]>
git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - fs/quota/quota.c
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
, qid_t id
,
83 const struct path
*path
)
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 if (!sb_has_quota_active(sb
, type
))
109 fmt
= sb_dqopt(sb
)->info
[type
].dqi_format
->qf_fmt_id
;
110 if (copy_to_user(addr
, &fmt
, sizeof(fmt
)))
115 static int quota_getinfo(struct super_block
*sb
, int type
, void __user
*addr
)
117 struct qc_state state
;
118 struct qc_type_state
*tstate
;
119 struct if_dqinfo uinfo
;
122 /* This checks whether qc_state has enough entries... */
123 BUILD_BUG_ON(MAXQUOTAS
> XQM_MAXQUOTAS
);
124 if (!sb
->s_qcop
->get_state
)
126 ret
= sb
->s_qcop
->get_state(sb
, &state
);
129 tstate
= state
.s_state
+ type
;
130 if (!(tstate
->flags
& QCI_ACCT_ENABLED
))
132 memset(&uinfo
, 0, sizeof(uinfo
));
133 uinfo
.dqi_bgrace
= tstate
->spc_timelimit
;
134 uinfo
.dqi_igrace
= tstate
->ino_timelimit
;
135 if (tstate
->flags
& QCI_SYSFILE
)
136 uinfo
.dqi_flags
|= DQF_SYS_FILE
;
137 if (tstate
->flags
& QCI_ROOT_SQUASH
)
138 uinfo
.dqi_flags
|= DQF_ROOT_SQUASH
;
139 uinfo
.dqi_valid
= IIF_ALL
;
140 if (copy_to_user(addr
, &uinfo
, sizeof(uinfo
)))
145 static int quota_setinfo(struct super_block
*sb
, int type
, void __user
*addr
)
147 struct if_dqinfo info
;
148 struct qc_info qinfo
;
150 if (copy_from_user(&info
, addr
, sizeof(info
)))
152 if (!sb
->s_qcop
->set_info
)
154 if (info
.dqi_valid
& ~(IIF_FLAGS
| IIF_BGRACE
| IIF_IGRACE
))
156 memset(&qinfo
, 0, sizeof(qinfo
));
157 if (info
.dqi_valid
& IIF_FLAGS
) {
158 if (info
.dqi_flags
& ~DQF_SETINFO_MASK
)
160 if (info
.dqi_flags
& DQF_ROOT_SQUASH
)
161 qinfo
.i_flags
|= QCI_ROOT_SQUASH
;
162 qinfo
.i_fieldmask
|= QC_FLAGS
;
164 if (info
.dqi_valid
& IIF_BGRACE
) {
165 qinfo
.i_spc_timelimit
= info
.dqi_bgrace
;
166 qinfo
.i_fieldmask
|= QC_SPC_TIMER
;
168 if (info
.dqi_valid
& IIF_IGRACE
) {
169 qinfo
.i_ino_timelimit
= info
.dqi_igrace
;
170 qinfo
.i_fieldmask
|= QC_INO_TIMER
;
172 return sb
->s_qcop
->set_info(sb
, type
, &qinfo
);
175 static inline qsize_t
qbtos(qsize_t blocks
)
177 return blocks
<< QIF_DQBLKSIZE_BITS
;
180 static inline qsize_t
stoqb(qsize_t space
)
182 return (space
+ QIF_DQBLKSIZE
- 1) >> QIF_DQBLKSIZE_BITS
;
185 static void copy_to_if_dqblk(struct if_dqblk
*dst
, struct qc_dqblk
*src
)
187 memset(dst
, 0, sizeof(*dst
));
188 dst
->dqb_bhardlimit
= stoqb(src
->d_spc_hardlimit
);
189 dst
->dqb_bsoftlimit
= stoqb(src
->d_spc_softlimit
);
190 dst
->dqb_curspace
= src
->d_space
;
191 dst
->dqb_ihardlimit
= src
->d_ino_hardlimit
;
192 dst
->dqb_isoftlimit
= src
->d_ino_softlimit
;
193 dst
->dqb_curinodes
= src
