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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#include <linux/sched.h>
40#include <linux/slab.h>
41#include <linux/mm.h>
42#include <linux/spinlock.h>
43#include <linux/completion.h>
44#include <linux/buffer_head.h>
45#include <linux/sort.h>
46#include <linux/fs.h>
47#include <linux/bio.h>
48#include <linux/gfs2_ondisk.h>
49#include <linux/kthread.h>
50#include <linux/freezer.h>
51#include <linux/quota.h>
52#include <linux/dqblk_xfs.h>
53
54#include "gfs2.h"
55#include "incore.h"
56#include "bmap.h"
57#include "glock.h"
58#include "glops.h"
59#include "log.h"
60#include "meta_io.h"
61#include "quota.h"
62#include "rgrp.h"
63#include "super.h"
64#include "trans.h"
65#include "inode.h"
66#include "util.h"
67
68#define QUOTA_USER 1
69#define QUOTA_GROUP 0
70
71struct gfs2_quota_change_host {
72 u64 qc_change;
73 u32 qc_flags; /* GFS2_QCF_... */
74 u32 qc_id;
75};
76
77static LIST_HEAD(qd_lru_list);
78static atomic_t qd_lru_count = ATOMIC_INIT(0);
79static DEFINE_SPINLOCK(qd_lru_lock);
80
81int gfs2_shrink_qd_memory(struct shrinker *shrink, struct shrink_control *sc)
82{
83 struct gfs2_quota_data *qd;
84 struct gfs2_sbd *sdp;
85 int nr_to_scan = sc->nr_to_scan;
86
87 if (nr_to_scan == 0)
88 goto out;
89
90 if (!(sc->gfp_mask & __GFP_FS))
91 return -1;
92
93 spin_lock(&qd_lru_lock);
94 while (nr_to_scan && !list_empty(&qd_lru_list)) {
95 qd = list_entry(qd_lru_list.next,
96 struct gfs2_quota_data, qd_reclaim);
97 sdp = qd->qd_gl->gl_sbd;
98
99 /* Free from the filesystem-specific list */
100 list_del(&qd->qd_list);
101
102 gfs2_assert_warn(sdp, !qd->qd_change);
103 gfs2_assert_warn(sdp, !qd->qd_slot_count);
104 gfs2_assert_warn(sdp, !qd->qd_bh_count);
105
106 gfs2_glock_put(qd->qd_gl);
107 atomic_dec(&sdp->sd_quota_count);
108
109 /* Delete it from the common reclaim list */
110 list_del_init(&qd->qd_reclaim);
111 atomic_dec(&qd_lru_count);
112 spin_unlock(&qd_lru_lock);
113 kmem_cache_free(gfs2_quotad_cachep, qd);
114 spin_lock(&qd_lru_lock);
115 nr_to_scan--;
116 }
117 spin_unlock(&qd_lru_lock);
118
119out:
120 return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
121}
122
123static u64 qd2offset(struct gfs2_quota_data *qd)
124{
125 u64 offset;
126
127 offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
128 offset *= sizeof(struct gfs2_quota);
129
130 return offset;
131}
132
133static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
134 struct gfs2_quota_data **qdp)
135{
136 struct gfs2_quota_data *qd;
137 int error;
138
139 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
140 if (!qd)
141 return -ENOMEM;
142
143 atomic_set(&qd->qd_count, 1);
144 qd->qd_id = id;
145 if (user)
146 set_bit(QDF_USER, &qd->qd_flags);
147 qd->qd_slot = -1;
148 INIT_LIST_HEAD(&qd->qd_reclaim);
149
150 error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
151 &gfs2_quota_glops, CREATE, &qd->qd_gl);
152 if (error)
153 goto fail;
154
155 *qdp = qd;
156
157 return 0;
158
159fail:
160 kmem_cache_free(gfs2_quotad_cachep, qd);
161 return error;
162}
163
164static int qd_get(struct gfs2_sbd *sdp, int user, u32 id,
165 struct gfs2_quota_data **qdp)
166{
167 struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
168 int error, found;
169
170 *qdp = NULL;
171
172 for (;;) {
173 found = 0;
174 spin_lock(&qd_lru_lock);
175 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
176 if (qd->qd_id == id &&
177 !test_bit(QDF_USER, &qd->qd_flags) == !user) {
178 if (!atomic_read(&qd->qd_count) &&
179 !list_empty(&qd->qd_reclaim)) {
180 /* Remove it from reclaim list */
181 list_del_init(&qd->qd_reclaim);
182 atomic_dec(&qd_lru_count);
183 }
184 atomic_inc(&qd->qd_count);
185 found = 1;
186 break;
187 }
188 }
189
190 if (!found)
191 qd = NULL;
192
193 if (!qd && new_qd) {
194 qd = new_qd;
195 list_add(&qd->qd_list, &sdp->sd_quota_list);
196 atomic_inc(&sdp->sd_quota_count);
197 new_qd = NULL;
198 }
199
200 spin_unlock(&qd_lru_lock);
201
202 if (qd) {
203 if (new_qd) {
204 gfs2_glock_put(new_qd->qd_gl);
205 kmem_cache_free(gfs2_quotad_cachep, new_qd);
206 }
207 *qdp = qd;
208 return 0;
209 }
210
211 error = qd_alloc(sdp, user, id, &new_qd);
212 if (error)
213 return error;
214 }
215}
216
217static void qd_hold(struct gfs2_quota_data *qd)
218{
219 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
220 gfs2_assert(sdp, atomic_read(&qd->qd_count));
221 atomic_inc(&qd->qd_count);
222}
223
224static void qd_put(struct gfs2_quota_data *qd)
225{
226 if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) {
227 /* Add to the reclaim list */
228 list_add_tail(&qd->qd_reclaim, &qd_lru_list);
229 atomic_inc(&qd_lru_count);
230 spin_unlock(&qd_lru_lock);
231 }
232}
233
234static int slot_get(struct gfs2_quota_data *qd)
235{
236 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
237 unsigned int c, o = 0, b;
238 unsigned char byte = 0;
239
240 spin_lock(&qd_lru_lock);
241
242 if (qd->qd_slot_count++) {
243 spin_unlock(&qd_lru_lock);
244 return 0;
245 }
246
247 for (c = 0; c < sdp->sd_quota_chunks; c++)
248 for (o = 0; o < PAGE_SIZE; o++) {
249 byte = sdp->sd_quota_bitmap[c][o];
250 if (byte != 0xFF)
