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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 */
80static DEFINE_SPINLOCK(qd_lock);
81struct list_lru gfs2_qd_lru;
82
83static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
84
85static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
86 const struct kqid qid)
87{
88 unsigned int h;
89
90 h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
91 h = jhash(&qid, sizeof(struct kqid), h);
92
93 return h & GFS2_QD_HASH_MASK;
94}
95
96static inline void spin_lock_bucket(unsigned int hash)
97{
98 hlist_bl_lock(&qd_hash_table[hash]);
99}
100
101static inline void spin_unlock_bucket(unsigned int hash)
102{
103 hlist_bl_unlock(&qd_hash_table[hash]);
104}
105
106static void gfs2_qd_dealloc(struct rcu_head *rcu)
107{
108 struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
109 kmem_cache_free(gfs2_quotad_cachep, qd);
110}
111
112static void gfs2_qd_dispose(struct list_head *list)
113{
114 struct gfs2_quota_data *qd;
115 struct gfs2_sbd *sdp;
116
117 while (!list_empty(list)) {
118 qd = list_first_entry(list, struct gfs2_quota_data, qd_lru);
119 sdp = qd->qd_gl->gl_name.ln_sbd;
120
121 list_del(&qd->qd_lru);
122
123 /* Free from the filesystem-specific list */
124 spin_lock(&qd_lock);
125 list_del(&qd->qd_list);
126 spin_unlock(&qd_lock);
127
128 spin_lock_bucket(qd->qd_hash);
129 hlist_bl_del_rcu(&qd->qd_hlist);
130 spin_unlock_bucket(qd->qd_hash);
131
132 gfs2_assert_warn(sdp, !qd->qd_change);
133 gfs2_assert_warn(sdp, !qd->qd_slot_count);
134 gfs2_assert_warn(sdp, !qd->qd_bh_count);
135
136 gfs2_glock_put(qd->qd_gl);
137 atomic_dec(&sdp->sd_quota_count);
138
139 /* Delete it from the common reclaim list */
140 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
141 }
142}
143
144
145static enum lru_status gfs2_qd_isolate(struct list_head *item,
146 struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
147{
148 struct list_head *dispose = arg;
149 struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
150
151 if (!spin_trylock(&qd->qd_lockref.lock))
152 return LRU_SKIP;
153
154 if (qd->qd_lockref.count == 0) {
155 lockref_mark_dead(&qd->qd_lockref);
156 list_lru_isolate_move(lru, &qd->qd_lru, dispose);
157 }
158
159 spin_unlock(&qd->qd_lockref.lock);
160 return LRU_REMOVED;
161}
162
163static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
164 struct shrink_control *sc)
165{
166 LIST_HEAD(dispose);
167 unsigned long freed;
168
169 if (!(sc->gfp_mask & __GFP_FS))
170 return SHRINK_STOP;
171
172 freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
173 gfs2_qd_isolate, &dispose);
174
175 gfs2_qd_dispose(&dispose);
176
177 return freed;
178}
179
180static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
181 struct shrink_control *sc)
182{
183 return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
184}
185
186struct shrinker gfs2_qd_shrinker = {
187 .count_objects = gfs2_qd_shrink_count,
188 .scan_objects = gfs2_qd_shrink_scan,
189 .seeks = DEFAULT_SEEKS,
190 .flags = SHRINKER_NUMA_AWARE,
191};
192
193
194static u64 qd2index(struct gfs2_quota_data *qd)
195{
196 struct kqid qid = qd->qd_id;
197 return (2 * (u64)from_kqid(&init_user_ns, qid)) +
198 ((qid.type == USRQUOTA) ? 0 : 1);
199}
200
201static u64 qd2offset(struct gfs2_quota_data *qd)
202{
203 u64 offset;
204
205 offset = qd2index(qd);
206 offset *= sizeof(struct gfs2_quota);
207
208 return offset;
209}
210
211static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
212{
213 struct gfs2_quota_data *qd;
214 int error;
215
216 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
217 if (!qd)
218 return NULL;
219
220 qd->qd_sbd = sdp;
221 qd->qd_lockref.count = 1;
222 spin_lock_init(&qd->qd_lockref.lock);
223 qd->qd_id = qid;
224 qd->qd_slot = -1;
225 INIT_LIST_HEAD(&qd->qd_lru);
226 qd->qd_hash = hash;
227
228 error = gfs2_glock_get(sdp, qd2index(qd),
229 &gfs2_quota_glops, CREATE, &qd->qd_gl);
230 if (error)
231 goto fail;
232
233 return qd;
234
235fail:
236 kmem_cache_free(gfs2_quotad_cachep, qd);
237 return NULL;
238}
239
240static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
241 const struct gfs2_sbd *sdp,
242 struct kqid qid)
243{
244 struct gfs2_quota_data *qd;
245 struct hlist_bl_node *h;
246
247 hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
248 if (!qid_eq(qd->qd_id, qid))
249 continue;
250 if (qd->qd_sbd != sdp)
251 continue;
252 if (lockref_get_not_dead(&qd->qd_lockref)) {
253 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
254 return qd;
255 }
256 }
257
258 return NULL;
259}
260
261
262static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
263 struct gfs2_quota_data **qdp)
264{
265 struct gfs2_quota_data *qd, *new_qd;
266 unsigned int hash = gfs2_qd_hash(sdp, qid);
267
268 rcu_read_lock();
269 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
270 rcu_read_unlock();
271
272 if (qd)
273 return 0;
274
275 new_qd = qd_alloc(hash, sdp, qid);
276 if (!new_qd)
277 return -ENOMEM;
278
279 spin_lock(&qd_lock);
280 spin_lock_bucket(hash);
281 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
282 if (qd == NULL) {
283 *qdp = new_qd;
284 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
285 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
286 atomic_inc(&sdp->sd_quota_count);
287 }
288 spin_unlock_bucket(hash);
289 spin_unlock(&qd_lock);
290
291 if (qd) {
292 gfs2_glock_put(new_qd->qd_gl);
293 kmem_cache_free(gfs2_quotad_cachep, new_qd);
294 }
295
296 return 0;
297}
298
299
300static void qd_hold(struct gfs2_quota_data *qd)
301{
302 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
303 gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
304 lockref_get(&qd->qd_lockref);
305}
306
307static void qd_put(struct gfs2_quota_data *qd)
308{
309 if (lockref_put_or_lock(&qd->qd_lockref))
310 return;
311
312 qd->qd_lockref.count = 0;
313 list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
314 spin_unlock(&qd->qd_lockref.lock);
315
316}
317
318static int slot_get(struct gfs2_quota_data *qd)
319{
320 struct gfs2_sbd *sdp = qd->qd_sbd;
321 unsigned int bit;
322 int error = 0;
323
324 spin_lock(&sdp->sd_bitmap_lock);
325 if (qd->qd_slot_count != 0)
326 goto out;
327
328 error = -ENOSPC;
329 bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
330 if (bit < sdp->sd_quota_slots) {
331 set_bit(bit, sdp->sd_quota_bitmap);
332 qd->qd_slot = bit;
333 error = 0;
334out:
335 qd->qd_slot_count++;
336 }
337 spin_unlock(&sdp->sd_bitmap_lock);
338
339 return error;
340}
341
342static void slot_hold(struct gfs2_quota_data *qd)
343{
344 struct gfs2_sbd *sdp = qd->qd_sbd;
345
346 spin_lock(&sdp->sd_bitmap_lock);
347 gfs2_assert(sdp, qd->qd_slot_count);
348 qd->qd_slot_count++;
349 spin_unlock(&sdp->sd_bitmap_lock);
350}
351
352static void slot_put(struct gfs2_quota_data *qd)
353{
354 struct gfs2_sbd *sdp = qd->qd_sbd;
355
356 spin_lock(&sdp->sd_bitmap_lock);
357 gfs2_assert(sdp, qd->qd_slot_count);
358 if (!--qd->qd_slot_count) {
359 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
360 qd->qd_slot = -1;
361 }
362 spin_unlock(&sdp->sd_bitmap_lock);
363}
364
365static int bh_get(struct gfs2_quota_data *qd)
366{
367 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
368 struct inode *inode = sdp->sd_qc_inode;
369 struct gfs2_inode *ip = GFS2_I(inode);
370 unsigned int block, offset;
371 struct buffer_head *bh;
372 struct iomap iomap = { };
373 int error;
374
375 mutex_lock(&sdp->sd_quota_mutex);
376
377 if (qd->qd_bh_count++) {
378 mutex_unlock(&sdp->sd_quota_mutex);
379 return 0;
380 }
381
382 block = qd->qd_slot / sdp->sd_qc_per_block;
383 offset = qd->qd_slot % sdp->sd_qc_per_block;
384
385 error = gfs2_iomap_get(inode,
386 (loff_t)block << inode->i_blkbits,
387 i_blocksize(inode), &iomap);
388 if (error)
389 goto fail;
390 error = -ENOENT;
391 if (iomap.type != IOMAP_MAPPED)
392 goto fail;
393
394 error = gfs2_meta_read(ip->i_gl, iomap.addr >> inode->i_blkbits,
395 DIO_WAIT, 0, &bh);
396 if (error)
397 goto fail;
398 error = -EIO;
399 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
400 goto fail_brelse;
401
402 qd->qd_bh = bh;
403 qd->qd_bh_qc = (struct gfs2_quota_change *)
404 (bh->b_data + sizeof(struct gfs2_meta_header) +
405 offset * sizeof(struct gfs2_quota_change));
406
407 mutex_unlock(&sdp->sd_quota_mutex);
408
409 return 0;
410
411fail_brelse:
412 brelse(bh);
413fail:
414 qd->qd_bh_count--;
415 mutex_unlock(&sdp->sd_quota_mutex);
416 return error;
417}
418
419static void bh_put(struct gfs2_quota_data *qd)
420{
421 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
422
423 mutex_lock(&sdp->sd_quota_mutex);
424 gfs2_assert(sdp, qd->qd_bh_count);
425 if (!--qd->qd_bh_count) {
426 brelse(qd->qd_bh);
427 qd->qd_bh = NULL;
428 qd->qd_bh_qc = NULL;
429 }
430 mutex_unlock(&sdp->sd_quota_mutex);
431}
432
433static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
434 u64 *sync_gen)
435{
436 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
437 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
438 (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
439 return 0;
440
441 if (!lockref_get_not_dead(&qd->qd_lockref))
442 return 0;
443
444 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
445 set_bit(QDF_LOCKED, &qd->qd_flags);
446 qd->qd_change_sync = qd->qd_change;
447 slot_hold(qd);
448 return 1;
449}
450
451static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
452{
453 struct gfs2_quota_data *qd = NULL, *iter;
454 int error;
455
456 *qdp = NULL;
457
458 if (sb_rdonly(sdp->sd_vfs))
459 return 0;
460
461 spin_lock(&qd_lock);
462
463 list_for_each_entry(iter, &sdp->sd_quota_list, qd_list) {
464 if (qd_check_sync(sdp, iter, &sdp->sd_quota_sync_gen)) {
465 qd = iter;
466 break;
467 }
468 }
469
470 spin_unlock(&qd_lock);
471
472 if (qd) {
473 gfs2_assert_warn(sdp, qd->qd_change_sync);
474 error = bh_get(qd);
475 if (error) {
476 clear_bit(QDF_LOCKED, &qd->qd_flags);
477 slot_put(qd);
478 qd_put(qd);
479 return error;
480 }
481 }
482
483 *qdp = qd;
484
485 return 0;
486}
487
488static void qd_unlock(struct gfs2_quota_data *qd)
489{
490 gfs2_assert_warn(qd->qd_gl->gl_name.ln_sbd,
491 test_bit(QDF_LOCKED, &qd->qd_flags));
492 clear_bit(QDF_LOCKED, &qd->qd_flags);
493 bh_put(qd);
494 slot_put(qd);
495 qd_put(qd);
496}
497
498static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
499 struct gfs2_quota_data **qdp)
500{
501 int error;
502
503 error = qd_get(sdp, qid, qdp);
504 if (error)
505 return error;
506
507 error = slot_get(*qdp);
508 if (error)
509 goto fail;
510
511 error = bh_get(*qdp);
512 if (error)
513 goto fail_slot;
514
515 return 0;
516
517fail_slot:
518 slot_put(*qdp);
519fail:
520 qd_put(*qdp);
521 return error;
522}
523
524static void qdsb_put(struct gfs2_quota_data *qd)
525{
526 bh_put(qd);
527 slot_put(qd);
528 qd_put(qd);
529}
530
531/**
532 * gfs2_qa_get - make sure we have a quota allocations data structure,
533 * if necessary
534 * @ip: the inode for this reservation
535 */
536int gfs2_qa_get(struct gfs2_inode *ip)
537{
538 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
539 struct inode *inode = &ip->i_inode;
540
541 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
542 return 0;
543
544 spin_lock(&inode->i_lock);
545 if (ip->i_qadata == NULL) {
546 struct gfs2_qadata *tmp;