->d_ino_count
;
194 dst
->dqb_btime
= src
->d_spc_timer
;
195 dst
->dqb_itime
= src
->d_ino_timer
;
196 dst
->dqb_valid
= QIF_ALL
;
199 static int quota_getquota(struct super_block
*sb
, int type
, qid_t id
,
207 if (!sb
->s_qcop
->get_dqblk
)
209 qid
= make_kqid(current_user_ns(), type
, id
);
210 if (!qid_has_mapping(sb
->s_user_ns
, qid
))
212 ret
= sb
->s_qcop
->get_dqblk(sb
, qid
, &fdq
);
215 copy_to_if_dqblk(&idq
, &fdq
);
216 if (copy_to_user(addr
, &idq
, sizeof(idq
)))
222 * Return quota for next active quota >= this id, if any exists,
223 * otherwise return -ENOENT via ->get_nextdqblk
225 static int quota_getnextquota(struct super_block
*sb
, int type
, qid_t id
,
230 struct if_nextdqblk idq
;
233 if (!sb
->s_qcop
->get_nextdqblk
)
235 qid
= make_kqid(current_user_ns(), type
, id
);
236 if (!qid_has_mapping(sb
->s_user_ns
, qid
))
238 ret
= sb
->s_qcop
->get_nextdqblk(sb
, &qid
, &fdq
);
241 /* struct if_nextdqblk is a superset of struct if_dqblk */
242 copy_to_if_dqblk((struct if_dqblk
*)&idq
, &fdq
);
243 idq
.dqb_id
= from_kqid(current_user_ns(), qid
);
244 if (copy_to_user(addr
, &idq
, sizeof(idq
)))
249 static void copy_from_if_dqblk(struct qc_dqblk
*dst
, struct if_dqblk
*src
)
251 dst
->d_spc_hardlimit
= qbtos(src
->dqb_bhardlimit
);
252 dst
->d_spc_softlimit
= qbtos(src
->dqb_bsoftlimit
);
253 dst
->d_space
= src
->dqb_curspace
;
254 dst
->d_ino_hardlimit
= src
->dqb_ihardlimit
;
255 dst
->d_ino_softlimit
= src
->dqb_isoftlimit
;
256 dst
->d_ino_count
= src
->dqb_curinodes
;
257 dst
->d_spc_timer
= src
->dqb_btime
;
258 dst
->d_ino_timer
= src
->dqb_itime
;
260 dst
->d_fieldmask
= 0;
261 if (src
->dqb_valid
& QIF_BLIMITS
)
262 dst
->d_fieldmask
|= QC_SPC_SOFT
| QC_SPC_HARD
;
263 if (src
->dqb_valid
& QIF_SPACE
)
264 dst
->d_fieldmask
|= QC_SPACE
;
265 if (src
->dqb_valid
& QIF_ILIMITS
)
266 dst
->d_fieldmask
|= QC_INO_SOFT
| QC_INO_HARD
;
267 if (src
->dqb_valid
& QIF_INODES
)
268 dst
->d_fieldmask
|= QC_INO_COUNT
;
269 if (src
->dqb_valid
& QIF_BTIME
)
270 dst
->d_fieldmask
|= QC_SPC_TIMER
;
271 if (src
->dqb_valid
& QIF_ITIME
)
272 dst
->d_fieldmask
|= QC_INO_TIMER
;
275 static int quota_setquota(struct super_block
*sb
, int type
, qid_t id
,
282 if (copy_from_user(&idq
, addr
, sizeof(idq
)))
284 if (!sb
->s_qcop
->set_dqblk
)
286 qid
= make_kqid(current_user_ns(), type
, id
);
287 if (!qid_has_mapping(sb
->s_user_ns
, qid
))
289 copy_from_if_dqblk(&fdq
, &idq
);
290 return sb
->s_qcop
->set_dqblk(sb
, qid
, &fdq
);
293 static int quota_enable(struct super_block
*sb
, void __user
*addr
)
297 if (copy_from_user(&flags
, addr
, sizeof(flags
)))
299 if (!sb
->s_qcop
->quota_enable
)
301 return sb
->s_qcop
->quota_enable(sb
, flags
