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.
9 #include <linux/namei.h>
10 #include <linux/slab.h>
11 #include <asm/current.h>
12 #include <linux/uaccess.h>
13 #include <linux/kernel.h>
14 #include <linux/security.h>
15 #include <linux/syscalls.h>
16 #include <linux/capability.h>
17 #include <linux/quotaops.h>
18 #include <linux/types.h>
19 #include <linux/writeback.h>
21 static int check_quotactl_permission(struct super_block *sb, int type, int cmd,
25 /* these commands do not require any special privilegues */
33 /* allow to query information for dquots we "own" */
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))))
41 if (!capable(CAP_SYS_ADMIN))
45 return security_quotactl(cmd, type, id, sb);
48 static void quota_sync_one(struct super_block *sb, void *arg)
50 int type = *(int *)arg;
52 if (sb->s_qcop && sb->s_qcop->quota_sync &&
53 (sb->s_quota_types & (1 << type)))
54 sb->s_qcop->quota_sync(sb, type);
57 static int quota_sync_all(int type)
61 if (type >= MAXQUOTAS)
63 ret = security_quotactl(Q_SYNC, type, 0, NULL);
65 iterate_supers(quota_sync_one, &type);
69 unsigned int qtype_enforce_flag(int type)
73 return FS_QUOTA_UDQ_ENFD;
75 return FS_QUOTA_GDQ_ENFD;
77 return FS_QUOTA_PDQ_ENFD;
82 static int quota_quotaon(struct super_block *sb, int type, int cmd, qid_t id,
85 if (!sb->s_qcop->quota_on && !sb->s_qcop->quota_enable)
87 if (sb->s_qcop->quota_enable)
88 return sb->s_qcop->quota_enable(sb, qtype_enforce_flag(type));
91 return sb->s_qcop->quota_on(sb, type, id, path);
94 static int quota_quotaoff(struct super_block *sb, int type)
96 if (!sb->s_qcop->quota_off && !sb->s_qcop->quota_disable)
98 if (sb->s_qcop->quota_disable)
99 return sb->s_qcop->quota_disable(sb, qtype_enforce_flag(type));
100 return sb->s_qcop->quota_off(sb, type);
103 static int quota_getfmt(struct super_block *sb, int type, void __user *addr)
107 mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
108 if (!sb_has_quota_active(sb, type)) {
109 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
112 fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
113 mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
114 if (copy_to_user(addr, &fmt, sizeof(fmt)))
119 static int quota_getinfo(struct super_block *sb, int type, void __user *addr)
121 struct if_dqinfo info;
124 if (!sb->s_qcop->get_info)
126 ret = sb->s_qcop->get_info(sb, type, &info);
127 if (!ret && copy_to_user(addr, &info, sizeof(info)))
132 static int quota_setinfo(struct super_block *sb, int type, void __user *addr)
134 struct if_dqinfo info;
136 if (copy_from_user(&info, addr, sizeof(info)))
138 if (!sb->s_qcop->set_info)
140 return sb->s_qcop->set_info(sb, type, &info);
143 static inline qsize_t qbtos(qsize_t blocks)
145 return blocks << QIF_DQBLKSIZE_BITS;
148 static inline qsize_t stoqb(qsize_t space)
150 return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
153 static void copy_to_if_dqblk(struct if_dqblk *dst, struct qc_dqblk *src)
155 memset(dst, 0, sizeof(*dst));
156 dst->dqb_bhardlimit = stoqb(src->d_spc_hardlimit);
157 dst->dqb_bsoftlimit = stoqb(src->d_spc_softlimit);