547
548 spin_unlock(&inode->i_lock);
549 tmp = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
550 if (!tmp)
551 return -ENOMEM;
552
553 spin_lock(&inode->i_lock);
554 if (ip->i_qadata == NULL)
555 ip->i_qadata = tmp;
556 else
557 kmem_cache_free(gfs2_qadata_cachep, tmp);
558 }
559 ip->i_qadata->qa_ref++;
560 spin_unlock(&inode->i_lock);
561 return 0;
562}
563
564void gfs2_qa_put(struct gfs2_inode *ip)
565{
566 struct inode *inode = &ip->i_inode;
567
568 spin_lock(&inode->i_lock);
569 if (ip->i_qadata && --ip->i_qadata->qa_ref == 0) {
570 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
571 ip->i_qadata = NULL;
572 }
573 spin_unlock(&inode->i_lock);
574}
575
576int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
577{
578 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
579 struct gfs2_quota_data **qd;
580 int error;
581
582 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
583 return 0;
584
585 error = gfs2_qa_get(ip);
586 if (error)
587 return error;
588
589 qd = ip->i_qadata->qa_qd;
590
591 if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
592 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) {
593 error = -EIO;
594 goto out;
595 }
596
597 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
598 if (error)
599 goto out_unhold;
600 ip->i_qadata->qa_qd_num++;
601 qd++;
602
603 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
604 if (error)
605 goto out_unhold;
606 ip->i_qadata->qa_qd_num++;
607 qd++;
608
609 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
610 !uid_eq(uid, ip->i_inode.i_uid)) {
611 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
612 if (error)
613 goto out_unhold;
614 ip->i_qadata->qa_qd_num++;
615 qd++;
616 }
617
618 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
619 !gid_eq(gid, ip->i_inode.i_gid)) {
620 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
621 if (error)
622 goto out_unhold;
623 ip->i_qadata->qa_qd_num++;
624 qd++;
625 }
626
627out_unhold:
628 if (error)
629 gfs2_quota_unhold(ip);
630out:
631 return error;
632}
633
634void gfs2_quota_unhold(struct gfs2_inode *ip)
635{
636 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
637 u32 x;
638
639 if (ip->i_qadata == NULL)
640 return;
641
642 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
643
644 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
645 qdsb_put(ip->i_qadata->qa_qd[x]);
646 ip->i_qadata->qa_qd[x] = NULL;
647 }
648 ip->i_qadata->qa_qd_num = 0;
649 gfs2_qa_put(ip);
650}
651
652static int sort_qd(const void *a, const void *b)
653{
654 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
655 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
656
657 if (qid_lt(qd_a->qd_id, qd_b->qd_id))
658 return -1;
659 if (qid_lt(qd_b->qd_id, qd_a->qd_id))
660 return 1;
661 return 0;
662}
663
664static void do_qc(struct gfs2_quota_data *qd, s64 change)
665{
666 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
667 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
668 struct gfs2_quota_change *qc = qd->qd_bh_qc;
669 s64 x;
670
671 mutex_lock(&sdp->sd_quota_mutex);
672 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
673
674 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
675 qc->qc_change = 0;
676 qc->qc_flags = 0;
677 if (qd->qd_id.type == USRQUOTA)
678 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
679 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
680 }
681
682 x = be64_to_cpu(qc->qc_change) + change;
683 qc->qc_change = cpu_to_be64(x);
684
685 spin_lock(&qd_lock);
686 qd->qd_change = x;
687 spin_unlock(&qd_lock);
688
689 if (!x) {
690 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
691 clear_bit(QDF_CHANGE, &qd->qd_flags);
692 qc->qc_flags = 0;
693 qc->qc_id = 0;
694 slot_put(qd);
695 qd_put(qd);
696 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
697 qd_hold(qd);
698 slot_hold(qd);
699 }
700
701 if (change < 0) /* Reset quiet flag if we freed some blocks */
702 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
703 mutex_unlock(&sdp->sd_quota_mutex);
704}
705
706static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
707 unsigned off, void *buf, unsigned bytes)
708{
709 struct inode *inode = &ip->i_inode;
710 struct gfs2_sbd *sdp = GFS2_SB(inode);
711 struct address_space *mapping = inode->i_mapping;
712 struct page *page;
713 struct buffer_head *bh;
714 void *kaddr;
715 u64 blk;
716 unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
717 unsigned to_write = bytes, pg_off = off;
718 int done = 0;
719
720 blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
721 boff = off % bsize;
722
723 page = find_or_create_page(mapping, index, GFP_NOFS);
724 if (!page)
725 return -ENOMEM;
726 if (!page_has_buffers(page))
727 create_empty_buffers(page, bsize, 0);
728
729 bh = page_buffers(page);
730 while (!done) {
731 /* Find the beginning block within the page */
732 if (pg_off >= ((bnum * bsize) + bsize)) {
733 bh = bh->b_this_page;
734 bnum++;
735 blk++;
736 continue;
737 }
738 if (!buffer_mapped(bh)) {
739 gfs2_block_map(inode, blk, bh, 1);
740 if (!buffer_mapped(bh))
741 goto unlock_out;
742 /* If it's a newly allocated disk block, zero it */
743 if (buffer_new(bh))
744 zero_user(page, bnum * bsize, bh->b_size);
745 }
746 if (PageUptodate(page))
747 set_buffer_uptodate(bh);
748 if (bh_read(bh, REQ_META | REQ_PRIO) < 0)
749 goto unlock_out;
750 if (gfs2_is_jdata(ip))
751 gfs2_trans_add_data(ip->i_gl, bh);
752 else
753 gfs2_ordered_add_inode(ip);
754
755 /* If we need to write to the next block as well */
756 if (to_write > (bsize - boff)) {
757 pg_off += (bsize - boff);
758 to_write -= (bsize - boff);
759 boff = pg_off % bsize;
760 continue;
761 }
762 done = 1;
763 }
764
765 /* Write to the page, now that we have setup the buffer(s) */
766 kaddr = kmap_atomic(page);
767 memcpy(kaddr + off, buf, bytes);
768 flush_dcache_page(page);
769 kunmap_atomic(kaddr);
770 unlock_page(page);
771 put_page(page);
772
773 return 0;
774
775unlock_out:
776 unlock_page(page);
777 put_page(page);
778 return -EIO;
779}
780
781static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp,
782 loff_t loc)
783{
784 unsigned long pg_beg;
785 unsigned pg_off, nbytes, overflow = 0;
786 int pg_oflow = 0, error;
787 void *ptr;
788
789 nbytes = sizeof(struct gfs2_quota);
790
791 pg_beg = loc >> PAGE_SHIFT;
792 pg_off = offset_in_page(loc);
793
794 /* If the quota straddles a page boundary, split the write in two */
795 if ((pg_off + nbytes) > PAGE_SIZE) {
796 pg_oflow = 1;
797 overflow = (pg_off + nbytes) - PAGE_SIZE;
798 }
799
800 ptr = qp;
801 error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr,
802 nbytes - overflow);
803 /* If there's an overflow, write the remaining bytes to the next page */
804 if (!error && pg_oflow)
805 error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0,
806 ptr + nbytes - overflow,
807 overflow);
808 return error;
809}
810
811/**
812 * gfs2_adjust_quota - adjust record of current block usage
813 * @ip: The quota inode
814 * @loc: Offset of the entry in the quota file
815 * @change: The amount of usage change to record
816 * @qd: The quota data
817 * @fdq: The updated limits to record
818 *
819 * This function was mostly borrowed from gfs2_block_truncate_page which was
820 * in turn mostly borrowed from ext3
821 *
822 * Returns: 0 or -ve on error
823 */
824
825static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
826 s64 change, struct gfs2_quota_data *qd,
827 struct qc_dqblk *fdq)
828{
829 struct inode *inode = &ip->i_inode;
830 struct gfs2_sbd *sdp = GFS2_SB(inode);
831 struct gfs2_quota q;
832 int err;
833 u64 size;
834
835 if (gfs2_is_stuffed(ip)) {
836 err = gfs2_unstuff_dinode(ip);
837 if (err)
838 return err;
839 }
840
841 memset(&q, 0, sizeof(struct gfs2_quota));
842 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
843 if (err < 0)
844 return err;
845
846 loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
847 err = -EIO;
848 be64_add_cpu(&q.qu_value, change);
849 if (((s64)be64_to_cpu(q.qu_value)) < 0)
850 q.qu_value = 0; /* Never go negative on quota usage */
851 qd->qd_qb.qb_value = q.qu_value;
852 if (fdq) {
853 if (fdq->d_fieldmask & QC_SPC_SOFT) {
854 q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
855 qd->qd_qb.qb_warn = q.qu_warn;
856 }
857 if (fdq->d_fieldmask & QC_SPC_HARD) {
858 q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
859 qd->qd_qb.qb_limit = q.qu_limit;
860 }
861 if (fdq->d_fieldmask & QC_SPACE) {
862 q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
863 qd->qd_qb.qb_value = q.qu_value;
864 }
865 }
866
867 err = gfs2_write_disk_quota(ip, &q, loc);
868 if (!err) {
869 size = loc + sizeof(struct gfs2_quota);
870 if (size > inode->i_size)
871 i_size_write(inode, size);
872 inode->i_mtime = inode->i_atime = current_time(inode);
873 mark_inode_dirty(inode);
874 set_bit(QDF_REFRESH, &qd->qd_flags);
875 }
876
877 return err;
878}
879
880static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
881{
882 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_name.ln_sbd;
883 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
884 struct gfs2_alloc_parms ap = { .aflags = 0, };
885 unsigned int data_blocks, ind_blocks;
886 struct gfs2_holder *ghs, i_gh;
887 unsigned int qx, x;
888 struct gfs2_quota_data *qd;
889 unsigned reserved;
890 loff_t offset;
891 unsigned int nalloc = 0, blocks;
892 int error;
893
894 error = gfs2_qa_get(ip);
895 if (error)
896 return error;
897
898 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
899 &data_blocks, &ind_blocks);
900
901 ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
902 if (!ghs) {
903 error = -ENOMEM;
904 goto out;
905 }
906
907 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
908 inode_lock(&ip->i_inode);
909 for (qx = 0; qx < num_qd; qx++) {
910 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
911 GL_NOCACHE, &ghs[qx]);
912 if (error)
913 goto out_dq;
914 }
915
916 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
917 if (error)
918 goto out_dq;
919
920 for (x = 0; x < num_qd; x++) {
921 offset = qd2offset(qda[x]);
922 if (gfs2_write_alloc_required(ip, offset,
923 sizeof(struct gfs2_quota)))
924 nalloc++;
925 }
926
927 /*
928 * 1 blk for unstuffing inode if stuffed. We add this extra
929 * block to the reservation unconditionally. If the inode
930 * doesn't need unstuffing, the block will be released to the
931 * rgrp since it won't be allocated during the transaction
932 */
933 /* +3 in the end for unstuffing block, inode size update block
934 * and another block in case quota straddles page boundary and
935 * two blocks need to be updated instead of 1 */
936 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
937
938 reserved = 1 + (nalloc * (data_blocks + ind_blocks));
939 ap.target = reserved;
940 error = gfs2_inplace_reserve(ip, &ap);
941 if (error)
942 goto out_alloc;
943
944 if (nalloc)
945 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
946
947 error = gfs2_trans_begin(sdp, blocks, 0);
948 if (error)
949 goto out_ipres;
950
951 for (x = 0; x < num_qd; x++) {
952 qd = qda[x];
953 offset = qd2offset(qd);
954 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
955 if (error)
956 goto out_end_trans;
957
958 do_qc(qd, -qd->qd_change_sync);
