Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
| 9 | #include <linux/namei.h> |
| 10 | #include <linux/slab.h> |
| 11 | #include <asm/current.h> |
Jeff Liu | f3da931 | 2012-05-28 23:40:17 +0800 | [diff] [blame] | 12 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/security.h> |
| 15 | #include <linux/syscalls.h> |
Randy Dunlap | 16f7e0f | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 16 | #include <linux/capability.h> |
Adrian Bunk | be586ba | 2005-11-07 00:59:35 -0800 | [diff] [blame] | 17 | #include <linux/quotaops.h> |
Vasily Tarasov | b716395 | 2007-07-15 23:41:12 -0700 | [diff] [blame] | 18 | #include <linux/types.h> |
Christoph Hellwig | 8c4e4ac | 2010-02-16 03:44:51 -0500 | [diff] [blame] | 19 | #include <linux/writeback.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
Christoph Hellwig | c988afb | 2010-02-16 03:44:50 -0500 | [diff] [blame] | 21 | static int check_quotactl_permission(struct super_block *sb, int type, int cmd, |
| 22 | qid_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | { |
Christoph Hellwig | c988afb | 2010-02-16 03:44:50 -0500 | [diff] [blame] | 24 | switch (cmd) { |
| 25 | /* these commands do not require any special privilegues */ |
| 26 | case Q_GETFMT: |
| 27 | case Q_SYNC: |
| 28 | case Q_GETINFO: |
| 29 | case Q_XGETQSTAT: |
Chandra Seetharaman | af30cb4 | 2013-08-06 17:27:07 -0500 | [diff] [blame] | 30 | case Q_XGETQSTATV: |
Christoph Hellwig | c988afb | 2010-02-16 03:44:50 -0500 | [diff] [blame] | 31 | case Q_XQUOTASYNC: |
| 32 | break; |
| 33 | /* allow to query information for dquots we "own" */ |
| 34 | case Q_GETQUOTA: |
| 35 | case Q_XGETQUOTA: |
Eric W. Biederman | 74a8a10 | 2012-09-16 02:07:49 -0700 | [diff] [blame] | 36 | if ((type == USRQUOTA && uid_eq(current_euid(), make_kuid(current_user_ns(), id))) || |
| 37 | (type == GRPQUOTA && in_egroup_p(make_kgid(current_user_ns(), id)))) |
Christoph Hellwig | c988afb | 2010-02-16 03:44:50 -0500 | [diff] [blame] | 38 | break; |
| 39 | /*FALLTHROUGH*/ |
| 40 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | if (!capable(CAP_SYS_ADMIN)) |
| 42 | return -EPERM; |
| 43 | } |
| 44 | |
Christoph Hellwig | c988afb | 2010-02-16 03:44:50 -0500 | [diff] [blame] | 45 | return security_quotactl(cmd, type, id, sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | } |
| 47 | |
Al Viro | 01a05b3 | 2010-03-23 06:06:58 -0400 | [diff] [blame] | 48 | static void quota_sync_one(struct super_block *sb, void *arg) |
| 49 | { |
| 50 | if (sb->s_qcop && sb->s_qcop->quota_sync) |
Jan Kara | ceed172 | 2012-07-03 16:45:28 +0200 | [diff] [blame] | 51 | sb->s_qcop->quota_sync(sb, *(int *)arg); |
Al Viro | 01a05b3 | 2010-03-23 06:06:58 -0400 | [diff] [blame] | 52 | } |
| 53 | |
Christoph Hellwig | 6ae0957 | 2010-02-16 03:44:49 -0500 | [diff] [blame] | 54 | static int quota_sync_all(int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | { |
Christoph Hellwig | 6ae0957 | 2010-02-16 03:44:49 -0500 | [diff] [blame] | 56 | int ret; |
| 57 | |
| 58 | if (type >= MAXQUOTAS) |
| 59 | return -EINVAL; |
| 60 | ret = security_quotactl(Q_SYNC, type, 0, NULL); |
Al Viro | 01a05b3 | 2010-03-23 06:06:58 -0400 | [diff] [blame] | 61 | if (!ret) |
| 62 | iterate_supers(quota_sync_one, &type); |
| 63 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | } |
