1
2#include <linux/syscalls.h>
3#include <linux/compat.h>
4#include <linux/quotaops.h>
5
6/*
7 * This code works only for 32 bit quota tools over 64 bit OS (x86_64, ia64)
8 * and is necessary due to alignment problems.
9 */
10struct compat_if_dqblk {
11	compat_u64 dqb_bhardlimit;
12	compat_u64 dqb_bsoftlimit;
13	compat_u64 dqb_curspace;
14	compat_u64 dqb_ihardlimit;
15	compat_u64 dqb_isoftlimit;
16	compat_u64 dqb_curinodes;
17	compat_u64 dqb_btime;
18	compat_u64 dqb_itime;
19	compat_uint_t dqb_valid;
20};
21
22/* XFS structures */
23struct compat_fs_qfilestat {
24	compat_u64 dqb_bhardlimit;
25	compat_u64 qfs_nblks;
26	compat_uint_t qfs_nextents;
27};
28
29struct compat_fs_quota_stat {
30	__s8		qs_version;
31	__u16		qs_flags;
32	__s8		qs_pad;
33	struct compat_fs_qfilestat	qs_uquota;
34	struct compat_fs_qfilestat	qs_gquota;
35	compat_uint_t	qs_incoredqs;
36	compat_int_t	qs_btimelimit;
37	compat_int_t	qs_itimelimit;
38	compat_int_t	qs_rtbtimelimit;
39	__u16		qs_bwarnlimit;
40	__u16		qs_iwarnlimit;
41};
42
43asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special,
44						qid_t id, void __user *addr)
45{
46	unsigned int cmds;
47	struct if_dqblk __user *dqblk;
48	struct compat_if_dqblk __user *compat_dqblk;
49	struct fs_quota_stat __user *fsqstat;
50	struct compat_fs_quota_stat __user *compat_fsqstat;
51	compat_uint_t data;
52	u16 xdata;
53	long ret;
54
55	cmds = cmd >> SUBCMDSHIFT;
56
57	switch (cmds) {
58	case Q_GETQUOTA:
59		dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
60		compat_dqblk = addr;
61		ret = sys_quotactl(cmd, special, id, dqblk);
62		if (ret)
63			break;
64		if (copy_in_user(compat_dqblk, dqblk, sizeof(*compat_dqblk)) ||
65			get_user(data, &dqblk->dqb_valid) ||
66			put_user(data, &compat_dqblk->dqb_valid))
67			ret = -EFAULT;
68		break;
69	case Q_SETQUOTA:
70		dqblk = compat_alloc_user_space(sizeof(struct if_dqblk));
71		compat_dqblk = addr;
72		ret = -EFAULT;
73		if (copy_in_user(dqblk, compat_dqblk, sizeof(*compat_dqblk)) ||
74			get_user(data, &compat_dqblk->dqb_valid) ||
75			put_user(data, &dqblk->dqb_valid))
76			break;
77		ret = sys_quotactl(cmd, special, id, dqblk);
78		break;
79	case Q_XGETQSTAT:
80		fsqstat = compat_alloc_user_space(sizeof(struct fs_quota_stat));
81		compat_fsqstat = addr;
82		ret = sys_quotactl(cmd, special, id, fsqstat);
83		if (ret)
84			break;
85		ret = -EFAULT;
86		/* Copying qs_version, qs_flags, qs_pad */
87		if (copy_in_user(compat_fsqstat, fsqstat,
88			offsetof(struct compat_fs_quota_stat, qs_uquota)))
89			break;
90		/* Copying qs_uquota */
91		if (copy_in_user(&compat_fsqstat->qs_uquota,
92			&fsqstat->qs_uquota,
93			sizeof(compat_fsqstat->qs_uquota)) ||
94			get_user(data, &fsqstat->qs_uquota.qfs_nextents) ||
95			put_user(data, &compat_fsqstat->qs_uquota.qfs_nextents))
96			break;
97		/* Copying qs_gquota */
98		if (copy_in_user(&compat_fsqstat->qs_gquota,
99			&fsqstat->qs_gquota,
100			sizeof(compat_fsqstat->qs_gquota)) ||
101			get_user(data, &fsqstat->qs_gquota.qfs_nextents) ||
102			put_user(data, &compat_fsqstat->qs_gquota.qfs_nextents))
103			break;
104		/* Copying the rest */
105		if (copy_in_user(&compat_fsqstat->qs_incoredqs,
106			&fsqstat->qs_incoredqs,
107			sizeof(struct compat_fs_quota_stat) -
108			offsetof(struct compat_fs_quota_stat, qs_incoredqs)) ||
109			get_user(xdata, &fsqstat->qs_iwarnlimit) ||
110			put_user(xdata, &compat_fsqstat->qs_iwarnlimit))
111			break;
112		ret = 0;
113		break;
114	default:
115		ret = sys_quotactl(cmd, special, id, addr);
116	}
117	return ret;
118}
119