959 set_bit(QDF_REFRESH, &qd->qd_flags);
960 }
961
962 error = 0;
963
964out_end_trans:
965 gfs2_trans_end(sdp);
966out_ipres:
967 gfs2_inplace_release(ip);
968out_alloc:
969 gfs2_glock_dq_uninit(&i_gh);
970out_dq:
971 while (qx--)
972 gfs2_glock_dq_uninit(&ghs[qx]);
973 inode_unlock(&ip->i_inode);
974 kfree(ghs);
975 gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl,
976 GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
977out:
978 gfs2_qa_put(ip);
979 return error;
980}
981
982static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
983{
984 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
985 struct gfs2_quota q;
986 struct gfs2_quota_lvb *qlvb;
987 loff_t pos;
988 int error;
989
990 memset(&q, 0, sizeof(struct gfs2_quota));
991 pos = qd2offset(qd);
992 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
993 if (error < 0)
994 return error;
995
996 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
997 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
998 qlvb->__pad = 0;
999 qlvb->qb_limit = q.qu_limit;
1000 qlvb->qb_warn = q.qu_warn;
1001 qlvb->qb_value = q.qu_value;
1002 qd->qd_qb = *qlvb;
1003
1004 return 0;
1005}
1006
1007static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
1008 struct gfs2_holder *q_gh)
1009{
1010 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1011 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1012 struct gfs2_holder i_gh;
1013 int error;
1014
1015restart:
1016 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
1017 if (error)
1018 return error;
1019
1020 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1021 force_refresh = FORCE;
1022
1023 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1024
1025 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1026 gfs2_glock_dq_uninit(q_gh);
1027 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1028 GL_NOCACHE, q_gh);
1029 if (error)
1030 return error;
1031
1032 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1033 if (error)
1034 goto fail;
1035
1036 error = update_qd(sdp, qd);
1037 if (error)
1038 goto fail_gunlock;
1039
1040 gfs2_glock_dq_uninit(&i_gh);
1041 gfs2_glock_dq_uninit(q_gh);
1042 force_refresh = 0;
1043 goto restart;
1044 }
1045
1046 return 0;
1047
1048fail_gunlock:
1049 gfs2_glock_dq_uninit(&i_gh);
1050fail:
1051 gfs2_glock_dq_uninit(q_gh);
1052 return error;
1053}
1054
1055int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1056{
1057 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1058 struct gfs2_quota_data *qd;
1059 u32 x;
1060 int error = 0;
1061
1062 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1063 return 0;
1064
1065 error = gfs2_quota_hold(ip, uid, gid);
1066 if (error)
1067 return error;
1068
1069 sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1070 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1071
1072 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1073 qd = ip->i_qadata->qa_qd[x];
1074 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1075 if (error)
1076 break;
1077 }
1078
1079 if (!error)
1080 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1081 else {
1082 while (x--)
1083 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1084 gfs2_quota_unhold(ip);
1085 }
1086
1087 return error;
1088}
1089
1090static int need_sync(struct gfs2_quota_data *qd)
1091{
1092 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1093 struct gfs2_tune *gt = &sdp->sd_tune;
1094 s64 value;
1095 unsigned int num, den;
1096 int do_sync = 1;
1097
1098 if (!qd->qd_qb.qb_limit)
1099 return 0;
1100
1101 spin_lock(&qd_lock);
1102 value = qd->qd_change;
1103 spin_unlock(&qd_lock);
1104
1105 spin_lock(>->gt_spin);
1106 num = gt->gt_quota_scale_num;
1107 den = gt->gt_quota_scale_den;
1108 spin_unlock(>->gt_spin);
1109
1110 if (value < 0)
1111 do_sync = 0;
1112 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1113 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1114 do_sync = 0;
1115 else {
1116 value *= gfs2_jindex_size(sdp) * num;
1117 value = div_s64(value, den);
1118 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1119 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1120 do_sync = 0;
1121 }
1122
1123 return do_sync;
1124}
1125
1126void gfs2_quota_unlock(struct gfs2_inode *ip)
1127{
1128 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1129 struct gfs2_quota_data *qda[4];
1130 unsigned int count = 0;
1131 u32 x;
1132 int found;
1133
1134 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1135 return;
1136
1137 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1138 struct gfs2_quota_data *qd;
1139 int sync;
1140
1141 qd = ip->i_qadata->qa_qd[x];
1142 sync = need_sync(qd);
1143
1144 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1145 if (!sync)
1146 continue;
1147
1148 spin_lock(&qd_lock);
1149 found = qd_check_sync(sdp, qd, NULL);
1150 spin_unlock(&qd_lock);
1151
1152 if (!found)
1153 continue;
1154
1155 gfs2_assert_warn(sdp, qd->qd_change_sync);
1156 if (bh_get(qd)) {
1157 clear_bit(QDF_LOCKED, &qd->qd_flags);
1158 slot_put(qd);
1159 qd_put(qd);
1160 continue;
1161 }
1162
1163 qda[count++] = qd;
1164 }
1165
1166 if (count) {
1167 do_sync(count, qda);
1168 for (x = 0; x < count; x++)
1169 qd_unlock(qda[x]);
1170 }
1171
1172 gfs2_quota_unhold(ip);
1173}
1174
1175#define MAX_LINE 256
1176
1177static int print_message(struct gfs2_quota_data *qd, char *type)
1178{
1179 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1180
1181 fs_info(sdp, "quota %s for %s %u\n",
1182 type,
1183 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1184 from_kqid(&init_user_ns, qd->qd_id));
1185
1186 return 0;
1187}
1188
1189/**
1190 * gfs2_quota_check - check if allocating new blocks will exceed quota
1191 * @ip: The inode for which this check is being performed
1192 * @uid: The uid to check against
1193 * @gid: The gid to check against
1194 * @ap: The allocation parameters. ap->target contains the requested
1195 * blocks. ap->min_target, if set, contains the minimum blks
1196 * requested.
1197 *
1198 * Returns: 0 on success.
1199 * min_req = ap->min_target ? ap->min_target : ap->target;
1200 * quota must allow at least min_req blks for success and
1201 * ap->allowed is set to the number of blocks allowed
1202 *
1203 * -EDQUOT otherwise, quota violation. ap->allowed is set to number
1204 * of blocks available.
1205 */
1206int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1207 struct gfs2_alloc_parms *ap)
1208{
1209 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1210 struct gfs2_quota_data *qd;
1211 s64 value, warn, limit;
1212 u32 x;
1213 int error = 0;
1214
1215 ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1216 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1217 return 0;
1218
1219 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1220 qd = ip->i_qadata->qa_qd[x];
1221
1222 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1223 qid_eq(qd->qd_id, make_kqid_gid(gid))))
1224 continue;
1225
1226 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1227 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1228 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1229 spin_lock(&qd_lock);
1230 value += qd->qd_change;
1231 spin_unlock(&qd_lock);
1232
1233 if (limit > 0 && (limit - value) < ap->allowed)
1234 ap->allowed = limit - value;
1235 /* If we can't meet the target */
1236 if (limit && limit < (value + (s64)ap->target)) {
1237 /* If no min_target specified or we don't meet
1238 * min_target, return -EDQUOT */
1239 if (!ap->min_target || ap->min_target > ap->allowed) {
1240 if (!test_and_set_bit(QDF_QMSG_QUIET,
1241 &qd->qd_flags)) {
1242 print_message(qd, "exceeded");
1243 quota_send_warning(qd->qd_id,
1244 sdp->sd_vfs->s_dev,
1245 QUOTA_NL_BHARDWARN);
1246 }
1247 error = -EDQUOT;
1248 break;
1249 }
1250 } else if (warn && warn < value &&
1251 time_after_eq(jiffies, qd->qd_last_warn +
1252 gfs2_tune_get(sdp, gt_quota_warn_period)
1253 * HZ)) {
1254 quota_send_warning(qd->qd_id,
1255 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1256 error = print_message(qd, "warning");
1257 qd->qd_last_warn = jiffies;
1258 }
1259 }
1260 return error;
1261}
1262
1263void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1264 kuid_t uid, kgid_t gid)
1265{
1266 struct gfs2_quota_data *qd;
1267 u32 x;
1268 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1269
1270 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON ||
1271 gfs2_assert_warn(sdp, change))
1272 return;
1273 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1274 return;
1275
1276 if (gfs2_assert_withdraw(sdp, ip->i_qadata &&
1277 ip->i_qadata->qa_ref > 0))
1278 return;
1279 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1280 qd = ip->i_qadata->qa_qd[x];
1281
1282 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1283 qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1284 do_qc(qd, change);
1285 }
1286 }
1287}
1288
1289int gfs2_quota_sync(struct super_block *sb, int type)
1290{
1291 struct gfs2_sbd *sdp = sb->s_fs_info;
1292 struct gfs2_quota_data **qda;
1293 unsigned int max_qd = PAGE_SIZE / sizeof(struct gfs2_holder);
1294 unsigned int num_qd;
1295 unsigned int x;
1296 int error = 0;
1297
1298 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1299 if (!qda)
1300 return -ENOMEM;
1301
1302 mutex_lock(&sdp->sd_quota_sync_mutex);
1303 sdp->sd_quota_sync_gen++;
1304
1305 do {
1306 num_qd = 0;
1307
1308 for (;;) {
1309 error = qd_fish(sdp, qda + num_qd);
1310 if (error || !qda[num_qd])
1311 break;
1312 if (++num_qd == max_qd)
1313 break;
1314 }
1315
1316 if (num_qd) {
1317 if (!error)
1318 error = do_sync(num_qd, qda);
1319 if (!error)
1320 for (x = 0; x < num_qd; x++)
1321 qda[x]->qd_sync_gen =
1322 sdp->sd_quota_sync_gen;
1323
1324 for (x = 0; x < num_qd; x++)
1325 qd_unlock(qda[x]);
1326 }
1327 } while (!error && num_qd == max_qd);
1328
1329 mutex_unlock(&sdp->sd_quota_sync_mutex);
1330 kfree(qda);
1331
1332 return error;
1333}
1334
1335int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1336{
1337 struct gfs2_quota_data *qd;
1338 struct gfs2_holder q_gh;
1339 int error;
1340
1341 error = qd_get(sdp, qid, &qd);
1342 if (error)
1343 return error;
1344
1345 error = do_glock(qd, FORCE, &q_gh);
1346 if (!error)
1347 gfs2_glock_dq_uninit(&q_gh);
1348
1349 qd_put(qd);
1350 return error;
1351}
1352
1353int gfs2_quota_init(struct gfs2_sbd *sdp)
1354{
1355 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1356 u64 size = i_size_read(sdp->sd_qc_inode);
1357 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1358 unsigned int x, slot = 0;
1359 unsigned int found = 0;
1360 unsigned int hash;
1361 unsigned int bm_size;
1362 u64 dblock;
1363 u32 extlen = 0;
1364 int error;
1365
1366 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1367 return -EIO;
1368
1369 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1370 bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1371 bm_size *= sizeof(unsigned long);
1372 error = -ENOMEM;
1373 sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1374 if (sdp->sd_quota_bitmap == NULL)
1375 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1376 __GFP_ZERO);
1377 if (!sdp->sd_quota_bitmap)
1378 return error;
1379
1380 for (x = 0; x < blocks; x++) {
