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TOMOYO Linux Cross Reference
Linux/fs/gfs2/quota.c

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  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 
 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 
 96 static inline void spin_lock_bucket(unsigned int hash)
 97 {
 98         hlist_bl_lock(&qd_hash_table[hash]);
 99 }
100 
101 static inline void spin_unlock_bucket(unsigned int hash)
102 {
103         hlist_bl_unlock(&qd_hash_table[hash]);
104 }
105 
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 
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 
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 
151 static enum lru_status gfs2_qd_isolate(struct list_head *item,
152                 struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
153 {
154         struct list_head *dispose = arg;
155         struct gfs2_quota_data *qd =
156                 list_entry(item, struct gfs2_quota_data, qd_lru);
157         enum lru_status status;
158 
159         if (!spin_trylock(&qd->qd_lockref.lock))
160                 return LRU_SKIP;
161 
162         status = LRU_SKIP;
163         if (qd->qd_lockref.count == 0) {
164                 lockref_mark_dead(&qd->qd_lockref);
165                 list_lru_isolate_move(lru, &qd->qd_lru, dispose);
166                 status = LRU_REMOVED;
167         }
168 
169         spin_unlock(&qd->qd_lockref.lock);
170         return status;
171 }
172 
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 
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 
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 
212 void gfs2_qd_shrinker_exit(void)
213 {
214         shrinker_free(gfs2_qd_shrinker);
215 }
216 
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 
224 static u64 qd2offset(struct gfs2_quota_data *qd)
225 {
226         return qd2index(qd) * sizeof(struct gfs2_quota);
227 }
228 
229 static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
230 {
231         struct gfs2_quota_data *qd;
232         int error;
233 
234         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
235         if (!qd)
236                 return NULL;
237 
238         qd->qd_sbd = sdp;
239         qd->qd_lockref.count = 0;
240         spin_lock_init(&qd->qd_lockref.lock);
241         qd->qd_id = qid;
242         qd->qd_slot = -1;
243         INIT_LIST_HEAD(&qd->qd_lru);
244         qd->qd_hash = hash;
245 
246         error = gfs2_glock_get(sdp, qd2index(qd),
247                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
248         if (error)
249                 goto fail;
250 
251         return qd;
252 
253 fail:
254         kmem_cache_free(gfs2_quotad_cachep, qd);
255         return NULL;
256 }
257 
258 static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
259                                                      const struct gfs2_sbd *sdp,
260                                                      struct kqid qid)
261 {
262         struct gfs2_quota_data *qd;
263         struct hlist_bl_node *h;
264 
265         hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
266                 if (!qid_eq(qd->qd_id, qid))
267                         continue;
268                 if (qd->qd_sbd != sdp)
269                         continue;
270                 if (lockref_get_not_dead(&qd->qd_lockref)) {
271                         list_lru_del_obj(&gfs2_qd_lru, &qd->qd_lru);
272                         return qd;
273                 }
274         }
275 
276         return NULL;
277 }
278 
279 
280 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
281                   struct gfs2_quota_data **qdp)
282 {
283         struct gfs2_quota_data *qd, *new_qd;
284         unsigned int hash = gfs2_qd_hash(sdp, qid);
285 
286         rcu_read_lock();
287         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
288         rcu_read_unlock();
289 
290         if (qd)
291                 return 0;
292 
293         new_qd = qd_alloc(hash, sdp, qid);
294         if (!new_qd)
295                 return -ENOMEM;
296 
297         spin_lock(&qd_lock);
298         spin_lock_bucket(hash);
299         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
300         if (qd == NULL) {
301                 new_qd->qd_lockref.count++;
302                 *qdp = new_qd;
303                 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
304                 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
305                 atomic_inc(&sdp->sd_quota_count);
306         }
307         spin_unlock_bucket(hash);
308         spin_unlock(&qd_lock);
309 
310         if (qd) {
311                 gfs2_glock_put(new_qd->qd_gl);
312                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
313         }
314 
315         return 0;
316 }
317 
318 
319 static void __qd_hold(struct gfs2_quota_data *qd)
320 {
321         struct gfs2_sbd *sdp = qd->qd_sbd;
322         gfs2_assert(sdp, qd->qd_lockref.count > 0);
323         qd->qd_lockref.count++;
324 }
325 
326 static void qd_put(struct gfs2_quota_data *qd)
327 {
328         struct gfs2_sbd *sdp;
329 
330         if (lockref_put_or_lock(&qd->qd_lockref))
331                 return;
332 
333         BUG_ON(__lockref_is_dead(&qd->qd_lockref));
334         sdp = qd->qd_sbd;
335         if (unlikely(!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))) {
336                 lockref_mark_dead(&qd->qd_lockref);
337                 spin_unlock(&qd->qd_lockref.lock);
338 
339                 gfs2_qd_dispose(qd);
340                 return;
341         }
342 
343         qd->qd_lockref.count = 0;
344         list_lru_add_obj(&gfs2_qd_lru, &qd->qd_lru);
345         spin_unlock(&qd->qd_lockref.lock);
346 }
347 
348 static int slot_get(struct gfs2_quota_data *qd)
349 {
350         struct gfs2_sbd *sdp = qd->qd_sbd;
351         unsigned int bit;
352         int error = 0;
353 
354         spin_lock(&sdp->sd_bitmap_lock);
355         if (qd->qd_slot_ref == 0) {
356                 bit = find_first_zero_bit(sdp->sd_quota_bitmap,
357                                           sdp->sd_quota_slots);
358                 if (bit >= sdp->sd_quota_slots) {
359                         error = -ENOSPC;
360                         goto out;
361                 }
362                 set_bit(bit, sdp->sd_quota_bitmap);
363                 qd->qd_slot = bit;
364         }
365         qd->qd_slot_ref++;
366 out:
367         spin_unlock(&sdp->sd_bitmap_lock);
368         return error;
369 }
370 
371 static void slot_hold(struct gfs2_quota_data *qd)
372 {
373         struct gfs2_sbd *sdp = qd->qd_sbd;
374 
375         spin_lock(&sdp->sd_bitmap_lock);
376         gfs2_assert(sdp, qd->qd_slot_ref);
377         qd->qd_slot_ref++;
378         spin_unlock(&sdp->sd_bitmap_lock);
379 }
380 
381 static void slot_put(struct gfs2_quota_data *qd)
382 {
383         struct gfs2_sbd *sdp = qd->qd_sbd;
384 
385         spin_lock(&sdp->sd_bitmap_lock);
386         gfs2_assert(sdp, qd->qd_slot_ref);
387         if (!--qd->qd_slot_ref) {
388                 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
389                 qd->qd_slot = -1;
390         }
391         spin_unlock(&sdp->sd_bitmap_lock);
392 }
393 
394 static int bh_get(struct gfs2_quota_data *qd)
395 {
396         struct gfs2_sbd *sdp = qd->qd_sbd;
