| Christoph Hellwig | 5582c76 | 2010-02-16 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 | */ |
| 10 | struct 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 */ |
| 23 | struct compat_fs_qfilestat { |
| 24 | compat_u64 dqb_bhardlimit; |
| 25 | compat_u64 qfs_nblks; |
| 26 | compat_uint_t qfs_nextents; |
| 27 | }; |
| 28 | |
| 29 | struct 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 | |
| 43 | asmlinkage 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 | } |