| 65 | |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 66 | static int quota_quotaon(struct super_block *sb, int type, int cmd, qid_t id, |
Jan Kara | f00c9e4 | 2010-09-15 17:38:58 +0200 | [diff] [blame] | 67 | struct path *path) |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 68 | { |
Jan Kara | f00c9e4 | 2010-09-15 17:38:58 +0200 | [diff] [blame] | 69 | if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_on_meta) |
| 70 | return -ENOSYS; |
| 71 | if (sb->s_qcop->quota_on_meta) |
| 72 | return sb->s_qcop->quota_on_meta(sb, type, id); |
| 73 | if (IS_ERR(path)) |
| 74 | return PTR_ERR(path); |
| 75 | return sb->s_qcop->quota_on(sb, type, id, path); |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 76 | } |
| 77 | |
| 78 | static int quota_getfmt(struct super_block *sb, int type, void __user *addr) |
| 79 | { |
| 80 | __u32 fmt; |
| 81 | |
| 82 | down_read(&sb_dqopt(sb)->dqptr_sem); |
| 83 | if (!sb_has_quota_active(sb, type)) { |
| 84 | up_read(&sb_dqopt(sb)->dqptr_sem); |
| 85 | return -ESRCH; |
| 86 | } |
| 87 | fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id; |
| 88 | up_read(&sb_dqopt(sb)->dqptr_sem); |
| 89 | if (copy_to_user(addr, &fmt, sizeof(fmt))) |
| 90 | return -EFAULT; |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | static int quota_getinfo(struct super_block *sb, int type, void __user *addr) |
| 95 | { |
| 96 | struct if_dqinfo info; |
| 97 | int ret; |
| 98 | |
Christoph Hellwig | f450d4f | 2010-02-16 03:44:48 -0500 | [diff] [blame] | 99 | if (!sb->s_qcop->get_info) |
| 100 | return -ENOSYS; |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 101 | ret = sb->s_qcop->get_info(sb, type, &info); |
| 102 | if (!ret && copy_to_user(addr, &info, sizeof(info))) |
| 103 | return -EFAULT; |
| 104 | return ret; |
| 105 | } |
| 106 | |
| 107 | static int quota_setinfo(struct super_block *sb, int type, void __user *addr) |
| 108 | { |
| 109 | struct if_dqinfo info; |
| 110 | |
| 111 | if (copy_from_user(&info, addr, sizeof(info))) |
| 112 | return -EFAULT; |
Christoph Hellwig | f450d4f | 2010-02-16 03:44:48 -0500 | [diff] [blame] | 113 | if (!sb->s_qcop->set_info) |
| 114 | return -ENOSYS; |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 115 | return sb->s_qcop->set_info(sb, type, &info); |
| 116 | } |
| 117 | |
Christoph Hellwig | b9b2dd3 | 2010-05-06 17:04:58 -0400 | [diff] [blame] | 118 | static void copy_to_if_dqblk(struct if_dqblk *dst, struct fs_disk_quota *src) |
| 119 | { |
Dan Carpenter | 18da65e | 2013-11-01 13:21:54 +0300 | [diff] [blame] | 120 | memset(dst, 0, sizeof(*dst)); |
Christoph Hellwig | b9b2dd3 | 2010-05-06 17:04:58 -0400 | [diff] [blame] | 121 | dst->dqb_bhardlimit = src->d_blk_hardlimit; |
| 122 | dst->dqb_bsoftlimit = src->d_blk_softlimit; |
| 123 | dst->dqb_curspace = src->d_bcount; |
| 124 | dst->dqb_ihardlimit = src->d_ino_hardlimit; |
| 125 | dst->dqb_isoftlimit = src->d_ino_softlimit; |
| 126 | dst->dqb_curinodes = src->d_icount; |
| 127 | dst->dqb_btime = src->d_btimer; |
| 128 | dst->dqb_itime = src->d_itimer; |
| 129 | dst->dqb_valid = QIF_ALL; |
| 130 | } |
| 131 | |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 132 | static int quota_getquota(struct super_block *sb, int type, qid_t id, |
| 133 | void __user *addr) |
| 134 | { |
Eric W. Biederman | 74a8a10 | 2012-09-16 02:07:49 -0700 | [diff] [blame] | 135 | struct kqid qid; |
