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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_name.ln_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,
149 struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
150{
151 struct list_head *dispose = arg;
152 struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
153
154 if (!spin_trylock(&qd->qd_lockref.lock))
155 return LRU_SKIP;
156
157 if (qd->qd_lockref.count == 0) {
158 lockref_mark_dead(&qd->qd_lockref);
159 list_lru_isolate_move(lru, &qd->qd_lru, dispose);
160 }
161
162 spin_unlock(&qd->qd_lockref.lock);
163 return LRU_REMOVED;
164}
165
166static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
167 struct shrink_control *sc)
168{
169 LIST_HEAD(dispose);
170 unsigned long freed;
171
172 if (!(sc->gfp_mask & __GFP_FS))
173 return SHRINK_STOP;
174
175 freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
176 gfs2_qd_isolate, &dispose);
177
178 gfs2_qd_dispose(&dispose);
179
180 return freed;
181}
182
183static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
184 struct shrink_control *sc)
185{
186 return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
187}
188
189struct shrinker gfs2_qd_shrinker = {
190 .count_objects = gfs2_qd_shrink_count,
191 .scan_objects = gfs2_qd_shrink_scan,
192 .seeks = DEFAULT_SEEKS,
193 .flags = SHRINKER_NUMA_AWARE,
194};
195
196
197static u64 qd2index(struct gfs2_quota_data *qd)
198{
199 struct kqid qid = qd->qd_id;
200 return (2 * (u64)from_kqid(&init_user_ns, qid)) +
201 ((qid.type == USRQUOTA) ? 0 : 1);
202}
203
204static u64 qd2offset(struct gfs2_quota_data *qd)
205{
206 u64 offset;
207
208 offset = qd2index(qd);
209 offset *= sizeof(struct gfs2_quota);
210
211 return offset;
212}
213
214static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
215{
216 struct gfs2_quota_data *qd;
217 int error;
218
219 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
220 if (!qd)
221 return NULL;
222
223 qd->qd_sbd = sdp;
224 qd->qd_lockref.count = 1;
225 spin_lock_init(&qd->qd_lockref.lock);
226 qd->qd_id = qid;
227 qd->qd_slot = -1;
228 INIT_LIST_HEAD(&qd->qd_lru);
229 qd->qd_hash = hash;
230
231 error = gfs2_glock_get(sdp, qd2index(qd),
232 &gfs2_quota_glops, CREATE, &qd->qd_gl);
233 if (error)
234 goto fail;
235
236 return qd;
237
238fail:
239 kmem_cache_free(gfs2_quotad_cachep, qd);
240 return NULL;
241}
242
243static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
244 const struct gfs2_sbd *sdp,
245 struct kqid qid)
246{
247 struct gfs2_quota_data *qd;
248 struct hlist_bl_node *h;
249
250 hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
251 if (!qid_eq(qd->qd_id, qid))
252 continue;
253 if (qd->qd_sbd != sdp)
254 continue;
255 if (lockref_get_not_dead(&qd->qd_lockref)) {
256 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
257 return qd;
258 }
259 }
260
261 return NULL;
262}
263
264
265static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
266 struct gfs2_quota_data **qdp)
267{
268 struct gfs2_quota_data *qd, *new_qd;
269 unsigned int hash = gfs2_qd_hash(sdp, qid);
270
271 rcu_read_lock();
272 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
273 rcu_read_unlock();
274
275 if (qd)
276 return 0;
277
278 new_qd = qd_alloc(hash, sdp, qid);
279 if (!new_qd)
280 return -ENOMEM;
281
282 spin_lock(&qd_lock);
283 spin_lock_bucket(hash);
284 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
285 if (qd == NULL) {
286 *qdp = new_qd;
287 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
288 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
289 atomic_inc(&sdp->sd_quota_count);
290 }
291 spin_unlock_bucket(hash);
292 spin_unlock(&qd_lock);
293
294 if (qd) {
295 gfs2_glock_put(new_qd->qd_gl);
296 kmem_cache_free(gfs2_quotad_cachep, new_qd);
297 }
298
299 return 0;
300}
301
302
303static void qd_hold(struct gfs2_quota_data *qd)
304{
305 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
306 gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
307 lockref_get(&qd->qd_lockref);
308}
309
310static void qd_put(struct gfs2_quota_data *qd)
311{
312 if (lockref_put_or_lock(&qd->qd_lockref))
313 return;
314
315 qd->qd_lockref.count = 0;
316 list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
317 spin_unlock(&qd->qd_lockref.lock);
318
319}
320
321static int slot_get(struct gfs2_quota_data *qd)
322{
323 struct gfs2_sbd *sdp = qd->qd_sbd;
324 unsigned int bit;
325 int error = 0;
326
327 spin_lock(&sdp->sd_bitmap_lock);
328 if (qd->qd_slot_count != 0)
329 goto out;
330
331 error = -ENOSPC;
332 bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
333 if (bit < sdp->sd_quota_slots) {
334 set_bit(bit, sdp->sd_quota_bitmap);
335 qd->qd_slot = bit;
336 error = 0;
337out:
338 qd->qd_slot_count++;
339 }
340 spin_unlock(&sdp->sd_bitmap_lock);
341
342 return error;
343}
344
345static void slot_hold(struct gfs2_quota_data *qd)
346{
347 struct gfs2_sbd *sdp = qd->qd_sbd;
348
349 spin_lock(&sdp->sd_bitmap_lock);
350 gfs2_assert(sdp, qd->qd_slot_count);
351 qd->qd_slot_count++;
352 spin_unlock(&sdp->sd_bitmap_lock);
353}
354
355static void slot_put(struct gfs2_quota_data *qd)
356{
357 struct gfs2_sbd *sdp = qd->qd_sbd;
358
359 spin_lock(&sdp->sd_bitmap_lock);
360 gfs2_assert(sdp, qd->qd_slot_count);
361 if (!--qd->qd_slot_count) {