158 dst->dqb_curspace = src->d_space;
159 dst->dqb_ihardlimit = src->d_ino_hardlimit;
160 dst->dqb_isoftlimit = src->d_ino_softlimit;
161 dst->dqb_curinodes = src->d_ino_count;
162 dst->dqb_btime = src->d_spc_timer;
163 dst->dqb_itime = src->d_ino_timer;
164 dst->dqb_valid = QIF_ALL;
167 static int quota_getquota(struct super_block *sb, int type, qid_t id,
175 if (!sb->s_qcop->get_dqblk)
177 qid = make_kqid(current_user_ns(), type, id);
180 ret = sb->s_qcop->get_dqblk(sb, qid, &fdq);
183 copy_to_if_dqblk(&idq, &fdq);
184 if (copy_to_user(addr, &idq, sizeof(idq)))
189 static void copy_from_if_dqblk(struct qc_dqblk *dst, struct if_dqblk *src)
191 dst->d_spc_hardlimit = qbtos(src->dqb_bhardlimit);
192 dst->d_spc_softlimit = qbtos(src->dqb_bsoftlimit);
193 dst->d_space = src->dqb_curspace;
194 dst->d_ino_hardlimit = src->dqb_ihardlimit;
195 dst->d_ino_softlimit = src->dqb_isoftlimit;
196 dst->d_ino_count = src->dqb_curinodes;
197 dst->d_spc_timer = src->dqb_btime;
198 dst->d_ino_timer = src->dqb_itime;
200 dst->d_fieldmask = 0;
201 if (src->dqb_valid & QIF_BLIMITS)
202 dst->d_fieldmask |= QC_SPC_SOFT | QC_SPC_HARD;
203 if (src->dqb_valid & QIF_SPACE)
204 dst->d_fieldmask |= QC_SPACE;
205 if (src->dqb_valid & QIF_ILIMITS)
206 dst->d_fieldmask |= QC_INO_SOFT | QC_INO_HARD;
207 if (src->dqb_valid & QIF_INODES)
208 dst->d_fieldmask |= QC_INO_COUNT;
209 if (src->dqb_valid & QIF_BTIME)
210 dst->d_fieldmask |= QC_SPC_TIMER;
211 if (src->dqb_valid & QIF_ITIME)
212 dst->d_fieldmask |= QC_INO_TIMER;
215 static int quota_setquota(struct super_block *sb, int type, qid_t id,
222 if (copy_from_user(&idq, addr, sizeof(idq)))
224 if (!sb->s_qcop->set_dqblk)
226 qid = make_kqid(current_user_ns(), type, id);
229 copy_from_if_dqblk(&fdq, &idq);
230 return sb->s_qcop->set_dqblk(sb, qid, &fdq);
233 static int quota_enable(struct super_block *sb, void __user *addr)
237 if (copy_from_user(&flags, addr, sizeof(flags)))
239 if (!sb->s_qcop->quota_enable)
241 return sb->s_qcop->quota_enable(sb, flags);
244 static int quota_disable(struct super_block *sb, void __user *addr)
248 if (copy_from_user(&flags, addr, sizeof(flags)))
250 if (!sb->s_qcop->quota_disable)
252 return sb->s_qcop->quota_disable(sb, flags);
255 static int quota_getxstate(struct super_block *sb, void __user *addr)
257 struct fs_quota_stat fqs;
260 if (!sb->s_qcop->get_xstate)
262 ret = sb->s_qcop->get_xstate(sb, &fqs);
263 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
268 static int quota_getxstatev(struct super_block *sb, void __user *addr)
270 struct fs_quota_statv fqs;
273 if (!sb->s_qcop->get_xstatev)
276 memset(&fqs, 0, sizeof(fqs));
277 if (copy_from_user(&fqs, addr, 1)) /* Just read qs_version */
280 /* If this kernel doesn't support user specified version, fail */
281 switch (fqs.qs_version) {
282 case FS_QSTATV_VERSION1:
287 ret = sb->s_qcop->get_xstatev(sb, &fqs);
288 if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
294 * XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them
295 * out of there as xfsprogs rely on definitions being in that header file. So
296 * just define same functions here for quota purposes.