Christoph Hellwig | b9b2dd3 | 2010-05-06 17:04:58 -0400 | [diff] [blame] | 136 | struct fs_disk_quota fdq; |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 137 | struct if_dqblk idq; |
| 138 | int ret; |
| 139 | |
Christoph Hellwig | f450d4f | 2010-02-16 03:44:48 -0500 | [diff] [blame] | 140 | if (!sb->s_qcop->get_dqblk) |
| 141 | return -ENOSYS; |
Eric W. Biederman | 74a8a10 | 2012-09-16 02:07:49 -0700 | [diff] [blame] | 142 | qid = make_kqid(current_user_ns(), type, id); |
| 143 | if (!qid_valid(qid)) |
| 144 | return -EINVAL; |
| 145 | ret = sb->s_qcop->get_dqblk(sb, qid, &fdq); |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 146 | if (ret) |
| 147 | return ret; |
Christoph Hellwig | b9b2dd3 | 2010-05-06 17:04:58 -0400 | [diff] [blame] | 148 | copy_to_if_dqblk(&idq, &fdq); |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 149 | if (copy_to_user(addr, &idq, sizeof(idq))) |
| 150 | return -EFAULT; |
| 151 | return 0; |
| 152 | } |
| 153 | |
Christoph Hellwig | c472b43 | 2010-05-06 17:05:17 -0400 | [diff] [blame] | 154 | static void copy_from_if_dqblk(struct fs_disk_quota *dst, struct if_dqblk *src) |
| 155 | { |
| 156 | dst->d_blk_hardlimit = src->dqb_bhardlimit; |
| 157 | dst->d_blk_softlimit = src->dqb_bsoftlimit; |
| 158 | dst->d_bcount = src->dqb_curspace; |
| 159 | dst->d_ino_hardlimit = src->dqb_ihardlimit; |
| 160 | dst->d_ino_softlimit = src->dqb_isoftlimit; |
| 161 | dst->d_icount = src->dqb_curinodes; |
| 162 | dst->d_btimer = src->dqb_btime; |
| 163 | dst->d_itimer = src->dqb_itime; |
| 164 | |
| 165 | dst->d_fieldmask = 0; |
| 166 | if (src->dqb_valid & QIF_BLIMITS) |
| 167 | dst->d_fieldmask |= FS_DQ_BSOFT | FS_DQ_BHARD; |
| 168 | if (src->dqb_valid & QIF_SPACE) |
| 169 | dst->d_fieldmask |= FS_DQ_BCOUNT; |
| 170 | if (src->dqb_valid & QIF_ILIMITS) |
| 171 | dst->d_fieldmask |= FS_DQ_ISOFT | FS_DQ_IHARD; |
| 172 | if (src->dqb_valid & QIF_INODES) |
| 173 | dst->d_fieldmask |= FS_DQ_ICOUNT; |
| 174 | if (src->dqb_valid & QIF_BTIME) |
| 175 | dst->d_fieldmask |= FS_DQ_BTIMER; |
| 176 | if (src->dqb_valid & QIF_ITIME) |
| 177 | dst->d_fieldmask |= FS_DQ_ITIMER; |
| 178 | } |
| 179 | |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 180 | static int quota_setquota(struct super_block *sb, int type, qid_t id, |
| 181 | void __user *addr) |
| 182 | { |
Christoph Hellwig | c472b43 | 2010-05-06 17:05:17 -0400 | [diff] [blame] | 183 | struct fs_disk_quota fdq; |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 184 | struct if_dqblk idq; |
Eric W. Biederman | 74a8a10 | 2012-09-16 02:07:49 -0700 | [diff] [blame] | 185 | struct kqid qid; |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 186 | |
| 187 | if (copy_from_user(&idq, addr, sizeof(idq))) |
| 188 | return -EFAULT; |
Christoph Hellwig | f450d4f | 2010-02-16 03:44:48 -0500 | [diff] [blame] | 189 | if (!sb->s_qcop->set_dqblk) |
| 190 | return -ENOSYS; |
Eric W. Biederman | 74a8a10 | 2012-09-16 02:07:49 -0700 | [diff] [blame] | 191 | qid = make_kqid(current_user_ns(), type, id); |
| 192 | if (!qid_valid(qid)) |
| 193 | return -EINVAL; |
Christoph Hellwig | c472b43 | 2010-05-06 17:05:17 -0400 | [diff] [blame] | 194 | copy_from_if_dqblk(&fdq, &idq); |
Eric W. Biederman | 74a8a10 | 2012-09-16 02:07:49 -0700 | [diff] [blame] | 195 | return sb->s_qcop->set_dqblk(sb, qid, &fdq); |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 196 | } |