362 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
363 qd->qd_slot = -1;
364 }
365 spin_unlock(&sdp->sd_bitmap_lock);
366}
367
368static int bh_get(struct gfs2_quota_data *qd)
369{
370 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
371 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
372 unsigned int block, offset;
373 struct buffer_head *bh;
374 int error;
375 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
376
377 mutex_lock(&sdp->sd_quota_mutex);
378
379 if (qd->qd_bh_count++) {
380 mutex_unlock(&sdp->sd_quota_mutex);
381 return 0;
382 }
383
384 block = qd->qd_slot / sdp->sd_qc_per_block;
385 offset = qd->qd_slot % sdp->sd_qc_per_block;
386
387 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
388 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
389 if (error)
390 goto fail;
391 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, 0, &bh);
392 if (error)
393 goto fail;
394 error = -EIO;
395 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
396 goto fail_brelse;
397
398 qd->qd_bh = bh;
399 qd->qd_bh_qc = (struct gfs2_quota_change *)
400 (bh->b_data + sizeof(struct gfs2_meta_header) +
401 offset * sizeof(struct gfs2_quota_change));
402
403 mutex_unlock(&sdp->sd_quota_mutex);
404
405 return 0;
406
407fail_brelse:
408 brelse(bh);
409fail:
410 qd->qd_bh_count--;
411 mutex_unlock(&sdp->sd_quota_mutex);
412 return error;
413}
414
415static void bh_put(struct gfs2_quota_data *qd)
416{
417 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
418
419 mutex_lock(&sdp->sd_quota_mutex);
420 gfs2_assert(sdp, qd->qd_bh_count);
421 if (!--qd->qd_bh_count) {
422 brelse(qd->qd_bh);
423 qd->qd_bh = NULL;
424 qd->qd_bh_qc = NULL;
425 }
426 mutex_unlock(&sdp->sd_quota_mutex);
427}
428
429static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
430 u64 *sync_gen)
431{
432 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
433 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
434 (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
435 return 0;
436
437 if (!lockref_get_not_dead(&qd->qd_lockref))
438 return 0;
439
440 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
441 set_bit(QDF_LOCKED, &qd->qd_flags);
442 qd->qd_change_sync = qd->qd_change;
443 slot_hold(qd);
444 return 1;
445}
446
447static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
448{
449 struct gfs2_quota_data *qd = NULL;
450 int error;
451 int found = 0;
452
453 *qdp = NULL;
454
455 if (sdp->sd_vfs->s_flags & MS_RDONLY)
456 return 0;
457
458 spin_lock(&qd_lock);
459
460 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
461 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
462 if (found)
463 break;
464 }
465
466 if (!found)
467 qd = NULL;
468
469 spin_unlock(&qd_lock);
470
471 if (qd) {
472 gfs2_assert_warn(sdp, qd->qd_change_sync);
473 error = bh_get(qd);
474 if (error) {
475 clear_bit(QDF_LOCKED, &qd->qd_flags);
476 slot_put(qd);
477 qd_put(qd);
478 return error;
479 }
480 }
481
482 *qdp = qd;
483
484 return 0;
485}
486
487static void qd_unlock(struct gfs2_quota_data *qd)
488{
489 gfs2_assert_warn(qd->qd_gl->gl_name.ln_sbd,
490 test_bit(QDF_LOCKED, &qd->qd_flags));
491 clear_bit(QDF_LOCKED, &qd->qd_flags);
492 bh_put(qd);
493 slot_put(qd);
494 qd_put(qd);
495}
496
497static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
498 struct gfs2_quota_data **qdp)
499{
500 int error;
501
502 error = qd_get(sdp, qid, qdp);
503 if (error)
504 return error;
505
506 error = slot_get(*qdp);
507 if (error)
508 goto fail;
509
510 error = bh_get(*qdp);
511 if (error)
512 goto fail_slot;
513
514 return 0;
515
516fail_slot:
517 slot_put(*qdp);
518fail:
519 qd_put(*qdp);
520 return error;
521}
522
523static void qdsb_put(struct gfs2_quota_data *qd)
524{
525 bh_put(qd);
526 slot_put(qd);
527 qd_put(qd);
528}
529
530/**
531 * gfs2_qa_alloc - make sure we have a quota allocations data structure,
532 * if necessary
533 * @ip: the inode for this reservation
534 */
535int gfs2_qa_alloc(struct gfs2_inode *ip)
536{
537 int error = 0;
538 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
539
540 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
541 return 0;
542
543 down_write(&ip->i_rw_mutex);
544 if (ip->i_qadata == NULL) {
545 ip->i_qadata = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
546 if (!ip->i_qadata)
547 error = -ENOMEM;
548 }
549 up_write(&ip->i_rw_mutex);
550 return error;
551}
552
553void gfs2_qa_delete(struct gfs2_inode *ip, atomic_t *wcount)
554{
555 down_write(&ip->i_rw_mutex);
556 if (ip->i_qadata && ((wcount == NULL) || (atomic_read(wcount) <= 1))) {
557 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
558 ip->i_qadata = NULL;
559 }
560 up_write(&ip->i_rw_mutex);
561}
562
563int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
564{
565 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
566 struct gfs2_quota_data **qd;
567 int error;
568
569 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
570 return 0;
571
572 if (ip->i_qadata == NULL) {
573 error = gfs2_rsqa_alloc(ip);
574 if (error)
575 return error;
576 }
577
578 qd = ip->i_qadata->qa_qd;
579
580 if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
581 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
582 return -EIO;
583
584 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
585 if (error)
