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GFS2: global conversion to pr_foo()
[deliverable/linux.git] / fs / gfs2 / quota.c
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 #include <linux/lockref.h>
54 #include <linux/list_lru.h>
55 #include <linux/rcupdate.h>
56 #include <linux/rculist_bl.h>
57 #include <linux/bit_spinlock.h>
58 #include <linux/jhash.h>
59 #include <linux/vmalloc.h>
60
61 #include "gfs2.h"
62 #include "incore.h"
63 #include "bmap.h"
64 #include "glock.h"
65 #include "glops.h"
66 #include "log.h"
67 #include "meta_io.h"
68 #include "quota.h"
69 #include "rgrp.h"
70 #include "super.h"
71 #include "trans.h"
72 #include "inode.h"
73 #include "util.h"
74
75 #define GFS2_QD_HASH_SHIFT 12
76 #define GFS2_QD_HASH_SIZE (1 << GFS2_QD_HASH_SHIFT)
77 #define GFS2_QD_HASH_MASK (GFS2_QD_HASH_SIZE - 1)
78
79 /* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */
80 /* -> sd_bitmap_lock */
81 static DEFINE_SPINLOCK(qd_lock);
82 struct list_lru gfs2_qd_lru;
83
84 static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
85
86 static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
87 const struct kqid qid)
88 {
89 unsigned int h;
90
91 h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
92 h = jhash(&qid, sizeof(struct kqid), h);
93
94 return h & GFS2_QD_HASH_MASK;
95 }
96
97 static inline void spin_lock_bucket(unsigned int hash)
98 {
99 hlist_bl_lock(&qd_hash_table[hash]);
100 }
101
102 static inline void spin_unlock_bucket(unsigned int hash)
103 {
104 hlist_bl_unlock(&qd_hash_table[hash]);
105 }
106
107 static void gfs2_qd_dealloc(struct rcu_head *rcu)
108 {
109 struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
110 kmem_cache_free(gfs2_quotad_cachep, qd);
111 }
112
113 static void gfs2_qd_dispose(struct list_head *list)
114 {
115 struct gfs2_quota_data *qd;
116 struct gfs2_sbd *sdp;
117
118 while (!list_empty(list)) {
119 qd = list_entry(list->next, struct gfs2_quota_data, qd_lru);
120 sdp = qd->qd_gl->gl_sbd;
121
122 list_del(&qd->qd_lru);
123
124 /* Free from the filesystem-specific list */
125 spin_lock(&qd_lock);
126 list_del(&qd->qd_list);
127 spin_unlock(&qd_lock);
128
129 spin_lock_bucket(qd->qd_hash);
130 hlist_bl_del_rcu(&qd->qd_hlist);
131 spin_unlock_bucket(qd->qd_hash);
132
133 gfs2_assert_warn(sdp, !qd->qd_change);
134 gfs2_assert_warn(sdp, !qd->qd_slot_count);
135 gfs2_assert_warn(sdp, !qd->qd_bh_count);
136
137 gfs2_glock_put(qd->qd_gl);
138 atomic_dec(&sdp->sd_quota_count);
139
140 /* Delete it from the common reclaim list */
141 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
142 }
143 }
144
145
146 static enum lru_status gfs2_qd_isolate(struct list_head *item, spinlock_t *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_move(&qd->qd_lru, dispose);
157 }
158
159 spin_unlock(&qd->qd_lockref.lock);
160 return LRU_REMOVED;
161 }
162
163 static 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_walk_node(&gfs2_qd_lru, sc->nid, gfs2_qd_isolate,
173 &dispose, &sc->nr_to_scan);
174
175 gfs2_qd_dispose(&dispose);
176
177 return freed;
178 }
179
180 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
181 struct shrink_control *sc)
182 {
183 return vfs_pressure_ratio(list_lru_count_node(&gfs2_qd_lru, sc->nid));
184 }
185
186 struct 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
194 static 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
201 static 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
211 static 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
235 fail:
236 kmem_cache_free(gfs2_quotad_cachep, qd);
237 return NULL;
238 }
239
240 static 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
262 static 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
300 static void qd_hold(struct gfs2_quota_data *qd)
301 {
302 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
303 gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
304 lockref_get(&qd->qd_lockref);
305 }
306
307 static 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
318 static 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 out:
334 qd->qd_slot_count++;
335 }
336 spin_unlock(&sdp->sd_bitmap_lock);
337
338 return error;
339 }
340
341 static void slot_hold(struct gfs2_quota_data *qd)
342 {
343 struct gfs2_sbd *sdp = qd->qd_sbd;
344
345 spin_lock(&sdp->sd_bitmap_lock);
346 gfs2_assert(sdp, qd->qd_slot_count);
347 qd->qd_slot_count++;
348 spin_unlock(&sdp->sd_bitmap_lock);
349 }
350
351 static void slot_put(struct gfs2_quota_data *qd)
352 {
353 struct gfs2_sbd *sdp = qd->qd_sbd;
354
355 spin_lock(&sdp->sd_bitmap_lock);
356 gfs2_assert(sdp, qd->qd_slot_count);
357 if (!--qd->qd_slot_count) {
358 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
359 qd->qd_slot = -1;
360 }
361 spin_unlock(&sdp->sd_bitmap_lock);
362 }
363
364 static int bh_get(struct gfs2_quota_data *qd)
365 {
366 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