397         struct inode *inode = sdp->sd_qc_inode;
398         struct gfs2_inode *ip = GFS2_I(inode);
399         unsigned int block, offset;
400         struct buffer_head *bh = NULL;
401         struct iomap iomap = { };
402         int error;
403 
404         spin_lock(&qd->qd_lockref.lock);
405         if (qd->qd_bh_count) {
406                 qd->qd_bh_count++;
407                 spin_unlock(&qd->qd_lockref.lock);
408                 return 0;
409         }
410         spin_unlock(&qd->qd_lockref.lock);
411 
412         block = qd->qd_slot / sdp->sd_qc_per_block;
413         offset = qd->qd_slot % sdp->sd_qc_per_block;
414 
415         error = gfs2_iomap_get(inode,
416                                (loff_t)block << inode->i_blkbits,
417                                i_blocksize(inode), &iomap);
418         if (error)
419                 return error;
420         error = -ENOENT;
421         if (iomap.type != IOMAP_MAPPED)
422                 return error;
423 
424         error = gfs2_meta_read(ip->i_gl, iomap.addr >> inode->i_blkbits,
425                                DIO_WAIT, 0, &bh);
426         if (error)
427                 return error;
428         error = -EIO;
429         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
430                 goto out;
431 
432         spin_lock(&qd->qd_lockref.lock);
433         if (qd->qd_bh == NULL) {
434                 qd->qd_bh = bh;
435                 qd->qd_bh_qc = (struct gfs2_quota_change *)
436                         (bh->b_data + sizeof(struct gfs2_meta_header) +
437                          offset * sizeof(struct gfs2_quota_change));
438                 bh = NULL;
439         }
440         qd->qd_bh_count++;
441         spin_unlock(&qd->qd_lockref.lock);
442         error = 0;
443 
444 out:
445         brelse(bh);
446         return error;
447 }
448 
449 static void bh_put(struct gfs2_quota_data *qd)
450 {
451         struct gfs2_sbd *sdp = qd->qd_sbd;
452         struct buffer_head *bh = NULL;
453 
454         spin_lock(&qd->qd_lockref.lock);
455         gfs2_assert(sdp, qd->qd_bh_count);
456         if (!--qd->qd_bh_count) {
457                 bh = qd->qd_bh;
458                 qd->qd_bh = NULL;
459                 qd->qd_bh_qc = NULL;
460         }
461         spin_unlock(&qd->qd_lockref.lock);
462         brelse(bh);
463 }
464 
465 static bool qd_grab_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
466                          u64 sync_gen)
467 {
468         bool ret = false;
469 
470         spin_lock(&qd->qd_lockref.lock);
471         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
472             !test_bit(QDF_CHANGE, &qd->qd_flags) ||
473             qd->qd_sync_gen >= sync_gen)
474                 goto out;
475 
476         if (__lockref_is_dead(&qd->qd_lockref))
477                 goto out;
478         qd->qd_lockref.count++;
479 
480         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
481         set_bit(QDF_LOCKED, &qd->qd_flags);
482         qd->qd_change_sync = qd->qd_change;
483         slot_hold(qd);
484         ret = true;
485 
486 out:
487         spin_unlock(&qd->qd_lockref.lock);
488         return ret;
489 }
490 
491 static void qd_ungrab_sync(struct gfs2_quota_data *qd)
492 {
493         clear_bit(QDF_LOCKED, &qd->qd_flags);
494         slot_put(qd);
495         qd_put(qd);
496 }
497 
498 static void qdsb_put(struct gfs2_quota_data *qd)
499 {
500         bh_put(qd);
501         slot_put(qd);
502         qd_put(qd);
503 }
504 
505 static void qd_unlock(struct gfs2_quota_data *qd)
506 {
507         spin_lock(&qd->qd_lockref.lock);
508         gfs2_assert_warn(qd->qd_sbd, test_bit(QDF_LOCKED, &qd->qd_flags));
509         clear_bit(QDF_LOCKED, &qd->qd_flags);
510         spin_unlock(&qd->qd_lockref.lock);
511         qdsb_put(qd);
512 }
513 
514 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
515                     struct gfs2_quota_data **qdp)
516 {
517         int error;
518 
519         error = qd_get(sdp, qid, qdp);
520         if (error)
521                 return error;
522 
523         error = slot_get(*qdp);
524         if (error)
525                 goto fail;
526 
527         error = bh_get(*qdp);
528         if (error)
529                 goto fail_slot;
530 
531         return 0;
532 
533 fail_slot:
534         slot_put(*qdp);
535 fail:
536         qd_put(*qdp);
537         return error;
538 }
539 
540 /**
541  * gfs2_qa_get - make sure we have a quota allocations data structure,
542  *               if necessary
543  * @ip: the inode for this reservation
544  */
545 int gfs2_qa_get(struct gfs2_inode *ip)
546 {
547         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
548         struct inode *inode = &ip->i_inode;
549 
550         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
551                 return 0;
552 
553         spin_lock(&inode->i_lock);
554         if (ip->i_qadata == NULL) {
555                 struct gfs2_qadata *tmp;
556 
557                 spin_unlock(&inode->i_lock);
558                 tmp = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
559                 if (!tmp)
560                         return -ENOMEM;
561 
562                 spin_lock(&inode->i_lock);
563                 if (ip->i_qadata == NULL)
564                         ip->i_qadata = tmp;
565                 else
566                         kmem_cache_free(gfs2_qadata_cachep, tmp);
567         }
568         ip->i_qadata->qa_ref++;
569         spin_unlock(&inode->i_lock);
570         return 0;
571 }
572 
573 void gfs2_qa_put(struct gfs2_inode *ip)
574 {
575         struct inode *inode = &ip->i_inode;
576 
577         spin_lock(&inode->i_lock);
578         if (ip->i_qadata && --ip->i_qadata->qa_ref == 0) {
579                 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
580                 ip->i_qadata = NULL;
581         }
582         spin_unlock(&inode->i_lock);
583 }
584 
585 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
586 {
587         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
588         struct gfs2_quota_data **qd;
589         int error;
590 
591         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
592                 return 0;
593 
594         error = gfs2_qa_get(ip);
595         if (error)
596                 return error;
597 
598         qd = ip->i_qadata->qa_qd;
599 
600         if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
601             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) {
602                 error = -EIO;
603                 gfs2_qa_put(ip);
604                 goto out;
605         }
606 
607         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
608         if (error)
609                 goto out_unhold;
610         ip->i_qadata->qa_qd_num++;
611         qd++;
612 
613         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
614         if (error)
615                 goto out_unhold;
616         ip->i_qadata->qa_qd_num++;
617         qd++;
618 
619         if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
620             !uid_eq(uid, ip->i_inode.i_uid)) {
621                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
622                 if (error)
623                         goto out_unhold;
624                 ip->i_qadata->qa_qd_num++;
