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