367 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
368 unsigned int block, offset;
369 struct buffer_head *bh;
370 int error;
371 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
372
373 mutex_lock(&sdp->sd_quota_mutex);
374
375 if (qd->qd_bh_count++) {
376 mutex_unlock(&sdp->sd_quota_mutex);
377 return 0;
378 }
379
380 block = qd->qd_slot / sdp->sd_qc_per_block;
381 offset = qd->qd_slot % sdp->sd_qc_per_block;
382
383 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
384 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
385 if (error)
386 goto fail;
387 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
388 if (error)
389 goto fail;
390 error = -EIO;
391 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
392 goto fail_brelse;
393
394 qd->qd_bh = bh;
395 qd->qd_bh_qc = (struct gfs2_quota_change *)
396 (bh->b_data + sizeof(struct gfs2_meta_header) +
397 offset * sizeof(struct gfs2_quota_change));
398
399 mutex_unlock(&sdp->sd_quota_mutex);
400
401 return 0;
402
403 fail_brelse:
404 brelse(bh);
405 fail:
406 qd->qd_bh_count--;
407 mutex_unlock(&sdp->sd_quota_mutex);
408 return error;
409 }
410
411 static void bh_put(struct gfs2_quota_data *qd)
412 {
413 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
414
415 mutex_lock(&sdp->sd_quota_mutex);
416 gfs2_assert(sdp, qd->qd_bh_count);
417 if (!--qd->qd_bh_count) {
418 brelse(qd->qd_bh);
419 qd->qd_bh = NULL;
420 qd->qd_bh_qc = NULL;
421 }
422 mutex_unlock(&sdp->sd_quota_mutex);
423 }
424
425 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
426 u64 *sync_gen)
427 {
428 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
429 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
430 (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
431 return 0;
432
433 if (!lockref_get_not_dead(&qd->qd_lockref))
434 return 0;
435
436 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
437 set_bit(QDF_LOCKED, &qd->qd_flags);
438 qd->qd_change_sync = qd->qd_change;
439 slot_hold(qd);
440 return 1;
441 }
442
443 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
444 {
445 struct gfs2_quota_data *qd = NULL;
446 int error;
447 int found = 0;
448
449 *qdp = NULL;
450
451 if (sdp->sd_vfs->s_flags & MS_RDONLY)
452 return 0;
453
454 spin_lock(&qd_lock);
455
456 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
457 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
458 if (found)
459 break;
460 }
461
462 if (!found)
463 qd = NULL;
464
465 spin_unlock(&qd_lock);
466
467 if (qd) {
468 gfs2_assert_warn(sdp, qd->qd_change_sync);
469 error = bh_get(qd);
470 if (error) {
471 clear_bit(QDF_LOCKED, &qd->qd_flags);
472 slot_put(qd);
473 qd_put(qd);
474 return error;
475 }
476 }
477
478 *qdp = qd;
479
480 return 0;
481 }
482
483 static void qd_unlock(struct gfs2_quota_data *qd)
484 {
485 gfs2_assert_warn(qd->qd_gl->gl_sbd,
486 test_bit(QDF_LOCKED, &qd->qd_flags));
487 clear_bit(QDF_LOCKED, &qd->qd_flags);
488 bh_put(qd);
489 slot_put(qd);
490 qd_put(qd);
491 }
492
493 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
494 struct gfs2_quota_data **qdp)
495 {
496 int error;
497
498 error = qd_get(sdp, qid, qdp);
499 if (error)
500 return error;
501
502 error = slot_get(*qdp);
503 if (error)
504 goto fail;
505
506 error = bh_get(*qdp);
507 if (error)
508 goto fail_slot;
509
510 return 0;
511
512 fail_slot:
513 slot_put(*qdp);
514 fail:
515 qd_put(*qdp);
516 return error;
517 }
518
519 static void qdsb_put(struct gfs2_quota_data *qd)
520 {
521 bh_put(qd);
522 slot_put(qd);
523 qd_put(qd);
524 }
525
526 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
527 {
528 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
529 struct gfs2_quota_data **qd;
530 int error;
531
532 if (ip->i_res == NULL) {
533 error = gfs2_rs_alloc(ip);
534 if (error)
535 return error;
536 }
537
538 qd = ip->i_res->rs_qa_qd;
539
540 if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
541 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
542 return -EIO;
543
544 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
545 return 0;
546
547 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
548 if (error)
549 goto out;
550 ip->i_res->rs_qa_qd_num++;
551 qd++;
552
553 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
554 if (error)
555 goto out;
556 ip->i_res->rs_qa_qd_num++;
557 qd++;
558
559 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
560 !uid_eq(uid, ip->i_inode.i_uid)) {
561 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
562 if (error)
563 goto out;
564 ip->i_res->rs_qa_qd_num++;
565 qd++;
566 }
567
568 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
569 !gid_eq(gid, ip->i_inode.i_gid)) {
570 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
571 if (error)
572 goto out;
573 ip->i_res->rs_qa_qd_num++;
574 qd++;
575 }
576
577 out:
578 if (error)
579 gfs2_quota_unhold(ip);
580 return error;
581 }
582