);
304 static int quota_disable(struct super_block
*sb
, void __user
*addr
)
308 if (copy_from_user(&flags
, addr
, sizeof(flags
)))
310 if (!sb
->s_qcop
->quota_disable
)
312 return sb
->s_qcop
->quota_disable(sb
, flags
);
315 static int quota_state_to_flags(struct qc_state
*state
)
319 if (state
->s_state
[USRQUOTA
].flags
& QCI_ACCT_ENABLED
)
320 flags
|= FS_QUOTA_UDQ_ACCT
;
321 if (state
->s_state
[USRQUOTA
].flags
& QCI_LIMITS_ENFORCED
)
322 flags
|= FS_QUOTA_UDQ_ENFD
;
323 if (state
->s_state
[GRPQUOTA
].flags
& QCI_ACCT_ENABLED
)
324 flags
|= FS_QUOTA_GDQ_ACCT
;
325 if (state
->s_state
[GRPQUOTA
].flags
& QCI_LIMITS_ENFORCED
)
326 flags
|= FS_QUOTA_GDQ_ENFD
;
327 if (state
->s_state
[PRJQUOTA
].flags
& QCI_ACCT_ENABLED
)
328 flags
|= FS_QUOTA_PDQ_ACCT
;
329 if (state
->s_state
[PRJQUOTA
].flags
& QCI_LIMITS_ENFORCED
)
330 flags
|= FS_QUOTA_PDQ_ENFD
;
334 static int quota_getstate(struct super_block
*sb
, struct fs_quota_stat
*fqs
)
337 struct qc_state state
;
340 memset(&state
, 0, sizeof (struct qc_state
));
341 ret
= sb
->s_qcop
->get_state(sb
, &state
);
345 memset(fqs
, 0, sizeof(*fqs
));
346 fqs
->qs_version
= FS_QSTAT_VERSION
;
347 fqs
->qs_flags
= quota_state_to_flags(&state
);
348 /* No quota enabled? */
351 fqs
->qs_incoredqs
= state
.s_incoredqs
;
353 * GETXSTATE quotactl has space for just one set of time limits so
354 * report them for the first enabled quota type
356 for (type
= 0; type
< XQM_MAXQUOTAS
; type
++)
357 if (state
.s_state
[type
].flags
& QCI_ACCT_ENABLED
)
359 BUG_ON(type
== XQM_MAXQUOTAS
);
360 fqs
->qs_btimelimit
= state
.s_state
[type
].spc_timelimit
;
361 fqs
->qs_itimelimit
= state
.s_state
[type
].ino_timelimit
;
362 fqs
->qs_rtbtimelimit
= state
.s_state
[type
].rt_spc_timelimit
;
363 fqs
->qs_bwarnlimit
= state
.s_state
[type
].spc_warnlimit
;
364 fqs
->qs_iwarnlimit
= state
.s_state
[type
].ino_warnlimit
;
366 /* Inodes may be allocated even if inactive; copy out if present */
367 if (state
.s_state
[USRQUOTA
].ino
) {
368 fqs
->qs_uquota
.qfs_ino
= state
.s_state
[USRQUOTA
].ino
;
369 fqs
->qs_uquota
.qfs_nblks
= state
.s_state
[USRQUOTA
].blocks
;
370 fqs
->qs_uquota
.qfs_nextents
= state
.s_state
[USRQUOTA
].nextents
;
372 if (state
.s_state
[GRPQUOTA
].ino
) {
373 fqs
->qs_gquota
.qfs_ino
= state
.s_state
[GRPQUOTA
].ino
;
374 fqs
->qs_gquota
.qfs_nblks
= state
.s_state
[GRPQUOTA
].blocks
;
375 fqs
->qs_gquota
.qfs_nextents
= state
.s_state
[GRPQUOTA
].nextents
;
377 if (state
.s_state
[PRJQUOTA
].ino
) {
379 * Q_XGETQSTAT doesn't have room for both group and project
380 * quotas. So, allow the project quota values to be copied out
381 * only if there is no group quota information available.
