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1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10/*
11 * Quota change tags are associated with each transaction that allocates or
12 * deallocates space. Those changes are accumulated locally to each node (in a
13 * per-node file) and then are periodically synced to the quota file. This
14 * avoids the bottleneck of constantly touching the quota file, but introduces
15 * fuzziness in the current usage value of IDs that are being used on different
16 * nodes in the cluster simultaneously. So, it is possible for a user on
17 * multiple nodes to overrun their quota, but that overrun is controlable.
18 * Since quota tags are part of transactions, there is no need for a quota check
19 * program to be run on node crashes or anything like that.
20 *
21 * There are couple of knobs that let the administrator manage the quota
22 * fuzziness. "quota_quantum" sets the maximum time a quota change can be
23 * sitting on one node before being synced to the quota file. (The default is
24 * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency
25 * of quota file syncs increases as the user moves closer to their limit. The
26 * more frequent the syncs, the more accurate the quota enforcement, but that
27 * means that there is more contention between the nodes for the quota file.
28 * The default value is one. This sets the maximum theoretical quota overrun
29 * (with infinite node with infinite bandwidth) to twice the user's limit. (In
30 * practice, the maximum overrun you see should be much less.) A "quota_scale"
31 * number greater than one makes quota syncs more frequent and reduces the
32 * maximum overrun. Numbers less than one (but greater than zero) make quota
33 * syncs less frequent.
34 *
35 * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
36 * the quota file, so it is not being constantly read.
37 */
38
39#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
40
41#include <linux/sched.h>
42#include <linux/slab.h>
43#include <linux/mm.h>
44#include <linux/spinlock.h>
45#include <linux/completion.h>
46#include <linux/buffer_head.h>
47#include <linux/sort.h>
48#include <linux/fs.h>
49#include <linux/bio.h>
50#include <linux/gfs2_ondisk.h>
51#include <linux/kthread.h>
52#include <linux/freezer.h>
53#include <linux/quota.h>
54#include <linux/dqblk_xfs.h>
55#include <linux/lockref.h>
56#include <linux/list_lru.h>
57#include <linux/rcupdate.h>
58#include <linux/rculist_bl.h>
59#include <linux/bit_spinlock.h>
60#include <linux/jhash.h>
61#include <linux/vmalloc.h>
62
63#include "gfs2.h"
64#include "incore.h"
65#include "bmap.h"
66#include "glock.h"
67#include "glops.h"
68#include "log.h"
69#include "meta_io.h"
70#include "quota.h"
71#include "rgrp.h"
72#include "super.h"
73#include "trans.h"
74#include "inode.h"
75#include "util.h"
76
77#define GFS2_QD_HASH_SHIFT 12
78#define GFS2_QD_HASH_SIZE (1 << GFS2_QD_HASH_SHIFT)
79#define GFS2_QD_HASH_MASK (GFS2_QD_HASH_SIZE - 1)
80
81/* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */
82/* -> sd_bitmap_lock */
83static DEFINE_SPINLOCK(qd_lock);
84struct list_lru gfs2_qd_lru;
85
86static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
87
88static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
89 const struct kqid qid)
90{
91 unsigned int h;
92
93 h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
94 h = jhash(&qid, sizeof(struct kqid), h);
95
96 return h & GFS2_QD_HASH_MASK;
97}
98
99static inline void spin_lock_bucket(unsigned int hash)
100{
101 hlist_bl_lock(&qd_hash_table[hash]);
102}
103
104static inline void spin_unlock_bucket(unsigned int hash)
105{
106 hlist_bl_unlock(&qd_hash_table[hash]);
107}
108
109static void gfs2_qd_dealloc(struct rcu_head *rcu)
110{
111 struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
112 kmem_cache_free(gfs2_quotad_cachep, qd);
113}
114
115static void gfs2_qd_dispose(struct list_head *list)
116{
117 struct gfs2_quota_data *qd;
118 struct gfs2_sbd *sdp;
119
120 while (!list_empty(list)) {
121 qd = list_entry(list->next, struct gfs2_quota_data, qd_lru);
122 sdp = qd->qd_gl->gl_name.ln_sbd;
123
124 list_del(&qd->qd_lru);
125
126 /* Free from the filesystem-specific list */
127 spin_lock(&qd_lock);
128 list_del(&qd->qd_list);
129 spin_unlock(&qd_lock);
130
131 spin_lock_bucket(qd->qd_hash);
132 hlist_bl_del_rcu(&qd->qd_hlist);
133 spin_unlock_bucket(qd->qd_hash);
134
135 gfs2_assert_warn(sdp, !qd->qd_change);
136 gfs2_assert_warn(sdp, !qd->qd_slot_count);
137 gfs2_assert_warn(sdp, !qd->qd_bh_count);
138
139 gfs2_glock_put(qd->qd_gl);
140 atomic_dec(&sdp->sd_quota_count);
141
142 /* Delete it from the common reclaim list */
143 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
144 }
145}
146
147
148static enum lru_status gfs2_qd_isolate(struct list_head *item,
149 struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
150{
151 struct list_head *dispose = arg;
152 struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
153
154 if (!spin_trylock(&qd->qd_lockref.lock))
155 return LRU_SKIP;
156
157 if (qd->qd_lockref.count == 0) {
158 lockref_mark_dead(&qd->qd_lockref);
159 list_lru_isolate_move(lru, &qd->qd_lru, dispose);
160 }
161
162 spin_unlock(&qd->qd_lockref.lock);
163 return LRU_REMOVED;
164}
165
166static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
167 struct shrink_control *sc)
168{
169 LIST_HEAD(dispose);
170 unsigned long freed;
171
172 if (!(sc->gfp_mask & __GFP_FS))
173 return SHRINK_STOP;
174
175 freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
176 gfs2_qd_isolate, &dispose);
177
178 gfs2_qd_dispose(&dispose);
179
180 return freed;
181}
182
183static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
184 struct shrink_control *sc)
185{
186 return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
187}
188
189struct shrinker gfs2_qd_shrinker = {
190 .count_objects = gfs2_qd_shrink_count,
191 .scan_objects = gfs2_qd_shrink_scan,
192 .seeks = DEFAULT_SEEKS,
193 .flags = SHRINKER_NUMA_AWARE,
194};
195
196
197static u64 qd2index(struct gfs2_quota_data *qd)
198{
199 struct kqid qid = qd->qd_id;
200 return (2 * (u64)from_kqid(&init_user_ns, qid)) +
201 ((qid.type == USRQUOTA) ? 0 : 1);
202}
203
204static u64 qd2offset(struct gfs2_quota_data *qd)
205{
206 u64 offset;
207
208 offset = qd2index(qd);
209 offset *= sizeof(struct gfs2_quota);
210
211 return offset;
212}
213
214static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
215{
216 struct gfs2_quota_data *qd;
217 int error;
218
219 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
220 if (!qd)
221 return NULL;
222
223 qd->qd_sbd = sdp;
224 qd->qd_lockref.count = 1;
225 spin_lock_init(&qd->qd_lockref.lock);
226 qd->qd_id = qid;
227 qd->qd_slot = -1;
228 INIT_LIST_HEAD(&qd->qd_lru);
229 qd->qd_hash = hash;
230
231 error = gfs2_glock_get(sdp, qd2index(qd),
232 &gfs2_quota_glops, CREATE, &qd->qd_gl);
233 if (error)
234 goto fail;
235
236 return qd;
237
238fail:
239 kmem_cache_free(gfs2_quotad_cachep, qd);
240 return NULL;
241}
242
243static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
244 const struct gfs2_sbd *sdp,
245 struct kqid qid)
246{
247 struct gfs2_quota_data *qd;
248 struct hlist_bl_node *h;
249
250 hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
251 if (!qid_eq(qd->qd_id, qid))
252 continue;
253 if (qd->qd_sbd != sdp)
254 continue;
255 if (lockref_get_not_dead(&qd->qd_lockref)) {
256 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
257 return qd;
258 }
259 }
260
261 return NULL;
262}
263
264
265static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
266 struct gfs2_quota_data **qdp)
267{
268 struct gfs2_quota_data *qd, *new_qd;
269 unsigned int hash = gfs2_qd_hash(sdp, qid);
270
271 rcu_read_lock();
272 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
273 rcu_read_unlock();
274
275 if (qd)
276 return 0;
277
278 new_qd = qd_alloc(hash, sdp, qid);
279 if (!new_qd)
280 return -ENOMEM;
281
282 spin_lock(&qd_lock);
283 spin_lock_bucket(hash);
284 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
285 if (qd == NULL) {
286 *qdp = new_qd;
287 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
288 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
289 atomic_inc(&sdp->sd_quota_count);
290 }
291 spin_unlock_bucket(hash);
292 spin_unlock(&qd_lock);
293
294 if (qd) {
295 gfs2_glock_put(new_qd->qd_gl);
296 kmem_cache_free(gfs2_quotad_cachep, new_qd);
297 }
298
299 return 0;
300}
301
302
303static void qd_hold(struct gfs2_quota_data *qd)
304{
305 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
306 gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
307 lockref_get(&qd->qd_lockref);
308}
309
310static void qd_put(struct gfs2_quota_data *qd)
311{
312 if (lockref_put_or_lock(&qd->qd_lockref))
313 return;
314
315 qd->qd_lockref.count = 0;
316 list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
317 spin_unlock(&qd->qd_lockref.lock);
318
319}
320
321static int slot_get(struct gfs2_quota_data *qd)
322{
323 struct gfs2_sbd *sdp = qd->qd_sbd;
324 unsigned int bit;
325 int error = 0;
326
327 spin_lock(&sdp->sd_bitmap_lock);
328 if (qd->qd_slot_count != 0)
329 goto out;
330
331 error = -ENOSPC;
332 bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
333 if (bit < sdp->sd_quota_slots) {
334 set_bit(bit, sdp->sd_quota_bitmap);
335 qd->qd_slot = bit;
336 error = 0;
337out:
338 qd->qd_slot_count++;
339 }
340 spin_unlock(&sdp->sd_bitmap_lock);
341
342 return error;
343}
344
345static void slot_hold(struct gfs2_quota_data *qd)
346{
347 struct gfs2_sbd *sdp = qd->qd_sbd;
348
349 spin_lock(&sdp->sd_bitmap_lock);
350 gfs2_assert(sdp, qd->qd_slot_count);
351 qd->qd_slot_count++;
352 spin_unlock(&sdp->sd_bitmap_lock);
353}
354
355static void slot_put(struct gfs2_quota_data *qd)
356{
357 struct gfs2_sbd *sdp = qd->qd_sbd;
358
359 spin_lock(&sdp->sd_bitmap_lock);
360 gfs2_assert(sdp, qd->qd_slot_count);
361 if (!--qd->qd_slot_count) {
362 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
363 qd->qd_slot = -1;
364 }
365 spin_unlock(&sdp->sd_bitmap_lock);
366}
367
368static int bh_get(struct gfs2_quota_data *qd)
369{
370 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
371 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
372 unsigned int block, offset;
373 struct buffer_head *bh;
374 int error;
375 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
376
377 mutex_lock(&sdp->sd_quota_mutex);
378
379 if (qd->qd_bh_count++) {
380 mutex_unlock(&sdp->sd_quota_mutex);
381 return 0;
382 }
383
384 block = qd->qd_slot / sdp->sd_qc_per_block;
385 offset = qd->qd_slot % sdp->sd_qc_per_block;
386
387 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
388 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
389 if (error)
390 goto fail;
391 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, 0, &bh);
392 if (error)
393 goto fail;
394 error = -EIO;
395 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
396 goto fail_brelse;
397
398 qd->qd_bh = bh;
399 qd->qd_bh_qc = (struct gfs2_quota_change *)
400 (bh->b_data + sizeof(struct gfs2_meta_header) +
401 offset * sizeof(struct gfs2_quota_change));
402
403 mutex_unlock(&sdp->sd_quota_mutex);
404
405 return 0;
406
407fail_brelse:
408 brelse(bh);
409fail:
410 qd->qd_bh_count--;
411 mutex_unlock(&sdp->sd_quota_mutex);
412 return error;
413}
414
415static void bh_put(struct gfs2_quota_data *qd)
416{
417 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
418
419 mutex_lock(&sdp->sd_quota_mutex);
420 gfs2_assert(sdp, qd->qd_bh_count);
421 if (!--qd->qd_bh_count) {
422 brelse(qd->qd_bh);
423 qd->qd_bh = NULL;
424 qd->qd_bh_qc = NULL;
425 }
426 mutex_unlock(&sdp->sd_quota_mutex);
427}
428
429static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
430 u64 *sync_gen)
431{
432 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
433 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
434 (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
435 return 0;
436
437 if (!lockref_get_not_dead(&qd->qd_lockref))
438 return 0;
439
440 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
441 set_bit(QDF_LOCKED, &qd->qd_flags);
442 qd->qd_change_sync = qd->qd_change;
443 slot_hold(qd);
444 return 1;
445}
446
447static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
448{
449 struct gfs2_quota_data *qd = NULL;
450 int error;
451 int found = 0;
452