| 197 | |
| 198 | static int quota_setxstate(struct super_block *sb, int cmd, void __user *addr) |
| 199 | { |
| 200 | __u32 flags; |
| 201 | |
| 202 | if (copy_from_user(&flags, addr, sizeof(flags))) |
| 203 | return -EFAULT; |
Christoph Hellwig | f450d4f | 2010-02-16 03:44:48 -0500 | [diff] [blame] | 204 | if (!sb->s_qcop->set_xstate) |
| 205 | return -ENOSYS; |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 206 | return sb->s_qcop->set_xstate(sb, flags, cmd); |
| 207 | } |
| 208 | |
| 209 | static int quota_getxstate(struct super_block *sb, void __user *addr) |
| 210 | { |
| 211 | struct fs_quota_stat fqs; |
| 212 | int ret; |
Christoph Hellwig | f450d4f | 2010-02-16 03:44:48 -0500 | [diff] [blame] | 213 | |
| 214 | if (!sb->s_qcop->get_xstate) |
| 215 | return -ENOSYS; |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 216 | ret = sb->s_qcop->get_xstate(sb, &fqs); |
| 217 | if (!ret && copy_to_user(addr, &fqs, sizeof(fqs))) |
| 218 | return -EFAULT; |
| 219 | return ret; |
| 220 | } |
| 221 | |
Chandra Seetharaman | af30cb4 | 2013-08-06 17:27:07 -0500 | [diff] [blame] | 222 | static int quota_getxstatev(struct super_block *sb, void __user *addr) |
| 223 | { |
| 224 | struct fs_quota_statv fqs; |
| 225 | int ret; |
| 226 | |
| 227 | if (!sb->s_qcop->get_xstatev) |
| 228 | return -ENOSYS; |
| 229 | |
| 230 | memset(&fqs, 0, sizeof(fqs)); |
| 231 | if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */ |
| 232 | return -EFAULT; |
| 233 | |
| 234 | /* If this kernel doesn't support user specified version, fail */ |
| 235 | switch (fqs.qs_version) { |
| 236 | case FS_QSTATV_VERSION1: |
| 237 | break; |
| 238 | default: |
| 239 | return -EINVAL; |
| 240 | } |
| 241 | ret = sb->s_qcop->get_xstatev(sb, &fqs); |
| 242 | if (!ret && copy_to_user(addr, &fqs, sizeof(fqs))) |
| 243 | return -EFAULT; |
| 244 | return ret; |
| 245 | } |
| 246 | |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 247 | static int quota_setxquota(struct super_block *sb, int type, qid_t id, |
| 248 | void __user *addr) |
| 249 | { |
| 250 | struct fs_disk_quota fdq; |
Eric W. Biederman | 74a8a10 | 2012-09-16 02:07:49 -0700 | [diff] [blame] | 251 | struct kqid qid; |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 252 | |
| 253 | if (copy_from_user(&fdq, addr, sizeof(fdq))) |
| 254 | return -EFAULT; |
Christoph Hellwig | c472b43 | 2010-05-06 17:05:17 -0400 | [diff] [blame] | 255 | if (!sb->s_qcop->set_dqblk) |
Christoph Hellwig | f450d4f | 2010-02-16 03:44:48 -0500 | [diff] [blame] | 256 | return -ENOSYS; |
Eric W. Biederman | 74a8a10 | 2012-09-16 02:07:49 -0700 | [diff] [blame] | 257 | qid = make_kqid(current_user_ns(), type, id); |
| 258 | if (!qid_valid(qid)) |
| 259 | return -EINVAL; |
| 260 | return sb->s_qcop->set_dqblk(sb, qid, &fdq); |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | static int quota_getxquota(struct super_block *sb, int type, qid_t id, |
| 264 | void __user *addr) |
| 265 | { |
| 266 | struct fs_disk_quota fdq; |
Eric W. Biederman | 74a8a10 | 2012-09-16 02:07:49 -0700 | [diff] [blame] | 267 | struct kqid qid; |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 268 | int ret; |
| 269 | |
Christoph Hellwig | b9b2dd3 | 2010-05-06 17:04:58 -0400 | [diff] [blame] | 270 | if (!sb->s_qcop->get_dqblk) |
