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
22int
23xfs_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(lock: &mp->m_sb_lock);
45 mp->m_sb.sb_qflags = mp->m_qflags;
46 spin_unlock(lock: &mp->m_sb_lock);
47 mutex_unlock(lock: &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
53STATIC int
54xfs_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, resp: &M_RES(mp)->tr_itruncate, blocks: 0, rtextents: 0, flags: 0, tpp: &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
93out_unlock:
94 xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
95out_put:
96 xfs_irele(ip);
97 return error;
98}
99
100int
101xfs_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 */
135int
136xfs_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(lock: &mp->m_sb_lock);
182 qf = mp->m_sb.sb_qflags;
183 mp->m_sb.sb_qflags = qf | flags;
184 spin_unlock(lock: &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(lock: &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 */
225static inline bool
226xfs_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
251static inline void
252xfs_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(grace: 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, timeout: timer);
265 }
266}
267
268/*
269 * Adjust quota limits, and start/stop timers accordingly.
270 */
271int
272xfs_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
307 error = xfs_trans_alloc(mp, resp: &M_RES(mp)->tr_qm_setqlim, blocks: 0, rtextents: 0, flags: 0, tpp: &tp);
308 if (error)
309 goto out_rele;
310
311 mutex_lock(&dqp->q_qlock);
312 xfs_trans_dqjoin(tp, dqp);
313
314 /*
315 * Update quota limits, warnings, and timers, and the defaults
316 * if we're touching id == 0.
317 *
318 * Make sure that hardlimits are >= soft limits before changing.
319 *
320 * Update warnings counter(s) if requested.
321 *
322 * Timelimits for the super user set the relative time the other users
323 * can be over quota for this file system. If it is zero a default is
324 * used. Ditto for the default soft and hard limit values (already
325 * done, above), and for warnings.
326 *
327 * For other IDs, userspace can bump out the grace period if over
328 * the soft limit.
329 */
330
331 /* Blocks on the data device. */
332 hard = (newlim->d_fieldmask & QC_SPC_HARD) ?
333 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_spc_hardlimit) :
334 dqp->q_blk.hardlimit;
335 soft = (newlim->d_fieldmask & QC_SPC_SOFT) ?
336 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_spc_softlimit) :
337 dqp->q_blk.softlimit;
338 res = &dqp->q_blk;
339 qlim = id == 0 ? &defq->blk : NULL;
340
341 if (xfs_setqlim_limits(mp, res, qlim, hard, soft, "blk"))
342 xfs_dquot_set_prealloc_limits(dqp);
343 if (newlim->d_fieldmask & QC_SPC_TIMER)
344 xfs_setqlim_timer(mp, res, qlim, timer: newlim->d_spc_timer);
345
346 /* Blocks on the realtime device. */
347 hard = (newlim->d_fieldmask & QC_RT_SPC_HARD) ?
348 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_rt_spc_hardlimit) :
349 dqp->q_rtb.hardlimit;
350 soft = (newlim->d_fieldmask & QC_RT_SPC_SOFT) ?
351 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_rt_spc_softlimit) :
352 dqp->q_rtb.softlimit;
353 res = &dqp->q_rtb;
354 qlim = id == 0 ? &defq->rtb : NULL;
355
356 xfs_setqlim_limits(mp, res, qlim, hard, soft, "rtb");
357 if (newlim->d_fieldmask & QC_RT_SPC_TIMER)
358 xfs_setqlim_timer(mp, res, qlim, timer: newlim->d_rt_spc_timer);
359
360 /* Inodes */
361 hard = (newlim->d_fieldmask & QC_INO_HARD) ?
362 (xfs_qcnt_t) newlim->d_ino_hardlimit :
363 dqp->q_ino.hardlimit;
364 soft = (newlim->d_fieldmask & QC_INO_SOFT) ?
365 (xfs_qcnt_t) newlim->d_ino_softlimit :
366 dqp->q_ino.softlimit;
367 res = &dqp->q_ino;
368 qlim = id == 0 ? &defq->ino : NULL;
369
370 xfs_setqlim_limits(mp, res, qlim, hard, soft, "ino");
371 if (newlim->d_fieldmask & QC_INO_TIMER)
372 xfs_setqlim_timer(mp, res, qlim, timer: newlim->d_ino_timer);
373
374 if (id != 0) {
375 /*
376 * If the user is now over quota, start the timelimit.
377 * The user will not be 'warned'.
378 * Note that we keep the timers ticking, whether enforcement
379 * is on or off. We don't really want to bother with iterating
380 * over all ondisk dquots and turning the timers on/off.