453 *qdp = NULL;
454
455 if (sdp->sd_vfs->s_flags & MS_RDONLY)
456 return 0;
457
458 spin_lock(&qd_lock);
459
460 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
461 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
462 if (found)
463 break;
464 }
465
466 if (!found)
467 qd = NULL;
468
469 spin_unlock(&qd_lock);
470
471 if (qd) {
472 gfs2_assert_warn(sdp, qd->qd_change_sync);
473 error = bh_get(qd);
474 if (error) {
475 clear_bit(QDF_LOCKED, &qd->qd_flags);
476 slot_put(qd);
477 qd_put(qd);
478 return error;
479 }
480 }
481
482 *qdp = qd;
483
484 return 0;
485}
486
487static void qd_unlock(struct gfs2_quota_data *qd)
488{
489 gfs2_assert_warn(qd->qd_gl->gl_name.ln_sbd,
490 test_bit(QDF_LOCKED, &qd->qd_flags));
491 clear_bit(QDF_LOCKED, &qd->qd_flags);
492 bh_put(qd);
493 slot_put(qd);
494 qd_put(qd);
495}
496
497static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
498 struct gfs2_quota_data **qdp)
499{
500 int error;
501
502 error = qd_get(sdp, qid, qdp);
503 if (error)
504 return error;
505
506 error = slot_get(*qdp);
507 if (error)
508 goto fail;
509
510 error = bh_get(*qdp);
511 if (error)
512 goto fail_slot;
513
514 return 0;
515
516fail_slot:
517 slot_put(*qdp);
518fail:
519 qd_put(*qdp);
520 return error;
521}
522
523static void qdsb_put(struct gfs2_quota_data *qd)
524{
525 bh_put(qd);
526 slot_put(qd);
527 qd_put(qd);
528}
529
530/**
531 * gfs2_qa_alloc - make sure we have a quota allocations data structure,
532 * if necessary
533 * @ip: the inode for this reservation
534 */
535int gfs2_qa_alloc(struct gfs2_inode *ip)
536{
537 int error = 0;
538 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
539
540 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
541 return 0;
542
543 down_write(&ip->i_rw_mutex);
544 if (ip->i_qadata == NULL) {
545 ip->i_qadata = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
546 if (!ip->i_qadata)
547 error = -ENOMEM;
548 }
549 up_write(&ip->i_rw_mutex);
550 return error;
551}
552
553void gfs2_qa_delete(struct gfs2_inode *ip, atomic_t *wcount)
554{
555 down_write(&ip->i_rw_mutex);
556 if (ip->i_qadata && ((wcount == NULL) || (atomic_read(wcount) <= 1))) {
557 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
558 ip->i_qadata = NULL;
559 }
560 up_write(&ip->i_rw_mutex);
561}
562
563int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
564{
565 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
566 struct gfs2_quota_data **qd;
567 int error;
568
569 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
570 return 0;
571
572 if (ip->i_qadata == NULL) {
573 error = gfs2_rsqa_alloc(ip);
574 if (error)
575 return error;
576 }
577
578 qd = ip->i_qadata->qa_qd;
579
580 if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
581 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
582 return -EIO;
583
584 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
585 if (error)
586 goto out;
587 ip->i_qadata->qa_qd_num++;
588 qd++;
589
590 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
591 if (error)
592 goto out;
593 ip->i_qadata->qa_qd_num++;
594 qd++;
595
596 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
597 !uid_eq(uid, ip->i_inode.i_uid)) {
598 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
599 if (error)
600 goto out;
601 ip->i_qadata->qa_qd_num++;
602 qd++;
603 }
604
605 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
606 !gid_eq(gid, ip->i_inode.i_gid)) {
607 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
608 if (error)
609 goto out;
610 ip->i_qadata->qa_qd_num++;
611 qd++;
612 }
613
614out:
615 if (error)
616 gfs2_quota_unhold(ip);
617 return error;
618}
619
620void gfs2_quota_unhold(struct gfs2_inode *ip)
621{
622 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
623 u32 x;
624
625 if (ip->i_qadata == NULL)
626 return;
627 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
628
629 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
630 qdsb_put(ip->i_qadata->qa_qd[x]);
631 ip->i_qadata->qa_qd[x] = NULL;
632 }
633 ip->i_qadata->qa_qd_num = 0;
634}
635
636static int sort_qd(const void *a, const void *b)
637{
638 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
639 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
640
641 if (qid_lt(qd_a->qd_id, qd_b->qd_id))
642 return -1;
643 if (qid_lt(qd_b->qd_id, qd_a->qd_id))
644 return 1;
645 return 0;
646}
647
648static void do_qc(struct gfs2_quota_data *qd, s64 change)
649{
650 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
651 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
652 struct gfs2_quota_change *qc = qd->qd_bh_qc;
653 s64 x;
654
655 mutex_lock(&sdp->sd_quota_mutex);
656 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
657
658 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
659 qc->qc_change = 0;
660 qc->qc_flags = 0;
661 if (qd->qd_id.type == USRQUOTA)
662 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
663 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
664 }
665
666 x = be64_to_cpu(qc->qc_change) + change;
667 qc->qc_change = cpu_to_be64(x);
668
669 spin_lock(&qd_lock);
670 qd->qd_change = x;
671 spin_unlock(&qd_lock);
672
673 if (!x) {
674 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
675 clear_bit(QDF_CHANGE, &qd->qd_flags);
676 qc->qc_flags = 0;
677 qc->qc_id = 0;
678 slot_put(qd);
679 qd_put(qd);
680 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
681 qd_hold(qd);
682 slot_hold(qd);
683 }
684
685 if (change < 0) /* Reset quiet flag if we freed some blocks */
686 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
687 mutex_unlock(&sdp->sd_quota_mutex);
688}
689
690static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
691 unsigned off, void *buf, unsigned bytes)
692{
693 struct inode *inode = &ip->i_inode;
694 struct gfs2_sbd *sdp = GFS2_SB(inode);
695 struct address_space *mapping = inode->i_mapping;
696 struct page *page;
697 struct buffer_head *bh;
698 void *kaddr;
699 u64 blk;
700 unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
701 unsigned to_write = bytes, pg_off = off;
702 int done = 0;
703
704 blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
705 boff = off % bsize;
706
707 page = find_or_create_page(mapping, index, GFP_NOFS);
708 if (!page)
709 return -ENOMEM;
710 if (!page_has_buffers(page))
711 create_empty_buffers(page, bsize, 0);
712
713 bh = page_buffers(page);
714 while (!done) {
715 /* Find the beginning block within the page */
716 if (pg_off >= ((bnum * bsize) + bsize)) {
717 bh = bh->b_this_page;
718 bnum++;
719 blk++;
720 continue;
721 }
722 if (!buffer_mapped(bh)) {
723 gfs2_block_map(inode, blk, bh, 1);
724 if (!buffer_mapped(bh))
725 goto unlock_out;
726 /* If it's a newly allocated disk block, zero it */
727 if (buffer_new(bh))
728 zero_user(page, bnum * bsize, bh->b_size);
729 }
730 if (PageUptodate(page))
731 set_buffer_uptodate(bh);
732 if (!buffer_uptodate(bh)) {
733 ll_rw_block(READ | REQ_META, 1, &bh);
734 wait_on_buffer(bh);
735 if (!buffer_uptodate(bh))
736 goto unlock_out;
737 }
738 gfs2_trans_add_data(ip->i_gl, bh);
739
740 /* If we need to write to the next block as well */
741 if (to_write > (bsize - boff)) {
742 pg_off += (bsize - boff);
743 to_write -= (bsize - boff);
744 boff = pg_off % bsize;
745 continue;
746 }
747 done = 1;
748 }
749
750 /* Write to the page, now that we have setup the buffer(s) */
751 kaddr = kmap_atomic(page);
752 memcpy(kaddr + off, buf, bytes);
753 flush_dcache_page(page);
754 kunmap_atomic(kaddr);
755 unlock_page(page);
756 put_page(page);
757
758 return 0;
759
760unlock_out:
761 unlock_page(page);
762 put_page(page);
763 return -EIO;
764}
765
766static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp,
767 loff_t loc)
768{
769 unsigned long pg_beg;
770 unsigned pg_off, nbytes, overflow = 0;
771 int pg_oflow = 0, error;
772 void *ptr;
773
774 nbytes = sizeof(struct gfs2_quota);
775
776 pg_beg = loc >> PAGE_SHIFT;
777 pg_off = loc % PAGE_SIZE;
778
779 /* If the quota straddles a page boundary, split the write in two */
780 if ((pg_off + nbytes) > PAGE_SIZE) {
781 pg_oflow = 1;
782 overflow = (pg_off + nbytes) - PAGE_SIZE;
783 }
784
785 ptr = qp;
786 error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr,
787 nbytes - overflow);
788 /* If there's an overflow, write the remaining bytes to the next page */
789 if (!error && pg_oflow)
790 error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0,
791 ptr + nbytes - overflow,
792 overflow);
793 return error;
794}
795
796/**
797 * gfs2_adjust_quota - adjust record of current block usage
798 * @ip: The quota inode
799 * @loc: Offset of the entry in the quota file
800 * @change: The amount of usage change to record
801 * @qd: The quota data
802 * @fdq: The updated limits to record
803 *
804 * This function was mostly borrowed from gfs2_block_truncate_page which was
805 * in turn mostly borrowed from ext3
806 *
807 * Returns: 0 or -ve on error
808 */
809
810static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
811 s64 change, struct gfs2_quota_data *qd,
812 struct qc_dqblk *fdq)
813{
814 struct inode *inode = &ip->i_inode;
815 struct gfs2_sbd *sdp = GFS2_SB(inode);
816 struct gfs2_quota q;
817 int err;
818 u64 size;
819
820 if (gfs2_is_stuffed(ip)) {
821 err = gfs2_unstuff_dinode(ip, NULL);
822 if (err)
823 return err;
824 }
825
826 memset(&q, 0, sizeof(struct gfs2_quota));
827 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
828 if (err < 0)
829 return err;
830
831 loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
832 err = -EIO;
833 be64_add_cpu(&q.qu_value, change);
834 if (((s64)be64_to_cpu(q.qu_value)) < 0)
835 q.qu_value = 0; /* Never go negative on quota usage */
836 qd->qd_qb.qb_value = q.qu_value;
837 if (fdq) {
838 if (fdq->d_fieldmask & QC_SPC_SOFT) {
839 q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
840 qd->qd_qb.qb_warn = q.qu_warn;
841 }
842 if (fdq->d_fieldmask & QC_SPC_HARD) {
843 q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
844 qd->qd_qb.qb_limit = q.qu_limit;
845 }
846 if (fdq->d_fieldmask & QC_SPACE) {
847 q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
848 qd->qd_qb.qb_value = q.qu_value;
849 }
850 }
851
852 err = gfs2_write_disk_quota(ip, &q, loc);
853 if (!err) {
854 size = loc + sizeof(struct gfs2_quota);
855 if (size > inode->i_size)
856 i_size_write(inode, size);
857 inode->i_mtime = inode->i_atime = CURRENT_TIME;
858 mark_inode_dirty(inode);
859 set_bit(QDF_REFRESH, &qd->qd_flags);
860 }
861
862 return err;
863}
864
865static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
866{
867 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_name.ln_sbd;
868 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
869 struct gfs2_alloc_parms ap = { .aflags = 0, };
870 unsigned int data_blocks, ind_blocks;
871 struct gfs2_holder *ghs, i_gh;
872 unsigned int qx, x;
873 struct gfs2_quota_data *qd;
874 unsigned reserved;
875 loff_t offset;
876 unsigned int nalloc = 0, blocks;
877 int error;
878
879 error = gfs2_rsqa_alloc(ip);
880 if (error)
881 return error;
882
883 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
884 &data_blocks, &ind_blocks);
885
886 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
887 if (!ghs)
888 return -ENOMEM;
889
890 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
891 inode_lock(&ip->i_inode);
892 for (qx = 0; qx < num_qd; qx++) {
893 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
894 GL_NOCACHE, &ghs[qx]);
895 if (error)
896 goto out;
897 }
898
899 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
900 if (error)
901 goto out;
902
903 for (x = 0; x < num_qd; x++) {
904 offset = qd2offset(qda[x]);
905 if (gfs2_write_alloc_required(ip, offset,
906 sizeof(struct gfs2_quota)))
907 nalloc++;
908 }
909
910 /*
911 * 1 blk for unstuffing inode if stuffed. We add this extra
912 * block to the reservation unconditionally. If the inode
913 * doesn't need unstuffing, the block will be released to the
914 * rgrp since it won't be allocated during the transaction
915 */
916 /* +3 in the end for unstuffing block, inode size update block
917 * and another block in case quota straddles page boundary and
918 * two blocks need to be updated instead of 1 */
919 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
920
921 reserved = 1 + (nalloc * (data_blocks + ind_blocks));
922 ap.target = reserved;
