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gerrit-public.fairphone.software / kernel / msm-4.9 / 17dd20bd7d4389d3bc54d71e263088039203ea07 / . / fs / quota / compat.c
blob: fb1892fe3e56ca12cb3ae9e83bbc180659c3349e [file] [log] [blame]
Christoph Hellwig5582c762010-02-16 03:44:55 -0500[diff] [blame]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}