Christoph Hellwig | f450d4f | 2010-02-16 03:44:48 -0500 | [diff] [blame] | 271 | return -ENOSYS; |
Eric W. Biederman | 74a8a10 | 2012-09-16 02:07:49 -0700 | [diff] [blame] | 272 | qid = make_kqid(current_user_ns(), type, id); |
| 273 | if (!qid_valid(qid)) |
| 274 | return -EINVAL; |
| 275 | ret = sb->s_qcop->get_dqblk(sb, qid, &fdq); |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 276 | if (!ret && copy_to_user(addr, &fdq, sizeof(fdq))) |
| 277 | return -EFAULT; |
| 278 | return ret; |
| 279 | } |
| 280 | |
Eric Sandeen | 9da93f9 | 2014-05-05 17:25:50 +1000 | [diff] [blame] | 281 | static int quota_rmxquota(struct super_block *sb, void __user *addr) |
| 282 | { |
| 283 | __u32 flags; |
| 284 | |
| 285 | if (copy_from_user(&flags, addr, sizeof(flags))) |
| 286 | return -EFAULT; |
| 287 | if (!sb->s_qcop->rm_xquota) |
| 288 | return -ENOSYS; |
| 289 | return sb->s_qcop->rm_xquota(sb, flags); |
| 290 | } |
| 291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | /* Copy parameters and call proper function */ |
Jan Kara | 268157b | 2009-01-27 15:47:22 +0100 | [diff] [blame] | 293 | static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, |
Jan Kara | f00c9e4 | 2010-09-15 17:38:58 +0200 | [diff] [blame] | 294 | void __user *addr, struct path *path) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | { |
Christoph Hellwig | c988afb | 2010-02-16 03:44:50 -0500 | [diff] [blame] | 296 | int ret; |
| 297 | |
| 298 | if (type >= (XQM_COMMAND(cmd) ? XQM_MAXQUOTAS : MAXQUOTAS)) |
| 299 | return -EINVAL; |
| 300 | if (!sb->s_qcop) |
| 301 | return -ENOSYS; |
| 302 | |
| 303 | ret = check_quotactl_permission(sb, type, cmd, id); |
| 304 | if (ret < 0) |
| 305 | return ret; |
| 306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | switch (cmd) { |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 308 | case Q_QUOTAON: |
Jan Kara | f00c9e4 | 2010-09-15 17:38:58 +0200 | [diff] [blame] | 309 | return quota_quotaon(sb, type, cmd, id, path); |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 310 | case Q_QUOTAOFF: |
Christoph Hellwig | f450d4f | 2010-02-16 03:44:48 -0500 | [diff] [blame] | 311 | if (!sb->s_qcop->quota_off) |
| 312 | return -ENOSYS; |
Christoph Hellwig | 307ae18 | 2010-05-19 07:16:43 -0400 | [diff] [blame] | 313 | return sb->s_qcop->quota_off(sb, type); |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 314 | case Q_GETFMT: |
| 315 | return quota_getfmt(sb, type, addr); |
| 316 | case Q_GETINFO: |
| 317 | return quota_getinfo(sb, type, addr); |
| 318 | case Q_SETINFO: |
| 319 | return quota_setinfo(sb, type, addr); |
| 320 | case Q_GETQUOTA: |
| 321 | return quota_getquota(sb, type, id, addr); |
| 322 | case Q_SETQUOTA: |
| 323 | return quota_setquota(sb, type, id, addr); |
| 324 | case Q_SYNC: |
Christoph Hellwig | 6ae0957 | 2010-02-16 03:44:49 -0500 | [diff] [blame] | 325 | if (!sb->s_qcop->quota_sync) |
| 326 | return -ENOSYS; |
Jan Kara | ceed172 | 2012-07-03 16:45:28 +0200 | [diff] [blame] | 327 | return sb->s_qcop->quota_sync(sb, type); |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 328 | case Q_XQUOTAON: |
| 329 | case Q_XQUOTAOFF: |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 330 | return quota_setxstate(sb, cmd, addr); |