923 error = gfs2_inplace_reserve(ip, &ap);
924 if (error)
925 goto out_alloc;
926
927 if (nalloc)
928 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
929
930 error = gfs2_trans_begin(sdp, blocks, 0);
931 if (error)
932 goto out_ipres;
933
934 for (x = 0; x < num_qd; x++) {
935 qd = qda[x];
936 offset = qd2offset(qd);
937 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
938 if (error)
939 goto out_end_trans;
940
941 do_qc(qd, -qd->qd_change_sync);
942 set_bit(QDF_REFRESH, &qd->qd_flags);
943 }
944
945 error = 0;
946
947out_end_trans:
948 gfs2_trans_end(sdp);
949out_ipres:
950 gfs2_inplace_release(ip);
951out_alloc:
952 gfs2_glock_dq_uninit(&i_gh);
953out:
954 while (qx--)
955 gfs2_glock_dq_uninit(&ghs[qx]);
956 inode_unlock(&ip->i_inode);
957 kfree(ghs);
958 gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl, NORMAL_FLUSH);
959 return error;
960}
961
962static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
963{
964 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
965 struct gfs2_quota q;
966 struct gfs2_quota_lvb *qlvb;
967 loff_t pos;
968 int error;
969
970 memset(&q, 0, sizeof(struct gfs2_quota));
971 pos = qd2offset(qd);
972 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
973 if (error < 0)
974 return error;
975
976 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
977 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
978 qlvb->__pad = 0;
979 qlvb->qb_limit = q.qu_limit;
980 qlvb->qb_warn = q.qu_warn;
981 qlvb->qb_value = q.qu_value;
982 qd->qd_qb = *qlvb;
983
984 return 0;
985}
986
987static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
988 struct gfs2_holder *q_gh)
989{
990 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
991 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
992 struct gfs2_holder i_gh;
993 int error;
994
995restart:
996 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
997 if (error)
998 return error;
999
1000 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1001 force_refresh = FORCE;
1002
1003 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1004
1005 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1006 gfs2_glock_dq_uninit(q_gh);
1007 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1008 GL_NOCACHE, q_gh);
1009 if (error)
1010 return error;
1011
1012 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1013 if (error)
1014 goto fail;
1015
1016 error = update_qd(sdp, qd);
1017 if (error)
1018 goto fail_gunlock;
1019
1020 gfs2_glock_dq_uninit(&i_gh);
1021 gfs2_glock_dq_uninit(q_gh);
1022 force_refresh = 0;
1023 goto restart;
1024 }
1025
1026 return 0;
1027
1028fail_gunlock:
1029 gfs2_glock_dq_uninit(&i_gh);
1030fail:
1031 gfs2_glock_dq_uninit(q_gh);
1032 return error;
1033}
1034
1035int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1036{
1037 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1038 struct gfs2_quota_data *qd;
1039 u32 x;
1040 int error = 0;
1041
1042 if (capable(CAP_SYS_RESOURCE) ||
1043 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1044 return 0;
1045
1046 error = gfs2_quota_hold(ip, uid, gid);
1047 if (error)
1048 return error;
1049
1050 sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1051 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1052
1053 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1054 qd = ip->i_qadata->qa_qd[x];
1055 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1056 if (error)
1057 break;
1058 }
1059
1060 if (!error)
1061 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1062 else {
1063 while (x--)
1064 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1065 gfs2_quota_unhold(ip);
1066 }
1067
1068 return error;
1069}
1070
1071static int need_sync(struct gfs2_quota_data *qd)
1072{
1073 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1074 struct gfs2_tune *gt = &sdp->sd_tune;
1075 s64 value;
1076 unsigned int num, den;
1077 int do_sync = 1;
1078
1079 if (!qd->qd_qb.qb_limit)
1080 return 0;
1081
1082 spin_lock(&qd_lock);
1083 value = qd->qd_change;
1084 spin_unlock(&qd_lock);
1085
1086 spin_lock(>->gt_spin);
1087 num = gt->gt_quota_scale_num;
1088 den = gt->gt_quota_scale_den;
1089 spin_unlock(>->gt_spin);
1090
1091 if (value < 0)
1092 do_sync = 0;
1093 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1094 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1095 do_sync = 0;
1096 else {
1097 value *= gfs2_jindex_size(sdp) * num;
1098 value = div_s64(value, den);
1099 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1100 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1101 do_sync = 0;
1102 }
1103
1104 return do_sync;
1105}
1106
1107void gfs2_quota_unlock(struct gfs2_inode *ip)
1108{
1109 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1110 struct gfs2_quota_data *qda[4];
1111 unsigned int count = 0;
1112 u32 x;
1113 int found;
1114
1115 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1116 goto out;
1117
1118 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1119 struct gfs2_quota_data *qd;
1120 int sync;
1121
1122 qd = ip->i_qadata->qa_qd[x];
1123 sync = need_sync(qd);
1124
1125 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1126 if (!sync)
1127 continue;
1128
1129 spin_lock(&qd_lock);
1130 found = qd_check_sync(sdp, qd, NULL);
1131 spin_unlock(&qd_lock);
1132
1133 if (!found)
1134 continue;
1135
1136 gfs2_assert_warn(sdp, qd->qd_change_sync);
1137 if (bh_get(qd)) {
1138 clear_bit(QDF_LOCKED, &qd->qd_flags);
1139 slot_put(qd);
1140 qd_put(qd);
1141 continue;
1142 }
1143
1144 qda[count++] = qd;
1145 }
1146
1147 if (count) {
1148 do_sync(count, qda);
1149 for (x = 0; x < count; x++)
1150 qd_unlock(qda[x]);
1151 }
1152
1153out:
1154 gfs2_quota_unhold(ip);
1155}
1156
1157#define MAX_LINE 256
1158
1159static int print_message(struct gfs2_quota_data *qd, char *type)
1160{
1161 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1162
1163 fs_info(sdp, "quota %s for %s %u\n",
1164 type,
1165 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1166 from_kqid(&init_user_ns, qd->qd_id));
1167
1168 return 0;
1169}
1170
1171/**
1172 * gfs2_quota_check - check if allocating new blocks will exceed quota
1173 * @ip: The inode for which this check is being performed
1174 * @uid: The uid to check against
1175 * @gid: The gid to check against
1176 * @ap: The allocation parameters. ap->target contains the requested
1177 * blocks. ap->min_target, if set, contains the minimum blks
1178 * requested.
1179 *
1180 * Returns: 0 on success.
1181 * min_req = ap->min_target ? ap->min_target : ap->target;
1182 * quota must allow atleast min_req blks for success and
1183 * ap->allowed is set to the number of blocks allowed
1184 *
1185 * -EDQUOT otherwise, quota violation. ap->allowed is set to number
1186 * of blocks available.
1187 */
1188int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1189 struct gfs2_alloc_parms *ap)
1190{
1191 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1192 struct gfs2_quota_data *qd;
1193 s64 value, warn, limit;
1194 u32 x;
1195 int error = 0;
1196
1197 ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1198 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1199 return 0;
1200
1201 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1202 return 0;
1203
1204 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1205 qd = ip->i_qadata->qa_qd[x];
1206
1207 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1208 qid_eq(qd->qd_id, make_kqid_gid(gid))))
1209 continue;
1210
1211 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1212 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1213 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1214 spin_lock(&qd_lock);
1215 value += qd->qd_change;
1216 spin_unlock(&qd_lock);
1217
1218 if (limit > 0 && (limit - value) < ap->allowed)
1219 ap->allowed = limit - value;
1220 /* If we can't meet the target */
1221 if (limit && limit < (value + (s64)ap->target)) {
1222 /* If no min_target specified or we don't meet
1223 * min_target, return -EDQUOT */
1224 if (!ap->min_target || ap->min_target > ap->allowed) {
1225 if (!test_and_set_bit(QDF_QMSG_QUIET,
1226 &qd->qd_flags)) {
1227 print_message(qd, "exceeded");
1228 quota_send_warning(qd->qd_id,
1229 sdp->sd_vfs->s_dev,
1230 QUOTA_NL_BHARDWARN);
1231 }
1232 error = -EDQUOT;
1233 break;
1234 }
1235 } else if (warn && warn < value &&
1236 time_after_eq(jiffies, qd->qd_last_warn +
1237 gfs2_tune_get(sdp, gt_quota_warn_period)
1238 * HZ)) {
1239 quota_send_warning(qd->qd_id,
1240 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1241 error = print_message(qd, "warning");
1242 qd->qd_last_warn = jiffies;
1243 }
1244 }
1245 return error;
1246}
1247
1248void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1249 kuid_t uid, kgid_t gid)
1250{
1251 struct gfs2_quota_data *qd;
1252 u32 x;
1253 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1254
1255 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON ||
1256 gfs2_assert_warn(sdp, change))
1257 return;
1258 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1259 return;
1260
1261 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1262 qd = ip->i_qadata->qa_qd[x];
1263
1264 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1265 qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1266 do_qc(qd, change);
1267 }
1268 }
1269}
1270
1271int gfs2_quota_sync(struct super_block *sb, int type)
1272{
1273 struct gfs2_sbd *sdp = sb->s_fs_info;
1274 struct gfs2_quota_data **qda;
1275 unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
1276 unsigned int num_qd;
1277 unsigned int x;
1278 int error = 0;
1279
1280 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1281 if (!qda)
1282 return -ENOMEM;
1283
1284 mutex_lock(&sdp->sd_quota_sync_mutex);
1285 sdp->sd_quota_sync_gen++;
1286
1287 do {
1288 num_qd = 0;
1289
1290 for (;;) {
1291 error = qd_fish(sdp, qda + num_qd);
1292 if (error || !qda[num_qd])
1293 break;
1294 if (++num_qd == max_qd)
1295 break;
1296 }
1297
1298 if (num_qd) {
1299 if (!error)
1300 error = do_sync(num_qd, qda);
1301 if (!error)
1302 for (x = 0; x < num_qd; x++)
1303 qda[x]->qd_sync_gen =
1304 sdp->sd_quota_sync_gen;
1305
1306 for (x = 0; x < num_qd; x++)
1307 qd_unlock(qda[x]);
1308 }
1309 } while (!error && num_qd == max_qd);
1310
1311 mutex_unlock(&sdp->sd_quota_sync_mutex);
1312 kfree(qda);
1313
1314 return error;
1315}
1316
1317int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1318{
1319 struct gfs2_quota_data *qd;
1320 struct gfs2_holder q_gh;
1321 int error;
1322
1323 error = qd_get(sdp, qid, &qd);
1324 if (error)
1325 return error;
1326
1327 error = do_glock(qd, FORCE, &q_gh);
1328 if (!error)
1329 gfs2_glock_dq_uninit(&q_gh);
1330
1331 qd_put(qd);
1332 return error;
1333}
1334
1335int gfs2_quota_init(struct gfs2_sbd *sdp)
1336{
1337 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1338 u64 size = i_size_read(sdp->sd_qc_inode);
1339 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1340 unsigned int x, slot = 0;
1341 unsigned int found = 0;
1342 unsigned int hash;
1343 unsigned int bm_size;
1344 u64 dblock;
1345 u32 extlen = 0;
1346 int error;
1347
1348 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1349 return -EIO;
1350
1351 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1352 bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1353 bm_size *= sizeof(unsigned long);
1354 error = -ENOMEM;
1355 sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1356 if (sdp->sd_quota_bitmap == NULL)
1357 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1358 __GFP_ZERO, PAGE_KERNEL);
1359 if (!sdp->sd_quota_bitmap)
1360 return error;
1361
1362 for (x = 0; x < blocks; x++) {
1363 struct buffer_head *bh;
1364 const struct gfs2_quota_change *qc;
1365 unsigned int y;
1366
1367 if (!extlen) {
1368 int new = 0;
1369 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1370 if (error)
1371 goto fail;
1372 }
1373 error = -EIO;
1374 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1375 if (!bh)
1376 goto fail;
1377 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1378 brelse(bh);
1379 goto fail;
1380 }
1381
1382 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1383 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1384 y++, slot++) {
1385 struct gfs2_quota_data *qd;
1386 s64 qc_change = be64_to_cpu(qc->qc_change);
1387 u32 qc_flags = be32_to_cpu(qc->qc_flags);