583 void gfs2_quota_unhold(struct gfs2_inode *ip)
584 {
585 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
586 unsigned int x;
587
588 if (ip->i_res == NULL)
589 return;
590 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
591
592 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
593 qdsb_put(ip->i_res->rs_qa_qd[x]);
594 ip->i_res->rs_qa_qd[x] = NULL;
595 }
596 ip->i_res->rs_qa_qd_num = 0;
597 }
598
599 static int sort_qd(const void *a, const void *b)
600 {
601 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
602 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
603
604 if (qid_lt(qd_a->qd_id, qd_b->qd_id))
605 return -1;
606 if (qid_lt(qd_b->qd_id, qd_a->qd_id))
607 return 1;
608 return 0;
609 }
610
611 static void do_qc(struct gfs2_quota_data *qd, s64 change)
612 {
613 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
614 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
615 struct gfs2_quota_change *qc = qd->qd_bh_qc;
616 s64 x;
617
618 mutex_lock(&sdp->sd_quota_mutex);
619 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
620
621 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
622 qc->qc_change = 0;
623 qc->qc_flags = 0;
624 if (qd->qd_id.type == USRQUOTA)
625 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
626 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
627 }
628
629 x = be64_to_cpu(qc->qc_change) + change;
630 qc->qc_change = cpu_to_be64(x);
631
632 spin_lock(&qd_lock);
633 qd->qd_change = x;
634 spin_unlock(&qd_lock);
635
636 if (!x) {
637 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
638 clear_bit(QDF_CHANGE, &qd->qd_flags);
639 qc->qc_flags = 0;
640 qc->qc_id = 0;
641 slot_put(qd);
642 qd_put(qd);
643 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
644 qd_hold(qd);
645 slot_hold(qd);
646 }
647
648 mutex_unlock(&sdp->sd_quota_mutex);
649 }
650
651 /**
652 * gfs2_adjust_quota - adjust record of current block usage
653 * @ip: The quota inode
654 * @loc: Offset of the entry in the quota file
655 * @change: The amount of usage change to record
656 * @qd: The quota data
657 * @fdq: The updated limits to record
658 *
659 * This function was mostly borrowed from gfs2_block_truncate_page which was
660 * in turn mostly borrowed from ext3
661 *
662 * Returns: 0 or -ve on error
663 */
664
665 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
666 s64 change, struct gfs2_quota_data *qd,
667 struct fs_disk_quota *fdq)
668 {
669 struct inode *inode = &ip->i_inode;
670 struct gfs2_sbd *sdp = GFS2_SB(inode);
671 struct address_space *mapping = inode->i_mapping;
672 unsigned long index = loc >> PAGE_CACHE_SHIFT;
673 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
674 unsigned blocksize, iblock, pos;
675 struct buffer_head *bh;
676 struct page *page;
677 void *kaddr, *ptr;
678 struct gfs2_quota q;
679 int err, nbytes;
680 u64 size;
681
682 if (gfs2_is_stuffed(ip)) {
683 err = gfs2_unstuff_dinode(ip, NULL);
684 if (err)
685 return err;
686 }
687
688 memset(&q, 0, sizeof(struct gfs2_quota));
689 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
690 if (err < 0)
691 return err;
692
693 err = -EIO;
694 be64_add_cpu(&q.qu_value, change);
695 qd->qd_qb.qb_value = q.qu_value;
696 if (fdq) {
697 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
698 q.qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
699 qd->qd_qb.qb_warn = q.qu_warn;
700 }
701 if (fdq->d_fieldmask & FS_DQ_BHARD) {
702 q.qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
703 qd->qd_qb.qb_limit = q.qu_limit;
704 }
705 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
706 q.qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
707 qd->qd_qb.qb_value = q.qu_value;
708 }
709 }
710
711 /* Write the quota into the quota file on disk */
712 ptr = &q;
713 nbytes = sizeof(struct gfs2_quota);
714 get_a_page:
715 page = find_or_create_page(mapping, index, GFP_NOFS);
716 if (!page)
717 return -ENOMEM;
718
719 blocksize = inode->i_sb->s_blocksize;
720 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
721
722 if (!page_has_buffers(page))
723 create_empty_buffers(page, blocksize, 0);
724
725 bh = page_buffers(page);
726 pos = blocksize;
727 while (offset >= pos) {
728 bh = bh->b_this_page;
729 iblock++;
730 pos += blocksize;
731 }
732
733 if (!buffer_mapped(bh)) {
734 gfs2_block_map(inode, iblock, bh, 1);
735 if (!buffer_mapped(bh))
736 goto unlock_out;
737 /* If it's a newly allocated disk block for quota, zero it */
738 if (buffer_new(bh))
739 zero_user(page, pos - blocksize, bh->b_size);
740 }
741
742 if (PageUptodate(page))
743 set_buffer_uptodate(bh);
744
745 if (!buffer_uptodate(bh)) {
746 ll_rw_block(READ | REQ_META, 1, &bh);
747 wait_on_buffer(bh);
748 if (!buffer_uptodate(bh))
749 goto unlock_out;
750 }
751
752 gfs2_trans_add_data(ip->i_gl, bh);
753
754 kaddr = kmap_atomic(page);
755 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