298 #define XFS_BB_SHIFT 9
300 static inline u64 quota_bbtob(u64 blocks)
302 return blocks << XFS_BB_SHIFT;
305 static inline u64 quota_btobb(u64 bytes)
307 return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT;
310 static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src)
312 dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit);
313 dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit);
314 dst->d_ino_hardlimit = src->d_ino_hardlimit;
315 dst->d_ino_softlimit = src->d_ino_softlimit;
316 dst->d_space = quota_bbtob(src->d_bcount);
317 dst->d_ino_count = src->d_icount;
318 dst->d_ino_timer = src->d_itimer;
319 dst->d_spc_timer = src->d_btimer;
320 dst->d_ino_warns = src->d_iwarns;
321 dst->d_spc_warns = src->d_bwarns;
322 dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit);
323 dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit);
324 dst->d_rt_space = quota_bbtob(src->d_rtbcount);
325 dst->d_rt_spc_timer = src->d_rtbtimer;
326 dst->d_rt_spc_warns = src->d_rtbwarns;
327 dst->d_fieldmask = 0;
328 if (src->d_fieldmask & FS_DQ_ISOFT)
329 dst->d_fieldmask |= QC_INO_SOFT;
330 if (src->d_fieldmask & FS_DQ_IHARD)
331 dst->d_fieldmask |= QC_INO_HARD;
332 if (src->d_fieldmask & FS_DQ_BSOFT)
333 dst->d_fieldmask |= QC_SPC_SOFT;
334 if (src->d_fieldmask & FS_DQ_BHARD)
335 dst->d_fieldmask |= QC_SPC_HARD;
336 if (src->d_fieldmask & FS_DQ_RTBSOFT)
337 dst->d_fieldmask |= QC_RT_SPC_SOFT;
338 if (src->d_fieldmask & FS_DQ_RTBHARD)
339 dst->d_fieldmask |= QC_RT_SPC_HARD;
340 if (src->d_fieldmask & FS_DQ_BTIMER)
341 dst->d_fieldmask |= QC_SPC_TIMER;
342 if (src->d_fieldmask & FS_DQ_ITIMER)
343 dst->d_fieldmask |= QC_INO_TIMER;
344 if (src->d_fieldmask & FS_DQ_RTBTIMER)
345 dst->d_fieldmask |= QC_RT_SPC_TIMER;
346 if (src->d_fieldmask & FS_DQ_BWARNS)
347 dst->d_fieldmask |= QC_SPC_WARNS;
348 if (src->d_fieldmask & FS_DQ_IWARNS)
349 dst->d_fieldmask |= QC_INO_WARNS;
350 if (src->d_fieldmask & FS_DQ_RTBWARNS)
351 dst->d_fieldmask |= QC_RT_SPC_WARNS;
352 if (src->d_fieldmask & FS_DQ_BCOUNT)
353 dst->d_fieldmask |= QC_SPACE;
354 if (src->d_fieldmask & FS_DQ_ICOUNT)
355 dst->d_fieldmask |= QC_INO_COUNT;
356 if (src->d_fieldmask & FS_DQ_RTBCOUNT)
357 dst->d_fieldmask |= QC_RT_SPACE;
360 static int quota_setxquota(struct super_block *sb, int type, qid_t id,
363 struct fs_disk_quota fdq;
367 if (copy_from_user(&fdq, addr, sizeof(fdq)))
369 if (!sb->s_qcop->set_dqblk)
371 qid = make_kqid(current_user_ns(), type, id);
374 copy_from_xfs_dqblk(&qdq, &fdq);
375 return sb->s_qcop->set_dqblk(sb, qid, &qdq);
378 static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src,
381 memset(dst, 0, sizeof(*dst));
382 dst->d_version = FS_DQUOT_VERSION;
384 if (type == USRQUOTA)
385 dst->d_flags = FS_USER_QUOTA;
386 else if (type == PRJQUOTA)
387 dst->d_flags = FS_PROJ_QUOTA;
389 dst->d_flags = FS_GROUP_QUOTA;
390 dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit);
391 dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit);
392 dst->d_ino_hardlimit = src->d_ino_hardlimit;
393 dst->d_ino_softlimit = src->d_ino_softlimit;
394 dst->d_bcount = quota_btobb(src->d_space);
395 dst->d_icount = src->d_ino_count;
396 dst->d_itimer = src->d_ino_timer;
397 dst->d_btimer = src->d_spc_timer;
398 dst->d_iwarns = src->d_ino_warns;
399 dst->d_bwarns = src->d_spc_warns;
400 dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit);
401 dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit);
402 dst->d_rtbcount = quota_btobb(src->d_rt_space);
403 dst->d_rtbtimer = src->d_rt_spc_timer;
404 dst->d_rtbwarns = src->d_rt_spc_warns;
407 static int quota_getxquota(struct super_block *sb, int type, qid_t id,
410 struct fs_disk_quota fdq;
415 if (!sb->s_qcop->get_dqblk)
417 qid = make_kqid(current_user_ns(), type, id);
420 ret = sb->s_qcop->get_dqblk(sb, qid, &qdq);
423 copy_to_xfs_dqblk(&fdq, &qdq, type, id);
424 if (copy_to_user(addr, &fdq, sizeof(fdq)))
429 static int quota_rmxquota(struct super_block *sb, void __user *addr)
433 if (copy_from_user(&flags, addr, sizeof(flags)))
435 if (!sb->s_qcop->rm_xquota)
437 return sb->s_qcop->rm_xquota(sb, flags);
440 /* Copy parameters and call proper function */
441 static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
442 void __user *addr, struct path *path)
446 if (type >= (XQM_COMMAND(cmd) ? XQM_MAXQUOTAS : MAXQUOTAS))
449 * Quota not supported on this fs? Check this before s_quota_types
450 * since they needn't be set if quota is not supported at all.
