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_ino_t ino)54 xfs_qm_scall_trunc_qfile(
55 struct xfs_mount *mp,
56 xfs_ino_t ino)
57 {
58 struct xfs_inode *ip;
59 struct xfs_trans *tp;
60 int error;
61
62 if (ino == NULLFSINO)
63 return 0;
64
65 error = xfs_iget(mp, NULL, ino, 0, 0, &ip);
66 if (error)
67 return error;
68
69 xfs_ilock(ip, XFS_IOLOCK_EXCL);
70
71 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
72 if (error) {
73 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
74 goto out_put;
75 }
76
77 xfs_ilock(ip, XFS_ILOCK_EXCL);
78 xfs_trans_ijoin(tp, ip, 0);
79
80 ip->i_disk_size = 0;
81 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
82
83 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
84 if (error) {
85 xfs_trans_cancel(tp);
86 goto out_unlock;
87 }
88
89 ASSERT(ip->i_df.if_nextents == 0);
90
91 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
92 error = xfs_trans_commit(tp);
93
94 out_unlock:
95 xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
96 out_put:
97 xfs_irele(ip);
98 return error;
99 }
100
101 int
xfs_qm_scall_trunc_qfiles(xfs_mount_t * mp,uint flags)102 xfs_qm_scall_trunc_qfiles(
103 xfs_mount_t *mp,
104 uint flags)
105 {
106 int error = -EINVAL;
107
108 if (!xfs_has_quota(mp) || flags == 0 ||
109 (flags & ~XFS_QMOPT_QUOTALL)) {
110 xfs_debug(mp, "%s: flags=%x m_qflags=%x",
111 __func__, flags, mp->m_qflags);
112 return -EINVAL;
113 }
114
115 if (flags & XFS_QMOPT_UQUOTA) {
116 error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_uquotino);
117 if (error)
118 return error;
119 }
120 if (flags & XFS_QMOPT_GQUOTA) {
121 error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_gquotino);
122 if (error)
123 return error;
124 }
125 if (flags & XFS_QMOPT_PQUOTA)
126 error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_pquotino);
127
128 return error;
129 }
130
131 /*
132 * Switch on (a given) quota enforcement for a filesystem. This takes
133 * effect immediately.
134 * (Switching on quota accounting must be done at mount time.)
135 */
136 int
xfs_qm_scall_quotaon(xfs_mount_t * mp,uint flags)137 xfs_qm_scall_quotaon(
138 xfs_mount_t *mp,
139 uint flags)
140 {
141 int error;
142 uint qf;
143
144 /*
145 * Switching on quota accounting must be done at mount time,
146 * only consider quota enforcement stuff here.
147 */
148 flags &= XFS_ALL_QUOTA_ENFD;
149
150 if (flags == 0) {
151 xfs_debug(mp, "%s: zero flags, m_qflags=%x",
152 __func__, mp->m_qflags);
153 return -EINVAL;
154 }
155
156 /*
157 * Can't enforce without accounting. We check the superblock
158 * qflags here instead of m_qflags because rootfs can have
159 * quota acct on ondisk without m_qflags' knowing.
160 */
161 if (((mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) == 0 &&
162 (flags & XFS_UQUOTA_ENFD)) ||
163 ((mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) == 0 &&
164 (flags & XFS_GQUOTA_ENFD)) ||
165 ((mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) == 0 &&
166 (flags & XFS_PQUOTA_ENFD))) {
167 xfs_debug(mp,
168 "%s: Can't enforce without acct, flags=%x sbflags=%x",
169 __func__, flags, mp->m_sb.sb_qflags);
170 return -EINVAL;
171 }
172 /*
173 * If everything's up to-date incore, then don't waste time.
174 */
175 if ((mp->m_qflags & flags) == flags)
176 return -EEXIST;
177
178 /*
179 * Change sb_qflags on disk but not incore mp->qflags
180 * if this is the root filesystem.
181 */
182 spin_lock(&mp->m_sb_lock);
183 qf = mp->m_sb.sb_qflags;
184 mp->m_sb.sb_qflags = qf | flags;
185 spin_unlock(&mp->m_sb_lock);
186
187 /*
188 * There's nothing to change if it's the same.
189 */
190 if ((qf & flags) == flags)
191 return -EEXIST;
192
193 error = xfs_sync_sb(mp, false);
194 if (error)
195 return error;
196 /*
197 * If we aren't trying to switch on quota enforcement, we are done.