756 nbytes = PAGE_CACHE_SIZE - offset;
757 memcpy(kaddr + offset, ptr, nbytes);
758 flush_dcache_page(page);
759 kunmap_atomic(kaddr);
760 unlock_page(page);
761 page_cache_release(page);
762
763 /* If quota straddles page boundary, we need to update the rest of the
764 * quota at the beginning of the next page */
765 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
766 ptr = ptr + nbytes;
767 nbytes = sizeof(struct gfs2_quota) - nbytes;
768 offset = 0;
769 index++;
770 goto get_a_page;
771 }
772
773 size = loc + sizeof(struct gfs2_quota);
774 if (size > inode->i_size)
775 i_size_write(inode, size);
776 inode->i_mtime = inode->i_atime = CURRENT_TIME;
777 mark_inode_dirty(inode);
778 return 0;
779
780 unlock_out:
781 unlock_page(page);
782 page_cache_release(page);
783 return err;
784 }
785
786 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
787 {
788 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
789 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
790 struct gfs2_alloc_parms ap = { .aflags = 0, };
791 unsigned int data_blocks, ind_blocks;
792 struct gfs2_holder *ghs, i_gh;
793 unsigned int qx, x;
794 struct gfs2_quota_data *qd;
795 unsigned reserved;
796 loff_t offset;
797 unsigned int nalloc = 0, blocks;
798 int error;
799
800 error = gfs2_rs_alloc(ip);
801 if (error)
802 return error;
803
804 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
805 &data_blocks, &ind_blocks);
806
807 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
808 if (!ghs)
809 return -ENOMEM;
810
811 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
812 mutex_lock(&ip->i_inode.i_mutex);
813 for (qx = 0; qx < num_qd; qx++) {
814 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
815 GL_NOCACHE, &ghs[qx]);
816 if (error)
817 goto out;
818 }
819
820 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
821 if (error)
822 goto out;
823
824 for (x = 0; x < num_qd; x++) {
825 offset = qd2offset(qda[x]);
826 if (gfs2_write_alloc_required(ip, offset,
827 sizeof(struct gfs2_quota)))
828 nalloc++;
829 }
830
831 /*
832 * 1 blk for unstuffing inode if stuffed. We add this extra
833 * block to the reservation unconditionally. If the inode
834 * doesn't need unstuffing, the block will be released to the
835 * rgrp since it won't be allocated during the transaction
836 */
837 /* +3 in the end for unstuffing block, inode size update block
838 * and another block in case quota straddles page boundary and
839 * two blocks need to be updated instead of 1 */
840 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
841
842 reserved = 1 + (nalloc * (data_blocks + ind_blocks));
843 ap.target = reserved;
844 error = gfs2_inplace_reserve(ip, &ap);
845 if (error)
846 goto out_alloc;
847
848 if (nalloc)
849 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
850
851 error = gfs2_trans_begin(sdp, blocks, 0);
852 if (error)
853 goto out_ipres;
854
855 for (x = 0; x < num_qd; x++) {
856 qd = qda[x];
857 offset = qd2offset(qd);
858 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
859 if (error)
860 goto out_end_trans;
861
862 do_qc(qd, -qd->qd_change_sync);
863 set_bit(QDF_REFRESH, &qd->qd_flags);
864 }
865
866 error = 0;
867
868 out_end_trans:
869 gfs2_trans_end(sdp);
870 out_ipres:
871 gfs2_inplace_release(ip);
872 out_alloc:
873 gfs2_glock_dq_uninit(&i_gh);
874 out:
875 while (qx--)
876 gfs2_glock_dq_uninit(&ghs[qx]);
877 mutex_unlock(&ip->i_inode.i_mutex);
878 kfree(ghs);
879 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
880 return error;
881 }
882
883 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
884 {
885 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
886 struct gfs2_quota q;
887 struct gfs2_quota_lvb *qlvb;
888 loff_t pos;
889 int error;
890
891 memset(&q, 0, sizeof(struct gfs2_quota));
892 pos = qd2offset(qd);
893 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
894 if (error < 0)
895 return error;
896
897 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
898 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
899 qlvb->__pad = 0;
900 qlvb->qb_limit = q.qu_limit;
901 qlvb->qb_warn = q.qu_warn;
902 qlvb->qb_value = q.qu_value;
903 qd->qd_qb = *qlvb;
904
905 return 0;
906 }
907
908 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
909 struct gfs2_holder *q_gh)
910 {
911 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
912 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
913 struct gfs2_holder i_gh;
914 int error;
915
916 restart:
917 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
918 if (error)
919 return error;
920
921 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
922
923 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
924 gfs2_glock_dq_uninit(q_gh);
925 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
926 GL_NOCACHE, q_gh);
927 if (error)
928 return error;
929
930 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
931 if (error)
