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1 | |
2 | #include <linux/cred.h> |
3 | #include <linux/init.h> |
4 | #include <linux/module.h> |
5 | #include <linux/kernel.h> |
6 | #include <linux/quotaops.h> |
7 | #include <linux/sched.h> |
8 | #include <linux/slab.h> |
9 | #include <net/netlink.h> |
10 | #include <net/genetlink.h> |
11 | |
12 | /* Netlink family structure for quota */ |
13 | static struct genl_family quota_genl_family = { |
14 | .id = GENL_ID_GENERATE, |
15 | .hdrsize = 0, |
16 | .name = "VFS_DQUOT", |
17 | .version = 1, |
18 | .maxattr = QUOTA_NL_A_MAX, |
19 | }; |
20 | |
21 | /** |
22 | * quota_send_warning - Send warning to userspace about exceeded quota |
23 | * @type: The quota type: USRQQUOTA, GRPQUOTA,... |
24 | * @id: The user or group id of the quota that was exceeded |
25 | * @dev: The device on which the fs is mounted (sb->s_dev) |
26 | * @warntype: The type of the warning: QUOTA_NL_... |
27 | * |
28 | * This can be used by filesystems (including those which don't use |
29 | * dquot) to send a message to userspace relating to quota limits. |
30 | * |
31 | */ |
32 | |
33 | void quota_send_warning(short type, unsigned int id, dev_t dev, |
34 | const char warntype) |
35 | { |
36 | static atomic_t seq; |
37 | struct sk_buff *skb; |
38 | void *msg_head; |
39 | int ret; |
40 | int msg_size = 4 * nla_total_size(sizeof(u32)) + |
41 | 2 * nla_total_size(sizeof(u64)); |
42 | |
43 | /* We have to allocate using GFP_NOFS as we are called from a |
44 | * filesystem performing write and thus further recursion into |
45 | * the fs to free some data could cause deadlocks. */ |
46 | skb = genlmsg_new(msg_size, GFP_NOFS); |
47 | if (!skb) { |
48 | printk(KERN_ERR |
49 | "VFS: Not enough memory to send quota warning.\n"); |
50 | return; |
51 | } |
52 | msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq), |
53 | "a_genl_family, 0, QUOTA_NL_C_WARNING); |
54 | if (!msg_head) { |
55 | printk(KERN_ERR |
56 | "VFS: Cannot store netlink header in quota warning.\n"); |
57 | goto err_out; |
58 | } |
59 | ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, type); |
60 | if (ret) |
61 | goto attr_err_out; |
62 | ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, id); |
63 | if (ret) |
64 | goto attr_err_out; |
65 | ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype); |
66 | if (ret) |
67 | goto attr_err_out; |
68 | ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR, MAJOR(dev)); |
69 | if (ret) |
70 | goto attr_err_out; |
71 | ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR, MINOR(dev)); |
72 | if (ret) |
73 | goto attr_err_out; |
74 | ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid()); |
75 | if (ret) |
76 | goto attr_err_out; |
77 | genlmsg_end(skb, msg_head); |
78 | |
79 | genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS); |
80 | return; |
81 | attr_err_out: |
82 | printk(KERN_ERR "VFS: Not enough space to compose quota message!\n"); |
83 | err_out: |
84 | kfree_skb(skb); |
85 | } |
86 | EXPORT_SYMBOL(quota_send_warning); |
87 | |
88 | static int __init quota_init(void) |
89 | { |
90 | if (genl_register_family("a_genl_family) != 0) |
91 | printk(KERN_ERR |
92 | "VFS: Failed to create quota netlink interface.\n"); |
93 | return 0; |
94 | }; |
95 | |
96 | module_init(quota_init); |
97 |
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