586 goto out;
587 ip->i_qadata->qa_qd_num++;
588 qd++;
589
590 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
591 if (error)
592 goto out;
593 ip->i_qadata->qa_qd_num++;
594 qd++;
595
596 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
597 !uid_eq(uid, ip->i_inode.i_uid)) {
598 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
599 if (error)
600 goto out;
601 ip->i_qadata->qa_qd_num++;
602 qd++;
603 }
604
605 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
606 !gid_eq(gid, ip->i_inode.i_gid)) {
607 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
608 if (error)
609 goto out;
610 ip->i_qadata->qa_qd_num++;
611 qd++;
612 }
613
614out:
615 if (error)
616 gfs2_quota_unhold(ip);
617 return error;
618}
619
620void gfs2_quota_unhold(struct gfs2_inode *ip)
621{
622 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
623 u32 x;
624
625 if (ip->i_qadata == NULL)
626 return;
627 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
628
629 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
630 qdsb_put(ip->i_qadata->qa_qd[x]);
631 ip->i_qadata->qa_qd[x] = NULL;
632 }
633 ip->i_qadata->qa_qd_num = 0;
634}
635
636static int sort_qd(const void *a, const void *b)
637{
638 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
639 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
640
641 if (qid_lt(qd_a->qd_id, qd_b->qd_id))
642 return -1;
643 if (qid_lt(qd_b->qd_id, qd_a->qd_id))
644 return 1;
645 return 0;
646}
647
648static void do_qc(struct gfs2_quota_data *qd, s64 change)
649{
650 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
651 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
652 struct gfs2_quota_change *qc = qd->qd_bh_qc;
653 s64 x;
654
655 mutex_lock(&sdp->sd_quota_mutex);
656 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
657
658 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
659 qc->qc_change = 0;
660 qc->qc_flags = 0;
661 if (qd->qd_id.type == USRQUOTA)
662 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
663 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
664 }
665
666 x = be64_to_cpu(qc->qc_change) + change;
667 qc->qc_change = cpu_to_be64(x);
668
669 spin_lock(&qd_lock);
670 qd->qd_change = x;
671 spin_unlock(&qd_lock);
672
673 if (!x) {
674 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
675 clear_bit(QDF_CHANGE, &qd->qd_flags);
676 qc->qc_flags = 0;
677 qc->qc_id = 0;
678 slot_put(qd);
679 qd_put(qd);
680 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
681 qd_hold(qd);
682 slot_hold(qd);
683 }
684
685 if (change < 0) /* Reset quiet flag if we freed some blocks */
686 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
687 mutex_unlock(&sdp->sd_quota_mutex);
688}
689
690static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
691 unsigned off, void *buf, unsigned bytes)
692{
693 struct inode *inode = &ip->i_inode;
694 struct gfs2_sbd *sdp = GFS2_SB(inode);
695 struct address_space *mapping = inode->i_mapping;
696 struct page *page;
697 struct buffer_head *bh;
698 void *kaddr;
699 u64 blk;
700 unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
701 unsigned to_write = bytes, pg_off = off;
702 int done = 0;
703
704 blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
705 boff = off % bsize;
706
707 page = find_or_create_page(mapping, index, GFP_NOFS);
708 if (!page)
709 return -ENOMEM;
710 if (!page_has_buffers(page))
711 create_empty_buffers(page, bsize, 0);
712
713 bh = page_buffers(page);
714 while (!done) {
715 /* Find the beginning block within the page */
716 if (pg_off >= ((bnum * bsize) + bsize)) {
717 bh = bh->b_this_page;
718 bnum++;
719 blk++;
720 continue;
721 }
722 if (!buffer_mapped(bh)) {
723 gfs2_block_map(inode, blk, bh, 1);
724 if (!buffer_mapped(bh))
725 goto unlock_out;
726 /* If it's a newly allocated disk block, zero it */
727 if (buffer_new(bh))
728 zero_user(page, bnum * bsize, bh->b_size);
729 }
730 if (PageUptodate(page))
731 set_buffer_uptodate(bh);
732 if (!buffer_uptodate(bh)) {
733 ll_rw_block(READ | REQ_META, 1, &bh);
734 wait_on_buffer(bh);
735 if (!buffer_uptodate(bh))
736 goto unlock_out;
737 }
738 gfs2_trans_add_data(ip->i_gl, bh);
739
740 /* If we need to write to the next block as well */
741 if (to_write > (bsize - boff)) {
742 pg_off += (bsize - boff);
743 to_write -= (bsize - boff);
744 boff = pg_off % bsize;
745 continue;
746 }
747 done = 1;
748 }
749
750 /* Write to the page, now that we have setup the buffer(s) */
751 kaddr = kmap_atomic(page);
752 memcpy(kaddr + off, buf, bytes);
753 flush_dcache_page(page);
754 kunmap_atomic(kaddr);
755 unlock_page(page);
756 put_page(page);
757
758 return 0;
759
760unlock_out:
761 unlock_page(page);
762 put_page(page);
763 return -EIO;
764}
765
766static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp,
767 loff_t loc)
768{
769 unsigned long pg_beg;
770 unsigned pg_off, nbytes, overflow = 0;
771 int pg_oflow = 0, error;
772 void *ptr;
773
774 nbytes = sizeof(struct gfs2_quota);
775
776 pg_beg = loc >> PAGE_SHIFT;
777 pg_off = loc % PAGE_SIZE;
778
779 /* If the quota straddles a page boundary, split the write in two */
780 if ((pg_off + nbytes) > PAGE_SIZE) {
781 pg_oflow = 1;
782 overflow = (pg_off + nbytes) - PAGE_SIZE;
783 }
784
785 ptr = qp;
786 error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr,