625                 qd++;
626         }
627 
628         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
629             !gid_eq(gid, ip->i_inode.i_gid)) {
630                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
631                 if (error)
632                         goto out_unhold;
633                 ip->i_qadata->qa_qd_num++;
634                 qd++;
635         }
636 
637 out_unhold:
638         if (error)
639                 gfs2_quota_unhold(ip);
640 out:
641         return error;
642 }
643 
644 void gfs2_quota_unhold(struct gfs2_inode *ip)
645 {
646         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
647         u32 x;
648 
649         if (ip->i_qadata == NULL)
650                 return;
651 
652         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
653 
654         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
655                 qdsb_put(ip->i_qadata->qa_qd[x]);
656                 ip->i_qadata->qa_qd[x] = NULL;
657         }
658         ip->i_qadata->qa_qd_num = 0;
659         gfs2_qa_put(ip);
660 }
661 
662 static int sort_qd(const void *a, const void *b)
663 {
664         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
665         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
666 
667         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
668                 return -1;
669         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
670                 return 1;
671         return 0;
672 }
673 
674 static void do_qc(struct gfs2_quota_data *qd, s64 change)
675 {
676         struct gfs2_sbd *sdp = qd->qd_sbd;
677         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
678         struct gfs2_quota_change *qc = qd->qd_bh_qc;
679         bool needs_put = false;
680         s64 x;
681 
682         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
683 
684         /*
685          * The QDF_CHANGE flag indicates that the slot in the quota change file
686          * is used.  Here, we use the value of qc->qc_change when the slot is
687          * used, and we assume a value of 0 otherwise.
688          */
689 
690         spin_lock(&qd->qd_lockref.lock);
691 
692         x = 0;
693         if (test_bit(QDF_CHANGE, &qd->qd_flags))
694                 x = be64_to_cpu(qc->qc_change);
695         x += change;
696         qd->qd_change += change;
697 
698         if (!x && test_bit(QDF_CHANGE, &qd->qd_flags)) {
699                 /* The slot in the quota change file becomes unused. */
700                 clear_bit(QDF_CHANGE, &qd->qd_flags);
701                 qc->qc_flags = 0;
702                 qc->qc_id = 0;
703                 needs_put = true;
704         } else if (x && !test_bit(QDF_CHANGE, &qd->qd_flags)) {
705                 /* The slot in the quota change file becomes used. */
706                 set_bit(QDF_CHANGE, &qd->qd_flags);
707                 __qd_hold(qd);
708                 slot_hold(qd);
709 
710                 qc->qc_flags = 0;
711                 if (qd->qd_id.type == USRQUOTA)
712                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
713                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
714         }
715         qc->qc_change = cpu_to_be64(x);
716 
717         spin_unlock(&qd->qd_lockref.lock);
718 
719         if (needs_put) {
720                 slot_put(qd);
721                 qd_put(qd);
722         }
723         if (change < 0) /* Reset quiet flag if we freed some blocks */
724                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
725 }
726 
727 static int gfs2_write_buf_to_page(struct gfs2_sbd *sdp, unsigned long index,
728                                   unsigned off, void *buf, unsigned bytes)
729 {
730         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
731         struct inode *inode = &ip->i_inode;
732         struct address_space *mapping = inode->i_mapping;
733         struct folio *folio;
734         struct buffer_head *bh;
735         u64 blk;
736         unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
737         unsigned to_write = bytes, pg_off = off;
738 
739         blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
740         boff = off % bsize;
741 
742         folio = filemap_grab_folio(mapping, index);
743         if (IS_ERR(folio))
744                 return PTR_ERR(folio);
745         bh = folio_buffers(folio);
746         if (!bh)
747                 bh = create_empty_buffers(folio, bsize, 0);
748 
749         for (;;) {
750                 /* Find the beginning block within the folio */
751                 if (pg_off >= ((bnum * bsize) + bsize)) {
752                         bh = bh->b_this_page;
753                         bnum++;
754                         blk++;
755                         continue;
756                 }
757                 if (!buffer_mapped(bh)) {
758                         gfs2_block_map(inode, blk, bh, 1);
759                         if (!buffer_mapped(bh))
760                                 goto unlock_out;
761                         /* If it's a newly allocated disk block, zero it */
762                         if (buffer_new(bh))
763                                 folio_zero_range(folio, bnum * bsize,
764                                                 bh->b_size);
765                 }
766                 if (folio_test_uptodate(folio))
767                         set_buffer_uptodate(bh);
768                 if (bh_read(bh, REQ_META | REQ_PRIO) < 0)
769                         goto unlock_out;
770                 gfs2_trans_add_data(ip->i_gl, bh);
771 
772                 /* If we need to write to the next block as well */
773                 if (to_write > (bsize - boff)) {
774                         pg_off += (bsize - boff);
775                         to_write -= (bsize - boff);
776                         boff = pg_off % bsize;
777                         continue;
778                 }
779                 break;
780         }
781 
782         /* Write to the folio, now that we have setup the buffer(s) */
783         memcpy_to_folio(folio, off, buf, bytes);
784         flush_dcache_folio(folio);
785         folio_unlock(folio);
786         folio_put(folio);
787 
788         return 0;
789 
790 unlock_out:
791         folio_unlock(folio);
792         folio_put(folio);
793         return -EIO;
794 }
795 
796 static int gfs2_write_disk_quota(struct gfs2_sbd *sdp, struct gfs2_quota *qp,
797                                  loff_t loc)
798 {
799         unsigned long pg_beg;
800         unsigned pg_off, nbytes, overflow = 0;
801         int error;
802         void *ptr;
803 
804         nbytes = sizeof(struct gfs2_quota);
805 
806         pg_beg = loc >> PAGE_SHIFT;
807         pg_off = offset_in_page(loc);
808 
809         /* If the quota straddles a page boundary, split the write in two */
810         if ((pg_off + nbytes) > PAGE_SIZE)
811                 overflow = (pg_off + nbytes) - PAGE_SIZE;
812 
813         ptr = qp;
814         error = gfs2_write_buf_to_page(sdp, pg_beg, pg_off, ptr,
815                                        nbytes - overflow);
816         /* If there's an overflow, write the remaining bytes to the next page */
817         if (!error && overflow)
818                 error = gfs2_write_buf_to_page(sdp, pg_beg + 1, 0,
