1#include <linux/cred.h>
2#include <linux/init.h>
3#include <linux/kernel.h>
4#include <linux/quotaops.h>
5#include <linux/sched.h>
6#include <linux/slab.h>
7#include <net/netlink.h>
8#include <net/genetlink.h>
9
10static const struct genl_multicast_group quota_mcgrps[] = {
11 { .name = "events", },
12};
13
14
15static struct genl_family quota_genl_family = {
16
17
18
19
20
21
22 .id = GENL_ID_VFS_DQUOT,
23 .hdrsize = 0,
24 .name = "VFS_DQUOT",
25 .version = 1,
26 .maxattr = QUOTA_NL_A_MAX,
27 .mcgrps = quota_mcgrps,
28 .n_mcgrps = ARRAY_SIZE(quota_mcgrps),
29};
30
31
32
33
34
35
36
37
38
39
40
41
42void quota_send_warning(struct kqid qid, dev_t dev,
43 const char warntype)
44{
45 static atomic_t seq;
46 struct sk_buff *skb;
47 void *msg_head;
48 int ret;
49 int msg_size = 4 * nla_total_size(sizeof(u32)) +
50 2 * nla_total_size(sizeof(u64));
51
52
53
54
55 skb = genlmsg_new(msg_size, GFP_NOFS);
56 if (!skb) {
57 printk(KERN_ERR
58 "VFS: Not enough memory to send quota warning.\n");
59 return;
60 }
61 msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
62 "a_genl_family, 0, QUOTA_NL_C_WARNING);
63 if (!msg_head) {
64 printk(KERN_ERR
65 "VFS: Cannot store netlink header in quota warning.\n");
66 goto err_out;
67 }
68 ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, qid.type);
69 if (ret)
70 goto attr_err_out;
71 ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID,
72 from_kqid_munged(&init_user_ns, qid));
73 if (ret)
74 goto attr_err_out;
75 ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype);
76 if (ret)
77 goto attr_err_out;
78 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR, MAJOR(dev));
79 if (ret)
80 goto attr_err_out;
81 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR, MINOR(dev));
82 if (ret)
83 goto attr_err_out;
84 ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID,
85 from_kuid_munged(&init_user_ns, current_uid()));
86 if (ret)
87 goto attr_err_out;
88 genlmsg_end(skb, msg_head);
89
90 genlmsg_multicast("a_genl_family, skb, 0, 0, GFP_NOFS);
91 return;
92attr_err_out:
93 printk(KERN_ERR "VFS: Not enough space to compose quota message!\n");
94err_out:
95 kfree_skb(skb);
96}
97EXPORT_SYMBOL(quota_send_warning);
98
99static int __init quota_init(void)
100{
101 if (genl_register_family("a_genl_family) != 0)
102 printk(KERN_ERR
103 "VFS: Failed to create quota netlink interface.\n");
104 return 0;
105};
106fs_initcall(quota_init);
107