quota.c (fc8e1ead9314cf0e0f1922e661428b93d3a50d88) quota.c (86e931a35e93d94e6e91b57cc76456e16d188ea9)
1/*
2 * Quota code necessary even when VFS quota support is not compiled
3 * into the kernel. The interesting stuff is over in dquot.c, here
4 * we have symbols for initial quotactl(2) handling, the sysctl(2)
5 * variables, etc - things needed even when quota support disabled.
6 */
7
8#include <linux/fs.h>

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13#include <linux/compat.h>
14#include <linux/kernel.h>
15#include <linux/security.h>
16#include <linux/syscalls.h>
17#include <linux/buffer_head.h>
18#include <linux/capability.h>
19#include <linux/quotaops.h>
20#include <linux/types.h>
1/*
2 * Quota code necessary even when VFS quota support is not compiled
3 * into the kernel. The interesting stuff is over in dquot.c, here
4 * we have symbols for initial quotactl(2) handling, the sysctl(2)
5 * variables, etc - things needed even when quota support disabled.
6 */
7
8#include <linux/fs.h>

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13#include <linux/compat.h>
14#include <linux/kernel.h>
15#include <linux/security.h>
16#include <linux/syscalls.h>
17#include <linux/buffer_head.h>
18#include <linux/capability.h>
19#include <linux/quotaops.h>
20#include <linux/types.h>
21#include <net/netlink.h>
22#include <net/genetlink.h>
21
22/* Check validity of generic quotactl commands */
23static int generic_quotactl_valid(struct super_block *sb, int type, int cmd,
24 qid_t id)
25{
26 if (type >= MAXQUOTAS)
27 return -EINVAL;
28 if (!sb && cmd != Q_SYNC)

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520 ret = 0;
521 break;
522 default:
523 ret = sys_quotactl(cmd, special, id, addr);
524 }
525 return ret;
526}
527#endif
23
24/* Check validity of generic quotactl commands */
25static int generic_quotactl_valid(struct super_block *sb, int type, int cmd,
26 qid_t id)
27{
28 if (type >= MAXQUOTAS)
29 return -EINVAL;
30 if (!sb && cmd != Q_SYNC)

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522 ret = 0;
523 break;
524 default:
525 ret = sys_quotactl(cmd, special, id, addr);
526 }
527 return ret;
528}
529#endif
530
531
532#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
533
534/* Netlink family structure for quota */
535static struct genl_family quota_genl_family = {
536 .id = GENL_ID_GENERATE,
537 .hdrsize = 0,
538 .name = "VFS_DQUOT",
539 .version = 1,
540 .maxattr = QUOTA_NL_A_MAX,
541};
542
543/**
544 * quota_send_warning - Send warning to userspace about exceeded quota
545 * @type: The quota type: USRQQUOTA, GRPQUOTA,...
546 * @id: The user or group id of the quota that was exceeded
547 * @dev: The device on which the fs is mounted (sb->s_dev)
548 * @warntype: The type of the warning: QUOTA_NL_...
549 *
550 * This can be used by filesystems (including those which don't use
551 * dquot) to send a message to userspace relating to quota limits.
552 *
553 */
554
555void quota_send_warning(short type, unsigned int id, dev_t dev,
556 const char warntype)
557{
558 static atomic_t seq;
559 struct sk_buff *skb;
560 void *msg_head;
561 int ret;
562 int msg_size = 4 * nla_total_size(sizeof(u32)) +
563 2 * nla_total_size(sizeof(u64));
564
565 /* We have to allocate using GFP_NOFS as we are called from a
566 * filesystem performing write and thus further recursion into
567 * the fs to free some data could cause deadlocks. */
568 skb = genlmsg_new(msg_size, GFP_NOFS);
569 if (!skb) {
570 printk(KERN_ERR
571 "VFS: Not enough memory to send quota warning.\n");
572 return;
573 }
574 msg_head = genlmsg_put(skb, 0, atomic_add_return(1, &seq),
575 &quota_genl_family, 0, QUOTA_NL_C_WARNING);
576 if (!msg_head) {
577 printk(KERN_ERR
578 "VFS: Cannot store netlink header in quota warning.\n");
579 goto err_out;
580 }
581 ret = nla_put_u32(skb, QUOTA_NL_A_QTYPE, type);
582 if (ret)
583 goto attr_err_out;
584 ret = nla_put_u64(skb, QUOTA_NL_A_EXCESS_ID, id);
585 if (ret)
586 goto attr_err_out;
587 ret = nla_put_u32(skb, QUOTA_NL_A_WARNING, warntype);
588 if (ret)
589 goto attr_err_out;
590 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MAJOR, MAJOR(dev));
591 if (ret)
592 goto attr_err_out;
593 ret = nla_put_u32(skb, QUOTA_NL_A_DEV_MINOR, MINOR(dev));
594 if (ret)
595 goto attr_err_out;
596 ret = nla_put_u64(skb, QUOTA_NL_A_CAUSED_ID, current_uid());
597 if (ret)
598 goto attr_err_out;
599 genlmsg_end(skb, msg_head);
600
601 genlmsg_multicast(skb, 0, quota_genl_family.id, GFP_NOFS);
602 return;
603attr_err_out:
604 printk(KERN_ERR "VFS: Not enough space to compose quota message!\n");
605err_out:
606 kfree_skb(skb);
607}
608EXPORT_SYMBOL(quota_send_warning);
609
610static int __init quota_init(void)
611{
612 if (genl_register_family(&quota_genl_family) != 0)
613 printk(KERN_ERR
614 "VFS: Failed to create quota netlink interface.\n");
615 return 0;
616};
617
618module_init(quota_init);
619#endif
620