1388 enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1389 USRQUOTA : GRPQUOTA;
1390 struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1391 be32_to_cpu(qc->qc_id));
1392 qc++;
1393 if (!qc_change)
1394 continue;
1395
1396 hash = gfs2_qd_hash(sdp, qc_id);
1397 qd = qd_alloc(hash, sdp, qc_id);
1398 if (qd == NULL) {
1399 brelse(bh);
1400 goto fail;
1401 }
1402
1403 set_bit(QDF_CHANGE, &qd->qd_flags);
1404 qd->qd_change = qc_change;
1405 qd->qd_slot = slot;
1406 qd->qd_slot_count = 1;
1407
1408 spin_lock(&qd_lock);
1409 BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1410 list_add(&qd->qd_list, &sdp->sd_quota_list);
1411 atomic_inc(&sdp->sd_quota_count);
1412 spin_unlock(&qd_lock);
1413
1414 spin_lock_bucket(hash);
1415 hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1416 spin_unlock_bucket(hash);
1417
1418 found++;
1419 }
1420
1421 brelse(bh);
1422 dblock++;
1423 extlen--;
1424 }
1425
1426 if (found)
1427 fs_info(sdp, "found %u quota changes\n", found);
1428
1429 return 0;
1430
1431fail:
1432 gfs2_quota_cleanup(sdp);
1433 return error;
1434}
1435
1436void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1437{
1438 struct list_head *head = &sdp->sd_quota_list;
1439 struct gfs2_quota_data *qd;
1440
1441 spin_lock(&qd_lock);
1442 while (!list_empty(head)) {
1443 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1444
1445 list_del(&qd->qd_list);
1446
1447 /* Also remove if this qd exists in the reclaim list */
1448 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1449 atomic_dec(&sdp->sd_quota_count);
1450 spin_unlock(&qd_lock);
1451
1452 spin_lock_bucket(qd->qd_hash);
1453 hlist_bl_del_rcu(&qd->qd_hlist);
1454 spin_unlock_bucket(qd->qd_hash);
1455
1456 gfs2_assert_warn(sdp, !qd->qd_change);
1457 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1458 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1459
1460 gfs2_glock_put(qd->qd_gl);
1461 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1462
1463 spin_lock(&qd_lock);
1464 }
1465 spin_unlock(&qd_lock);
1466
1467 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1468
1469 kvfree(sdp->sd_quota_bitmap);
1470 sdp->sd_quota_bitmap = NULL;
1471}
1472
1473static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1474{
1475 if (error == 0 || error == -EROFS)
1476 return;
1477 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1478 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1479}
1480
1481static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1482 int (*fxn)(struct super_block *sb, int type),
1483 unsigned long t, unsigned long *timeo,
1484 unsigned int *new_timeo)
1485{
1486 if (t >= *timeo) {
1487 int error = fxn(sdp->sd_vfs, 0);
1488 quotad_error(sdp, msg, error);
1489 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1490 } else {
1491 *timeo -= t;
1492 }
1493}
1494
1495static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1496{
1497 struct gfs2_inode *ip;
1498
1499 while(1) {
1500 ip = NULL;
1501 spin_lock(&sdp->sd_trunc_lock);
1502 if (!list_empty(&sdp->sd_trunc_list)) {
1503 ip = list_entry(sdp->sd_trunc_list.next,
1504 struct gfs2_inode, i_trunc_list);
1505 list_del_init(&ip->i_trunc_list);
1506 }
1507 spin_unlock(&sdp->sd_trunc_lock);
1508 if (ip == NULL)
1509 return;
1510 gfs2_glock_finish_truncate(ip);
1511 }
1512}
1513
1514void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1515 if (!sdp->sd_statfs_force_sync) {
1516 sdp->sd_statfs_force_sync = 1;
1517 wake_up(&sdp->sd_quota_wait);
1518 }
1519}
1520
1521
1522/**
1523 * gfs2_quotad - Write cached quota changes into the quota file
1524 * @sdp: Pointer to GFS2 superblock
1525 *
1526 */
1527
1528int gfs2_quotad(void *data)
1529{
1530 struct gfs2_sbd *sdp = data;
1531 struct gfs2_tune *tune = &sdp->sd_tune;
1532 unsigned long statfs_timeo = 0;
1533 unsigned long quotad_timeo = 0;
1534 unsigned long t = 0;
1535 DEFINE_WAIT(wait);
1536 int empty;
1537
1538 while (!kthread_should_stop()) {
1539
1540 /* Update the master statfs file */
1541 if (sdp->sd_statfs_force_sync) {
1542 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1543 quotad_error(sdp, "statfs", error);
1544 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1545 }
1546 else
1547 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1548 &statfs_timeo,
1549 &tune->gt_statfs_quantum);
1550
1551 /* Update quota file */
1552 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1553 "ad_timeo, &tune->gt_quota_quantum);
1554
1555 /* Check for & recover partially truncated inodes */
1556 quotad_check_trunc_list(sdp);
1557
1558 try_to_freeze();
1559
1560 t = min(quotad_timeo, statfs_timeo);
1561
1562 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1563 spin_lock(&sdp->sd_trunc_lock);
1564 empty = list_empty(&sdp->sd_trunc_list);
1565 spin_unlock(&sdp->sd_trunc_lock);
1566 if (empty && !sdp->sd_statfs_force_sync)
1567 t -= schedule_timeout(t);
1568 else
1569 t = 0;
1570 finish_wait(&sdp->sd_quota_wait, &wait);
1571 }
1572
1573 return 0;
1574}
1575
1576static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1577{
1578 struct gfs2_sbd *sdp = sb->s_fs_info;
1579
1580 memset(state, 0, sizeof(*state));
1581
1582 switch (sdp->sd_args.ar_quota) {
1583 case GFS2_QUOTA_ON:
1584 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1585 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1586 /*FALLTHRU*/
1587 case GFS2_QUOTA_ACCOUNT:
1588 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1589 QCI_SYSFILE;
1590 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1591 QCI_SYSFILE;
1592 break;
1593 case GFS2_QUOTA_OFF:
1594 break;
1595 }
1596 if (sdp->sd_quota_inode) {
1597 state->s_state[USRQUOTA].ino =
1598 GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1599 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1600 }
1601 state->s_state[USRQUOTA].nextents = 1; /* unsupported */
1602 state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1603 state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1604 return 0;
1605}
1606
1607static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1608 struct qc_dqblk *fdq)
1609{
1610 struct gfs2_sbd *sdp = sb->s_fs_info;
1611 struct gfs2_quota_lvb *qlvb;
1612 struct gfs2_quota_data *qd;
1613 struct gfs2_holder q_gh;
1614 int error;
1615
1616 memset(fdq, 0, sizeof(*fdq));
1617
1618 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1619 return -ESRCH; /* Crazy XFS error code */
1620
1621 if ((qid.type != USRQUOTA) &&
1622 (qid.type != GRPQUOTA))
1623 return -EINVAL;
1624
1625 error = qd_get(sdp, qid, &qd);
1626 if (error)
1627 return error;
1628 error = do_glock(qd, FORCE, &q_gh);
1629 if (error)
1630 goto out;
1631
1632 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1633 fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1634 fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1635 fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1636
1637 gfs2_glock_dq_uninit(&q_gh);
1638out:
1639 qd_put(qd);
1640 return error;
1641}
1642
1643/* GFS2 only supports a subset of the XFS fields */
1644#define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1645
1646static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1647 struct qc_dqblk *fdq)
1648{
1649 struct gfs2_sbd *sdp = sb->s_fs_info;
1650 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1651 struct gfs2_quota_data *qd;
1652 struct gfs2_holder q_gh, i_gh;
1653 unsigned int data_blocks, ind_blocks;
1654 unsigned int blocks = 0;
1655 int alloc_required;
1656 loff_t offset;
1657 int error;
1658
1659 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1660 return -ESRCH; /* Crazy XFS error code */
1661
1662 if ((qid.type != USRQUOTA) &&
1663 (qid.type != GRPQUOTA))
1664 return -EINVAL;
1665
1666 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1667 return -EINVAL;
1668
1669 error = qd_get(sdp, qid, &qd);
1670 if (error)
1671 return error;
1672
1673 error = gfs2_rsqa_alloc(ip);
1674 if (error)
1675 goto out_put;
1676
1677 inode_lock(&ip->i_inode);
1678 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1679 if (error)
1680 goto out_unlockput;
1681 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1682 if (error)
1683 goto out_q;
1684
1685 /* Check for existing entry, if none then alloc new blocks */
1686 error = update_qd(sdp, qd);
1687 if (error)
1688 goto out_i;
1689
1690 /* If nothing has changed, this is a no-op */
1691 if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1692 ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1693 fdq->d_fieldmask ^= QC_SPC_SOFT;
1694
1695 if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1696 ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1697 fdq->d_fieldmask ^= QC_SPC_HARD;
1698
1699 if ((fdq->d_fieldmask & QC_SPACE) &&
1700 ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1701 fdq->d_fieldmask ^= QC_SPACE;
1702
1703 if (fdq->d_fieldmask == 0)
1704 goto out_i;
1705
1706 offset = qd2offset(qd);
1707 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1708 if (gfs2_is_stuffed(ip))
1709 alloc_required = 1;
1710 if (alloc_required) {
1711 struct gfs2_alloc_parms ap = { .aflags = 0, };
1712 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1713 &data_blocks, &ind_blocks);
1714 blocks = 1 + data_blocks + ind_blocks;
1715 ap.target = blocks;
1716 error = gfs2_inplace_reserve(ip, &ap);
1717 if (error)
1718 goto out_i;
1719 blocks += gfs2_rg_blocks(ip, blocks);
1720 }
1721
1722 /* Some quotas span block boundaries and can update two blocks,
1723 adding an extra block to the transaction to handle such quotas */
1724 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1725 if (error)
1726 goto out_release;
1727
1728 /* Apply changes */
1729 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1730 if (!error)
1731 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1732
1733 gfs2_trans_end(sdp);
1734out_release:
1735 if (alloc_required)
1736 gfs2_inplace_release(ip);
1737out_i:
1738 gfs2_glock_dq_uninit(&i_gh);
1739out_q:
1740 gfs2_glock_dq_uninit(&q_gh);
1741out_unlockput:
1742 inode_unlock(&ip->i_inode);
1743out_put:
1744 qd_put(qd);
1745 return error;
1746}
1747
1748const struct quotactl_ops gfs2_quotactl_ops = {
1749 .quota_sync = gfs2_quota_sync,
1750 .get_state = gfs2_quota_get_state,
1751 .get_dqblk = gfs2_get_dqblk,
1752 .set_dqblk = gfs2_set_dqblk,
1753};
1754
1755void __init gfs2_quota_hash_init(void)
1756{
1757 unsigned i;
1758
1759 for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1760 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1761}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
5 */
6
7/*
8 * Quota change tags are associated with each transaction that allocates or
9 * deallocates space. Those changes are accumulated locally to each node (in a
10 * per-node file) and then are periodically synced to the quota file. This
11 * avoids the bottleneck of constantly touching the quota file, but introduces
12 * fuzziness in the current usage value of IDs that are being used on different
13 * nodes in the cluster simultaneously. So, it is possible for a user on
14 * multiple nodes to overrun their quota, but that overrun is controlable.
15 * Since quota tags are part of transactions, there is no need for a quota check
16 * program to be run on node crashes or anything like that.
17 *
18 * There are couple of knobs that let the administrator manage the quota
19 * fuzziness. "quota_quantum" sets the maximum time a quota change can be
20 * sitting on one node before being synced to the quota file. (The default is
21 * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency
22 * of quota file syncs increases as the user moves closer to their limit. The
23 * more frequent the syncs, the more accurate the quota enforcement, but that
24 * means that there is more contention between the nodes for the quota file.
25 * The default value is one. This sets the maximum theoretical quota overrun
26 * (with infinite node with infinite bandwidth) to twice the user's limit. (In
27 * practice, the maximum overrun you see should be much less.) A "quota_scale"
28 * number greater than one makes quota syncs more frequent and reduces the
29 * maximum overrun. Numbers less than one (but greater than zero) make quota
30 * syncs less frequent.
31 *
32 * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
33 * the quota file, so it is not being constantly read.