381 */
382 xfs_qm_adjust_dqtimers(d: dqp);
383 }
384 dqp->q_flags |= XFS_DQFLAG_DIRTY;
385 xfs_trans_log_dquot(tp, dqp);
386
387 error = xfs_trans_commit(tp);
388
389out_rele:
390 xfs_qm_dqrele(dqp);
391 return error;
392}
393
394/* Fill out the quota context. */
395static void
396xfs_qm_scall_getquota_fill_qc(
397 struct xfs_mount *mp,
398 xfs_dqtype_t type,
399 const struct xfs_dquot *dqp,
400 struct qc_dqblk *dst)
401{
402 memset(dst, 0, sizeof(*dst));
403 dst->d_spc_hardlimit = XFS_FSB_TO_B(mp, dqp->q_blk.hardlimit);
404 dst->d_spc_softlimit = XFS_FSB_TO_B(mp, dqp->q_blk.softlimit);
405 dst->d_ino_hardlimit = dqp->q_ino.hardlimit;
406 dst->d_ino_softlimit = dqp->q_ino.softlimit;
407 dst->d_space = XFS_FSB_TO_B(mp, dqp->q_blk.reserved);
408 dst->d_ino_count = dqp->q_ino.reserved;
409 dst->d_spc_timer = dqp->q_blk.timer;
410 dst->d_ino_timer = dqp->q_ino.timer;
411 dst->d_ino_warns = 0;
412 dst->d_spc_warns = 0;
413 dst->d_rt_spc_hardlimit = XFS_FSB_TO_B(mp, dqp->q_rtb.hardlimit);
414 dst->d_rt_spc_softlimit = XFS_FSB_TO_B(mp, dqp->q_rtb.softlimit);
415 dst->d_rt_space = XFS_FSB_TO_B(mp, dqp->q_rtb.reserved);
416 dst->d_rt_spc_timer = dqp->q_rtb.timer;
417 dst->d_rt_spc_warns = 0;
418
419 /*
420 * Internally, we don't reset all the timers when quota enforcement
421 * gets turned off. No need to confuse the user level code,
422 * so return zeroes in that case.
423 */
424 if (!xfs_dquot_is_enforced(dqp)) {
425 dst->d_spc_timer = 0;
426 dst->d_ino_timer = 0;
427 dst->d_rt_spc_timer = 0;
428 }
429}
430
431/* Return the quota information for the dquot matching id. */
432int
433xfs_qm_scall_getquota(
434 struct xfs_mount *mp,
435 xfs_dqid_t id,
436 xfs_dqtype_t type,
437 struct qc_dqblk *dst)
438{
439 struct xfs_dquot *dqp;
440 int error;
441
442 /*
443 * Expedite pending inodegc work at the start of a quota reporting
444 * scan but don't block waiting for it to complete.
445 */
446 if (id == 0)
447 xfs_inodegc_push(mp);
448
449 /*
450 * Try to get the dquot. We don't want it allocated on disk, so don't
451 * set doalloc. If it doesn't exist, we'll get ENOENT back.
452 */
453 error = xfs_qm_dqget(mp, id, type, false, &dqp);
454 if (error)
455 return error;
456
457 /*
458 * If everything's NULL, this dquot doesn't quite exist as far as
459 * our utility programs are concerned.
460 */
461 mutex_lock(&dqp->q_qlock);
462 if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
463 error = -ENOENT;
464 goto out_put;
465 }
466
467 xfs_qm_scall_getquota_fill_qc(mp, type, dqp, dst);
468
469out_put:
470 mutex_unlock(lock: &dqp->q_qlock);
471 xfs_qm_dqrele(dqp);
472 return error;
473}
474
475/*
476 * Return the quota information for the first initialized dquot whose id
477 * is at least as high as id.
478 */
479int
480xfs_qm_scall_getquota_next(
481 struct xfs_mount *mp,
482 xfs_dqid_t *id,
483 xfs_dqtype_t type,
484 struct qc_dqblk *dst)
485{
486 struct xfs_dquot *dqp;
487 int error;
488
489 /* Flush inodegc work at the start of a quota reporting scan. */
490 if (*id == 0)
491 xfs_inodegc_push(mp);
492
493 error = xfs_qm_dqget_next(mp, *id, type, &dqp);
494 if (error)
495 return error;
496
497 /* Fill in the ID we actually read from disk */
498 *id = dqp->q_id;
499
500 xfs_qm_scall_getquota_fill_qc(mp, type, dqp, dst);
501 mutex_unlock(lock: &dqp->q_qlock);
502
503 xfs_qm_dqrele(dqp);
504 return error;
505}
506

source code of linux/fs/xfs/xfs_qm_syscalls.c