251 goto found;
252 }
253
254 goto fail;
255
256found:
257 for (b = 0; b < 8; b++)
258 if (!(byte & (1 << b)))
259 break;
260 qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
261
262 if (qd->qd_slot >= sdp->sd_quota_slots)
263 goto fail;
264
265 sdp->sd_quota_bitmap[c][o] |= 1 << b;
266
267 spin_unlock(&qd_lru_lock);
268
269 return 0;
270
271fail:
272 qd->qd_slot_count--;
273 spin_unlock(&qd_lru_lock);
274 return -ENOSPC;
275}
276
277static void slot_hold(struct gfs2_quota_data *qd)
278{
279 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
280
281 spin_lock(&qd_lru_lock);
282 gfs2_assert(sdp, qd->qd_slot_count);
283 qd->qd_slot_count++;
284 spin_unlock(&qd_lru_lock);
285}
286
287static void slot_put(struct gfs2_quota_data *qd)
288{
289 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
290
291 spin_lock(&qd_lru_lock);
292 gfs2_assert(sdp, qd->qd_slot_count);
293 if (!--qd->qd_slot_count) {
294 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
295 qd->qd_slot = -1;
296 }
297 spin_unlock(&qd_lru_lock);
298}
299
300static int bh_get(struct gfs2_quota_data *qd)
301{
302 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
303 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
304 unsigned int block, offset;
305 struct buffer_head *bh;
306 int error;
307 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
308
309 mutex_lock(&sdp->sd_quota_mutex);
310
311 if (qd->qd_bh_count++) {
312 mutex_unlock(&sdp->sd_quota_mutex);
313 return 0;
314 }
315
316 block = qd->qd_slot / sdp->sd_qc_per_block;
317 offset = qd->qd_slot % sdp->sd_qc_per_block;
318
319 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
320 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
321 if (error)
322 goto fail;
323 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
324 if (error)
325 goto fail;
326 error = -EIO;
327 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
328 goto fail_brelse;
329
330 qd->qd_bh = bh;
331 qd->qd_bh_qc = (struct gfs2_quota_change *)
332 (bh->b_data + sizeof(struct gfs2_meta_header) +
333 offset * sizeof(struct gfs2_quota_change));
334
335 mutex_unlock(&sdp->sd_quota_mutex);
336
337 return 0;
338
339fail_brelse:
340 brelse(bh);
341fail:
342 qd->qd_bh_count--;
343 mutex_unlock(&sdp->sd_quota_mutex);
344 return error;
345}
346
347static void bh_put(struct gfs2_quota_data *qd)
348{
349 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
350
351 mutex_lock(&sdp->sd_quota_mutex);
352 gfs2_assert(sdp, qd->qd_bh_count);
353 if (!--qd->qd_bh_count) {
354 brelse(qd->qd_bh);
355 qd->qd_bh = NULL;
356 qd->qd_bh_qc = NULL;
357 }
358 mutex_unlock(&sdp->sd_quota_mutex);
359}
360
361static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
362{
363 struct gfs2_quota_data *qd = NULL;
364 int error;
365 int found = 0;
366
367 *qdp = NULL;
368
369 if (sdp->sd_vfs->s_flags & MS_RDONLY)
370 return 0;
371
372 spin_lock(&qd_lru_lock);
373
374 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
375 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
376 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
377 qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
378 continue;
379
380 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
381
382 set_bit(QDF_LOCKED, &qd->qd_flags);
383 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
384 atomic_inc(&qd->qd_count);
385 qd->qd_change_sync = qd->qd_change;
386 gfs2_assert_warn(sdp, qd->qd_slot_count);
387 qd->qd_slot_count++;
388 found = 1;
389
390 break;
391 }
392
393 if (!found)
394 qd = NULL;
395
396 spin_unlock(&qd_lru_lock);
397
398 if (qd) {
399 gfs2_assert_warn(sdp, qd->qd_change_sync);
400 error = bh_get(qd);
401 if (error) {
402 clear_bit(QDF_LOCKED, &qd->qd_flags);
403 slot_put(qd);
404 qd_put(qd);
405 return error;
406 }
407 }
408
409 *qdp = qd;
410
411 return 0;
412}
413
414static int qd_trylock(struct gfs2_quota_data *qd)
415{
416 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
417
418 if (sdp->sd_vfs->s_flags & MS_RDONLY)
419 return 0;
420
421 spin_lock(&qd_lru_lock);
422
423 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
424 !test_bit(QDF_CHANGE, &qd->qd_flags)) {
425 spin_unlock(&qd_lru_lock);
426 return 0;
427 }
428
429 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
430
431 set_bit(QDF_LOCKED, &qd->qd_flags);
432 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
433 atomic_inc(&qd->qd_count);
434 qd->qd_change_sync = qd->qd_change;
435 gfs2_assert_warn(sdp, qd->qd_slot_count);
436 qd->qd_slot_count++;
437
438 spin_unlock(&qd_lru_lock);
439
440 gfs2_assert_warn(sdp, qd->qd_change_sync);
441 if (bh_get(qd)) {
442 clear_bit(QDF_LOCKED, &qd->qd_flags);
443 slot_put(qd);
444 qd_put(qd);
445 return 0;
446 }
447
448 return 1;
449}
450
451static void qd_unlock(struct gfs2_quota_data *qd)
452{
453 gfs2_assert_warn(qd->qd_gl->gl_sbd,
454 test_bit(QDF_LOCKED, &qd->qd_flags));
455 clear_bit(QDF_LOCKED, &qd->qd_flags);
456 bh_put(qd);
457 slot_put(qd);
458 qd_put(qd);
459}
460
461static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id,
462 struct gfs2_quota_data **qdp)
463{
464 int error;
465
466 error = qd_get(sdp, user, id, qdp);