819                                                ptr + nbytes - overflow,
820                                                overflow);
821         return error;
822 }
823 
824 /**
825  * gfs2_adjust_quota - adjust record of current block usage
826  * @sdp: The superblock
827  * @loc: Offset of the entry in the quota file
828  * @change: The amount of usage change to record
829  * @qd: The quota data
830  * @fdq: The updated limits to record
831  *
832  * This function was mostly borrowed from gfs2_block_truncate_page which was
833  * in turn mostly borrowed from ext3
834  *
835  * Returns: 0 or -ve on error
836  */
837 
838 static int gfs2_adjust_quota(struct gfs2_sbd *sdp, loff_t loc,
839                              s64 change, struct gfs2_quota_data *qd,
840                              struct qc_dqblk *fdq)
841 {
842         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
843         struct inode *inode = &ip->i_inode;
844         struct gfs2_quota q;
845         int err;
846         u64 size;
847 
848         if (gfs2_is_stuffed(ip)) {
849                 err = gfs2_unstuff_dinode(ip);
850                 if (err)
851                         return err;
852         }
853 
854         memset(&q, 0, sizeof(struct gfs2_quota));
855         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
856         if (err < 0)
857                 return err;
858 
859         loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
860         be64_add_cpu(&q.qu_value, change);
861         if (((s64)be64_to_cpu(q.qu_value)) < 0)
862                 q.qu_value = 0; /* Never go negative on quota usage */
863         spin_lock(&qd->qd_lockref.lock);
864         qd->qd_qb.qb_value = q.qu_value;
865         if (fdq) {
866                 if (fdq->d_fieldmask & QC_SPC_SOFT) {
867                         q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
868                         qd->qd_qb.qb_warn = q.qu_warn;
869                 }
870                 if (fdq->d_fieldmask & QC_SPC_HARD) {
871                         q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
872                         qd->qd_qb.qb_limit = q.qu_limit;
873                 }
874                 if (fdq->d_fieldmask & QC_SPACE) {
875                         q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
876                         qd->qd_qb.qb_value = q.qu_value;
877                 }
878         }
879         spin_unlock(&qd->qd_lockref.lock);
880 
881         err = gfs2_write_disk_quota(sdp, &q, loc);
882         if (!err) {
883                 size = loc + sizeof(struct gfs2_quota);
884                 if (size > inode->i_size)
885                         i_size_write(inode, size);
886                 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
887                 mark_inode_dirty(inode);
888                 set_bit(QDF_REFRESH, &qd->qd_flags);
889         }
890 
891         return err;
892 }
893 
894 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda,
895                    u64 sync_gen)
896 {
897         struct gfs2_sbd *sdp = (*qda)->qd_sbd;
898         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
899         struct gfs2_alloc_parms ap = {};
900         unsigned int data_blocks, ind_blocks;
901         struct gfs2_holder *ghs, i_gh;
902         unsigned int qx, x;
903         struct gfs2_quota_data *qd;
904         unsigned reserved;
905         loff_t offset;
906         unsigned int nalloc = 0, blocks;
907         int error;
908 
909         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
910                               &data_blocks, &ind_blocks);
911 
912         ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
913         if (!ghs)
914                 return -ENOMEM;
915 
916         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
917         inode_lock(&ip->i_inode);
918         for (qx = 0; qx < num_qd; qx++) {
919                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
920                                            GL_NOCACHE, &ghs[qx]);
921                 if (error)
922                         goto out_dq;
923         }
924 
925         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
926         if (error)
927                 goto out_dq;
928 
929         for (x = 0; x < num_qd; x++) {
930                 offset = qd2offset(qda[x]);
931                 if (gfs2_write_alloc_required(ip, offset,
932                                               sizeof(struct gfs2_quota)))
933                         nalloc++;
934         }
935 
936         /* 
937          * 1 blk for unstuffing inode if stuffed. We add this extra
938          * block to the reservation unconditionally. If the inode
939          * doesn't need unstuffing, the block will be released to the 
940          * rgrp since it won't be allocated during the transaction
941          */
942         /* +3 in the end for unstuffing block, inode size update block
943          * and another block in case quota straddles page boundary and 
944          * two blocks need to be updated instead of 1 */
945         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
946 
947         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
948         ap.target = reserved;
949         error = gfs2_inplace_reserve(ip, &ap);
950         if (error)
951                 goto out_alloc;
952 
953         if (nalloc)
954                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
955 
956         error = gfs2_trans_begin(sdp, blocks, 0);
957         if (error)
958                 goto out_ipres;
959 
960         for (x = 0; x < num_qd; x++) {
961                 qd = qda[x];
962                 offset = qd2offset(qd);
963                 error = gfs2_adjust_quota(sdp, offset, qd->qd_change_sync, qd,
964                                                         NULL);
965                 if (error)
966                         goto out_end_trans;
967 
968                 do_qc(qd, -qd->qd_change_sync);
969                 set_bit(QDF_REFRESH, &qd->qd_flags);
970         }
971 
972 out_end_trans:
973         gfs2_trans_end(sdp);
974 out_ipres:
975         gfs2_inplace_release(ip);
976 out_alloc:
977         gfs2_glock_dq_uninit(&i_gh);
978 out_dq:
979         while (qx--)
980                 gfs2_glock_dq_uninit(&ghs[qx]);
981         inode_unlock(&ip->i_inode);
982         kfree(ghs);
983         gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl,
984                        GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
985         if (!error) {
986                 for (x = 0; x < num_qd; x++) {
987                         qd = qda[x];
988                         spin_lock(&qd->qd_lockref.lock);
989                         if (qd->qd_sync_gen < sync_gen)
990                                 qd->qd_sync_gen = sync_gen;
991                         spin_unlock(&qd->qd_lockref.lock);
992                 }
993         }
994         return error;
995 }
996 
997 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
998 {
999         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1000         struct gfs2_quota q;
1001         struct gfs2_quota_lvb *qlvb;
1002         loff_t pos;
1003         int error;
1004 
1005         memset(&q, 0, sizeof(struct gfs2_quota));
1006         pos = qd2offset(qd);