932 goto fail;
933
934 error = update_qd(sdp, qd);
935 if (error)
936 goto fail_gunlock;
937
938 gfs2_glock_dq_uninit(&i_gh);
939 gfs2_glock_dq_uninit(q_gh);
940 force_refresh = 0;
941 goto restart;
942 }
943
944 return 0;
945
946 fail_gunlock:
947 gfs2_glock_dq_uninit(&i_gh);
948 fail:
949 gfs2_glock_dq_uninit(q_gh);
950 return error;
951 }
952
953 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
954 {
955 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
956 struct gfs2_quota_data *qd;
957 unsigned int x;
958 int error = 0;
959
960 error = gfs2_quota_hold(ip, uid, gid);
961 if (error)
962 return error;
963
964 if (capable(CAP_SYS_RESOURCE) ||
965 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
966 return 0;
967
968 sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
969 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
970
971 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
972 int force = NO_FORCE;
973 qd = ip->i_res->rs_qa_qd[x];
974 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
975 force = FORCE;
976 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
977 if (error)
978 break;
979 }
980
981 if (!error)
982 set_bit(GIF_QD_LOCKED, &ip->i_flags);
983 else {
984 while (x--)
985 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
986 gfs2_quota_unhold(ip);
987 }
988
989 return error;
990 }
991
992 static int need_sync(struct gfs2_quota_data *qd)
993 {
994 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
995 struct gfs2_tune *gt = &sdp->sd_tune;
996 s64 value;
997 unsigned int num, den;
998 int do_sync = 1;
999
1000 if (!qd->qd_qb.qb_limit)
1001 return 0;
1002
1003 spin_lock(&qd_lock);
1004 value = qd->qd_change;
1005 spin_unlock(&qd_lock);
1006
1007 spin_lock(&gt->gt_spin);
1008 num = gt->gt_quota_scale_num;
1009 den = gt->gt_quota_scale_den;
1010 spin_unlock(&gt->gt_spin);
1011
1012 if (value < 0)
1013 do_sync = 0;
1014 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1015 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1016 do_sync = 0;
1017 else {
1018 value *= gfs2_jindex_size(sdp) * num;
1019 value = div_s64(value, den);
1020 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1021 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1022 do_sync = 0;
1023 }
1024
1025 return do_sync;
1026 }
1027
1028 void gfs2_quota_unlock(struct gfs2_inode *ip)
1029 {
1030 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1031 struct gfs2_quota_data *qda[4];
1032 unsigned int count = 0;
1033 unsigned int x;
1034 int found;
1035
1036 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1037 goto out;
1038
1039 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1040 struct gfs2_quota_data *qd;
1041 int sync;
1042
1043 qd = ip->i_res->rs_qa_qd[x];
1044 sync = need_sync(qd);
1045
1046 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1047 if (!sync)
1048 continue;
1049
1050 spin_lock(&qd_lock);
1051 found = qd_check_sync(sdp, qd, NULL);
1052 spin_unlock(&qd_lock);
1053
1054 if (!found)
1055 continue;
1056
1057 gfs2_assert_warn(sdp, qd->qd_change_sync);
1058 if (bh_get(qd)) {
1059 clear_bit(QDF_LOCKED, &qd->qd_flags);
1060 slot_put(qd);
1061 qd_put(qd);
1062 continue;
1063 }
1064
1065 qda[count++] = qd;
1066 }
1067
1068 if (count) {
1069 do_sync(count, qda);
1070 for (x = 0; x < count; x++)
1071 qd_unlock(qda[x]);
1072 }
1073
1074 out:
1075 gfs2_quota_unhold(ip);
1076 }
1077
1078 #define MAX_LINE 256
1079
1080 static int print_message(struct gfs2_quota_data *qd, char *type)
1081 {
1082 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1083
1084 pr_info("GFS2: fsid=%s: quota %s for %s %u\n",
1085 sdp->sd_fsname, type,
1086 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1087 from_kqid(&init_user_ns, qd->qd_id));
1088
1089 return 0;
1090 }
1091
1092 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1093 {
1094 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1095 struct gfs2_quota_data *qd;
1096 s64 value;
1097 unsigned int x;
1098 int error = 0;
1099
1100 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1101 return 0;
1102
1103 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1104 return 0;
1105
1106 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1107 qd = ip->i_res->rs_qa_qd[x];
1108
1109 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1110 qid_eq(qd->qd_id, make_kqid_gid(gid))))
1111 continue;
1112
1113 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1114 spin_lock(&qd_lock);
1115 value += qd->qd_change;
1116 spin_unlock(&qd_lock);
1117
1118 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1119 print_message(qd, "exceeded");
1120 quota_send_warning(qd->qd_id,
1121 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1122
1123 error = -EDQUOT;
1124 break;
1125 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1126 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1127 time_after_eq(jiffies, qd->qd_last_warn +