787 nbytes - overflow);
788 /* If there's an overflow, write the remaining bytes to the next page */
789 if (!error && pg_oflow)
790 error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0,
791 ptr + nbytes - overflow,
792 overflow);
793 return error;
794}
795
796/**
797 * gfs2_adjust_quota - adjust record of current block usage
798 * @ip: The quota inode
799 * @loc: Offset of the entry in the quota file
800 * @change: The amount of usage change to record
801 * @qd: The quota data
802 * @fdq: The updated limits to record
803 *
804 * This function was mostly borrowed from gfs2_block_truncate_page which was
805 * in turn mostly borrowed from ext3
806 *
807 * Returns: 0 or -ve on error
808 */
809
810static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
811 s64 change, struct gfs2_quota_data *qd,
812 struct qc_dqblk *fdq)
813{
814 struct inode *inode = &ip->i_inode;
815 struct gfs2_sbd *sdp = GFS2_SB(inode);
816 struct gfs2_quota q;
817 int err;
818 u64 size;
819
820 if (gfs2_is_stuffed(ip)) {
821 err = gfs2_unstuff_dinode(ip, NULL);
822 if (err)
823 return err;
824 }
825
826 memset(&q, 0, sizeof(struct gfs2_quota));
827 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
828 if (err < 0)
829 return err;
830
831 loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
832 err = -EIO;
833 be64_add_cpu(&q.qu_value, change);
834 if (((s64)be64_to_cpu(q.qu_value)) < 0)
835 q.qu_value = 0; /* Never go negative on quota usage */
836 qd->qd_qb.qb_value = q.qu_value;
837 if (fdq) {
838 if (fdq->d_fieldmask & QC_SPC_SOFT) {
839 q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
840 qd->qd_qb.qb_warn = q.qu_warn;
841 }
842 if (fdq->d_fieldmask & QC_SPC_HARD) {
843 q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
844 qd->qd_qb.qb_limit = q.qu_limit;
845 }
846 if (fdq->d_fieldmask & QC_SPACE) {
847 q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
848 qd->qd_qb.qb_value = q.qu_value;
849 }
850 }
851
852 err = gfs2_write_disk_quota(ip, &q, loc);
853 if (!err) {
854 size = loc + sizeof(struct gfs2_quota);
855 if (size > inode->i_size)
856 i_size_write(inode, size);
857 inode->i_mtime = inode->i_atime = CURRENT_TIME;
858 mark_inode_dirty(inode);
859 set_bit(QDF_REFRESH, &qd->qd_flags);
860 }
861
862 return err;
863}
864
865static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
866{
867 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_name.ln_sbd;
868 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
869 struct gfs2_alloc_parms ap = { .aflags = 0, };
870 unsigned int data_blocks, ind_blocks;
871 struct gfs2_holder *ghs, i_gh;
872 unsigned int qx, x;
873 struct gfs2_quota_data *qd;
874 unsigned reserved;
875 loff_t offset;
876 unsigned int nalloc = 0, blocks;
877 int error;
878
879 error = gfs2_rsqa_alloc(ip);
880 if (error)
881 return error;
882
883 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
884 &data_blocks, &ind_blocks);
885
886 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
887 if (!ghs)
888 return -ENOMEM;
889
890 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
891 inode_lock(&ip->i_inode);
892 for (qx = 0; qx < num_qd; qx++) {
893 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
894 GL_NOCACHE, &ghs[qx]);
895 if (error)
896 goto out;
897 }
898
899 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
900 if (error)
901 goto out;
902
903 for (x = 0; x < num_qd; x++) {
904 offset = qd2offset(qda[x]);
905 if (gfs2_write_alloc_required(ip, offset,
906 sizeof(struct gfs2_quota)))
907 nalloc++;
908 }
909
910 /*
911 * 1 blk for unstuffing inode if stuffed. We add this extra
912 * block to the reservation unconditionally. If the inode
913 * doesn't need unstuffing, the block will be released to the
914 * rgrp since it won't be allocated during the transaction
915 */
916 /* +3 in the end for unstuffing block, inode size update block
917 * and another block in case quota straddles page boundary and
918 * two blocks need to be updated instead of 1 */
919 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
920
921 reserved = 1 + (nalloc * (data_blocks + ind_blocks));
922 ap.target = reserved;
923 error = gfs2_inplace_reserve(ip, &ap);
924 if (error)
925 goto out_alloc;
926
927 if (nalloc)
928 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
929
930 error = gfs2_trans_begin(sdp, blocks, 0);
931 if (error)
932 goto out_ipres;
933
934 for (x = 0; x < num_qd; x++) {
935 qd = qda[x];
936 offset = qd2offset(qd);
937 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
938 if (error)
939 goto out_end_trans;
940
941 do_qc(qd, -qd->qd_change_sync);
942 set_bit(QDF_REFRESH, &qd->qd_flags);
943 }
944
945 error = 0;
946
947out_end_trans:
948 gfs2_trans_end(sdp);
949out_ipres:
950 gfs2_inplace_release(ip);
951out_alloc:
952 gfs2_glock_dq_uninit(&i_gh);
953out:
954 while (qx--)
955 gfs2_glock_dq_uninit(&ghs[qx]);
956 inode_unlock(&ip->i_inode);
957 kfree(ghs);
958 gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl, NORMAL_FLUSH);
959 return error;
960}
961
962static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
963{
964 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
965 struct gfs2_quota q;
966 struct gfs2_quota_lvb *qlvb;
967 loff_t pos;
968 int error;
969
970 memset(&q, 0, sizeof(struct gfs2_quota));
971 pos = qd2offset(qd);