467 if (error)
468 return error;
469
470 error = slot_get(*qdp);
471 if (error)
472 goto fail;
473
474 error = bh_get(*qdp);
475 if (error)
476 goto fail_slot;
477
478 return 0;
479
480fail_slot:
481 slot_put(*qdp);
482fail:
483 qd_put(*qdp);
484 return error;
485}
486
487static void qdsb_put(struct gfs2_quota_data *qd)
488{
489 bh_put(qd);
490 slot_put(qd);
491 qd_put(qd);
492}
493
494int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
495{
496 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
497 struct gfs2_qadata *qa = ip->i_qadata;
498 struct gfs2_quota_data **qd = qa->qa_qd;
499 int error;
500
501 if (gfs2_assert_warn(sdp, !qa->qa_qd_num) ||
502 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
503 return -EIO;
504
505 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
506 return 0;
507
508 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
509 if (error)
510 goto out;
511 qa->qa_qd_num++;
512 qd++;
513
514 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
515 if (error)
516 goto out;
517 qa->qa_qd_num++;
518 qd++;
519
520 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
521 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
522 if (error)
523 goto out;
524 qa->qa_qd_num++;
525 qd++;
526 }
527
528 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
529 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
530 if (error)
531 goto out;
532 qa->qa_qd_num++;
533 qd++;
534 }
535
536out:
537 if (error)
538 gfs2_quota_unhold(ip);
539 return error;
540}
541
542void gfs2_quota_unhold(struct gfs2_inode *ip)
543{
544 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
545 struct gfs2_qadata *qa = ip->i_qadata;
546 unsigned int x;
547
548 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
549
550 for (x = 0; x < qa->qa_qd_num; x++) {
551 qdsb_put(qa->qa_qd[x]);
552 qa->qa_qd[x] = NULL;
553 }
554 qa->qa_qd_num = 0;
555}
556
557static int sort_qd(const void *a, const void *b)
558{
559 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
560 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
561
562 if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
563 !test_bit(QDF_USER, &qd_b->qd_flags)) {
564 if (test_bit(QDF_USER, &qd_a->qd_flags))
565 return -1;
566 else
567 return 1;
568 }
569 if (qd_a->qd_id < qd_b->qd_id)
570 return -1;
571 if (qd_a->qd_id > qd_b->qd_id)
572 return 1;
573
574 return 0;
575}
576
577static void do_qc(struct gfs2_quota_data *qd, s64 change)
578{
579 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
580 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
581 struct gfs2_quota_change *qc = qd->qd_bh_qc;
582 s64 x;
583
584 mutex_lock(&sdp->sd_quota_mutex);
585 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
586
587 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
588 qc->qc_change = 0;
589 qc->qc_flags = 0;
590 if (test_bit(QDF_USER, &qd->qd_flags))
591 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
592 qc->qc_id = cpu_to_be32(qd->qd_id);
593 }
594
595 x = be64_to_cpu(qc->qc_change) + change;
596 qc->qc_change = cpu_to_be64(x);
597
598 spin_lock(&qd_lru_lock);
599 qd->qd_change = x;
600 spin_unlock(&qd_lru_lock);
601
602 if (!x) {
603 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
604 clear_bit(QDF_CHANGE, &qd->qd_flags);
605 qc->qc_flags = 0;
606 qc->qc_id = 0;
607 slot_put(qd);
608 qd_put(qd);
609 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
610 qd_hold(qd);
611 slot_hold(qd);
612 }
613
614 mutex_unlock(&sdp->sd_quota_mutex);
615}
616
617/**
618 * gfs2_adjust_quota - adjust record of current block usage
619 * @ip: The quota inode
620 * @loc: Offset of the entry in the quota file
621 * @change: The amount of usage change to record
622 * @qd: The quota data
623 * @fdq: The updated limits to record
624 *
625 * This function was mostly borrowed from gfs2_block_truncate_page which was
626 * in turn mostly borrowed from ext3
627 *
628 * Returns: 0 or -ve on error
629 */
630
631static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
632 s64 change, struct gfs2_quota_data *qd,
633 struct fs_disk_quota *fdq)
634{
635 struct inode *inode = &ip->i_inode;
636 struct gfs2_sbd *sdp = GFS2_SB(inode);
637 struct address_space *mapping = inode->i_mapping;
638 unsigned long index = loc >> PAGE_CACHE_SHIFT;
639 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
640 unsigned blocksize, iblock, pos;
641 struct buffer_head *bh;
642 struct page *page;
643 void *kaddr, *ptr;
644 struct gfs2_quota q, *qp;
645 int err, nbytes;
646 u64 size;
647
648 if (gfs2_is_stuffed(ip)) {
649 err = gfs2_unstuff_dinode(ip, NULL);
650 if (err)
651 return err;
652 }
653
654 memset(&q, 0, sizeof(struct gfs2_quota));
655 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
656 if (err < 0)
657 return err;
658
659 err = -EIO;
660 qp = &q;
661 qp->qu_value = be64_to_cpu(qp->qu_value);
662 qp->qu_value += change;
663 qp->qu_value = cpu_to_be64(qp->qu_value);
664 qd->qd_qb.qb_value = qp->qu_value;
665 if (fdq) {
666 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
667 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
668 qd->qd_qb.qb_warn = qp->qu_warn;