1381 struct buffer_head *bh;
1382 const struct gfs2_quota_change *qc;
1383 unsigned int y;
1384
1385 if (!extlen) {
1386 extlen = 32;
1387 error = gfs2_get_extent(&ip->i_inode, x, &dblock, &extlen);
1388 if (error)
1389 goto fail;
1390 }
1391 error = -EIO;
1392 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1393 if (!bh)
1394 goto fail;
1395 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1396 brelse(bh);
1397 goto fail;
1398 }
1399
1400 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1401 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1402 y++, slot++) {
1403 struct gfs2_quota_data *qd;
1404 s64 qc_change = be64_to_cpu(qc->qc_change);
1405 u32 qc_flags = be32_to_cpu(qc->qc_flags);
1406 enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1407 USRQUOTA : GRPQUOTA;
1408 struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1409 be32_to_cpu(qc->qc_id));
1410 qc++;
1411 if (!qc_change)
1412 continue;
1413
1414 hash = gfs2_qd_hash(sdp, qc_id);
1415 qd = qd_alloc(hash, sdp, qc_id);
1416 if (qd == NULL) {
1417 brelse(bh);
1418 goto fail;
1419 }
1420
1421 set_bit(QDF_CHANGE, &qd->qd_flags);
1422 qd->qd_change = qc_change;
1423 qd->qd_slot = slot;
1424 qd->qd_slot_count = 1;
1425
1426 spin_lock(&qd_lock);
1427 BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1428 list_add(&qd->qd_list, &sdp->sd_quota_list);
1429 atomic_inc(&sdp->sd_quota_count);
1430 spin_unlock(&qd_lock);
1431
1432 spin_lock_bucket(hash);
1433 hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1434 spin_unlock_bucket(hash);
1435
1436 found++;
1437 }
1438
1439 brelse(bh);
1440 dblock++;
1441 extlen--;
1442 }
1443
1444 if (found)
1445 fs_info(sdp, "found %u quota changes\n", found);
1446
1447 return 0;
1448
1449fail:
1450 gfs2_quota_cleanup(sdp);
1451 return error;
1452}
1453
1454void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1455{
1456 struct list_head *head = &sdp->sd_quota_list;
1457 struct gfs2_quota_data *qd;
1458
1459 spin_lock(&qd_lock);
1460 while (!list_empty(head)) {
1461 qd = list_last_entry(head, struct gfs2_quota_data, qd_list);
1462
1463 list_del(&qd->qd_list);
1464
1465 /* Also remove if this qd exists in the reclaim list */
1466 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1467 atomic_dec(&sdp->sd_quota_count);
1468 spin_unlock(&qd_lock);
1469
1470 spin_lock_bucket(qd->qd_hash);
1471 hlist_bl_del_rcu(&qd->qd_hlist);
1472 spin_unlock_bucket(qd->qd_hash);
1473
1474 gfs2_assert_warn(sdp, !qd->qd_change);
1475 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1476 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1477
1478 gfs2_glock_put(qd->qd_gl);
1479 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1480
1481 spin_lock(&qd_lock);
1482 }
1483 spin_unlock(&qd_lock);
1484
1485 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1486
1487 kvfree(sdp->sd_quota_bitmap);
1488 sdp->sd_quota_bitmap = NULL;
1489}
1490
1491static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1492{
1493 if (error == 0 || error == -EROFS)
1494 return;
1495 if (!gfs2_withdrawn(sdp)) {
1496 if (!cmpxchg(&sdp->sd_log_error, 0, error))
1497 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1498 wake_up(&sdp->sd_logd_waitq);
1499 }
1500}
1501
1502static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1503 int (*fxn)(struct super_block *sb, int type),
1504 unsigned long t, unsigned long *timeo,
1505 unsigned int *new_timeo)
1506{
1507 if (t >= *timeo) {
1508 int error = fxn(sdp->sd_vfs, 0);
1509 quotad_error(sdp, msg, error);
1510 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1511 } else {
1512 *timeo -= t;
1513 }
1514}
1515
1516void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1517 if (!sdp->sd_statfs_force_sync) {
1518 sdp->sd_statfs_force_sync = 1;
1519 wake_up(&sdp->sd_quota_wait);
1520 }
1521}
1522
1523
1524/**
1525 * gfs2_quotad - Write cached quota changes into the quota file
1526 * @data: Pointer to GFS2 superblock
1527 *
1528 */
1529
1530int gfs2_quotad(void *data)
1531{
1532 struct gfs2_sbd *sdp = data;
1533 struct gfs2_tune *tune = &sdp->sd_tune;
1534 unsigned long statfs_timeo = 0;
1535 unsigned long quotad_timeo = 0;
1536 unsigned long t = 0;
1537 DEFINE_WAIT(wait);
1538
1539 while (!kthread_should_stop()) {
1540
1541 if (gfs2_withdrawn(sdp))
1542 goto bypass;
1543 /* Update the master statfs file */
1544 if (sdp->sd_statfs_force_sync) {
1545 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1546 quotad_error(sdp, "statfs", error);
1547 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1548 }
1549 else
1550 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1551 &statfs_timeo,
1552 &tune->gt_statfs_quantum);
1553
1554 /* Update quota file */
1555 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1556 "ad_timeo, &tune->gt_quota_quantum);
1557
1558 try_to_freeze();
1559
1560bypass:
1561 t = min(quotad_timeo, statfs_timeo);
1562
1563 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1564 if (!sdp->sd_statfs_force_sync)
1565 t -= schedule_timeout(t);
1566 else
1567 t = 0;
1568 finish_wait(&sdp->sd_quota_wait, &wait);
1569 }
1570
1571 return 0;
1572}
1573
1574static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1575{
1576 struct gfs2_sbd *sdp = sb->s_fs_info;
1577
1578 memset(state, 0, sizeof(*state));
1579
1580 switch (sdp->sd_args.ar_quota) {
1581 case GFS2_QUOTA_ON:
1582 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1583 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1584 fallthrough;
1585 case GFS2_QUOTA_ACCOUNT:
1586 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1587 QCI_SYSFILE;
1588 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1589 QCI_SYSFILE;
1590 break;
1591 case GFS2_QUOTA_OFF:
1592 break;
1593 }
1594 if (sdp->sd_quota_inode) {
1595 state->s_state[USRQUOTA].ino =
1596 GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1597 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1598 }
1599 state->s_state[USRQUOTA].nextents = 1; /* unsupported */
1600 state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1601 state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1602 return 0;
1603}
1604
1605static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1606 struct qc_dqblk *fdq)
1607{
1608 struct gfs2_sbd *sdp = sb->s_fs_info;
1609 struct gfs2_quota_lvb *qlvb;
1610 struct gfs2_quota_data *qd;
1611 struct gfs2_holder q_gh;
1612 int error;
1613
1614 memset(fdq, 0, sizeof(*fdq));
1615
1616 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1617 return -ESRCH; /* Crazy XFS error code */
1618
1619 if ((qid.type != USRQUOTA) &&
1620 (qid.type != GRPQUOTA))
1621 return -EINVAL;
1622
1623 error = qd_get(sdp, qid, &qd);
1624 if (error)
1625 return error;
1626 error = do_glock(qd, FORCE, &q_gh);
1627 if (error)
1628 goto out;
1629
1630 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1631 fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1632 fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1633 fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1634
1635 gfs2_glock_dq_uninit(&q_gh);
1636out:
1637 qd_put(qd);
1638 return error;
1639}
1640
1641/* GFS2 only supports a subset of the XFS fields */
1642#define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1643
1644static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1645 struct qc_dqblk *fdq)
1646{
1647 struct gfs2_sbd *sdp = sb->s_fs_info;
1648 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1649 struct gfs2_quota_data *qd;
1650 struct gfs2_holder q_gh, i_gh;
1651 unsigned int data_blocks, ind_blocks;
1652 unsigned int blocks = 0;
1653 int alloc_required;
1654 loff_t offset;
1655 int error;
1656
1657 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1658 return -ESRCH; /* Crazy XFS error code */
1659
1660 if ((qid.type != USRQUOTA) &&
1661 (qid.type != GRPQUOTA))
1662 return -EINVAL;
1663
1664 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1665 return -EINVAL;
1666
1667 error = qd_get(sdp, qid, &qd);
1668 if (error)
1669 return error;
1670
1671 error = gfs2_qa_get(ip);
1672 if (error)
1673 goto out_put;
1674
1675 inode_lock(&ip->i_inode);
1676 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1677 if (error)
1678 goto out_unlockput;
1679 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1680 if (error)
1681 goto out_q;
1682
1683 /* Check for existing entry, if none then alloc new blocks */
1684 error = update_qd(sdp, qd);
1685 if (error)
1686 goto out_i;
1687
1688 /* If nothing has changed, this is a no-op */
1689 if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1690 ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1691 fdq->d_fieldmask ^= QC_SPC_SOFT;
1692
1693 if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1694 ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1695 fdq->d_fieldmask ^= QC_SPC_HARD;
1696
1697 if ((fdq->d_fieldmask & QC_SPACE) &&
1698 ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1699 fdq->d_fieldmask ^= QC_SPACE;
1700
1701 if (fdq->d_fieldmask == 0)
1702 goto out_i;
1703
1704 offset = qd2offset(qd);
1705 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1706 if (gfs2_is_stuffed(ip))
1707 alloc_required = 1;
1708 if (alloc_required) {
1709 struct gfs2_alloc_parms ap = { .aflags = 0, };
1710 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1711 &data_blocks, &ind_blocks);
1712 blocks = 1 + data_blocks + ind_blocks;
1713 ap.target = blocks;
1714 error = gfs2_inplace_reserve(ip, &ap);
1715 if (error)
1716 goto out_i;
1717 blocks += gfs2_rg_blocks(ip, blocks);
1718 }
1719
1720 /* Some quotas span block boundaries and can update two blocks,
1721 adding an extra block to the transaction to handle such quotas */
1722 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1723 if (error)
1724 goto out_release;
1725
1726 /* Apply changes */
1727 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1728 if (!error)
1729 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1730
1731 gfs2_trans_end(sdp);
1732out_release:
1733 if (alloc_required)
1734 gfs2_inplace_release(ip);
1735out_i:
1736 gfs2_glock_dq_uninit(&i_gh);
1737out_q:
1738 gfs2_glock_dq_uninit(&q_gh);
1739out_unlockput:
1740 gfs2_qa_put(ip);
1741 inode_unlock(&ip->i_inode);
1742out_put:
1743 qd_put(qd);
1744 return error;
1745}
1746
1747const struct quotactl_ops gfs2_quotactl_ops = {
1748 .quota_sync = gfs2_quota_sync,
1749 .get_state = gfs2_quota_get_state,
1750 .get_dqblk = gfs2_get_dqblk,
1751 .set_dqblk = gfs2_set_dqblk,
1752};
1753
1754void __init gfs2_quota_hash_init(void)
1755{
1756 unsigned i;
1757
1758 for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1759 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1760}
1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10/*
11 * Quota change tags are associated with each transaction that allocates or
12 * deallocates space. Those changes are accumulated locally to each node (in a
13 * per-node file) and then are periodically synced to the quota file. This
14 * avoids the bottleneck of constantly touching the quota file, but introduces
15 * fuzziness in the current usage value of IDs that are being used on different
16 * nodes in the cluster simultaneously. So, it is possible for a user on
17 * multiple nodes to overrun their quota, but that overrun is controlable.