972 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
973 if (error < 0)
974 return error;
975
976 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
977 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
978 qlvb->__pad = 0;
979 qlvb->qb_limit = q.qu_limit;
980 qlvb->qb_warn = q.qu_warn;
981 qlvb->qb_value = q.qu_value;
982 qd->qd_qb = *qlvb;
983
984 return 0;
985}
986
987static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
988 struct gfs2_holder *q_gh)
989{
990 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
991 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
992 struct gfs2_holder i_gh;
993 int error;
994
995restart:
996 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
997 if (error)
998 return error;
999
1000 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1001 force_refresh = FORCE;
1002
1003 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1004
1005 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1006 gfs2_glock_dq_uninit(q_gh);
1007 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1008 GL_NOCACHE, q_gh);
1009 if (error)
1010 return error;
1011
1012 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1013 if (error)
1014 goto fail;
1015
1016 error = update_qd(sdp, qd);
1017 if (error)
1018 goto fail_gunlock;
1019
1020 gfs2_glock_dq_uninit(&i_gh);
1021 gfs2_glock_dq_uninit(q_gh);
1022 force_refresh = 0;
1023 goto restart;
1024 }
1025
1026 return 0;
1027
1028fail_gunlock:
1029 gfs2_glock_dq_uninit(&i_gh);
1030fail:
1031 gfs2_glock_dq_uninit(q_gh);
1032 return error;
1033}
1034
1035int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1036{
1037 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1038 struct gfs2_quota_data *qd;
1039 u32 x;
1040 int error = 0;
1041
1042 if (capable(CAP_SYS_RESOURCE) ||
1043 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1044 return 0;
1045
1046 error = gfs2_quota_hold(ip, uid, gid);
1047 if (error)
1048 return error;
1049
1050 sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1051 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1052
1053 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1054 qd = ip->i_qadata->qa_qd[x];
1055 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1056 if (error)
1057 break;
1058 }
1059
1060 if (!error)
1061 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1062 else {
1063 while (x--)
1064 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1065 gfs2_quota_unhold(ip);
1066 }
1067
1068 return error;
1069}
1070
1071static int need_sync(struct gfs2_quota_data *qd)
1072{
1073 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1074 struct gfs2_tune *gt = &sdp->sd_tune;
1075 s64 value;
1076 unsigned int num, den;
1077 int do_sync = 1;
1078
1079 if (!qd->qd_qb.qb_limit)
1080 return 0;
1081
1082 spin_lock(&qd_lock);
1083 value = qd->qd_change;
1084 spin_unlock(&qd_lock);
1085
1086 spin_lock(>->gt_spin);
1087 num = gt->gt_quota_scale_num;
1088 den = gt->gt_quota_scale_den;
1089 spin_unlock(>->gt_spin);
1090
1091 if (value < 0)
1092 do_sync = 0;
1093 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1094 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1095 do_sync = 0;
1096 else {
1097 value *= gfs2_jindex_size(sdp) * num;
1098 value = div_s64(value, den);
1099 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1100 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1101 do_sync = 0;
1102 }
1103
1104 return do_sync;
1105}
1106
1107void gfs2_quota_unlock(struct gfs2_inode *ip)
1108{
1109 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1110 struct gfs2_quota_data *qda[4];
1111 unsigned int count = 0;
1112 u32 x;
1113 int found;
1114
1115 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1116 goto out;
1117
1118 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1119 struct gfs2_quota_data *qd;
1120 int sync;
1121
1122 qd = ip->i_qadata->qa_qd[x];
1123 sync = need_sync(qd);
1124
1125 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1126 if (!sync)
1127 continue;
1128
1129 spin_lock(&qd_lock);
1130 found = qd_check_sync(sdp, qd, NULL);
1131 spin_unlock(&qd_lock);
1132
1133 if (!found)
1134 continue;
1135
1136 gfs2_assert_warn(sdp, qd->qd_change_sync);
1137 if (bh_get(qd)) {
1138 clear_bit(QDF_LOCKED, &qd->qd_flags);
1139 slot_put(qd);
1140 qd_put(qd);
1141 continue;
1142 }
1143
1144 qda[count++] = qd;
1145 }
1146
1147 if (count) {
1148 do_sync(count, qda);
1149 for (x = 0; x < count; x++)
1150 qd_unlock(qda[x]);
1151 }
1152
1153out:
1154 gfs2_quota_unhold(ip);
1155}
1156
1157#define MAX_LINE 256
1158
1159static int print_message(struct gfs2_quota_data *qd, char *type)
1160{
1161 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1162
1163 fs_info(sdp, "quota %s for %s %u\n",
1164 type,
1165 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1166 from_kqid(&init_user_ns, qd->qd_id));
1167
1168 return 0;
1169}
1170
1171/**
1172 * gfs2_quota_check - check if allocating new blocks will exceed quota
1173 * @ip: The inode for which this check is being performed
1174 * @uid: The uid to check against
1175 * @gid: The gid to check against
1176 * @ap: The allocation parameters. ap->target contains the requested
1177 * blocks. ap->min_target, if set, contains the minimum blks
1178 * requested.
1179 *
1180 * Returns: 0 on success.