383 if (!(state
.s_state
[GRPQUOTA
].flags
& QCI_ACCT_ENABLED
)) {
384 fqs
->qs_gquota
.qfs_ino
= state
.s_state
[PRJQUOTA
].ino
;
385 fqs
->qs_gquota
.qfs_nblks
=
386 state
.s_state
[PRJQUOTA
].blocks
;
387 fqs
->qs_gquota
.qfs_nextents
=
388 state
.s_state
[PRJQUOTA
].nextents
;
394 static int quota_getxstate(struct super_block
*sb
, void __user
*addr
)
396 struct fs_quota_stat fqs
;
399 if (!sb
->s_qcop
->get_state
)
401 ret
= quota_getstate(sb
, &fqs
);
402 if (!ret
&& copy_to_user(addr
, &fqs
, sizeof(fqs
)))
407 static int quota_getstatev(struct super_block
*sb
, struct fs_quota_statv
*fqs
)
410 struct qc_state state
;
413 memset(&state
, 0, sizeof (struct qc_state
));
414 ret
= sb
->s_qcop
->get_state(sb
, &state
);
418 memset(fqs
, 0, sizeof(*fqs
));
419 fqs
->qs_version
= FS_QSTAT_VERSION
;
420 fqs
->qs_flags
= quota_state_to_flags(&state
);
421 /* No quota enabled? */
424 fqs
->qs_incoredqs
= state
.s_incoredqs
;
426 * GETXSTATV quotactl has space for just one set of time limits so
427 * report them for the first enabled quota type
429 for (type
= 0; type
< XQM_MAXQUOTAS
; type
++)
430 if (state
.s_state
[type
].flags
& QCI_ACCT_ENABLED
)
432 BUG_ON(type
== XQM_MAXQUOTAS
);
433 fqs
->qs_btimelimit
= state
.s_state
[type
].spc_timelimit
;
434 fqs
->qs_itimelimit
= state
.s_state
[type
].ino_timelimit
;
435 fqs
->qs_rtbtimelimit
= state
.s_state
[type
].rt_spc_timelimit
;
436 fqs
->qs_bwarnlimit
= state
.s_state
[type
].spc_warnlimit
;
437 fqs
->qs_iwarnlimit
= state
.s_state
[type
].ino_warnlimit
;
439 /* Inodes may be allocated even if inactive; copy out if present */
440 if (state
.s_state
[USRQUOTA
].ino
) {
441 fqs
->qs_uquota
.qfs_ino
= state
.s_state
[USRQUOTA
].ino
;
442 fqs
->qs_uquota
.qfs_nblks
= state
.s_state
[USRQUOTA
].blocks
;
443 fqs
->qs_uquota
.qfs_nextents
= state
.s_state
[USRQUOTA
].nextents
;
445 if (state
.s_state
[GRPQUOTA
].ino
) {
446 fqs
->qs_gquota
.qfs_ino
= state
.s_state
[GRPQUOTA
].ino
;
447 fqs
->qs_gquota
.qfs_nblks
= state
.s_state
[GRPQUOTA
].blocks
;
448 fqs
->qs_gquota
.qfs_nextents
= state
.s_state
[GRPQUOTA
].nextents
;
450 if (state
.s_state
[PRJQUOTA
].ino
) {
451 fqs
->qs_pquota
.qfs_ino
= state
.s_state
[PRJQUOTA
].ino
;
452 fqs
->qs_pquota
.qfs_nblks
= state
.s_state
[PRJQUOTA
].blocks
;
453 fqs
->qs_pquota
.qfs_nextents
= state
.s_state
[PRJQUOTA
].nextents
;
458 static int quota_getxstatev(struct super_block
*sb
, void __user
*addr
)
460 struct fs_quota_statv fqs
;
463 if (!sb
->s_qcop
->get_state
)
466 memset(&fqs
, 0, sizeof(fqs
));
467 if (copy_from_user(&fqs
, addr
, 1)) /* Just read qs_version */
470 /* If this kernel doesn't support user specified version, fail */
471 switch (fqs
.qs_version
) {
472 case FS_QSTATV_VERSION1
:
477 ret
= quota_getstatev(sb
, &fqs
);
478 if (!ret
&& copy_to_user(addr
, &fqs
, sizeof(fqs
)))
484 * XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them
485 * out of there as xfsprogs rely on definitions being in that header file. So
486 * just define same functions here for quota purposes.