1128 gfs2_tune_get(sdp,
1129 gt_quota_warn_period) * HZ)) {
1130 quota_send_warning(qd->qd_id,
1131 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1132 error = print_message(qd, "warning");
1133 qd->qd_last_warn = jiffies;
1134 }
1135 }
1136
1137 return error;
1138 }
1139
1140 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1141 kuid_t uid, kgid_t gid)
1142 {
1143 struct gfs2_quota_data *qd;
1144 unsigned int x;
1145
1146 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1147 return;
1148 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1149 return;
1150
1151 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1152 qd = ip->i_res->rs_qa_qd[x];
1153
1154 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1155 qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1156 do_qc(qd, change);
1157 }
1158 }
1159 }
1160
1161 int gfs2_quota_sync(struct super_block *sb, int type)
1162 {
1163 struct gfs2_sbd *sdp = sb->s_fs_info;
1164 struct gfs2_quota_data **qda;
1165 unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
1166 unsigned int num_qd;
1167 unsigned int x;
1168 int error = 0;
1169
1170 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1171 if (!qda)
1172 return -ENOMEM;
1173
1174 mutex_lock(&sdp->sd_quota_sync_mutex);
1175 sdp->sd_quota_sync_gen++;
1176
1177 do {
1178 num_qd = 0;
1179
1180 for (;;) {
1181 error = qd_fish(sdp, qda + num_qd);
1182 if (error || !qda[num_qd])
1183 break;
1184 if (++num_qd == max_qd)
1185 break;
1186 }
1187
1188 if (num_qd) {
1189 if (!error)
1190 error = do_sync(num_qd, qda);
1191 if (!error)
1192 for (x = 0; x < num_qd; x++)
1193 qda[x]->qd_sync_gen =
1194 sdp->sd_quota_sync_gen;
1195
1196 for (x = 0; x < num_qd; x++)
1197 qd_unlock(qda[x]);
1198 }
1199 } while (!error && num_qd == max_qd);
1200
1201 mutex_unlock(&sdp->sd_quota_sync_mutex);
1202 kfree(qda);
1203
1204 return error;
1205 }
1206
1207 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1208 {
1209 struct gfs2_quota_data *qd;
1210 struct gfs2_holder q_gh;
1211 int error;
1212
1213 error = qd_get(sdp, qid, &qd);
1214 if (error)
1215 return error;
1216
1217 error = do_glock(qd, FORCE, &q_gh);
1218 if (!error)
1219 gfs2_glock_dq_uninit(&q_gh);
1220
1221 qd_put(qd);
1222 return error;
1223 }
1224
1225 int gfs2_quota_init(struct gfs2_sbd *sdp)
1226 {
1227 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1228 u64 size = i_size_read(sdp->sd_qc_inode);
1229 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1230 unsigned int x, slot = 0;
1231 unsigned int found = 0;
1232 unsigned int hash;
1233 unsigned int bm_size;
1234 u64 dblock;
1235 u32 extlen = 0;
1236 int error;
1237
1238 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1239 return -EIO;
1240
1241 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1242 bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1243 bm_size *= sizeof(unsigned long);
1244 error = -ENOMEM;
1245 sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1246 if (sdp->sd_quota_bitmap == NULL)
1247 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1248 __GFP_ZERO, PAGE_KERNEL);
1249 if (!sdp->sd_quota_bitmap)
1250 return error;
1251
1252 for (x = 0; x < blocks; x++) {
1253 struct buffer_head *bh;
1254 const struct gfs2_quota_change *qc;
1255 unsigned int y;
1256
1257 if (!extlen) {
1258 int new = 0;
1259 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1260 if (error)
1261 goto fail;
1262 }
1263 error = -EIO;
1264 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1265 if (!bh)
1266 goto fail;
1267 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1268 brelse(bh);
1269 goto fail;
1270 }
1271
1272 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1273 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1274 y++, slot++) {
1275 struct gfs2_quota_data *qd;
1276 s64 qc_change = be64_to_cpu(qc->qc_change);
1277 u32 qc_flags = be32_to_cpu(qc->qc_flags);
1278 enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1279 USRQUOTA : GRPQUOTA;
1280 struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1281 be32_to_cpu(qc->qc_id));
1282 qc++;
1283 if (!qc_change)
1284 continue;
1285
1286 hash = gfs2_qd_hash(sdp, qc_id);
1287 qd = qd_alloc(hash, sdp, qc_id);
1288 if (qd == NULL) {
1289 brelse(bh);
1290 goto fail;
1291 }
1292
1293 set_bit(QDF_CHANGE, &qd->qd_flags);
1294 qd->qd_change = qc_change;
1295 qd->qd_slot = slot;
1296 qd->qd_slot_count = 1;
1297
1298 spin_lock(&qd_lock);
1299 BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1300 list_add(&qd->qd_list, &sdp->sd_quota_list);
1301 atomic_inc(&sdp->sd_quota_count);
1302 spin_unlock(&qd_lock);
1303
1304 spin_lock_bucket(hash);
1305 hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1306 spin_unlock_bucket(hash);
1307
1308 found++;
1309 }
1310
1311 brelse(bh);
1312 dblock++;
1313 extlen--;
1314 }
1315
1316 if (found)
1317 fs_info(sdp, "found %u quota changes\n", found);
