->s_dev)
* @warntype: The type of the warning: QUOTA_NL_...
* This can be used by filesystems (including those which don't use
* dquot) to send a message to userspace relating to quota limits.
void quota_send_warning(struct kqid qid, dev_t dev,
const char warntype)
static atomic_t seq;
struct sk_buff *skb;
void *msg_head;
int ret;
int msg_size = 4 * nla_total_size(sizeof(u32)) +
2 * nla_total_size(sizeof(u64));
/* We have to allocate using GFP_NOFS as we are called from a
* filesystem performing write and thus further recursion into
* the fs to free some data could cause deadlocks. */
skb = genlmsg_new(msg_size, GFP_NOFS);
if (!skb) {
"VFS: Not enough memory to send quota warning.\n");
msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
&quota_genl_family, 0, QUOTA_NL_C_WARNING);
if (!msg_head) {
"VFS: Cannot store netlink header in quota warning.\n");
goto err_out;
ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, qid.type);
if (ret)
goto attr_err_out;
ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID,
from_kqid_munged(&init_user_ns, qid));
if (ret)
goto attr_err_out;
ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype);
if (ret)
goto attr_err_out;
ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR, MAJOR(dev));
if (ret)
goto attr_err_out;
ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR, MINOR(dev));
if (ret)
goto attr_err_out;
ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID,
from_kuid_munged(&init_user_ns, current_uid()));
if (ret)
goto attr_err_out;
genlmsg_end(skb, msg_head);
genlmsg_multicast(&quota_genl_family, skb, 0, 0, GFP_NOFS);
printk(KERN_ERR "VFS: Not enough space to compose quota message!\n");
static int __init quota_init(void)
if (genl_register_family(&quota_genl_family) != 0)
"VFS: Failed to create quota netlink interface.\n");
return 0;