1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6
7
8 #include "xfs.h"
9 #include "xfs_fs.h"
10 #include "xfs_shared.h"
11 #include "xfs_format.h"
12 #include "xfs_log_format.h"
13 #include "xfs_trans_resv.h"
14 #include "xfs_sb.h"
15 #include "xfs_mount.h"
16 #include "xfs_inode.h"
17 #include "xfs_trans.h"
18 #include "xfs_quota.h"
19 #include "xfs_qm.h"
20 #include "xfs_icache.h"
21
22 int
xfs_qm_scall_quotaoff(xfs_mount_t * mp,uint flags)23 xfs_qm_scall_quotaoff(
24 xfs_mount_t *mp,
25 uint flags)
26 {
27 /*
28 * No file system can have quotas enabled on disk but not in core.
29 * Note that quota utilities (like quotaoff) _expect_
30 * errno == -EEXIST here.
31 */
32 if ((mp->m_qflags & flags) == 0)
33 return -EEXIST;
34
35 /*
36 * We do not support actually turning off quota accounting any more.
37 * Just log a warning and ignore the accounting related flags.
38 */
39 if (flags & XFS_ALL_QUOTA_ACCT)
40 xfs_info(mp, "disabling of quota accounting not supported.");
41
42 mutex_lock(&mp->m_quotainfo->qi_quotaofflock);
43 mp->m_qflags &= ~(flags & XFS_ALL_QUOTA_ENFD);
44 spin_lock(&mp->m_sb_lock);
45 mp->m_sb.sb_qflags = mp->m_qflags;
46 spin_unlock(&mp->m_sb_lock);
47 mutex_unlock(&mp->m_quotainfo->qi_quotaofflock);
48
49 /* XXX what to do if error ? Revert back to old vals incore ? */
50 return xfs_sync_sb(mp, false);
51 }
52
53 STATIC int
xfs_qm_scall_trunc_qfile(struct xfs_mount * mp,xfs_dqtype_t type)54 xfs_qm_scall_trunc_qfile(
55 struct xfs_mount *mp,
56 xfs_dqtype_t type)
57 {
58 struct xfs_inode *ip;
59 struct xfs_trans *tp;
60 int error;
61
62 error = xfs_qm_qino_load(mp, type, &ip);
63 if (error == -ENOENT)
64 return 0;
65 if (error)
66 return error;
67
68 xfs_ilock(ip, XFS_IOLOCK_EXCL);
69
70 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
71 if (error) {
72 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
73 goto out_put;
74 }
75
76 xfs_ilock(ip, XFS_ILOCK_EXCL);
77 xfs_trans_ijoin(tp, ip, 0);
78
79 ip->i_disk_size = 0;
80 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
81
82 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
83 if (error) {
84 xfs_trans_cancel(tp);
85 goto out_unlock;
86 }
87
88 ASSERT(ip->i_df.if_nextents == 0);
89
90 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
91 error = xfs_trans_commit(tp);
92
93 out_unlock:
94 xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
95 out_put:
96 xfs_irele(ip);
97 return error;
98 }
99
100 int
xfs_qm_scall_trunc_qfiles(xfs_mount_t * mp,uint flags)101 xfs_qm_scall_trunc_qfiles(
102 xfs_mount_t *mp,
103 uint flags)
104 {
105 int error = -EINVAL;
106
107 if (!xfs_has_quota(mp) || flags == 0 ||
108 (flags & ~XFS_QMOPT_QUOTALL)) {
109 xfs_debug(mp, "%s: flags=%x m_qflags=%x",
110 __func__, flags, mp->m_qflags);
111 return -EINVAL;
112 }
113
114 if (flags & XFS_QMOPT_UQUOTA) {
115 error = xfs_qm_scall_trunc_qfile(mp, XFS_DQTYPE_USER);
116 if (error)
117 return error;
118 }
119 if (flags & XFS_QMOPT_GQUOTA) {
120 error = xfs_qm_scall_trunc_qfile(mp, XFS_DQTYPE_GROUP);
121 if (error)
122 return error;
123 }
124 if (flags & XFS_QMOPT_PQUOTA)
125 error = xfs_qm_scall_trunc_qfile(mp, XFS_DQTYPE_PROJ);
126
127 return error;
128 }
129
130 /*
131 * Switch on (a given) quota enforcement for a filesystem. This takes
132 * effect immediately.