669 }
670 if (fdq->d_fieldmask & FS_DQ_BHARD) {
671 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
672 qd->qd_qb.qb_limit = qp->qu_limit;
673 }
674 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
675 qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
676 qd->qd_qb.qb_value = qp->qu_value;
677 }
678 }
679
680 /* Write the quota into the quota file on disk */
681 ptr = qp;
682 nbytes = sizeof(struct gfs2_quota);
683get_a_page:
684 page = find_or_create_page(mapping, index, GFP_NOFS);
685 if (!page)
686 return -ENOMEM;
687
688 blocksize = inode->i_sb->s_blocksize;
689 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
690
691 if (!page_has_buffers(page))
692 create_empty_buffers(page, blocksize, 0);
693
694 bh = page_buffers(page);
695 pos = blocksize;
696 while (offset >= pos) {
697 bh = bh->b_this_page;
698 iblock++;
699 pos += blocksize;
700 }
701
702 if (!buffer_mapped(bh)) {
703 gfs2_block_map(inode, iblock, bh, 1);
704 if (!buffer_mapped(bh))
705 goto unlock_out;
706 /* If it's a newly allocated disk block for quota, zero it */
707 if (buffer_new(bh))
708 zero_user(page, pos - blocksize, bh->b_size);
709 }
710
711 if (PageUptodate(page))
712 set_buffer_uptodate(bh);
713
714 if (!buffer_uptodate(bh)) {
715 ll_rw_block(READ | REQ_META, 1, &bh);
716 wait_on_buffer(bh);
717 if (!buffer_uptodate(bh))
718 goto unlock_out;
719 }
720
721 gfs2_trans_add_bh(ip->i_gl, bh, 0);
722
723 kaddr = kmap_atomic(page);
724 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
725 nbytes = PAGE_CACHE_SIZE - offset;
726 memcpy(kaddr + offset, ptr, nbytes);
727 flush_dcache_page(page);
728 kunmap_atomic(kaddr);
729 unlock_page(page);
730 page_cache_release(page);
731
732 /* If quota straddles page boundary, we need to update the rest of the
733 * quota at the beginning of the next page */
734 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
735 ptr = ptr + nbytes;
736 nbytes = sizeof(struct gfs2_quota) - nbytes;
737 offset = 0;
738 index++;
739 goto get_a_page;
740 }
741
742 size = loc + sizeof(struct gfs2_quota);
743 if (size > inode->i_size)
744 i_size_write(inode, size);
745 inode->i_mtime = inode->i_atime = CURRENT_TIME;
746 mark_inode_dirty(inode);
747 return 0;
748
749unlock_out:
750 unlock_page(page);
751 page_cache_release(page);
752 return err;
753}
754
755static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
756{
757 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
758 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
759 unsigned int data_blocks, ind_blocks;
760 struct gfs2_holder *ghs, i_gh;
761 unsigned int qx, x;
762 struct gfs2_quota_data *qd;
763 loff_t offset;
764 unsigned int nalloc = 0, blocks;
765 int error;
766
767 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
768 &data_blocks, &ind_blocks);
769
770 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
771 if (!ghs)
772 return -ENOMEM;
773
774 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
775 mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);
776 for (qx = 0; qx < num_qd; qx++) {
777 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
778 GL_NOCACHE, &ghs[qx]);
779 if (error)
780 goto out;
781 }
782
783 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
784 if (error)
785 goto out;
786
787 for (x = 0; x < num_qd; x++) {
788 offset = qd2offset(qda[x]);
789 if (gfs2_write_alloc_required(ip, offset,
790 sizeof(struct gfs2_quota)))
791 nalloc++;
792 }
793
794 /*
795 * 1 blk for unstuffing inode if stuffed. We add this extra
796 * block to the reservation unconditionally. If the inode
797 * doesn't need unstuffing, the block will be released to the
798 * rgrp since it won't be allocated during the transaction
799 */
800 /* +3 in the end for unstuffing block, inode size update block
801 * and another block in case quota straddles page boundary and
802 * two blocks need to be updated instead of 1 */
803 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
804
805 error = gfs2_inplace_reserve(ip, 1 +
806 (nalloc * (data_blocks + ind_blocks)));
807 if (error)
808 goto out_alloc;
809
810 if (nalloc)
811 blocks += gfs2_rg_blocks(ip) + nalloc * ind_blocks + RES_STATFS;
812
813 error = gfs2_trans_begin(sdp, blocks, 0);
814 if (error)
815 goto out_ipres;
816
817 for (x = 0; x < num_qd; x++) {
818 qd = qda[x];
819 offset = qd2offset(qd);
820 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
821 if (error)
822 goto out_end_trans;
823
824 do_qc(qd, -qd->qd_change_sync);
825 set_bit(QDF_REFRESH, &qd->qd_flags);
826 }
827
828 error = 0;
829
830out_end_trans:
831 gfs2_trans_end(sdp);
832out_ipres:
833 gfs2_inplace_release(ip);
834out_alloc:
835 gfs2_glock_dq_uninit(&i_gh);
836out:
837 while (qx--)
838 gfs2_glock_dq_uninit(&ghs[qx]);
839 mutex_unlock(&ip->i_inode.i_mutex);
840 kfree(ghs);
841 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
842 return error;
843}
844
845static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
846{
847 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
848 struct gfs2_quota q;
849 struct gfs2_quota_lvb *qlvb;
850 loff_t pos;
851 int error;
852
853 memset(&q, 0, sizeof(struct gfs2_quota));