18 * Since quota tags are part of transactions, there is no need for a quota check
19 * program to be run on node crashes or anything like that.
20 *
21 * There are couple of knobs that let the administrator manage the quota
22 * fuzziness. "quota_quantum" sets the maximum time a quota change can be
23 * sitting on one node before being synced to the quota file. (The default is
24 * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency
25 * of quota file syncs increases as the user moves closer to their limit. The
26 * more frequent the syncs, the more accurate the quota enforcement, but that
27 * means that there is more contention between the nodes for the quota file.
28 * The default value is one. This sets the maximum theoretical quota overrun
29 * (with infinite node with infinite bandwidth) to twice the user's limit. (In
30 * practice, the maximum overrun you see should be much less.) A "quota_scale"
31 * number greater than one makes quota syncs more frequent and reduces the
32 * maximum overrun. Numbers less than one (but greater than zero) make quota
33 * syncs less frequent.
34 *
35 * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
36 * the quota file, so it is not being constantly read.
37 */
38
39#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
40
41#include <linux/sched.h>
42#include <linux/slab.h>
43#include <linux/mm.h>
44#include <linux/spinlock.h>
45#include <linux/completion.h>
46#include <linux/buffer_head.h>
47#include <linux/sort.h>
48#include <linux/fs.h>
49#include <linux/bio.h>
50#include <linux/gfs2_ondisk.h>
51#include <linux/kthread.h>
52#include <linux/freezer.h>
53#include <linux/quota.h>
54#include <linux/dqblk_xfs.h>
55#include <linux/lockref.h>
56#include <linux/list_lru.h>
57#include <linux/rcupdate.h>
58#include <linux/rculist_bl.h>
59#include <linux/bit_spinlock.h>
60#include <linux/jhash.h>
61#include <linux/vmalloc.h>
62
63#include "gfs2.h"
64#include "incore.h"
65#include "bmap.h"
66#include "glock.h"
67#include "glops.h"
68#include "log.h"
69#include "meta_io.h"
70#include "quota.h"
71#include "rgrp.h"
72#include "super.h"
73#include "trans.h"
74#include "inode.h"
75#include "util.h"
76
77#define GFS2_QD_HASH_SHIFT 12
78#define GFS2_QD_HASH_SIZE (1 << GFS2_QD_HASH_SHIFT)
79#define GFS2_QD_HASH_MASK (GFS2_QD_HASH_SIZE - 1)
80
81/* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */
82/* -> sd_bitmap_lock */
83static DEFINE_SPINLOCK(qd_lock);
84struct list_lru gfs2_qd_lru;
85
86static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
87
88static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
89 const struct kqid qid)
90{
91 unsigned int h;
92
93 h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
94 h = jhash(&qid, sizeof(struct kqid), h);
95
96 return h & GFS2_QD_HASH_MASK;
97}
98
99static inline void spin_lock_bucket(unsigned int hash)
100{
101 hlist_bl_lock(&qd_hash_table[hash]);
102}
103
104static inline void spin_unlock_bucket(unsigned int hash)
105{
106 hlist_bl_unlock(&qd_hash_table[hash]);
107}
108
109static void gfs2_qd_dealloc(struct rcu_head *rcu)
110{
111 struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
112 kmem_cache_free(gfs2_quotad_cachep, qd);
113}
114
115static void gfs2_qd_dispose(struct list_head *list)
116{
117 struct gfs2_quota_data *qd;
118 struct gfs2_sbd *sdp;
119
120 while (!list_empty(list)) {
121 qd = list_entry(list->next, struct gfs2_quota_data, qd_lru);
122 sdp = qd->qd_gl->gl_sbd;
123
124 list_del(&qd->qd_lru);
125
126 /* Free from the filesystem-specific list */
127 spin_lock(&qd_lock);
128 list_del(&qd->qd_list);
129 spin_unlock(&qd_lock);
130
131 spin_lock_bucket(qd->qd_hash);
132 hlist_bl_del_rcu(&qd->qd_hlist);
133 spin_unlock_bucket(qd->qd_hash);
134
135 gfs2_assert_warn(sdp, !qd->qd_change);
136 gfs2_assert_warn(sdp, !qd->qd_slot_count);
137 gfs2_assert_warn(sdp, !qd->qd_bh_count);
138
139 gfs2_glock_put(qd->qd_gl);
140 atomic_dec(&sdp->sd_quota_count);
141
142 /* Delete it from the common reclaim list */
143 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
144 }
145}
146
147
148static enum lru_status gfs2_qd_isolate(struct list_head *item, spinlock_t *lock, void *arg)
149{
150 struct list_head *dispose = arg;
151 struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
152
153 if (!spin_trylock(&qd->qd_lockref.lock))
154 return LRU_SKIP;
155
156 if (qd->qd_lockref.count == 0) {
157 lockref_mark_dead(&qd->qd_lockref);
158 list_move(&qd->qd_lru, dispose);
159 }
160
161 spin_unlock(&qd->qd_lockref.lock);
162 return LRU_REMOVED;
163}
164
165static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
166 struct shrink_control *sc)
167{
168 LIST_HEAD(dispose);
169 unsigned long freed;
170
171 if (!(sc->gfp_mask & __GFP_FS))
172 return SHRINK_STOP;
173
174 freed = list_lru_walk_node(&gfs2_qd_lru, sc->nid, gfs2_qd_isolate,
175 &dispose, &sc->nr_to_scan);
176
177 gfs2_qd_dispose(&dispose);
178
179 return freed;
180}
181
182static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
183 struct shrink_control *sc)
184{
185 return vfs_pressure_ratio(list_lru_count_node(&gfs2_qd_lru, sc->nid));
186}
187
188struct shrinker gfs2_qd_shrinker = {
189 .count_objects = gfs2_qd_shrink_count,
190 .scan_objects = gfs2_qd_shrink_scan,
191 .seeks = DEFAULT_SEEKS,
192 .flags = SHRINKER_NUMA_AWARE,
193};
194
195
196static u64 qd2index(struct gfs2_quota_data *qd)
197{
198 struct kqid qid = qd->qd_id;
199 return (2 * (u64)from_kqid(&init_user_ns, qid)) +
200 ((qid.type == USRQUOTA) ? 0 : 1);
201}
202
203static u64 qd2offset(struct gfs2_quota_data *qd)
204{
205 u64 offset;
206
207 offset = qd2index(qd);
208 offset *= sizeof(struct gfs2_quota);
209
210 return offset;
211}
212
213static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
214{
215 struct gfs2_quota_data *qd;
216 int error;
217
218 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
219 if (!qd)
220 return NULL;
221
222 qd->qd_sbd = sdp;
223 qd->qd_lockref.count = 1;
224 spin_lock_init(&qd->qd_lockref.lock);
225 qd->qd_id = qid;
226 qd->qd_slot = -1;
227 INIT_LIST_HEAD(&qd->qd_lru);
228 qd->qd_hash = hash;
229
230 error = gfs2_glock_get(sdp, qd2index(qd),
231 &gfs2_quota_glops, CREATE, &qd->qd_gl);
232 if (error)
233 goto fail;
234
235 return qd;
236
237fail:
238 kmem_cache_free(gfs2_quotad_cachep, qd);
239 return NULL;
240}
241
242static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
243 const struct gfs2_sbd *sdp,
244 struct kqid qid)
245{
246 struct gfs2_quota_data *qd;
247 struct hlist_bl_node *h;
248
249 hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
250 if (!qid_eq(qd->qd_id, qid))
251 continue;
252 if (qd->qd_sbd != sdp)
253 continue;
254 if (lockref_get_not_dead(&qd->qd_lockref)) {
255 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
256 return qd;
257 }
258 }
259
260 return NULL;
261}
262
263
264static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
265 struct gfs2_quota_data **qdp)
266{
267 struct gfs2_quota_data *qd, *new_qd;
268 unsigned int hash = gfs2_qd_hash(sdp, qid);
269
270 rcu_read_lock();
271 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
272 rcu_read_unlock();
273
274 if (qd)
275 return 0;
276
277 new_qd = qd_alloc(hash, sdp, qid);
278 if (!new_qd)
279 return -ENOMEM;
280
281 spin_lock(&qd_lock);
282 spin_lock_bucket(hash);
283 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
284 if (qd == NULL) {
285 *qdp = new_qd;
286 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
287 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
288 atomic_inc(&sdp->sd_quota_count);
289 }
290 spin_unlock_bucket(hash);
291 spin_unlock(&qd_lock);
292
293 if (qd) {
294 gfs2_glock_put(new_qd->qd_gl);
295 kmem_cache_free(gfs2_quotad_cachep, new_qd);
296 }
297
298 return 0;
299}
300
301
302static void qd_hold(struct gfs2_quota_data *qd)
303{
304 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
305 gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
306 lockref_get(&qd->qd_lockref);
307}
308
309static void qd_put(struct gfs2_quota_data *qd)
310{
311 if (lockref_put_or_lock(&qd->qd_lockref))
312 return;
313
314 qd->qd_lockref.count = 0;
315 list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
316 spin_unlock(&qd->qd_lockref.lock);
317
318}
319
320static int slot_get(struct gfs2_quota_data *qd)
321{
322 struct gfs2_sbd *sdp = qd->qd_sbd;
323 unsigned int bit;
324 int error = 0;
325
326 spin_lock(&sdp->sd_bitmap_lock);
327 if (qd->qd_slot_count != 0)
328 goto out;
329
330 error = -ENOSPC;
331 bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
332 if (bit < sdp->sd_quota_slots) {
333 set_bit(bit, sdp->sd_quota_bitmap);
334 qd->qd_slot = bit;
335 error = 0;
336out:
337 qd->qd_slot_count++;
338 }
339 spin_unlock(&sdp->sd_bitmap_lock);
340
341 return error;
342}
343
344static void slot_hold(struct gfs2_quota_data *qd)
345{
346 struct gfs2_sbd *sdp = qd->qd_sbd;
347
348 spin_lock(&sdp->sd_bitmap_lock);
349 gfs2_assert(sdp, qd->qd_slot_count);
350 qd->qd_slot_count++;
351 spin_unlock(&sdp->sd_bitmap_lock);
352}
353
354static void slot_put(struct gfs2_quota_data *qd)
355{
356 struct gfs2_sbd *sdp = qd->qd_sbd;
357
358 spin_lock(&sdp->sd_bitmap_lock);
359 gfs2_assert(sdp, qd->qd_slot_count);
360 if (!--qd->qd_slot_count) {
361 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
362 qd->qd_slot = -1;
363 }
364 spin_unlock(&sdp->sd_bitmap_lock);
365}
366
367static int bh_get(struct gfs2_quota_data *qd)
368{
369 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
370 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
371 unsigned int block, offset;
372 struct buffer_head *bh;
373 int error;
374 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
375
376 mutex_lock(&sdp->sd_quota_mutex);
377
378 if (qd->qd_bh_count++) {
379 mutex_unlock(&sdp->sd_quota_mutex);
380 return 0;
381 }
382
383 block = qd->qd_slot / sdp->sd_qc_per_block;
384 offset = qd->qd_slot % sdp->sd_qc_per_block;
385
386 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
387 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
388 if (error)
389 goto fail;
390 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
391 if (error)
392 goto fail;
393 error = -EIO;
394 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
395 goto fail_brelse;
396
397 qd->qd_bh = bh;
398 qd->qd_bh_qc = (struct gfs2_quota_change *)
399 (bh->b_data + sizeof(struct gfs2_meta_header) +
400 offset * sizeof(struct gfs2_quota_change));
401
402 mutex_unlock(&sdp->sd_quota_mutex);
403
404 return 0;
405
406fail_brelse:
407 brelse(bh);
408fail:
409 qd->qd_bh_count--;
410 mutex_unlock(&sdp->sd_quota_mutex);
411 return error;
412}
413
414static void bh_put(struct gfs2_quota_data *qd)
415{
416 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
417
418 mutex_lock(&sdp->sd_quota_mutex);
419 gfs2_assert(sdp, qd->qd_bh_count);
420 if (!--qd->qd_bh_count) {
421 brelse(qd->qd_bh);
422 qd->qd_bh = NULL;
423 qd->qd_bh_qc = NULL;