133 * (Switching on quota accounting must be done at mount time.)
134 */
135 int
xfs_qm_scall_quotaon(xfs_mount_t * mp,uint flags)136 xfs_qm_scall_quotaon(
137 xfs_mount_t *mp,
138 uint flags)
139 {
140 int error;
141 uint qf;
142
143 /*
144 * Switching on quota accounting must be done at mount time,
145 * only consider quota enforcement stuff here.
146 */
147 flags &= XFS_ALL_QUOTA_ENFD;
148
149 if (flags == 0) {
150 xfs_debug(mp, "%s: zero flags, m_qflags=%x",
151 __func__, mp->m_qflags);
152 return -EINVAL;
153 }
154
155 /*
156 * Can't enforce without accounting. We check the superblock
157 * qflags here instead of m_qflags because rootfs can have
158 * quota acct on ondisk without m_qflags' knowing.
159 */
160 if (((mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) == 0 &&
161 (flags & XFS_UQUOTA_ENFD)) ||
162 ((mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) == 0 &&
163 (flags & XFS_GQUOTA_ENFD)) ||
164 ((mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) == 0 &&
165 (flags & XFS_PQUOTA_ENFD))) {
166 xfs_debug(mp,
167 "%s: Can't enforce without acct, flags=%x sbflags=%x",
168 __func__, flags, mp->m_sb.sb_qflags);
169 return -EINVAL;
170 }
171 /*
172 * If everything's up to-date incore, then don't waste time.
173 */
174 if ((mp->m_qflags & flags) == flags)
175 return -EEXIST;
176
177 /*
178 * Change sb_qflags on disk but not incore mp->qflags
179 * if this is the root filesystem.
180 */
181 spin_lock(&mp->m_sb_lock);
182 qf = mp->m_sb.sb_qflags;
183 mp->m_sb.sb_qflags = qf | flags;
184 spin_unlock(&mp->m_sb_lock);
185
186 /*
187 * There's nothing to change if it's the same.
188 */
189 if ((qf & flags) == flags)
190 return -EEXIST;
191
192 error = xfs_sync_sb(mp, false);
193 if (error)
194 return error;
195 /*
196 * If we aren't trying to switch on quota enforcement, we are done.
197 */
198 if (((mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) !=
199 (mp->m_qflags & XFS_UQUOTA_ACCT)) ||
200 ((mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) !=
201 (mp->m_qflags & XFS_PQUOTA_ACCT)) ||
202 ((mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) !=
203 (mp->m_qflags & XFS_GQUOTA_ACCT)))
204 return 0;
205
206 if (!XFS_IS_QUOTA_ON(mp))
207 return -ESRCH;
208
209 /*
210 * Switch on quota enforcement in core.
211 */
212 mutex_lock(&mp->m_quotainfo->qi_quotaofflock);
213 mp->m_qflags |= (flags & XFS_ALL_QUOTA_ENFD);
214 mutex_unlock(&mp->m_quotainfo->qi_quotaofflock);
215
216 return 0;
217 }
218
219 #define XFS_QC_MASK (QC_LIMIT_MASK | QC_TIMER_MASK)
220
221 /*
222 * Adjust limits of this quota, and the defaults if passed in. Returns true
223 * if the new limits made sense and were applied, false otherwise.