1181 * min_req = ap->min_target ? ap->min_target : ap->target;
1182 * quota must allow atleast min_req blks for success and
1183 * ap->allowed is set to the number of blocks allowed
1184 *
1185 * -EDQUOT otherwise, quota violation. ap->allowed is set to number
1186 * of blocks available.
1187 */
1188int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1189 struct gfs2_alloc_parms *ap)
1190{
1191 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1192 struct gfs2_quota_data *qd;
1193 s64 value, warn, limit;
1194 u32 x;
1195 int error = 0;
1196
1197 ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1198 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1199 return 0;
1200
1201 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1202 return 0;
1203
1204 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1205 qd = ip->i_qadata->qa_qd[x];
1206
1207 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1208 qid_eq(qd->qd_id, make_kqid_gid(gid))))
1209 continue;
1210
1211 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1212 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1213 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1214 spin_lock(&qd_lock);
1215 value += qd->qd_change;
1216 spin_unlock(&qd_lock);
1217
1218 if (limit > 0 && (limit - value) < ap->allowed)
1219 ap->allowed = limit - value;
1220 /* If we can't meet the target */
1221 if (limit && limit < (value + (s64)ap->target)) {
1222 /* If no min_target specified or we don't meet
1223 * min_target, return -EDQUOT */
1224 if (!ap->min_target || ap->min_target > ap->allowed) {
1225 if (!test_and_set_bit(QDF_QMSG_QUIET,
1226 &qd->qd_flags)) {
1227 print_message(qd, "exceeded");
1228 quota_send_warning(qd->qd_id,
1229 sdp->sd_vfs->s_dev,
1230 QUOTA_NL_BHARDWARN);
1231 }
1232 error = -EDQUOT;
1233 break;
1234 }
1235 } else if (warn && warn < value &&
1236 time_after_eq(jiffies, qd->qd_last_warn +
1237 gfs2_tune_get(sdp, gt_quota_warn_period)
1238 * HZ)) {
1239 quota_send_warning(qd->qd_id,
1240 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1241 error = print_message(qd, "warning");
1242 qd->qd_last_warn = jiffies;
1243 }
1244 }
1245 return error;
1246}
1247
1248void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1249 kuid_t uid, kgid_t gid)
1250{
1251 struct gfs2_quota_data *qd;
1252 u32 x;
1253 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1254
1255 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON ||
1256 gfs2_assert_warn(sdp, change))
1257 return;
1258 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1259 return;
1260
1261 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1262 qd = ip->i_qadata->qa_qd[x];
1263
1264 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1265 qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1266 do_qc(qd, change);
1267 }
1268 }
1269}
1270
1271int gfs2_quota_sync(struct super_block *sb, int type)
1272{
1273 struct gfs2_sbd *sdp = sb->s_fs_info;
1274 struct gfs2_quota_data **qda;
1275 unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
1276 unsigned int num_qd;
1277 unsigned int x;
1278 int error = 0;
1279
1280 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1281 if (!qda)
1282 return -ENOMEM;
1283
1284 mutex_lock(&sdp->sd_quota_sync_mutex);
1285 sdp->sd_quota_sync_gen++;
1286
1287 do {
1288 num_qd = 0;
1289
1290 for (;;) {
1291 error = qd_fish(sdp, qda + num_qd);
1292 if (error || !qda[num_qd])
1293 break;
1294 if (++num_qd == max_qd)
1295 break;
1296 }
1297
1298 if (num_qd) {
1299 if (!error)
1300 error = do_sync(num_qd, qda);
1301 if (!error)
1302 for (x = 0; x < num_qd; x++)
1303 qda[x]->qd_sync_gen =
1304 sdp->sd_quota_sync_gen;
1305
1306 for (x = 0; x < num_qd; x++)
1307 qd_unlock(qda[x]);
1308 }
1309 } while (!error && num_qd == max_qd);
1310
1311 mutex_unlock(&sdp->sd_quota_sync_mutex);
1312 kfree(qda);
1313
1314 return error;
1315}
1316
1317int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1318{
1319 struct gfs2_quota_data *qd;
1320 struct gfs2_holder q_gh;
1321 int error;
1322
1323 error = qd_get(sdp, qid, &qd);
1324 if (error)
1325 return error;
1326
1327 error = do_glock(qd, FORCE, &q_gh);
1328 if (!error)
1329 gfs2_glock_dq_uninit(&q_gh);
1330
1331 qd_put(qd);
1332 return error;
1333}
1334
1335int gfs2_quota_init(struct gfs2_sbd *sdp)
1336{
1337 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1338 u64 size = i_size_read(sdp->sd_qc_inode);
1339 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1340 unsigned int x, slot = 0;
1341 unsigned int found = 0;
1342 unsigned int hash;
1343 unsigned int bm_size;
1344 u64 dblock;
1345 u32 extlen = 0;
1346 int error;
1347
1348 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1349 return -EIO;
1350
1351 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1352 bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1353 bm_size *= sizeof(unsigned long);
1354 error = -ENOMEM;
1355 sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1356 if (sdp->sd_quota_bitmap == NULL)
1357 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1358 __GFP_ZERO, PAGE_KERNEL);
1359 if (!sdp->sd_quota_bitmap)
1360 return error;
1361
1362 for (x = 0; x < blocks; x++) {
1363 struct buffer_head *bh;
1364 const struct gfs2_quota_change *qc;
1365 unsigned int y;
1366
1367 if (!extlen) {
1368 int new = 0;
1369 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1370 if (error)
1371 goto fail;
1372 }
1373 error = -EIO;
