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Linux 3.17-rc2
[linux/fpc-iii.git] / fs / gfs2 / quota.c
blob64b29f7f6b4ce7ab8a7b0f5bb75430d80515ae15
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 */
83 static DEFINE_SPINLOCK(qd_lock);
84 struct list_lru gfs2_qd_lru;
85
86 static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
87
88 static 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
99 static inline void spin_lock_bucket(unsigned int hash)
100 {
101 hlist_bl_lock(&qd_hash_table[hash]);
102 }
103
104 static inline void spin_unlock_bucket(unsigned int hash)
105 {
106 hlist_bl_unlock(&qd_hash_table[hash]);
107 }
108
109 static 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
115 static void gfs2_qd_dispose(struct list_head *list)
116 {
117 struct gfs2_quota_data *qd;
118 struct gfs2_sbd *sdp;
119
120 while (!list_empty(list)) {
121 qd = list_entry(list->next, struct gfs2_quota_data, qd_lru);
122 sdp = qd->qd_gl->gl_sbd;
123
124 list_del(&qd->qd_lru);
125
126 /* Free from the filesystem-specific list */
127 spin_lock(&qd_lock);
128 list_del(&qd->qd_list);
129 spin_unlock(&qd_lock);
130
131 spin_lock_bucket(qd->qd_hash);
132 hlist_bl_del_rcu(&qd->qd_hlist);
133 spin_unlock_bucket(qd->qd_hash);
134
135 gfs2_assert_warn(sdp, !qd->qd_change);
136 gfs2_assert_warn(sdp, !qd->qd_slot_count);
137 gfs2_assert_warn(sdp, !qd->qd_bh_count);
138
139 gfs2_glock_put(qd->qd_gl);
140 atomic_dec(&sdp->sd_quota_count);
141
142 /* Delete it from the common reclaim list */
143 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
144 }
145 }
146
147
148 static enum lru_status gfs2_qd_isolate(struct list_head *item, spinlock_t *lock, void *arg)
149 {
150 struct list_head *dispose = arg;
151 struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
152
153 if (!spin_trylock(&qd->qd_lockref.lock))
154 return LRU_SKIP;
155
156 if (qd->qd_lockref.count == 0) {
157 lockref_mark_dead(&qd->qd_lockref);
158 list_move(&qd->qd_lru, dispose);
159 }
160
161 spin_unlock(&qd->qd_lockref.lock);
162 return LRU_REMOVED;
163 }
164
165 static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
166 struct shrink_control *sc)
167 {
168 LIST_HEAD(dispose);
169 unsigned long freed;
170
171 if (!(sc->gfp_mask & __GFP_FS))
172 return SHRINK_STOP;
173
174 freed = list_lru_walk_node(&gfs2_qd_lru, sc->nid, gfs2_qd_isolate,
175 &dispose, &sc->nr_to_scan);
176
177 gfs2_qd_dispose(&dispose);
178
179 return freed;
180 }
181
182 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
183 struct shrink_control *sc)
184 {
185 return vfs_pressure_ratio(list_lru_count_node(&gfs2_qd_lru, sc->nid));
186 }
187
188 struct shrinker gfs2_qd_shrinker = {
189 .count_objects = gfs2_qd_shrink_count,
190 .scan_objects = gfs2_qd_shrink_scan,
191 .seeks = DEFAULT_SEEKS,
192 .flags = SHRINKER_NUMA_AWARE,
193 };
194
195
196 static u64 qd2index(struct gfs2_quota_data *qd)
197 {
198 struct kqid qid = qd->qd_id;
199 return (2 * (u64)from_kqid(&init_user_ns, qid)) +
200 ((qid.type == USRQUOTA) ? 0 : 1);
201 }
202
203 static u64 qd2offset(struct gfs2_quota_data *qd)
204 {
205 u64 offset;
206
207 offset = qd2index(qd);
208 offset *= sizeof(struct gfs2_quota);
209
210 return offset;
211 }
212
213 static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
214 {
215 struct gfs2_quota_data *qd;
216 int error;
217
218 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
219 if (!qd)
220 return NULL;
221
222 qd->qd_sbd = sdp;
223 qd->qd_lockref.count = 1;
224 spin_lock_init(&qd->qd_lockref.lock);
225 qd->qd_id = qid;
226 qd->qd_slot = -1;
227 INIT_LIST_HEAD(&qd->qd_lru);
228 qd->qd_hash = hash;
229
230 error = gfs2_glock_get(sdp, qd2index(qd),
231 &gfs2_quota_glops, CREATE, &qd->qd_gl);
232 if (error)
233 goto fail;
234
235 return qd;
236
237 fail:
238 kmem_cache_free(gfs2_quotad_cachep, qd);
239 return NULL;
240 }
241
242 static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
243 const struct gfs2_sbd *sdp,
244 struct kqid qid)
245 {
246 struct gfs2_quota_data *qd;
247 struct hlist_bl_node *h;
248
249 hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
250 if (!qid_eq(qd->qd_id, qid))
251 continue;
252 if (qd->qd_sbd != sdp)
253 continue;
254 if (lockref_get_not_dead(&qd->qd_lockref)) {
255 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
256 return qd;
257 }
258 }
259
260 return NULL;
261 }
262
263
264 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
265 struct gfs2_quota_data **qdp)
266 {
267 struct gfs2_quota_data *qd, *new_qd;
268 unsigned int hash = gfs2_qd_hash(sdp, qid);
269
270 rcu_read_lock();
271 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
272 rcu_read_unlock();
273
274 if (qd)
275 return 0;
276
277 new_qd = qd_alloc(hash, sdp, qid);
278 if (!new_qd)
279 return -ENOMEM;
280
281 spin_lock(&qd_lock);
282 spin_lock_bucket(hash);
283 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
284 if (qd == NULL) {
285 *qdp = new_qd;
286 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
287 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
288 atomic_inc(&sdp->sd_quota_count);
289 }
290 spin_unlock_bucket(hash);
291 spin_unlock(&qd_lock);
292
293 if (qd) {