1007         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
1008         if (error < 0)
1009                 return error;
1010 
1011         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1012         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
1013         qlvb->__pad = 0;
1014         qlvb->qb_limit = q.qu_limit;
1015         qlvb->qb_warn = q.qu_warn;
1016         qlvb->qb_value = q.qu_value;
1017         spin_lock(&qd->qd_lockref.lock);
1018         qd->qd_qb = *qlvb;
1019         spin_unlock(&qd->qd_lockref.lock);
1020 
1021         return 0;
1022 }
1023 
1024 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
1025                     struct gfs2_holder *q_gh)
1026 {
1027         struct gfs2_sbd *sdp = qd->qd_sbd;
1028         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1029         struct gfs2_holder i_gh;
1030         int error;
1031 
1032         gfs2_assert_warn(sdp, sdp == qd->qd_gl->gl_name.ln_sbd);
1033 restart:
1034         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
1035         if (error)
1036                 return error;
1037 
1038         if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1039                 force_refresh = FORCE;
1040 
1041         spin_lock(&qd->qd_lockref.lock);
1042         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1043         spin_unlock(&qd->qd_lockref.lock);
1044 
1045         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1046                 gfs2_glock_dq_uninit(q_gh);
1047                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1048                                            GL_NOCACHE, q_gh);
1049                 if (error)
1050                         return error;
1051 
1052                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1053                 if (error)
1054                         goto fail;
1055 
1056                 error = update_qd(sdp, qd);
1057                 if (error)
1058                         goto fail_gunlock;
1059 
1060                 gfs2_glock_dq_uninit(&i_gh);
1061                 gfs2_glock_dq_uninit(q_gh);
1062                 force_refresh = 0;
1063                 goto restart;
1064         }
1065 
1066         return 0;
1067 
1068 fail_gunlock:
1069         gfs2_glock_dq_uninit(&i_gh);
1070 fail:
1071         gfs2_glock_dq_uninit(q_gh);
1072         return error;
1073 }
1074 
1075 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1076 {
1077         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1078         struct gfs2_quota_data *qd;
1079         u32 x;
1080         int error;
1081 
1082         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1083                 return 0;
1084 
1085         error = gfs2_quota_hold(ip, uid, gid);
1086         if (error)
1087                 return error;
1088 
1089         sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1090              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1091 
1092         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1093                 qd = ip->i_qadata->qa_qd[x];
1094                 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1095                 if (error)
1096                         break;
1097         }
1098 
1099         if (!error)
1100                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1101         else {
1102                 while (x--)
1103                         gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1104                 gfs2_quota_unhold(ip);
1105         }
1106 
1107         return error;
1108 }
1109 
1110 static bool need_sync(struct gfs2_quota_data *qd)
1111 {
1112         struct gfs2_sbd *sdp = qd->qd_sbd;
1113         struct gfs2_tune *gt = &sdp->sd_tune;
1114         s64 value, change, limit;
1115         unsigned int num, den;
1116         int ret = false;
1117 
1118         spin_lock(&qd->qd_lockref.lock);
1119         if (!qd->qd_qb.qb_limit)
1120                 goto out;
1121 
1122         change = qd->qd_change;
1123         if (change <= 0)
1124                 goto out;
1125         value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1126         limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1127         if (value >= limit)
1128                 goto out;
1129 
1130         spin_lock(&gt->gt_spin);
1131         num = gt->gt_quota_scale_num;
1132         den = gt->gt_quota_scale_den;
1133         spin_unlock(&gt->gt_spin);
1134 
1135         change *= gfs2_jindex_size(sdp) * num;
1136         change = div_s64(change, den);
1137         if (value + change < limit)
1138                 goto out;
1139 
1140         ret = true;
1141 out:
1142         spin_unlock(&qd->qd_lockref.lock);
1143         return ret;
1144 }
1145 
1146 void gfs2_quota_unlock(struct gfs2_inode *ip)
1147 {
1148         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1149         struct gfs2_quota_data *qda[2 * GFS2_MAXQUOTAS];
1150         unsigned int count = 0;
1151         u32 x;
1152 
1153         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1154                 return;
1155 
1156         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1157                 struct gfs2_quota_data *qd;
1158                 bool sync;
1159                 int error;
1160 
1161                 qd = ip->i_qadata->qa_qd[x];
1162                 sync = need_sync(qd);
1163 
1164                 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1165                 if (!sync)
1166                         continue;
1167 
1168                 spin_lock(&qd_lock);
1169                 sync = qd_grab_sync(sdp, qd, U64_MAX);
1170                 spin_unlock(&qd_lock);
1171 
1172                 if (!sync)
1173                         continue;
1174 
1175                 gfs2_assert_warn(sdp, qd->qd_change_sync);
1176                 error = bh_get(qd);
1177                 if (error) {
1178                         qd_ungrab_sync(qd);
1179                         continue;
1180                 }
1181 
1182                 qda[count++] = qd;
1183         }
1184 
1185         if (count) {
1186                 u64 sync_gen = READ_ONCE(sdp->sd_quota_sync_gen);
1187 
1188                 do_sync(count, qda, sync_gen);
1189                 for (x = 0; x < count; x++)
1190                         qd_unlock(qda[x]);
1191         }
1192 
1193         gfs2_quota_unhold(ip);
1194 }
1195 
1196 #define MAX_LINE 256
1197 
1198 static void print_message(struct gfs2_quota_data *qd, char *type)
1199 {
1200         struct gfs2_sbd *sdp = qd->qd_sbd;
1201 
1202         if (sdp->sd_args.ar_quota != GFS2_QUOTA_QUIET) {
1203                 fs_info(sdp, "quota %s for %s %u\n",
1204                         type,
1205                         (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1206                         from_kqid(&init_user_ns, qd->qd_id));
1207         }
1208 }
1209 
1210 /**
1211  * gfs2_quota_check - check if allocating new blocks will exceed quota
1212  * @ip:  The inode for which this check is being performed
1213  * @uid: The uid to check against
1214  * @gid: The gid to check against
1215  * @ap:  The allocation parameters. ap->target contains the requested
1216  *       blocks. ap->min_target, if set, contains the minimum blks
1217  *       requested.
1218  *
1219  * Returns: 0 on success.