488 #define XFS_BB_SHIFT 9
490 static inline u64
quota_bbtob(u64 blocks
)
492 return blocks
<< XFS_BB_SHIFT
;
495 static inline u64
quota_btobb(u64 bytes
)
497 return (bytes
+ (1 << XFS_BB_SHIFT
) - 1) >> XFS_BB_SHIFT
;
500 static void copy_from_xfs_dqblk(struct qc_dqblk
*dst
, struct fs_disk_quota
*src
)
502 dst
->d_spc_hardlimit
= quota_bbtob(src
->d_blk_hardlimit
);
503 dst
->d_spc_softlimit
= quota_bbtob(src
->d_blk_softlimit
);
504 dst
->d_ino_hardlimit
= src
->d_ino_hardlimit
;
505 dst
->d_ino_softlimit
= src
->d_ino_softlimit
;
506 dst
->d_space
= quota_bbtob(src
->d_bcount
);
507 dst
->d_ino_count
= src
->d_icount
;
508 dst
->d_ino_timer
= src
->d_itimer
;
509 dst
->d_spc_timer
= src
->d_btimer
;
510 dst
->d_ino_warns
= src
->d_iwarns
;
511 dst
->d_spc_warns
= src
->d_bwarns
;
512 dst
->d_rt_spc_hardlimit
= quota_bbtob(src
->d_rtb_hardlimit
);
513 dst
->d_rt_spc_softlimit
= quota_bbtob(src
->d_rtb_softlimit
);
514 dst
->d_rt_space
= quota_bbtob(src
->d_rtbcount
);
515 dst
->d_rt_spc_timer
= src
->d_rtbtimer
;
516 dst
->d_rt_spc_warns
= src
->d_rtbwarns
;
517 dst
->d_fieldmask
= 0;
518 if (src
->d_fieldmask
& FS_DQ_ISOFT
)
519 dst
->d_fieldmask
|= QC_INO_SOFT
;
520 if (src
->d_fieldmask
& FS_DQ_IHARD
)
521 dst
->d_fieldmask
|= QC_INO_HARD
;
522 if (src
->d_fieldmask
& FS_DQ_BSOFT
)
523 dst
->d_fieldmask
|= QC_SPC_SOFT
;
524 if (src
->d_fieldmask
& FS_DQ_BHARD
)
525 dst
->d_fieldmask
|= QC_SPC_HARD
;
526 if (src
->d_fieldmask
& FS_DQ_RTBSOFT
)
527 dst
->d_fieldmask
|= QC_RT_SPC_SOFT
;
528 if (src
->d_fieldmask
& FS_DQ_RTBHARD
)
529 dst
->d_fieldmask
|= QC_RT_SPC_HARD
;
530 if (src
->d_fieldmask
& FS_DQ_BTIMER
)
531 dst
->d_fieldmask
|= QC_SPC_TIMER
;
532 if (src
->d_fieldmask
& FS_DQ_ITIMER
)
533 dst
->d_fieldmask
|= QC_INO_TIMER
;
534 if (src
->d_fieldmask
& FS_DQ_RTBTIMER
)
535 dst
->d_fieldmask
|= QC_RT_SPC_TIMER
;
536 if (src
->d_fieldmask
& FS_DQ_BWARNS
)
537 dst
->d_fieldmask
|= QC_SPC_WARNS
;
538 if (src
->d_fieldmask
& FS_DQ_IWARNS
)
539 dst
->d_fieldmask
|= QC_INO_WARNS
;
540 if (src
->d_fieldmask
& FS_DQ_RTBWARNS
)
541 dst
->d_fieldmask
|= QC_RT_SPC_WARNS
;
542 if (src
->d_fieldmask
& FS_DQ_BCOUNT
)
543 dst
->d_fieldmask
|= QC_SPACE
;
544 if (src
->d_fieldmask
& FS_DQ_ICOUNT
)
545 dst
->d_fieldmask
|= QC_INO_COUNT