424 }
425 mutex_unlock(&sdp->sd_quota_mutex);
426}
427
428static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
429 u64 *sync_gen)
430{
431 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
432 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
433 (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
434 return 0;
435
436 if (!lockref_get_not_dead(&qd->qd_lockref))
437 return 0;
438
439 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
440 set_bit(QDF_LOCKED, &qd->qd_flags);
441 qd->qd_change_sync = qd->qd_change;
442 slot_hold(qd);
443 return 1;
444}
445
446static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
447{
448 struct gfs2_quota_data *qd = NULL;
449 int error;
450 int found = 0;
451
452 *qdp = NULL;
453
454 if (sdp->sd_vfs->s_flags & MS_RDONLY)
455 return 0;
456
457 spin_lock(&qd_lock);
458
459 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
460 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
461 if (found)
462 break;
463 }
464
465 if (!found)
466 qd = NULL;
467
468 spin_unlock(&qd_lock);
469
470 if (qd) {
471 gfs2_assert_warn(sdp, qd->qd_change_sync);
472 error = bh_get(qd);
473 if (error) {
474 clear_bit(QDF_LOCKED, &qd->qd_flags);
475 slot_put(qd);
476 qd_put(qd);
477 return error;
478 }
479 }
480
481 *qdp = qd;
482
483 return 0;
484}
485
486static void qd_unlock(struct gfs2_quota_data *qd)
487{
488 gfs2_assert_warn(qd->qd_gl->gl_sbd,
489 test_bit(QDF_LOCKED, &qd->qd_flags));
490 clear_bit(QDF_LOCKED, &qd->qd_flags);
491 bh_put(qd);
492 slot_put(qd);
493 qd_put(qd);
494}
495
496static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
497 struct gfs2_quota_data **qdp)
498{
499 int error;
500
501 error = qd_get(sdp, qid, qdp);
502 if (error)
503 return error;
504
505 error = slot_get(*qdp);
506 if (error)
507 goto fail;
508
509 error = bh_get(*qdp);
510 if (error)
511 goto fail_slot;
512
513 return 0;
514
515fail_slot:
516 slot_put(*qdp);
517fail:
518 qd_put(*qdp);
519 return error;
520}
521
522static void qdsb_put(struct gfs2_quota_data *qd)
523{
524 bh_put(qd);
525 slot_put(qd);
526 qd_put(qd);
527}
528
529int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
530{
531 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
532 struct gfs2_quota_data **qd;
533 int error;
534
535 if (ip->i_res == NULL) {
536 error = gfs2_rs_alloc(ip);
537 if (error)
538 return error;
539 }
540
541 qd = ip->i_res->rs_qa_qd;
542
543 if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
544 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
545 return -EIO;
546
547 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
548 return 0;
549
550 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
551 if (error)
552 goto out;
553 ip->i_res->rs_qa_qd_num++;
554 qd++;
555
556 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
557 if (error)
558 goto out;
559 ip->i_res->rs_qa_qd_num++;
560 qd++;
561
562 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
563 !uid_eq(uid, ip->i_inode.i_uid)) {
564 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
565 if (error)
566 goto out;
567 ip->i_res->rs_qa_qd_num++;
568 qd++;
569 }
570
571 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
572 !gid_eq(gid, ip->i_inode.i_gid)) {
573 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
574 if (error)
575 goto out;
576 ip->i_res->rs_qa_qd_num++;
577 qd++;
578 }
579
580out:
581 if (error)
582 gfs2_quota_unhold(ip);
583 return error;
584}
585
586void gfs2_quota_unhold(struct gfs2_inode *ip)
587{
588 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
589 unsigned int x;
590
591 if (ip->i_res == NULL)
592 return;
593 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
594
595 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
596 qdsb_put(ip->i_res->rs_qa_qd[x]);
597 ip->i_res->rs_qa_qd[x] = NULL;
598 }
599 ip->i_res->rs_qa_qd_num = 0;
600}
601
602static int sort_qd(const void *a, const void *b)
603{
604 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
605 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
606
607 if (qid_lt(qd_a->qd_id, qd_b->qd_id))
608 return -1;
609 if (qid_lt(qd_b->qd_id, qd_a->qd_id))
610 return 1;
611 return 0;
612}
613
614static void do_qc(struct gfs2_quota_data *qd, s64 change)
615{
616 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
617 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
618 struct gfs2_quota_change *qc = qd->qd_bh_qc;
619 s64 x;
620
621 mutex_lock(&sdp->sd_quota_mutex);
622 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
623
624 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
625 qc->qc_change = 0;
626 qc->qc_flags = 0;
627 if (qd->qd_id.type == USRQUOTA)
628 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
629 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
630 }
631
632 x = be64_to_cpu(qc->qc_change) + change;
633 qc->qc_change = cpu_to_be64(x);
634
635 spin_lock(&qd_lock);
636 qd->qd_change = x;
637 spin_unlock(&qd_lock);
638
639 if (!x) {
640 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
641 clear_bit(QDF_CHANGE, &qd->qd_flags);
642 qc->qc_flags = 0;
643 qc->qc_id = 0;
644 slot_put(qd);
645 qd_put(qd);
646 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
647 qd_hold(qd);
648 slot_hold(qd);
649 }
650
651 mutex_unlock(&sdp->sd_quota_mutex);
652}
653
654/**
655 * gfs2_adjust_quota - adjust record of current block usage
656 * @ip: The quota inode
657 * @loc: Offset of the entry in the quota file
658 * @change: The amount of usage change to record
659 * @qd: The quota data
660 * @fdq: The updated limits to record
661 *
662 * This function was mostly borrowed from gfs2_block_truncate_page which was
663 * in turn mostly borrowed from ext3
664 *
665 * Returns: 0 or -ve on error
666 */
667
668static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
669 s64 change, struct gfs2_quota_data *qd,
670 struct fs_disk_quota *fdq)
671{
672 struct inode *inode = &ip->i_inode;
673 struct gfs2_sbd *sdp = GFS2_SB(inode);
674 struct address_space *mapping = inode->i_mapping;
675 unsigned long index = loc >> PAGE_CACHE_SHIFT;
676 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
677 unsigned blocksize, iblock, pos;
678 struct buffer_head *bh;
679 struct page *page;
680 void *kaddr, *ptr;
681 struct gfs2_quota q;
682 int err, nbytes;
683 u64 size;
684
685 if (gfs2_is_stuffed(ip)) {
686 err = gfs2_unstuff_dinode(ip, NULL);
687 if (err)
688 return err;
689 }
690
691 memset(&q, 0, sizeof(struct gfs2_quota));
692 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
693 if (err < 0)
694 return err;
695
696 err = -EIO;
697 be64_add_cpu(&q.qu_value, change);
698 qd->qd_qb.qb_value = q.qu_value;
699 if (fdq) {
700 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
701 q.qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
702 qd->qd_qb.qb_warn = q.qu_warn;
703 }
704 if (fdq->d_fieldmask & FS_DQ_BHARD) {
705 q.qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
706 qd->qd_qb.qb_limit = q.qu_limit;
707 }
708 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
709 q.qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
710 qd->qd_qb.qb_value = q.qu_value;
711 }
712 }
713
714 /* Write the quota into the quota file on disk */
715 ptr = &q;
716 nbytes = sizeof(struct gfs2_quota);
717get_a_page:
718 page = find_or_create_page(mapping, index, GFP_NOFS);
719 if (!page)
720 return -ENOMEM;
721
722 blocksize = inode->i_sb->s_blocksize;
723 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
724
725 if (!page_has_buffers(page))
726 create_empty_buffers(page, blocksize, 0);
727
728 bh = page_buffers(page);
729 pos = blocksize;
730 while (offset >= pos) {
731 bh = bh->b_this_page;
732 iblock++;
733 pos += blocksize;
734 }
735
736 if (!buffer_mapped(bh)) {
737 gfs2_block_map(inode, iblock, bh, 1);
738 if (!buffer_mapped(bh))
739 goto unlock_out;
740 /* If it's a newly allocated disk block for quota, zero it */
741 if (buffer_new(bh))
742 zero_user(page, pos - blocksize, bh->b_size);
743 }
744
745 if (PageUptodate(page))
746 set_buffer_uptodate(bh);
747
748 if (!buffer_uptodate(bh)) {
749 ll_rw_block(READ | REQ_META, 1, &bh);
750 wait_on_buffer(bh);
751 if (!buffer_uptodate(bh))
752 goto unlock_out;
753 }
754
755 gfs2_trans_add_data(ip->i_gl, bh);
756
757 kaddr = kmap_atomic(page);
758 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
759 nbytes = PAGE_CACHE_SIZE - offset;
760 memcpy(kaddr + offset, ptr, nbytes);
761 flush_dcache_page(page);
762 kunmap_atomic(kaddr);
763 unlock_page(page);
764 page_cache_release(page);
765
766 /* If quota straddles page boundary, we need to update the rest of the
767 * quota at the beginning of the next page */
768 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
769 ptr = ptr + nbytes;
770 nbytes = sizeof(struct gfs2_quota) - nbytes;
771 offset = 0;
772 index++;
773 goto get_a_page;
774 }
775
776 size = loc + sizeof(struct gfs2_quota);
777 if (size > inode->i_size)
778 i_size_write(inode, size);
779 inode->i_mtime = inode->i_atime = CURRENT_TIME;
780 mark_inode_dirty(inode);
781 return 0;
782
783unlock_out:
784 unlock_page(page);
785 page_cache_release(page);
786 return err;
787}
788
789static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
790{
791 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
792 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
793 struct gfs2_alloc_parms ap = { .aflags = 0, };
794 unsigned int data_blocks, ind_blocks;
795 struct gfs2_holder *ghs, i_gh;
796 unsigned int qx, x;
797 struct gfs2_quota_data *qd;
798 unsigned reserved;
799 loff_t offset;
800 unsigned int nalloc = 0, blocks;
801 int error;
802
803 error = gfs2_rs_alloc(ip);
804 if (error)
805 return error;
806
807 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
808 &data_blocks, &ind_blocks);
809
810 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
811 if (!ghs)
812 return -ENOMEM;
813
814 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
815 mutex_lock(&ip->i_inode.i_mutex);
816 for (qx = 0; qx < num_qd; qx++) {
817 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
818 GL_NOCACHE, &ghs[qx]);
819 if (error)
820 goto out;
821 }
822
823 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
824 if (error)
825 goto out;
826
827 for (x = 0; x < num_qd; x++) {
828 offset = qd2offset(qda[x]);
829 if (gfs2_write_alloc_required(ip, offset,
830 sizeof(struct gfs2_quota)))
831 nalloc++;
832 }
833
834 /*
835 * 1 blk for unstuffing inode if stuffed. We add this extra
836 * block to the reservation unconditionally. If the inode
837 * doesn't need unstuffing, the block will be released to the
838 * rgrp since it won't be allocated during the transaction
839 */
840 /* +3 in the end for unstuffing block, inode size update block
841 * and another block in case quota straddles page boundary and
842 * two blocks need to be updated instead of 1 */
843 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
844