34 */
35
36#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
37
38#include <linux/sched.h>
39#include <linux/slab.h>
40#include <linux/mm.h>
41#include <linux/spinlock.h>
42#include <linux/completion.h>
43#include <linux/buffer_head.h>
44#include <linux/sort.h>
45#include <linux/fs.h>
46#include <linux/bio.h>
47#include <linux/gfs2_ondisk.h>
48#include <linux/kthread.h>
49#include <linux/freezer.h>
50#include <linux/quota.h>
51#include <linux/dqblk_xfs.h>
52#include <linux/lockref.h>
53#include <linux/list_lru.h>
54#include <linux/rcupdate.h>
55#include <linux/rculist_bl.h>
56#include <linux/bit_spinlock.h>
57#include <linux/jhash.h>
58#include <linux/vmalloc.h>
59
60#include "gfs2.h"
61#include "incore.h"
62#include "bmap.h"
63#include "glock.h"
64#include "glops.h"
65#include "log.h"
66#include "meta_io.h"
67#include "quota.h"
68#include "rgrp.h"
69#include "super.h"
70#include "trans.h"
71#include "inode.h"
72#include "util.h"
73
74#define GFS2_QD_HASH_SHIFT 12
75#define GFS2_QD_HASH_SIZE BIT(GFS2_QD_HASH_SHIFT)
76#define GFS2_QD_HASH_MASK (GFS2_QD_HASH_SIZE - 1)
77
78/* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */
79/* -> sd_bitmap_lock */
80static DEFINE_SPINLOCK(qd_lock);
81struct list_lru gfs2_qd_lru;
82
83static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
84
85static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
86 const struct kqid qid)
87{
88 unsigned int h;
89
90 h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
91 h = jhash(&qid, sizeof(struct kqid), h);
92
93 return h & GFS2_QD_HASH_MASK;
94}
95
96static inline void spin_lock_bucket(unsigned int hash)
97{
98 hlist_bl_lock(&qd_hash_table[hash]);
99}
100
101static inline void spin_unlock_bucket(unsigned int hash)
102{
103 hlist_bl_unlock(&qd_hash_table[hash]);
104}
105
106static void gfs2_qd_dealloc(struct rcu_head *rcu)
107{
108 struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
109 struct gfs2_sbd *sdp = qd->qd_sbd;
110
111 kmem_cache_free(gfs2_quotad_cachep, qd);
112 if (atomic_dec_and_test(&sdp->sd_quota_count))
113 wake_up(&sdp->sd_kill_wait);
114}
115
116static void gfs2_qd_dispose(struct gfs2_quota_data *qd)
117{
118 struct gfs2_sbd *sdp = qd->qd_sbd;
119
120 spin_lock(&qd_lock);
121 list_del(&qd->qd_list);
122 spin_unlock(&qd_lock);
123
124 spin_lock_bucket(qd->qd_hash);
125 hlist_bl_del_rcu(&qd->qd_hlist);
126 spin_unlock_bucket(qd->qd_hash);
127
128 if (!gfs2_withdrawing_or_withdrawn(sdp)) {
129 gfs2_assert_warn(sdp, !qd->qd_change);
130 gfs2_assert_warn(sdp, !qd->qd_slot_ref);
131 gfs2_assert_warn(sdp, !qd->qd_bh_count);
132 }
133
134 gfs2_glock_put(qd->qd_gl);
135 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
136}
137
138static void gfs2_qd_list_dispose(struct list_head *list)
139{
140 struct gfs2_quota_data *qd;
141
142 while (!list_empty(list)) {
143 qd = list_first_entry(list, struct gfs2_quota_data, qd_lru);
144 list_del(&qd->qd_lru);
145
146 gfs2_qd_dispose(qd);
147 }
148}
149
150
151static enum lru_status gfs2_qd_isolate(struct list_head *item,
152 struct list_lru_one *lru, void *arg)
153{
154 struct list_head *dispose = arg;
155 struct gfs2_quota_data *qd =
156 list_entry(item, struct gfs2_quota_data, qd_lru);
157 enum lru_status status;
158
159 if (!spin_trylock(&qd->qd_lockref.lock))
160 return LRU_SKIP;
161
162 status = LRU_SKIP;
163 if (qd->qd_lockref.count == 0) {
164 lockref_mark_dead(&qd->qd_lockref);
165 list_lru_isolate_move(lru, &qd->qd_lru, dispose);
166 status = LRU_REMOVED;
167 }
168
169 spin_unlock(&qd->qd_lockref.lock);
170 return status;
171}
172
173static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
174 struct shrink_control *sc)
175{
176 LIST_HEAD(dispose);
177 unsigned long freed;
178
179 if (!(sc->gfp_mask & __GFP_FS))
180 return SHRINK_STOP;
181
182 freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
183 gfs2_qd_isolate, &dispose);
184
185 gfs2_qd_list_dispose(&dispose);
186
187 return freed;
188}
189
190static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
191 struct shrink_control *sc)
192{
193 return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
194}
195
196static struct shrinker *gfs2_qd_shrinker;
197
198int __init gfs2_qd_shrinker_init(void)
199{
200 gfs2_qd_shrinker = shrinker_alloc(SHRINKER_NUMA_AWARE, "gfs2-qd");
201 if (!gfs2_qd_shrinker)
202 return -ENOMEM;
203
204 gfs2_qd_shrinker->count_objects = gfs2_qd_shrink_count;
205 gfs2_qd_shrinker->scan_objects = gfs2_qd_shrink_scan;
206
207 shrinker_register(gfs2_qd_shrinker);
208
209 return 0;
210}
211
212void gfs2_qd_shrinker_exit(void)
213{
214 shrinker_free(gfs2_qd_shrinker);
215}
216
217static u64 qd2index(struct gfs2_quota_data *qd)
218{
219 struct kqid qid = qd->qd_id;
220 return (2 * (u64)from_kqid(&init_user_ns, qid)) +
221 ((qid.type == USRQUOTA) ? 0 : 1);
222}
223
224static u64 qd2offset(struct gfs2_quota_data *qd)
225{
226 return qd2index(qd) * sizeof(struct gfs2_quota);
227}
228
229static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
230{
231 struct gfs2_quota_data *qd;
232 int error;
233
234 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
235 if (!qd)
236 return NULL;
237
238 qd->qd_sbd = sdp;
239 qd->qd_lockref.count = 0;
240 spin_lock_init(&qd->qd_lockref.lock);
241 qd->qd_id = qid;
242 qd->qd_slot = -1;
243 INIT_LIST_HEAD(&qd->qd_lru);
244 qd->qd_hash = hash;
245
246 error = gfs2_glock_get(sdp, qd2index(qd),
247 &gfs2_quota_glops, CREATE, &qd->qd_gl);
248 if (error)
249 goto fail;
250
251 return qd;
252
253fail:
254 kmem_cache_free(gfs2_quotad_cachep, qd);
255 return NULL;
256}
257
258static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
259 const struct gfs2_sbd *sdp,
260 struct kqid qid)
261{
262 struct gfs2_quota_data *qd;
263 struct hlist_bl_node *h;
264
265 hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
266 if (!qid_eq(qd->qd_id, qid))
267 continue;
268 if (qd->qd_sbd != sdp)
269 continue;
270 if (lockref_get_not_dead(&qd->qd_lockref)) {
271 list_lru_del_obj(&gfs2_qd_lru, &qd->qd_lru);
272 return qd;
273 }
274 }
275
276 return NULL;
277}
278
279
280static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
281 struct gfs2_quota_data **qdp)
282{
283 struct gfs2_quota_data *qd, *new_qd;
284 unsigned int hash = gfs2_qd_hash(sdp, qid);
285
286 rcu_read_lock();
287 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
288 rcu_read_unlock();
289
290 if (qd)
291 return 0;
292
293 new_qd = qd_alloc(hash, sdp, qid);
294 if (!new_qd)
295 return -ENOMEM;
296
297 spin_lock(&qd_lock);
298 spin_lock_bucket(hash);
299 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
300 if (qd == NULL) {
301 new_qd->qd_lockref.count++;
302 *qdp = new_qd;
303 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
304 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
305 atomic_inc(&sdp->sd_quota_count);
306 }
307 spin_unlock_bucket(hash);
308 spin_unlock(&qd_lock);
309
310 if (qd) {
311 gfs2_glock_put(new_qd->qd_gl);
312 kmem_cache_free(gfs2_quotad_cachep, new_qd);
313 }
314
315 return 0;
316}
317
318
319static void __qd_hold(struct gfs2_quota_data *qd)
320{
321 struct gfs2_sbd *sdp = qd->qd_sbd;
322 gfs2_assert(sdp, qd->qd_lockref.count > 0);
323 qd->qd_lockref.count++;
324}
325
326static void qd_put(struct gfs2_quota_data *qd)
327{
328 struct gfs2_sbd *sdp;
329
330 if (lockref_put_or_lock(&qd->qd_lockref))
331 return;
332
333 BUG_ON(__lockref_is_dead(&qd->qd_lockref));
334 sdp = qd->qd_sbd;
335 if (unlikely(!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))) {
336 lockref_mark_dead(&qd->qd_lockref);
337 spin_unlock(&qd->qd_lockref.lock);
338
339 gfs2_qd_dispose(qd);
340 return;
341 }
342
343 qd->qd_lockref.count = 0;
344 list_lru_add_obj(&gfs2_qd_lru, &qd->qd_lru);
345 spin_unlock(&qd->qd_lockref.lock);
346}
347
348static int slot_get(struct gfs2_quota_data *qd)
349{
350 struct gfs2_sbd *sdp = qd->qd_sbd;
351 unsigned int bit;
352 int error = 0;
353
354 spin_lock(&sdp->sd_bitmap_lock);
355 if (qd->qd_slot_ref == 0) {
356 bit = find_first_zero_bit(sdp->sd_quota_bitmap,
357 sdp->sd_quota_slots);
358 if (bit >= sdp->sd_quota_slots) {
359 error = -ENOSPC;
360 goto out;
361 }
362 set_bit(bit, sdp->sd_quota_bitmap);
363 qd->qd_slot = bit;
364 }
365 qd->qd_slot_ref++;
366out:
367 spin_unlock(&sdp->sd_bitmap_lock);
368 return error;
369}
370
371static void slot_hold(struct gfs2_quota_data *qd)
372{
373 struct gfs2_sbd *sdp = qd->qd_sbd;
374
375 spin_lock(&sdp->sd_bitmap_lock);
376 gfs2_assert(sdp, qd->qd_slot_ref);
377 qd->qd_slot_ref++;
378 spin_unlock(&sdp->sd_bitmap_lock);
379}
380
381static void slot_put(struct gfs2_quota_data *qd)
382{
383 struct gfs2_sbd *sdp = qd->qd_sbd;
384
385 spin_lock(&sdp->sd_bitmap_lock);
386 gfs2_assert(sdp, qd->qd_slot_ref);
387 if (!--qd->qd_slot_ref) {
388 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
389 qd->qd_slot = -1;
390 }
391 spin_unlock(&sdp->sd_bitmap_lock);
392}
393
394static int bh_get(struct gfs2_quota_data *qd)
395{
396 struct gfs2_sbd *sdp = qd->qd_sbd;
397 struct inode *inode = sdp->sd_qc_inode;
398 struct gfs2_inode *ip = GFS2_I(inode);
399 unsigned int block, offset;
400 struct buffer_head *bh = NULL;
401 struct iomap iomap = { };
402 int error;
403
404 spin_lock(&qd->qd_lockref.lock);
405 if (qd->qd_bh_count) {
406 qd->qd_bh_count++;
407 spin_unlock(&qd->qd_lockref.lock);
408 return 0;
409 }
410 spin_unlock(&qd->qd_lockref.lock);
411
412 block = qd->qd_slot / sdp->sd_qc_per_block;
413 offset = qd->qd_slot % sdp->sd_qc_per_block;
414
415 error = gfs2_iomap_get(inode,
416 (loff_t)block << inode->i_blkbits,
417 i_blocksize(inode), &iomap);
418 if (error)
419 return error;
420 error = -ENOENT;
421 if (iomap.type != IOMAP_MAPPED)
422 return error;
423
424 error = gfs2_meta_read(ip->i_gl, iomap.addr >> inode->i_blkbits,
425 DIO_WAIT, 0, &bh);
426 if (error)
427 return error;
428 error = -EIO;
429 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
430 goto out;
431
432 spin_lock(&qd->qd_lockref.lock);
433 if (qd->qd_bh == NULL) {
434 qd->qd_bh = bh;
435 qd->qd_bh_qc = (struct gfs2_quota_change *)
436 (bh->b_data + sizeof(struct gfs2_meta_header) +
437 offset * sizeof(struct gfs2_quota_change));
438 bh = NULL;
439 }
440 qd->qd_bh_count++;
441 spin_unlock(&qd->qd_lockref.lock);
442 error = 0;
443
444out:
445 brelse(bh);
446 return error;
447}
448
449static void bh_put(struct gfs2_quota_data *qd)
450{
451 struct gfs2_sbd *sdp = qd->qd_sbd;
452 struct buffer_head *bh = NULL;
453
454 spin_lock(&qd->qd_lockref.lock);
455 gfs2_assert(sdp, qd->qd_bh_count);
456 if (!--qd->qd_bh_count) {
457 bh = qd->qd_bh;
458 qd->qd_bh = NULL;
459 qd->qd_bh_qc = NULL;
460 }
461 spin_unlock(&qd->qd_lockref.lock);
462 brelse(bh);
463}
464
465static bool qd_grab_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
466 u64 sync_gen)
467{
468 bool ret = false;
469
470 spin_lock(&qd->qd_lockref.lock);
471 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
472 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
473 qd->qd_sync_gen >= sync_gen)
474 goto out;
475
476 if (__lockref_is_dead(&qd->qd_lockref))
477 goto out;
478 qd->qd_lockref.count++;
479
480 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
481 set_bit(QDF_LOCKED, &qd->qd_flags);
482 qd->qd_change_sync = qd->qd_change;
483 slot_hold(qd);
484 ret = true;
485
486out:
487 spin_unlock(&qd->qd_lockref.lock);
488 return ret;
489}
490
491static void qd_ungrab_sync(struct gfs2_quota_data *qd)
492{
493 clear_bit(QDF_LOCKED, &qd->qd_flags);
494 slot_put(qd);
495 qd_put(qd);
496}
497
498static void qdsb_put(struct gfs2_quota_data *qd)
499{
500 bh_put(qd);
501 slot_put(qd);
502 qd_put(qd);
503}
504
505static void qd_unlock(struct gfs2_quota_data *qd)
506{
507 spin_lock(&qd->qd_lockref.lock);
508 gfs2_assert_warn(qd->qd_sbd, test_bit(QDF_LOCKED, &qd->qd_flags));
509 clear_bit(QDF_LOCKED, &qd->qd_flags);
510 spin_unlock(&qd->qd_lockref.lock);
511 qdsb_put(qd);
512}
513