;
546 if (src
->d_fieldmask
& FS_DQ_RTBCOUNT
)
547 dst
->d_fieldmask
|= QC_RT_SPACE
;
550 static void copy_qcinfo_from_xfs_dqblk(struct qc_info
*dst
,
551 struct fs_disk_quota
*src
)
553 memset(dst
, 0, sizeof(*dst
));
554 dst
->i_spc_timelimit
= src
->d_btimer
;
555 dst
->i_ino_timelimit
= src
->d_itimer
;
556 dst
->i_rt_spc_timelimit
= src
->d_rtbtimer
;
557 dst
->i_ino_warnlimit
= src
->d_iwarns
;
558 dst
->i_spc_warnlimit
= src
->d_bwarns
;
559 dst
->i_rt_spc_warnlimit
= src
->d_rtbwarns
;
560 if (src
->d_fieldmask
& FS_DQ_BWARNS
)
561 dst
->i_fieldmask
|= QC_SPC_WARNS
;
562 if (src
->d_fieldmask
& FS_DQ_IWARNS
)
563 dst
->i_fieldmask
|= QC_INO_WARNS
;
564 if (src
->d_fieldmask
& FS_DQ_RTBWARNS
)
565 dst
->i_fieldmask
|= QC_RT_SPC_WARNS
;
566 if (src
->d_fieldmask
& FS_DQ_BTIMER
)
567 dst
->i_fieldmask
|= QC_SPC_TIMER
;
568 if (src
->d_fieldmask
& FS_DQ_ITIMER
)
569 dst
->i_fieldmask
|= QC_INO_TIMER
;
570 if (src
->d_fieldmask
& FS_DQ_RTBTIMER
)
571 dst
->i_fieldmask
|= QC_RT_SPC_TIMER
;
574 static int quota_setxquota(struct super_block
*sb
, int type
, qid_t id
,
577 struct fs_disk_quota fdq
;
581 if (copy_from_user(&fdq
, addr
, sizeof(fdq
)))
583 if (!sb
->s_qcop
->set_dqblk
)
585 qid
= make_kqid(current_user_ns(), type
, id
);
586 if (!qid_has_mapping(sb
->s_user_ns
, qid
))
588 /* Are we actually setting timer / warning limits for all users? */
589 if (from_kqid(sb
->s_user_ns
, qid
) == 0 &&
590 fdq
.d_fieldmask
& (FS_DQ_WARNS_MASK
| FS_DQ_TIMER_MASK
)) {
591 struct qc_info qinfo
;
594 if (!sb
->s_qcop
->set_info
)
596 copy_qcinfo_from_xfs_dqblk(&qinfo
, &fdq
);
597 ret
= sb
->s_qcop
->set_info(sb
, type
, &qinfo
);
600 /* These are already done */
601 fdq
.d_fieldmask
&= ~(FS_DQ_WARNS_MASK
| FS_DQ_TIMER_MASK
);
603 copy_from_xfs_dqblk(&qdq
, &fdq
);
604 return sb
->s_qcop
->set_dqblk(sb
, qid
, &qdq
);
607 static void copy_to_xfs_dqblk(struct fs_disk_quota
*dst
, struct qc_dqblk
*src
,
610 memset(dst
, 0, sizeof(*dst
));
611 dst
->d_version
= FS_DQUOT_VERSION
;
613 if (type
== USRQUOTA
)
614 dst
->d_flags
= FS_USER_QUOTA
;
615 else if (type
== PRJQUOTA
)
616 dst
->d_flags
= FS_PROJ_QUOTA
;
618 dst
->d_flags
= FS_GROUP_QUOTA
;
619 dst
->d_blk_hardlimit
= quota_btobb(src
->d_spc_hardlimit
);
620 dst
->d_blk_softlimit