1220  *                  min_req = ap->min_target ? ap->min_target : ap->target;
1221  *                  quota must allow at least min_req blks for success and
1222  *                  ap->allowed is set to the number of blocks allowed
1223  *
1224  *          -EDQUOT otherwise, quota violation. ap->allowed is set to number
1225  *                  of blocks available.
1226  */
1227 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1228                      struct gfs2_alloc_parms *ap)
1229 {
1230         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1231         struct gfs2_quota_data *qd;
1232         s64 value, warn, limit;
1233         u32 x;
1234         int error = 0;
1235 
1236         ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1237         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1238                 return 0;
1239 
1240         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1241                 qd = ip->i_qadata->qa_qd[x];
1242 
1243                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1244                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1245                         continue;
1246 
1247                 spin_lock(&qd->qd_lockref.lock);
1248                 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1249                 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1250                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1251                 value += qd->qd_change;
1252                 spin_unlock(&qd->qd_lockref.lock);
1253 
1254                 if (limit > 0 && (limit - value) < ap->allowed)
1255                         ap->allowed = limit - value;
1256                 /* If we can't meet the target */
1257                 if (limit && limit < (value + (s64)ap->target)) {
1258                         /* If no min_target specified or we don't meet
1259                          * min_target, return -EDQUOT */
1260                         if (!ap->min_target || ap->min_target > ap->allowed) {
1261                                 if (!test_and_set_bit(QDF_QMSG_QUIET,
1262                                                       &qd->qd_flags)) {
1263                                         print_message(qd, "exceeded");
1264                                         quota_send_warning(qd->qd_id,
1265                                                            sdp->sd_vfs->s_dev,
1266                                                            QUOTA_NL_BHARDWARN);
1267                                 }
1268                                 error = -EDQUOT;
1269                                 break;
1270                         }
1271                 } else if (warn && warn < value &&
1272                            time_after_eq(jiffies, qd->qd_last_warn +
1273                                          gfs2_tune_get(sdp, gt_quota_warn_period)
1274                                          * HZ)) {
1275                         quota_send_warning(qd->qd_id,
1276                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1277                         print_message(qd, "warning");
1278                         error = 0;
1279                         qd->qd_last_warn = jiffies;
1280                 }
1281         }
1282         return error;
1283 }
1284 
1285 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1286                        kuid_t uid, kgid_t gid)
1287 {
1288         struct gfs2_quota_data *qd;
1289         u32 x;
1290         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1291 
1292         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF ||
1293             gfs2_assert_warn(sdp, change))
1294                 return;
1295         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1296                 return;
1297 
1298         if (gfs2_assert_withdraw(sdp, ip->i_qadata &&
1299                                  ip->i_qadata->qa_ref > 0))
1300                 return;
1301         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1302                 qd = ip->i_qadata->qa_qd[x];
1303 
1304                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1305                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1306                         do_qc(qd, change);
1307                 }
1308         }
1309 }
1310 
1311 int gfs2_quota_sync(struct super_block *sb, int type)
1312 {
1313         struct gfs2_sbd *sdp = sb->s_fs_info;
1314         struct gfs2_quota_data **qda;
1315         unsigned int max_qd = PAGE_SIZE / sizeof(struct gfs2_holder);
1316         u64 sync_gen;
1317         int error = 0;
1318 
1319         if (sb_rdonly(sdp->sd_vfs))
1320                 return 0;
1321 
1322         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1323         if (!qda)
1324                 return -ENOMEM;
1325 
1326         mutex_lock(&sdp->sd_quota_sync_mutex);
1327         sync_gen = sdp->sd_quota_sync_gen + 1;
1328 
1329         do {
1330                 struct gfs2_quota_data *iter;
1331                 unsigned int num_qd = 0;
1332                 unsigned int x;
1333 
1334                 spin_lock(&qd_lock);
1335                 list_for_each_entry(iter, &sdp->sd_quota_list, qd_list) {
1336                         if (qd_grab_sync(sdp, iter, sync_gen)) {
1337                                 qda[num_qd++] = iter;
1338                                 if (num_qd == max_qd)
1339                                         break;
1340                         }
1341                 }
1342                 spin_unlock(&qd_lock);
1343 
1344                 if (!num_qd)
1345                         break;
1346 
1347                 for (x = 0; x < num_qd; x++) {
1348                         error = bh_get(qda[x]);
1349                         if (!error)
1350                                 continue;
1351 
1352                         while (x < num_qd)
1353                                 qd_ungrab_sync(qda[--num_qd]);
1354                         break;
1355                 }
1356 
1357                 if (!error) {
1358                         WRITE_ONCE(sdp->sd_quota_sync_gen, sync_gen);
1359                         error = do_sync(num_qd, qda, sync_gen);
1360                 }
1361 
1362                 for (x = 0; x < num_qd; x++)
1363                         qd_unlock(qda[x]);
1364         } while (!error);
1365 
1366         mutex_unlock(&sdp->sd_quota_sync_mutex);
1367         kfree(qda);
1368 
1369         return error;
1370 }
1371 
1372 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1373 {
1374         struct gfs2_quota_data *qd;
1375         struct gfs2_holder q_gh;
1376         int error;
1377 
1378         error = qd_get(sdp, qid, &qd);
1379         if (error)
1380                 return error;
1381 
1382         error = do_glock(qd, FORCE, &q_gh);
1383         if (!error)
1384                 gfs2_glock_dq_uninit(&q_gh);
1385 
1386         qd_put(qd);
1387         return error;
1388 }
1389 
1390 int gfs2_quota_init(struct gfs2_sbd *sdp)
1391 {
1392         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1393         u64 size = i_size_read(sdp->sd_qc_inode);
1394         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1395         unsigned int x, slot = 0;
1396         unsigned int found = 0;
1397         unsigned int hash;
1398         unsigned int bm_size;
1399         struct buffer_head *bh;
1400         u64 dblock;
1401         u32 extlen = 0;
1402         int error;
1403 
1404         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1405                 return -EIO;
1406 
1407         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1408         bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1409         bm_size *= sizeof(unsigned long);
1410         error = -ENOMEM;
1411         sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1412         if (sdp->sd_quota_bitmap == NULL)
1413                 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1414                                                  __GFP_ZERO);
1415         if (!sdp->sd_quota_bitmap)