198 */
199 if (((mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT) !=
200 (mp->m_qflags & XFS_UQUOTA_ACCT)) ||
201 ((mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT) !=
202 (mp->m_qflags & XFS_PQUOTA_ACCT)) ||
203 ((mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT) !=
204 (mp->m_qflags & XFS_GQUOTA_ACCT)))
205 return 0;
206
207 if (!XFS_IS_QUOTA_ON(mp))
208 return -ESRCH;
209
210 /*
211 * Switch on quota enforcement in core.
212 */
213 mutex_lock(&mp->m_quotainfo->qi_quotaofflock);
214 mp->m_qflags |= (flags & XFS_ALL_QUOTA_ENFD);
215 mutex_unlock(&mp->m_quotainfo->qi_quotaofflock);
216
217 return 0;
218 }
219
220 #define XFS_QC_MASK (QC_LIMIT_MASK | QC_TIMER_MASK)
221
222 /*
223 * Adjust limits of this quota, and the defaults if passed in. Returns true
224 * if the new limits made sense and were applied, false otherwise.
225 */
226 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)227 xfs_setqlim_limits(
228 struct xfs_mount *mp,
229 struct xfs_dquot_res *res,
230 struct xfs_quota_limits *qlim,
231 xfs_qcnt_t hard,
232 xfs_qcnt_t soft,
233 const char *tag)
234 {
235 /* The hard limit can't be less than the soft limit. */
236 if (hard != 0 && hard < soft) {
237 xfs_debug(mp, "%shard %lld < %ssoft %lld", tag, hard, tag,
238 soft);
239 return false;
240 }
241
242 res->hardlimit = hard;
243 res->softlimit = soft;
244 if (qlim) {
245 qlim->hard = hard;
246 qlim->soft = soft;
247 }
248
249 return true;
250 }
251
252 static inline void
xfs_setqlim_timer(struct xfs_mount * mp,struct xfs_dquot_res * res,struct xfs_quota_limits * qlim,s64 timer)253 xfs_setqlim_timer(
254 struct xfs_mount *mp,
255 struct xfs_dquot_res *res,
256 struct xfs_quota_limits *qlim,
257 s64 timer)
258 {
259 if (qlim) {
260 /* Set the length of the default grace period. */
261 res->timer = xfs_dquot_set_grace_period(timer);
262 qlim->time = res->timer;
263 } else {
264 /* Set the grace period expiration on a quota. */
265 res->timer = xfs_dquot_set_timeout(mp, timer);
266 }
267 }
268
269 /*
270 * Adjust quota limits, and start/stop timers accordingly.
271 */
272 int
xfs_qm_scall_setqlim(struct xfs_mount * mp,xfs_dqid_t id,xfs_dqtype_t type,struct qc_dqblk * newlim)273 xfs_qm_scall_setqlim(
274 struct xfs_mount *mp,
275 xfs_dqid_t id,
276 xfs_dqtype_t type,
277 struct qc_dqblk *newlim)
278 {
279 struct xfs_quotainfo *q = mp->m_quotainfo;
280 struct xfs_dquot *dqp;
281 struct xfs_trans *tp;
282 struct xfs_def_quota *defq;
283 struct xfs_dquot_res *res;
284 struct xfs_quota_limits *qlim;
285 int error;
286 xfs_qcnt_t hard, soft;
287
288 if (newlim->d_fieldmask & ~XFS_QC_MASK)
289 return -EINVAL;
290 if ((newlim->d_fieldmask & XFS_QC_MASK) == 0)
291 return 0;
292
293 /*
294 * Get the dquot (locked) before we start, as we need to do a
295 * transaction to allocate it if it doesn't exist. Once we have the
296 * dquot, unlock it so we can start the next transaction safely. We hold
297 * a reference to the dquot, so it's safe to do this unlock/lock without
298 * it being reclaimed in the mean time.
299 */
300 error = xfs_qm_dqget(mp, id, type, true, &dqp);
301 if (error) {
302 ASSERT(error != -ENOENT);
303 return error;
304 }
305
306 defq = xfs_get_defquota(q, xfs_dquot_type(dqp));
307 xfs_dqunlock(dqp);
308
309 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_setqlim, 0, 0, 0, &tp);
310 if (error)
311 goto out_rele;
312
313 xfs_dqlock(dqp);
314 xfs_trans_dqjoin(tp, dqp);
315
316 /*
317 * Update quota limits, warnings, and timers, and the defaults
318 * if we're touching id == 0.