= quota_btobb(src
->d_spc_softlimit
);
621 dst
->d_ino_hardlimit
= src
->d_ino_hardlimit
;
622 dst
->d_ino_softlimit
= src
->d_ino_softlimit
;
623 dst
->d_bcount
= quota_btobb(src
->d_space
);
624 dst
->d_icount
= src
->d_ino_count
;
625 dst
->d_itimer
= src
->d_ino_timer
;
626 dst
->d_btimer
= src
->d_spc_timer
;
627 dst
->d_iwarns
= src
->d_ino_warns
;
628 dst
->d_bwarns
= src
->d_spc_warns
;
629 dst
->d_rtb_hardlimit
= quota_btobb(src
->d_rt_spc_hardlimit
);
630 dst
->d_rtb_softlimit
= quota_btobb(src
->d_rt_spc_softlimit
);
631 dst
->d_rtbcount
= quota_btobb(src
->d_rt_space
);
632 dst
->d_rtbtimer
= src
->d_rt_spc_timer
;
633 dst
->d_rtbwarns
= src
->d_rt_spc_warns
;
636 static int quota_getxquota(struct super_block
*sb
, int type
, qid_t id
,
639 struct fs_disk_quota fdq
;
644 if (!sb
->s_qcop
->get_dqblk
)
646 qid
= make_kqid(current_user_ns(), type
, id
);
647 if (!qid_has_mapping(sb
->s_user_ns
, qid
))
649 ret
= sb
->s_qcop
->get_dqblk(sb
, qid
, &qdq
);
652 copy_to_xfs_dqblk(&fdq
, &qdq
, type
, id
);
653 if (copy_to_user(addr
, &fdq
, sizeof(fdq
)))
659 * Return quota for next active quota >= this id, if any exists,
660 * otherwise return -ENOENT via ->get_nextdqblk.
662 static int quota_getnextxquota(struct super_block
*sb
, int type
, qid_t id
,
665 struct fs_disk_quota fdq
;
671 if (!sb
->s_qcop
->get_nextdqblk
)
673 qid
= make_kqid(current_user_ns(), type
, id
);
674 if (!qid_has_mapping(sb
->s_user_ns
, qid
))
676 ret
= sb
->s_qcop
->get_nextdqblk(sb
, &qid
, &qdq
);
679 id_out
= from_kqid(current_user_ns(), qid
);
680 copy_to_xfs_dqblk(&fdq
, &qdq
, type
, id_out
);
681 if (copy_to_user(addr
, &fdq
, sizeof(fdq
)))
686 static int quota_rmxquota(struct super_block
*sb
, void __user
*addr
)
690 if (copy_from_user(&flags
, addr
, sizeof(flags
)))
692 if (!sb
->s_qcop
->rm_xquota
)
694 return sb
->s_qcop
->rm_xquota(sb
, flags
);
697 /* Copy parameters and call proper function */
698 static int do_quotactl(struct super_block
*sb
, int type
, int cmd
, qid_t id
,
699 void __user
*addr
, const struct path
*path
)
703 if (type
>= (XQM_COMMAND(cmd
) ? XQM_MAXQUOTAS
: MAXQUOTAS
))
706 * Quota not supported on this fs? Check this before s_quota_types
707 * since they needn't be set if quota is not supported at all.