854 pos = qd2offset(qd);
855 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
856 if (error < 0)
857 return error;
858
859 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
860 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
861 qlvb->__pad = 0;
862 qlvb->qb_limit = q.qu_limit;
863 qlvb->qb_warn = q.qu_warn;
864 qlvb->qb_value = q.qu_value;
865 qd->qd_qb = *qlvb;
866
867 return 0;
868}
869
870static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
871 struct gfs2_holder *q_gh)
872{
873 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
874 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
875 struct gfs2_holder i_gh;
876 int error;
877
878restart:
879 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
880 if (error)
881 return error;
882
883 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
884
885 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
886 gfs2_glock_dq_uninit(q_gh);
887 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
888 GL_NOCACHE, q_gh);
889 if (error)
890 return error;
891
892 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
893 if (error)
894 goto fail;
895
896 error = update_qd(sdp, qd);
897 if (error)
898 goto fail_gunlock;
899
900 gfs2_glock_dq_uninit(&i_gh);
901 gfs2_glock_dq_uninit(q_gh);
902 force_refresh = 0;
903 goto restart;
904 }
905
906 return 0;
907
908fail_gunlock:
909 gfs2_glock_dq_uninit(&i_gh);
910fail:
911 gfs2_glock_dq_uninit(q_gh);
912 return error;
913}
914
915int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
916{
917 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
918 struct gfs2_qadata *qa = ip->i_qadata;
919 struct gfs2_quota_data *qd;
920 unsigned int x;
921 int error = 0;
922
923 error = gfs2_quota_hold(ip, uid, gid);
924 if (error)
925 return error;
926
927 if (capable(CAP_SYS_RESOURCE) ||
928 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
929 return 0;
930
931 sort(qa->qa_qd, qa->qa_qd_num, sizeof(struct gfs2_quota_data *),
932 sort_qd, NULL);
933
934 for (x = 0; x < qa->qa_qd_num; x++) {
935 int force = NO_FORCE;
936 qd = qa->qa_qd[x];
937 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
938 force = FORCE;
939 error = do_glock(qd, force, &qa->qa_qd_ghs[x]);
940 if (error)
941 break;
942 }
943
944 if (!error)
945 set_bit(GIF_QD_LOCKED, &ip->i_flags);
946 else {
947 while (x--)
948 gfs2_glock_dq_uninit(&qa->qa_qd_ghs[x]);
949 gfs2_quota_unhold(ip);
950 }
951
952 return error;
953}
954
955static int need_sync(struct gfs2_quota_data *qd)
956{
957 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
958 struct gfs2_tune *gt = &sdp->sd_tune;
959 s64 value;
960 unsigned int num, den;
961 int do_sync = 1;
962
963 if (!qd->qd_qb.qb_limit)
964 return 0;
965
966 spin_lock(&qd_lru_lock);
967 value = qd->qd_change;
968 spin_unlock(&qd_lru_lock);
969
970 spin_lock(>->gt_spin);
971 num = gt->gt_quota_scale_num;
972 den = gt->gt_quota_scale_den;
973 spin_unlock(>->gt_spin);
974
975 if (value < 0)
976 do_sync = 0;
977 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
978 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
979 do_sync = 0;
980 else {
981 value *= gfs2_jindex_size(sdp) * num;
982 value = div_s64(value, den);
983 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
984 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
985 do_sync = 0;
986 }
987
988 return do_sync;
989}
990
991void gfs2_quota_unlock(struct gfs2_inode *ip)
992{
993 struct gfs2_qadata *qa = ip->i_qadata;
994 struct gfs2_quota_data *qda[4];
995 unsigned int count = 0;
996 unsigned int x;
997
998 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
999 goto out;
1000
1001 for (x = 0; x < qa->qa_qd_num; x++) {
1002 struct gfs2_quota_data *qd;
1003 int sync;
1004
1005 qd = qa->qa_qd[x];
1006 sync = need_sync(qd);
1007
1008 gfs2_glock_dq_uninit(&qa->qa_qd_ghs[x]);
1009
1010 if (sync && qd_trylock(qd))
1011 qda[count++] = qd;
1012 }
1013
1014 if (count) {
1015 do_sync(count, qda);
1016 for (x = 0; x < count; x++)
1017 qd_unlock(qda[x]);
1018 }
1019
1020out:
1021 gfs2_quota_unhold(ip);
1022}
1023
1024#define MAX_LINE 256
1025
1026static int print_message(struct gfs2_quota_data *qd, char *type)
1027{
1028 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1029
1030 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1031 sdp->sd_fsname, type,
1032 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1033 qd->qd_id);
1034
1035 return 0;
1036}
1037
1038int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1039{
1040 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1041 struct gfs2_qadata *qa = ip->i_qadata;
1042 struct gfs2_quota_data *qd;
1043 s64 value;
1044 unsigned int x;
1045 int error = 0;
1046
1047 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1048 return 0;
1049
1050 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1051 return 0;
1052
1053 for (x = 0; x < qa->qa_qd_num; x++) {
1054 qd = qa->qa_qd[x];
1055
1056 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1057 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1058 continue;
1059
1060 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1061 spin_lock(&qd_lru_lock);