514static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
515 struct gfs2_quota_data **qdp)
516{
517 int error;
518
519 error = qd_get(sdp, qid, qdp);
520 if (error)
521 return error;
522
523 error = slot_get(*qdp);
524 if (error)
525 goto fail;
526
527 error = bh_get(*qdp);
528 if (error)
529 goto fail_slot;
530
531 return 0;
532
533fail_slot:
534 slot_put(*qdp);
535fail:
536 qd_put(*qdp);
537 return error;
538}
539
540/**
541 * gfs2_qa_get - make sure we have a quota allocations data structure,
542 * if necessary
543 * @ip: the inode for this reservation
544 */
545int gfs2_qa_get(struct gfs2_inode *ip)
546{
547 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
548 struct inode *inode = &ip->i_inode;
549
550 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
551 return 0;
552
553 spin_lock(&inode->i_lock);
554 if (ip->i_qadata == NULL) {
555 struct gfs2_qadata *tmp;
556
557 spin_unlock(&inode->i_lock);
558 tmp = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
559 if (!tmp)
560 return -ENOMEM;
561
562 spin_lock(&inode->i_lock);
563 if (ip->i_qadata == NULL)
564 ip->i_qadata = tmp;
565 else
566 kmem_cache_free(gfs2_qadata_cachep, tmp);
567 }
568 ip->i_qadata->qa_ref++;
569 spin_unlock(&inode->i_lock);
570 return 0;
571}
572
573void gfs2_qa_put(struct gfs2_inode *ip)
574{
575 struct inode *inode = &ip->i_inode;
576
577 spin_lock(&inode->i_lock);
578 if (ip->i_qadata && --ip->i_qadata->qa_ref == 0) {
579 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
580 ip->i_qadata = NULL;
581 }
582 spin_unlock(&inode->i_lock);
583}
584
585int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
586{
587 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
588 struct gfs2_quota_data **qd;
589 int error;
590
591 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
592 return 0;
593
594 error = gfs2_qa_get(ip);
595 if (error)
596 return error;
597
598 qd = ip->i_qadata->qa_qd;
599
600 if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
601 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) {
602 error = -EIO;
603 gfs2_qa_put(ip);
604 goto out;
605 }
606
607 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
608 if (error)
609 goto out_unhold;
610 ip->i_qadata->qa_qd_num++;
611 qd++;
612
613 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
614 if (error)
615 goto out_unhold;
616 ip->i_qadata->qa_qd_num++;
617 qd++;
618
619 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
620 !uid_eq(uid, ip->i_inode.i_uid)) {
621 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
622 if (error)
623 goto out_unhold;
624 ip->i_qadata->qa_qd_num++;
625 qd++;
626 }
627
628 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
629 !gid_eq(gid, ip->i_inode.i_gid)) {
630 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
631 if (error)
632 goto out_unhold;
633 ip->i_qadata->qa_qd_num++;
634 qd++;
635 }
636
637out_unhold:
638 if (error)
639 gfs2_quota_unhold(ip);
640out:
641 return error;
642}
643
644void gfs2_quota_unhold(struct gfs2_inode *ip)
645{
646 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
647 u32 x;
648
649 if (ip->i_qadata == NULL)
650 return;
651
652 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
653
654 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
655 qdsb_put(ip->i_qadata->qa_qd[x]);
656 ip->i_qadata->qa_qd[x] = NULL;
657 }
658 ip->i_qadata->qa_qd_num = 0;
659 gfs2_qa_put(ip);
660}
661
662static int sort_qd(const void *a, const void *b)
663{
664 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
665 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
666
667 if (qid_lt(qd_a->qd_id, qd_b->qd_id))
668 return -1;
669 if (qid_lt(qd_b->qd_id, qd_a->qd_id))
670 return 1;
671 return 0;
672}
673
674static void do_qc(struct gfs2_quota_data *qd, s64 change)
675{
676 struct gfs2_sbd *sdp = qd->qd_sbd;
677 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
678 struct gfs2_quota_change *qc = qd->qd_bh_qc;
679 bool needs_put = false;
680 s64 x;
681
682 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
683
684 /*
685 * The QDF_CHANGE flag indicates that the slot in the quota change file
686 * is used. Here, we use the value of qc->qc_change when the slot is
687 * used, and we assume a value of 0 otherwise.
688 */
689
690 spin_lock(&qd->qd_lockref.lock);
691
692 x = 0;
693 if (test_bit(QDF_CHANGE, &qd->qd_flags))
694 x = be64_to_cpu(qc->qc_change);
695 x += change;
696 qd->qd_change += change;
697
698 if (!x && test_bit(QDF_CHANGE, &qd->qd_flags)) {
699 /* The slot in the quota change file becomes unused. */
700 clear_bit(QDF_CHANGE, &qd->qd_flags);
701 qc->qc_flags = 0;
702 qc->qc_id = 0;
703 needs_put = true;
704 } else if (x && !test_bit(QDF_CHANGE, &qd->qd_flags)) {
705 /* The slot in the quota change file becomes used. */
706 set_bit(QDF_CHANGE, &qd->qd_flags);
707 __qd_hold(qd);
708 slot_hold(qd);
709
710 qc->qc_flags = 0;
711 if (qd->qd_id.type == USRQUOTA)
712 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
713 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
714 }
715 qc->qc_change = cpu_to_be64(x);
716
717 spin_unlock(&qd->qd_lockref.lock);
718
719 if (needs_put) {
720 slot_put(qd);
721 qd_put(qd);
722 }
723 if (change < 0) /* Reset quiet flag if we freed some blocks */
724 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
725}
726
727static int gfs2_write_buf_to_page(struct gfs2_sbd *sdp, unsigned long index,
728 unsigned off, void *buf, unsigned bytes)
729{
730 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
731 struct inode *inode = &ip->i_inode;
732 struct address_space *mapping = inode->i_mapping;
733 struct folio *folio;
734 struct buffer_head *bh;
735 u64 blk;
736 unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
737 unsigned to_write = bytes, pg_off = off;
738
739 blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
740 boff = off % bsize;
741
742 folio = filemap_grab_folio(mapping, index);
743 if (IS_ERR(folio))
744 return PTR_ERR(folio);
745 bh = folio_buffers(folio);
746 if (!bh)
747 bh = create_empty_buffers(folio, bsize, 0);
748
749 for (;;) {
750 /* Find the beginning block within the folio */
751 if (pg_off >= ((bnum * bsize) + bsize)) {
752 bh = bh->b_this_page;
753 bnum++;
754 blk++;
755 continue;
756 }
757 if (!buffer_mapped(bh)) {
758 gfs2_block_map(inode, blk, bh, 1);
759 if (!buffer_mapped(bh))
760 goto unlock_out;
761 /* If it's a newly allocated disk block, zero it */
762 if (buffer_new(bh))
763 folio_zero_range(folio, bnum * bsize,
764 bh->b_size);
765 }
766 if (folio_test_uptodate(folio))
767 set_buffer_uptodate(bh);
768 if (bh_read(bh, REQ_META | REQ_PRIO) < 0)
769 goto unlock_out;
770 gfs2_trans_add_data(ip->i_gl, bh);
771
772 /* If we need to write to the next block as well */
773 if (to_write > (bsize - boff)) {
774 pg_off += (bsize - boff);
775 to_write -= (bsize - boff);
776 boff = pg_off % bsize;
777 continue;
778 }
779 break;
780 }
781
782 /* Write to the folio, now that we have setup the buffer(s) */
783 memcpy_to_folio(folio, off, buf, bytes);
784 flush_dcache_folio(folio);
785 folio_unlock(folio);
786 folio_put(folio);
787
788 return 0;
789
790unlock_out:
791 folio_unlock(folio);
792 folio_put(folio);
793 return -EIO;
794}
795
796static int gfs2_write_disk_quota(struct gfs2_sbd *sdp, struct gfs2_quota *qp,
797 loff_t loc)
798{
799 unsigned long pg_beg;
800 unsigned pg_off, nbytes, overflow = 0;
801 int error;
802 void *ptr;
803
804 nbytes = sizeof(struct gfs2_quota);
805
806 pg_beg = loc >> PAGE_SHIFT;
807 pg_off = offset_in_page(loc);
808
809 /* If the quota straddles a page boundary, split the write in two */
810 if ((pg_off + nbytes) > PAGE_SIZE)
811 overflow = (pg_off + nbytes) - PAGE_SIZE;
812
813 ptr = qp;
814 error = gfs2_write_buf_to_page(sdp, pg_beg, pg_off, ptr,
815 nbytes - overflow);
816 /* If there's an overflow, write the remaining bytes to the next page */
817 if (!error && overflow)
818 error = gfs2_write_buf_to_page(sdp, pg_beg + 1, 0,
819 ptr + nbytes - overflow,
820 overflow);
821 return error;
822}
823
824/**
825 * gfs2_adjust_quota - adjust record of current block usage
826 * @sdp: The superblock
827 * @loc: Offset of the entry in the quota file
828 * @change: The amount of usage change to record
829 * @qd: The quota data
830 * @fdq: The updated limits to record
831 *
832 * This function was mostly borrowed from gfs2_block_truncate_page which was
833 * in turn mostly borrowed from ext3
834 *
835 * Returns: 0 or -ve on error
836 */
837
838static int gfs2_adjust_quota(struct gfs2_sbd *sdp, loff_t loc,
839 s64 change, struct gfs2_quota_data *qd,
840 struct qc_dqblk *fdq)
841{
842 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
843 struct inode *inode = &ip->i_inode;
844 struct gfs2_quota q;
845 int err;
846 u64 size;
847
848 if (gfs2_is_stuffed(ip)) {
849 err = gfs2_unstuff_dinode(ip);
850 if (err)
851 return err;
852 }
853
854 memset(&q, 0, sizeof(struct gfs2_quota));
855 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
856 if (err < 0)
857 return err;
858
859 loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
860 be64_add_cpu(&q.qu_value, change);
861 if (((s64)be64_to_cpu(q.qu_value)) < 0)
862 q.qu_value = 0; /* Never go negative on quota usage */
863 spin_lock(&qd->qd_lockref.lock);
864 qd->qd_qb.qb_value = q.qu_value;
865 if (fdq) {
866 if (fdq->d_fieldmask & QC_SPC_SOFT) {
867 q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
868 qd->qd_qb.qb_warn = q.qu_warn;
869 }
870 if (fdq->d_fieldmask & QC_SPC_HARD) {
871 q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
872 qd->qd_qb.qb_limit = q.qu_limit;
873 }
874 if (fdq->d_fieldmask & QC_SPACE) {
875 q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
876 qd->qd_qb.qb_value = q.qu_value;
877 }
878 }
879 spin_unlock(&qd->qd_lockref.lock);
880
881 err = gfs2_write_disk_quota(sdp, &q, loc);
882 if (!err) {
883 size = loc + sizeof(struct gfs2_quota);
884 if (size > inode->i_size)
885 i_size_write(inode, size);
886 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
887 mark_inode_dirty(inode);
888 set_bit(QDF_REFRESH, &qd->qd_flags);
889 }
890
891 return err;
892}
893
894static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda,
895 u64 sync_gen)
896{
897 struct gfs2_sbd *sdp = (*qda)->qd_sbd;
898 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
899 struct gfs2_alloc_parms ap = {};
900 unsigned int data_blocks, ind_blocks;
901 struct gfs2_holder *ghs, i_gh;
902 unsigned int qx, x;
903 struct gfs2_quota_data *qd;
904 unsigned reserved;
905 loff_t offset;
906 unsigned int nalloc = 0, blocks;
907 int error;
908
909 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
910 &data_blocks, &ind_blocks);
911
912 ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
913 if (!ghs)
914 return -ENOMEM;
915
916 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
917 inode_lock(&ip->i_inode);
918 for (qx = 0; qx < num_qd; qx++) {
919 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
920 GL_NOCACHE, &ghs[qx]);
921 if (error)
922 goto out_dq;
923 }
924
925 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
926 if (error)
927 goto out_dq;
928
929 for (x = 0; x < num_qd; x++) {
930 offset = qd2offset(qda[x]);
931 if (gfs2_write_alloc_required(ip, offset,
932 sizeof(struct gfs2_quota)))
933 nalloc++;
934 }
935
936 /*
937 * 1 blk for unstuffing inode if stuffed. We add this extra
938 * block to the reservation unconditionally. If the inode
939 * doesn't need unstuffing, the block will be released to the
940 * rgrp since it won't be allocated during the transaction
941 */
942 /* +3 in the end for unstuffing block, inode size update block
943 * and another block in case quota straddles page boundary and
944 * two blocks need to be updated instead of 1 */
945 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
946
947 reserved = 1 + (nalloc * (data_blocks + ind_blocks));
948 ap.target = reserved;
949 error = gfs2_inplace_reserve(ip, &ap);
950 if (error)