224 */
225 static inline bool
xfs_setqlim_limits(struct xfs_mount * mp,struct xfs_dquot_res * res,struct xfs_quota_limits * qlim,xfs_qcnt_t hard,xfs_qcnt_t soft,const char * tag)226 xfs_setqlim_limits(
227 struct xfs_mount *mp,
228 struct xfs_dquot_res *res,
229 struct xfs_quota_limits *qlim,
230 xfs_qcnt_t hard,
231 xfs_qcnt_t soft,
232 const char *tag)
233 {
234 /* The hard limit can't be less than the soft limit. */
235 if (hard != 0 && hard < soft) {
236 xfs_debug(mp, "%shard %lld < %ssoft %lld", tag, hard, tag,
237 soft);
238 return false;
239 }
240
241 res->hardlimit = hard;
242 res->softlimit = soft;
243 if (qlim) {
244 qlim->hard = hard;
245 qlim->soft = soft;
246 }
247
248 return true;
249 }
250
251 static inline void
xfs_setqlim_timer(struct xfs_mount * mp,struct xfs_dquot_res * res,struct xfs_quota_limits * qlim,s64 timer)252 xfs_setqlim_timer(
253 struct xfs_mount *mp,
254 struct xfs_dquot_res *res,
255 struct xfs_quota_limits *qlim,
256 s64 timer)
257 {
258 if (qlim) {
259 /* Set the length of the default grace period. */
260 res->timer = xfs_dquot_set_grace_period(timer);
261 qlim->time = res->timer;
262 } else {
263 /* Set the grace period expiration on a quota. */
264 res->timer = xfs_dquot_set_timeout(mp, timer);
265 }
266 }
267
268 /*
269 * Adjust quota limits, and start/stop timers accordingly.
270 */
271 int
xfs_qm_scall_setqlim(struct xfs_mount * mp,xfs_dqid_t id,xfs_dqtype_t type,struct qc_dqblk * newlim)272 xfs_qm_scall_setqlim(
273 struct xfs_mount *mp,
274 xfs_dqid_t id,
275 xfs_dqtype_t type,
276 struct qc_dqblk *newlim)
277 {
278 struct xfs_quotainfo *q = mp->m_quotainfo;
279 struct xfs_dquot *dqp;
280 struct xfs_trans *tp;
281 struct xfs_def_quota *defq;
282 struct xfs_dquot_res *res;
283 struct xfs_quota_limits *qlim;
284 int error;
285 xfs_qcnt_t hard, soft;
286
287 if (newlim->d_fieldmask & ~XFS_QC_MASK)
288 return -EINVAL;
289 if ((newlim->d_fieldmask & XFS_QC_MASK) == 0)
290 return 0;
291
292 /*
293 * Get the dquot (locked) before we start, as we need to do a
294 * transaction to allocate it if it doesn't exist. Once we have the
295 * dquot, unlock it so we can start the next transaction safely. We hold
296 * a reference to the dquot, so it's safe to do this unlock/lock without
297 * it being reclaimed in the mean time.
298 */
299 error = xfs_qm_dqget(mp, id, type, true, &dqp);
300 if (error) {
301 ASSERT(error != -ENOENT);
302 return error;
303 }
304
305 defq = xfs_get_defquota(q, xfs_dquot_type(dqp));
306 xfs_dqunlock(dqp);
307
308 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_setqlim, 0, 0, 0, &tp);
309 if (error)
310 goto out_rele;
311
312 xfs_dqlock(dqp);
313 xfs_trans_dqjoin(tp, dqp);
314
315 /*
316 * Update quota limits, warnings, and timers, and the defaults
317 * if we're touching id == 0.
318 *
319 * Make sure that hardlimits are >= soft limits before changing.
320 *
321 * Update warnings counter(s) if requested.
322 *
323 * Timelimits for the super user set the relative time the other users
324 * can be over quota for this file system. If it is zero a default is
325 * used. Ditto for the default soft and hard limit values (already
326 * done, above), and for warnings.
327 *
328 * For other IDs, userspace can bump out the grace period if over
329 * the soft limit.
330 */
331
332 /* Blocks on the data device. */
333 hard = (newlim->d_fieldmask & QC_SPC_HARD) ?
334 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_spc_hardlimit) :
335 dqp->q_blk.hardlimit;
336 soft = (newlim->d_fieldmask & QC_SPC_SOFT) ?
