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fs/quota/netlink.c
2.59 KB
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#include <linux/cred.h> #include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/quotaops.h> #include <linux/sched.h> |
5a0e3ad6a include cleanup: ... |
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#include <linux/slab.h> |
799a9d440 quota: split out ... |
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#include <net/netlink.h> #include <net/genetlink.h> /* Netlink family structure for quota */ static struct genl_family quota_genl_family = { .id = GENL_ID_GENERATE, .hdrsize = 0, .name = "VFS_DQUOT", .version = 1, .maxattr = QUOTA_NL_A_MAX, }; /** * quota_send_warning - Send warning to userspace about exceeded quota * @type: The quota type: USRQQUOTA, GRPQUOTA,... * @id: The user or group id of the quota that was exceeded * @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(short type, unsigned int id, 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) { printk(KERN_ERR "VFS: Not enough memory to send quota warning. "); return; } msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq), "a_genl_family, 0, QUOTA_NL_C_WARNING); if (!msg_head) { printk(KERN_ERR "VFS: Cannot store netlink header in quota warning. "); goto err_out; } ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, type); if (ret) goto attr_err_out; ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, id); 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, current_uid()); if (ret) goto attr_err_out; genlmsg_end(skb, msg_head); genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS); return; attr_err_out: printk(KERN_ERR "VFS: Not enough space to compose quota message! "); err_out: kfree_skb(skb); } EXPORT_SYMBOL(quota_send_warning); static int __init quota_init(void) { if (genl_register_family("a_genl_family) != 0) printk(KERN_ERR "VFS: Failed to create quota netlink interface. "); return 0; }; module_init(quota_init); |