294 gfs2_glock_put(new_qd->qd_gl);
295 kmem_cache_free(gfs2_quotad_cachep, new_qd);
296 }
297
298 return 0;
299 }
300
301
302 static void qd_hold(struct gfs2_quota_data *qd)
303 {
304 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
305 gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
306 lockref_get(&qd->qd_lockref);
307 }
308
309 static void qd_put(struct gfs2_quota_data *qd)
310 {
311 if (lockref_put_or_lock(&qd->qd_lockref))
312 return;
313
314 qd->qd_lockref.count = 0;
315 list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
316 spin_unlock(&qd->qd_lockref.lock);
317
318 }
319
320 static int slot_get(struct gfs2_quota_data *qd)
321 {
322 struct gfs2_sbd *sdp = qd->qd_sbd;
323 unsigned int bit;
324 int error = 0;
325
326 spin_lock(&sdp->sd_bitmap_lock);
327 if (qd->qd_slot_count != 0)
328 goto out;
329
330 error = -ENOSPC;
331 bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
332 if (bit < sdp->sd_quota_slots) {
333 set_bit(bit, sdp->sd_quota_bitmap);
334 qd->qd_slot = bit;
335 error = 0;
336 out:
337 qd->qd_slot_count++;
338 }
339 spin_unlock(&sdp->sd_bitmap_lock);
340
341 return error;
342 }
343
344 static void slot_hold(struct gfs2_quota_data *qd)
345 {
346 struct gfs2_sbd *sdp = qd->qd_sbd;
347
348 spin_lock(&sdp->sd_bitmap_lock);
349 gfs2_assert(sdp, qd->qd_slot_count);
350 qd->qd_slot_count++;
351 spin_unlock(&sdp->sd_bitmap_lock);
352 }
353
354 static void slot_put(struct gfs2_quota_data *qd)
355 {
356 struct gfs2_sbd *sdp = qd->qd_sbd;
357
358 spin_lock(&sdp->sd_bitmap_lock);
359 gfs2_assert(sdp, qd->qd_slot_count);
360 if (!--qd->qd_slot_count) {
361 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
362 qd->qd_slot = -1;
363 }
364 spin_unlock(&sdp->sd_bitmap_lock);
365 }
366
367 static int bh_get(struct gfs2_quota_data *qd)
368 {
369 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
370 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
371 unsigned int block, offset;
372 struct buffer_head *bh;
373 int error;
374 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
375
376 mutex_lock(&sdp->sd_quota_mutex);
377
378 if (qd->qd_bh_count++) {
379 mutex_unlock(&sdp->sd_quota_mutex);
380 return 0;
381 }
382
383 block = qd->qd_slot / sdp->sd_qc_per_block;
384 offset = qd->qd_slot % sdp->sd_qc_per_block;
385
386 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
387 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
388 if (error)
389 goto fail;
390 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
391 if (error)
392 goto fail;
393 error = -EIO;
394 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
395 goto fail_brelse;
396
397 qd->qd_bh = bh;
398 qd->qd_bh_qc = (struct gfs2_quota_change *)
399 (bh->b_data + sizeof(struct gfs2_meta_header) +
400 offset * sizeof(struct gfs2_quota_change));
401
402 mutex_unlock(&sdp->sd_quota_mutex);
403
404 return 0;
405
406 fail_brelse:
407 brelse(bh);
408 fail:
409 qd->qd_bh_count--;
410 mutex_unlock(&sdp->sd_quota_mutex);
411 return error;
412 }
413
414 static void bh_put(struct gfs2_quota_data *qd)
415 {
416 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
417
418 mutex_lock(&sdp->sd_quota_mutex);
419 gfs2_assert(sdp, qd->qd_bh_count);
420 if (!--qd->qd_bh_count) {
421 brelse(qd->qd_bh);
422 qd->qd_bh = NULL;
423 qd->qd_bh_qc = NULL;
424 }
425 mutex_unlock(&sdp->sd_quota_mutex);
426 }
427
428 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
429 u64 *sync_gen)
430 {
431 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
432 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
433 (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
434 return 0;
435
436 if (!lockref_get_not_dead(&qd->qd_lockref))
437 return 0;
438
439 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
440 set_bit(QDF_LOCKED, &qd->qd_flags);
441 qd->qd_change_sync = qd->qd_change;
442 slot_hold(qd);
443 return 1;
444 }
445
446 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
447 {
448 struct gfs2_quota_data *qd = NULL;
449 int error;
450 int found = 0;
451
452 *qdp = NULL;
453
454 if (sdp->sd_vfs->s_flags & MS_RDONLY)
455 return 0;
456
457 spin_lock(&qd_lock);
458
459 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
460 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
461 if (found)
462 break;
463 }
464
465 if (!found)
466 qd = NULL;
467
468 spin_unlock(&qd_lock);
469
470 if (qd) {
471 gfs2_assert_warn(sdp, qd->qd_change_sync);
472 error = bh_get(qd);
473 if (error) {
474 clear_bit(QDF_LOCKED, &qd->qd_flags);
475 slot_put(qd);
476 qd_put(qd);
477 return error;
478 }
479 }
480
481 *qdp = qd;
482
483 return 0;
484 }
485
486 static void qd_unlock(struct gfs2_quota_data *qd)
487 {
488 gfs2_assert_warn(qd->qd_gl->gl_sbd,
489 test_bit(QDF_LOCKED, &qd->qd_flags));
490 clear_bit(QDF_LOCKED, &qd->qd_flags);
491 bh_put(qd);
492 slot_put(qd);
493 qd_put(qd);
494 }
495
496 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
497 struct gfs2_quota_data **qdp)
498 {
499 int error;
500
501 error = qd_get(sdp, qid, qdp);
502 if (error)
503 return error;
504
505 error = slot_get(*qdp);
506 if (error)
507 goto fail;
508
509 error = bh_get(*qdp);
510 if (error)
511 goto fail_slot;