337 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_spc_softlimit) :
338 dqp->q_blk.softlimit;
339 res = &dqp->q_blk;
340 qlim = id == 0 ? &defq->blk : NULL;
341
342 if (xfs_setqlim_limits(mp, res, qlim, hard, soft, "blk"))
343 xfs_dquot_set_prealloc_limits(dqp);
344 if (newlim->d_fieldmask & QC_SPC_TIMER)
345 xfs_setqlim_timer(mp, res, qlim, newlim->d_spc_timer);
346
347 /* Blocks on the realtime device. */
348 hard = (newlim->d_fieldmask & QC_RT_SPC_HARD) ?
349 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_rt_spc_hardlimit) :
350 dqp->q_rtb.hardlimit;
351 soft = (newlim->d_fieldmask & QC_RT_SPC_SOFT) ?
352 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_rt_spc_softlimit) :
353 dqp->q_rtb.softlimit;
354 res = &dqp->q_rtb;
355 qlim = id == 0 ? &defq->rtb : NULL;
356
357 xfs_setqlim_limits(mp, res, qlim, hard, soft, "rtb");
358 if (newlim->d_fieldmask & QC_RT_SPC_TIMER)
359 xfs_setqlim_timer(mp, res, qlim, newlim->d_rt_spc_timer);
360
361 /* Inodes */
362 hard = (newlim->d_fieldmask & QC_INO_HARD) ?
363 (xfs_qcnt_t) newlim->d_ino_hardlimit :
364 dqp->q_ino.hardlimit;
365 soft = (newlim->d_fieldmask & QC_INO_SOFT) ?
366 (xfs_qcnt_t) newlim->d_ino_softlimit :
367 dqp->q_ino.softlimit;
368 res = &dqp->q_ino;
369 qlim = id == 0 ? &defq->ino : NULL;
370
371 xfs_setqlim_limits(mp, res, qlim, hard, soft, "ino");
372 if (newlim->d_fieldmask & QC_INO_TIMER)
373 xfs_setqlim_timer(mp, res, qlim, newlim->d_ino_timer);
374
375 if (id != 0) {
376 /*
377 * If the user is now over quota, start the timelimit.
378 * The user will not be 'warned'.
379 * Note that we keep the timers ticking, whether enforcement
380 * is on or off. We don't really want to bother with iterating
381 * over all ondisk dquots and turning the timers on/off.
382 */
383 xfs_qm_adjust_dqtimers(dqp);
384 }
385 dqp->q_flags |= XFS_DQFLAG_DIRTY;
386 xfs_trans_log_dquot(tp, dqp);
387
388 error = xfs_trans_commit(tp);
389
390 out_rele:
391 xfs_qm_dqrele(dqp);
392 return error;
393 }
394
395 /* Fill out the quota context. */
396 static void
xfs_qm_scall_getquota_fill_qc(struct xfs_mount * mp,xfs_dqtype_t type,const struct xfs_dquot * dqp,struct qc_dqblk * dst)397 xfs_qm_scall_getquota_fill_qc(
398 struct xfs_mount *mp,
399 xfs_dqtype_t type,
400 const struct xfs_dquot *dqp,
401 struct qc_dqblk *dst)
402 {
403 memset(dst, 0, sizeof(*dst));
404 dst->d_spc_hardlimit = XFS_FSB_TO_B(mp, dqp->q_blk.hardlimit);
405 dst->d_spc_softlimit = XFS_FSB_TO_B(mp, dqp->q_blk.softlimit);
406 dst->d_ino_hardlimit = dqp->q_ino.hardlimit;
407 dst->d_ino_softlimit = dqp->q_ino.softlimit;
408 dst->d_space = XFS_FSB_TO_B(mp, dqp->q_blk.reserved);
409 dst->d_ino_count = dqp->q_ino.reserved;
410 dst->d_spc_timer = dqp->q_blk.timer;
411 dst->d_ino_timer = dqp->q_ino.timer;
412 dst->d_ino_warns = 0;
413 dst->d_spc_warns = 0;
414 dst->d_rt_spc_hardlimit = XFS_FSB_TO_B(mp, dqp->q_rtb.hardlimit);
415 dst->d_rt_spc_softlimit = XFS_FSB_TO_B(mp, dqp->q_rtb.softlimit);
416 dst->d_rt_space = XFS_FSB_TO_B(mp, dqp->q_rtb.reserved);
417 dst->d_rt_spc_timer = dqp->q_rtb.timer;
418 dst->d_rt_spc_warns = 0;
419
420 /*
421 * Internally, we don't reset all the timers when quota enforcement
422 * gets turned off. No need to confuse the user level code,
423 * so return zeroes in that case.