1374 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1375 if (!bh)
1376 goto fail;
1377 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1378 brelse(bh);
1379 goto fail;
1380 }
1381
1382 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1383 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1384 y++, slot++) {
1385 struct gfs2_quota_data *qd;
1386 s64 qc_change = be64_to_cpu(qc->qc_change);
1387 u32 qc_flags = be32_to_cpu(qc->qc_flags);
1388 enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1389 USRQUOTA : GRPQUOTA;
1390 struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1391 be32_to_cpu(qc->qc_id));
1392 qc++;
1393 if (!qc_change)
1394 continue;
1395
1396 hash = gfs2_qd_hash(sdp, qc_id);
1397 qd = qd_alloc(hash, sdp, qc_id);
1398 if (qd == NULL) {
1399 brelse(bh);
1400 goto fail;
1401 }
1402
1403 set_bit(QDF_CHANGE, &qd->qd_flags);
1404 qd->qd_change = qc_change;
1405 qd->qd_slot = slot;
1406 qd->qd_slot_count = 1;
1407
1408 spin_lock(&qd_lock);
1409 BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1410 list_add(&qd->qd_list, &sdp->sd_quota_list);
1411 atomic_inc(&sdp->sd_quota_count);
1412 spin_unlock(&qd_lock);
1413
1414 spin_lock_bucket(hash);
1415 hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1416 spin_unlock_bucket(hash);
1417
1418 found++;
1419 }
1420
1421 brelse(bh);
1422 dblock++;
1423 extlen--;
1424 }
1425
1426 if (found)
1427 fs_info(sdp, "found %u quota changes\n", found);
1428
1429 return 0;
1430
1431fail:
1432 gfs2_quota_cleanup(sdp);
1433 return error;
1434}
1435
1436void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1437{
1438 struct list_head *head = &sdp->sd_quota_list;
1439 struct gfs2_quota_data *qd;
1440
1441 spin_lock(&qd_lock);
1442 while (!list_empty(head)) {
1443 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1444
1445 list_del(&qd->qd_list);
1446
1447 /* Also remove if this qd exists in the reclaim list */
1448 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1449 atomic_dec(&sdp->sd_quota_count);
1450 spin_unlock(&qd_lock);
1451
1452 spin_lock_bucket(qd->qd_hash);
1453 hlist_bl_del_rcu(&qd->qd_hlist);
1454 spin_unlock_bucket(qd->qd_hash);
1455
1456 gfs2_assert_warn(sdp, !qd->qd_change);
1457 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1458 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1459
1460 gfs2_glock_put(qd->qd_gl);
1461 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1462
1463 spin_lock(&qd_lock);
1464 }
1465 spin_unlock(&qd_lock);
1466
1467 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1468
1469 kvfree(sdp->sd_quota_bitmap);
1470 sdp->sd_quota_bitmap = NULL;
1471}
1472
1473static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1474{
1475 if (error == 0 || error == -EROFS)
1476 return;
1477 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1478 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1479}
1480
1481static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1482 int (*fxn)(struct super_block *sb, int type),
1483 unsigned long t, unsigned long *timeo,
1484 unsigned int *new_timeo)
1485{
1486 if (t >= *timeo) {
1487 int error = fxn(sdp->sd_vfs, 0);
1488 quotad_error(sdp, msg, error);
1489 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1490 } else {
1491 *timeo -= t;
1492 }
1493}
1494
1495static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1496{
1497 struct gfs2_inode *ip;
1498
1499 while(1) {
1500 ip = NULL;
1501 spin_lock(&sdp->sd_trunc_lock);
1502 if (!list_empty(&sdp->sd_trunc_list)) {
1503 ip = list_entry(sdp->sd_trunc_list.next,
1504 struct gfs2_inode, i_trunc_list);
1505 list_del_init(&ip->i_trunc_list);
1506 }
1507 spin_unlock(&sdp->sd_trunc_lock);
1508 if (ip == NULL)
1509 return;
1510 gfs2_glock_finish_truncate(ip);
1511 }
1512}
1513
1514void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1515 if (!sdp->sd_statfs_force_sync) {
1516 sdp->sd_statfs_force_sync = 1;
1517 wake_up(&sdp->sd_quota_wait);
1518 }
1519}
1520
1521
1522/**
1523 * gfs2_quotad - Write cached quota changes into the quota file
1524 * @sdp: Pointer to GFS2 superblock
1525 *
1526 */
1527
1528int gfs2_quotad(void *data)
1529{
1530 struct gfs2_sbd *sdp = data;
1531 struct gfs2_tune *tune = &sdp->sd_tune;
1532 unsigned long statfs_timeo = 0;
1533 unsigned long quotad_timeo = 0;
1534 unsigned long t = 0;
1535 DEFINE_WAIT(wait);
1536 int empty;
1537
1538 while (!kthread_should_stop()) {
1539
1540 /* Update the master statfs file */
1541 if (sdp->sd_statfs_force_sync) {
1542 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1543 quotad_error(sdp, "statfs", error);
1544 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1545 }
1546 else
1547 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1548 &statfs_timeo,
1549 &tune->gt_statfs_quantum);
1550
1551 /* Update quota file */
1552 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1553 "ad_timeo, &tune->gt_quota_quantum);
1554
1555 /* Check for & recover partially truncated inodes */
1556 quotad_check_trunc_list(sdp);
1557
1558 try_to_freeze();
1559
1560 t = min(quotad_timeo, statfs_timeo);
1561
1562 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1563 spin_lock(&sdp->sd_trunc_lock);
1564 empty = list_empty(&sdp->sd_trunc_list);
1565 spin_unlock(&sdp->sd_trunc_lock);
1566 if (empty && !sdp->sd_statfs_force_sync)
1567 t -= schedule_timeout(t);
1568 else
1569 t = 0;
1570 finish_wait(&sdp->sd_quota_wait, &wait);
1571 }
1572
1573 return 0;
1574}
1575
1576static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1577{