512
513 return 0;
514
515 fail_slot:
516 slot_put(*qdp);
517 fail:
518 qd_put(*qdp);
519 return error;
520 }
521
522 static void qdsb_put(struct gfs2_quota_data *qd)
523 {
524 bh_put(qd);
525 slot_put(qd);
526 qd_put(qd);
527 }
528
529 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
530 {
531 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
532 struct gfs2_quota_data **qd;
533 int error;
534
535 if (ip->i_res == NULL) {
536 error = gfs2_rs_alloc(ip);
537 if (error)
538 return error;
539 }
540
541 qd = ip->i_res->rs_qa_qd;
542
543 if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
544 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
545 return -EIO;
546
547 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
548 return 0;
549
550 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
551 if (error)
552 goto out;
553 ip->i_res->rs_qa_qd_num++;
554 qd++;
555
556 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
557 if (error)
558 goto out;
559 ip->i_res->rs_qa_qd_num++;
560 qd++;
561
562 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
563 !uid_eq(uid, ip->i_inode.i_uid)) {
564 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
565 if (error)
566 goto out;
567 ip->i_res->rs_qa_qd_num++;
568 qd++;
569 }
570
571 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
572 !gid_eq(gid, ip->i_inode.i_gid)) {
573 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
574 if (error)
575 goto out;
576 ip->i_res->rs_qa_qd_num++;
577 qd++;
578 }
579
580 out:
581 if (error)
582 gfs2_quota_unhold(ip);
583 return error;
584 }
585
586 void gfs2_quota_unhold(struct gfs2_inode *ip)
587 {
588 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
589 unsigned int x;
590
591 if (ip->i_res == NULL)
592 return;
593 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
594
595 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
596 qdsb_put(ip->i_res->rs_qa_qd[x]);
597 ip->i_res->rs_qa_qd[x] = NULL;
598 }
599 ip->i_res->rs_qa_qd_num = 0;
600 }
601
602 static int sort_qd(const void *a, const void *b)
603 {
604 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
605 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
606
607 if (qid_lt(qd_a->qd_id, qd_b->qd_id))
608 return -1;
609 if (qid_lt(qd_b->qd_id, qd_a->qd_id))
610 return 1;
611 return 0;
612 }
613
614 static void do_qc(struct gfs2_quota_data *qd, s64 change)
615 {
616 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
617 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
618 struct gfs2_quota_change *qc = qd->qd_bh_qc;
619 s64 x;
620
621 mutex_lock(&sdp->sd_quota_mutex);
622 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
623
624 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
625 qc->qc_change = 0;
626 qc->qc_flags = 0;
627 if (qd->qd_id.type == USRQUOTA)
628 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
629 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
630 }
631
632 x = be64_to_cpu(qc->qc_change) + change;
633 qc->qc_change = cpu_to_be64(x);
634
635 spin_lock(&qd_lock);
636 qd->qd_change = x;
637 spin_unlock(&qd_lock);
638
639 if (!x) {
640 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
641 clear_bit(QDF_CHANGE, &qd->qd_flags);
642 qc->qc_flags = 0;
643 qc->qc_id = 0;
644 slot_put(qd);
645 qd_put(qd);
646 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
647 qd_hold(qd);
648 slot_hold(qd);
649 }
650
651 mutex_unlock(&sdp->sd_quota_mutex);
652 }
653
654 /**
655 * gfs2_adjust_quota - adjust record of current block usage
656 * @ip: The quota inode
657 * @loc: Offset of the entry in the quota file
658 * @change: The amount of usage change to record
659 * @qd: The quota data
660 * @fdq: The updated limits to record
661 *
662 * This function was mostly borrowed from gfs2_block_truncate_page which was
663 * in turn mostly borrowed from ext3
664 *
665 * Returns: 0 or -ve on error
666 */
667
668 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
669 s64 change, struct gfs2_quota_data *qd,
670 struct fs_disk_quota *fdq)
671 {
672 struct inode *inode = &ip->i_inode;
673 struct gfs2_sbd *sdp = GFS2_SB(inode);
674 struct address_space *mapping = inode->i_mapping;
675 unsigned long index = loc >> PAGE_CACHE_SHIFT;
676 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
677 unsigned blocksize, iblock, pos;
678 struct buffer_head *bh;
679 struct page *page;
680 void *kaddr, *ptr;
681 struct gfs2_quota q;
682 int err, nbytes;
683 u64 size;
684
685 if (gfs2_is_stuffed(ip)) {
686 err = gfs2_unstuff_dinode(ip, NULL);
687 if (err)
688 return err;
689 }
690
691 memset(&q, 0, sizeof(struct gfs2_quota));
692 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
693 if (err < 0)
694 return err;
695
696 err = -EIO;
697 be64_add_cpu(&q.qu_value, change);
698 qd->qd_qb.qb_value = q.qu_value;
699 if (fdq) {
700 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
701 q.qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
702 qd->qd_qb.qb_warn = q.qu_warn;
703 }
704 if (fdq->d_fieldmask & FS_DQ_BHARD) {
705 q.qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
706 qd->qd_qb.qb_limit = q.qu_limit;
707 }
708 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