1416                 return error;
1417 
1418         for (x = 0; x < blocks; x++) {
1419                 struct gfs2_quota_change *qc;
1420                 unsigned int y;
1421 
1422                 if (!extlen) {
1423                         extlen = 32;
1424                         error = gfs2_get_extent(&ip->i_inode, x, &dblock, &extlen);
1425                         if (error)
1426                                 goto fail;
1427                 }
1428                 error = -EIO;
1429                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1430                 if (!bh)
1431                         goto fail;
1432                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
1433                         goto fail_brelse;
1434 
1435                 qc = (struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1436                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1437                      y++, slot++) {
1438                         struct gfs2_quota_data *old_qd, *qd;
1439                         s64 qc_change = be64_to_cpu(qc->qc_change);
1440                         u32 qc_flags = be32_to_cpu(qc->qc_flags);
1441                         enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1442                                                 USRQUOTA : GRPQUOTA;
1443                         struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1444                                                       be32_to_cpu(qc->qc_id));
1445                         qc++;
1446                         if (!qc_change)
1447                                 continue;
1448 
1449                         hash = gfs2_qd_hash(sdp, qc_id);
1450                         qd = qd_alloc(hash, sdp, qc_id);
1451                         if (qd == NULL)
1452                                 goto fail_brelse;
1453 
1454                         set_bit(QDF_CHANGE, &qd->qd_flags);
1455                         qd->qd_change = qc_change;
1456                         qd->qd_slot = slot;
1457                         qd->qd_slot_ref = 1;
1458 
1459                         spin_lock(&qd_lock);
1460                         spin_lock_bucket(hash);
1461                         old_qd = gfs2_qd_search_bucket(hash, sdp, qc_id);
1462                         if (old_qd) {
1463                                 fs_err(sdp, "Corruption found in quota_change%u"
1464                                             "file: duplicate identifier in "
1465                                             "slot %u\n",
1466                                             sdp->sd_jdesc->jd_jid, slot);
1467 
1468                                 spin_unlock_bucket(hash);
1469                                 spin_unlock(&qd_lock);
1470                                 qd_put(old_qd);
1471 
1472                                 gfs2_glock_put(qd->qd_gl);
1473                                 kmem_cache_free(gfs2_quotad_cachep, qd);
1474 
1475                                 /* zero out the duplicate slot */
1476                                 lock_buffer(bh);
1477                                 memset(qc, 0, sizeof(*qc));
1478                                 mark_buffer_dirty(bh);
1479                                 unlock_buffer(bh);
1480 
1481                                 continue;
1482                         }
1483                         BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1484                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1485                         atomic_inc(&sdp->sd_quota_count);
1486                         hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1487                         spin_unlock_bucket(hash);
1488                         spin_unlock(&qd_lock);
1489 
1490                         found++;
1491                 }
1492 
1493                 if (buffer_dirty(bh))
1494                         sync_dirty_buffer(bh);
1495                 brelse(bh);
1496                 dblock++;
1497                 extlen--;
1498         }
1499 
1500         if (found)
1501                 fs_info(sdp, "found %u quota changes\n", found);
1502 
1503         return 0;
1504 
1505 fail_brelse:
1506         if (buffer_dirty(bh))
1507                 sync_dirty_buffer(bh);
1508         brelse(bh);
1509 fail:
1510         gfs2_quota_cleanup(sdp);
1511         return error;
1512 }
1513 
1514 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1515 {
1516         struct gfs2_quota_data *qd;
1517         LIST_HEAD(dispose);
1518         int count;
1519 
1520         BUG_ON(!test_bit(SDF_NORECOVERY, &sdp->sd_flags) &&
1521                 test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags));
1522 
1523         spin_lock(&qd_lock);
1524         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
1525                 spin_lock(&qd->qd_lockref.lock);
1526                 if (qd->qd_lockref.count != 0) {
1527                         spin_unlock(&qd->qd_lockref.lock);
1528                         continue;
1529                 }
1530                 lockref_mark_dead(&qd->qd_lockref);
1531                 spin_unlock(&qd->qd_lockref.lock);
1532 
1533                 list_lru_del_obj(&gfs2_qd_lru, &qd->qd_lru);
1534                 list_add(&qd->qd_lru, &dispose);
1535         }
1536         spin_unlock(&qd_lock);
1537 
1538         gfs2_qd_list_dispose(&dispose);
1539 
1540         wait_event_timeout(sdp->sd_kill_wait,
1541                 (count = atomic_read(&sdp->sd_quota_count)) == 0,
1542                 HZ * 60);
1543 
1544         if (count != 0)
1545                 fs_err(sdp, "%d left-over quota data objects\n", count);
1546 
1547         kvfree(sdp->sd_quota_bitmap);
1548         sdp->sd_quota_bitmap = NULL;
1549 }
1550 
1551 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1552 {
1553         if (error == 0 || error == -EROFS)
1554                 return;
1555         if (!gfs2_withdrawing_or_withdrawn(sdp)) {
1556                 if (!cmpxchg(&sdp->sd_log_error, 0, error))
1557                         fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1558                 wake_up(&sdp->sd_logd_waitq);
1559         }
1560 }
1561 
1562 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1563                                int (*fxn)(struct super_block *sb, int type),
1564                                unsigned long t, unsigned long *timeo,
1565                                unsigned int *new_timeo)
1566 {
1567         if (t >= *timeo) {
1568                 int error = fxn(sdp->sd_vfs, 0);
1569                 quotad_error(sdp, msg, error);
1570                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1571         } else {
1572                 *timeo -= t;
1573         }
1574 }
1575 
1576 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1577         if (!sdp->sd_statfs_force_sync) {
1578                 sdp->sd_statfs_force_sync = 1;
1579                 wake_up(&sdp->sd_quota_wait);
1580         }
1581 }
1582 
1583 
1584 /**
1585  * gfs2_quotad - Write cached quota changes into the quota file
1586  * @data: Pointer to GFS2 superblock
1587  *
1588  */
1589 
1590 int gfs2_quotad(void *data)
1591 {
1592         struct gfs2_sbd *sdp = data;
1593         struct gfs2_tune *tune = &sdp->sd_tune;
1594         unsigned long statfs_timeo = 0;
1595         unsigned long quotad_timeo = 0;
1596         unsigned long t = 0;
1597 
1598         set_freezable();
1599         while (!kthread_should_stop()) {
1600                 if (gfs2_withdrawing_or_withdrawn(sdp))
1601                         break;
1602 
1603                 /* Update the master statfs file */
1604                 if (sdp->sd_statfs_force_sync) {
1605                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1606                         quotad_error(sdp, "statfs", error);
1607                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1608                 }
1609                 else
1610                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1611                                            &statfs_timeo,