454 if (!(sb->s_quota_types & (1 << type)))
457 ret = check_quotactl_permission(sb, type, cmd, id);
463 return quota_quotaon(sb, type, cmd, id, path);
465 return quota_quotaoff(sb, type);
467 return quota_getfmt(sb, type, addr);
469 return quota_getinfo(sb, type, addr);
471 return quota_setinfo(sb, type, addr);
473 return quota_getquota(sb, type, id, addr);
475 return quota_setquota(sb, type, id, addr);
477 if (!sb->s_qcop->quota_sync)
479 return sb->s_qcop->quota_sync(sb, type);
481 return quota_enable(sb, addr);
483 return quota_disable(sb, addr);
485 return quota_rmxquota(sb, addr);
487 return quota_getxstate(sb, addr);
489 return quota_getxstatev(sb, addr);
491 return quota_setxquota(sb, type, id, addr);
493 return quota_getxquota(sb, type, id, addr);
495 if (sb->s_flags & MS_RDONLY)
497 /* XFS quotas are fully coherent now, making this call a noop */
506 /* Return 1 if 'cmd' will block on frozen filesystem */
507 static int quotactl_cmd_write(int cmd)
522 #endif /* CONFIG_BLOCK */
525 * look up a superblock on which quota ops will be performed
526 * - use the name of a block device to find the superblock thereon
528 static struct super_block *quotactl_block(const char __user *special, int cmd)
531 struct block_device *bdev;
532 struct super_block *sb;
533 struct filename *tmp = getname(special);
536 return ERR_CAST(tmp);
537 bdev = lookup_bdev(tmp->name);
540 return ERR_CAST(bdev);
541 if (quotactl_cmd_write(cmd))
542 sb = get_super_thawed(bdev);
544 sb = get_super(bdev);
547 return ERR_PTR(-ENODEV);
551 return ERR_PTR(-ENODEV);
556 * This is the system call interface. This communicates with
557 * the user-level programs. Currently this only supports diskquota
558 * calls. Maybe we need to add the process quotas etc. in the future,
559 * but we probably should use rlimits for that.
561 SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
562 qid_t, id, void __user *, addr)
565 struct super_block *sb = NULL;
566 struct path path, *pathp = NULL;
569 cmds = cmd >> SUBCMDSHIFT;
570 type = cmd & SUBCMDMASK;
573 * As a special case Q_SYNC can be called without a specific device.
574 * It will iterate all superblocks that have quota enabled and call
575 * the sync action on each of them.
579 return quota_sync_all(type);
584 * Path for quotaon has to be resolved before grabbing superblock
585 * because that gets s_umount sem which is also possibly needed by path
586 * resolution (think about autofs) and thus deadlocks could arise.
588 if (cmds == Q_QUOTAON) {
589 ret = user_path_at(AT_FDCWD, addr, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path);
591 pathp = ERR_PTR(ret);
596 sb = quotactl_block(special, cmds);
602 ret = do_quotactl(sb, type, cmds, id, addr, pathp);
606 if (pathp && !IS_ERR(pathp))