709 q.qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
710 qd->qd_qb.qb_value = q.qu_value;
711 }
712 }
713
714 /* Write the quota into the quota file on disk */
715 ptr = &q;
716 nbytes = sizeof(struct gfs2_quota);
717 get_a_page:
718 page = find_or_create_page(mapping, index, GFP_NOFS);
719 if (!page)
720 return -ENOMEM;
721
722 blocksize = inode->i_sb->s_blocksize;
723 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
724
725 if (!page_has_buffers(page))
726 create_empty_buffers(page, blocksize, 0);
727
728 bh = page_buffers(page);
729 pos = blocksize;
730 while (offset >= pos) {
731 bh = bh->b_this_page;
732 iblock++;
733 pos += blocksize;
734 }
735
736 if (!buffer_mapped(bh)) {
737 gfs2_block_map(inode, iblock, bh, 1);
738 if (!buffer_mapped(bh))
739 goto unlock_out;
740 /* If it's a newly allocated disk block for quota, zero it */
741 if (buffer_new(bh))
742 zero_user(page, pos - blocksize, bh->b_size);
743 }
744
745 if (PageUptodate(page))
746 set_buffer_uptodate(bh);
747
748 if (!buffer_uptodate(bh)) {
749 ll_rw_block(READ | REQ_META, 1, &bh);
750 wait_on_buffer(bh);
751 if (!buffer_uptodate(bh))
752 goto unlock_out;
753 }
754
755 gfs2_trans_add_data(ip->i_gl, bh);
756
757 kaddr = kmap_atomic(page);
758 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
759 nbytes = PAGE_CACHE_SIZE - offset;
760 memcpy(kaddr + offset, ptr, nbytes);
761 flush_dcache_page(page);
762 kunmap_atomic(kaddr);
763 unlock_page(page);
764 page_cache_release(page);
765
766 /* If quota straddles page boundary, we need to update the rest of the
767 * quota at the beginning of the next page */
768 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
769 ptr = ptr + nbytes;
770 nbytes = sizeof(struct gfs2_quota) - nbytes;
771 offset = 0;
772 index++;
773 goto get_a_page;
774 }
775
776 size = loc + sizeof(struct gfs2_quota);
777 if (size > inode->i_size)
778 i_size_write(inode, size);
779 inode->i_mtime = inode->i_atime = CURRENT_TIME;
780 mark_inode_dirty(inode);
781 set_bit(QDF_REFRESH, &qd->qd_flags);
782 return 0;
783
784 unlock_out:
785 unlock_page(page);
786 page_cache_release(page);
787 return err;
788 }
789
790 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
791 {
792 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
793 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
794 struct gfs2_alloc_parms ap = { .aflags = 0, };
795 unsigned int data_blocks, ind_blocks;
796 struct gfs2_holder *ghs, i_gh;
797 unsigned int qx, x;
798 struct gfs2_quota_data *qd;
799 unsigned reserved;
800 loff_t offset;
801 unsigned int nalloc = 0, blocks;
802 int error;
803
804 error = gfs2_rs_alloc(ip);
805 if (error)
806 return error;
807
808 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
809 &data_blocks, &ind_blocks);
810
811 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
812 if (!ghs)
813 return -ENOMEM;
814
815 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
816 mutex_lock(&ip->i_inode.i_mutex);
817 for (qx = 0; qx < num_qd; qx++) {
818 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
819 GL_NOCACHE, &ghs[qx]);
820 if (error)
821 goto out;
822 }
823
824 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
825 if (error)
826 goto out;
827
828 for (x = 0; x < num_qd; x++) {
829 offset = qd2offset(qda[x]);
830 if (gfs2_write_alloc_required(ip, offset,
831 sizeof(struct gfs2_quota)))
832 nalloc++;
833 }
834
835 /*
836 * 1 blk for unstuffing inode if stuffed. We add this extra
837 * block to the reservation unconditionally. If the inode
838 * doesn't need unstuffing, the block will be released to the
839 * rgrp since it won't be allocated during the transaction
840 */
841 /* +3 in the end for unstuffing block, inode size update block
842 * and another block in case quota straddles page boundary and
843 * two blocks need to be updated instead of 1 */
844 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
845
846 reserved = 1 + (nalloc * (data_blocks + ind_blocks));
847 ap.target = reserved;
848 error = gfs2_inplace_reserve(ip, &ap);
849 if (error)
850 goto out_alloc;
851
852 if (nalloc)
853 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
854
855 error = gfs2_trans_begin(sdp, blocks, 0);
856 if (error)
857 goto out_ipres;
858
859 for (x = 0; x < num_qd; x++) {
860 qd = qda[x];
861 offset = qd2offset(qd);
862 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
863 if (error)
864 goto out_end_trans;
865
866 do_qc(qd, -qd->qd_change_sync);
867 set_bit(QDF_REFRESH, &qd->qd_flags);
868 }
869
870 error = 0;
871
872 out_end_trans:
873 gfs2_trans_end(sdp);
874 out_ipres:
875 gfs2_inplace_release(ip);
876 out_alloc:
877 gfs2_glock_dq_uninit(&i_gh);
878 out:
879 while (qx--)
880 gfs2_glock_dq_uninit(&ghs[qx]);
881 mutex_unlock(&ip->i_inode.i_mutex);
882 kfree(ghs);
883 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl, NORMAL_FLUSH);
884 return error;
885 }
886
887 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
888 {
889 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
890 struct gfs2_quota q;
891 struct gfs2_quota_lvb *qlvb;
892 loff_t pos;
893 int error;
894
895 memset(&q, 0, sizeof(struct gfs2_quota));