1612                                            &tune->gt_statfs_quantum);
1613 
1614                 /* Update quota file */
1615                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1616                                    &quotad_timeo, &tune->gt_quota_quantum);
1617 
1618                 t = min(quotad_timeo, statfs_timeo);
1619 
1620                 t = wait_event_freezable_timeout(sdp->sd_quota_wait,
1621                                 sdp->sd_statfs_force_sync ||
1622                                 gfs2_withdrawing_or_withdrawn(sdp) ||
1623                                 kthread_should_stop(),
1624                                 t);
1625 
1626                 if (sdp->sd_statfs_force_sync)
1627                         t = 0;
1628         }
1629 
1630         return 0;
1631 }
1632 
1633 static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1634 {
1635         struct gfs2_sbd *sdp = sb->s_fs_info;
1636 
1637         memset(state, 0, sizeof(*state));
1638 
1639         switch (sdp->sd_args.ar_quota) {
1640         case GFS2_QUOTA_QUIET:
1641                 fallthrough;
1642         case GFS2_QUOTA_ON:
1643                 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1644                 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1645                 fallthrough;
1646         case GFS2_QUOTA_ACCOUNT:
1647                 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1648                                                   QCI_SYSFILE;
1649                 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1650                                                   QCI_SYSFILE;
1651                 break;
1652         case GFS2_QUOTA_OFF:
1653                 break;
1654         }
1655         if (sdp->sd_quota_inode) {
1656                 state->s_state[USRQUOTA].ino =
1657                                         GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1658                 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1659         }
1660         state->s_state[USRQUOTA].nextents = 1;  /* unsupported */
1661         state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1662         state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1663         return 0;
1664 }
1665 
1666 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1667                           struct qc_dqblk *fdq)
1668 {
1669         struct gfs2_sbd *sdp = sb->s_fs_info;
1670         struct gfs2_quota_lvb *qlvb;
1671         struct gfs2_quota_data *qd;
1672         struct gfs2_holder q_gh;
1673         int error;
1674 
1675         memset(fdq, 0, sizeof(*fdq));
1676 
1677         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1678                 return -ESRCH; /* Crazy XFS error code */
1679 
1680         if ((qid.type != USRQUOTA) &&
1681             (qid.type != GRPQUOTA))
1682                 return -EINVAL;
1683 
1684         error = qd_get(sdp, qid, &qd);
1685         if (error)
1686                 return error;
1687         error = do_glock(qd, FORCE, &q_gh);
1688         if (error)
1689                 goto out;
1690 
1691         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1692         fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1693         fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1694         fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1695 
1696         gfs2_glock_dq_uninit(&q_gh);
1697 out:
1698         qd_put(qd);
1699         return error;
1700 }
1701 
1702 /* GFS2 only supports a subset of the XFS fields */
1703 #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1704 
1705 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1706                           struct qc_dqblk *fdq)
1707 {
1708         struct gfs2_sbd *sdp = sb->s_fs_info;
1709         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1710         struct gfs2_quota_data *qd;
1711         struct gfs2_holder q_gh, i_gh;
1712         unsigned int data_blocks, ind_blocks;
1713         unsigned int blocks = 0;
1714         int alloc_required;
1715         loff_t offset;
1716         int error;
1717 
1718         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1719                 return -ESRCH; /* Crazy XFS error code */
1720 
1721         if ((qid.type != USRQUOTA) &&
1722             (qid.type != GRPQUOTA))
1723                 return -EINVAL;
1724 
1725         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1726                 return -EINVAL;
1727 
1728         error = qd_get(sdp, qid, &qd);
1729         if (error)
1730                 return error;
1731 
1732         error = gfs2_qa_get(ip);
1733         if (error)
1734                 goto out_put;
1735 
1736         inode_lock(&ip->i_inode);
1737         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1738         if (error)
1739                 goto out_unlockput;
1740         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1741         if (error)
1742                 goto out_q;
1743 
1744         /* Check for existing entry, if none then alloc new blocks */
1745         error = update_qd(sdp, qd);
1746         if (error)
1747                 goto out_i;
1748 
1749         /* If nothing has changed, this is a no-op */
1750         if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1751             ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1752                 fdq->d_fieldmask ^= QC_SPC_SOFT;
1753 
1754         if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1755             ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1756                 fdq->d_fieldmask ^= QC_SPC_HARD;
1757 
1758         if ((fdq->d_fieldmask & QC_SPACE) &&
1759             ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1760                 fdq->d_fieldmask ^= QC_SPACE;
1761 
1762         if (fdq->d_fieldmask == 0)
1763                 goto out_i;
1764 
1765         offset = qd2offset(qd);
1766         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1767         if (gfs2_is_stuffed(ip))
1768                 alloc_required = 1;
1769         if (alloc_required) {
1770                 struct gfs2_alloc_parms ap = {};
1771                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1772                                        &data_blocks, &ind_blocks);
1773                 blocks = 1 + data_blocks + ind_blocks;
1774                 ap.target = blocks;
1775                 error = gfs2_inplace_reserve(ip, &ap);
1776                 if (error)
1777                         goto out_i;
1778                 blocks += gfs2_rg_blocks(ip, blocks);
1779         }
1780 
1781         /* Some quotas span block boundaries and can update two blocks,
1782            adding an extra block to the transaction to handle such quotas */
1783         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1784         if (error)
1785                 goto out_release;
1786 
1787         /* Apply changes */
1788         error = gfs2_adjust_quota(sdp, offset, 0, qd, fdq);
1789         if (!error)
1790                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1791 
1792         gfs2_trans_end(sdp);
1793 out_release:
1794         if (alloc_required)
1795                 gfs2_inplace_release(ip);
1796 out_i:
1797         gfs2_glock_dq_uninit(&i_gh);
1798 out_q:
1799         gfs2_glock_dq_uninit(&q_gh);
1800 out_unlockput:
1801         gfs2_qa_put(ip);
1802         inode_unlock(&ip->i_inode);
1803 out_put:
1804         qd_put(qd);
1805         return error;
1806 }
1807 
1808 const struct quotactl_ops gfs2_quotactl_ops = {
1809         .quota_sync     = gfs2_quota_sync,
1810         .get_state      = gfs2_quota_get_state,
1811         .get_dqblk      = gfs2_get_dqblk,
1812         .set_dqblk      = gfs2_set_dqblk,
1813 };
1814 
1815 void __init gfs2_quota_hash_init(void)
1816 {
1817         unsigned i;
1818 
1819         for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1820                 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1821 }
1822 

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