1578 struct gfs2_sbd *sdp = sb->s_fs_info;
1579
1580 memset(state, 0, sizeof(*state));
1581
1582 switch (sdp->sd_args.ar_quota) {
1583 case GFS2_QUOTA_ON:
1584 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1585 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1586 /*FALLTHRU*/
1587 case GFS2_QUOTA_ACCOUNT:
1588 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1589 QCI_SYSFILE;
1590 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1591 QCI_SYSFILE;
1592 break;
1593 case GFS2_QUOTA_OFF:
1594 break;
1595 }
1596 if (sdp->sd_quota_inode) {
1597 state->s_state[USRQUOTA].ino =
1598 GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1599 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1600 }
1601 state->s_state[USRQUOTA].nextents = 1; /* unsupported */
1602 state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1603 state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1604 return 0;
1605}
1606
1607static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1608 struct qc_dqblk *fdq)
1609{
1610 struct gfs2_sbd *sdp = sb->s_fs_info;
1611 struct gfs2_quota_lvb *qlvb;
1612 struct gfs2_quota_data *qd;
1613 struct gfs2_holder q_gh;
1614 int error;
1615
1616 memset(fdq, 0, sizeof(*fdq));
1617
1618 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1619 return -ESRCH; /* Crazy XFS error code */
1620
1621 if ((qid.type != USRQUOTA) &&
1622 (qid.type != GRPQUOTA))
1623 return -EINVAL;
1624
1625 error = qd_get(sdp, qid, &qd);
1626 if (error)
1627 return error;
1628 error = do_glock(qd, FORCE, &q_gh);
1629 if (error)
1630 goto out;
1631
1632 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1633 fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1634 fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1635 fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1636
1637 gfs2_glock_dq_uninit(&q_gh);
1638out:
1639 qd_put(qd);
1640 return error;
1641}
1642
1643/* GFS2 only supports a subset of the XFS fields */
1644#define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1645
1646static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1647 struct qc_dqblk *fdq)
1648{
1649 struct gfs2_sbd *sdp = sb->s_fs_info;
1650 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1651 struct gfs2_quota_data *qd;
1652 struct gfs2_holder q_gh, i_gh;
1653 unsigned int data_blocks, ind_blocks;
1654 unsigned int blocks = 0;
1655 int alloc_required;
1656 loff_t offset;
1657 int error;
1658
1659 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1660 return -ESRCH; /* Crazy XFS error code */
1661
1662 if ((qid.type != USRQUOTA) &&
1663 (qid.type != GRPQUOTA))
1664 return -EINVAL;
1665
1666 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1667 return -EINVAL;
1668
1669 error = qd_get(sdp, qid, &qd);
1670 if (error)
1671 return error;
1672
1673 error = gfs2_rsqa_alloc(ip);
1674 if (error)
1675 goto out_put;
1676
1677 inode_lock(&ip->i_inode);
1678 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1679 if (error)
1680 goto out_unlockput;
1681 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1682 if (error)
1683 goto out_q;
1684
1685 /* Check for existing entry, if none then alloc new blocks */
1686 error = update_qd(sdp, qd);
1687 if (error)
1688 goto out_i;
1689
1690 /* If nothing has changed, this is a no-op */
1691 if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1692 ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1693 fdq->d_fieldmask ^= QC_SPC_SOFT;
1694
1695 if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1696 ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1697 fdq->d_fieldmask ^= QC_SPC_HARD;
1698
1699 if ((fdq->d_fieldmask & QC_SPACE) &&
1700 ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1701 fdq->d_fieldmask ^= QC_SPACE;
1702
1703 if (fdq->d_fieldmask == 0)
1704 goto out_i;
1705
1706 offset = qd2offset(qd);
1707 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1708 if (gfs2_is_stuffed(ip))
1709 alloc_required = 1;
1710 if (alloc_required) {
1711 struct gfs2_alloc_parms ap = { .aflags = 0, };
1712 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1713 &data_blocks, &ind_blocks);
1714 blocks = 1 + data_blocks + ind_blocks;
1715 ap.target = blocks;
1716 error = gfs2_inplace_reserve(ip, &ap);
1717 if (error)
1718 goto out_i;
1719 blocks += gfs2_rg_blocks(ip, blocks);
1720 }
1721
1722 /* Some quotas span block boundaries and can update two blocks,
1723 adding an extra block to the transaction to handle such quotas */
1724 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1725 if (error)
1726 goto out_release;
1727
1728 /* Apply changes */
1729 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1730 if (!error)
1731 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1732
1733 gfs2_trans_end(sdp);
1734out_release:
1735 if (alloc_required)
1736 gfs2_inplace_release(ip);
1737out_i:
1738 gfs2_glock_dq_uninit(&i_gh);
1739out_q:
1740 gfs2_glock_dq_uninit(&q_gh);
1741out_unlockput:
1742 inode_unlock(&ip->i_inode);
1743out_put:
1744 qd_put(qd);
1745 return error;
1746}
1747
1748const struct quotactl_ops gfs2_quotactl_ops = {
1749 .quota_sync = gfs2_quota_sync,
1750 .get_state = gfs2_quota_get_state,
1751 .get_dqblk = gfs2_get_dqblk,
1752 .set_dqblk = gfs2_set_dqblk,
1753};
1754
1755void __init gfs2_quota_hash_init(void)
1756{
1757 unsigned i;
1758
1759 for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1760 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1761}