896 pos = qd2offset(qd);
897 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
898 if (error < 0)
899 return error;
900
901 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
902 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
903 qlvb->__pad = 0;
904 qlvb->qb_limit = q.qu_limit;
905 qlvb->qb_warn = q.qu_warn;
906 qlvb->qb_value = q.qu_value;
907 qd->qd_qb = *qlvb;
908
909 return 0;
910 }
911
912 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
913 struct gfs2_holder *q_gh)
914 {
915 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
916 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
917 struct gfs2_holder i_gh;
918 int error;
919
920 restart:
921 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
922 if (error)
923 return error;
924
925 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
926
927 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
928 gfs2_glock_dq_uninit(q_gh);
929 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
930 GL_NOCACHE, q_gh);
931 if (error)
932 return error;
933
934 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
935 if (error)
936 goto fail;
937
938 error = update_qd(sdp, qd);
939 if (error)
940 goto fail_gunlock;
941
942 gfs2_glock_dq_uninit(&i_gh);
943 gfs2_glock_dq_uninit(q_gh);
944 force_refresh = 0;
945 goto restart;
946 }
947
948 return 0;
949
950 fail_gunlock:
951 gfs2_glock_dq_uninit(&i_gh);
952 fail:
953 gfs2_glock_dq_uninit(q_gh);
954 return error;
955 }
956
957 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
958 {
959 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
960 struct gfs2_quota_data *qd;
961 unsigned int x;
962 int error = 0;
963
964 error = gfs2_quota_hold(ip, uid, gid);
965 if (error)
966 return error;
967
968 if (capable(CAP_SYS_RESOURCE) ||
969 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
970 return 0;
971
972 sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
973 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
974
975 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
976 int force = NO_FORCE;
977 qd = ip->i_res->rs_qa_qd[x];
978 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
979 force = FORCE;
980 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
981 if (error)
982 break;
983 }
984
985 if (!error)
986 set_bit(GIF_QD_LOCKED, &ip->i_flags);
987 else {
988 while (x--)
989 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
990 gfs2_quota_unhold(ip);
991 }
992
993 return error;
994 }
995
996 static int need_sync(struct gfs2_quota_data *qd)
997 {
998 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
999 struct gfs2_tune *gt = &sdp->sd_tune;
1000 s64 value;
1001 unsigned int num, den;
1002 int do_sync = 1;
1003
1004 if (!qd->qd_qb.qb_limit)
1005 return 0;
1006
1007 spin_lock(&qd_lock);
1008 value = qd->qd_change;
1009 spin_unlock(&qd_lock);
1010
1011 spin_lock(&gt->gt_spin);
1012 num = gt->gt_quota_scale_num;
1013 den = gt->gt_quota_scale_den;
1014 spin_unlock(&gt->gt_spin);
1015
1016 if (value < 0)
1017 do_sync = 0;
1018 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1019 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1020 do_sync = 0;
1021 else {
1022 value *= gfs2_jindex_size(sdp) * num;
1023 value = div_s64(value, den);
1024 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1025 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1026 do_sync = 0;
1027 }
1028
1029 return do_sync;
1030 }
1031
1032 void gfs2_quota_unlock(struct gfs2_inode *ip)
1033 {
1034 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1035 struct gfs2_quota_data *qda[4];
1036 unsigned int count = 0;
1037 unsigned int x;
1038 int found;
1039
1040 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1041 goto out;
1042
1043 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1044 struct gfs2_quota_data *qd;
1045 int sync;
1046
1047 qd = ip->i_res->rs_qa_qd[x];
1048 sync = need_sync(qd);
1049
1050 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1051 if (!sync)
1052 continue;
1053
1054 spin_lock(&qd_lock);
1055 found = qd_check_sync(sdp, qd, NULL);
1056 spin_unlock(&qd_lock);
1057
1058 if (!found)
1059 continue;
1060
1061 gfs2_assert_warn(sdp, qd->qd_change_sync);
1062 if (bh_get(qd)) {
1063 clear_bit(QDF_LOCKED, &qd->qd_flags);
1064 slot_put(qd);
1065 qd_put(qd);
1066 continue;
1067 }
1068
1069 qda[count++] = qd;
1070 }
1071
1072 if (count) {
1073 do_sync(count, qda);
1074 for (x = 0; x < count; x++)
1075 qd_unlock(qda[x]);
1076 }
1077
1078 out:
1079 gfs2_quota_unhold(ip);
1080 }
1081
1082 #define MAX_LINE 256
1083
1084 static int print_message(struct gfs2_quota_data *qd, char *type)
1085 {
1086 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1087
1088 fs_info(sdp, "quota %s for %s %u\n",
1089 type,
1090 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1091 from_kqid(&init_user_ns, qd->qd_id));
1092
1093 return 0;
1094 }
1095
1096 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1097 {
1098 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1099 struct gfs2_quota_data *qd;
1100 s64 value;
1101 unsigned int x;
1102 int error = 0;
1103
1104 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1105 return 0;
