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

source code of linux/fs/gfs2/quota.c