951 goto out_alloc;
952
953 if (nalloc)
954 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
955
956 error = gfs2_trans_begin(sdp, blocks, 0);
957 if (error)
958 goto out_ipres;
959
960 for (x = 0; x < num_qd; x++) {
961 qd = qda[x];
962 offset = qd2offset(qd);
963 error = gfs2_adjust_quota(sdp, offset, qd->qd_change_sync, qd,
964 NULL);
965 if (error)
966 goto out_end_trans;
967
968 do_qc(qd, -qd->qd_change_sync);
969 set_bit(QDF_REFRESH, &qd->qd_flags);
970 }
971
972out_end_trans:
973 gfs2_trans_end(sdp);
974out_ipres:
975 gfs2_inplace_release(ip);
976out_alloc:
977 gfs2_glock_dq_uninit(&i_gh);
978out_dq:
979 while (qx--)
980 gfs2_glock_dq_uninit(&ghs[qx]);
981 inode_unlock(&ip->i_inode);
982 kfree(ghs);
983 gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl,
984 GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
985 if (!error) {
986 for (x = 0; x < num_qd; x++) {
987 qd = qda[x];
988 spin_lock(&qd->qd_lockref.lock);
989 if (qd->qd_sync_gen < sync_gen)
990 qd->qd_sync_gen = sync_gen;
991 spin_unlock(&qd->qd_lockref.lock);
992 }
993 }
994 return error;
995}
996
997static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
998{
999 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1000 struct gfs2_quota q;
1001 struct gfs2_quota_lvb *qlvb;
1002 loff_t pos;
1003 int error;
1004
1005 memset(&q, 0, sizeof(struct gfs2_quota));
1006 pos = qd2offset(qd);
1007 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
1008 if (error < 0)
1009 return error;
1010
1011 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1012 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
1013 qlvb->__pad = 0;
1014 qlvb->qb_limit = q.qu_limit;
1015 qlvb->qb_warn = q.qu_warn;
1016 qlvb->qb_value = q.qu_value;
1017 spin_lock(&qd->qd_lockref.lock);
1018 qd->qd_qb = *qlvb;
1019 spin_unlock(&qd->qd_lockref.lock);
1020
1021 return 0;
1022}
1023
1024static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
1025 struct gfs2_holder *q_gh)
1026{
1027 struct gfs2_sbd *sdp = qd->qd_sbd;
1028 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1029 struct gfs2_holder i_gh;
1030 int error;
1031
1032 gfs2_assert_warn(sdp, sdp == qd->qd_gl->gl_name.ln_sbd);
1033restart:
1034 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
1035 if (error)
1036 return error;
1037
1038 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1039 force_refresh = FORCE;
1040
1041 spin_lock(&qd->qd_lockref.lock);
1042 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1043 spin_unlock(&qd->qd_lockref.lock);
1044
1045 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1046 gfs2_glock_dq_uninit(q_gh);
1047 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1048 GL_NOCACHE, q_gh);
1049 if (error)
1050 return error;
1051
1052 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1053 if (error)
1054 goto fail;
1055
1056 error = update_qd(sdp, qd);
1057 if (error)
1058 goto fail_gunlock;
1059
1060 gfs2_glock_dq_uninit(&i_gh);
1061 gfs2_glock_dq_uninit(q_gh);
1062 force_refresh = 0;
1063 goto restart;
1064 }
1065
1066 return 0;
1067
1068fail_gunlock:
1069 gfs2_glock_dq_uninit(&i_gh);
1070fail:
1071 gfs2_glock_dq_uninit(q_gh);
1072 return error;
1073}
1074
1075int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1076{
1077 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1078 struct gfs2_quota_data *qd;
1079 u32 x;
1080 int error;
1081
1082 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1083 return 0;
1084
1085 error = gfs2_quota_hold(ip, uid, gid);
1086 if (error)
1087 return error;
1088
1089 sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1090 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1091
1092 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1093 qd = ip->i_qadata->qa_qd[x];
1094 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1095 if (error)
1096 break;
1097 }
1098
1099 if (!error)
1100 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1101 else {
1102 while (x--)
1103 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1104 gfs2_quota_unhold(ip);
1105 }
1106
1107 return error;
1108}
1109
1110static bool need_sync(struct gfs2_quota_data *qd)
1111{
1112 struct gfs2_sbd *sdp = qd->qd_sbd;
1113 struct gfs2_tune *gt = &sdp->sd_tune;
1114 s64 value, change, limit;
1115 unsigned int num, den;
1116 int ret = false;
1117
1118 spin_lock(&qd->qd_lockref.lock);
1119 if (!qd->qd_qb.qb_limit)
1120 goto out;
1121
1122 change = qd->qd_change;
1123 if (change <= 0)
1124 goto out;
1125 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1126 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1127 if (value >= limit)
1128 goto out;
1129
1130 spin_lock(>->gt_spin);
1131 num = gt->gt_quota_scale_num;
1132 den = gt->gt_quota_scale_den;
1133 spin_unlock(>->gt_spin);
1134
1135 change *= gfs2_jindex_size(sdp) * num;
1136 change = div_s64(change, den);
1137 if (value + change < limit)
1138 goto out;
1139
1140 ret = true;
1141out:
1142 spin_unlock(&qd->qd_lockref.lock);
1143 return ret;
1144}
1145
1146void gfs2_quota_unlock(struct gfs2_inode *ip)
1147{
1148 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1149 struct gfs2_quota_data *qda[2 * GFS2_MAXQUOTAS];
1150 unsigned int count = 0;
1151 u32 x;
1152
1153 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1154 return;
1155
1156 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1157 struct gfs2_quota_data *qd;
1158 bool sync;
1159 int error;
1160
1161 qd = ip->i_qadata->qa_qd[x];
1162 sync = need_sync(qd);
1163
1164 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1165 if (!sync)
1166 continue;
1167
1168 spin_lock(&qd_lock);
1169 sync = qd_grab_sync(sdp, qd, U64_MAX);
1170 spin_unlock(&qd_lock);
1171
1172 if (!sync)
1173 continue;
1174
1175 gfs2_assert_warn(sdp, qd->qd_change_sync);
1176 error = bh_get(qd);
1177 if (error) {
1178 qd_ungrab_sync(qd);
1179 continue;
1180 }
1181
1182 qda[count++] = qd;
1183 }
1184
1185 if (count) {
1186 u64 sync_gen = READ_ONCE(sdp->sd_quota_sync_gen);
1187
1188 do_sync(count, qda, sync_gen);
1189 for (x = 0; x < count; x++)
1190 qd_unlock(qda[x]);
1191 }
1192
1193 gfs2_quota_unhold(ip);
1194}
1195
1196#define MAX_LINE 256
1197
1198static void print_message(struct gfs2_quota_data *qd, char *type)
1199{
1200 struct gfs2_sbd *sdp = qd->qd_sbd;
1201
1202 if (sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET) {
1203 fs_info(sdp, "quota %s for %s %u\n",
1204 type,
1205 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1206 from_kqid(&init_user_ns, qd->qd_id));
1207 }
1208}
1209
1210/**
1211 * gfs2_quota_check - check if allocating new blocks will exceed quota
1212 * @ip: The inode for which this check is being performed
1213 * @uid: The uid to check against
1214 * @gid: The gid to check against
1215 * @ap: The allocation parameters. ap->target contains the requested
1216 * blocks. ap->min_target, if set, contains the minimum blks
1217 * requested.
1218 *
1219 * Returns: 0 on success.
1220 * min_req = ap->min_target ? ap->min_target : ap->target;
1221 * quota must allow at least min_req blks for success and
1222 * ap->allowed is set to the number of blocks allowed
1223 *
1224 * -EDQUOT otherwise, quota violation. ap->allowed is set to number
1225 * of blocks available.
1226 */
1227int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1228 struct gfs2_alloc_parms *ap)
1229{
1230 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1231 struct gfs2_quota_data *qd;
1232 s64 value, warn, limit;
1233 u32 x;
1234 int error = 0;
1235
1236 ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1237 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1238 return 0;
1239
1240 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1241 qd = ip->i_qadata->qa_qd[x];
1242
1243 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1244 qid_eq(qd->qd_id, make_kqid_gid(gid))))
1245 continue;
1246
1247 spin_lock(&qd->qd_lockref.lock);
1248 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1249 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1250 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1251 value += qd->qd_change;
1252 spin_unlock(&qd->qd_lockref.lock);
1253
1254 if (limit > 0 && (limit - value) < ap->allowed)
1255 ap->allowed = limit - value;
1256 /* If we can't meet the target */
1257 if (limit && limit < (value + (s64)ap->target)) {
1258 /* If no min_target specified or we don't meet
1259 * min_target, return -EDQUOT */
1260 if (!ap->min_target || ap->min_target > ap->allowed) {
1261 if (!test_and_set_bit(QDF_QMSG_QUIET,
1262 &qd->qd_flags)) {
1263 print_message(qd, "exceeded");
1264 quota_send_warning(qd->qd_id,
1265 sdp->sd_vfs->s_dev,
1266 QUOTA_NL_BHARDWARN);
1267 }
1268 error = -EDQUOT;
1269 break;
1270 }
1271 } else if (warn && warn < value &&
1272 time_after_eq(jiffies, qd->qd_last_warn +
1273 gfs2_tune_get(sdp, gt_quota_warn_period)
1274 * HZ)) {
1275 quota_send_warning(qd->qd_id,
1276 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1277 print_message(qd, "warning");
1278 error = 0;
1279 qd->qd_last_warn = jiffies;
1280 }
1281 }
1282 return error;
1283}
1284
1285void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1286 kuid_t uid, kgid_t gid)
1287{
1288 struct gfs2_quota_data *qd;
1289 u32 x;
1290 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1291
1292 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF ||
1293 gfs2_assert_warn(sdp, change))
1294 return;
1295 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1296 return;
1297
1298 if (gfs2_assert_withdraw(sdp, ip->i_qadata &&
1299 ip->i_qadata->qa_ref > 0))
1300 return;
1301 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1302 qd = ip->i_qadata->qa_qd[x];
1303
1304 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1305 qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1306 do_qc(qd, change);
1307 }
1308 }
1309}
1310
1311int gfs2_quota_sync(struct super_block *sb, int type)
1312{
1313 struct gfs2_sbd *sdp = sb->s_fs_info;
1314 struct gfs2_quota_data **qda;
1315 unsigned int max_qd = PAGE_SIZE / sizeof(struct gfs2_holder);
1316 u64 sync_gen;
1317 int error = 0;
1318
1319 if (sb_rdonly(sdp->sd_vfs))
1320 return 0;
1321
1322 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1323 if (!qda)
1324 return -ENOMEM;
1325
1326 mutex_lock(&sdp->sd_quota_sync_mutex);
1327 sync_gen = sdp->sd_quota_sync_gen + 1;
1328
1329 do {
1330 struct gfs2_quota_data *iter;
1331 unsigned int num_qd = 0;
1332 unsigned int x;
1333
1334 spin_lock(&qd_lock);
1335 list_for_each_entry(iter, &sdp->sd_quota_list, qd_list) {
1336 if (qd_grab_sync(sdp, iter, sync_gen)) {
1337 qda[num_qd++] = iter;
1338 if (num_qd == max_qd)
1339 break;
1340 }
1341 }
1342 spin_unlock(&qd_lock);
1343
1344 if (!num_qd)
1345 break;
1346
1347 for (x = 0; x < num_qd; x++) {
1348 error = bh_get(qda[x]);
1349 if (!error)
1350 continue;
1351
1352 while (x < num_qd)
1353 qd_ungrab_sync(qda[--num_qd]);
1354 break;
1355 }
1356
1357 if (!error) {
1358 WRITE_ONCE(sdp->sd_quota_sync_gen, sync_gen);
1359 error = do_sync(num_qd, qda, sync_gen);
1360 }
1361
1362 for (x = 0; x < num_qd; x++)
1363 qd_unlock(qda[x]);
1364 } while (!error);
1365
1366 mutex_unlock(&sdp->sd_quota_sync_mutex);
1367 kfree(qda);
1368
1369 return error;
1370}
1371
1372int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1373{
1374 struct gfs2_quota_data *qd;
1375 struct gfs2_holder q_gh;
1376 int error;
1377
1378 error = qd_get(sdp, qid, &qd);
1379 if (error)
1380 return error;
1381
1382 error = do_glock(qd, FORCE, &q_gh);
1383 if (!error)
1384 gfs2_glock_dq_uninit(&q_gh);
1385
1386 qd_put(qd);
1387 return error;
1388}
1389
1390int gfs2_quota_init(struct gfs2_sbd *sdp)
1391{
1392 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1393 u64 size = i_size_read(sdp->sd_qc_inode);
1394 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1395 unsigned int x, slot = 0;
1396 unsigned int found = 0;
1397 unsigned int hash;
1398 unsigned int bm_size;
