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 */
80 static DEFINE_SPINLOCK(qd_lock);
81 struct list_lru gfs2_qd_lru;
82
83 static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
84
gfs2_qd_hash(const struct gfs2_sbd * sdp,const struct kqid qid)85 static 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
spin_lock_bucket(unsigned int hash)96 static inline void spin_lock_bucket(unsigned int hash)
97 {
98 hlist_bl_lock(&qd_hash_table[hash]);
99 }
100
spin_unlock_bucket(unsigned int hash)101 static inline void spin_unlock_bucket(unsigned int hash)
102 {
103 hlist_bl_unlock(&qd_hash_table[hash]);
104 }
105
gfs2_qd_dealloc(struct rcu_head * rcu)106 static 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
gfs2_qd_dispose(struct gfs2_quota_data * qd)116 static 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
gfs2_qd_list_dispose(struct list_head * list)138 static 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
gfs2_qd_isolate(struct list_head * item,struct list_lru_one * lru,spinlock_t * lru_lock,void * arg)151 static enum lru_status gfs2_qd_isolate(struct list_head *item,
152 struct list_lru_one *lru, spinlock_t *lru_lock, 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
gfs2_qd_shrink_scan(struct shrinker * shrink,struct shrink_control * sc)173 static 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
gfs2_qd_shrink_count(struct shrinker * shrink,struct shrink_control * sc)190 static 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
196 static struct shrinker *gfs2_qd_shrinker;
197
gfs2_qd_shrinker_init(void)198 int __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
gfs2_qd_shrinker_exit(void)212 void gfs2_qd_shrinker_exit(void)
213 {
214 shrinker_free(gfs2_qd_shrinker);
215 }
216
qd2index(struct gfs2_quota_data * qd)217 static 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
qd2offset(struct gfs2_quota_data * qd)224 static u64 qd2offset(struct gfs2_quota_data *qd)
225 {
226 return qd2index(qd) * sizeof(struct gfs2_quota);
227 }
228
qd_alloc(unsigned hash,struct gfs2_sbd * sdp,struct kqid qid)229 static 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
253 fail:
254 kmem_cache_free(gfs2_quotad_cachep, qd);
255 return NULL;
256 }
257
gfs2_qd_search_bucket(unsigned int hash,const struct gfs2_sbd * sdp,struct kqid qid)258 static 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
qd_get(struct gfs2_sbd * sdp,struct kqid qid,struct gfs2_quota_data ** qdp)280 static 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
__qd_hold(struct gfs2_quota_data * qd)319 static 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
qd_put(struct gfs2_quota_data * qd)326 static 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
slot_get(struct gfs2_quota_data * qd)348 static 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++;
366 out:
367 spin_unlock(&sdp->sd_bitmap_lock);
368 return error;
369 }
370
slot_hold(struct gfs2_quota_data * qd)371 static 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
slot_put(struct gfs2_quota_data * qd)381 static 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
bh_get(struct gfs2_quota_data * qd)394 static 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
444 out:
445 brelse(bh);
446 return error;
447 }
448
bh_put(struct gfs2_quota_data * qd)449 static 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
qd_grab_sync(struct gfs2_sbd * sdp,struct gfs2_quota_data * qd,u64 sync_gen)465 static 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
486 out:
487 spin_unlock(&qd->qd_lockref.lock);
488 return ret;
489 }
490
qd_ungrab_sync(struct gfs2_quota_data * qd)491 static 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
qdsb_put(struct gfs2_quota_data * qd)498 static void qdsb_put(struct gfs2_quota_data *qd)
499 {
500 bh_put(qd);
501 slot_put(qd);
502 qd_put(qd);
503 }
504
qd_unlock(struct gfs2_quota_data * qd)505 static 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
qdsb_get(struct gfs2_sbd * sdp,struct kqid qid,struct gfs2_quota_data ** qdp)514 static 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
533 fail_slot:
534 slot_put(*qdp);
535 fail:
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 */
gfs2_qa_get(struct gfs2_inode * ip)545 int 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
gfs2_qa_put(struct gfs2_inode * ip)573 void 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
gfs2_quota_hold(struct gfs2_inode * ip,kuid_t uid,kgid_t gid)585 int 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
637 out_unhold:
638 if (error)
639 gfs2_quota_unhold(ip);
640 out:
641 return error;
642 }
643