1062 value += qd->qd_change;
1063 spin_unlock(&qd_lru_lock);
1064
1065 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1066 print_message(qd, "exceeded");
1067 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1068 USRQUOTA : GRPQUOTA, qd->qd_id,
1069 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1070
1071 error = -EDQUOT;
1072 break;
1073 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1074 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1075 time_after_eq(jiffies, qd->qd_last_warn +
1076 gfs2_tune_get(sdp,
1077 gt_quota_warn_period) * HZ)) {
1078 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1079 USRQUOTA : GRPQUOTA, qd->qd_id,
1080 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1081 error = print_message(qd, "warning");
1082 qd->qd_last_warn = jiffies;
1083 }
1084 }
1085
1086 return error;
1087}
1088
1089void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1090 u32 uid, u32 gid)
1091{
1092 struct gfs2_qadata *qa = ip->i_qadata;
1093 struct gfs2_quota_data *qd;
1094 unsigned int x;
1095
1096 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1097 return;
1098 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1099 return;
1100
1101 for (x = 0; x < qa->qa_qd_num; x++) {
1102 qd = qa->qa_qd[x];
1103
1104 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1105 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1106 do_qc(qd, change);
1107 }
1108 }
1109}
1110
1111int gfs2_quota_sync(struct super_block *sb, int type, int wait)
1112{
1113 struct gfs2_sbd *sdp = sb->s_fs_info;
1114 struct gfs2_quota_data **qda;
1115 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1116 unsigned int num_qd;
1117 unsigned int x;
1118 int error = 0;
1119
1120 sdp->sd_quota_sync_gen++;
1121
1122 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1123 if (!qda)
1124 return -ENOMEM;
1125
1126 do {
1127 num_qd = 0;
1128
1129 for (;;) {
1130 error = qd_fish(sdp, qda + num_qd);
1131 if (error || !qda[num_qd])
1132 break;
1133 if (++num_qd == max_qd)
1134 break;
1135 }
1136
1137 if (num_qd) {
1138 if (!error)
1139 error = do_sync(num_qd, qda);
1140 if (!error)
1141 for (x = 0; x < num_qd; x++)
1142 qda[x]->qd_sync_gen =
1143 sdp->sd_quota_sync_gen;
1144
1145 for (x = 0; x < num_qd; x++)
1146 qd_unlock(qda[x]);
1147 }
1148 } while (!error && num_qd == max_qd);
1149
1150 kfree(qda);
1151
1152 return error;
1153}
1154
1155static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1156{
1157 return gfs2_quota_sync(sb, type, 0);
1158}
1159
1160int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1161{
1162 struct gfs2_quota_data *qd;
1163 struct gfs2_holder q_gh;
1164 int error;
1165
1166 error = qd_get(sdp, user, id, &qd);
1167 if (error)
1168 return error;
1169
1170 error = do_glock(qd, FORCE, &q_gh);
1171 if (!error)
1172 gfs2_glock_dq_uninit(&q_gh);
1173
1174 qd_put(qd);
1175 return error;
1176}
1177
1178static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1179{
1180 const struct gfs2_quota_change *str = buf;
1181
1182 qc->qc_change = be64_to_cpu(str->qc_change);
1183 qc->qc_flags = be32_to_cpu(str->qc_flags);
1184 qc->qc_id = be32_to_cpu(str->qc_id);
1185}
1186
1187int gfs2_quota_init(struct gfs2_sbd *sdp)
1188{
1189 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1190 u64 size = i_size_read(sdp->sd_qc_inode);
1191 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1192 unsigned int x, slot = 0;
1193 unsigned int found = 0;
1194 u64 dblock;
1195 u32 extlen = 0;
1196 int error;
1197
1198 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1199 return -EIO;
1200
1201 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1202 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1203
1204 error = -ENOMEM;
1205
1206 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1207 sizeof(unsigned char *), GFP_NOFS);
1208 if (!sdp->sd_quota_bitmap)
1209 return error;
1210
1211 for (x = 0; x < sdp->sd_quota_chunks; x++) {
1212 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1213 if (!sdp->sd_quota_bitmap[x])
1214 goto fail;
1215 }
1216
1217 for (x = 0; x < blocks; x++) {
1218 struct buffer_head *bh;
1219 unsigned int y;
1220
1221 if (!extlen) {
1222 int new = 0;
1223 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1224 if (error)
1225 goto fail;
1226 }
1227 error = -EIO;
1228 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1229 if (!bh)
1230 goto fail;
1231 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1232 brelse(bh);
1233 goto fail;
1234 }
1235
1236 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1237 y++, slot++) {
1238 struct gfs2_quota_change_host qc;
1239 struct gfs2_quota_data *qd;
1240
1241 gfs2_quota_change_in(&qc, bh->b_data +
1242 sizeof(struct gfs2_meta_header) +
1243 y * sizeof(struct gfs2_quota_change));
1244 if (!qc.qc_change)
1245 continue;
1246
1247 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1248 qc.qc_id, &qd);
1249 if (error) {
1250 brelse(bh);
1251 goto fail;
1252 }
1253
1254 set_bit(QDF_CHANGE, &qd->qd_flags);
1255 qd->qd_change = qc.qc_change;
1256 qd->qd_slot = slot;
1257 qd->qd_slot_count = 1;
1258
1259 spin_lock(&qd_lru_lock);