1318
1319 return 0;
1320
1321 fail:
1322 gfs2_quota_cleanup(sdp);
1323 return error;
1324 }
1325
1326 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1327 {
1328 struct list_head *head = &sdp->sd_quota_list;
1329 struct gfs2_quota_data *qd;
1330
1331 spin_lock(&qd_lock);
1332 while (!list_empty(head)) {
1333 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1334
1335 list_del(&qd->qd_list);
1336
1337 /* Also remove if this qd exists in the reclaim list */
1338 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1339 atomic_dec(&sdp->sd_quota_count);
1340 spin_unlock(&qd_lock);
1341
1342 spin_lock_bucket(qd->qd_hash);
1343 hlist_bl_del_rcu(&qd->qd_hlist);
1344 spin_unlock_bucket(qd->qd_hash);
1345
1346 gfs2_assert_warn(sdp, !qd->qd_change);
1347 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1348 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1349
1350 gfs2_glock_put(qd->qd_gl);
1351 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1352
1353 spin_lock(&qd_lock);
1354 }
1355 spin_unlock(&qd_lock);
1356
1357 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1358
1359 if (sdp->sd_quota_bitmap) {
1360 if (is_vmalloc_addr(sdp->sd_quota_bitmap))
1361 vfree(sdp->sd_quota_bitmap);
1362 else
1363 kfree(sdp->sd_quota_bitmap);
1364 sdp->sd_quota_bitmap = NULL;
1365 }
1366 }
1367
1368 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1369 {
1370 if (error == 0 || error == -EROFS)
1371 return;
1372 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1373 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1374 }
1375
1376 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1377 int (*fxn)(struct super_block *sb, int type),
1378 unsigned long t, unsigned long *timeo,
1379 unsigned int *new_timeo)
1380 {
1381 if (t >= *timeo) {
1382 int error = fxn(sdp->sd_vfs, 0);
1383 quotad_error(sdp, msg, error);
1384 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1385 } else {
1386 *timeo -= t;
1387 }
1388 }
1389
1390 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1391 {
1392 struct gfs2_inode *ip;
1393
1394 while(1) {
1395 ip = NULL;
1396 spin_lock(&sdp->sd_trunc_lock);
1397 if (!list_empty(&sdp->sd_trunc_list)) {
1398 ip = list_entry(sdp->sd_trunc_list.next,
1399 struct gfs2_inode, i_trunc_list);
1400 list_del_init(&ip->i_trunc_list);
1401 }
1402 spin_unlock(&sdp->sd_trunc_lock);
1403 if (ip == NULL)
1404 return;
1405 gfs2_glock_finish_truncate(ip);
1406 }
1407 }
1408
1409 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1410 if (!sdp->sd_statfs_force_sync) {
1411 sdp->sd_statfs_force_sync = 1;
1412 wake_up(&sdp->sd_quota_wait);
1413 }
1414 }
1415
1416
1417 /**
1418 * gfs2_quotad - Write cached quota changes into the quota file
1419 * @sdp: Pointer to GFS2 superblock
1420 *
1421 */
1422
1423 int gfs2_quotad(void *data)
1424 {
1425 struct gfs2_sbd *sdp = data;
1426 struct gfs2_tune *tune = &sdp->sd_tune;
1427 unsigned long statfs_timeo = 0;
1428 unsigned long quotad_timeo = 0;
1429 unsigned long t = 0;
1430 DEFINE_WAIT(wait);
1431 int empty;
1432
1433 while (!kthread_should_stop()) {
1434
1435 /* Update the master statfs file */
1436 if (sdp->sd_statfs_force_sync) {
1437 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1438 quotad_error(sdp, "statfs", error);
1439 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1440 }
1441 else
1442 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1443 &statfs_timeo,
1444 &tune->gt_statfs_quantum);
1445
1446 /* Update quota file */
1447 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1448 &quotad_timeo, &tune->gt_quota_quantum);
1449
1450 /* Check for & recover partially truncated inodes */
1451 quotad_check_trunc_list(sdp);
1452
1453 try_to_freeze();
1454
1455 t = min(quotad_timeo, statfs_timeo);
1456
1457 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1458 spin_lock(&sdp->sd_trunc_lock);
1459 empty = list_empty(&sdp->sd_trunc_list);
1460 spin_unlock(&sdp->sd_trunc_lock);
1461 if (empty && !sdp->sd_statfs_force_sync)
1462 t -= schedule_timeout(t);
1463 else
1464 t = 0;
1465 finish_wait(&sdp->sd_quota_wait, &wait);
1466 }
1467
1468 return 0;
1469 }
1470
1471 static int gfs2_quota_get_xstate(struct super_block *sb,
1472 struct fs_quota_stat *fqs)
1473 {
1474 struct gfs2_sbd *sdp = sb->s_fs_info;
1475
1476 memset(fqs, 0, sizeof(struct fs_quota_stat));
1477 fqs->qs_version = FS_QSTAT_VERSION;
1478
1479 switch (sdp->sd_args.ar_quota) {
1480 case GFS2_QUOTA_ON:
1481 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1482 /*FALLTHRU*/
1483 case GFS2_QUOTA_ACCOUNT:
1484 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1485 break;
1486 case GFS2_QUOTA_OFF:
1487 break;
1488 }
1489
1490 if (sdp->sd_quota_inode) {
1491 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1492 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1493 }