1106
1107 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1108 return 0;
1109
1110 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1111 qd = ip->i_res->rs_qa_qd[x];
1112
1113 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1114 qid_eq(qd->qd_id, make_kqid_gid(gid))))
1115 continue;
1116
1117 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1118 spin_lock(&qd_lock);
1119 value += qd->qd_change;
1120 spin_unlock(&qd_lock);
1121
1122 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1123 print_message(qd, "exceeded");
1124 quota_send_warning(qd->qd_id,
1125 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1126
1127 error = -EDQUOT;
1128 break;
1129 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1130 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1131 time_after_eq(jiffies, qd->qd_last_warn +
1132 gfs2_tune_get(sdp,
1133 gt_quota_warn_period) * HZ)) {
1134 quota_send_warning(qd->qd_id,
1135 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1136 error = print_message(qd, "warning");
1137 qd->qd_last_warn = jiffies;
1138 }
1139 }
1140
1141 return error;
1142 }
1143
1144 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1145 kuid_t uid, kgid_t gid)
1146 {
1147 struct gfs2_quota_data *qd;
1148 unsigned int x;
1149
1150 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1151 return;
1152 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1153 return;
1154
1155 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1156 qd = ip->i_res->rs_qa_qd[x];
1157
1158 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1159 qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1160 do_qc(qd, change);
1161 }
1162 }
1163 }
1164
1165 int gfs2_quota_sync(struct super_block *sb, int type)
1166 {
1167 struct gfs2_sbd *sdp = sb->s_fs_info;
1168 struct gfs2_quota_data **qda;
1169 unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
1170 unsigned int num_qd;
1171 unsigned int x;
1172 int error = 0;
1173
1174 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1175 if (!qda)
1176 return -ENOMEM;
1177
1178 mutex_lock(&sdp->sd_quota_sync_mutex);
1179 sdp->sd_quota_sync_gen++;
1180
1181 do {
1182 num_qd = 0;
1183
1184 for (;;) {
1185 error = qd_fish(sdp, qda + num_qd);
1186 if (error || !qda[num_qd])
1187 break;
1188 if (++num_qd == max_qd)
1189 break;
1190 }
1191
1192 if (num_qd) {
1193 if (!error)
1194 error = do_sync(num_qd, qda);
1195 if (!error)
1196 for (x = 0; x < num_qd; x++)
1197 qda[x]->qd_sync_gen =
1198 sdp->sd_quota_sync_gen;
1199
1200 for (x = 0; x < num_qd; x++)
1201 qd_unlock(qda[x]);
1202 }
1203 } while (!error && num_qd == max_qd);
1204
1205 mutex_unlock(&sdp->sd_quota_sync_mutex);
1206 kfree(qda);
1207
1208 return error;
1209 }
1210
1211 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1212 {
1213 struct gfs2_quota_data *qd;
1214 struct gfs2_holder q_gh;
1215 int error;
1216
1217 error = qd_get(sdp, qid, &qd);
1218 if (error)
1219 return error;
1220
1221 error = do_glock(qd, FORCE, &q_gh);
1222 if (!error)
1223 gfs2_glock_dq_uninit(&q_gh);
1224
1225 qd_put(qd);
1226 return error;
1227 }
1228
1229 int gfs2_quota_init(struct gfs2_sbd *sdp)
1230 {
1231 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1232 u64 size = i_size_read(sdp->sd_qc_inode);
1233 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1234 unsigned int x, slot = 0;
1235 unsigned int found = 0;
1236 unsigned int hash;
1237 unsigned int bm_size;
1238 u64 dblock;
1239 u32 extlen = 0;
1240 int error;
1241
1242 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1243 return -EIO;
1244
1245 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1246 bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1247 bm_size *= sizeof(unsigned long);
1248 error = -ENOMEM;
1249 sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1250 if (sdp->sd_quota_bitmap == NULL)
1251 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1252 __GFP_ZERO, PAGE_KERNEL);
1253 if (!sdp->sd_quota_bitmap)
1254 return error;
1255
1256 for (x = 0; x < blocks; x++) {
1257 struct buffer_head *bh;
1258 const struct gfs2_quota_change *qc;
1259 unsigned int y;
1260
1261 if (!extlen) {
1262 int new = 0;
1263 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1264 if (error)
1265 goto fail;
1266 }
1267 error = -EIO;
1268 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1269 if (!bh)
1270 goto fail;
1271 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1272 brelse(bh);
1273 goto fail;
1274 }
1275
1276 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1277 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1278 y++, slot++) {
1279 struct gfs2_quota_data *qd;
1280 s64 qc_change = be64_to_cpu(qc->qc_change);
1281 u32 qc_flags = be32_to_cpu(qc->qc_flags);
1282 enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1283 USRQUOTA : GRPQUOTA;
1284 struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1285 be32_to_cpu(qc->qc_id));
1286 qc++;
1287 if (!qc_change)
1288 continue;
1289
1290 hash = gfs2_qd_hash(sdp, qc_id);
1291 qd = qd_alloc(hash, sdp, qc_id);
1292 if (qd == NULL) {
1293 brelse(bh);
1294 goto fail;
1295 }
1296
1297 set_bit(QDF_CHANGE, &qd->qd_flags);