1260 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1261 list_add(&qd->qd_list, &sdp->sd_quota_list);
1262 atomic_inc(&sdp->sd_quota_count);
1263 spin_unlock(&qd_lru_lock);
1264
1265 found++;
1266 }
1267
1268 brelse(bh);
1269 dblock++;
1270 extlen--;
1271 }
1272
1273 if (found)
1274 fs_info(sdp, "found %u quota changes\n", found);
1275
1276 return 0;
1277
1278fail:
1279 gfs2_quota_cleanup(sdp);
1280 return error;
1281}
1282
1283void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1284{
1285 struct list_head *head = &sdp->sd_quota_list;
1286 struct gfs2_quota_data *qd;
1287 unsigned int x;
1288
1289 spin_lock(&qd_lru_lock);
1290 while (!list_empty(head)) {
1291 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1292
1293 if (atomic_read(&qd->qd_count) > 1 ||
1294 (atomic_read(&qd->qd_count) &&
1295 !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1296 list_move(&qd->qd_list, head);
1297 spin_unlock(&qd_lru_lock);
1298 schedule();
1299 spin_lock(&qd_lru_lock);
1300 continue;
1301 }
1302
1303 list_del(&qd->qd_list);
1304 /* Also remove if this qd exists in the reclaim list */
1305 if (!list_empty(&qd->qd_reclaim)) {
1306 list_del_init(&qd->qd_reclaim);
1307 atomic_dec(&qd_lru_count);
1308 }
1309 atomic_dec(&sdp->sd_quota_count);
1310 spin_unlock(&qd_lru_lock);
1311
1312 if (!atomic_read(&qd->qd_count)) {
1313 gfs2_assert_warn(sdp, !qd->qd_change);
1314 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1315 } else
1316 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1317 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1318
1319 gfs2_glock_put(qd->qd_gl);
1320 kmem_cache_free(gfs2_quotad_cachep, qd);
1321
1322 spin_lock(&qd_lru_lock);
1323 }
1324 spin_unlock(&qd_lru_lock);
1325
1326 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1327
1328 if (sdp->sd_quota_bitmap) {
1329 for (x = 0; x < sdp->sd_quota_chunks; x++)
1330 kfree(sdp->sd_quota_bitmap[x]);
1331 kfree(sdp->sd_quota_bitmap);
1332 }
1333}
1334
1335static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1336{
1337 if (error == 0 || error == -EROFS)
1338 return;
1339 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1340 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1341}
1342
1343static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1344 int (*fxn)(struct super_block *sb, int type),
1345 unsigned long t, unsigned long *timeo,
1346 unsigned int *new_timeo)
1347{
1348 if (t >= *timeo) {
1349 int error = fxn(sdp->sd_vfs, 0);
1350 quotad_error(sdp, msg, error);
1351 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1352 } else {
1353 *timeo -= t;
1354 }
1355}
1356
1357static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1358{
1359 struct gfs2_inode *ip;
1360
1361 while(1) {
1362 ip = NULL;
1363 spin_lock(&sdp->sd_trunc_lock);
1364 if (!list_empty(&sdp->sd_trunc_list)) {
1365 ip = list_entry(sdp->sd_trunc_list.next,
1366 struct gfs2_inode, i_trunc_list);
1367 list_del_init(&ip->i_trunc_list);
1368 }
1369 spin_unlock(&sdp->sd_trunc_lock);
1370 if (ip == NULL)
1371 return;
1372 gfs2_glock_finish_truncate(ip);
1373 }
1374}
1375
1376void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1377 if (!sdp->sd_statfs_force_sync) {
1378 sdp->sd_statfs_force_sync = 1;
1379 wake_up(&sdp->sd_quota_wait);
1380 }
1381}
1382
1383
1384/**
1385 * gfs2_quotad - Write cached quota changes into the quota file
1386 * @sdp: Pointer to GFS2 superblock
1387 *
1388 */
1389
1390int gfs2_quotad(void *data)
1391{
1392 struct gfs2_sbd *sdp = data;
1393 struct gfs2_tune *tune = &sdp->sd_tune;
1394 unsigned long statfs_timeo = 0;
1395 unsigned long quotad_timeo = 0;
1396 unsigned long t = 0;
1397 DEFINE_WAIT(wait);
1398 int empty;
1399
1400 while (!kthread_should_stop()) {
1401
1402 /* Update the master statfs file */
1403 if (sdp->sd_statfs_force_sync) {
1404 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1405 quotad_error(sdp, "statfs", error);
1406 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1407 }
1408 else
1409 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1410 &statfs_timeo,
1411 &tune->gt_statfs_quantum);
1412
1413 /* Update quota file */
1414 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1415 "ad_timeo, &tune->gt_quota_quantum);
1416
1417 /* Check for & recover partially truncated inodes */
1418 quotad_check_trunc_list(sdp);
1419
1420 try_to_freeze();
1421
1422 t = min(quotad_timeo, statfs_timeo);
1423
1424 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1425 spin_lock(&sdp->sd_trunc_lock);
1426 empty = list_empty(&sdp->sd_trunc_list);
1427 spin_unlock(&sdp->sd_trunc_lock);
1428 if (empty && !sdp->sd_statfs_force_sync)
1429 t -= schedule_timeout(t);
1430 else
1431 t = 0;
1432 finish_wait(&sdp->sd_quota_wait, &wait);
1433 }
1434
1435 return 0;
1436}
1437
1438static int gfs2_quota_get_xstate(struct super_block *sb,
1439 struct fs_quota_stat *fqs)
1440{
1441 struct gfs2_sbd *sdp = sb->s_fs_info;
1442
1443 memset(fqs, 0, sizeof(struct fs_quota_stat));
1444 fqs->qs_version = FS_QSTAT_VERSION;
1445
1446 switch (sdp->sd_args.ar_quota) {
1447 case GFS2_QUOTA_ON:
1448 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1449 /*FALLTHRU*/