1494 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1495 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1496 fqs->qs_incoredqs = list_lru_count(&gfs2_qd_lru);
1497 return 0;
1498 }
1499
1500 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1501 struct fs_disk_quota *fdq)
1502 {
1503 struct gfs2_sbd *sdp = sb->s_fs_info;
1504 struct gfs2_quota_lvb *qlvb;
1505 struct gfs2_quota_data *qd;
1506 struct gfs2_holder q_gh;
1507 int error;
1508
1509 memset(fdq, 0, sizeof(struct fs_disk_quota));
1510
1511 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1512 return -ESRCH; /* Crazy XFS error code */
1513
1514 if ((qid.type != USRQUOTA) &&
1515 (qid.type != GRPQUOTA))
1516 return -EINVAL;
1517
1518 error = qd_get(sdp, qid, &qd);
1519 if (error)
1520 return error;
1521 error = do_glock(qd, FORCE, &q_gh);
1522 if (error)
1523 goto out;
1524
1525 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1526 fdq->d_version = FS_DQUOT_VERSION;
1527 fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1528 fdq->d_id = from_kqid_munged(current_user_ns(), qid);
1529 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1530 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1531 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1532
1533 gfs2_glock_dq_uninit(&q_gh);
1534 out:
1535 qd_put(qd);
1536 return error;
1537 }
1538
1539 /* GFS2 only supports a subset of the XFS fields */
1540 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1541
1542 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1543 struct fs_disk_quota *fdq)
1544 {
1545 struct gfs2_sbd *sdp = sb->s_fs_info;
1546 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1547 struct gfs2_quota_data *qd;
1548 struct gfs2_holder q_gh, i_gh;
1549 unsigned int data_blocks, ind_blocks;
1550 unsigned int blocks = 0;
1551 int alloc_required;
1552 loff_t offset;
1553 int error;
1554
1555 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1556 return -ESRCH; /* Crazy XFS error code */
1557
1558 if ((qid.type != USRQUOTA) &&
1559 (qid.type != GRPQUOTA))
1560 return -EINVAL;
1561
1562 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1563 return -EINVAL;
1564
1565 error = qd_get(sdp, qid, &qd);
1566 if (error)
1567 return error;
1568
1569 error = gfs2_rs_alloc(ip);
1570 if (error)
1571 goto out_put;
1572
1573 mutex_lock(&ip->i_inode.i_mutex);
1574 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1575 if (error)
1576 goto out_unlockput;
1577 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1578 if (error)
1579 goto out_q;
1580
1581 /* Check for existing entry, if none then alloc new blocks */
1582 error = update_qd(sdp, qd);
1583 if (error)
1584 goto out_i;
1585
1586 /* If nothing has changed, this is a no-op */
1587 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1588 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1589 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1590
1591 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1592 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1593 fdq->d_fieldmask ^= FS_DQ_BHARD;
1594
1595 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1596 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1597 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1598
1599 if (fdq->d_fieldmask == 0)
1600 goto out_i;
1601
1602 offset = qd2offset(qd);
1603 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1604 if (gfs2_is_stuffed(ip))
1605 alloc_required = 1;
1606 if (alloc_required) {
1607 struct gfs2_alloc_parms ap = { .aflags = 0, };
1608 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1609 &data_blocks, &ind_blocks);
1610 blocks = 1 + data_blocks + ind_blocks;
1611 ap.target = blocks;
1612 error = gfs2_inplace_reserve(ip, &ap);
1613 if (error)
1614 goto out_i;
1615 blocks += gfs2_rg_blocks(ip, blocks);
1616 }
1617
1618 /* Some quotas span block boundaries and can update two blocks,
1619 adding an extra block to the transaction to handle such quotas */
1620 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1621 if (error)
1622 goto out_release;
1623
1624 /* Apply changes */
1625 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1626
1627 gfs2_trans_end(sdp);
1628 out_release:
1629 if (alloc_required)
1630 gfs2_inplace_release(ip);
1631 out_i:
1632 gfs2_glock_dq_uninit(&i_gh);
1633 out_q:
1634 gfs2_glock_dq_uninit(&q_gh);
1635 out_unlockput:
1636 mutex_unlock(&ip->i_inode.i_mutex);
1637 out_put:
1638 qd_put(qd);
1639 return error;
1640 }
1641
1642 const struct quotactl_ops gfs2_quotactl_ops = {
1643 .quota_sync = gfs2_quota_sync,
1644 .get_xstate = gfs2_quota_get_xstate,
1645 .get_dqblk = gfs2_get_dqblk,
1646 .set_dqblk = gfs2_set_dqblk,
1647 };
1648
1649 void __init gfs2_quota_hash_init(void)
1650 {
1651 unsigned i;
1652
1653 for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1654 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1655 }
Linux kernel - Deliverables
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