319 *
320 * Make sure that hardlimits are >= soft limits before changing.
321 *
322 * Update warnings counter(s) if requested.
323 *
324 * Timelimits for the super user set the relative time the other users
325 * can be over quota for this file system. If it is zero a default is
326 * used. Ditto for the default soft and hard limit values (already
327 * done, above), and for warnings.
328 *
329 * For other IDs, userspace can bump out the grace period if over
330 * the soft limit.
331 */
332
333 /* Blocks on the data device. */
334 hard = (newlim->d_fieldmask & QC_SPC_HARD) ?
335 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_spc_hardlimit) :
336 dqp->q_blk.hardlimit;
337 soft = (newlim->d_fieldmask & QC_SPC_SOFT) ?
338 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_spc_softlimit) :
339 dqp->q_blk.softlimit;
340 res = &dqp->q_blk;
341 qlim = id == 0 ? &defq->blk : NULL;
342
343 if (xfs_setqlim_limits(mp, res, qlim, hard, soft, "blk"))
344 xfs_dquot_set_prealloc_limits(dqp);
345 if (newlim->d_fieldmask & QC_SPC_TIMER)
346 xfs_setqlim_timer(mp, res, qlim, newlim->d_spc_timer);
347
348 /* Blocks on the realtime device. */
349 hard = (newlim->d_fieldmask & QC_RT_SPC_HARD) ?
350 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_rt_spc_hardlimit) :
351 dqp->q_rtb.hardlimit;
352 soft = (newlim->d_fieldmask & QC_RT_SPC_SOFT) ?
353 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_rt_spc_softlimit) :
354 dqp->q_rtb.softlimit;
355 res = &dqp->q_rtb;
356 qlim = id == 0 ? &defq->rtb : NULL;
357
358 xfs_setqlim_limits(mp, res, qlim, hard, soft, "rtb");
359 if (newlim->d_fieldmask & QC_RT_SPC_TIMER)
360 xfs_setqlim_timer(mp, res, qlim, newlim->d_rt_spc_timer);
361
362 /* Inodes */
363 hard = (newlim->d_fieldmask & QC_INO_HARD) ?
364 (xfs_qcnt_t) newlim->d_ino_hardlimit :
365 dqp->q_ino.hardlimit;
366 soft = (newlim->d_fieldmask & QC_INO_SOFT) ?
367 (xfs_qcnt_t) newlim->d_ino_softlimit :
368 dqp->q_ino.softlimit;
369 res = &dqp->q_ino;
370 qlim = id == 0 ? &defq->ino : NULL;
371
372 xfs_setqlim_limits(mp, res, qlim, hard, soft, "ino");
373 if (newlim->d_fieldmask & QC_INO_TIMER)
374 xfs_setqlim_timer(mp, res, qlim, newlim->d_ino_timer);
375
376 if (id != 0) {
377 /*
378 * If the user is now over quota, start the timelimit.
379 * The user will not be 'warned'.
380 * Note that we keep the timers ticking, whether enforcement
381 * is on or off. We don't really want to bother with iterating
382 * over all ondisk dquots and turning the timers on/off.