Eric Sandeen | 9da93f9 | 2014-05-05 17:25:50 +1000 | [diff] [blame] | 331 | case Q_XQUOTARM: |
| 332 | return quota_rmxquota(sb, addr); |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 333 | case Q_XGETQSTAT: |
| 334 | return quota_getxstate(sb, addr); |
Chandra Seetharaman | af30cb4 | 2013-08-06 17:27:07 -0500 | [diff] [blame] | 335 | case Q_XGETQSTATV: |
| 336 | return quota_getxstatev(sb, addr); |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 337 | case Q_XSETQLIM: |
| 338 | return quota_setxquota(sb, type, id, addr); |
| 339 | case Q_XGETQUOTA: |
| 340 | return quota_getxquota(sb, type, id, addr); |
| 341 | case Q_XQUOTASYNC: |
Christoph Hellwig | 8c4e4ac | 2010-02-16 03:44:51 -0500 | [diff] [blame] | 342 | if (sb->s_flags & MS_RDONLY) |
| 343 | return -EROFS; |
Christoph Hellwig | 4b217ed | 2012-02-20 02:28:18 +0000 | [diff] [blame] | 344 | /* XFS quotas are fully coherent now, making this call a noop */ |
Christoph Hellwig | 8c4e4ac | 2010-02-16 03:44:51 -0500 | [diff] [blame] | 345 | return 0; |
Christoph Hellwig | c411e5f | 2010-02-16 03:44:47 -0500 | [diff] [blame] | 346 | default: |
Christoph Hellwig | f450d4f | 2010-02-16 03:44:48 -0500 | [diff] [blame] | 347 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | } |
| 350 | |
Lee Jones | 56df127 | 2012-11-03 23:02:28 +0100 | [diff] [blame] | 351 | #ifdef CONFIG_BLOCK |
| 352 | |
Jan Kara | dcdbed8 | 2012-02-10 11:03:01 +0100 | [diff] [blame] | 353 | /* Return 1 if 'cmd' will block on frozen filesystem */ |
| 354 | static int quotactl_cmd_write(int cmd) |
| 355 | { |
| 356 | switch (cmd) { |
| 357 | case Q_GETFMT: |
| 358 | case Q_GETINFO: |
| 359 | case Q_SYNC: |
| 360 | case Q_XGETQSTAT: |
Chandra Seetharaman | af30cb4 | 2013-08-06 17:27:07 -0500 | [diff] [blame] | 361 | case Q_XGETQSTATV: |
Jan Kara | dcdbed8 | 2012-02-10 11:03:01 +0100 | [diff] [blame] | 362 | case Q_XGETQUOTA: |
| 363 | case Q_XQUOTASYNC: |
| 364 | return 0; |
| 365 | } |
| 366 | return 1; |
| 367 | } |
| 368 | |
Lee Jones | 56df127 | 2012-11-03 23:02:28 +0100 | [diff] [blame] | 369 | #endif /* CONFIG_BLOCK */ |
| 370 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | /* |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 372 | * look up a superblock on which quota ops will be performed |
| 373 | * - use the name of a block device to find the superblock thereon |
| 374 | */ |
Jan Kara | dcdbed8 | 2012-02-10 11:03:01 +0100 | [diff] [blame] | 375 | static struct super_block *quotactl_block(const char __user *special, int cmd) |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 376 | { |
| 377 | #ifdef CONFIG_BLOCK |
| 378 | struct block_device *bdev; |
| 379 | struct super_block *sb; |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 380 | struct filename *tmp = getname(special); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 381 | |
| 382 | if (IS_ERR(tmp)) |
David Howells | e231c2e | 2008-02-07 00:15:26 -0800 | [diff] [blame] | 383 | return ERR_CAST(tmp); |
Jeff Layton | 91a27b2 | 2012-10-10 15:25:28 -0400 | [diff] [blame] | 384 | bdev = lookup_bdev(tmp->name); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 385 | putname(tmp); |
| 386 | if (IS_ERR(bdev)) |
David Howells | e231c2e | 2008-02-07 00:15:26 -0800 | [diff] [blame] | 387 | return ERR_CAST(bdev); |
Jan Kara | dcdbed8 | 2012-02-10 11:03:01 +0100 | [diff] [blame] | 388 | if (quotactl_cmd_write(cmd)) |