1298 qd->qd_change = qc_change;
1299 qd->qd_slot = slot;
1300 qd->qd_slot_count = 1;
1301
1302 spin_lock(&qd_lock);
1303 BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1304 list_add(&qd->qd_list, &sdp->sd_quota_list);
1305 atomic_inc(&sdp->sd_quota_count);
1306 spin_unlock(&qd_lock);
1307
1308 spin_lock_bucket(hash);
1309 hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1310 spin_unlock_bucket(hash);
1311
1312 found++;
1313 }
1314
1315 brelse(bh);
1316 dblock++;
1317 extlen--;
1318 }
1319
1320 if (found)
1321 fs_info(sdp, "found %u quota changes\n", found);
1322
1323 return 0;
1324
1325 fail:
1326 gfs2_quota_cleanup(sdp);
1327 return error;
1328 }
1329
1330 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1331 {
1332 struct list_head *head = &sdp->sd_quota_list;
1333 struct gfs2_quota_data *qd;
1334
1335 spin_lock(&qd_lock);
1336 while (!list_empty(head)) {
1337 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1338
1339 list_del(&qd->qd_list);
1340
1341 /* Also remove if this qd exists in the reclaim list */
1342 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1343 atomic_dec(&sdp->sd_quota_count);
1344 spin_unlock(&qd_lock);
1345
1346 spin_lock_bucket(qd->qd_hash);
1347 hlist_bl_del_rcu(&qd->qd_hlist);
1348 spin_unlock_bucket(qd->qd_hash);
1349
1350 gfs2_assert_warn(sdp, !qd->qd_change);
1351 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1352 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1353
1354 gfs2_glock_put(qd->qd_gl);
1355 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1356
1357 spin_lock(&qd_lock);
1358 }
1359 spin_unlock(&qd_lock);
1360
1361 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1362
1363 if (sdp->sd_quota_bitmap) {
1364 if (is_vmalloc_addr(sdp->sd_quota_bitmap))
1365 vfree(sdp->sd_quota_bitmap);
1366 else
1367 kfree(sdp->sd_quota_bitmap);
1368 sdp->sd_quota_bitmap = NULL;
1369 }
1370 }
1371
1372 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1373 {
1374 if (error == 0 || error == -EROFS)
1375 return;
1376 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1377 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1378 }
1379
1380 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1381 int (*fxn)(struct super_block *sb, int type),
1382 unsigned long t, unsigned long *timeo,
1383 unsigned int *new_timeo)
1384 {
1385 if (t >= *timeo) {
1386 int error = fxn(sdp->sd_vfs, 0);
1387 quotad_error(sdp, msg, error);
1388 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1389 } else {
1390 *timeo -= t;
1391 }
1392 }
1393
1394 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1395 {
1396 struct gfs2_inode *ip;
1397
1398 while(1) {
1399 ip = NULL;
1400 spin_lock(&sdp->sd_trunc_lock);
1401 if (!list_empty(&sdp->sd_trunc_list)) {
1402 ip = list_entry(sdp->sd_trunc_list.next,
1403 struct gfs2_inode, i_trunc_list);
1404 list_del_init(&ip->i_trunc_list);
1405 }
1406 spin_unlock(&sdp->sd_trunc_lock);
1407 if (ip == NULL)
1408 return;
1409 gfs2_glock_finish_truncate(ip);
1410 }
1411 }
1412
1413 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1414 if (!sdp->sd_statfs_force_sync) {
1415 sdp->sd_statfs_force_sync = 1;
1416 wake_up(&sdp->sd_quota_wait);
1417 }
1418 }
1419
1420
1421 /**
1422 * gfs2_quotad - Write cached quota changes into the quota file
1423 * @sdp: Pointer to GFS2 superblock
1424 *
1425 */
1426
1427 int gfs2_quotad(void *data)
1428 {
1429 struct gfs2_sbd *sdp = data;
1430 struct gfs2_tune *tune = &sdp->sd_tune;
1431 unsigned long statfs_timeo = 0;
1432 unsigned long quotad_timeo = 0;
1433 unsigned long t = 0;
1434 DEFINE_WAIT(wait);
1435 int empty;
1436
1437 while (!kthread_should_stop()) {
1438
1439 /* Update the master statfs file */
1440 if (sdp->sd_statfs_force_sync) {
1441 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1442 quotad_error(sdp, "statfs", error);
1443 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1444 }
1445 else
1446 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1447 &statfs_timeo,
1448 &tune->gt_statfs_quantum);
1449
1450 /* Update quota file */
1451 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1452 &quotad_timeo, &tune->gt_quota_quantum);
1453
1454 /* Check for & recover partially truncated inodes */
1455 quotad_check_trunc_list(sdp);
1456
1457 try_to_freeze();
1458
1459 t = min(quotad_timeo, statfs_timeo);
1460
1461 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1462 spin_lock(&sdp->sd_trunc_lock);
1463 empty = list_empty(&sdp->sd_trunc_list);
1464 spin_unlock(&sdp->sd_trunc_lock);
1465 if (empty && !sdp->sd_statfs_force_sync)
1466 t -= schedule_timeout(t);
1467 else
1468 t = 0;
1469 finish_wait(&sdp->sd_quota_wait, &wait);
1470 }
1471
1472 return 0;
1473 }
1474
1475 static int gfs2_quota_get_xstate(struct super_block *sb,
1476 struct fs_quota_stat *fqs)
1477 {
1478 struct gfs2_sbd *sdp = sb->s_fs_info;
1479
1480 memset(fqs, 0, sizeof(struct fs_quota_stat));
1481 fqs->qs_version = FS_QSTAT_VERSION;
1482
1483 switch (sdp->sd_args.ar_quota) {
1484 case GFS2_QUOTA_ON:
1485 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1486 /*FALLTHRU*/
1487 case GFS2_QUOTA_ACCOUNT:
1488 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1489 break;