383 */
384 xfs_qm_adjust_dqtimers(dqp);
385 }
386 dqp->q_flags |= XFS_DQFLAG_DIRTY;
387 xfs_trans_log_dquot(tp, dqp);
388
389 error = xfs_trans_commit(tp);
390
391 out_rele:
392 xfs_qm_dqrele(dqp);
393 return error;
394 }
395
396 /* Fill out the quota context. */
397 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)398 xfs_qm_scall_getquota_fill_qc(
399 struct xfs_mount *mp,
400 xfs_dqtype_t type,
401 const struct xfs_dquot *dqp,
402 struct qc_dqblk *dst)
403 {
404 memset(dst, 0, sizeof(*dst));
405 dst->d_spc_hardlimit = XFS_FSB_TO_B(mp, dqp->q_blk.hardlimit);
406 dst->d_spc_softlimit = XFS_FSB_TO_B(mp, dqp->q_blk.softlimit);
407 dst->d_ino_hardlimit = dqp->q_ino.hardlimit;
408 dst->d_ino_softlimit = dqp->q_ino.softlimit;
409 dst->d_space = XFS_FSB_TO_B(mp, dqp->q_blk.reserved);
410 dst->d_ino_count = dqp->q_ino.reserved;
411 dst->d_spc_timer = dqp->q_blk.timer;
412 dst->d_ino_timer = dqp->q_ino.timer;
413 dst->d_ino_warns = 0;
414 dst->d_spc_warns = 0;
415 dst->d_rt_spc_hardlimit = XFS_FSB_TO_B(mp, dqp->q_rtb.hardlimit);
416 dst->d_rt_spc_softlimit = XFS_FSB_TO_B(mp, dqp->q_rtb.softlimit);
417 dst->d_rt_space = XFS_FSB_TO_B(mp, dqp->q_rtb.reserved);
418 dst->d_rt_spc_timer = dqp->q_rtb.timer;
419 dst->d_rt_spc_warns = 0;
420
421 /*
422 * Internally, we don't reset all the timers when quota enforcement
423 * gets turned off. No need to confuse the user level code,
424 * so return zeroes in that case.
425 */
426 if (!xfs_dquot_is_enforced(dqp)) {
427 dst->d_spc_timer = 0;
428 dst->d_ino_timer = 0;
429 dst->d_rt_spc_timer = 0;
430 }
431
432 #ifdef DEBUG
433 if (xfs_dquot_is_enforced(dqp) && dqp->q_id != 0) {
434 if ((dst->d_space > dst->d_spc_softlimit) &&
435 (dst->d_spc_softlimit > 0)) {
436 ASSERT(dst->d_spc_timer != 0);
437 }
438 if ((dst->d_ino_count > dqp->q_ino.softlimit) &&
439 (dqp->q_ino.softlimit > 0)) {
440 ASSERT(dst->d_ino_timer != 0);
441 }
442 }
443 #endif
444 }
445
446 /* Return the quota information for the dquot matching id. */
447 int
xfs_qm_scall_getquota(struct xfs_mount * mp,xfs_dqid_t id,xfs_dqtype_t type,struct qc_dqblk * dst)448 xfs_qm_scall_getquota(
449 struct xfs_mount *mp,
450 xfs_dqid_t id,
451 xfs_dqtype_t type,
452 struct qc_dqblk *dst)
453 {
454 struct xfs_dquot *dqp;
455 int error;
456
457 /*
458 * Expedite pending inodegc work at the start of a quota reporting
459 * scan but don't block waiting for it to complete.
460 */
461 if (id == 0)
462 xfs_inodegc_push(mp);
463
464 /*
465 * Try to get the dquot. We don't want it allocated on disk, so don't
466 * set doalloc. If it doesn't exist, we'll get ENOENT back.
467 */
468 error = xfs_qm_dqget(mp, id, type, false, &dqp);
469 if (error)
470 return error;
471
472 /*
473 * If everything's NULL, this dquot doesn't quite exist as far as
474 * our utility programs are concerned.
475 */
476 if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
477 error = -ENOENT;
478 goto out_put;
479 }
480
481 xfs_qm_scall_getquota_fill_qc(mp, type, dqp, dst);
482
483 out_put:
484 xfs_qm_dqput(dqp);
485 return error;
486 }
487
488 /*
489 * Return the quota information for the first initialized dquot whose id
490 * is at least as high as id.
491 */
492 int
xfs_qm_scall_getquota_next(struct xfs_mount * mp,xfs_dqid_t * id,xfs_dqtype_t type,struct qc_dqblk * dst)493 xfs_qm_scall_getquota_next(
494 struct xfs_mount *mp,
495 xfs_dqid_t *id,
496 xfs_dqtype_t type,
497 struct qc_dqblk *dst)
498 {
499 struct xfs_dquot *dqp;
500 int error;
501
502 /* Flush inodegc work at the start of a quota reporting scan. */
503 if (*id == 0)
504 xfs_inodegc_push(mp);
505
506 error = xfs_qm_dqget_next(mp, *id, type, &dqp);
507 if (error)
508 return error;
509
510 /* Fill in the ID we actually read from disk */
511 *id = dqp->q_id;
512
513 xfs_qm_scall_getquota_fill_qc(mp, type, dqp, dst);
514
515 xfs_qm_dqput(dqp);
516 return error;
517 }
518