| 389 | sb = get_super_thawed(bdev); |
| 390 | else |
| 391 | sb = get_super(bdev); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 392 | bdput(bdev); |
| 393 | if (!sb) |
| 394 | return ERR_PTR(-ENODEV); |
| 395 | |
| 396 | return sb; |
| 397 | #else |
| 398 | return ERR_PTR(-ENODEV); |
| 399 | #endif |
| 400 | } |
| 401 | |
| 402 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | * This is the system call interface. This communicates with |
| 404 | * the user-level programs. Currently this only supports diskquota |
| 405 | * calls. Maybe we need to add the process quotas etc. in the future, |
| 406 | * but we probably should use rlimits for that. |
| 407 | */ |
Heiko Carstens | 3cdad42 | 2009-01-14 14:14:22 +0100 | [diff] [blame] | 408 | SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special, |
| 409 | qid_t, id, void __user *, addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | { |
| 411 | uint cmds, type; |
| 412 | struct super_block *sb = NULL; |
Jan Kara | f00c9e4 | 2010-09-15 17:38:58 +0200 | [diff] [blame] | 413 | struct path path, *pathp = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | int ret; |
| 415 | |
| 416 | cmds = cmd >> SUBCMDSHIFT; |
| 417 | type = cmd & SUBCMDMASK; |
| 418 | |
Christoph Hellwig | 6ae0957 | 2010-02-16 03:44:49 -0500 | [diff] [blame] | 419 | /* |
| 420 | * As a special case Q_SYNC can be called without a specific device. |
| 421 | * It will iterate all superblocks that have quota enabled and call |
| 422 | * the sync action on each of them. |
| 423 | */ |
| 424 | if (!special) { |
| 425 | if (cmds == Q_SYNC) |
| 426 | return quota_sync_all(type); |
| 427 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | } |
| 429 | |
Jan Kara | f00c9e4 | 2010-09-15 17:38:58 +0200 | [diff] [blame] | 430 | /* |
| 431 | * Path for quotaon has to be resolved before grabbing superblock |
| 432 | * because that gets s_umount sem which is also possibly needed by path |
| 433 | * resolution (think about autofs) and thus deadlocks could arise. |
| 434 | */ |
| 435 | if (cmds == Q_QUOTAON) { |
Trond Myklebust | 815d405 | 2011-09-26 20:36:09 -0400 | [diff] [blame] | 436 | ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path); |
Jan Kara | f00c9e4 | 2010-09-15 17:38:58 +0200 | [diff] [blame] | 437 | if (ret) |
| 438 | pathp = ERR_PTR(ret); |
| 439 | else |
| 440 | pathp = &path; |
| 441 | } |
| 442 | |
Jan Kara | dcdbed8 | 2012-02-10 11:03:01 +0100 | [diff] [blame] | 443 | sb = quotactl_block(special, cmds); |
Jan Kara | 0aaa618 | 2011-10-10 18:32:06 +0200 | [diff] [blame] | 444 | if (IS_ERR(sb)) { |
| 445 | ret = PTR_ERR(sb); |
| 446 | goto out; |
| 447 | } |
Christoph Hellwig | 6ae0957 | 2010-02-16 03:44:49 -0500 | [diff] [blame] | 448 | |
Jan Kara | f00c9e4 | 2010-09-15 17:38:58 +0200 | [diff] [blame] | 449 | ret = do_quotactl(sb, type, cmds, id, addr, pathp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
Christoph Hellwig | 6ae0957 | 2010-02-16 03:44:49 -0500 | [diff] [blame] | 451 | drop_super(sb); |
Jan Kara | 0aaa618 | 2011-10-10 18:32:06 +0200 | [diff] [blame] | 452 | out: |
Jan Kara | f00c9e4 | 2010-09-15 17:38:58 +0200 | [diff] [blame] | 453 | if (pathp && !IS_ERR(pathp)) |
| 454 | path_put(pathp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | return ret; |
| 456 | } |