1490 case GFS2_QUOTA_OFF:
1491 break;
1492 }
1493
1494 if (sdp->sd_quota_inode) {
1495 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1496 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1497 }
1498 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1499 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1500 fqs->qs_incoredqs = list_lru_count(&gfs2_qd_lru);
1501 return 0;
1502 }
1503
1504 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1505 struct fs_disk_quota *fdq)
1506 {
1507 struct gfs2_sbd *sdp = sb->s_fs_info;
1508 struct gfs2_quota_lvb *qlvb;
1509 struct gfs2_quota_data *qd;
1510 struct gfs2_holder q_gh;
1511 int error;
1512
1513 memset(fdq, 0, sizeof(struct fs_disk_quota));
1514
1515 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1516 return -ESRCH; /* Crazy XFS error code */
1517
1518 if ((qid.type != USRQUOTA) &&
1519 (qid.type != GRPQUOTA))
1520 return -EINVAL;
1521
1522 error = qd_get(sdp, qid, &qd);
1523 if (error)
1524 return error;
1525 error = do_glock(qd, FORCE, &q_gh);
1526 if (error)
1527 goto out;
1528
1529 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1530 fdq->d_version = FS_DQUOT_VERSION;
1531 fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1532 fdq->d_id = from_kqid_munged(current_user_ns(), qid);
1533 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1534 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1535 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1536
1537 gfs2_glock_dq_uninit(&q_gh);
1538 out:
1539 qd_put(qd);
1540 return error;
1541 }
1542
1543 /* GFS2 only supports a subset of the XFS fields */
1544 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1545
1546 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1547 struct fs_disk_quota *fdq)
1548 {
1549 struct gfs2_sbd *sdp = sb->s_fs_info;
1550 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1551 struct gfs2_quota_data *qd;
1552 struct gfs2_holder q_gh, i_gh;
1553 unsigned int data_blocks, ind_blocks;
1554 unsigned int blocks = 0;
1555 int alloc_required;
1556 loff_t offset;
1557 int error;
1558
1559 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1560 return -ESRCH; /* Crazy XFS error code */
1561
1562 if ((qid.type != USRQUOTA) &&
1563 (qid.type != GRPQUOTA))
1564 return -EINVAL;
1565
1566 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1567 return -EINVAL;
1568
1569 error = qd_get(sdp, qid, &qd);
1570 if (error)
1571 return error;
1572
1573 error = gfs2_rs_alloc(ip);
1574 if (error)
1575 goto out_put;
1576
1577 mutex_lock(&ip->i_inode.i_mutex);
1578 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1579 if (error)
1580 goto out_unlockput;
1581 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1582 if (error)
1583 goto out_q;
1584
1585 /* Check for existing entry, if none then alloc new blocks */
1586 error = update_qd(sdp, qd);
1587 if (error)
1588 goto out_i;
1589
1590 /* If nothing has changed, this is a no-op */
1591 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1592 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1593 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1594
1595 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1596 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1597 fdq->d_fieldmask ^= FS_DQ_BHARD;
1598
1599 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1600 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1601 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1602
1603 if (fdq->d_fieldmask == 0)
1604 goto out_i;
1605
1606 offset = qd2offset(qd);
1607 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1608 if (gfs2_is_stuffed(ip))
1609 alloc_required = 1;
1610 if (alloc_required) {
1611 struct gfs2_alloc_parms ap = { .aflags = 0, };
1612 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1613 &data_blocks, &ind_blocks);
1614 blocks = 1 + data_blocks + ind_blocks;
1615 ap.target = blocks;
1616 error = gfs2_inplace_reserve(ip, &ap);
1617 if (error)
1618 goto out_i;
1619 blocks += gfs2_rg_blocks(ip, blocks);
1620 }
1621
1622 /* Some quotas span block boundaries and can update two blocks,
1623 adding an extra block to the transaction to handle such quotas */
1624 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1625 if (error)
1626 goto out_release;
1627
1628 /* Apply changes */
1629 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1630
1631 gfs2_trans_end(sdp);
1632 out_release:
1633 if (alloc_required)
1634 gfs2_inplace_release(ip);
1635 out_i:
1636 gfs2_glock_dq_uninit(&i_gh);
1637 out_q:
1638 gfs2_glock_dq_uninit(&q_gh);
1639 out_unlockput:
1640 mutex_unlock(&ip->i_inode.i_mutex);
1641 out_put:
1642 qd_put(qd);
1643 return error;
1644 }
1645
1646 const struct quotactl_ops gfs2_quotactl_ops = {
1647 .quota_sync = gfs2_quota_sync,
1648 .get_xstate = gfs2_quota_get_xstate,
1649 .get_dqblk = gfs2_get_dqblk,
1650 .set_dqblk = gfs2_set_dqblk,
1651 };
1652
1653 void __init gfs2_quota_hash_init(void)
1654 {
1655 unsigned i;
1656
1657 for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1658 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1659 }
Linux with added FPC-III support