845 reserved = 1 + (nalloc * (data_blocks + ind_blocks));
846 ap.target = reserved;
847 error = gfs2_inplace_reserve(ip, &ap);
848 if (error)
849 goto out_alloc;
850
851 if (nalloc)
852 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
853
854 error = gfs2_trans_begin(sdp, blocks, 0);
855 if (error)
856 goto out_ipres;
857
858 for (x = 0; x < num_qd; x++) {
859 qd = qda[x];
860 offset = qd2offset(qd);
861 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
862 if (error)
863 goto out_end_trans;
864
865 do_qc(qd, -qd->qd_change_sync);
866 set_bit(QDF_REFRESH, &qd->qd_flags);
867 }
868
869 error = 0;
870
871out_end_trans:
872 gfs2_trans_end(sdp);
873out_ipres:
874 gfs2_inplace_release(ip);
875out_alloc:
876 gfs2_glock_dq_uninit(&i_gh);
877out:
878 while (qx--)
879 gfs2_glock_dq_uninit(&ghs[qx]);
880 mutex_unlock(&ip->i_inode.i_mutex);
881 kfree(ghs);
882 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
883 return error;
884}
885
886static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
887{
888 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
889 struct gfs2_quota q;
890 struct gfs2_quota_lvb *qlvb;
891 loff_t pos;
892 int error;
893
894 memset(&q, 0, sizeof(struct gfs2_quota));
895 pos = qd2offset(qd);
896 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
897 if (error < 0)
898 return error;
899
900 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
901 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
902 qlvb->__pad = 0;
903 qlvb->qb_limit = q.qu_limit;
904 qlvb->qb_warn = q.qu_warn;
905 qlvb->qb_value = q.qu_value;
906 qd->qd_qb = *qlvb;
907
908 return 0;
909}
910
911static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
912 struct gfs2_holder *q_gh)
913{
914 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
915 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
916 struct gfs2_holder i_gh;
917 int error;
918
919restart:
920 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
921 if (error)
922 return error;
923
924 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
925
926 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
927 gfs2_glock_dq_uninit(q_gh);
928 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
929 GL_NOCACHE, q_gh);
930 if (error)
931 return error;
932
933 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
934 if (error)
935 goto fail;
936
937 error = update_qd(sdp, qd);
938 if (error)
939 goto fail_gunlock;
940
941 gfs2_glock_dq_uninit(&i_gh);
942 gfs2_glock_dq_uninit(q_gh);
943 force_refresh = 0;
944 goto restart;
945 }
946
947 return 0;
948
949fail_gunlock:
950 gfs2_glock_dq_uninit(&i_gh);
951fail:
952 gfs2_glock_dq_uninit(q_gh);
953 return error;
954}
955
956int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
957{
958 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
959 struct gfs2_quota_data *qd;
960 unsigned int x;
961 int error = 0;
962
963 error = gfs2_quota_hold(ip, uid, gid);
964 if (error)
965 return error;
966
967 if (capable(CAP_SYS_RESOURCE) ||
968 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
969 return 0;
970
971 sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
972 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
973
974 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
975 int force = NO_FORCE;
976 qd = ip->i_res->rs_qa_qd[x];
977 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
978 force = FORCE;
979 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
980 if (error)
981 break;
982 }
983
984 if (!error)
985 set_bit(GIF_QD_LOCKED, &ip->i_flags);
986 else {
987 while (x--)
988 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
989 gfs2_quota_unhold(ip);
990 }
991
992 return error;
993}
994
995static int need_sync(struct gfs2_quota_data *qd)
996{
997 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
998 struct gfs2_tune *gt = &sdp->sd_tune;
999 s64 value;
1000 unsigned int num, den;
1001 int do_sync = 1;
1002
1003 if (!qd->qd_qb.qb_limit)
1004 return 0;
1005
1006 spin_lock(&qd_lock);
1007 value = qd->qd_change;
1008 spin_unlock(&qd_lock);
1009
1010 spin_lock(>->gt_spin);
1011 num = gt->gt_quota_scale_num;
1012 den = gt->gt_quota_scale_den;
1013 spin_unlock(>->gt_spin);
1014
1015 if (value < 0)
1016 do_sync = 0;
1017 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1018 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1019 do_sync = 0;
1020 else {
1021 value *= gfs2_jindex_size(sdp) * num;
1022 value = div_s64(value, den);
1023 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1024 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1025 do_sync = 0;
1026 }
1027
1028 return do_sync;
1029}
1030
1031void gfs2_quota_unlock(struct gfs2_inode *ip)
1032{
1033 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1034 struct gfs2_quota_data *qda[4];
1035 unsigned int count = 0;
1036 unsigned int x;
1037 int found;
1038
1039 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1040 goto out;
1041
1042 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1043 struct gfs2_quota_data *qd;
1044 int sync;
1045
1046 qd = ip->i_res->rs_qa_qd[x];
1047 sync = need_sync(qd);
1048
1049 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1050 if (!sync)
1051 continue;
1052
1053 spin_lock(&qd_lock);
1054 found = qd_check_sync(sdp, qd, NULL);
1055 spin_unlock(&qd_lock);
1056
1057 if (!found)
1058 continue;
1059
1060 gfs2_assert_warn(sdp, qd->qd_change_sync);
1061 if (bh_get(qd)) {
1062 clear_bit(QDF_LOCKED, &qd->qd_flags);
1063 slot_put(qd);
1064 qd_put(qd);
1065 continue;
1066 }
1067
1068 qda[count++] = qd;
1069 }
1070
1071 if (count) {
1072 do_sync(count, qda);
1073 for (x = 0; x < count; x++)
1074 qd_unlock(qda[x]);
1075 }
1076
1077out:
1078 gfs2_quota_unhold(ip);
1079}
1080
1081#define MAX_LINE 256
1082
1083static int print_message(struct gfs2_quota_data *qd, char *type)
1084{
1085 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1086
1087 fs_info(sdp, "quota %s for %s %u\n",
1088 type,
1089 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1090 from_kqid(&init_user_ns, qd->qd_id));
1091
1092 return 0;
1093}
1094
1095int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1096{
1097 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1098 struct gfs2_quota_data *qd;
1099 s64 value;
1100 unsigned int x;
1101 int error = 0;
1102
1103 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1104 return 0;
1105
1106 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1107 return 0;
1108
1109 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1110 qd = ip->i_res->rs_qa_qd[x];
1111
1112 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1113 qid_eq(qd->qd_id, make_kqid_gid(gid))))
1114 continue;
1115
1116 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1117 spin_lock(&qd_lock);
1118 value += qd->qd_change;
1119 spin_unlock(&qd_lock);
1120
1121 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1122 print_message(qd, "exceeded");
1123 quota_send_warning(qd->qd_id,
1124 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1125
1126 error = -EDQUOT;
1127 break;
1128 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1129 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1130 time_after_eq(jiffies, qd->qd_last_warn +
1131 gfs2_tune_get(sdp,
1132 gt_quota_warn_period) * HZ)) {
1133 quota_send_warning(qd->qd_id,
1134 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1135 error = print_message(qd, "warning");
1136 qd->qd_last_warn = jiffies;
1137 }
1138 }
1139
1140 return error;
1141}
1142
1143void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1144 kuid_t uid, kgid_t gid)
1145{
1146 struct gfs2_quota_data *qd;
1147 unsigned int x;
1148
1149 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1150 return;
1151 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1152 return;
1153
1154 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1155 qd = ip->i_res->rs_qa_qd[x];
1156
1157 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1158 qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1159 do_qc(qd, change);
1160 }
1161 }
1162}
1163
1164int gfs2_quota_sync(struct super_block *sb, int type)
1165{
1166 struct gfs2_sbd *sdp = sb->s_fs_info;
1167 struct gfs2_quota_data **qda;
1168 unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
1169 unsigned int num_qd;
1170 unsigned int x;
1171 int error = 0;
1172
1173 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1174 if (!qda)
1175 return -ENOMEM;
1176
1177 mutex_lock(&sdp->sd_quota_sync_mutex);
1178 sdp->sd_quota_sync_gen++;
1179
1180 do {
1181 num_qd = 0;
1182
1183 for (;;) {
1184 error = qd_fish(sdp, qda + num_qd);
1185 if (error || !qda[num_qd])
1186 break;
1187 if (++num_qd == max_qd)
1188 break;
1189 }
1190
1191 if (num_qd) {
1192 if (!error)
1193 error = do_sync(num_qd, qda);
1194 if (!error)
1195 for (x = 0; x < num_qd; x++)
1196 qda[x]->qd_sync_gen =
1197 sdp->sd_quota_sync_gen;
1198
1199 for (x = 0; x < num_qd; x++)
1200 qd_unlock(qda[x]);
1201 }
1202 } while (!error && num_qd == max_qd);
1203
1204 mutex_unlock(&sdp->sd_quota_sync_mutex);
1205 kfree(qda);
1206
1207 return error;
1208}
1209
1210int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1211{
1212 struct gfs2_quota_data *qd;
1213 struct gfs2_holder q_gh;
1214 int error;
1215
1216 error = qd_get(sdp, qid, &qd);
1217 if (error)
1218 return error;
1219
1220 error = do_glock(qd, FORCE, &q_gh);
1221 if (!error)
1222 gfs2_glock_dq_uninit(&q_gh);
1223
1224 qd_put(qd);
1225 return error;
1226}
1227
1228int gfs2_quota_init(struct gfs2_sbd *sdp)
1229{
1230 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1231 u64 size = i_size_read(sdp->sd_qc_inode);
1232 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1233 unsigned int x, slot = 0;
1234 unsigned int found = 0;
1235 unsigned int hash;
1236 unsigned int bm_size;
1237 u64 dblock;
1238 u32 extlen = 0;
1239 int error;
1240
1241 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1242 return -EIO;
1243
1244 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1245 bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1246 bm_size *= sizeof(unsigned long);
1247 error = -ENOMEM;
1248 sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1249 if (sdp->sd_quota_bitmap == NULL)
1250 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1251 __GFP_ZERO, PAGE_KERNEL);
1252 if (!sdp->sd_quota_bitmap)
1253 return error;
1254
1255 for (x = 0; x < blocks; x++) {
1256 struct buffer_head *bh;
1257 const struct gfs2_quota_change *qc;
1258 unsigned int y;
1259
1260 if (!extlen) {
1261 int new = 0;
1262 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1263 if (error)
1264 goto fail;
1265 }
1266 error = -EIO;
1267 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1268 if (!bh)
1269 goto fail;
1270 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1271 brelse(bh);
1272 goto fail;
1273 }
1274