1450 case GFS2_QUOTA_ACCOUNT:
1451 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1452 break;
1453 case GFS2_QUOTA_OFF:
1454 break;
1455 }
1456
1457 if (sdp->sd_quota_inode) {
1458 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1459 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1460 }
1461 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1462 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1463 fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1464 return 0;
1465}
1466
1467static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id,
1468 struct fs_disk_quota *fdq)
1469{
1470 struct gfs2_sbd *sdp = sb->s_fs_info;
1471 struct gfs2_quota_lvb *qlvb;
1472 struct gfs2_quota_data *qd;
1473 struct gfs2_holder q_gh;
1474 int error;
1475
1476 memset(fdq, 0, sizeof(struct fs_disk_quota));
1477
1478 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1479 return -ESRCH; /* Crazy XFS error code */
1480
1481 if (type == USRQUOTA)
1482 type = QUOTA_USER;
1483 else if (type == GRPQUOTA)
1484 type = QUOTA_GROUP;
1485 else
1486 return -EINVAL;
1487
1488 error = qd_get(sdp, type, id, &qd);
1489 if (error)
1490 return error;
1491 error = do_glock(qd, FORCE, &q_gh);
1492 if (error)
1493 goto out;
1494
1495 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1496 fdq->d_version = FS_DQUOT_VERSION;
1497 fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1498 fdq->d_id = id;
1499 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1500 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1501 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1502
1503 gfs2_glock_dq_uninit(&q_gh);
1504out:
1505 qd_put(qd);
1506 return error;
1507}
1508
1509/* GFS2 only supports a subset of the XFS fields */
1510#define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1511
1512static int gfs2_set_dqblk(struct super_block *sb, int type, qid_t id,
1513 struct fs_disk_quota *fdq)
1514{
1515 struct gfs2_sbd *sdp = sb->s_fs_info;
1516 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1517 struct gfs2_quota_data *qd;
1518 struct gfs2_holder q_gh, i_gh;
1519 unsigned int data_blocks, ind_blocks;
1520 unsigned int blocks = 0;
1521 int alloc_required;
1522 loff_t offset;
1523 int error;
1524
1525 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1526 return -ESRCH; /* Crazy XFS error code */
1527
1528 switch(type) {
1529 case USRQUOTA:
1530 type = QUOTA_USER;
1531 if (fdq->d_flags != FS_USER_QUOTA)
1532 return -EINVAL;
1533 break;
1534 case GRPQUOTA:
1535 type = QUOTA_GROUP;
1536 if (fdq->d_flags != FS_GROUP_QUOTA)
1537 return -EINVAL;
1538 break;
1539 default:
1540 return -EINVAL;
1541 }
1542
1543 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1544 return -EINVAL;
1545 if (fdq->d_id != id)
1546 return -EINVAL;
1547
1548 error = qd_get(sdp, type, id, &qd);
1549 if (error)
1550 return error;
1551
1552 mutex_lock(&ip->i_inode.i_mutex);
1553 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1554 if (error)
1555 goto out_put;
1556 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1557 if (error)
1558 goto out_q;
1559
1560 /* Check for existing entry, if none then alloc new blocks */
1561 error = update_qd(sdp, qd);
1562 if (error)
1563 goto out_i;
1564
1565 /* If nothing has changed, this is a no-op */
1566 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1567 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1568 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1569
1570 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1571 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1572 fdq->d_fieldmask ^= FS_DQ_BHARD;
1573
1574 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1575 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1576 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1577
1578 if (fdq->d_fieldmask == 0)
1579 goto out_i;
1580
1581 offset = qd2offset(qd);
1582 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1583 if (gfs2_is_stuffed(ip))
1584 alloc_required = 1;
1585 if (alloc_required) {
1586 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1587 &data_blocks, &ind_blocks);
1588 blocks = 1 + data_blocks + ind_blocks;
1589 error = gfs2_inplace_reserve(ip, blocks);
1590 if (error)
1591 goto out_i;
1592 blocks += gfs2_rg_blocks(ip);
1593 }
1594
1595 /* Some quotas span block boundaries and can update two blocks,
1596 adding an extra block to the transaction to handle such quotas */
1597 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1598 if (error)
1599 goto out_release;
1600
1601 /* Apply changes */
1602 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1603
1604 gfs2_trans_end(sdp);
1605out_release:
1606 if (alloc_required)
1607 gfs2_inplace_release(ip);
1608out_i:
1609 gfs2_glock_dq_uninit(&i_gh);
1610out_q:
1611 gfs2_glock_dq_uninit(&q_gh);
1612out_put:
1613 mutex_unlock(&ip->i_inode.i_mutex);
1614 qd_put(qd);
1615 return error;
1616}
1617
1618const struct quotactl_ops gfs2_quotactl_ops = {
1619 .quota_sync = gfs2_quota_sync,
1620 .get_xstate = gfs2_quota_get_xstate,
1621 .get_dqblk = gfs2_get_dqblk,
1622 .set_dqblk = gfs2_set_dqblk,
1623};