gfs2_quota_unhold(struct gfs2_inode * ip)644 void 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
sort_qd(const void * a,const void * b)662 static 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
do_qc(struct gfs2_quota_data * qd,s64 change)674 static 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
gfs2_write_buf_to_page(struct gfs2_sbd * sdp,unsigned long index,unsigned off,void * buf,unsigned bytes)727 static 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
790 unlock_out:
791 folio_unlock(folio);
792 folio_put(folio);
793 return -EIO;
794 }
795
gfs2_write_disk_quota(struct gfs2_sbd * sdp,struct gfs2_quota * qp,loff_t loc)796 static 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
gfs2_adjust_quota(struct gfs2_sbd * sdp,loff_t loc,s64 change,struct gfs2_quota_data * qd,struct qc_dqblk * fdq)838 static 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
do_sync(unsigned int num_qd,struct gfs2_quota_data ** qda,u64 sync_gen)894 static 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
972 out_end_trans:
973 gfs2_trans_end(sdp);
974 out_ipres:
975 gfs2_inplace_release(ip);
976 out_alloc:
977 gfs2_glock_dq_uninit(&i_gh);
978 out_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
update_qd(struct gfs2_sbd * sdp,struct gfs2_quota_data * qd)997 static 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
do_glock(struct gfs2_quota_data * qd,int force_refresh,struct gfs2_holder * q_gh)1024 static 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);
1033 restart:
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
1068 fail_gunlock:
1069 gfs2_glock_dq_uninit(&i_gh);
1070 fail:
1071 gfs2_glock_dq_uninit(q_gh);
1072 return error;
1073 }
1074
gfs2_quota_lock(struct gfs2_inode * ip,kuid_t uid,kgid_t gid)1075 int 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
need_sync(struct gfs2_quota_data * qd)1110 static 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;
1141 out:
1142 spin_unlock(&qd->qd_lockref.lock);
1143 return ret;
1144 }
1145
gfs2_quota_unlock(struct gfs2_inode * ip)1146 void 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
print_message(struct gfs2_quota_data * qd,char * type)1198 static 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 */
gfs2_quota_check(struct gfs2_inode * ip,kuid_t uid,kgid_t gid,struct gfs2_alloc_parms * ap)1227 int 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
gfs2_quota_change(struct gfs2_inode * ip,s64 change,kuid_t uid,kgid_t gid)1285 void 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
gfs2_quota_sync(struct super_block * sb,int type)1311 int 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
gfs2_quota_refresh(struct gfs2_sbd * sdp,struct kqid qid)1372 int 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
gfs2_quota_init(struct gfs2_sbd * sdp)1390 int 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
1505 fail_brelse:
1506 if (buffer_dirty(bh))
1507 sync_dirty_buffer(bh);
1508 brelse(bh);
1509 fail:
1510 gfs2_quota_cleanup(sdp);
1511 return error;
1512 }
1513
gfs2_quota_cleanup(struct gfs2_sbd * sdp)1514 void 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
quotad_error(struct gfs2_sbd * sdp,const char * msg,int error)1551 static 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
quotad_check_timeo(struct gfs2_sbd * sdp,const char * msg,int (* fxn)(struct super_block * sb,int type),unsigned long t,unsigned long * timeo,unsigned int * new_timeo)1562 static 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
gfs2_wake_up_statfs(struct gfs2_sbd * sdp)1576 void 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
gfs2_quotad(void * data)1590 int 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
gfs2_quota_get_state(struct super_block * sb,struct qc_state * state)1633 static 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
gfs2_get_dqblk(struct super_block * sb,struct kqid qid,struct qc_dqblk * fdq)1666 static 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);
1697 out:
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
gfs2_set_dqblk(struct super_block * sb,struct kqid qid,struct qc_dqblk * fdq)1705 static 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);
1793 out_release:
1794 if (alloc_required)
1795 gfs2_inplace_release(ip);
1796 out_i:
1797 gfs2_glock_dq_uninit(&i_gh);
1798 out_q:
1799 gfs2_glock_dq_uninit(&q_gh);
1800 out_unlockput:
1801 gfs2_qa_put(ip);
1802 inode_unlock(&ip->i_inode);
1803 out_put:
1804 qd_put(qd);
1805 return error;
1806 }
1807
1808 const 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
gfs2_quota_hash_init(void)1815 void __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 }
1822