424 */
425 if (!xfs_dquot_is_enforced(dqp)) {
426 dst->d_spc_timer = 0;
427 dst->d_ino_timer = 0;
428 dst->d_rt_spc_timer = 0;
429 }
430
431 #ifdef DEBUG
432 if (xfs_dquot_is_enforced(dqp) && dqp->q_id != 0) {
433 if ((dst->d_space > dst->d_spc_softlimit) &&
434 (dst->d_spc_softlimit > 0)) {
435 ASSERT(dst->d_spc_timer != 0);
436 }
437 if ((dst->d_ino_count > dqp->q_ino.softlimit) &&
438 (dqp->q_ino.softlimit > 0)) {
439 ASSERT(dst->d_ino_timer != 0);
440 }
441 }
442 #endif
443 }
444
445 /* Return the quota information for the dquot matching id. */
446 int
xfs_qm_scall_getquota(struct xfs_mount * mp,xfs_dqid_t id,xfs_dqtype_t type,struct qc_dqblk * dst)447 xfs_qm_scall_getquota(
448 struct xfs_mount *mp,
449 xfs_dqid_t id,
450 xfs_dqtype_t type,
451 struct qc_dqblk *dst)
452 {
453 struct xfs_dquot *dqp;
454 int error;
455
456 /*
457 * Expedite pending inodegc work at the start of a quota reporting
458 * scan but don't block waiting for it to complete.
459 */
460 if (id == 0)
461 xfs_inodegc_push(mp);
462
463 /*
464 * Try to get the dquot. We don't want it allocated on disk, so don't
465 * set doalloc. If it doesn't exist, we'll get ENOENT back.
466 */
467 error = xfs_qm_dqget(mp, id, type, false, &dqp);
468 if (error)
469 return error;
470
471 /*
472 * If everything's NULL, this dquot doesn't quite exist as far as
473 * our utility programs are concerned.
474 */
475 if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
476 error = -ENOENT;
477 goto out_put;
478 }
479
480 xfs_qm_scall_getquota_fill_qc(mp, type, dqp, dst);
481
482 out_put:
483 xfs_qm_dqput(dqp);
484 return error;
485 }
486
487 /*
488 * Return the quota information for the first initialized dquot whose id
489 * is at least as high as id.
490 */
491 int
xfs_qm_scall_getquota_next(struct xfs_mount * mp,xfs_dqid_t * id,xfs_dqtype_t type,struct qc_dqblk * dst)492 xfs_qm_scall_getquota_next(
493 struct xfs_mount *mp,
494 xfs_dqid_t *id,
495 xfs_dqtype_t type,
496 struct qc_dqblk *dst)
497 {
498 struct xfs_dquot *dqp;
499 int error;
500
501 /* Flush inodegc work at the start of a quota reporting scan. */
502 if (*id == 0)
503 xfs_inodegc_push(mp);
504
505 error = xfs_qm_dqget_next(mp, *id, type, &dqp);
506 if (error)
507 return error;
508
509 /* Fill in the ID we actually read from disk */
510 *id = dqp->q_id;
511
512 xfs_qm_scall_getquota_fill_qc(mp, type, dqp, dst);
513
514 xfs_qm_dqput(dqp);
515 return error;
516 }
517