1399 struct buffer_head *bh;
1400 u64 dblock;
1401 u32 extlen = 0;
1402 int error;
1403
1404 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1405 return -EIO;
1406
1407 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1408 bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1409 bm_size *= sizeof(unsigned long);
1410 error = -ENOMEM;
1411 sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1412 if (sdp->sd_quota_bitmap == NULL)
1413 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1414 __GFP_ZERO);
1415 if (!sdp->sd_quota_bitmap)
1416 return error;
1417
1418 for (x = 0; x < blocks; x++) {
1419 struct gfs2_quota_change *qc;
1420 unsigned int y;
1421
1422 if (!extlen) {
1423 extlen = 32;
1424 error = gfs2_get_extent(&ip->i_inode, x, &dblock, &extlen);
1425 if (error)
1426 goto fail;
1427 }
1428 error = -EIO;
1429 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1430 if (!bh)
1431 goto fail;
1432 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
1433 goto fail_brelse;
1434
1435 qc = (struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1436 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1437 y++, slot++) {
1438 struct gfs2_quota_data *old_qd, *qd;
1439 s64 qc_change = be64_to_cpu(qc->qc_change);
1440 u32 qc_flags = be32_to_cpu(qc->qc_flags);
1441 enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1442 USRQUOTA : GRPQUOTA;
1443 struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1444 be32_to_cpu(qc->qc_id));
1445 qc++;
1446 if (!qc_change)
1447 continue;
1448
1449 hash = gfs2_qd_hash(sdp, qc_id);
1450 qd = qd_alloc(hash, sdp, qc_id);
1451 if (qd == NULL)
1452 goto fail_brelse;
1453
1454 set_bit(QDF_CHANGE, &qd->qd_flags);
1455 qd->qd_change = qc_change;
1456 qd->qd_slot = slot;
1457 qd->qd_slot_ref = 1;
1458
1459 spin_lock(&qd_lock);
1460 spin_lock_bucket(hash);
1461 old_qd = gfs2_qd_search_bucket(hash, sdp, qc_id);
1462 if (old_qd) {
1463 fs_err(sdp, "Corruption found in quota_change%u"
1464 "file: duplicate identifier in "
1465 "slot %u\n",
1466 sdp->sd_jdesc->jd_jid, slot);
1467
1468 spin_unlock_bucket(hash);
1469 spin_unlock(&qd_lock);
1470 qd_put(old_qd);
1471
1472 gfs2_glock_put(qd->qd_gl);
1473 kmem_cache_free(gfs2_quotad_cachep, qd);
1474
1475 /* zero out the duplicate slot */
1476 lock_buffer(bh);
1477 memset(qc, 0, sizeof(*qc));
1478 mark_buffer_dirty(bh);
1479 unlock_buffer(bh);
1480
1481 continue;
1482 }
1483 BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1484 list_add(&qd->qd_list, &sdp->sd_quota_list);
1485 atomic_inc(&sdp->sd_quota_count);
1486 hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1487 spin_unlock_bucket(hash);
1488 spin_unlock(&qd_lock);
1489
1490 found++;
1491 }
1492
1493 if (buffer_dirty(bh))
1494 sync_dirty_buffer(bh);
1495 brelse(bh);
1496 dblock++;
1497 extlen--;
1498 }
1499
1500 if (found)
1501 fs_info(sdp, "found %u quota changes\n", found);
1502
1503 return 0;
1504
1505fail_brelse:
1506 if (buffer_dirty(bh))
1507 sync_dirty_buffer(bh);
1508 brelse(bh);
1509fail:
1510 gfs2_quota_cleanup(sdp);
1511 return error;
1512}
1513
1514void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1515{
1516 struct gfs2_quota_data *qd;
1517 LIST_HEAD(dispose);
1518 int count;
1519
1520 BUG_ON(!test_bit(SDF_NORECOVERY, &sdp->sd_flags) &&
1521 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags));
1522
1523 spin_lock(&qd_lock);
1524 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
1525 spin_lock(&qd->qd_lockref.lock);
1526 if (qd->qd_lockref.count != 0) {
1527 spin_unlock(&qd->qd_lockref.lock);
1528 continue;
1529 }
1530 lockref_mark_dead(&qd->qd_lockref);
1531 spin_unlock(&qd->qd_lockref.lock);
1532
1533 list_lru_del_obj(&gfs2_qd_lru, &qd->qd_lru);
1534 list_add(&qd->qd_lru, &dispose);
1535 }
1536 spin_unlock(&qd_lock);
1537
1538 gfs2_qd_list_dispose(&dispose);
1539
1540 wait_event_timeout(sdp->sd_kill_wait,
1541 (count = atomic_read(&sdp->sd_quota_count)) == 0,
1542 HZ * 60);
1543
1544 if (count != 0)
1545 fs_err(sdp, "%d left-over quota data objects\n", count);
1546
1547 kvfree(sdp->sd_quota_bitmap);
1548 sdp->sd_quota_bitmap = NULL;
1549}
1550
1551static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1552{
1553 if (error == 0 || error == -EROFS)
1554 return;
1555 if (!gfs2_withdrawing_or_withdrawn(sdp)) {
1556 if (!cmpxchg(&sdp->sd_log_error, 0, error))
1557 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1558 wake_up(&sdp->sd_logd_waitq);
1559 }
1560}
1561
1562static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1563 int (*fxn)(struct super_block *sb, int type),
1564 unsigned long t, unsigned long *timeo,
1565 unsigned int *new_timeo)
1566{
1567 if (t >= *timeo) {
1568 int error = fxn(sdp->sd_vfs, 0);
1569 quotad_error(sdp, msg, error);
1570 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1571 } else {
1572 *timeo -= t;
1573 }
1574}
1575
1576void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1577 if (!sdp->sd_statfs_force_sync) {
1578 sdp->sd_statfs_force_sync = 1;
1579 wake_up(&sdp->sd_quota_wait);
1580 }
1581}
1582
1583
1584/**
1585 * gfs2_quotad - Write cached quota changes into the quota file
1586 * @data: Pointer to GFS2 superblock
1587 *
1588 */
1589
1590int gfs2_quotad(void *data)
1591{
1592 struct gfs2_sbd *sdp = data;
1593 struct gfs2_tune *tune = &sdp->sd_tune;
1594 unsigned long statfs_timeo = 0;
1595 unsigned long quotad_timeo = 0;
1596 unsigned long t = 0;
1597
1598 set_freezable();
1599 while (!kthread_should_stop()) {
1600 if (gfs2_withdrawing_or_withdrawn(sdp))
1601 break;
1602
1603 /* Update the master statfs file */
1604 if (sdp->sd_statfs_force_sync) {
1605 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1606 quotad_error(sdp, "statfs", error);
1607 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1608 }
1609 else
1610 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1611 &statfs_timeo,
1612 &tune->gt_statfs_quantum);
1613
1614 /* Update quota file */
1615 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1616 "ad_timeo, &tune->gt_quota_quantum);
1617
1618 t = min(quotad_timeo, statfs_timeo);
1619
1620 t = wait_event_freezable_timeout(sdp->sd_quota_wait,
1621 sdp->sd_statfs_force_sync ||
1622 gfs2_withdrawing_or_withdrawn(sdp) ||
1623 kthread_should_stop(),
1624 t);
1625
1626 if (sdp->sd_statfs_force_sync)
1627 t = 0;
1628 }
1629
1630 return 0;
1631}
1632
1633static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1634{
1635 struct gfs2_sbd *sdp = sb->s_fs_info;
1636
1637 memset(state, 0, sizeof(*state));
1638
1639 switch (sdp->sd_args.ar_quota) {
1640 case GFS2_QUOTA_QUIET:
1641 fallthrough;
1642 case GFS2_QUOTA_ON:
1643 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1644 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1645 fallthrough;
1646 case GFS2_QUOTA_ACCOUNT:
1647 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1648 QCI_SYSFILE;
1649 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1650 QCI_SYSFILE;
1651 break;
1652 case GFS2_QUOTA_OFF:
1653 break;
1654 }
1655 if (sdp->sd_quota_inode) {
1656 state->s_state[USRQUOTA].ino =
1657 GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1658 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1659 }
1660 state->s_state[USRQUOTA].nextents = 1; /* unsupported */
1661 state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1662 state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1663 return 0;
1664}
1665
1666static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1667 struct qc_dqblk *fdq)
1668{
1669 struct gfs2_sbd *sdp = sb->s_fs_info;
1670 struct gfs2_quota_lvb *qlvb;
1671 struct gfs2_quota_data *qd;
1672 struct gfs2_holder q_gh;
1673 int error;
1674
1675 memset(fdq, 0, sizeof(*fdq));
1676
1677 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1678 return -ESRCH; /* Crazy XFS error code */
1679
1680 if ((qid.type != USRQUOTA) &&
1681 (qid.type != GRPQUOTA))
1682 return -EINVAL;
1683
1684 error = qd_get(sdp, qid, &qd);
1685 if (error)
1686 return error;
1687 error = do_glock(qd, FORCE, &q_gh);
1688 if (error)
1689 goto out;
1690
1691 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1692 fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1693 fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1694 fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1695
1696 gfs2_glock_dq_uninit(&q_gh);
1697out:
1698 qd_put(qd);
1699 return error;
1700}
1701
1702/* GFS2 only supports a subset of the XFS fields */
1703#define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1704
1705static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1706 struct qc_dqblk *fdq)
1707{
1708 struct gfs2_sbd *sdp = sb->s_fs_info;
1709 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1710 struct gfs2_quota_data *qd;
1711 struct gfs2_holder q_gh, i_gh;
1712 unsigned int data_blocks, ind_blocks;
1713 unsigned int blocks = 0;
1714 int alloc_required;
1715 loff_t offset;
1716 int error;
1717
1718 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1719 return -ESRCH; /* Crazy XFS error code */
1720
1721 if ((qid.type != USRQUOTA) &&
1722 (qid.type != GRPQUOTA))
1723 return -EINVAL;
1724
1725 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1726 return -EINVAL;
1727
1728 error = qd_get(sdp, qid, &qd);
1729 if (error)
1730 return error;
1731
1732 error = gfs2_qa_get(ip);
1733 if (error)
1734 goto out_put;
1735
1736 inode_lock(&ip->i_inode);
1737 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1738 if (error)
1739 goto out_unlockput;
1740 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1741 if (error)
1742 goto out_q;
1743
1744 /* Check for existing entry, if none then alloc new blocks */
1745 error = update_qd(sdp, qd);
1746 if (error)
1747 goto out_i;
1748
1749 /* If nothing has changed, this is a no-op */
1750 if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1751 ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1752 fdq->d_fieldmask ^= QC_SPC_SOFT;
1753
1754 if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1755 ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1756 fdq->d_fieldmask ^= QC_SPC_HARD;
1757
1758 if ((fdq->d_fieldmask & QC_SPACE) &&
1759 ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1760 fdq->d_fieldmask ^= QC_SPACE;
1761
1762 if (fdq->d_fieldmask == 0)
1763 goto out_i;
1764
1765 offset = qd2offset(qd);
1766 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1767 if (gfs2_is_stuffed(ip))
1768 alloc_required = 1;
1769 if (alloc_required) {
1770 struct gfs2_alloc_parms ap = {};
1771 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1772 &data_blocks, &ind_blocks);
1773 blocks = 1 + data_blocks + ind_blocks;
1774 ap.target = blocks;
1775 error = gfs2_inplace_reserve(ip, &ap);
1776 if (error)
1777 goto out_i;
1778 blocks += gfs2_rg_blocks(ip, blocks);
1779 }
1780
1781 /* Some quotas span block boundaries and can update two blocks,
1782 adding an extra block to the transaction to handle such quotas */
1783 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1784 if (error)
1785 goto out_release;
1786
1787 /* Apply changes */
1788 error = gfs2_adjust_quota(sdp, offset, 0, qd, fdq);
1789 if (!error)
1790 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1791
1792 gfs2_trans_end(sdp);
1793out_release:
1794 if (alloc_required)
1795 gfs2_inplace_release(ip);
1796out_i:
1797 gfs2_glock_dq_uninit(&i_gh);
1798out_q:
1799 gfs2_glock_dq_uninit(&q_gh);
1800out_unlockput:
1801 gfs2_qa_put(ip);
1802 inode_unlock(&ip->i_inode);
1803out_put:
1804 qd_put(qd);
1805 return error;
1806}
1807
1808const struct quotactl_ops gfs2_quotactl_ops = {
1809 .quota_sync = gfs2_quota_sync,
1810 .get_state = gfs2_quota_get_state,
1811 .get_dqblk = gfs2_get_dqblk,
1812 .set_dqblk = gfs2_set_dqblk,
1813};
1814
1815void __init gfs2_quota_hash_init(void)
1816{
1817 unsigned i;
1818
1819 for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1820 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1821}