711 if (!(sb
->s_quota_types
& (1 << type
)))
714 ret
= check_quotactl_permission(sb
, type
, cmd
, id
);
720 return quota_quotaon(sb
, type
, id
, path
);
722 return quota_quotaoff(sb
, type
);
724 return quota_getfmt(sb
, type
, addr
);
726 return quota_getinfo(sb
, type
, addr
);
728 return quota_setinfo(sb
, type
, addr
);
730 return quota_getquota(sb
, type
, id
, addr
);
732 return quota_getnextquota(sb
, type
, id
, addr
);
734 return quota_setquota(sb
, type
, id
, addr
);
736 if (!sb
->s_qcop
->quota_sync
)
738 return sb
->s_qcop
->quota_sync(sb
, type
);
740 return quota_enable(sb
, addr
);
742 return quota_disable(sb
, addr
);
744 return quota_rmxquota(sb
, addr
);
746 return quota_getxstate(sb
, addr
);
748 return quota_getxstatev(sb
, addr
);
750 return quota_setxquota(sb
, type
, id
, addr
);
752 return quota_getxquota(sb
, type
, id
, addr
);
753 case Q_XGETNEXTQUOTA
:
754 return quota_getnextxquota(sb
, type
, id
, addr
);
756 if (sb
->s_flags
& MS_RDONLY
)
758 /* XFS quotas are fully coherent now, making this call a noop */
767 /* Return 1 if 'cmd' will block on frozen filesystem */
768 static int quotactl_cmd_write(int cmd
)
771 * We cannot allow Q_GETQUOTA and Q_GETNEXTQUOTA without write access
772 * as dquot_acquire() may allocate space for new structure and OCFS2
773 * needs to increment on-disk use count.
782 case Q_XGETNEXTQUOTA
:
788 #endif /* CONFIG_BLOCK */
790 /* Return true if quotactl command is manipulating quota on/off state */
791 static bool quotactl_cmd_onoff(int cmd
)
793 return (cmd
== Q_QUOTAON
) || (cmd
== Q_QUOTAOFF
);
797 * look up a superblock on which quota ops will be performed
798 * - use the name of a block device to find the superblock thereon
800 static struct super_block
*quotactl_block(const char __user
*special
, int cmd
)
803 struct block_device
*bdev
;
804 struct super_block
*sb
;
805 struct filename
*tmp
= getname(special
);
808 return ERR_CAST(tmp
);
809 bdev
= lookup_bdev(tmp
->name
);
812 return ERR_CAST(bdev
);
813 if (quotactl_cmd_onoff(cmd
))
814 sb
= get_super_exclusive_thawed(bdev
);
815 else if (quotactl_cmd_write(cmd
))
816 sb
= get_super_thawed(bdev
);
818 sb
= get_super(bdev
);
821 return ERR_PTR(-ENODEV
);
825 return ERR_PTR(-ENODEV
);
830 * This is the system call interface. This communicates with
831 * the user-level programs. Currently this only supports diskquota
832 * calls. Maybe we need to add the process quotas etc. in the future,
833 * but we probably should use rlimits for that.
835 SYSCALL_DEFINE4(quotactl
, unsigned int, cmd
, const char __user
*, special
,
836 qid_t
, id
, void __user
*, addr
)
839 struct super_block
*sb
= NULL
;
840 struct path path
, *pathp
= NULL
;
843 cmds
= cmd
>> SUBCMDSHIFT
;
844 type
= cmd
& SUBCMDMASK
;
847 * As a special case Q_SYNC can be called without a specific device.
848 * It will iterate all superblocks that have quota enabled and call
849 * the sync action on each of them.
853 return quota_sync_all(type
);
858 * Path for quotaon has to be resolved before grabbing superblock
859 * because that gets s_umount sem which is also possibly needed by path
860 * resolution (think about autofs) and thus deadlocks could arise.
862 if (cmds
== Q_QUOTAON
) {
863 ret
= user_path_at(AT_FDCWD
, addr
, LOOKUP_FOLLOW
|LOOKUP_AUTOMOUNT
, &path
);
865 pathp
= ERR_PTR(ret
);
870 sb
= quotactl_block(special
, cmds
);
876 ret
= do_quotactl(sb
, type
, cmds
, id
, addr
, pathp
);
878 if (!quotactl_cmd_onoff(cmds
))
881 drop_super_exclusive(sb
);
883 if (pathp
&& !IS_ERR(pathp
))