1275 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1276 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1277 y++, slot++) {
1278 struct gfs2_quota_data *qd;
1279 s64 qc_change = be64_to_cpu(qc->qc_change);
1280 u32 qc_flags = be32_to_cpu(qc->qc_flags);
1281 enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1282 USRQUOTA : GRPQUOTA;
1283 struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1284 be32_to_cpu(qc->qc_id));
1285 qc++;
1286 if (!qc_change)
1287 continue;
1288
1289 hash = gfs2_qd_hash(sdp, qc_id);
1290 qd = qd_alloc(hash, sdp, qc_id);
1291 if (qd == NULL) {
1292 brelse(bh);
1293 goto fail;
1294 }
1295
1296 set_bit(QDF_CHANGE, &qd->qd_flags);
1297 qd->qd_change = qc_change;
1298 qd->qd_slot = slot;
1299 qd->qd_slot_count = 1;
1300
1301 spin_lock(&qd_lock);
1302 BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1303 list_add(&qd->qd_list, &sdp->sd_quota_list);
1304 atomic_inc(&sdp->sd_quota_count);
1305 spin_unlock(&qd_lock);
1306
1307 spin_lock_bucket(hash);
1308 hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1309 spin_unlock_bucket(hash);
1310
1311 found++;
1312 }
1313
1314 brelse(bh);
1315 dblock++;
1316 extlen--;
1317 }
1318
1319 if (found)
1320 fs_info(sdp, "found %u quota changes\n", found);
1321
1322 return 0;
1323
1324fail:
1325 gfs2_quota_cleanup(sdp);
1326 return error;
1327}
1328
1329void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1330{
1331 struct list_head *head = &sdp->sd_quota_list;
1332 struct gfs2_quota_data *qd;
1333
1334 spin_lock(&qd_lock);
1335 while (!list_empty(head)) {
1336 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1337
1338 list_del(&qd->qd_list);
1339
1340 /* Also remove if this qd exists in the reclaim list */
1341 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1342 atomic_dec(&sdp->sd_quota_count);
1343 spin_unlock(&qd_lock);
1344
1345 spin_lock_bucket(qd->qd_hash);
1346 hlist_bl_del_rcu(&qd->qd_hlist);
1347 spin_unlock_bucket(qd->qd_hash);
1348
1349 gfs2_assert_warn(sdp, !qd->qd_change);
1350 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1351 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1352
1353 gfs2_glock_put(qd->qd_gl);
1354 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1355
1356 spin_lock(&qd_lock);
1357 }
1358 spin_unlock(&qd_lock);
1359
1360 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1361
1362 if (sdp->sd_quota_bitmap) {
1363 if (is_vmalloc_addr(sdp->sd_quota_bitmap))
1364 vfree(sdp->sd_quota_bitmap);
1365 else
1366 kfree(sdp->sd_quota_bitmap);
1367 sdp->sd_quota_bitmap = NULL;
1368 }
1369}
1370
1371static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1372{
1373 if (error == 0 || error == -EROFS)
1374 return;
1375 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1376 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1377}
1378
1379static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1380 int (*fxn)(struct super_block *sb, int type),
1381 unsigned long t, unsigned long *timeo,
1382 unsigned int *new_timeo)
1383{
1384 if (t >= *timeo) {
1385 int error = fxn(sdp->sd_vfs, 0);
1386 quotad_error(sdp, msg, error);
1387 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1388 } else {
1389 *timeo -= t;
1390 }
1391}
1392
1393static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1394{
1395 struct gfs2_inode *ip;
1396
1397 while(1) {
1398 ip = NULL;
1399 spin_lock(&sdp->sd_trunc_lock);
1400 if (!list_empty(&sdp->sd_trunc_list)) {
1401 ip = list_entry(sdp->sd_trunc_list.next,
1402 struct gfs2_inode, i_trunc_list);
1403 list_del_init(&ip->i_trunc_list);
1404 }
1405 spin_unlock(&sdp->sd_trunc_lock);
1406 if (ip == NULL)
1407 return;
1408 gfs2_glock_finish_truncate(ip);
1409 }
1410}
1411
1412void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1413 if (!sdp->sd_statfs_force_sync) {
1414 sdp->sd_statfs_force_sync = 1;
1415 wake_up(&sdp->sd_quota_wait);
1416 }
1417}
1418
1419
1420/**
1421 * gfs2_quotad - Write cached quota changes into the quota file
1422 * @sdp: Pointer to GFS2 superblock
1423 *
1424 */
1425
1426int gfs2_quotad(void *data)
1427{
1428 struct gfs2_sbd *sdp = data;
1429 struct gfs2_tune *tune = &sdp->sd_tune;
1430 unsigned long statfs_timeo = 0;
1431 unsigned long quotad_timeo = 0;
1432 unsigned long t = 0;
1433 DEFINE_WAIT(wait);
1434 int empty;
1435
1436 while (!kthread_should_stop()) {
1437
1438 /* Update the master statfs file */
1439 if (sdp->sd_statfs_force_sync) {
1440 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1441 quotad_error(sdp, "statfs", error);
1442 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1443 }
1444 else
1445 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1446 &statfs_timeo,
1447 &tune->gt_statfs_quantum);
1448
1449 /* Update quota file */
1450 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1451 "ad_timeo, &tune->gt_quota_quantum);
1452
1453 /* Check for & recover partially truncated inodes */
1454 quotad_check_trunc_list(sdp);
1455
1456 try_to_freeze();
1457
1458 t = min(quotad_timeo, statfs_timeo);
1459
1460 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1461 spin_lock(&sdp->sd_trunc_lock);
1462 empty = list_empty(&sdp->sd_trunc_list);
1463 spin_unlock(&sdp->sd_trunc_lock);
1464 if (empty && !sdp->sd_statfs_force_sync)
1465 t -= schedule_timeout(t);
1466 else
1467 t = 0;
1468 finish_wait(&sdp->sd_quota_wait, &wait);
1469 }
1470
1471 return 0;
1472}
1473
1474static int gfs2_quota_get_xstate(struct super_block *sb,
1475 struct fs_quota_stat *fqs)
1476{
1477 struct gfs2_sbd *sdp = sb->s_fs_info;
1478
1479 memset(fqs, 0, sizeof(struct fs_quota_stat));
1480 fqs->qs_version = FS_QSTAT_VERSION;
1481
1482 switch (sdp->sd_args.ar_quota) {
1483 case GFS2_QUOTA_ON:
1484 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1485 /*FALLTHRU*/
1486 case GFS2_QUOTA_ACCOUNT:
1487 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1488 break;
1489 case GFS2_QUOTA_OFF:
1490 break;
1491 }
1492
1493 if (sdp->sd_quota_inode) {
1494 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1495 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1496 }
1497 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1498 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1499 fqs->qs_incoredqs = list_lru_count(&gfs2_qd_lru);
1500 return 0;
1501}
1502
1503static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1504 struct fs_disk_quota *fdq)
1505{
1506 struct gfs2_sbd *sdp = sb->s_fs_info;
1507 struct gfs2_quota_lvb *qlvb;
1508 struct gfs2_quota_data *qd;
1509 struct gfs2_holder q_gh;
1510 int error;
1511
1512 memset(fdq, 0, sizeof(struct fs_disk_quota));
1513
1514 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1515 return -ESRCH; /* Crazy XFS error code */
1516
1517 if ((qid.type != USRQUOTA) &&
1518 (qid.type != GRPQUOTA))
1519 return -EINVAL;
1520
1521 error = qd_get(sdp, qid, &qd);
1522 if (error)
1523 return error;
1524 error = do_glock(qd, FORCE, &q_gh);
1525 if (error)
1526 goto out;
1527
1528 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1529 fdq->d_version = FS_DQUOT_VERSION;
1530 fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1531 fdq->d_id = from_kqid_munged(current_user_ns(), qid);
1532 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1533 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1534 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1535
1536 gfs2_glock_dq_uninit(&q_gh);
1537out:
1538 qd_put(qd);
1539 return error;
1540}
1541
1542/* GFS2 only supports a subset of the XFS fields */
1543#define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1544
1545static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1546 struct fs_disk_quota *fdq)
1547{
1548 struct gfs2_sbd *sdp = sb->s_fs_info;
1549 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1550 struct gfs2_quota_data *qd;
1551 struct gfs2_holder q_gh, i_gh;
1552 unsigned int data_blocks, ind_blocks;
1553 unsigned int blocks = 0;
1554 int alloc_required;
1555 loff_t offset;
1556 int error;
1557
1558 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1559 return -ESRCH; /* Crazy XFS error code */
1560
1561 if ((qid.type != USRQUOTA) &&
1562 (qid.type != GRPQUOTA))
1563 return -EINVAL;
1564
1565 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1566 return -EINVAL;
1567
1568 error = qd_get(sdp, qid, &qd);
1569 if (error)
1570 return error;
1571
1572 error = gfs2_rs_alloc(ip);
1573 if (error)
1574 goto out_put;
1575
1576 mutex_lock(&ip->i_inode.i_mutex);
1577 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1578 if (error)
1579 goto out_unlockput;
1580 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1581 if (error)
1582 goto out_q;
1583
1584 /* Check for existing entry, if none then alloc new blocks */
1585 error = update_qd(sdp, qd);
1586 if (error)
1587 goto out_i;
1588
1589 /* If nothing has changed, this is a no-op */
1590 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1591 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1592 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1593
1594 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1595 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1596 fdq->d_fieldmask ^= FS_DQ_BHARD;
1597
1598 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1599 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1600 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1601
1602 if (fdq->d_fieldmask == 0)
1603 goto out_i;
1604
1605 offset = qd2offset(qd);
1606 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1607 if (gfs2_is_stuffed(ip))
1608 alloc_required = 1;
1609 if (alloc_required) {
1610 struct gfs2_alloc_parms ap = { .aflags = 0, };
1611 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1612 &data_blocks, &ind_blocks);
1613 blocks = 1 + data_blocks + ind_blocks;
1614 ap.target = blocks;
1615 error = gfs2_inplace_reserve(ip, &ap);
1616 if (error)
1617 goto out_i;
1618 blocks += gfs2_rg_blocks(ip, blocks);
1619 }
1620
1621 /* Some quotas span block boundaries and can update two blocks,
1622 adding an extra block to the transaction to handle such quotas */
1623 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1624 if (error)
1625 goto out_release;
1626
1627 /* Apply changes */
1628 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1629
1630 gfs2_trans_end(sdp);
1631out_release:
1632 if (alloc_required)
1633 gfs2_inplace_release(ip);
1634out_i:
1635 gfs2_glock_dq_uninit(&i_gh);
1636out_q:
1637 gfs2_glock_dq_uninit(&q_gh);
1638out_unlockput:
1639 mutex_unlock(&ip->i_inode.i_mutex);
1640out_put:
1641 qd_put(qd);
1642 return error;
1643}
1644
1645const struct quotactl_ops gfs2_quotactl_ops = {
1646 .quota_sync = gfs2_quota_sync,
1647 .get_xstate = gfs2_quota_get_xstate,
1648 .get_dqblk = gfs2_get_dqblk,
1649 .set_dqblk = gfs2_set_dqblk,
1650};
1651
1652void __init gfs2_quota_hash_init(void)
1653{
1654 unsigned i;
1655
1656 for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1657 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1658}